CN117345844A - Transmission cooling system, control method of transmission cooling system, and vehicle - Google Patents
Transmission cooling system, control method of transmission cooling system, and vehicle Download PDFInfo
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- CN117345844A CN117345844A CN202210751887.2A CN202210751887A CN117345844A CN 117345844 A CN117345844 A CN 117345844A CN 202210751887 A CN202210751887 A CN 202210751887A CN 117345844 A CN117345844 A CN 117345844A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 307
- 238000001816 cooling Methods 0.000 title claims abstract description 164
- 238000000034 method Methods 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 97
- 239000000110 cooling liquid Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims description 66
- 230000006870 function Effects 0.000 claims description 34
- 238000004590 computer program Methods 0.000 claims description 21
- 238000012545 processing Methods 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000001174 ascending effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000017525 heat dissipation Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0412—Cooling or heating; Control of temperature
- F16H57/0415—Air cooling or ventilation; Heat exchangers; Thermal insulations
- F16H57/0417—Heat exchangers adapted or integrated in the gearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0412—Cooling or heating; Control of temperature
- F16H57/0413—Controlled cooling or heating of lubricant; Temperature control therefor
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- General Engineering & Computer Science (AREA)
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- General Details Of Gearings (AREA)
Abstract
The invention provides a transmission cooling system, a control method of the transmission cooling system and a vehicle. The transmission cooling system includes: the low-temperature radiator, the cooling fan, the heat exchange pipeline, the electric drive water pump, the transmission motor and the transmission oil cooler; the low-temperature radiator, the electric drive water pump, the transmission motor and the transmission oil cooler are sequentially connected in series through a heat exchange pipeline to form a cooling circulation loop of the transmission; the cooling fan is used for cooling the cooling liquid in the heat exchange pipeline so as to cool the transmission motor and the oil liquid of the transmission through the cooling liquid. The invention can reduce the arrangement length and space of the heat exchange pipeline, has good cooling effect and small energy loss, and is beneficial to the efficient operation of the transmission.
Description
Technical Field
The invention relates to the technical field of vehicle heat dissipation, in particular to a transmission cooling system, a control method of the transmission cooling system and a vehicle.
Background
Variators are mechanisms for varying rotational speed and torque from an engine, and are typically composed of a variable speed drive and an operating mechanism, some of which also include a power take-off mechanism. The transmission can fix or change the transmission ratio of an output shaft and an input shaft in a stepping way, is also called a gearbox, and is an important component part on an automobile. Wherein, cooling the derailleur and dispelling the heat is favorable to the better work of derailleur.
Currently, existing transmission cooling systems typically require a separate radiator or a radiator that is common to the engine. However, this results in more cooling lines required for the cooling system, larger arrangement space required, poorer cooling effect, and larger energy loss, which is detrimental to efficient operation of the transmission.
Disclosure of Invention
The embodiment of the invention provides a transmission cooling system, a control method of the transmission cooling system and a vehicle, which are used for solving the problems that the existing transmission cooling system is poor in cooling effect and is unfavorable for efficient operation of a transmission.
In a first aspect, an embodiment of the present invention provides a transmission cooling system comprising: the low-temperature radiator, the cooling fan, the heat exchange pipeline, the electric drive water pump, the transmission motor and the transmission oil cooler;
the low-temperature radiator, the electric drive water pump, the transmission motor and the transmission oil cooler are sequentially connected in series through the heat exchange pipeline to form a cooling circulation loop of the transmission;
the cooling fan is used for cooling the cooling liquid in the heat exchange pipeline so as to cool the transmission motor and the oil liquid of the transmission through the cooling liquid.
In a second aspect, an embodiment of the present invention provides a control method of a transmission cooling system, where the transmission cooling system is the transmission cooling system described in the first aspect, and the control method includes:
Acquiring the transmission oil temperature, and acquiring the change trend of the transmission oil temperature according to the transmission oil temperature;
judging whether the change trend is a preset trend or not and whether the transmission oil temperature belongs to a preset temperature interval or not;
and if the change trend is the preset trend and the transmission oil temperature is in the preset temperature range, adjusting the duty ratio of the electric drive water pump to the preset water pump duty ratio, and adjusting the rotating speed duty ratio of the cooling fan to the preset rotating speed duty ratio.
In one possible implementation manner, the preset trend includes a temperature upward trend or a temperature downward trend;
judging whether the change trend is a preset trend or not and whether the transmission oil temperature belongs to a preset temperature interval or not comprises the following steps:
judging whether the change trend is the temperature upward trend or the temperature downward trend;
if the change trend is the temperature uplink trend, acquiring a first duty ratio adjustment table corresponding to the temperature uplink trend, and judging whether the transmission oil temperature belongs to any first preset temperature interval in the first duty ratio adjustment table; the first duty ratio adjustment table comprises a plurality of first preset temperature intervals, a first preset water pump duty ratio of the electric drive water pump corresponding to each first preset temperature interval and a first preset rotating speed duty ratio corresponding to the cooling fan;
If the change trend is the temperature downlink trend, acquiring a second duty ratio adjustment table corresponding to the temperature downlink trend, and judging whether the transmission oil temperature belongs to any second preset temperature interval in the second duty ratio adjustment table; the second duty ratio adjustment table comprises a plurality of second preset temperature intervals, second preset water pump duty ratios of the electric drive water pumps corresponding to the second preset temperature intervals and second preset rotating speed duty ratios of the cooling fans.
In one possible implementation manner, if the trend of change is the preset trend and the transmission oil temperature belongs to the preset temperature interval, the step of adjusting the duty ratio of the electric drive water pump to a preset water pump duty ratio and the step of adjusting the rotation speed duty ratio of the cooling fan to a preset rotation speed duty ratio includes:
if the change trend is the temperature ascending trend and the transmission oil temperature belongs to any first preset temperature interval in the first duty cycle adjustment table, the duty cycle of the electric drive water pump is adjusted to a first preset water pump duty cycle corresponding to the first preset temperature interval, and the rotating speed duty cycle of the cooling fan is adjusted to a first preset rotating speed duty cycle corresponding to the first preset temperature interval;
And if the change trend is the downward trend of the temperature and the oil temperature of the transmission belongs to any second preset temperature interval in the second duty cycle adjustment table, adjusting the duty cycle of the electric drive water pump to a second preset water pump duty cycle corresponding to the second preset temperature interval, and adjusting the rotating speed duty cycle of the cooling fan to a second preset rotating speed duty cycle corresponding to the second preset temperature interval.
In one possible implementation, after acquiring the transmission oil temperature, before acquiring the trend of the transmission oil temperature according to the transmission oil temperature, the method further includes: detecting whether a transmission cooling function is activated;
obtaining a trend of change in transmission oil temperature from the transmission oil temperature, comprising:
and if the transmission cooling function is activated, obtaining the change trend of the transmission oil temperature according to the transmission oil temperature.
In one possible implementation, the detecting whether the transmission cooling function is activated includes:
acquiring the working mode of a vehicle in which the transmission cooling system is positioned and high-voltage power-on and power-off information;
and if the working mode is a driving mode, the high-voltage power-on and power-off information represents that the high-voltage power-on is completed, and the transmission oil Wen Dayu is at a first preset oil temperature, determining that the transmission cooling function is activated.
In one possible implementation, after adjusting the duty cycle of the electric drive water pump to a preset water pump duty cycle and adjusting the rotational speed duty cycle of the cooling fan to a preset rotational speed duty cycle, the method further includes:
detecting whether a transmission cooling function is exited or not according to the working mode of a vehicle in which the transmission cooling system is located, high-voltage power-on and power-off information or the regulated transmission oil temperature;
and if the working mode is a charging mode, or the high-voltage power-on and power-off information represents that the high-voltage power-off is completed, or the regulated transmission oil temperature is smaller than a second preset oil temperature, judging that the transmission cooling function is exited.
In a third aspect, an embodiment of the present invention provides a control apparatus for a transmission cooling system, including:
the acquisition module is used for acquiring the oil temperature of the transmission and acquiring the change trend of the oil temperature of the transmission according to the oil temperature of the transmission;
the processing module is used for judging whether the change trend is a preset trend or not and whether the transmission oil temperature belongs to a preset temperature interval or not;
and the adjusting module is used for adjusting the duty ratio of the electric drive water pump to a preset water pump duty ratio and adjusting the rotating speed duty ratio of the cooling fan to a preset rotating speed duty ratio if the change trend is the preset trend and the oil temperature of the transmission belongs to the preset temperature interval.
In a fourth aspect, an embodiment of the present invention provides a vehicle comprising a controller, the controller comprising a memory for storing a computer program and a processor for calling and running the computer program stored in the memory to perform the steps of the method as described above in any one of the possible implementations of the second aspect or of the second aspect.
In a fifth aspect, embodiments of the present invention provide a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method of the second aspect or any one of the possible implementations of the second aspect.
The embodiment of the invention provides a transmission cooling system, a control method of the transmission cooling system and a vehicle, wherein the transmission cooling system is sequentially connected in series through a low-temperature radiator, an electric drive water pump, a transmission motor and a transmission oil cooler through heat exchange pipelines to form a cooling circulation loop of a transmission; and cooling the cooling liquid in the heat exchange pipeline by a cooling fan so as to cool the transmission motor and the oil of the transmission by the cooling liquid. The low-temperature radiator capable of radiating heat based on the control motor radiates heat to oil liquid of the transmission and the transmission motor simultaneously, compared with a transmission cooling system formed by an independent radiator or a radiator shared by the transmission and the engine, the low-temperature radiator can reduce the arrangement length and the space of a heat exchange pipeline, has good cooling effect and small energy loss, and is beneficial to efficient operation of the transmission.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a transmission cooling system provided in an embodiment of the present invention;
FIG. 2 is a flow chart of an implementation of a method of controlling a transmission cooling system provided by an embodiment of the present invention;
FIG. 3 is a flowchart of an implementation of a method of controlling a transmission cooling system provided by another embodiment of the present invention;
FIG. 4 is a schematic diagram of a control device for a transmission cooling system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a controller according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.
As shown in fig. 1, a transmission cooling system 100 according to an embodiment of the present invention includes: a low temperature radiator 101, a cooling fan (not shown), a heat exchange line 102, an electric drive water pump 103, a transmission motor 104, and a transmission oil cooler 105.
Wherein the low-temperature radiator 101, the electric drive water pump 103, the transmission motor 104 and the transmission oil cooler 105 are sequentially connected in series through the heat exchange pipeline 102 to form a cooling circulation loop of the transmission 106. The invention connects the low-temperature radiator 101, the electric drive water pump 103, the transmission motor 104 and the transmission oil cooler 105 in series, improves the radiating efficiency of the invention, also makes the structure of the transmission cooling system simpler, facilitates the later maintenance and also facilitates the whole vehicle arrangement.
The cooling fan is used for cooling the cooling liquid in the heat exchange pipeline 102, so that the cooling liquid is used for cooling oil of the transmission motor 104 and the transmission 106.
The cooling fan may be disposed on one side of the low-temperature radiator, or may be disposed at another position as needed, and the specific position of the cooling fan is not limited in this embodiment.
According to the transmission cooling system, the transmission oil cooler is connected between the motor and the low-temperature radiator in series, the low-temperature radiator capable of radiating heat based on the control motor can radiate heat to oil liquid of the transmission and the transmission motor, compared with the transmission cooling system formed by an independent radiator or a radiator shared by the transmission oil cooler and the engine, the transmission cooling system can reduce the arrangement length and the space of a heat exchange pipeline, is good in cooling effect, small in energy loss and beneficial to efficient operation of the transmission.
Optionally, referring to fig. 1, an electric drive circuit water temperature sensor 107 may also be provided on the heat exchange line 102 near the outlet of the low temperature radiator 101 to monitor the temperature of the coolant flowing from the low temperature radiator 101.
Optionally, referring to fig. 1, the electric drive water pump 103 and the transmission motor 104 may be connected through an interface c and an interface b of the first electric drive three-way valve 108, and the interface b of the first electric drive three-way valve 108 and the transmission motor 104 may be further connected in series with the P2 motor controller 109, so as to simultaneously dissipate heat to the transmission motor 104 and the P2 motor controller 109 through the low-temperature radiator 101.
Alternatively, referring to FIG. 1, the transmission motor 104 may be connected to the low temperature radiator 101 through a transmission oil cooler 105, an interface b and an interface c of a second electrically-driven three-way valve 110. The transmission motor 104 may also be directly connected to the low temperature radiator 101 through the interfaces a and c of the second electrically driven three-way valve 110. Therefore, when the transmission motor 104 needs to dissipate heat, but the oil of the transmission 106 does not need to dissipate heat, the interface c and the interface a of the second electrically-driven three-way valve 110 can be communicated, so that only the transmission motor 104 is dissipated, and the heat dissipation efficiency is improved. Or when the transmission motor 104 needs to dissipate heat and the oil of the transmission also needs to dissipate heat, the interface c of the second electrically-driven three-way valve 110 may be communicated with the interface b, or the interface c of the second electrically-driven three-way valve 110 may be respectively communicated with the interface a and the interface b, so as to dissipate heat of the oil of the transmission motor 104 and the oil of the transmission 106 at the same time.
Optionally, the interface a of the first electrically driven three-way valve 108 may be sequentially connected to the autopilot sensor 113, the on-vehicle device 112, the other motor 111, and the inlet of the low-temperature radiator 101 through a heat exchange pipeline to form a cooling circulation loop of the other motor 111, and when the other motor 111 needs to dissipate heat, the interface c of the first electrically driven three-way valve 108 is connected to the interface a to dissipate heat from the other motor 111 through the low-temperature radiator. In the present invention, the in-vehicle device 112 includes a DC/DC converter and an in-vehicle charger.
In one embodiment of the present invention, the transmission controller TCU recognizes the transmission oil temperature by detecting the oil passage temperature sensor, and calculates the oil temperature change rate; the calculation formula and the description are as follows: temperature change rate=Δt/Δt, for example: delta T-2 s, delta T-2 s. The temperature change rate is 0 before the first calculation, and the last calculation result is updated after each calculation is completed.
The transmission motor 104 may be a P2 motor, and the other motor 111 may be a P4 motor, so that the transmission cooling system according to the embodiment of the invention is convenient for radiating the hybrid drive special transmission of the hybrid electric vehicle, and has the advantages of small heat exchange pipeline arrangement length and required space, good cooling effect and contribution to reducing the cost of the whole vehicle while preventing the operation temperature of the hybrid drive special transmission from being too high.
Referring to fig. 2, a flowchart of an implementation method of a transmission cooling system according to an embodiment of the present invention is shown, and the details are as follows:
in step 201, a transmission oil temperature is acquired, and a trend of change in the transmission oil temperature is obtained from the transmission oil temperature.
The transmission oil temperature refers to the temperature of oil in the transmission. The transmission oil temperature is obtained, so that on one hand, whether the transmission oil liquid needs to be radiated (namely, whether a transmission cooling function needs to be activated) or not can be determined, and on the other hand, how to radiate the heat can be determined based on the transmission oil temperature, so that the heat of the transmission can be radiated more accurately.
Wherein, according to the change trend of the transmission oil temperature obtained by the transmission oil temperature, the change trend of the transmission oil temperature can be directly obtained by utilizing the difference between the transmission oil temperature obtained at the current moment and the transmission oil temperature obtained at the last moment. The change trend of the transmission oil temperature can also be obtained by utilizing the transmission oil temperature obtained at the current moment and a plurality of transmission oil temperatures obtained before, so that the obtained transmission oil temperature is more accurate.
Alternatively, after the transmission oil temperature is acquired, before the trend of the change in the transmission oil temperature is obtained from the transmission oil temperature, it is also possible to detect whether the transmission cooling function is activated.
Wherein, the change trend of the transmission oil temperature is obtained according to the transmission oil temperature, which can include: if the transmission cooling function is activated, a trend of change in the transmission oil temperature is obtained from the transmission oil temperature.
In the present embodiment, after the transmission oil temperature is acquired, if it can be determined that the transmission cooling function is activated, the trend of change in the transmission oil temperature can be further obtained from the transmission oil temperature. If the transmission cooling function is not activated, no subsequent processing, that is, processing to obtain a trend of change in the transmission oil temperature from the transmission oil temperature, is necessary.
Optionally, detecting whether the transmission cooling function is activated may include:
and acquiring the working mode of the vehicle in which the transmission cooling system is positioned and the high-voltage power-on and power-off information.
If the operating mode of the vehicle in which the transmission cooling system is located is a driving mode, and the high-voltage on-off electrical information characterizes that the high-voltage on-electricity is completed, and the transmission oil Wen Dayu is the first preset oil temperature, the transmission cooling function is determined to be activated.
In this embodiment, the working mode of the vehicle, the high-voltage power-on and power-off information and the transmission oil temperature are considered at the same time, and when the condition that the vehicle is in the driving mode, the high-voltage power-on is completed and the first preset oil temperature of the transmission oil Wen Dayu is met at the same time, the activation of the cooling function of the transmission is judged, and the misjudgment that only a single condition is considered may be avoided.
The first preset oil temperature can be determined through calibration. The first preset oil temperature may be 85 deg.c, for example.
Optionally, after adjusting the duty ratio of the electric drive water pump to a preset water pump duty ratio and adjusting the rotational speed duty ratio of the cooling fan to a preset rotational speed duty ratio, the method may further include:
and detecting whether the cooling function of the transmission is exited or not according to the working mode of the vehicle in which the cooling system of the transmission is positioned, high-voltage power-on and power-off information or the adjusted oil temperature of the transmission.
And if the working mode of the vehicle in which the transmission cooling system is positioned is a charging mode, or the high-voltage power-on and power-off information indicates that the high-voltage power-off is completed, or the adjusted transmission oil temperature is smaller than a second preset oil temperature, judging that the transmission cooling function is quitted.
In this embodiment, after the duty ratio of the electric drive water pump is adjusted to the preset water pump duty ratio and the rotational speed duty ratio of the cooling fan is adjusted to the preset rotational speed duty ratio, the oil temperature of the transmission may decrease. At this point it may be detected whether the transmission cooling function is exiting. The transmission cooling function may be determined to be exited when either the vehicle is in the charging mode, the high-voltage power down is completed, or the adjusted transmission oil temperature is less than a second preset oil temperature is satisfied.
According to practical situations, the vehicle is in a charging mode, namely the vehicle is in a DC charging mode, and the vehicle is also in an AC charging mode.
Likewise, the second preset oil temperature may also be determined by calibration. The second preset oil temperature may be, for example, 80 ℃.
In step 202, it is determined whether the trend is a predetermined trend and whether the transmission oil temperature belongs to a predetermined temperature range.
Alternatively, the preset trend may include a temperature upward trend or a temperature downward trend.
Referring to fig. 3, determining whether the trend of change is a preset trend and whether the transmission oil temperature belongs to a preset temperature interval may include:
in step 301, it is determined whether the trend is an upward trend or a downward trend.
In step 302, if the variation trend is an upward trend of temperature, a first duty cycle adjustment table corresponding to the upward trend of temperature is obtained, and it is determined whether the transmission oil temperature belongs to any one of the first preset temperature intervals in the first duty cycle adjustment table.
In step 303, if the variation trend is a downward temperature trend, a second duty ratio adjustment table corresponding to the downward temperature trend is obtained, and it is determined whether the transmission oil temperature belongs to any second preset temperature interval in the second duty ratio adjustment table.
The first duty ratio adjustment table comprises a plurality of first preset temperature intervals, first preset water pump duty ratios of the electric drive water pumps corresponding to the first preset temperature intervals and first preset rotating speed duty ratios corresponding to the cooling fans. The second duty ratio adjustment table comprises a plurality of second preset temperature intervals, second preset water pump duty ratios of the electric drive water pumps corresponding to the second preset temperature intervals and second preset rotating speed duty ratios corresponding to the cooling fans.
In the present embodiment, the upward trend of temperature is a trend of increasing the transmission oil temperature, and the downward trend of temperature is a trend of decreasing the transmission oil temperature.
For example, tables 1 and 2 may be acquired respectively to constitute a first duty adjustment table. As shown in table 1 and table 2, when the first duty cycle adjustment table corresponding to the upward trend of the temperature is set, the first preset water pump duty cycle and the first preset rotation speed duty cycle may be alternately increased along with the increase of the temperature corresponding to the first preset temperature interval. For example, at T <85 ℃, the corresponding first preset water pump duty cycle is 10% and the first preset rotational speed duty cycle is 10%. When T is more than or equal to 85 ℃ and less than 90 ℃, the corresponding first preset water pump duty ratio is 70%, and the first preset rotating speed duty ratio is 10%. When T is more than or equal to 90 ℃ and less than 95 ℃, the corresponding first preset water pump duty ratio is 70%, and the first preset rotating speed duty ratio is 40%. And by analogy, when a first duty ratio regulating table corresponding to the upward trend of the temperature is set, the duty ratio of the first preset water pump and the duty ratio of the first preset rotating speed are alternately increased along with the rising of the temperature, so that the oil liquid of the transmission can be radiated more accurately based on the oil temperature of the transmission, and the radiating effect is better.
TABLE 1
TABLE 2
Illustratively, tables 3 and 4 may be taken separately to form a second duty cycle adjustment table. As shown in table 3 and table 4, when the second duty ratio adjustment table corresponding to the downward trend of the temperature is set, the second preset water pump duty ratio and the second preset rotating speed duty ratio may be reduced simultaneously with the reduction of the temperature corresponding to the second preset temperature interval, and when the temperature is reduced to a certain temperature, the second preset water pump duty ratio and the second preset rotating speed duty ratio may be reduced alternately. In the process of reducing the oil temperature of the transmission from high temperature to relatively low temperature, the rapid heat dissipation is adjusted while the duty ratio of the second preset water pump and the duty ratio of the second preset rotating speed are adopted, and the precise heat dissipation is adjusted in an alternating mode through the duty ratio of the second preset water pump and the duty ratio of the second preset rotating speed.
For example, when T is more than or equal to 105 ℃, the corresponding second preset water pump duty cycle is 95%, and the second preset rotating speed duty cycle is 90%. When T is more than or equal to 95 ℃ and less than 105 ℃, the corresponding second preset water pump duty ratio is 85%, and the second preset rotating speed duty ratio is 60%. When T is more than or equal to 85 ℃ and less than 95 ℃, the corresponding second preset water pump duty ratio is 70%, and the second preset rotating speed duty ratio is 40%. When T is more than or equal to 80 ℃ and less than 85 ℃, the corresponding second preset water pump duty ratio is 70%, and the second preset rotating speed duty ratio is 10%. When T is less than 80 ℃, the corresponding second preset water pump duty ratio is 10%, and the second preset rotating speed duty ratio is 10%.
TABLE 3 Table 3
TABLE 4 Table 4
The above tables 1, 2, 3, and 4 are only used to illustrate the first duty cycle adjustment table and the second duty cycle adjustment table, which are specifically divided into a first preset temperature interval and a second preset temperature interval, and a first preset water pump duty cycle and a first preset rotation speed duty cycle corresponding to each first preset temperature interval, and a second preset water pump duty cycle and a second preset rotation speed duty cycle corresponding to each second preset temperature interval may be determined according to practical situations, which is not limited in this embodiment.
In step 203, if the trend is a preset trend and the transmission oil temperature is within a preset temperature range, the duty ratio of the electric drive water pump is adjusted to a preset water pump duty ratio, and the rotational speed duty ratio of the cooling fan is adjusted to a preset rotational speed duty ratio.
Optionally, if the variation trend is a preset trend and the transmission oil temperature belongs to a preset temperature interval, adjusting the duty ratio of the electric drive water pump to a preset water pump duty ratio and adjusting the rotational speed duty ratio of the cooling fan to a preset rotational speed duty ratio may include:
if the change trend is an upward trend of temperature and the transmission oil Wen Shuyu is in any first preset temperature interval in the first duty cycle adjustment table, the duty cycle of the electric drive water pump is adjusted to a first preset water pump duty cycle corresponding to the first preset temperature interval, and the rotating speed duty cycle of the cooling fan is adjusted to a first preset rotating speed duty cycle corresponding to the first preset temperature interval.
If the change trend is a temperature downlink trend and the transmission oil temperature belongs to any second preset temperature interval in the second duty cycle adjustment table, the duty cycle of the electric drive water pump is adjusted to a second preset water pump duty cycle corresponding to the second preset temperature interval, and the rotating speed duty cycle of the cooling fan is adjusted to a second preset rotating speed duty cycle corresponding to the second preset temperature interval.
According to the examples of tables 1, 2, 3, and 4 described above, if the change trend of the transmission oil temperature is the upward trend of the temperature, and the transmission oil temperature falls within the temperature range of 85 ℃ to T < 90 ℃, the duty ratio of the electric drive water pump can be adjusted to 70% and the rotational speed duty ratio of the cooling fan can be adjusted to 10%. If the change trend of the transmission oil temperature is a temperature descending trend and the transmission oil temperature belongs to a temperature range of 85 ℃ to less than or equal to T to less than 95 ℃, the duty ratio of the electric drive water pump can be adjusted to 70 percent, and the rotating speed duty ratio of the cooling fan can be adjusted to 40 percent.
The change trend of the transmission oil temperature and the change trend of the transmission oil temperature can be obtained through the transmission controller, and the duty ratio requirement (namely, the corresponding first preset water pump duty ratio or the corresponding second preset water pump duty ratio) and the cooling fan rotating speed requirement (namely, the corresponding first preset rotating speed duty ratio or the corresponding second preset rotating speed duty ratio) of the electric drive water pump are determined through the corresponding first duty ratio adjustment table or the corresponding second duty ratio adjustment table. The duty cycle demand of the electric drive pump (which may also be referred to as a duty cycle request signal of the electric drive pump) and the cooling fan rotational speed demand (which may also be referred to as a rotational speed request signal of the cooling fan) are then sent to a transmission controller, which controls the electric drive pump and the cooling fan to operate under the corresponding requested operating conditions.
According to the embodiment of the invention, a transmission cooling system is formed by sequentially connecting a low-temperature radiator, an electric drive water pump, a transmission motor and a transmission oil cooler in series through a heat exchange pipeline, the transmission oil temperature is obtained, the change trend of the transmission oil temperature is obtained according to the transmission oil temperature, then whether the change trend is a preset trend and whether the transmission oil temperature belongs to a preset temperature range is judged, when the change trend is the preset trend and the transmission oil temperature belongs to the preset temperature range, the duty ratio of the electric drive water pump is adjusted to the preset water pump duty ratio, and the rotating speed duty ratio of the cooling fan is adjusted to the preset rotating speed duty ratio. Compared with a transmission cooling system formed by an independent radiator or a radiator shared by the engine, the transmission cooling system has the advantages that the transmission cooling system is controlled by the transmission oil temperature and the change trend of the transmission oil temperature together while the arrangement length and the space of the heat exchange pipeline are reduced, the heat dissipation effect is good, the energy loss is small, and the efficient work of the transmission is facilitated.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
The following are device embodiments of the invention, for details not described in detail therein, reference may be made to the corresponding method embodiments described above.
Fig. 4 is a schematic structural view showing a control device of a transmission cooling system according to an embodiment of the present invention, which is applied to the transmission cooling system shown in fig. 1. For convenience of explanation, only the portions related to the embodiments of the present invention are shown, and the details are as follows:
as shown in fig. 4, the control device of the transmission cooling system includes: an acquisition module 41, a processing module 42 and an adjustment module 43.
An acquisition module 41 for acquiring a transmission oil temperature and acquiring a trend of change in the transmission oil temperature according to the transmission oil temperature;
the processing module 42 is configured to determine whether the variation trend is a preset trend and whether the transmission oil temperature belongs to a preset temperature range;
the adjusting module 43 is configured to adjust the duty ratio of the electric drive water pump to a preset water pump duty ratio and adjust the rotational speed duty ratio of the cooling fan to a preset rotational speed duty ratio if the change trend is a preset trend and the transmission oil temperature belongs to a preset temperature range.
According to the embodiment of the invention, a transmission cooling system is formed by sequentially connecting a low-temperature radiator, an electric drive water pump, a transmission motor and a transmission oil cooler in series through a heat exchange pipeline, the transmission oil temperature is obtained, the change trend of the transmission oil temperature is obtained according to the transmission oil temperature, then whether the change trend is a preset trend and whether the transmission oil temperature belongs to a preset temperature range is judged, when the change trend is the preset trend and the transmission oil temperature belongs to the preset temperature range, the duty ratio of the electric drive water pump is adjusted to the preset water pump duty ratio, and the rotating speed duty ratio of the cooling fan is adjusted to the preset rotating speed duty ratio. Compared with a transmission cooling system formed by an independent radiator or a radiator shared by the engine, the transmission cooling system has the advantages that the transmission cooling system is controlled by the transmission oil temperature and the change trend of the transmission oil temperature together while the arrangement length and the space of the heat exchange pipeline are reduced, the heat dissipation effect is good, the energy loss is small, and the efficient work of the transmission is facilitated.
In one possible implementation, the preset trend includes a temperature upward trend or a temperature downward trend; the processing module 42 may be configured to determine whether the variation trend is an upward temperature trend or a downward temperature trend; if the change trend is a temperature uplink trend, acquiring a first duty ratio adjustment table corresponding to the temperature uplink trend, and judging whether the oil temperature of the transmission belongs to any first preset temperature interval in the first duty ratio adjustment table; the first duty ratio adjustment table comprises a plurality of first preset temperature intervals, first preset water pump duty ratios of the electric drive water pumps corresponding to the first preset temperature intervals and first preset rotating speed duty ratios corresponding to the cooling fans; if the change trend is a temperature downlink trend, acquiring a second duty ratio adjustment table corresponding to the temperature downlink trend, and judging whether the oil temperature of the transmission belongs to any second preset temperature interval in the second duty ratio adjustment table; the second duty ratio adjustment table comprises a plurality of second preset temperature intervals, second preset water pump duty ratios of the electric drive water pumps corresponding to the second preset temperature intervals and second preset rotating speed duty ratios corresponding to the cooling fans.
In one possible implementation manner, the adjusting module 43 may be configured to adjust the duty cycle of the electric drive water pump to a first preset water pump duty cycle corresponding to a first preset temperature interval if the change trend is a temperature uplink trend and the transmission oil Wen Shuyu is in any first preset temperature interval in the first duty cycle adjusting table, and adjust the rotational speed duty cycle of the cooling fan to a first preset rotational speed duty cycle corresponding to the first preset temperature interval.
If the change trend is a temperature downlink trend and the transmission oil temperature belongs to any second preset temperature interval in the second duty cycle adjustment table, the duty cycle of the electric drive water pump is adjusted to a second preset water pump duty cycle corresponding to the second preset temperature interval, and the rotating speed duty cycle of the cooling fan is adjusted to a second preset rotating speed duty cycle corresponding to the second preset temperature interval.
In one possible implementation, the acquisition module 41 may also be used to detect whether the transmission cooling function is active; if the transmission cooling function is activated, a trend of change in the transmission oil temperature is obtained from the transmission oil temperature.
In one possible implementation, the obtaining module 41 may be further configured to obtain an operating mode of a vehicle in which the transmission cooling system is located, and high-voltage power-on/off information; if the operating mode is a driving mode, and the high-voltage power-on and power-off information indicates that the high-voltage power-on is completed, and the transmission oil Wen Dayu is a first preset oil temperature, the transmission cooling function is determined to be activated.
In one possible implementation, the acquisition module 41 may also be configured to detect whether the transmission cooling function is exiting based on the operating mode of the vehicle in which the transmission cooling system is located, the high-voltage power-on/off information, or the adjusted transmission oil temperature; and if the working mode is a charging mode, or the high-voltage power-on and power-off information represents that the high-voltage power-off is completed, or the regulated transmission oil temperature is smaller than a second preset oil temperature, judging that the transmission cooling function is quitted.
Fig. 5 is a schematic diagram of a controller according to an embodiment of the present invention. As shown in fig. 5, the controller 5 of this embodiment includes: a processor 50, a memory 51 and a computer program 52 stored in the memory 51 and executable on the processor 50. The processor 50, when executing the computer program 52, implements the steps of the control method embodiments of the respective transmission cooling systems described above, such as steps 201 to 203 shown in fig. 2, or steps 301 to 303 shown in fig. 3. Alternatively, the processor 50, when executing the computer program 52, performs the functions of the modules of the apparatus embodiments described above, such as the functions of the modules 41 to 43 shown in fig. 4.
By way of example, the computer program 52 may be partitioned into one or more modules/units, which are stored in the memory 51 and executed by the processor 50 to complete the present invention. One or more of the modules/units may be a series of computer program instruction segments capable of performing a specific function, which instruction segments are used to describe the execution of the computer program 52 in the controller 5. For example, the computer program 52 may be split into the modules 41 to 43 shown in fig. 4.
The controller 5 may be a transmission controller on the vehicle, or a controller of a transmission cooling system, or a vehicle control unit on the vehicle, or the like. The controller 5 may include, but is not limited to, a processor 50, a memory 51. It will be appreciated by those skilled in the art that fig. 5 is merely an example of the controller 5 and is not meant to be limiting of the controller 5, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the controller may further include input-output devices, network access devices, buses, etc.
The processor 50 may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field-programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 51 may be an internal storage unit of the controller 5, such as a hard disk or a memory of the controller 5. The memory 51 may also be an external storage device of the controller 5, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the controller 5. Further, the memory 51 may also include both an internal storage unit and an external storage device of the controller 5. The memory 51 is used to store computer programs and other programs and data required by the controller. The memory 51 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
As another embodiment of the present invention, the present invention may further include a vehicle including the controller according to any one of the above embodiments, and the controller has the same advantages as those described above, and will not be described herein.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/controller and method may be implemented in other manners. For example, the apparatus/controller embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present invention may be implemented in whole or in part by a computer program to instruct related hardware, and the computer program may be stored in a computer readable storage medium, where the computer program, when executed by a processor, may implement the steps of the control method embodiments of the respective transmission cooling systems described above. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the content of the computer readable medium can be appropriately increased or decreased according to the requirements of the jurisdiction's jurisdiction and the patent practice, for example, in some jurisdictions, the computer readable medium does not include electrical carrier signals and telecommunication signals according to the jurisdiction and the patent practice.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (10)
1. A transmission cooling system, comprising: the low-temperature radiator, the cooling fan, the heat exchange pipeline, the electric drive water pump, the transmission motor and the transmission oil cooler;
the low-temperature radiator, the electric drive water pump, the transmission motor and the transmission oil cooler are sequentially connected in series through the heat exchange pipeline to form a cooling circulation loop of the transmission;
the cooling fan is used for cooling the cooling liquid in the heat exchange pipeline so as to cool the transmission motor and the oil liquid of the transmission through the cooling liquid.
2. A control method of a transmission cooling system, characterized in that the transmission cooling system is the transmission cooling system described in claim 1, the control method comprising:
Acquiring the transmission oil temperature, and acquiring the change trend of the transmission oil temperature according to the transmission oil temperature;
judging whether the change trend is a preset trend or not and whether the transmission oil temperature belongs to a preset temperature interval or not;
and if the change trend is the preset trend and the transmission oil temperature is in the preset temperature range, adjusting the duty ratio of the electric drive water pump to the preset water pump duty ratio, and adjusting the rotating speed duty ratio of the cooling fan to the preset rotating speed duty ratio.
3. The control method of a transmission cooling system according to claim 2, wherein the preset trend includes a temperature upward trend or a temperature downward trend;
judging whether the change trend is a preset trend or not and whether the transmission oil temperature belongs to a preset temperature interval or not comprises the following steps:
judging whether the change trend is the temperature upward trend or the temperature downward trend;
if the change trend is the temperature uplink trend, acquiring a first duty ratio adjustment table corresponding to the temperature uplink trend, and judging whether the transmission oil temperature belongs to any first preset temperature interval in the first duty ratio adjustment table; the first duty ratio adjustment table comprises a plurality of first preset temperature intervals, a first preset water pump duty ratio of the electric drive water pump corresponding to each first preset temperature interval and a first preset rotating speed duty ratio corresponding to the cooling fan;
If the change trend is the temperature downlink trend, acquiring a second duty ratio adjustment table corresponding to the temperature downlink trend, and judging whether the transmission oil temperature belongs to any second preset temperature interval in the second duty ratio adjustment table; the second duty ratio adjustment table comprises a plurality of second preset temperature intervals, second preset water pump duty ratios of the electric drive water pumps corresponding to the second preset temperature intervals and second preset rotating speed duty ratios of the cooling fans.
4. The control method of a transmission cooling system according to claim 3, wherein, if the trend of change is the preset trend and the transmission oil temperature is in the preset temperature interval, adjusting the duty ratio of the electric drive water pump to a preset water pump duty ratio and adjusting the rotational speed duty ratio of the cooling fan to a preset rotational speed duty ratio includes:
if the change trend is the temperature ascending trend and the transmission oil temperature belongs to any first preset temperature interval in the first duty cycle adjustment table, the duty cycle of the electric drive water pump is adjusted to a first preset water pump duty cycle corresponding to the first preset temperature interval, and the rotating speed duty cycle of the cooling fan is adjusted to a first preset rotating speed duty cycle corresponding to the first preset temperature interval;
And if the change trend is the downward trend of the temperature and the oil temperature of the transmission belongs to any second preset temperature interval in the second duty cycle adjustment table, adjusting the duty cycle of the electric drive water pump to a second preset water pump duty cycle corresponding to the second preset temperature interval, and adjusting the rotating speed duty cycle of the cooling fan to a second preset rotating speed duty cycle corresponding to the second preset temperature interval.
5. The control method of a transmission cooling system according to any one of claims 2 to 4, characterized by further comprising, after the transmission oil temperature is acquired, before the trend of change in the transmission oil temperature is obtained from the transmission oil temperature: detecting whether a transmission cooling function is activated;
obtaining a trend of change in transmission oil temperature from the transmission oil temperature, comprising:
and if the transmission cooling function is activated, obtaining the change trend of the transmission oil temperature according to the transmission oil temperature.
6. The method of claim 5, wherein detecting whether the transmission cooling function is activated comprises:
acquiring the working mode of a vehicle in which the transmission cooling system is positioned and high-voltage power-on and power-off information;
And if the working mode is a driving mode, the high-voltage power-on and power-off information represents that the high-voltage power-on is completed, and the transmission oil Wen Dayu is at a first preset oil temperature, determining that the transmission cooling function is activated.
7. The control method of a transmission cooling system according to claim 2, characterized by further comprising, after adjusting the duty ratio of the electric drive water pump to a preset water pump duty ratio and adjusting the rotational speed duty ratio of the cooling fan to a preset rotational speed duty ratio:
detecting whether a transmission cooling function is exited or not according to the working mode of a vehicle in which the transmission cooling system is located, high-voltage power-on and power-off information or the regulated transmission oil temperature;
and if the working mode is a charging mode, or the high-voltage power-on and power-off information represents that the high-voltage power-off is completed, or the regulated transmission oil temperature is smaller than a second preset oil temperature, judging that the transmission cooling function is exited.
8. A control device of a transmission cooling system, characterized by comprising:
the acquisition module is used for acquiring the oil temperature of the transmission and acquiring the change trend of the oil temperature of the transmission according to the oil temperature of the transmission;
the processing module is used for judging whether the change trend is a preset trend or not and whether the transmission oil temperature belongs to a preset temperature interval or not;
And the adjusting module is used for adjusting the duty ratio of the electric drive water pump to a preset water pump duty ratio and adjusting the rotating speed duty ratio of the cooling fan to a preset rotating speed duty ratio if the change trend is the preset trend and the oil temperature of the transmission belongs to the preset temperature interval.
9. A vehicle comprising a controller, the controller comprising a memory for storing a computer program and a processor for calling and running the computer program stored in the memory to perform the method of any one of claims 2 to 7.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any of the preceding claims 2 to 7.
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| CN202210751887.2A CN117345844A (en) | 2022-06-28 | 2022-06-28 | Transmission cooling system, control method of transmission cooling system, and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117869503A (en) * | 2024-03-11 | 2024-04-12 | 比亚迪股份有限公司 | Temperature control method and system of electromagnetic shock absorber, controller and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117869503A (en) * | 2024-03-11 | 2024-04-12 | 比亚迪股份有限公司 | Temperature control method and system of electromagnetic shock absorber, controller and vehicle |
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