WO2024106361A1 - Drive device, and method for controlling cooling device - Google Patents

Drive device, and method for controlling cooling device Download PDF

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Publication number
WO2024106361A1
WO2024106361A1 PCT/JP2023/040689 JP2023040689W WO2024106361A1 WO 2024106361 A1 WO2024106361 A1 WO 2024106361A1 JP 2023040689 W JP2023040689 W JP 2023040689W WO 2024106361 A1 WO2024106361 A1 WO 2024106361A1
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WIPO (PCT)
Prior art keywords
command value
flow
temperature
motor
control
Prior art date
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PCT/JP2023/040689
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French (fr)
Japanese (ja)
Inventor
辰夫 細野
真二 久保
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ニデック株式会社
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Publication of WO2024106361A1 publication Critical patent/WO2024106361A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/60—Controlling or determining the temperature of the motor or of the drive
    • H02P29/62—Controlling or determining the temperature of the motor or of the drive for raising the temperature of the motor

Definitions

  • the present invention relates to a method for controlling a drive device and a cooling device.
  • Patent Document 1 describes a cooling circuit that uses an oil pump to supply oil to heat-generating parts of an electric motor.
  • the output of the cooling device may be controlled based on the temperature of the motor, and the amount of refrigerant sent to the motor may be controlled.
  • the output of the cooling device may be changed based on the temperature of the motor and when the refrigerant actually reaches the motor.
  • the motor may not be sufficiently cooled if, for example, the temperature of the motor rises suddenly.
  • one of the objects of the present invention is to provide a drive device that can prevent the cooling of a motor by a cooling device from becoming insufficient, and a control method for a cooling device that can prevent the cooling of a motor from becoming insufficient.
  • One embodiment of the drive device of the present invention includes a motor, a cooling device that sends a refrigerant to the motor, and a control device that controls the cooling device.
  • the control device is capable of executing flow control that controls the flow rate of the refrigerant sent from the cooling device to the motor based on the temperature of the motor and a torque command value of the motor.
  • the control device is capable of switching the flow command value input to the cooling device between a first flow command value that varies based on the temperature of the motor and a second flow command value that is equal to or greater than the first flow command value, and when the flow command value is the first flow command value, the control device switches the flow command value from the first flow command value to the second flow command value when the torque command value becomes equal to or greater than the first torque command value.
  • One aspect of the cooling device control method of the present invention is a method for controlling a cooling device that sends a refrigerant to a motor, and includes flow control for controlling the flow rate of the refrigerant sent from the cooling device to the motor based on the temperature of the motor and a torque command value of the motor.
  • the flow control includes switching the flow command value from the first flow command value to a second flow command value equal to or greater than the first flow command value when the flow command value input to the cooling device is a first flow command value that varies based on the temperature of the motor and the torque command value becomes equal to or greater than the first torque command value.
  • the cooling device it is possible to prevent the cooling device from insufficiently cooling the motor in the drive device.
  • FIG. 1 is a schematic diagram showing a schematic configuration of a drive device according to an embodiment.
  • FIG. 2 is a flowchart illustrating an example of a flow rate control procedure according to an embodiment.
  • FIG. 3 is a graph showing an example of the relationship between the first flow rate command value and the temperature of the motor in one embodiment.
  • FIG. 4 is a graph showing an example of changes over time of the torque command value, the flow command value, and the switching flag in the flow control of one embodiment.
  • the drive unit 100 of this embodiment shown in FIG. 1 is a drive unit that is mounted on a vehicle and rotates the vehicle's axle.
  • the drive unit 100 of this embodiment includes a drive unit main body 10, a cooling device 40, a cooler 50, a control device 60, and a temperature sensor 70.
  • the drive unit main body 10 has a housing 11, a motor 20, and a transmission device 30.
  • the drive unit 100 includes a housing 11, a motor 20, and a transmission device 30.
  • the housing 11 accommodates the motor 20 and the transmission device 30 inside.
  • the housing 11 has a storage section 12 in which oil O is stored as a refrigerant.
  • the storage section 12 is formed, for example, by a vertically lower portion of the housing 11 accommodation section in which the transmission device 30 is accommodated.
  • the oil O is used as a refrigerant to cool the motor 20.
  • the oil O is also used as a lubricant for the transmission device 30.
  • ATF Automatic Transmission Fluid
  • the motor 20 has a rotor 21 that can rotate around the central axis of the motor 20, and a stator 22 that faces the rotor 21 across a gap.
  • the rotor 21 has a shaft 21a that is connected to the transmission device 30.
  • the stator 22 has a coil 23.
  • the transmission device 30 is a device that transmits the rotation of the rotor 21 to the axle of the vehicle.
  • the transmission device 30 has a reduction gear 31 connected to the shaft 21a, and a differential gear 32 connected to the reduction gear 31.
  • the differential gear 32 is connected to the axle of the vehicle (not shown).
  • the differential gear 32 has a ring gear whose lower vertical end is immersed in the oil O stored in the storage section 12. As the ring gear rotates, a portion of the oil O in the storage section 12 is scooped up in the storage section of the housing 11 that houses the transmission device 30, and is supplied to the transmission device 30 as lubricating oil.
  • the cooling device 40 is a device that sends oil O as a refrigerant to the motor 20.
  • the cooling device 40 is a pump. More specifically, the cooling device 40 is an electric pump.
  • the cooling device 40 is attached to the housing 11.
  • the cooling device 40 has a pump drive unit 41, a pump mechanism unit 42, and a pump control unit 43.
  • the pump drive unit 41 is, for example, a motor controlled by the pump control unit 43.
  • the pump control unit 43 controls the pump drive unit 41 based on a flow command value FC input from the control device 60.
  • the pump mechanism 42 is driven by the pump drive unit 41 to send the oil O.
  • the pump mechanism 42 has, for example, an inner rotor rotated by the pump drive unit 41, and an outer rotor that surrounds the inner rotor and meshes with the inner rotor.
  • the pump mechanism 42 discharges the oil O drawn in from an intake port connected to the inside of the storage unit 12 to an outlet port connected to a flow path provided in the housing 11.
  • the oil O discharged by the pump mechanism 42 to the flow path flows through the flow path and is supplied to the motor 20.
  • the cooling device 40 sends the oil O as a refrigerant to the motor 20.
  • the cooling device 40 sends oil O to the rotor 21 and the stator 22.
  • the oil O sent to the motor 20 by the cooling device 40 accumulates, for example, in the housing 11, in the accommodating portion that accommodates the motor 20.
  • the oil O that accumulates in the housing 11, in the accommodating portion that accommodates the motor 20, returns to the reservoir 12 through a hole provided in the partition wall that separates the housing 11, in which the motor 20 is accommodated, from the accommodating portion of the transmission device 30.
  • the cooler 50 is attached to the housing 11.
  • the cooler 50 is provided midway through the flow path through which the oil O sent to the motor 20 flows.
  • the cooler 50 cools the oil O sent to the motor 20.
  • the oil O that flows from inside the reservoir 12 into the flow path of the housing 11 by the cooling device 40 is cooled by the cooler 50 before being supplied to the motor 20.
  • the oil O that flows into the cooler 50 is cooled by heat exchange with water W that flows into the drive unit 100 from the outside.
  • the water W that cools the oil O in the cooler 50 flows into the drive unit 100 from a radiator (not shown) mounted on the vehicle.
  • the water W that flows into the drive unit 100 passes through the control unit 60, cooling the control unit 60 before flowing into the cooler 50.
  • the temperature sensor 70 is a sensor capable of detecting the temperature Tm of the motor 20.
  • the temperature sensor 70 is attached to the coil 23 and detects the temperature of the coil 23.
  • the temperature Tm of the motor 20 detected by the temperature sensor 70 is the temperature of the coil 23.
  • the control device 60 controls the motor 20 and the cooling device 40.
  • the control device 60 has an inverter circuit that supplies a current Im to the motor 20.
  • the control device 60 controls the current Im supplied to the motor 20 based on a torque command value NC for the motor 20 input from a vehicle control unit ECU mounted on the vehicle. More specifically, the control device 60 controls the value of the current Im to a value at which the torque of the motor 20 becomes the torque command value NC input from the vehicle control unit ECU.
  • the current Im is supplied to the coil 23 of the motor 20.
  • the temperature Tm of the motor 20 detected by the temperature sensor 70 is input to the control device 60.
  • the rotation speed of the pump drive unit 41 may also be input to the control device 60 from the pump control unit 43 of the cooling device 40.
  • the control device 60 can execute flow control CF to control the cooling device 40.
  • the control method for the cooling device 40 includes flow control CF.
  • the flow control CF is a control that controls the flow rate of oil O, which serves as a refrigerant, sent from the cooling device 40 to the motor 20 based on the temperature Tm of the motor 20 and the torque command value NC of the motor 20.
  • the control device 60 always executes the flow control CF, for example, while the drive device 100 is being driven. Note that the control device 60 may not execute the flow control CF when a predetermined condition is satisfied, and may execute a control different from the flow control CF to control the cooling device 40 when the flow control CF is not executed.
  • the control device 60 controls the cooling device 40 according to the flowchart shown in FIG. 2.
  • the control device 60 first inputs a first flow command value FC1 to the cooling device 40 as a flow command value FC (step S1).
  • the first flow command value FC1 is a value that varies based on the temperature Tm of the motor 20.
  • the control device 60 varies the value of the first flow command value FC1 based on the temperature Tm of the motor 20 input from the temperature sensor 70.
  • FIG. 3 is a graph showing an example of the relationship between the first flow command value FC1 and the temperature Tm of the motor 20 in this embodiment.
  • the horizontal axis indicates the temperature Tm of the motor 20, and the vertical axis indicates the first flow command value FC1.
  • the first flow command value FC1 is constant at a value FCa.
  • the value FCa is the minimum value of the first flow command value FC1.
  • the temperature Ta is not particularly limited.
  • the temperature Ta is, for example, about 0° C. or more and 20° C. or less.
  • the value FCa, which is the minimum value of the first flow command value FC1 is not particularly limited.
  • the value FCa is, for example, about 1.0 [L/min] or more and 5.0 [L/min] or less.
  • the first flow command value FC1 is constant at the value FCb.
  • the temperature Tb is higher than the temperature Ta.
  • the temperature Tc is higher than the temperature Tb.
  • the value FCb is greater than the value FCa.
  • the first flow command value FC1 is constant at the value FCc.
  • the temperature Td is higher than the temperature Tc.
  • the temperature Te is higher than the temperature Td.
  • the value FCc is greater than the value FCb.
  • the first flow command value FC1 is constant at a value FCd.
  • the temperature Tf is higher than the temperature Te.
  • the temperature Tf corresponds to the "first temperature”.
  • the temperature Tf which is the first temperature, is not particularly limited.
  • the temperature Tf is, for example, equal to or higher than 80°C and equal to or lower than 120°C.
  • the value FCd is greater than the value FCc.
  • the value FCd is the maximum value of the first flow command value FC1.
  • the value FCd which is the maximum value of the first flow command value FC1, is not particularly limited.
  • the value FCd is, for example, equal to or higher than 8.0 [L/min] and equal to or lower than 12.0 [L/min].
  • the first flow command value FC1 changes linearly between the values FCa and FCb, and increases as the temperature Tm of the motor 20 increases.
  • the first flow command value FC1 changes linearly between the values FCb and FCc, and increases as the temperature Tm of the motor 20 increases.
  • the first flow command value FC1 changes linearly between the values FCc and FCd, and increases as the temperature Tm of the motor 20 increases.
  • the first flow command value FC1 when the temperature Tm of the motor 20 is lower than the temperature Tf is smaller than the first flow command value FC1 when the temperature Tm of the motor 20 is equal to or higher than the temperature Tf, i.e., the value FCd.
  • the control device 60 determines whether the torque command value NC is equal to or greater than the first torque command value NC1 (step S2).
  • the first torque command value NC1 is not particularly limited.
  • the first torque command value NC1 is a constant value.
  • the first torque command value NC1 is, for example, a torque command value NC that is relatively large.
  • the first torque command value NC1 is, for example, a value that is 50% or more and less than 100% of the maximum value of the torque command value NC. More preferably, the first torque command value NC1 is, for example, a value that is within a range of 60% or more and 90% or less of the maximum value of the torque command value NC.
  • step S2 If the torque command value NC is smaller than the first torque command value NC1 (step S2: NO), the control device 60 maintains the flow command value FC input to the cooling device 40 at the first flow command value FC1. On the other hand, if the torque command value NC is equal to or greater than the first torque command value NC1 (step S2: YES), the control device 60 inputs the second flow command value FC2 as the flow command value FC to the cooling device 40 (step S3). That is, in the flow control CF, when the flow command value FC is the first flow command value FC1, if the torque command value NC becomes equal to or greater than the first torque command value NC1, the control device 60 switches the flow command value FC from the first flow command value FC1 to the second flow command value FC2.
  • the flow control CF includes switching the flow command value FC from the first flow command value FC1 to the second flow command value FC2 when the torque command value NC becomes equal to or greater than the first torque command value NC1 when the flow command value FC input to the cooling device 40 is the first flow command value FC1.
  • the second flow command value FC2 is a value equal to or greater than the first flow command value FC1.
  • the second flow command value FC2 is a constant value.
  • the second flow command value FC2 is greater than the first flow command value FC1 when the temperature Tm of the motor 20 is lower than the temperature Tf.
  • the second flow command value FC2 is the same value as the first flow command value FC1 when the temperature Tm of the motor 20 is equal to or greater than the temperature Tf, and is the same value as the maximum value of the first flow command value FC1, i.e., value FCd.
  • the second flow command value FC2 is greater than the first flow command value FC1, except when the first flow command value FC1 is the maximum value.
  • the control device 60 determines whether the torque command value NC has been equal to or less than the second torque command value NC2 for a predetermined time Pt (step S4).
  • the second torque command value NC2 is a constant value.
  • the second torque command value NC2 is smaller than the first torque command value NC1.
  • the difference between the first torque command value NC1 and the second torque command value NC2 is relatively small.
  • the maximum value of the torque command value NC is 100%, the difference between the first torque command value NC1 and the second torque command value NC2 is, for example, about 3% or more and 10% or less.
  • the predetermined time Pt is, for example, about 5 seconds or more and 100 seconds or less.
  • the control device 60 starts counting the predetermined time Pt when the torque command value NC becomes equal to or less than the second torque command value NC2. If the torque command value NC becomes greater than the second torque command value NC2 before the predetermined time Pt has elapsed, the control device 60 stops counting the predetermined time Pt and returns the count to zero. If the torque command value NC becomes equal to or less than the second torque command value NC2 again, the control device 60 starts counting the predetermined time Pt again.
  • step S4 If the torque command value NC is equal to or less than the second torque command value NC2 and the predetermined time Pt has not elapsed continuously (step S4: NO), the control device 60 maintains the flow command value FC input to the cooling device 40 at the second flow command value FC2. On the other hand, if the torque command value NC is equal to or less than the second torque command value NC2 and the predetermined time Pt has elapsed continuously (step S4: YES), the control device 60 inputs the first flow command value FC1 as the flow command value FC to the cooling device 40 (step S1).
  • the control device 60 switches the flow command value FC from the second flow command value FC2 to the first flow command value FC1. More specifically, in the flow control CF, when the flow command value FC is the second flow command value FC2, if the state in which the torque command value NC is equal to or less than the second torque command value NC2 continues for a predetermined time Pt or more, the control device 60 switches the flow command value FC from the second flow command value FC2 to the first flow command value FC1.
  • the flow control CF includes switching the flow command value FC from the second flow command value FC2 to the first flow command value FC1 when the flow command value FC is the second flow command value FC2 and the torque command value NC is equal to or less than the second torque command value NC2. More specifically, the flow control CF includes switching the flow command value FC from the second flow command value FC2 to the first flow command value FC1 when the flow command value FC is the second flow command value FC2 and the state in which the torque command value NC is equal to or less than the second torque command value NC2 continues for a predetermined time Pt or more.
  • the control device 60 can switch the flow command value FC input to the cooling device 40 between a first flow command value FC1 that varies based on the temperature Tm of the motor 20, and a second flow command value FC2 that is equal to or greater than the first flow command value FC1.
  • the control device 60 repeatedly performs steps S1 to S4 described above to control the cooling device 40 based on the temperature Tm of the motor 20 and the torque command value NC, and controls the flow rate of oil O sent to the motor 20.
  • the control device 60 switches the flow command value FC between a first flow command value FC1 and a second flow command value FC2, for example, by switching the switching flag FL between 0 and 1.
  • the control device 60 sets the flow command value FC to the first flow command value FC1.
  • the control device 60 sets the flow command value FC to the second flow command value FC2.
  • the control device 60 switches the switching flag FL based on the torque command value NC, and switches the flow command value FC as described above.
  • FIG. 4 is a graph showing an example of the change over time of the torque command value NC, the flow command value FC, and the switching flag FL in the flow control CF.
  • Three graphs are shown arranged vertically in FIG. 4.
  • the top graph in FIG. 4 is a graph showing an example of the change over time of the torque command value NC.
  • the horizontal axis indicates time t
  • the vertical axis indicates the torque command value NC.
  • the center graph in FIG. 4 is a graph showing an example of the change over time of the flow command value FC.
  • the horizontal axis indicates time t
  • the vertical axis indicates the flow command value FC.
  • the bottom graph in FIG. 4 is a graph showing an example of the change over time of the switching flag FL.
  • the horizontal axis indicates time t
  • the vertical axis indicates the switching flag FL.
  • the torque command value NC is smaller than the first torque command value NC1, and the flow command value FC is the first flow command value FC1.
  • the switching flag FL is 0, and the value of the first flow command value FC1 is the value FCc.
  • the switching flag FL is switched to 1
  • the flow command value FC is switched to the second flow command value FC2.
  • the value of the second flow command value FC2 is constant at the value FCd, so that at time t1 the flow command value FC increases from the value FCc to the value FCd.
  • the control device 60 starts counting the predetermined time Pt. Note that there is a period of time after time t1 and before time t2 when the torque command value NC is smaller than the first torque command value NC1, but since the torque command value NC is greater than the second torque command value NC2 during this period, counting the predetermined time Pt does not start.
  • the torque command value NC remains equal to or less than the second torque command value NC2 and the predetermined time Pt has elapsed since time t2 at time t3, the switching flag FL becomes 0, and the flow command value FC is switched to the first flow command value FC1.
  • the first flow command value FC1 is equal to the value FCc. Between time t4 and time t5, the first flow command value FC1 decreases linearly from the value FCc to the value FCb. Between time t5 and time t6, the first flow command value FC1 is equal to the value FCb. In other words, between time t3 and time t6, the temperature Tm of the motor 20 decreases, and the first flow command value FC1 changes from the value FCc to the value FCb.
  • the flow command value FC fluctuates based on the temperature Tm of the motor 20, and when the torque command value NC becomes a relatively large value, i.e., equal to or greater than the first torque command value NC1, the flow command value FC is forcibly set to a large constant value, i.e., the second flow command value FC2.
  • the flow command value FC2 is the same value as the maximum value of the first flow command value FC1
  • the torque command value NC becomes equal to or greater than the first torque command value NC1
  • the flow command value FC is forcibly set to the same value as the maximum value of the first flow command value FC1, which fluctuates based on the temperature Tm of the motor 20.
  • the control device 60 switches the flow command value FC from the first flow command value FC1, which varies based on the temperature Tm of the motor 20, to a second flow command value FC2 equal to or greater than the first flow command value FC1. Therefore, when the torque command value NC becomes equal to or greater than the first torque command value NC1, the flow command value FC input to the cooling device 40 can be set to the second flow command value FC2 equal to or greater than the first flow command value FC1 based on the temperature Tm of the motor 20, regardless of the temperature Tm of the motor 20.
  • the control device 60 varies the amount of oil O sent from the cooling device 40 to the motor 20 based on the temperature Tm of the motor 20. Therefore, when the torque command value NC is relatively small and the temperature Tm of the motor 20 is unlikely to rise suddenly, it is possible to prevent the amount of oil O sent from the cooling device 40 to the motor 20 from becoming unnecessarily large. Therefore, it is possible to prevent an increase in the power consumed by the cooling device 40, and to prevent an increase in the power consumed by the drive device 100.
  • the torque command value NC becomes larger than during normal driving, and the temperature Tm of the motor 20 is likely to rise sharply.
  • the flow rate of oil O sent from the cooling device 40 is controlled based only on the temperature Tm of the motor 20, the increase in the flow rate of oil O will not be able to keep up, as described above, and the cooling of the motor 20 will likely not be able to keep up.
  • the cooling device 40 is controlled based not only on the temperature Tm of the motor 20 but also on the torque command value NC, so that when the driver depresses the accelerator pedal deeply and the torque command value NC becomes larger than during normal driving, the flow rate of oil O can be forcibly increased regardless of the temperature Tm of the motor 20, and it is possible to prevent the cooling of the motor 20 from not being able to keep up.
  • the control device 60 switches the flow command value FC from the second flow command value FC2 to the first flow command value FC1. Therefore, when the torque command value NC becomes small and it is no longer necessary to forcibly increase the flow rate of the oil O sent to the motor 20, the control can be returned to one in which the flow rate of the oil O sent to the motor 20 varies based on the temperature Tm of the motor 20. This can further prevent the amount of oil O sent from the cooling device 40 to the motor 20 from becoming unnecessarily large. Therefore, it can further prevent the power consumed by the cooling device 40 from increasing, and can further prevent the power consumed by the drive device 100 from increasing.
  • the second torque command value NC2 is smaller than the first torque command value NC1. Therefore, for example, even if the torque command value NC is unstable and repeatedly rises and falls near the first torque command value NC1 after the torque command value NC becomes equal to or greater than the first torque command value NC1 and the flow command value FC becomes the second flow command value FC2, the flow command value FC will not be switched unless the torque command value NC becomes equal to or less than the second torque command value NC2. This makes it possible to prevent the flow command value FC from being frequently switched between the first flow command value FC1 and the second flow command value FC2 within a short period of time. Therefore, it is possible to prevent a load from being applied to the cooling device 40.
  • the control device 60 switches the flow command value FC from the second flow command value FC2 to the first flow command value FC1. Therefore, even if the torque command value NC becomes equal to or less than the second torque command value NC2, the flow command value FC does not immediately switch to the first flow command value FC1.
  • the torque command value NC may repeatedly change between a value equal to or greater than the first torque command value NC1 and a value equal to or less than the second torque command value NC2 in a short period of time.
  • the flow command value FC is immediately returned to the first flow command value FC1 when the torque command value NC becomes equal to or less than the second torque command value NC2
  • the flow command value FC will be frequently switched between the first flow command value FC1 and the second flow command value FC2 in a short period of time.
  • the flow command value FC will not return to the first flow command value FC1 until a predetermined time Pt has elapsed. Therefore, for example, when the accelerator pedal is repeatedly depressing the accelerator pedal heavily in a short period of time, it is possible to maintain the flow command value FC at the second flow command value FC2. This makes it possible to prevent the flow command value FC from being frequently switched between the first flow command value FC1 and the second flow command value FC2 in a short period of time. Therefore, it is possible to further prevent the load on the cooling device 40.
  • the second flow command value FC2 is greater than the first flow command value FC1 when the temperature Tm of the motor 20 is lower than the temperature Tf. Therefore, when the flow command value FC is switched from the first flow command value FC1 to the second flow command value FC2, it is easy to suitably increase the flow rate of the oil O sent to the motor 20.
  • the second flow command value FC2 is the same value as the first flow command value FC1 when the temperature Tm of the motor 20 is equal to or higher than the first temperature Tf, and is the same value as the maximum value of the first flow command value FC1. Therefore, when the flow command value FC is switched to the second flow command value FC2, the flow rate of the oil O sent from the cooling device 40 to the motor 20 can be set to the same flow rate as the maximum flow rate based on the first flow command value FC1. Therefore, when the flow command value FC is switched to the second flow command value FC2, the flow rate of the oil O sent to the motor 20 can be more suitably increased.
  • the control device 60 executes the above-described flow control CF when the temperature Tm of the motor 20 is equal to or higher than the temperature Tg.
  • the temperature Tg corresponds to a second temperature lower than the temperature Tf, which is the first temperature. As shown in FIG. 3, the temperature Tg is lower than the temperature Ta.
  • the temperature Tg is not particularly limited.
  • the temperature Tg is, for example, about ⁇ 40° C. or higher and ⁇ 20° C. or lower.
  • the first flow command value FC1 is the value FCa, so that even when the temperature Tm of the motor 20 is equal to or lower than the temperature Tg, the first flow command value FC1 is the value FCa.
  • the first flow command value FC1 is the minimum value of the first flow command value FC1.
  • the temperature Tm of the motor 20 is sufficiently low, even if the torque command value NC increases to a certain extent, the temperature Tm of the motor 20 is unlikely to rise, or is unlikely to rise to a temperature that causes problems. Therefore, when the temperature Tm of the motor 20 is sufficiently low, even if the torque command value NC increases to a certain extent, there may be cases where it is not necessary to forcibly increase the flow rate of the oil O. Therefore, by executing the flow rate control CF when the temperature Tm of the motor 20 is equal to or higher than the temperature Tg, and not executing the flow rate control CF when the temperature Tm of the motor 20 is lower than the temperature Tg, it is possible to prevent the flow rate of the oil O from increasing unnecessarily. This makes it possible to further prevent an increase in the power consumed by the cooling device 40, and to further prevent an increase in the power consumed by the drive device 100.
  • the first flow command value FC1 when the temperature Tm of the motor 20 is lower than the second temperature Tg is the minimum value of the first flow command value FC1.
  • the temperature Tm of the motor 20 is lower than the temperature Tg, the amount of oil O that needs to be supplied to the motor 20 is small. Therefore, in the range in which the temperature Tm of the motor 20 is lower than the temperature Tg, the cooling of the motor 20 is unlikely to be insufficient even if the flow control CF is not executed. Therefore, by executing the flow control CF when the temperature Tm of the motor 20 is equal to or higher than the temperature Tg, the flow control CF can be executed more suitably within the required range.
  • the control device may have any configuration and may be capable of performing any type of control, so long as it is a device that controls the cooling device and is capable of performing flow control to control the flow rate of refrigerant sent from the cooling device to the motor based on the motor temperature and the motor torque command value.
  • the control device does not have to control the motor.
  • a device that controls the motor may be provided separately from a control device that is capable of performing flow control and controls the cooling device.
  • the control device may be provided integrally with the cooling device.
  • the control device may be capable of executing other control that controls the flow rate of the refrigerant sent from the cooling device to the motor, which is different from the flow rate control that controls the flow rate of the refrigerant based on the motor temperature and torque command value.
  • the other control may be control of the flow rate of the refrigerant based only on the motor temperature, or may be control of the flow rate of the refrigerant based on other parameters.
  • the control device may decide based on what conditions whether or not to execute flow rate control.
  • the flow control controls the flow rate of the refrigerant based on the motor temperature and the motor torque command value
  • the flow control includes at least a calculation that uses the motor temperature as a parameter and a calculation that uses the motor torque command value as a parameter.
  • the flow control that controls the flow rate of the refrigerant based on the motor temperature and the motor torque command value may be any type of control as long as, when the flow rate command value is the first flow rate command value, the flow rate command value can be switched from the first flow rate command value to the second flow rate command value when the torque command value becomes equal to or greater than the first torque command value.
  • the flow rate control may be a control that immediately switches the flow rate command value to the first flow rate command value when the flow rate command value is the second flow rate command value and the torque command value becomes equal to or less than the second torque command value.
  • the second torque command value may be the same value as the first torque command value.
  • the flow control may be a control in which, when the flow command value is the second flow command value, the flow command value is switched to the first flow command value based on a parameter other than the torque command value.
  • the flow control may be a control in which, after the flow command value is switched to the second flow command value, the flow command value is switched to the first flow command value based on the temperature of the motor.
  • the control device may switch the flow command value from the second flow command value to the first flow command value when the temperature of the motor is equal to or lower than a predetermined temperature when the flow command value is the second flow command value.
  • the flow control may be a control in which, after the flow command value is switched to the second flow command value, the control device may switch the flow command value to the first flow command value based on both the temperature of the motor and the torque command value of the motor.
  • the control device may switch the flow command value from the second flow command value to the first flow command value when the temperature of the motor is equal to or lower than a predetermined temperature and the torque command value is equal to or lower than a predetermined value when the flow command value is the second flow command value.
  • the first flow command value may vary in any manner based on the temperature of the motor.
  • the second flow command value may be any value equal to or greater than the first flow command value.
  • the second flow command value may be greater than the maximum value of the first flow command value.
  • the second flow command value may not be a constant value, but may be a variable value. In this case, in flow control, when the flow command value is the second flow command value, the control device may vary the second flow command value based on the temperature of the motor.
  • Each control, including the flow control, performed by the control device described above may be control realized by hardware including digital circuits and analog circuits, or may be control realized by software, i.e., control realized by the control device executing a program, or may be control realized by hardware and software.
  • the cooling device may be any device that sends a refrigerant to the motor.
  • the refrigerant sent to the motor by the cooling device may be any type of refrigerant.
  • the refrigerant does not have to be oil and may be water.
  • the drive unit to which the present invention is applied is not particularly limited.
  • the drive unit may be mounted on a vehicle for a purpose other than rotating an axle, or may be mounted on equipment other than a vehicle.
  • the present technology may be configured as follows: (1) A drive device including a motor, a cooling device that sends a refrigerant to the motor, and a control device that controls the cooling device, the control device being capable of executing flow control for controlling a flow rate of the refrigerant sent from the cooling device to the motor based on a temperature of the motor and a torque command value of the motor, the control device being capable of switching a flow command value input to the cooling device between a first flow command value that varies based on the temperature of the motor and a second flow command value that is equal to or greater than the first flow command value in the flow control, and switching the flow command value from the first flow command value to the second flow command value when the torque command value becomes equal to or greater than the first torque command value when the flow command value is the first flow command value.
  • a control method for a cooling device that supplies a refrigerant to a motor comprising flow rate control for controlling a flow rate of the refrigerant sent from the cooling device to the motor based on a temperature of the motor and a torque command value of the motor, the flow rate control comprising, when a flow rate command value input to the cooling device is a first flow rate command value that varies based on the temperature of the motor, switching the flow rate command value from the first flow rate command value to a second flow rate command value that is equal to or greater than the first flow rate command value when the torque command value becomes equal to or greater than the first torque command value.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

This drive device is equipped with a motor, a cooling device for sending a coolant to the motor, and a control device for controlling the cooling device. The control device is capable of executing a flow control for controlling the flow of the coolant delivered to the motor from the cooling device on the basis of the temperature of the motor and a torque command value of the motor. During the flow control, the control device is capable of switching a flow command value to be inputted into the cooling device between a first flow command value which changes on the basis of the motor temperature and a second flow command value which is greater than or equal to the first flow command value, and when the flow command value is the first flow command value, switches the flow command value from the first flow command value to the second flow command value if the torque command value is greater than or equal to the first torque command value.

Description

駆動装置、および冷却装置の制御方法Drive device and cooling device control method
　本発明は、駆動装置、および冷却装置の制御方法に関する。 The present invention relates to a method for controlling a drive device and a cooling device.
　モータに冷媒を送る冷却装置が知られている。例えば、特許文献１には、オイルポンプによってオイルを電動モータの発熱部に供給する冷却回路が記載されている。 Cooling devices that send refrigerant to a motor are known. For example, Patent Document 1 describes a cooling circuit that uses an oil pump to supply oil to heat-generating parts of an electric motor.
特表２０１８－５３７９３３号公報JP 2018-537933 A
　上記のような冷却装置においては、モータの温度に基づいて冷却装置の出力が制御され、モータに送られる冷媒の量が制御される場合がある。しかしながら、冷却装置の出力がモータの温度に基づいて変更されてから、実際に冷媒がモータに到達するまでには時間差が生じる場合がある。そのため、例えばモータの温度が急上昇する場合などに、モータの冷却が不十分となる恐れがあった。 In cooling devices such as those described above, the output of the cooling device may be controlled based on the temperature of the motor, and the amount of refrigerant sent to the motor may be controlled. However, there may be a time lag between when the output of the cooling device is changed based on the temperature of the motor and when the refrigerant actually reaches the motor. As a result, there is a risk that the motor may not be sufficiently cooled if, for example, the temperature of the motor rises suddenly.
　本発明は、上記事情に鑑みて、冷却装置によるモータの冷却が不十分となることを抑制できる駆動装置、およびモータの冷却が不十分となることを抑制できる冷却装置の制御方法を提供することを目的の一つとする。 In view of the above circumstances, one of the objects of the present invention is to provide a drive device that can prevent the cooling of a motor by a cooling device from becoming insufficient, and a control method for a cooling device that can prevent the cooling of a motor from becoming insufficient.
　本発明の駆動装置の一つの態様は、モータと、前記モータに冷媒を送る冷却装置と、前記冷却装置を制御する制御装置と、を備える。前記制御装置は、前記モータの温度および前記モータのトルク指令値に基づいて前記冷却装置から前記モータに送られる前記冷媒の流量を制御する流量制御を実行可能である。前記流量制御において前記制御装置は、前記冷却装置に入力する流量指令値を、前記モータの温度に基づいて変動する第１流量指令値と、前記第１流量指令値以上の第２流量指令値と、に切り替え可能であり、かつ、前記流量指令値が前記第１流量指令値である場合において、前記トルク指令値が第１トルク指令値以上となった場合に、前記流量指令値を前記第１流量指令値から前記第２流量指令値に切り替える。 One embodiment of the drive device of the present invention includes a motor, a cooling device that sends a refrigerant to the motor, and a control device that controls the cooling device. The control device is capable of executing flow control that controls the flow rate of the refrigerant sent from the cooling device to the motor based on the temperature of the motor and a torque command value of the motor. In the flow control, the control device is capable of switching the flow command value input to the cooling device between a first flow command value that varies based on the temperature of the motor and a second flow command value that is equal to or greater than the first flow command value, and when the flow command value is the first flow command value, the control device switches the flow command value from the first flow command value to the second flow command value when the torque command value becomes equal to or greater than the first torque command value.
　本発明の冷却装置の制御方法の一つの態様は、モータに冷媒を送る冷却装置の制御方法であって、前記モータの温度および前記モータのトルク指令値に基づいて前記冷却装置から前記モータに送られる前記冷媒の流量を制御する流量制御を含む。前記流量制御は、前記冷却装置に入力する流量指令値が前記モータの温度に基づいて変動する第１流量指令値である場合において、前記トルク指令値が第１トルク指令値以上となった場合に、前記流量指令値を前記第１流量指令値から前記第１流量指令値以上の第２流量指令値に切り替えることを含む。 One aspect of the cooling device control method of the present invention is a method for controlling a cooling device that sends a refrigerant to a motor, and includes flow control for controlling the flow rate of the refrigerant sent from the cooling device to the motor based on the temperature of the motor and a torque command value of the motor. The flow control includes switching the flow command value from the first flow command value to a second flow command value equal to or greater than the first flow command value when the flow command value input to the cooling device is a first flow command value that varies based on the temperature of the motor and the torque command value becomes equal to or greater than the first torque command value.
　本発明の一つの態様によれば、駆動装置において、冷却装置によるモータの冷却が不十分となることを抑制できる。 According to one aspect of the present invention, it is possible to prevent the cooling device from insufficiently cooling the motor in the drive device.
図１は、一実施形態における駆動装置の概略構成を示す模式図である。FIG. 1 is a schematic diagram showing a schematic configuration of a drive device according to an embodiment. 図２は、一実施形態における流量制御の手順の一例を示すフローチャートである。FIG. 2 is a flowchart illustrating an example of a flow rate control procedure according to an embodiment. 図３は、一実施形態における第１流量指令値とモータの温度との関係の一例を示すグラフである。FIG. 3 is a graph showing an example of the relationship between the first flow rate command value and the temperature of the motor in one embodiment. 図４は、一実施形態の流量制御におけるトルク指令値、流量指令値、および切替フラグのそれぞれの時間変化の一例を示すグラフである。FIG. 4 is a graph showing an example of changes over time of the torque command value, the flow command value, and the switching flag in the flow control of one embodiment.
　図１に示す本実施形態の駆動装置１００は、車両に搭載され、車両の車軸を回転させる駆動装置である。図１に示すように、本実施形態の駆動装置１００は、駆動装置本体１０と、冷却装置４０と、クーラ５０と、制御装置６０と、温度センサ７０と、を備える。駆動装置本体１０は、ハウジング１１と、モータ２０と、伝達装置３０と、を有する。つまり、駆動装置１００は、ハウジング１１と、モータ２０と、伝達装置３０と、を備える。 The drive unit 100 of this embodiment shown in FIG. 1 is a drive unit that is mounted on a vehicle and rotates the vehicle's axle. As shown in FIG. 1, the drive unit 100 of this embodiment includes a drive unit main body 10, a cooling device 40, a cooler 50, a control device 60, and a temperature sensor 70. The drive unit main body 10 has a housing 11, a motor 20, and a transmission device 30. In other words, the drive unit 100 includes a housing 11, a motor 20, and a transmission device 30.
　ハウジング１１は、モータ２０および伝達装置３０を内部に収容している。ハウジング１１は、冷媒としてのオイルＯが貯留される貯留部１２を有する。貯留部１２は、例えば、ハウジング１１のうち伝達装置３０が収容される収容部の鉛直方向下側の部分によって構成されている。オイルＯは、モータ２０を冷却する冷媒として使用される。また、オイルＯは、伝達装置３０に対して潤滑油として使用される。オイルＯとしては、例えば、冷媒および潤滑油の機能を奏するために、比較的粘度の低いオートマチックトランスミッション用潤滑油（ＡＴＦ：Automatic Transmission Fluid）と同等のオイルを用いることが好ましい。 The housing 11 accommodates the motor 20 and the transmission device 30 inside. The housing 11 has a storage section 12 in which oil O is stored as a refrigerant. The storage section 12 is formed, for example, by a vertically lower portion of the housing 11 accommodation section in which the transmission device 30 is accommodated. The oil O is used as a refrigerant to cool the motor 20. The oil O is also used as a lubricant for the transmission device 30. For example, it is preferable to use an oil equivalent to an automatic transmission lubricant (ATF: Automatic Transmission Fluid) with a relatively low viscosity as the oil O in order to perform the functions of refrigerant and lubricant.
　モータ２０は、モータ２０の中心軸を中心として回転可能なロータ２１と、ロータ２１と隙間を介して対向するステータ２２と、を有する。ロータ２１は、伝達装置３０に接続されたシャフト２１ａを有する。ステータ２２は、コイル２３を有する。 The motor 20 has a rotor 21 that can rotate around the central axis of the motor 20, and a stator 22 that faces the rotor 21 across a gap. The rotor 21 has a shaft 21a that is connected to the transmission device 30. The stator 22 has a coil 23.
　伝達装置３０は、ロータ２１の回転を車両の車軸に伝達する装置である。伝達装置３０は、シャフト２１ａに接続された減速装置３１と、減速装置３１に接続された差動装置３２と、を有する。差動装置３２は、図示しない車両の車軸に接続されている。図示は省略するが、差動装置３２は、鉛直方向下側の端部が貯留部１２に貯留されたオイルＯに浸漬されるリングギヤを有する。当該リングギヤが回転することで、ハウジング１１のうち伝達装置３０が収容された収容部内において、貯留部１２内のオイルＯの一部がかき上げられて、伝達装置３０に潤滑油として供給される。 The transmission device 30 is a device that transmits the rotation of the rotor 21 to the axle of the vehicle. The transmission device 30 has a reduction gear 31 connected to the shaft 21a, and a differential gear 32 connected to the reduction gear 31. The differential gear 32 is connected to the axle of the vehicle (not shown). Although not shown, the differential gear 32 has a ring gear whose lower vertical end is immersed in the oil O stored in the storage section 12. As the ring gear rotates, a portion of the oil O in the storage section 12 is scooped up in the storage section of the housing 11 that houses the transmission device 30, and is supplied to the transmission device 30 as lubricating oil.
　冷却装置４０は、モータ２０に冷媒としてのオイルＯを送る装置である。本実施形態において冷却装置４０は、ポンプである。より詳細には、冷却装置４０は、電動ポンプである。冷却装置４０は、ハウジング１１に取り付けられている。冷却装置４０は、ポンプ駆動部４１と、ポンプ機構部４２と、ポンプ制御部４３と、を有する。ポンプ駆動部４１は、例えば、ポンプ制御部４３によって制御されるモータである。ポンプ制御部４３は、制御装置６０から入力される流量指令値ＦＣに基づいて、ポンプ駆動部４１を制御する。 The cooling device 40 is a device that sends oil O as a refrigerant to the motor 20. In this embodiment, the cooling device 40 is a pump. More specifically, the cooling device 40 is an electric pump. The cooling device 40 is attached to the housing 11. The cooling device 40 has a pump drive unit 41, a pump mechanism unit 42, and a pump control unit 43. The pump drive unit 41 is, for example, a motor controlled by the pump control unit 43. The pump control unit 43 controls the pump drive unit 41 based on a flow command value FC input from the control device 60.
　ポンプ機構部４２は、ポンプ駆動部４１によって駆動されてオイルＯを送る。ポンプ機構部４２は、例えば、ポンプ駆動部４１によって回転させられるインナーロータと、インナーロータを囲みインナーロータと噛み合うアウターロータと、を有する。本実施形態においてポンプ機構部４２は、貯留部１２の内部に繋がる吸入口から吸入されたオイルＯを、ハウジング１１に設けられた流路部に繋がる吐出口へと吐出する。ポンプ機構部４２によって当該流路部に吐出されたオイルＯは、当該流路部内を流れて、モータ２０に供給される。このようにして、冷却装置４０は、モータ２０に冷媒としてのオイルＯを送る。 The pump mechanism 42 is driven by the pump drive unit 41 to send the oil O. The pump mechanism 42 has, for example, an inner rotor rotated by the pump drive unit 41, and an outer rotor that surrounds the inner rotor and meshes with the inner rotor. In this embodiment, the pump mechanism 42 discharges the oil O drawn in from an intake port connected to the inside of the storage unit 12 to an outlet port connected to a flow path provided in the housing 11. The oil O discharged by the pump mechanism 42 to the flow path flows through the flow path and is supplied to the motor 20. In this way, the cooling device 40 sends the oil O as a refrigerant to the motor 20.
　本実施形態において冷却装置４０は、ロータ２１およびステータ２２にオイルＯに送る。冷却装置４０によってモータ２０に送られたオイルＯは、例えば、ハウジング１１のうちモータ２０を収容する収容部内に溜まる。ハウジング１１のうちモータ２０を収容する収容部内に溜まったオイルＯは、ハウジング１１のうちモータ２０の収容部と伝達装置３０の収容部とを隔てる隔壁部に設けられた孔を介して、貯留部１２内へと戻る。 In this embodiment, the cooling device 40 sends oil O to the rotor 21 and the stator 22. The oil O sent to the motor 20 by the cooling device 40 accumulates, for example, in the housing 11, in the accommodating portion that accommodates the motor 20. The oil O that accumulates in the housing 11, in the accommodating portion that accommodates the motor 20, returns to the reservoir 12 through a hole provided in the partition wall that separates the housing 11, in which the motor 20 is accommodated, from the accommodating portion of the transmission device 30.
　クーラ５０は、ハウジング１１に取り付けられている。クーラ５０は、モータ２０に送られるオイルＯが流れる流路部の途中に設けられている。クーラ５０は、モータ２０に送られるオイルＯを冷却する。つまり、冷却装置４０によって貯留部１２内からハウジング１１の流路部に流入したオイルＯは、クーラ５０によって冷却されてからモータ２０へと供給される。 The cooler 50 is attached to the housing 11. The cooler 50 is provided midway through the flow path through which the oil O sent to the motor 20 flows. The cooler 50 cools the oil O sent to the motor 20. In other words, the oil O that flows from inside the reservoir 12 into the flow path of the housing 11 by the cooling device 40 is cooled by the cooler 50 before being supplied to the motor 20.
　クーラ５０内に流入したオイルＯは、外部から駆動装置１００内に流入した水Ｗとの熱交換によって冷却される。クーラ５０においてオイルＯを冷却する水Ｗは、車両に搭載された図示しないラジエータから駆動装置１００内に流入する。駆動装置１００内に流入した水Ｗは、制御装置６０内を通って制御装置６０を冷却してからクーラ５０に流入する。クーラ５０内に流入した水Ｗは、オイルＯから熱を奪った後に、駆動装置１００の外部に排出され、図示しないラジエータで冷却されてから再び駆動装置１００内に流入する。 The oil O that flows into the cooler 50 is cooled by heat exchange with water W that flows into the drive unit 100 from the outside. The water W that cools the oil O in the cooler 50 flows into the drive unit 100 from a radiator (not shown) mounted on the vehicle. The water W that flows into the drive unit 100 passes through the control unit 60, cooling the control unit 60 before flowing into the cooler 50. After the water W that flows into the cooler 50 removes heat from the oil O, it is discharged outside the drive unit 100, is cooled by a radiator (not shown), and then flows back into the drive unit 100.
　温度センサ７０は、モータ２０の温度Ｔｍを検出可能なセンサである。本実施形態において温度センサ７０は、コイル２３に取り付けられ、コイル２３の温度を検出する。つまり、本実施形態において温度センサ７０によって検出されるモータ２０の温度Ｔｍは、コイル２３の温度である。 The temperature sensor 70 is a sensor capable of detecting the temperature Tm of the motor 20. In this embodiment, the temperature sensor 70 is attached to the coil 23 and detects the temperature of the coil 23. In other words, in this embodiment, the temperature Tm of the motor 20 detected by the temperature sensor 70 is the temperature of the coil 23.
　制御装置６０は、モータ２０および冷却装置４０を制御する。制御装置６０は、モータ２０に電流Ｉｍを供給するインバータ回路を有する。制御装置６０は、車両に搭載された車両制御部ＥＣＵから入力されるモータ２０のトルク指令値ＮＣに基づいて、モータ２０に供給する電流Ｉｍを制御する。より具体的には、制御装置６０は、電流Ｉｍの値を、モータ２０のトルクが車両制御部ＥＣＵから入力されるトルク指令値ＮＣとなる値に制御する。電流Ｉｍは、モータ２０のコイル２３に供給される。制御装置６０には、温度センサ７０によって検出されたモータ２０の温度Ｔｍが入力される。なお、制御装置６０には、冷却装置４０のポンプ制御部４３からポンプ駆動部４１の回転速度などが入力されてもよい。 The control device 60 controls the motor 20 and the cooling device 40. The control device 60 has an inverter circuit that supplies a current Im to the motor 20. The control device 60 controls the current Im supplied to the motor 20 based on a torque command value NC for the motor 20 input from a vehicle control unit ECU mounted on the vehicle. More specifically, the control device 60 controls the value of the current Im to a value at which the torque of the motor 20 becomes the torque command value NC input from the vehicle control unit ECU. The current Im is supplied to the coil 23 of the motor 20. The temperature Tm of the motor 20 detected by the temperature sensor 70 is input to the control device 60. The rotation speed of the pump drive unit 41 may also be input to the control device 60 from the pump control unit 43 of the cooling device 40.
　制御装置６０は、冷却装置４０を制御する流量制御ＣＦを実行可能である。つまり、冷却装置４０の制御方法は、流量制御ＣＦを含む。流量制御ＣＦは、モータ２０の温度Ｔｍおよびモータ２０のトルク指令値ＮＣに基づいて冷却装置４０からモータ２０に送られる冷媒としてのオイルＯの流量を制御する制御である。制御装置６０は、例えば、駆動装置１００が駆動されている間、常に流量制御ＣＦを実行する。なお、制御装置６０は、所定の条件を満たす場合に流量制御ＣＦを実行しないことがあってもよく、流量制御ＣＦを実行しない場合に流量制御ＣＦとは異なる制御を実行して冷却装置４０を制御してもよい。 The control device 60 can execute flow control CF to control the cooling device 40. In other words, the control method for the cooling device 40 includes flow control CF. The flow control CF is a control that controls the flow rate of oil O, which serves as a refrigerant, sent from the cooling device 40 to the motor 20 based on the temperature Tm of the motor 20 and the torque command value NC of the motor 20. The control device 60 always executes the flow control CF, for example, while the drive device 100 is being driven. Note that the control device 60 may not execute the flow control CF when a predetermined condition is satisfied, and may execute a control different from the flow control CF to control the cooling device 40 when the flow control CF is not executed.
　本実施形態の流量制御ＣＦにおいて制御装置６０は、図２に示すフローチャートに沿って冷却装置４０を制御する。図２に示すように、流量制御ＣＦにおいて制御装置６０は、まず、流量指令値ＦＣとして第１流量指令値ＦＣ１を冷却装置４０に入力する（ステップＳ１）。第１流量指令値ＦＣ１は、モータ２０の温度Ｔｍに基づいて変動する値である。流量制御ＣＦにおいて制御装置６０は、温度センサ７０から入力されるモータ２０の温度Ｔｍに基づいて第１流量指令値ＦＣ１の値を変動させる。 In the flow control CF of this embodiment, the control device 60 controls the cooling device 40 according to the flowchart shown in FIG. 2. As shown in FIG. 2, in the flow control CF, the control device 60 first inputs a first flow command value FC1 to the cooling device 40 as a flow command value FC (step S1). The first flow command value FC1 is a value that varies based on the temperature Tm of the motor 20. In the flow control CF, the control device 60 varies the value of the first flow command value FC1 based on the temperature Tm of the motor 20 input from the temperature sensor 70.
　図３は、本実施形態における第１流量指令値ＦＣ１とモータ２０の温度Ｔｍとの関係の一例を示すグラフである。図３において、横軸はモータ２０の温度Ｔｍを示し、縦軸は第１流量指令値ＦＣ１を示している。図３に示すように、本実施形態においてモータ２０の温度Ｔｍが温度Ｔａよりも低い場合、第１流量指令値ＦＣ１は、値ＦＣａで一定である。本実施形態において値ＦＣａは、第１流量指令値ＦＣ１の最小値である。温度Ｔａは、特に限定されない。温度Ｔａは、例えば、０℃以上、２０℃以下程度である。第１流量指令値ＦＣ１の最小値である値ＦＣａは、特に限定されない。値ＦＣａは、例えば、１．０［Ｌ／ｍｉｎ］以上、５．０［Ｌ／ｍｉｎ］以下程度である。 FIG. 3 is a graph showing an example of the relationship between the first flow command value FC1 and the temperature Tm of the motor 20 in this embodiment. In FIG. 3, the horizontal axis indicates the temperature Tm of the motor 20, and the vertical axis indicates the first flow command value FC1. As shown in FIG. 3, in this embodiment, when the temperature Tm of the motor 20 is lower than the temperature Ta, the first flow command value FC1 is constant at a value FCa. In this embodiment, the value FCa is the minimum value of the first flow command value FC1. The temperature Ta is not particularly limited. The temperature Ta is, for example, about 0° C. or more and 20° C. or less. The value FCa, which is the minimum value of the first flow command value FC1, is not particularly limited. The value FCa is, for example, about 1.0 [L/min] or more and 5.0 [L/min] or less.
　モータ２０の温度Ｔｍが温度Ｔｂ以上で、かつ、温度Ｔｃよりも低い場合、第１流量指令値ＦＣ１は、値ＦＣｂで一定である。温度Ｔｂは、温度Ｔａよりも高い。温度Ｔｃは、温度Ｔｂよりも高い。値ＦＣｂは、値ＦＣａよりも大きい。モータ２０の温度Ｔｍが温度Ｔｄ以上で、かつ、温度Ｔｅよりも低い場合、第１流量指令値ＦＣ１は、値ＦＣｃで一定である。温度Ｔｄは、温度Ｔｃよりも高い。温度Ｔｅは、温度Ｔｄよりも高い。値ＦＣｃは、値ＦＣｂよりも大きい。 When the temperature Tm of the motor 20 is equal to or higher than the temperature Tb and lower than the temperature Tc, the first flow command value FC1 is constant at the value FCb. The temperature Tb is higher than the temperature Ta. The temperature Tc is higher than the temperature Tb. The value FCb is greater than the value FCa. When the temperature Tm of the motor 20 is equal to or higher than the temperature Td and lower than the temperature Te, the first flow command value FC1 is constant at the value FCc. The temperature Td is higher than the temperature Tc. The temperature Te is higher than the temperature Td. The value FCc is greater than the value FCb.
　モータ２０の温度Ｔｍが温度Ｔｆ以上の場合、第１流量指令値ＦＣ１は、値ＦＣｄで一定である。温度Ｔｆは、温度Ｔｅよりも高い。本実施形態において温度Ｔｆは、「第１温度」に相当する。第１温度である温度Ｔｆは、特に限定されない。温度Ｔｆは、例えば、８０℃以上、１２０℃以下程度である。値ＦＣｄは、値ＦＣｃよりも大きい。本実施形態において値ＦＣｄは、第１流量指令値ＦＣ１の最大値である。第１流量指令値ＦＣ１の最大値である値ＦＣｄは、特に限定されない。値ＦＣｄは、例えば、８．０［Ｌ／ｍｉｎ］以上、１２．０［Ｌ／ｍｉｎ］以下程度である。 When the temperature Tm of the motor 20 is equal to or higher than the temperature Tf, the first flow command value FC1 is constant at a value FCd. The temperature Tf is higher than the temperature Te. In this embodiment, the temperature Tf corresponds to the "first temperature". The temperature Tf, which is the first temperature, is not particularly limited. The temperature Tf is, for example, equal to or higher than 80°C and equal to or lower than 120°C. The value FCd is greater than the value FCc. In this embodiment, the value FCd is the maximum value of the first flow command value FC1. The value FCd, which is the maximum value of the first flow command value FC1, is not particularly limited. The value FCd is, for example, equal to or higher than 8.0 [L/min] and equal to or lower than 12.0 [L/min].
　モータ２０の温度Ｔｍが温度Ｔａ以上で、かつ、温度Ｔｂよりも低い場合、第１流量指令値ＦＣ１は、値ＦＣａと値ＦＣｂとの間で線形に変化し、モータ２０の温度Ｔｍが高いほど大きくなる。モータ２０の温度Ｔｍが温度Ｔｃ以上で、かつ、温度Ｔｄよりも低い場合、第１流量指令値ＦＣ１は、値ＦＣｂと値ＦＣｃとの間で線形に変化し、モータ２０の温度Ｔｍが高いほど大きくなる。モータ２０の温度Ｔｍが温度Ｔｅ以上で、かつ、温度Ｔｆよりも低い場合、第１流量指令値ＦＣ１は、値ＦＣｃと値ＦＣｄとの間で線形に変化し、モータ２０の温度Ｔｍが高くなるほど大きくなる。本実施形態においてモータ２０の温度Ｔｍが温度Ｔｆよりも低い場合の第１流量指令値ＦＣ１は、モータ２０の温度Ｔｍが温度Ｔｆ以上である場合の第１流量指令値ＦＣ１、すなわち値ＦＣｄよりも小さい。 When the temperature Tm of the motor 20 is equal to or higher than the temperature Ta and lower than the temperature Tb, the first flow command value FC1 changes linearly between the values FCa and FCb, and increases as the temperature Tm of the motor 20 increases. When the temperature Tm of the motor 20 is equal to or higher than the temperature Tc and lower than the temperature Td, the first flow command value FC1 changes linearly between the values FCb and FCc, and increases as the temperature Tm of the motor 20 increases. When the temperature Tm of the motor 20 is equal to or higher than the temperature Te and lower than the temperature Tf, the first flow command value FC1 changes linearly between the values FCc and FCd, and increases as the temperature Tm of the motor 20 increases. In this embodiment, the first flow command value FC1 when the temperature Tm of the motor 20 is lower than the temperature Tf is smaller than the first flow command value FC1 when the temperature Tm of the motor 20 is equal to or higher than the temperature Tf, i.e., the value FCd.
　図２に示すように、流量制御ＣＦにおいて制御装置６０は、冷却装置４０に入力される流量指令値ＦＣが第１流量指令値ＦＣ１である場合に、トルク指令値ＮＣが第１トルク指令値ＮＣ１以上か否かを判定する（ステップＳ２）。第１トルク指令値ＮＣ１は、特に限定されない。第１トルク指令値ＮＣ１は、一定の値である。第１トルク指令値ＮＣ１は、例えば、比較的大きい値のトルク指令値ＮＣである。第１トルク指令値ＮＣ１は、例えば、トルク指令値ＮＣの最大値の５０％以上、１００％未満の値である。より好ましくは、第１トルク指令値ＮＣ１は、例えば、トルク指令値ＮＣの最大値の６０％以上、９０％以下程度の範囲内の値である。 As shown in FIG. 2, in the flow control CF, when the flow command value FC input to the cooling device 40 is the first flow command value FC1, the control device 60 determines whether the torque command value NC is equal to or greater than the first torque command value NC1 (step S2). The first torque command value NC1 is not particularly limited. The first torque command value NC1 is a constant value. The first torque command value NC1 is, for example, a torque command value NC that is relatively large. The first torque command value NC1 is, for example, a value that is 50% or more and less than 100% of the maximum value of the torque command value NC. More preferably, the first torque command value NC1 is, for example, a value that is within a range of 60% or more and 90% or less of the maximum value of the torque command value NC.
　トルク指令値ＮＣが第１トルク指令値ＮＣ１よりも小さい場合（ステップＳ２：ＮＯ）、制御装置６０は、冷却装置４０に入力される流量指令値ＦＣを第１流量指令値ＦＣ１に維持する。一方、トルク指令値ＮＣが第１トルク指令値ＮＣ１以上の場合（ステップＳ２：ＹＥＳ）、制御装置６０は、流量指令値ＦＣとして第２流量指令値ＦＣ２を冷却装置４０に入力する（ステップＳ３）。つまり、流量制御ＣＦにおいて制御装置６０は、流量指令値ＦＣが第１流量指令値ＦＣ１である場合において、トルク指令値ＮＣが第１トルク指令値ＮＣ１以上となった場合に、流量指令値ＦＣを第１流量指令値ＦＣ１から第２流量指令値ＦＣ２に切り替える。言い換えれば、流量制御ＣＦは、冷却装置４０に入力する流量指令値ＦＣが第１流量指令値ＦＣ１である場合において、トルク指令値ＮＣが第１トルク指令値ＮＣ１以上となった場合に、流量指令値ＦＣを第１流量指令値ＦＣ１から第２流量指令値ＦＣ２に切り替えることを含む。 If the torque command value NC is smaller than the first torque command value NC1 (step S2: NO), the control device 60 maintains the flow command value FC input to the cooling device 40 at the first flow command value FC1. On the other hand, if the torque command value NC is equal to or greater than the first torque command value NC1 (step S2: YES), the control device 60 inputs the second flow command value FC2 as the flow command value FC to the cooling device 40 (step S3). That is, in the flow control CF, when the flow command value FC is the first flow command value FC1, if the torque command value NC becomes equal to or greater than the first torque command value NC1, the control device 60 switches the flow command value FC from the first flow command value FC1 to the second flow command value FC2. In other words, the flow control CF includes switching the flow command value FC from the first flow command value FC1 to the second flow command value FC2 when the torque command value NC becomes equal to or greater than the first torque command value NC1 when the flow command value FC input to the cooling device 40 is the first flow command value FC1.
　第２流量指令値ＦＣ２は、第１流量指令値ＦＣ１以上の値である。本実施形態において第２流量指令値ＦＣ２は、一定の値である。第２流量指令値ＦＣ２は、モータ２０の温度Ｔｍが温度Ｔｆよりも低い場合の第１流量指令値ＦＣ１よりも大きい。本実施形態において第２流量指令値ＦＣ２は、モータ２０の温度Ｔｍが温度Ｔｆ以上である場合の第１流量指令値ＦＣ１と同じ値であり、第１流量指令値ＦＣ１の最大値、すなわち値ＦＣｄと同じ値である。このように本実施形態では、第１流量指令値ＦＣ１が最大値である場合を除いて、第２流量指令値ＦＣ２は、第１流量指令値ＦＣ１よりも大きい。 The second flow command value FC2 is a value equal to or greater than the first flow command value FC1. In this embodiment, the second flow command value FC2 is a constant value. The second flow command value FC2 is greater than the first flow command value FC1 when the temperature Tm of the motor 20 is lower than the temperature Tf. In this embodiment, the second flow command value FC2 is the same value as the first flow command value FC1 when the temperature Tm of the motor 20 is equal to or greater than the temperature Tf, and is the same value as the maximum value of the first flow command value FC1, i.e., value FCd. Thus, in this embodiment, the second flow command value FC2 is greater than the first flow command value FC1, except when the first flow command value FC1 is the maximum value.
　図２に示すように、流量制御ＣＦにおいて制御装置６０は、冷却装置４０に入力される流量指令値ＦＣが第２流量指令値ＦＣ２である場合に、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下となった状態が所定時間Ｐｔ、連続経過したか否かを判定する（ステップＳ４）。第２トルク指令値ＮＣ２は、一定の値である。本実施形態において第２トルク指令値ＮＣ２は、第１トルク指令値ＮＣ１よりも小さい。第１トルク指令値ＮＣ１と第２トルク指令値ＮＣ２との差は、比較的小さい。第１トルク指令値ＮＣ１と第２トルク指令値ＮＣ２との差は、トルク指令値ＮＣの最大値を１００％としたとき、例えば、３％以上、１０％以下程度である。 As shown in FIG. 2, in the flow control CF, when the flow command value FC input to the cooling device 40 is the second flow command value FC2, the control device 60 determines whether the torque command value NC has been equal to or less than the second torque command value NC2 for a predetermined time Pt (step S4). The second torque command value NC2 is a constant value. In this embodiment, the second torque command value NC2 is smaller than the first torque command value NC1. The difference between the first torque command value NC1 and the second torque command value NC2 is relatively small. When the maximum value of the torque command value NC is 100%, the difference between the first torque command value NC1 and the second torque command value NC2 is, for example, about 3% or more and 10% or less.
　所定時間Ｐｔは、例えば、５秒以上、１００秒以下程度である。流量制御ＣＦにおいて制御装置６０は、冷却装置４０に入力される流量指令値ＦＣが第２流量指令値ＦＣ２である場合に、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下となった時点で、所定時間Ｐｔのカウントを開始する。所定時間Ｐｔが経過する前に、トルク指令値ＮＣが第２トルク指令値ＮＣ２よりも大きくなった場合には、制御装置６０は、所定時間Ｐｔのカウントを停止し、所定時間Ｐｔのカウントをゼロに戻す。トルク指令値ＮＣが再び第２トルク指令値ＮＣ２以下となった場合、制御装置６０は、所定時間Ｐｔのカウントを再び開始する。 The predetermined time Pt is, for example, about 5 seconds or more and 100 seconds or less. In the flow control CF, when the flow command value FC input to the cooling device 40 is the second flow command value FC2, the control device 60 starts counting the predetermined time Pt when the torque command value NC becomes equal to or less than the second torque command value NC2. If the torque command value NC becomes greater than the second torque command value NC2 before the predetermined time Pt has elapsed, the control device 60 stops counting the predetermined time Pt and returns the count to zero. If the torque command value NC becomes equal to or less than the second torque command value NC2 again, the control device 60 starts counting the predetermined time Pt again.
　トルク指令値ＮＣが第２トルク指令値ＮＣ２以下となった状態で所定時間Ｐｔが連続経過していない場合（ステップＳ４：ＮＯ）、制御装置６０は、冷却装置４０に入力される流量指令値ＦＣを第２流量指令値ＦＣ２に維持する。一方、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下となった状態で所定時間Ｐｔが連続経過した場合（ステップＳ４：ＹＥＳ）、制御装置６０は、流量指令値ＦＣとして第１流量指令値ＦＣ１を冷却装置４０に入力する（ステップＳ１）。 If the torque command value NC is equal to or less than the second torque command value NC2 and the predetermined time Pt has not elapsed continuously (step S4: NO), the control device 60 maintains the flow command value FC input to the cooling device 40 at the second flow command value FC2. On the other hand, if the torque command value NC is equal to or less than the second torque command value NC2 and the predetermined time Pt has elapsed continuously (step S4: YES), the control device 60 inputs the first flow command value FC1 as the flow command value FC to the cooling device 40 (step S1).
　このように、流量制御ＣＦにおいて制御装置６０は、流量指令値ＦＣが第２流量指令値ＦＣ２である場合において、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下である場合に、流量指令値ＦＣを第２流量指令値ＦＣ２から第１流量指令値ＦＣ１に切り替える。より詳細には、流量制御ＣＦにおいて制御装置６０は、流量指令値ＦＣが第２流量指令値ＦＣ２である場合において、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下である状態が所定時間Ｐｔ以上続いた場合に、流量指令値ＦＣを第２流量指令値ＦＣ２から第１流量指令値ＦＣ１に切り替える。 In this way, in the flow control CF, when the flow command value FC is the second flow command value FC2, if the torque command value NC is equal to or less than the second torque command value NC2, the control device 60 switches the flow command value FC from the second flow command value FC2 to the first flow command value FC1. More specifically, in the flow control CF, when the flow command value FC is the second flow command value FC2, if the state in which the torque command value NC is equal to or less than the second torque command value NC2 continues for a predetermined time Pt or more, the control device 60 switches the flow command value FC from the second flow command value FC2 to the first flow command value FC1.
　言い換えれば、流量制御ＣＦは、流量指令値ＦＣが第２流量指令値ＦＣ２である場合において、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下である場合に、流量指令値ＦＣを第２流量指令値ＦＣ２から第１流量指令値ＦＣ１に切り替えることを含む。より詳細には、流量制御ＣＦは、流量指令値ＦＣが第２流量指令値ＦＣ２である場合において、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下である状態が所定時間Ｐｔ以上続いた場合に、流量指令値ＦＣを第２流量指令値ＦＣ２から第１流量指令値ＦＣ１に切り替えることを含む。 In other words, the flow control CF includes switching the flow command value FC from the second flow command value FC2 to the first flow command value FC1 when the flow command value FC is the second flow command value FC2 and the torque command value NC is equal to or less than the second torque command value NC2. More specifically, the flow control CF includes switching the flow command value FC from the second flow command value FC2 to the first flow command value FC1 when the flow command value FC is the second flow command value FC2 and the state in which the torque command value NC is equal to or less than the second torque command value NC2 continues for a predetermined time Pt or more.
　以上のように、流量制御ＣＦにおいて制御装置６０は、冷却装置４０に入力する流量指令値ＦＣを、モータ２０の温度Ｔｍに基づいて変動する第１流量指令値ＦＣ１と、第１流量指令値ＦＣ１以上の第２流量指令値ＦＣ２と、に切り替え可能である。本実施形態の流量制御ＣＦにおいて制御装置６０は、上述したステップＳ１からステップＳ４までを繰り返し行うことで、モータ２０の温度Ｔｍおよびトルク指令値ＮＣに基づいて冷却装置４０を制御し、モータ２０に送られるオイルＯの流量の制御を行う。 As described above, in the flow control CF, the control device 60 can switch the flow command value FC input to the cooling device 40 between a first flow command value FC1 that varies based on the temperature Tm of the motor 20, and a second flow command value FC2 that is equal to or greater than the first flow command value FC1. In the flow control CF of this embodiment, the control device 60 repeatedly performs steps S1 to S4 described above to control the cooling device 40 based on the temperature Tm of the motor 20 and the torque command value NC, and controls the flow rate of oil O sent to the motor 20.
　本実施形態の流量制御ＣＦにおいて制御装置６０は、例えば、切替フラグＦＬを０と１との間で切り替えて、流量指令値ＦＣを第１流量指令値ＦＣ１と第２流量指令値ＦＣ２との間で切り替えている。切替フラグＦＬが０の場合には、制御装置６０は、流量指令値ＦＣを第１流量指令値ＦＣ１とする。切替フラグＦＬが１の場合には、制御装置６０は、流量指令値ＦＣを第２流量指令値ＦＣ２とする。制御装置６０は、トルク指令値ＮＣに基づいて切替フラグＦＬを切り替えて、上述したように流量指令値ＦＣを切り替えている。 In the flow control CF of this embodiment, the control device 60 switches the flow command value FC between a first flow command value FC1 and a second flow command value FC2, for example, by switching the switching flag FL between 0 and 1. When the switching flag FL is 0, the control device 60 sets the flow command value FC to the first flow command value FC1. When the switching flag FL is 1, the control device 60 sets the flow command value FC to the second flow command value FC2. The control device 60 switches the switching flag FL based on the torque command value NC, and switches the flow command value FC as described above.
　図４は、流量制御ＣＦにおけるトルク指令値ＮＣ、流量指令値ＦＣ、および切替フラグＦＬのそれぞれの時間変化の一例を示すグラフである。図４には、上下方向に並べて３つのグラフを示している。図４の一番上のグラフは、トルク指令値ＮＣの時間変化の一例を示すグラフである。図４の一番上のグラフにおいて、横軸は時間ｔを示し、縦軸はトルク指令値ＮＣを示している。図４の中央のグラフは、流量指令値ＦＣの時間変化の一例を示すグラフである。図４の中央のグラフにおいて、横軸は時間ｔを示し、縦軸は流量指令値ＦＣを示している。図４の一番下のグラフは、切替フラグＦＬの時間変化の一例を示すグラフである。図４の一番下のグラフにおいて、横軸は時間ｔを示し、縦軸は切替フラグＦＬを示している。 FIG. 4 is a graph showing an example of the change over time of the torque command value NC, the flow command value FC, and the switching flag FL in the flow control CF. Three graphs are shown arranged vertically in FIG. 4. The top graph in FIG. 4 is a graph showing an example of the change over time of the torque command value NC. In the top graph in FIG. 4, the horizontal axis indicates time t, and the vertical axis indicates the torque command value NC. The center graph in FIG. 4 is a graph showing an example of the change over time of the flow command value FC. In the center graph in FIG. 4, the horizontal axis indicates time t, and the vertical axis indicates the flow command value FC. The bottom graph in FIG. 4 is a graph showing an example of the change over time of the switching flag FL. In the bottom graph in FIG. 4, the horizontal axis indicates time t, and the vertical axis indicates the switching flag FL.
　図４の例では、時刻ｔ０から時刻ｔ１までは、トルク指令値ＮＣが第１トルク指令値ＮＣ１よりも小さく、流量指令値ＦＣは、第１流量指令値ＦＣ１となっている。このとき、切替フラグＦＬは０であり、第１流量指令値ＦＣ１の値は値ＦＣｃである。時刻ｔ１においてトルク指令値ＮＣが第１トルク指令値ＮＣ１以上になると、切替フラグＦＬが１に切り替えられ、流量指令値ＦＣが第２流量指令値ＦＣ２に切り替えられる。本実施形態において第２流量指令値ＦＣ２の値は値ＦＣｄで一定であるため、時刻ｔ１において流量指令値ＦＣは、値ＦＣｃから値ＦＣｄに大きくなる。 In the example of FIG. 4, from time t0 to time t1, the torque command value NC is smaller than the first torque command value NC1, and the flow command value FC is the first flow command value FC1. At this time, the switching flag FL is 0, and the value of the first flow command value FC1 is the value FCc. When the torque command value NC becomes equal to or greater than the first torque command value NC1 at time t1, the switching flag FL is switched to 1, and the flow command value FC is switched to the second flow command value FC2. In this embodiment, the value of the second flow command value FC2 is constant at the value FCd, so that at time t1 the flow command value FC increases from the value FCc to the value FCd.
　時刻ｔ１よりも後の時刻ｔ２になり、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下になると、制御装置６０は、所定時間Ｐｔのカウントを開始する。なお、時刻ｔ１の後、かつ、時刻ｔ２よりも前においてトルク指令値ＮＣが第１トルク指令値ＮＣ１よりも小さくなっている時間があるが、この時間においてはトルク指令値ＮＣが第２トルク指令値ＮＣ２よりも大きいため、所定時間Ｐｔのカウントは開始されない。トルク指令値ＮＣが第２トルク指令値ＮＣ２以下のまま、時刻ｔ２から所定時間Ｐｔが経過した時刻ｔ３になると、切替フラグＦＬが０となり、流量指令値ＦＣが第１流量指令値ＦＣ１に切り替えられる。 When the torque command value NC becomes equal to or less than the second torque command value NC2 at time t2, which is later than time t1, the control device 60 starts counting the predetermined time Pt. Note that there is a period of time after time t1 and before time t2 when the torque command value NC is smaller than the first torque command value NC1, but since the torque command value NC is greater than the second torque command value NC2 during this period, counting the predetermined time Pt does not start. When the torque command value NC remains equal to or less than the second torque command value NC2 and the predetermined time Pt has elapsed since time t2 at time t3, the switching flag FL becomes 0, and the flow command value FC is switched to the first flow command value FC1.
　時刻ｔ３から時刻ｔ４までの間においては、第１流量指令値ＦＣ１は、値ＦＣｃとなっている。時刻ｔ４から時刻ｔ５までの間においては、第１流量指令値ＦＣ１は、値ＦＣｃから値ＦＣｂに向けて線形に低下している。時刻ｔ５から時刻ｔ６までの間においては、第１流量指令値ＦＣ１は、値ＦＣｂとなっている。つまり、時刻ｔ３から時刻ｔ６までの間に、モータ２０の温度Ｔｍが低下し、第１流量指令値ＦＣ１が値ＦＣｃから値ＦＣｂに変動している。 Between time t3 and time t4, the first flow command value FC1 is equal to the value FCc. Between time t4 and time t5, the first flow command value FC1 decreases linearly from the value FCc to the value FCb. Between time t5 and time t6, the first flow command value FC1 is equal to the value FCb. In other words, between time t3 and time t6, the temperature Tm of the motor 20 decreases, and the first flow command value FC1 changes from the value FCc to the value FCb.
　時刻ｔ６においてトルク指令値ＮＣが再び第１トルク指令値ＮＣ１以上になると、切替フラグＦＬが再び１に切り替えられ、流量指令値ＦＣが第２流量指令値ＦＣ２に再び切り替えられる。その後、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下となった時刻ｔ７において所定時間Ｐｔのカウントが開始され、時刻ｔ７の所定時間Ｐｔ後の時刻ｔ８において、切替フラグＦＬが再び０に切り替えられ、流量指令値ＦＣが第１流量指令値ＦＣ１に再び切り替えられる。 When the torque command value NC again becomes equal to or greater than the first torque command value NC1 at time t6, the switching flag FL is switched back to 1, and the flow command value FC is switched back to the second flow command value FC2. Then, at time t7 when the torque command value NC becomes equal to or less than the second torque command value NC2, counting of the predetermined time Pt begins, and at time t8, the predetermined time Pt after time t7, the switching flag FL is switched back to 0, and the flow command value FC is switched back to the first flow command value FC1.
　以上のように、本実施形態の流量制御ＣＦでは、トルク指令値ＮＣが比較的小さい値、すなわち第１トルク指令値ＮＣ１よりも小さい値である場合には、モータ２０の温度Ｔｍに基づいて流量指令値ＦＣが変動し、トルク指令値ＮＣが比較的大きい値、すなわち第１トルク指令値ＮＣ１以上になった際には、流量指令値ＦＣが強制的に大きな一定の値、すなわち第２流量指令値ＦＣ２となる。本実施形態の流量制御ＣＦでは、第２流量指令値ＦＣ２が第１流量指令値ＦＣ１の最大値と同じ値であるため、トルク指令値ＮＣが第１トルク指令値ＮＣ１以上になった際に、流量指令値ＦＣが、強制的に、モータ２０の温度Ｔｍに基づいて変動する第１流量指令値ＦＣ１の最大値と同じ値となる。 As described above, in the flow control CF of this embodiment, when the torque command value NC is a relatively small value, i.e., a value smaller than the first torque command value NC1, the flow command value FC fluctuates based on the temperature Tm of the motor 20, and when the torque command value NC becomes a relatively large value, i.e., equal to or greater than the first torque command value NC1, the flow command value FC is forcibly set to a large constant value, i.e., the second flow command value FC2. In the flow control CF of this embodiment, since the second flow command value FC2 is the same value as the maximum value of the first flow command value FC1, when the torque command value NC becomes equal to or greater than the first torque command value NC1, the flow command value FC is forcibly set to the same value as the maximum value of the first flow command value FC1, which fluctuates based on the temperature Tm of the motor 20.
　車両制御部ＥＣＵから制御装置６０に入力されるトルク指令値ＮＣが大きくなると、モータ２０に供給される電流Ｉｍが増加し、モータ２０の温度Ｔｍも高くなる。特に、トルク指令値ＮＣが或る程度の値よりも大きくなると、モータ２０の温度Ｔｍが急激に上昇しやすい。このような場合、モータ２０の温度Ｔｍに基づいて冷却装置４０からモータ２０に送られるオイルＯの流量を増加させても、オイルＯがモータ２０に到達するまでの時間差によって、モータ２０の冷却が間に合わない場合がある。そのため、モータ２０の冷却が不十分となる恐れがある。 When the torque command value NC input from the vehicle control unit ECU to the control device 60 increases, the current Im supplied to the motor 20 increases and the temperature Tm of the motor 20 also increases. In particular, when the torque command value NC exceeds a certain value, the temperature Tm of the motor 20 is likely to rise suddenly. In such a case, even if the flow rate of oil O sent from the cooling device 40 to the motor 20 is increased based on the temperature Tm of the motor 20, the motor 20 may not be cooled in time due to the time difference until the oil O reaches the motor 20. As a result, there is a risk that the motor 20 will not be cooled sufficiently.
　これに対して、本実施形態によれば、流量制御ＣＦにおいて制御装置６０は、流量指令値ＦＣが第１流量指令値ＦＣ１である場合において、トルク指令値ＮＣが第１トルク指令値ＮＣ１以上となった場合に、流量指令値ＦＣを、モータ２０の温度Ｔｍに基づいて変動する第１流量指令値ＦＣ１から、第１流量指令値ＦＣ１以上の第２流量指令値ＦＣ２に切り替える。そのため、トルク指令値ＮＣが第１トルク指令値ＮＣ１以上となった際に、冷却装置４０に入力される流量指令値ＦＣを、モータ２０の温度Ｔｍによらず、モータ２０の温度Ｔｍに基づく第１流量指令値ＦＣ１以上の第２流量指令値ＦＣ２とすることができる。これにより、トルク指令値ＮＣの上昇に伴ってモータ２０の温度Ｔｍが実際に上昇する前に冷却装置４０に送られる流量指令値ＦＣを上昇させやすく、モータ２０の温度Ｔｍが実際に上昇する前、またはモータ２０の温度Ｔｍの上昇に合わせて、モータ２０に到達するオイルＯの流量を大きくしやすい。したがって、冷却装置４０から送られるオイルＯによるモータ２０の冷却が間に合わないことを抑制でき、冷却装置４０によるモータ２０の冷却が不十分となることを抑制できる。 In contrast, according to the present embodiment, in the flow control CF, when the flow command value FC is the first flow command value FC1, if the torque command value NC becomes equal to or greater than the first torque command value NC1, the control device 60 switches the flow command value FC from the first flow command value FC1, which varies based on the temperature Tm of the motor 20, to a second flow command value FC2 equal to or greater than the first flow command value FC1. Therefore, when the torque command value NC becomes equal to or greater than the first torque command value NC1, the flow command value FC input to the cooling device 40 can be set to the second flow command value FC2 equal to or greater than the first flow command value FC1 based on the temperature Tm of the motor 20, regardless of the temperature Tm of the motor 20. This makes it easier to increase the flow command value FC sent to the cooling device 40 before the temperature Tm of the motor 20 actually rises with the increase in the torque command value NC, and makes it easier to increase the flow rate of the oil O that reaches the motor 20 before the temperature Tm of the motor 20 actually rises, or in accordance with the rise in the temperature Tm of the motor 20. This prevents the oil O sent from the cooling device 40 from cooling the motor 20 in time, and prevents the cooling device 40 from cooling the motor 20 insufficiently.
　また、トルク指令値ＮＣが第１トルク指令値ＮＣ１以上となる前においては、制御装置６０は、モータ２０の温度Ｔｍに基づいて冷却装置４０からモータ２０に送られるオイルＯの量を変動させる。そのため、トルク指令値ＮＣが比較的小さく、モータ２０の温度Ｔｍが急上昇しにくい場合には、冷却装置４０からモータ２０に送られるオイルＯの量が不必要に多くなることを抑制できる。したがって、冷却装置４０において消費される電力が増大することを抑制でき、駆動装置１００において消費される電力が増大することを抑制できる。 In addition, before the torque command value NC becomes equal to or greater than the first torque command value NC1, the control device 60 varies the amount of oil O sent from the cooling device 40 to the motor 20 based on the temperature Tm of the motor 20. Therefore, when the torque command value NC is relatively small and the temperature Tm of the motor 20 is unlikely to rise suddenly, it is possible to prevent the amount of oil O sent from the cooling device 40 to the motor 20 from becoming unnecessarily large. Therefore, it is possible to prevent an increase in the power consumed by the cooling device 40, and to prevent an increase in the power consumed by the drive device 100.
　より具体的に説明すると、例えば、車両を運転する運転者がアクセルを大きく踏み込んだ場合には、トルク指令値ＮＣが通常の走行時よりも大きくなり、モータ２０の温度Ｔｍが急上昇しやすい。このような場合に、モータ２０の温度Ｔｍのみに基づいて冷却装置４０から送られるオイルＯの流量を制御すると、上述したようにオイルＯの流量の増加が間に合わず、モータ２０の冷却が間に合わなくなりやすい。これに対して、本実施形態によれば、モータ２０の温度Ｔｍだけでなく、トルク指令値ＮＣにも基づいて冷却装置４０を制御するため、運転者がアクセルを大きく踏み込んでトルク指令値ＮＣが通常の走行時よりも大きくなった場合には、モータ２０の温度ＴｍによらずオイルＯの流量を強制的に大きくすることができ、モータ２０の冷却が間に合わなくなることを抑制できる。 To explain more specifically, for example, if the driver of the vehicle depresses the accelerator pedal deeply, the torque command value NC becomes larger than during normal driving, and the temperature Tm of the motor 20 is likely to rise sharply. In such a case, if the flow rate of oil O sent from the cooling device 40 is controlled based only on the temperature Tm of the motor 20, the increase in the flow rate of oil O will not be able to keep up, as described above, and the cooling of the motor 20 will likely not be able to keep up. In contrast, according to this embodiment, the cooling device 40 is controlled based not only on the temperature Tm of the motor 20 but also on the torque command value NC, so that when the driver depresses the accelerator pedal deeply and the torque command value NC becomes larger than during normal driving, the flow rate of oil O can be forcibly increased regardless of the temperature Tm of the motor 20, and it is possible to prevent the cooling of the motor 20 from not being able to keep up.
　また、本実施形態によれば、流量制御ＣＦにおいて制御装置６０は、流量指令値ＦＣが第２流量指令値ＦＣ２である場合において、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下である場合に、流量指令値ＦＣを第２流量指令値ＦＣ２から第１流量指令値ＦＣ１に切り替える。そのため、トルク指令値ＮＣが小さくなり、モータ２０に送られるオイルＯの流量を強制的に大きくしておく必要がなくなった場合には、モータ２０に送られるオイルＯの流量をモータ２０の温度Ｔｍに基づいて変動させる制御に戻すことができる。これにより、冷却装置４０からモータ２０に送られるオイルＯの量が不必要に多くなることをより抑制できる。したがって、冷却装置４０において消費される電力が増大することをより抑制でき、駆動装置１００において消費される電力が増大することをより抑制できる。 Furthermore, according to this embodiment, in the flow control CF, when the flow command value FC is the second flow command value FC2, and the torque command value NC is equal to or less than the second torque command value NC2, the control device 60 switches the flow command value FC from the second flow command value FC2 to the first flow command value FC1. Therefore, when the torque command value NC becomes small and it is no longer necessary to forcibly increase the flow rate of the oil O sent to the motor 20, the control can be returned to one in which the flow rate of the oil O sent to the motor 20 varies based on the temperature Tm of the motor 20. This can further prevent the amount of oil O sent from the cooling device 40 to the motor 20 from becoming unnecessarily large. Therefore, it can further prevent the power consumed by the cooling device 40 from increasing, and can further prevent the power consumed by the drive device 100 from increasing.
　また、本実施形態によれば、第２トルク指令値ＮＣ２は、第１トルク指令値ＮＣ１よりも小さい。そのため、例えば、トルク指令値ＮＣが第１トルク指令値ＮＣ１以上となって流量指令値ＦＣが第２流量指令値ＦＣ２となった後に、トルク指令値ＮＣが不安定で第１トルク指令値ＮＣ１の近傍で上昇と下降を繰り返すような場合などであっても、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下とならなければ、流量指令値ＦＣが切り替わることがない。これにより、短時間の間に流量指令値ＦＣが第１流量指令値ＦＣ１と第２流量指令値ＦＣ２との間で頻繁に切り替えられることを抑制できる。したがって、冷却装置４０に負荷が掛かることを抑制できる。 Furthermore, according to this embodiment, the second torque command value NC2 is smaller than the first torque command value NC1. Therefore, for example, even if the torque command value NC is unstable and repeatedly rises and falls near the first torque command value NC1 after the torque command value NC becomes equal to or greater than the first torque command value NC1 and the flow command value FC becomes the second flow command value FC2, the flow command value FC will not be switched unless the torque command value NC becomes equal to or less than the second torque command value NC2. This makes it possible to prevent the flow command value FC from being frequently switched between the first flow command value FC1 and the second flow command value FC2 within a short period of time. Therefore, it is possible to prevent a load from being applied to the cooling device 40.
　また、本実施形態によれば、流量制御ＣＦにおいて制御装置６０は、流量指令値ＦＣが第２流量指令値ＦＣ２である場合において、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下である状態が所定時間Ｐｔ以上続いた場合に、流量指令値ＦＣを第２流量指令値ＦＣ２から第１流量指令値ＦＣ１に切り替える。そのため、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下となっても直ちに流量指令値ＦＣが第１流量指令値ＦＣ１に切り替わることがない。これにより、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下となった際にモータ２０の温度Ｔｍが十分に低下していない場合であっても、引き続き第２流量指令値ＦＣ２に基づく流量のオイルＯをモータ２０に送ることができ、モータ２０を好適に冷却できる。したがって、モータ２０の冷却が不十分になることをより抑制できる。 Furthermore, according to this embodiment, in the flow control CF, when the flow command value FC is the second flow command value FC2, if the state in which the torque command value NC is equal to or less than the second torque command value NC2 continues for a predetermined time Pt or more, the control device 60 switches the flow command value FC from the second flow command value FC2 to the first flow command value FC1. Therefore, even if the torque command value NC becomes equal to or less than the second torque command value NC2, the flow command value FC does not immediately switch to the first flow command value FC1. As a result, even if the temperature Tm of the motor 20 has not dropped sufficiently when the torque command value NC becomes equal to or less than the second torque command value NC2, the oil O can continue to be sent to the motor 20 at a flow rate based on the second flow command value FC2, and the motor 20 can be appropriately cooled. Therefore, it is possible to further prevent the motor 20 from being insufficiently cooled.
　また、例えば、運転者によっては、アクセルを大きく踏み込む動作を短時間の間に繰り返し行うこともある。このような場合、トルク指令値ＮＣは、短時間の間に、第１トルク指令値ＮＣ１以上の値と、第２トルク指令値ＮＣ２以下の値と、を繰り返す場合がある。この場合において、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下になった場合に直ちに流量指令値ＦＣが第１流量指令値ＦＣ１に戻されると、流量指令値ＦＣが第１流量指令値ＦＣ１と第２流量指令値ＦＣ２との間で短時間の間に頻繁に切り替えられることとなる。これに対して、本実施形態では、トルク指令値ＮＣが第２トルク指令値ＮＣ２以下となっても、所定時間Ｐｔが経過しなければ、流量指令値ＦＣが第１流量指令値ＦＣ１に戻らない。そのため、例えば、アクセルを大きく踏み込む動作が短時間の間に繰り返し行われるような場合には、流量指令値ＦＣを第２流量指令値ＦＣ２のまま維持しておくことが可能である。これにより、短時間の間に流量指令値ＦＣが第１流量指令値ＦＣ１と第２流量指令値ＦＣ２との間で頻繁に切り替えられることをより抑制できる。したがって、冷却装置４０に負荷が掛かることをより抑制できる。 Also, for example, some drivers may repeatedly depress the accelerator pedal heavily in a short period of time. In such a case, the torque command value NC may repeatedly change between a value equal to or greater than the first torque command value NC1 and a value equal to or less than the second torque command value NC2 in a short period of time. In this case, if the flow command value FC is immediately returned to the first flow command value FC1 when the torque command value NC becomes equal to or less than the second torque command value NC2, the flow command value FC will be frequently switched between the first flow command value FC1 and the second flow command value FC2 in a short period of time. In contrast, in this embodiment, even if the torque command value NC becomes equal to or less than the second torque command value NC2, the flow command value FC will not return to the first flow command value FC1 until a predetermined time Pt has elapsed. Therefore, for example, when the accelerator pedal is repeatedly depressing the accelerator pedal heavily in a short period of time, it is possible to maintain the flow command value FC at the second flow command value FC2. This makes it possible to prevent the flow command value FC from being frequently switched between the first flow command value FC1 and the second flow command value FC2 in a short period of time. Therefore, it is possible to further prevent the load on the cooling device 40.
　また、本実施形態によれば、第２流量指令値ＦＣ２は、モータ２０の温度Ｔｍが温度Ｔｆよりも低い場合の第１流量指令値ＦＣ１よりも大きい。そのため、流量指令値ＦＣが第１流量指令値ＦＣ１から第２流量指令値ＦＣ２に切り替えられた際に、モータ２０に送られるオイルＯの流量を好適に増加させやすい。 Furthermore, according to this embodiment, the second flow command value FC2 is greater than the first flow command value FC1 when the temperature Tm of the motor 20 is lower than the temperature Tf. Therefore, when the flow command value FC is switched from the first flow command value FC1 to the second flow command value FC2, it is easy to suitably increase the flow rate of the oil O sent to the motor 20.
　また、本実施形態によれば、第２流量指令値ＦＣ２は、モータ２０の温度Ｔｍが第１温度である温度Ｔｆ以上である場合の第１流量指令値ＦＣ１と同じ値であり、第１流量指令値ＦＣ１の最大値と同じ値である。そのため、流量指令値ＦＣが第２流量指令値ＦＣ２に切り替えられると、冷却装置４０からモータ２０に送られるオイルＯの流量を、第１流量指令値ＦＣ１に基づいた最大の流量と同じ流量にすることができる。したがって、流量指令値ＦＣが第２流量指令値ＦＣ２に切り替えられた際に、モータ２０に送られるオイルＯの流量をより好適に増加させることができる。 Furthermore, according to this embodiment, the second flow command value FC2 is the same value as the first flow command value FC1 when the temperature Tm of the motor 20 is equal to or higher than the first temperature Tf, and is the same value as the maximum value of the first flow command value FC1. Therefore, when the flow command value FC is switched to the second flow command value FC2, the flow rate of the oil O sent from the cooling device 40 to the motor 20 can be set to the same flow rate as the maximum flow rate based on the first flow command value FC1. Therefore, when the flow command value FC is switched to the second flow command value FC2, the flow rate of the oil O sent to the motor 20 can be more suitably increased.
（変形例）
　本変形例において制御装置６０は、モータ２０の温度Ｔｍが温度Ｔｇ以上である場合に上述した流量制御ＣＦを実行する。温度Ｔｇは、第１温度である温度Ｔｆよりも低い第２温度に相当する。図３に示すように、温度Ｔｇは、温度Ｔａよりも低い温度である。温度Ｔｇは、特に限定されない。温度Ｔｇは、例えば、－４０℃以上、－２０℃以下程度である。本実施形態ではモータ２０の温度Ｔｍが温度Ｔａよりも低い場合に第１流量指令値ＦＣ１が値ＦＣａであるため、モータ２０の温度Ｔｍが温度Ｔｇ以下である場合にも、第１流量指令値ＦＣ１は、値ＦＣａである。つまり、モータ２０の温度Ｔｍが第２温度である温度Ｔｇよりも低い場合における第１流量指令値ＦＣ１は、第１流量指令値ＦＣ１の最小値である。 (Modification)
In this modification, the control device 60 executes the above-described flow control CF when the temperature Tm of the motor 20 is equal to or higher than the temperature Tg. The temperature Tg corresponds to a second temperature lower than the temperature Tf, which is the first temperature. As shown in FIG. 3, the temperature Tg is lower than the temperature Ta. The temperature Tg is not particularly limited. The temperature Tg is, for example, about −40° C. or higher and −20° C. or lower. In this embodiment, when the temperature Tm of the motor 20 is lower than the temperature Ta, the first flow command value FC1 is the value FCa, so that even when the temperature Tm of the motor 20 is equal to or lower than the temperature Tg, the first flow command value FC1 is the value FCa. In other words, when the temperature Tm of the motor 20 is lower than the temperature Tg, the first flow command value FC1 is the minimum value of the first flow command value FC1.
　モータ２０の温度Ｔｍが十分に低い場合には、トルク指令値ＮＣが或る程度大きくなっても、モータ２０の温度Ｔｍが上昇しにくい、または上昇しても問題となる温度になりにくい。そのため、モータ２０の温度Ｔｍが十分に低い場合には、トルク指令値ＮＣが或る程度大きくなっても、強制的にオイルＯの流量を増加させる必要がない場合がある。したがって、モータ２０の温度Ｔｍが温度Ｔｇ以上である場合に流量制御ＣＦを実行することとし、モータ２０の温度Ｔｍが温度Ｔｇよりも低い場合には流量制御ＣＦを実行しないことで、不必要にオイルＯの流量が大きくなることを抑制できる。これにより、冷却装置４０において消費される電力が増大することをより抑制でき、駆動装置１００において消費される電力が増大することをより抑制できる。 When the temperature Tm of the motor 20 is sufficiently low, even if the torque command value NC increases to a certain extent, the temperature Tm of the motor 20 is unlikely to rise, or is unlikely to rise to a temperature that causes problems. Therefore, when the temperature Tm of the motor 20 is sufficiently low, even if the torque command value NC increases to a certain extent, there may be cases where it is not necessary to forcibly increase the flow rate of the oil O. Therefore, by executing the flow rate control CF when the temperature Tm of the motor 20 is equal to or higher than the temperature Tg, and not executing the flow rate control CF when the temperature Tm of the motor 20 is lower than the temperature Tg, it is possible to prevent the flow rate of the oil O from increasing unnecessarily. This makes it possible to further prevent an increase in the power consumed by the cooling device 40, and to further prevent an increase in the power consumed by the drive device 100.
　また、本変形例によれば、モータ２０の温度Ｔｍが第２温度である温度Ｔｇよりも低い場合における第１流量指令値ＦＣ１は、第１流量指令値ＦＣ１の最小値である。つまり、モータ２０の温度Ｔｍが温度Ｔｇよりも低い場合には、モータ２０に供給する必要があるオイルＯの量が少ない。そのため、モータ２０の温度Ｔｍが温度Ｔｇよりも低い範囲においては、流量制御ＣＦを実行しなくても、モータ２０の冷却が不十分になりにくい。したがって、モータ２０の温度Ｔｍが温度Ｔｇ以上の場合に流量制御ＣＦを実行することで、流量制御ＣＦを必要な範囲でより好適に実行することができる。 Furthermore, according to this modified example, the first flow command value FC1 when the temperature Tm of the motor 20 is lower than the second temperature Tg is the minimum value of the first flow command value FC1. In other words, when the temperature Tm of the motor 20 is lower than the temperature Tg, the amount of oil O that needs to be supplied to the motor 20 is small. Therefore, in the range in which the temperature Tm of the motor 20 is lower than the temperature Tg, the cooling of the motor 20 is unlikely to be insufficient even if the flow control CF is not executed. Therefore, by executing the flow control CF when the temperature Tm of the motor 20 is equal to or higher than the temperature Tg, the flow control CF can be executed more suitably within the required range.
　本発明は上述の実施形態に限られず、本発明の技術的思想の範囲内において、他の構成および他の方法を採用することもできる。制御装置は、モータの温度およびモータのトルク指令値に基づいて冷却装置からモータに送られる冷媒の流量を制御する流量制御を実行可能で、冷却装置を制御する装置であれば、どのような構成であってもよいし、どのような制御を実行可能であってもよい。制御装置は、モータを制御しなくもよい。この場合、流量制御を実行可能で冷却装置を制御する制御装置とは別に、モータを制御する装置が設けられてもよい。また、この場合、制御装置は、冷却装置と一体に設けられてもよい。 The present invention is not limited to the above-described embodiment, and other configurations and methods may be adopted within the scope of the technical concept of the present invention. The control device may have any configuration and may be capable of performing any type of control, so long as it is a device that controls the cooling device and is capable of performing flow control to control the flow rate of refrigerant sent from the cooling device to the motor based on the motor temperature and the motor torque command value. The control device does not have to control the motor. In this case, a device that controls the motor may be provided separately from a control device that is capable of performing flow control and controls the cooling device. Also, in this case, the control device may be provided integrally with the cooling device.
　制御装置は、モータの温度およびトルク指令値に基づいて冷媒の流量を制御する流量制御とは異なる制御で、かつ、冷却装置からモータに送られる冷媒の流量を制御する他の制御を実行可能であってもよい。当該他の制御は、モータの温度のみに基づいた冷媒の流量の制御であってもよいし、その他のパラメータに基づいた冷媒の流量の制御であってもよい。制御装置は、どのような条件に基づいて流量制御を実行するか否かを決めてもよい。 The control device may be capable of executing other control that controls the flow rate of the refrigerant sent from the cooling device to the motor, which is different from the flow rate control that controls the flow rate of the refrigerant based on the motor temperature and torque command value. The other control may be control of the flow rate of the refrigerant based only on the motor temperature, or may be control of the flow rate of the refrigerant based on other parameters. The control device may decide based on what conditions whether or not to execute flow rate control.
　なお、「流量制御がモータの温度およびモータのトルク指令値に基づいて冷媒の流量を制御する」とは、当該流量制御が、モータの温度をパラメータとして使用する演算、およびモータのトルク指令値をパラメータとして使用する演算を、少なくとも含んでいればよい。 Note that "the flow control controls the flow rate of the refrigerant based on the motor temperature and the motor torque command value" means that the flow control includes at least a calculation that uses the motor temperature as a parameter and a calculation that uses the motor torque command value as a parameter.
　モータの温度およびモータのトルク指令値に基づいて冷媒の流量を制御する流量制御は、流量指令値が第１流量指令値である場合において、トルク指令値が第１トルク指令値以上となった場合に、流量指令値を第１流量指令値から第２流量指令値に切り替えられるならば、どのような制御であってもよい。例えば、流量制御は、流量指令値が第２流量指令値である場合においてトルク指令値が第２トルク指令値以下となった場合に直ちに、流量指令値を第１流量指令値に切り替える制御であってもよい。第２トルク指令値は、第１トルク指令値と同じ値であってもよい。 The flow control that controls the flow rate of the refrigerant based on the motor temperature and the motor torque command value may be any type of control as long as, when the flow rate command value is the first flow rate command value, the flow rate command value can be switched from the first flow rate command value to the second flow rate command value when the torque command value becomes equal to or greater than the first torque command value. For example, the flow rate control may be a control that immediately switches the flow rate command value to the first flow rate command value when the flow rate command value is the second flow rate command value and the torque command value becomes equal to or less than the second torque command value. The second torque command value may be the same value as the first torque command value.
　また、例えば、流量制御は、流量指令値が第２流量指令値である場合において、トルク指令値以外のパラメータに基づいて、流量指令値が第１流量指令値に切り替えられる制御であってもよい。具体的に、例えば、流量制御は、流量指令値が第２流量指令値に切り替えられた後に、モータの温度に基づいて流量指令値を第１流量指令値に切り替える制御であってもよい。この場合、例えば、流量制御において制御装置は、流量指令値が第２流量指令値である場合において、モータの温度が所定の温度以下である場合に、流量指令値を第２流量指令値から第１流量指令値に切り替えてもよい。また、例えば、流量制御は、流量指令値が第２流量指令値に切り替えられた後に、モータの温度およびモータのトルク指令値の両方に基づいて流量指令値を第１流量指令値に切り替える制御であってもよい。この場合、例えば、流量制御において制御装置は、流量指令値が第２流量指令値である場合において、モータの温度が所定の温度以下で、かつ、トルク指令値が所定の値以下である場合に、流量指令値を第２流量指令値から第１流量指令値に切り替えてもよい。 Furthermore, for example, the flow control may be a control in which, when the flow command value is the second flow command value, the flow command value is switched to the first flow command value based on a parameter other than the torque command value. Specifically, for example, the flow control may be a control in which, after the flow command value is switched to the second flow command value, the flow command value is switched to the first flow command value based on the temperature of the motor. In this case, for example, in the flow control, the control device may switch the flow command value from the second flow command value to the first flow command value when the temperature of the motor is equal to or lower than a predetermined temperature when the flow command value is the second flow command value. Furthermore, for example, the flow control may be a control in which, after the flow command value is switched to the second flow command value, the control device may switch the flow command value to the first flow command value based on both the temperature of the motor and the torque command value of the motor. In this case, for example, in the flow control, the control device may switch the flow command value from the second flow command value to the first flow command value when the temperature of the motor is equal to or lower than a predetermined temperature and the torque command value is equal to or lower than a predetermined value when the flow command value is the second flow command value.
　第１流量指令値は、モータの温度に基づいてどのように変動してもよい。第２流量指令値は、第１流量指令値以上であれば、どのような値であってもよい。第２流量指令値は、第１流量指令値の最大値より大きくてもよい。第２流量指令値は、一定の値でなく、変動する値であってもよい。この場合、流量制御において制御装置は、流量指令値が第２流量指令値である場合において、モータの温度に基づいて、第２流量指令値を変動させてもよい。 The first flow command value may vary in any manner based on the temperature of the motor. The second flow command value may be any value equal to or greater than the first flow command value. The second flow command value may be greater than the maximum value of the first flow command value. The second flow command value may not be a constant value, but may be a variable value. In this case, in flow control, when the flow command value is the second flow command value, the control device may vary the second flow command value based on the temperature of the motor.
　上述した制御装置が実行する流量制御を含む各制御は、デジタル回路およびアナログ回路を含むハードウェアによって実現される制御であってもよいし、ソフトウェアによって実現される制御、すなわち制御装置がプログラムを実行することで実現される制御であってもよいし、ハードウェアおよびソフトウェアによって実現される制御であってもよい。 Each control, including the flow control, performed by the control device described above may be control realized by hardware including digital circuits and analog circuits, or may be control realized by software, i.e., control realized by the control device executing a program, or may be control realized by hardware and software.
　冷却装置は、モータに冷媒を送る装置であれば、どのような装置であってもよい。冷却装置によってモータに送られる冷媒は、どのような冷媒であってもよい。冷媒は、オイルでなくてもよく、水であってもよい。 The cooling device may be any device that sends a refrigerant to the motor. The refrigerant sent to the motor by the cooling device may be any type of refrigerant. The refrigerant does not have to be oil and may be water.
　本発明が適用される駆動装置の用途は、特に限定されない。駆動装置は、例えば、車軸を回転させる用途以外の用途で車両に搭載されてもよいし、車両以外の機器に搭載されてもよい。 The use of the drive unit to which the present invention is applied is not particularly limited. For example, the drive unit may be mounted on a vehicle for a purpose other than rotating an axle, or may be mounted on equipment other than a vehicle.
　なお、本技術は以下のような構成をとることが可能である。（１）　モータと、前記モータに冷媒を送る冷却装置と、前記冷却装置を制御する制御装置と、を備え、前記制御装置は、前記モータの温度および前記モータのトルク指令値に基づいて前記冷却装置から前記モータに送られる前記冷媒の流量を制御する流量制御を実行可能であり、前記流量制御において前記制御装置は、前記冷却装置に入力する流量指令値を、前記モータの温度に基づいて変動する第１流量指令値と、前記第１流量指令値以上の第２流量指令値と、に切り替え可能であり、かつ、前記流量指令値が前記第１流量指令値である場合において、前記トルク指令値が第１トルク指令値以上となった場合に、前記流量指令値を前記第１流量指令値から前記第２流量指令値に切り替える、駆動装置。（２）　前記流量制御において前記制御装置は、前記流量指令値が前記第２流量指令値である場合において、前記トルク指令値が第２トルク指令値以下である場合に、前記流量指令値を前記第２流量指令値から前記第１流量指令値に切り替える、（１）に記載の駆動装置。
（３）　前記第２トルク指令値は、前記第１トルク指令値よりも小さい、（２）に記載の駆動装置。（４）　前記流量制御において前記制御装置は、前記流量指令値が前記第２流量指令値である場合において、前記トルク指令値が前記第２トルク指令値以下である状態が所定時間以上続いた場合に、前記流量指令値を前記第２流量指令値から前記第１流量指令値に切り替える、（２）または（３）に記載の駆動装置。（５）　前記モータの温度が第１温度よりも低い場合の前記第１流量指令値は、前記モータの温度が前記第１温度以上である場合の前記第１流量指令値よりも小さく、前記第２流量指令値は、前記モータの温度が前記第１温度よりも低い場合の前記第１流量指令値よりも大きい、（１）から（４）のいずれか一項に記載の駆動装置。（６）　前記第２流量指令値は、前記モータの温度が前記第１温度以上である場合の前記第１流量指令値と同じ値であり、前記第１流量指令値の最大値と同じ値である、（５）に記載の駆動装置。（７）　前記制御装置は、前記モータの温度が前記第１温度よりも低い第２温度以上である場合に前記流量制御を実行する、（５）または（６）に記載の駆動装置。（８）
　前記モータの温度が前記第２温度よりも低い場合における前記第１流量指令値は、前記第１流量指令値の最小値である、（７）に記載の駆動装置。（９）　モータに冷媒を送る冷却装置の制御方法であって、前記モータの温度および前記モータのトルク指令値に基づいて前記冷却装置から前記モータに送られる前記冷媒の流量を制御する流量制御を含み、前記流量制御は、前記冷却装置に入力する流量指令値が前記モータの温度に基づいて変動する第１流量指令値である場合において、前記トルク指令値が第１トルク指令値以上となった場合に、前記流量指令値を前記第１流量指令値から前記第１流量指令値以上の第２流量指令値に切り替えることを含む、冷却装置の制御方法。（１０）　前記流量制御は、前記流量指令値が前記第２流量指令値である場合において、前記トルク指令値が第２トルク指令値以下である場合に、前記流量指令値を前記第２流量指令値から前記第１流量指令値に切り替えることを含み、前記第２トルク指令値は、前記第１トルク指令値よりも小さい、（９）に記載の冷却装置の制御方法。（１１）　前記流量制御は、前記流量指令値が前記第２流量指令値である場合において、前記トルク指令値が前記第２トルク指令値以下である状態が所定時間以上続いた場合に、前記流量指令値を前記第２流量指令値から前記第１流量指令値に切り替えることを含む、（１０）に記載の冷却装置の制御方法。（１２）　前記モータの温度が第１温度よりも低い場合の前記第１流量指令値は、前記モータの温度が前記第１温度以上である場合の前記第１流量指令値よりも小さく、前記第２流量指令値は、前記モータの温度が前記第１温度よりも低い場合の前記第１流量指令値よりも大きい、（９）から（１１）のいずれか一項に記載の冷却装置の制御方法。（１３）　前記第２流量指令値は、前記モータの温度が前記第１温度以上である場合の前記第１流量指令値と同じ値であり、前記第１流量指令値の最大値と同じ値である、（１２）に記載の冷却装置の制御方法。（１４）　前記モータの温度が前記第１温度よりも低い第２温度以上である場合に前記流量制御を実行する、（１２）または（１３）に記載の冷却装置の制御方法。（１５）　前記モータの温度が前記第２温度よりも低い場合における前記第１流量指令値は、前記第１流量指令値の最小値である、（１４）に記載の冷却装置の制御方法。 The present technology may be configured as follows: (1) A drive device including a motor, a cooling device that sends a refrigerant to the motor, and a control device that controls the cooling device, the control device being capable of executing flow control for controlling a flow rate of the refrigerant sent from the cooling device to the motor based on a temperature of the motor and a torque command value of the motor, the control device being capable of switching a flow command value input to the cooling device between a first flow command value that varies based on the temperature of the motor and a second flow command value that is equal to or greater than the first flow command value in the flow control, and switching the flow command value from the first flow command value to the second flow command value when the torque command value becomes equal to or greater than the first torque command value when the flow command value is the first flow command value. (2) The drive device according to (1), wherein in the flow control, the control device being capable of switching the flow command value from the second flow command value to the first flow command value when the torque command value is equal to or less than the second torque command value when the flow command value is the second flow command value.
(3) The drive device according to (2), in which the second torque command value is smaller than the first torque command value. (4) The drive device according to (2) or (3), in which, in the flow control, when the flow command value is the second flow command value, the control device switches the flow command value from the second flow command value to the first flow command value if a state in which the torque command value is equal to or smaller than the second torque command value continues for a predetermined time or more. (5) The drive device according to any one of (1) to (4), in which the first flow command value when the temperature of the motor is lower than a first temperature is smaller than the first flow command value when the temperature of the motor is equal to or larger than the first temperature, and the second flow command value is larger than the first flow command value when the temperature of the motor is lower than the first temperature. (6) The drive device according to (5), in which the second flow command value is the same value as the first flow command value when the temperature of the motor is equal to or larger than the first temperature, and is the same value as a maximum value of the first flow command value. (7) The drive device according to (5) or (6), wherein the control device executes the flow rate control when the temperature of the motor is equal to or higher than a second temperature that is lower than the first temperature.
The drive device according to (7), wherein the first flow rate command value is a minimum value of the first flow rate command value when the temperature of the motor is lower than the second temperature. (9) A control method for a cooling device that supplies a refrigerant to a motor, comprising flow rate control for controlling a flow rate of the refrigerant sent from the cooling device to the motor based on a temperature of the motor and a torque command value of the motor, the flow rate control comprising, when a flow rate command value input to the cooling device is a first flow rate command value that varies based on the temperature of the motor, switching the flow rate command value from the first flow rate command value to a second flow rate command value that is equal to or greater than the first flow rate command value when the torque command value becomes equal to or greater than the first torque command value. (10) The control method for a cooling device according to (9), wherein the flow rate control comprises, when the flow rate command value is the second flow rate command value, switching the flow rate command value from the second flow rate command value to the first flow rate command value when the torque command value is equal to or less than the second torque command value, the second torque command value being smaller than the first torque command value. (11) The method for controlling a cooling device according to (10), wherein the flow control includes switching the flow command value from the second flow command value to the first flow command value when the torque command value continues to be equal to or lower than the second torque command value for a predetermined period of time or more when the flow command value is the second flow command value. (12) The method for controlling a cooling device according to any one of (9) to (11), wherein the first flow command value when the temperature of the motor is lower than a first temperature is smaller than the first flow command value when the temperature of the motor is equal to or higher than the first temperature, and the second flow command value is larger than the first flow command value when the temperature of the motor is lower than the first temperature. (13) The method for controlling a cooling device according to (12), wherein the second flow command value is the same value as the first flow command value when the temperature of the motor is equal to or higher than the first temperature, and is the same value as a maximum value of the first flow command value. (14) The method for controlling a cooling device according to (12) or (13), wherein the flow control is executed when the temperature of the motor is equal to or higher than a second temperature lower than the first temperature. (15) The method for controlling a cooling device according to (14), wherein the first flow rate command value when the temperature of the motor is lower than the second temperature is a minimum value of the first flow rate command value.
　以上、本明細書において説明した構成および方法は、相互に矛盾しない範囲内において、適宜組み合わせることができる。 The configurations and methods described in this specification can be combined as appropriate within the limits of not being mutually inconsistent.

Claims (15)

  1. 　モータと、
    　前記モータに冷媒を送る冷却装置と、
    　前記冷却装置を制御する制御装置と、
    　を備え、
    　前記制御装置は、前記モータの温度および前記モータのトルク指令値に基づいて前記冷却装置から前記モータに送られる前記冷媒の流量を制御する流量制御を実行可能であり、
    　前記流量制御において前記制御装置は、
    　　前記冷却装置に入力する流量指令値を、前記モータの温度に基づいて変動する第１流量指令値と、前記第１流量指令値以上の第２流量指令値と、に切り替え可能であり、かつ、
    　　前記流量指令値が前記第１流量指令値である場合において、前記トルク指令値が第１トルク指令値以上となった場合に、前記流量指令値を前記第１流量指令値から前記第２流量指令値に切り替える、駆動装置。     A motor;
    a cooling device for supplying a refrigerant to the motor;
    A control device for controlling the cooling device;
    Equipped with
    the control device is capable of executing flow rate control for controlling a flow rate of the refrigerant sent from the cooling device to the motor based on a temperature of the motor and a torque command value of the motor;
    In the flow rate control, the control device
    A flow rate command value input to the cooling device is switchable between a first flow rate command value that varies based on a temperature of the motor and a second flow rate command value that is equal to or greater than the first flow rate command value, and
    a drive device that switches the flow rate command value from the first flow rate command value to the second flow rate command value when the torque command value becomes equal to or greater than the first torque command value while the flow rate command value is the first flow rate command value.
  2. 　前記流量制御において前記制御装置は、前記流量指令値が前記第２流量指令値である場合において、前記トルク指令値が第２トルク指令値以下である場合に、前記流量指令値を前記第２流量指令値から前記第１流量指令値に切り替える、請求項１に記載の駆動装置。 The drive device according to claim 1, wherein in the flow control, when the flow command value is the second flow command value and the torque command value is equal to or less than the second torque command value, the control device switches the flow command value from the second flow command value to the first flow command value.
  3. 　前記第２トルク指令値は、前記第１トルク指令値よりも小さい、請求項２に記載の駆動装置。 The drive device of claim 2, wherein the second torque command value is smaller than the first torque command value.
  4. 　前記流量制御において前記制御装置は、前記流量指令値が前記第２流量指令値である場合において、前記トルク指令値が前記第２トルク指令値以下である状態が所定時間以上続いた場合に、前記流量指令値を前記第２流量指令値から前記第１流量指令値に切り替える、請求項３に記載の駆動装置。 The drive device according to claim 3, wherein in the flow control, when the flow command value is the second flow command value, if the torque command value remains equal to or less than the second torque command value for a predetermined period of time or more, the control device switches the flow command value from the second flow command value to the first flow command value.
  5. 　前記モータの温度が第１温度よりも低い場合の前記第１流量指令値は、前記モータの温度が前記第１温度以上である場合の前記第１流量指令値よりも小さく、
    　前記第２流量指令値は、前記モータの温度が前記第１温度よりも低い場合の前記第１流量指令値よりも大きい、請求項１から４のいずれか一項に記載の駆動装置。     the first flow rate command value when the temperature of the motor is lower than a first temperature is smaller than the first flow rate command value when the temperature of the motor is equal to or higher than the first temperature;
    The drive device according to claim 1 , wherein the second flow rate command value is greater than the first flow rate command value when a temperature of the motor is lower than the first temperature.
  6. 　前記第２流量指令値は、前記モータの温度が前記第１温度以上である場合の前記第１流量指令値と同じ値であり、前記第１流量指令値の最大値と同じ値である、請求項５に記載の駆動装置。 The drive device according to claim 5, wherein the second flow command value is the same as the first flow command value when the temperature of the motor is equal to or higher than the first temperature, and is the same as the maximum value of the first flow command value.
  7. 　前記制御装置は、前記モータの温度が前記第１温度よりも低い第２温度以上である場合に前記流量制御を実行する、請求項５に記載の駆動装置。 The drive device according to claim 5, wherein the control device executes the flow control when the temperature of the motor is equal to or higher than a second temperature that is lower than the first temperature.
  8. 　前記モータの温度が前記第２温度よりも低い場合における前記第１流量指令値は、前記第１流量指令値の最小値である、請求項７に記載の駆動装置。 The drive device according to claim 7, wherein the first flow command value when the temperature of the motor is lower than the second temperature is the minimum value of the first flow command value.
  9. 　モータに冷媒を送る冷却装置の制御方法であって、
    　前記モータの温度および前記モータのトルク指令値に基づいて前記冷却装置から前記モータに送られる前記冷媒の流量を制御する流量制御を含み、
    　前記流量制御は、前記冷却装置に入力する流量指令値が前記モータの温度に基づいて変動する第１流量指令値である場合において、前記トルク指令値が第１トルク指令値以上となった場合に、前記流量指令値を前記第１流量指令値から前記第１流量指令値以上の第２流量指令値に切り替えることを含む、冷却装置の制御方法。     1. A method for controlling a cooling device that supplies a refrigerant to a motor, comprising:
    a flow rate control for controlling a flow rate of the refrigerant sent from the cooling device to the motor based on a temperature of the motor and a torque command value of the motor;
    The flow control method for a cooling device includes, when a flow command value input to the cooling device is a first flow command value that varies based on a temperature of the motor, switching the flow command value from the first flow command value to a second flow command value that is equal to or greater than the first flow command value when the torque command value becomes equal to or greater than the first torque command value.
  10. 　前記流量制御は、前記流量指令値が前記第２流量指令値である場合において、前記トルク指令値が第２トルク指令値以下である場合に、前記流量指令値を前記第２流量指令値から前記第１流量指令値に切り替えることを含み、
    　前記第２トルク指令値は、前記第１トルク指令値よりも小さい、請求項９に記載の冷却装置の制御方法。     the flow rate control includes, when the flow rate command value is the second flow rate command value, switching the flow rate command value from the second flow rate command value to the first flow rate command value when the torque command value is equal to or less than a second torque command value;
    The method of claim 9 , wherein the second torque command value is smaller than the first torque command value.
  11. 　前記流量制御は、前記流量指令値が前記第２流量指令値である場合において、前記トルク指令値が前記第２トルク指令値以下である状態が所定時間以上続いた場合に、前記流量指令値を前記第２流量指令値から前記第１流量指令値に切り替えることを含む、請求項１０に記載の冷却装置の制御方法。 The cooling device control method according to claim 10, wherein the flow control includes switching the flow command value from the second flow command value to the first flow command value when the torque command value remains equal to or less than the second torque command value for a predetermined period of time or more when the flow command value is the second flow command value.
  12. 　前記モータの温度が第１温度よりも低い場合の前記第１流量指令値は、前記モータの温度が前記第１温度以上である場合の前記第１流量指令値よりも小さく、
    　前記第２流量指令値は、前記モータの温度が前記第１温度よりも低い場合の前記第１流量指令値よりも大きい、請求項９から１１のいずれか一項に記載の冷却装置の制御方法。     the first flow rate command value when the temperature of the motor is lower than a first temperature is smaller than the first flow rate command value when the temperature of the motor is equal to or higher than the first temperature;
    The method for controlling a cooling device according to claim 9 , wherein the second flow rate command value is greater than the first flow rate command value when a temperature of the motor is lower than the first temperature.
  13. 　前記第２流量指令値は、前記モータの温度が前記第１温度以上である場合の前記第１流量指令値と同じ値であり、前記第１流量指令値の最大値と同じ値である、請求項１２に記載の冷却装置の制御方法。 The cooling device control method according to claim 12, wherein the second flow command value is the same as the first flow command value when the temperature of the motor is equal to or higher than the first temperature, and is the same as the maximum value of the first flow command value.
  14. 　前記モータの温度が前記第１温度よりも低い第２温度以上である場合に前記流量制御を実行する、請求項１２に記載の冷却装置の制御方法。 The method for controlling a cooling device according to claim 12, wherein the flow control is performed when the temperature of the motor is equal to or higher than a second temperature that is lower than the first temperature.
  15. 　前記モータの温度が前記第２温度よりも低い場合における前記第１流量指令値は、前記第１流量指令値の最小値である、請求項１４に記載の冷却装置の制御方法。 The method for controlling a cooling device according to claim 14, wherein the first flow command value when the temperature of the motor is lower than the second temperature is the minimum value of the first flow command value.
PCT/JP2023/040689 2022-11-15 2023-11-13 Drive device, and method for controlling cooling device WO2024106361A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006074962A (en) * 2004-09-06 2006-03-16 Nissan Motor Co Ltd Motor cooler
JP2006187105A (en) * 2004-12-27 2006-07-13 Nissan Motor Co Ltd Cooling device for rotary electric machine
JP2013198378A (en) * 2012-03-22 2013-09-30 Mitsubishi Motors Corp Electric motor
JP2020200900A (en) * 2019-06-11 2020-12-17 株式会社ミツバ Clutch engagement electric oil pump of transmission of automobile, clutch engagement electric oil pump control method of transmission of automobile and clutch engagement vehicle electric oil pump of transmission of vehicle and automobile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006074962A (en) * 2004-09-06 2006-03-16 Nissan Motor Co Ltd Motor cooler
JP2006187105A (en) * 2004-12-27 2006-07-13 Nissan Motor Co Ltd Cooling device for rotary electric machine
JP2013198378A (en) * 2012-03-22 2013-09-30 Mitsubishi Motors Corp Electric motor
JP2020200900A (en) * 2019-06-11 2020-12-17 株式会社ミツバ Clutch engagement electric oil pump of transmission of automobile, clutch engagement electric oil pump control method of transmission of automobile and clutch engagement vehicle electric oil pump of transmission of vehicle and automobile

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