WO2020203455A1 - Dispositif de commande - Google Patents

Dispositif de commande Download PDF

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Publication number
WO2020203455A1
WO2020203455A1 PCT/JP2020/012962 JP2020012962W WO2020203455A1 WO 2020203455 A1 WO2020203455 A1 WO 2020203455A1 JP 2020012962 W JP2020012962 W JP 2020012962W WO 2020203455 A1 WO2020203455 A1 WO 2020203455A1
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Prior art keywords
current
vehicle
soc
δsoc
voltage
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PCT/JP2020/012962
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English (en)
Japanese (ja)
Inventor
大祐 倉知
大和 宇都宮
佐藤　嘉洋
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株式会社デンソー
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Priority to DE112020001789.3T priority Critical patent/DE112020001789T5/de
Publication of WO2020203455A1 publication Critical patent/WO2020203455A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/13—Maintaining the SoC within a determined range
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/14—Preventing excessive discharging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/15—Preventing overcharging
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H02J7/00716—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current in response to integrated charge or discharge current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/547—Voltage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/549—Current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2260/00—Operating Modes
    • B60L2260/40—Control modes
    • B60L2260/42—Control modes by adaptive correction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

Definitions

  • the present disclosure relates to a control device that controls a power storage device.
  • control device that calculates a power storage state (SOC) during charging / discharging of the power storage device and controls the power storage device based on the calculated SOC (for example, Patent Document 1). According to this control device, it is possible to prevent the power storage device from being overcharged or overdischarged and to protect the power storage device.
  • SOC power storage state
  • the SOC calculated during charging / discharging is calculated using, for example, the time integral value of the current acquired during charging / discharging of the power storage device, this SOC corresponds to the integration of the current detection error. Accumulation error is included.
  • the power storage device is controlled by using the SOC including this storage error, the storage capacity corresponding to the storage error in the power storage device cannot be used up.
  • the SOC accumulation error generated during charging / discharging can be reset by using the voltage between terminals of the power storage device acquired while the charging / discharging of the power storage device is stopped.
  • the voltage between terminals during charging / discharging stop cannot be obtained, so the storage error cannot be reset for a long period of time, and the storage capacity that cannot be used up increases due to the increase in storage error.
  • a technique capable of resetting the SOC accumulation error even during charging / discharging of the power storage device is desired.
  • the present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a control device capable of resetting an SOC accumulation error even during charging / discharging of a power storage device.
  • the first means for solving the above-mentioned problems is a control device that controls charging / discharging of the power storage device, that is, a current acquisition unit that acquires the current during charging / discharging of the power storage device at a predetermined cycle, and the power storage device.
  • a state calculation unit that calculates the SOC indicating the storage state during charging / discharging, a voltage acquisition unit that acquires the voltage between terminals during charging / discharging of the power storage device, and a current acquired by the current acquisition unit is a predetermined current.
  • the SOC is updated based on the current determination unit that determines whether the state is smaller than the threshold and the terminal-to-terminal voltage acquired by the voltage acquisition unit when it is determined that the state is smaller than the current threshold. By doing so, an error reset unit for resetting the accumulated error of the SOC is provided.
  • the SOC is calculated based on the time integral value of the current acquired during charging / discharging, so that the SOC accumulation error increases by integrating the current detection error.
  • the SOC is updated based on the voltage between the terminals during charging / discharging, thereby accumulating error. To reset.
  • the SOC is updated by calculating the SOC based on the above, and the SOC accumulation error is reset by updating the SOC. As a result, the accumulation error can be reset even during charging / discharging of the power storage device.
  • the current determination unit is smaller than the current threshold value when the state in which the current acquired by the current acquisition unit is smaller than the current threshold value continues for a predetermined determination period. Determined to be in a state.
  • the current determination unit is in a state in which the fluctuation amount of the voltage between the terminals is smaller than the current threshold value when the state in which the fluctuation amount is smaller than the predetermined fluctuation threshold value continues for a predetermined determination period. Is determined to be.
  • the amount of fluctuation in the voltage between terminals during charging and discharging of the power storage device is proportional to the current during charging and discharging. Therefore, it can be determined whether the current during charging / discharging is smaller than the current threshold value based on the voltage between terminals.
  • the power storage device is mounted on a vehicle, and the vehicle includes a rotary electric machine as a traveling drive source of the vehicle driven by power supply from the power storage device, and the current determination unit. Determines that the vehicle is smaller than the current threshold when the vehicle is stopped.
  • the current determination unit determines that the vehicle is restarting when the vehicle is stopped
  • the error reset unit determines that the vehicle is restarting when the vehicle is stopped.
  • the SOC accumulation error is reset.
  • the SOC accumulation error increases due to the increase in the current detection error. Therefore, when resetting the accumulation error, it is preferable to reset the accumulation error before the running of the vehicle is restarted.
  • a current detection error occurs because the current is not zero even when the vehicle is stopped, and the accumulation error increases by integrating the detection error. Therefore, when resetting the accumulation error while the vehicle is stopped, it is preferable to reset the accumulation error immediately before the vehicle is resumed, for example, to reset the accumulated error increased while the vehicle is stopped.
  • the vehicle is supplied with power from the power storage device to the rotary electric machine in response to the accelerator operation by the driver, and the current determination unit determines that the accelerator operation amount by the driver of the vehicle is the first accelerator threshold value.
  • the first accelerator threshold is set to a value smaller than the second accelerator threshold.
  • the first accelerator threshold value and the second accelerator threshold value are defined in determining the restart of traveling of the vehicle based on the accelerator operation amount, and the second accelerator threshold value is determined by the power supply from the power storage device. This is the threshold value at which the vehicle is driven. Further, the first accelerator threshold value is a threshold value for determining the resumption of traveling of the vehicle, and is set to a value smaller than the second accelerator threshold value. Therefore, it is possible to determine whether the vehicle is resuming driving before the vehicle actually resumes traveling by operating the accelerator by the driver.
  • FIG. 1 is a schematic view of the vehicle system.
  • FIG. 2 is a flowchart showing a processing procedure of the control processing of the first embodiment.
  • FIG. 3 is a flowchart showing the processing procedure of the ⁇ SOC calculation process.
  • FIG. 4 is a flowchart showing the processing procedure of the ⁇ SOC reset process.
  • FIG. 5 is a diagram showing the relationship between the input / output current and the amount of error.
  • FIG. 6 is a diagram showing the relationship between the input / output current and the reference error.
  • FIG. 7 is a diagram showing the relationship between the open circuit voltage and the correction coefficient.
  • FIG. 8 is a time chart showing the transition of ⁇ SOC during discharging of the high voltage battery.
  • FIG. 9 is a diagram showing the relationship between ⁇ SOC and the power margin.
  • FIG. 10 is a time chart showing changes in the input / output current and the closed circuit voltage CCV during the reset period.
  • FIG. 11 is a time chart showing the transition of the maximum power during discharging of the high voltage battery.
  • FIG. 12 is a diagram showing correspondence information between SOC and maximum power.
  • FIG. 13 is a diagram showing the relationship between the input / output current and the upper limit voltage and the lower limit voltage.
  • FIG. 14 is a flowchart showing a processing procedure of the control processing of the second embodiment.
  • the vehicle includes a high-voltage battery 11, an inverter 12 that converts DC power of the high-voltage battery 11 into AC power, and a motor 13 as a traveling drive source driven by AC power output from the inverter 12. It has.
  • electric power is supplied from the high-voltage battery 11 to the motor 13 via the inverter 12 in response to the accelerator operation by the driver, and the running power is given to the vehicle by the power running drive of the motor 13 accompanying the electric power supply.
  • the motor 13 is a rotary electric machine (motor generator) having a power generation function in addition to a power running function.
  • the generated power generated by the regenerative power generation is supplied to the high voltage battery 11 via the inverter 12.
  • the motor 13 functions as a generator, and the high-voltage battery 11 is charged by the generated power.
  • the high-voltage battery 11 corresponds to a "power storage device".
  • the electric power of the high voltage battery 11 is supplied to the high voltage auxiliary machine 14 in addition to the motor 13.
  • the high-voltage auxiliary machine 14 is, for example, an electric compressor of an air conditioner for air-conditioning the interior of a vehicle, and is driven by power supplied from the high-voltage battery 11.
  • the high voltage battery 11 is provided with a temperature sensor 15 that detects the battery temperature TM.
  • the high voltage battery 11 is, for example, a lithium ion storage battery, and the voltage between terminals thereof is, for example, about 200 to 300 V.
  • the low-voltage battery 17 and the low-voltage auxiliary machine 18 are connected to the high-voltage battery 11 via a DCDC converter 16 as a power converter.
  • the DCDC converter 16 performs power conversion in both directions between the high voltage system and the low voltage system.
  • the low voltage battery 17 is, for example, a lead storage battery rated at 12 V.
  • the low-voltage auxiliary machine 18 is, for example, an electric power station, a battery fan, or the like, and in addition to being able to be driven by the electric power from the high-voltage battery 11 supplied via the DCDC converter 16, the electric power is supplied from the low-voltage battery 17. Can be driven by.
  • the DCDC converter 16 steps down the high voltage of the high-voltage battery 11 to the voltage level of the low-voltage battery 17 or the power supply voltage level of the low-voltage auxiliary machine 18, so as to the low-voltage battery 17 and the low-voltage auxiliary machine 18. Supply power.
  • this system is equipped with an ECU 20 mainly composed of a microcomputer having a CPU and various memories.
  • the ECU 20 includes a voltage sensor 21 that detects the voltage between terminals of the high voltage battery 11, a current sensor 22 that detects the input / output current IB of the high voltage battery 11, and an accelerator operation amount AC of the driver.
  • the accelerator sensor 23 for detecting the vehicle speed MV, the vehicle speed sensor 24 for detecting the vehicle speed MV, and the like are connected.
  • an IG switch 25 which is a vehicle start switch, is connected to the ECU 20, and the on / off state of the IG switch 25 is monitored.
  • the ECU 20 controls charging / discharging of the high-voltage battery 11 based on the voltage between terminals of the high-voltage battery 11 and the input / output current IB and the like.
  • the ECU 20 corresponds to a “control device”.
  • the ECU 20 calculates an SOC (State Of Charge) indicating the state of charge of the high-voltage battery 11 during charging / discharging of the high-voltage battery 11, and the calculated SOC enables input / output from the high-voltage battery 11.
  • Maximum power WB is set. Further, when the calculated SOC reaches the upper limit threshold value ST1 or the lower limit threshold value ST2 (see FIG. 12), the charging / discharging of the high voltage battery 11 is stopped. By controlling the charging and discharging of the high-voltage battery 11 based on the SOC, it is possible to prevent the high-voltage battery 11 from being in an overcharged state or an overdischarged state.
  • this SOC includes the input / output current IB in the current sensor 22.
  • Detection error ⁇ SOC which is an accumulation error according to the integration of GI, is included. Therefore, if the charging / discharging of the high-voltage battery 11 is stopped when the SOC reaches the upper limit threshold value ST1 or the lower limit threshold value ST2, the storage capacity for this ⁇ SOC cannot be used up.
  • the usage is to increase the storage capacity of the high-voltage battery 11 up to the upper limit threshold value ST1 at the time of charging, and to decrease the storage capacity of the high-voltage battery 11 up to the lower limit threshold value ST2 at the time of discharge.
  • the ⁇ SOC generated during charging / discharging can be reset by using the inter-terminal voltage of the high-voltage battery 11 acquired while the high-voltage battery 11 is stopped charging / discharging.
  • the voltage between the terminals of the high-voltage battery 11 cannot be acquired during charging / discharging stop, so that ⁇ SOC cannot be reset for a long period of time and may be used up due to an increase in ⁇ SOC.
  • the storage capacity that cannot be stored increases.
  • a technique capable of resetting ⁇ SOC even during charging / discharging of the high-voltage battery 11 is desired.
  • ⁇ SOC in order to reset ⁇ SOC during charging / discharging of the high-voltage battery 11, when the input / output current IB is smaller than the current threshold IT during charging / discharging of the high-voltage battery 11, charging / discharging is in progress.
  • the ⁇ SOC is reset based on the voltage between the terminals of the high voltage battery 11 in. That is, if the input / output current IB is smaller than the current threshold value, it is determined that the terminal voltage of the high voltage battery 11 during charging / discharging is equivalent to the terminal voltage of the high voltage battery 11 during charging / discharging stop. Then, ⁇ SOC is reset based on the voltage between the terminals of the high voltage battery 11 during charging / discharging. As a result, ⁇ SOC can be reset even during charging / discharging of the high-voltage battery 11.
  • FIG. 2 is a flowchart showing a processing procedure of a control process for controlling charging / discharging of the high-voltage battery 11, and this process is repeatedly executed by the ECU 20 at a predetermined cycle when the IG switch 25 is turned on. To.
  • step S10 it is determined whether the high voltage battery 11 is being charged or discharged. Immediately after the IG switch 25 is switched to the ON state, since the high-voltage battery 11 has not yet started charging / discharging, a negative determination is made in step S10.
  • the voltage sensor 21 is used to acquire the open circuit voltage OCV, which is the voltage between the terminals of the high voltage battery 11 while the high voltage battery 11 is being charged / discharged.
  • step S14 the SOC is calculated based on the open circuit voltage OCV, and the control process is terminated. Correspondence information in which the open circuit voltage OCV and SOC are associated in advance is stored in the ECU 20, and the SOC is calculated based on the open circuit voltage OCV acquired in step S12 using this correspondence information.
  • step S10 the voltage sensor 21 is used to acquire the closed circuit voltage CCV, which is the voltage between the terminals of the high voltage battery 11 during charging / discharging of the high voltage battery 11.
  • step S18 the input / output current IB is acquired by using the current sensor 22, and the battery temperature TM is acquired by using the temperature sensor 15.
  • step S16 corresponds to the "voltage acquisition unit”
  • step S18 corresponds to the "current acquisition unit”.
  • step S20 the SOC is calculated based on the time integral value of the input / output current IB.
  • the SOC corresponding to the time integral value of the input / output current IB acquired in a predetermined cycle is compared with the initial value of SOC calculated based on the open circuit voltage OCV.
  • the SOC is calculated by adding the increase / decrease of. Assuming that the initial value of SOC calculated based on the open circuit voltage OCV is SOC (ini) and the full charge capacity of the high voltage battery 11 is CB, the SOC calculated based on the time integrated value of the input / output current IB is ( It is expressed as in equation 1).
  • the process of step S20 corresponds to the "state calculation unit".
  • FIG. 3 shows a flowchart of the ⁇ SOC calculation process.
  • the ⁇ SOC of the SOC is calculated so as to increase with the elapsed time TP (see FIG. 8) during charging / discharging of the high-voltage battery 11.
  • step S70 the initial value ⁇ SOC (ini) of ⁇ SOC is calculated.
  • the initial value ⁇ SOC (ini) is, for example, an error amount GS at the reset timing when ⁇ SOC is reset.
  • the initial value ⁇ SOC (ini) corresponds to the “initial SOC error”.
  • the SOC error amount GS is calculated according to the input / output current IB and the battery temperature TM acquired in step S18.
  • FIG. 5 is a diagram showing the relationship between the input / output current IB and the error amount GS. As shown in FIG. 5, the smaller the input / output current IB, the larger the error amount GS is calculated.
  • the error amount GS is expressed as shown in (Equation 2), where J is the negative proportional coefficient and SGZ is the error amount when the input / output current IB is zero.
  • the time increase rate ⁇ (see FIG. 8) in which ⁇ SOC increases with the elapsed time TP is determined based on the calculated error amount GS.
  • the time increase rate ⁇ is expressed as shown in (Equation 3), where TS is a predetermined cycle that is the acquisition cycle of the input / output current IB.
  • ⁇ GS / TS ... (Equation 3)
  • the error amount GS from the initial stage is integrated.
  • the integrated value of the error amount GS calculated in step S72 and the initial error amount GSF calculated in step S70 are added to calculate ⁇ SOC, and the ⁇ SOC calculation process is completed.
  • ⁇ SOC is expressed as (Equation 4).
  • ⁇ SOC ⁇ SOC (ini) + ⁇ GS ⁇ dt ...
  • Equation 4 ⁇ GS ⁇ dt in (Equation 4) is a time integral value of the error amount GS, and can be expressed as ⁇ (J ⁇ IB + SGZ) ⁇ dt using (Equation 2).
  • IB ⁇ dt indicates the time integral value of the input / output current IB, that is, the fluctuation amount of SOC in a predetermined period TS.
  • step S24 When the ⁇ SOC calculation process is completed, the process returns to FIG. 2 and the ⁇ SOC reset process is performed in step S24.
  • FIG. 4 shows a flowchart of the ⁇ SOC reset process.
  • ⁇ SOC reset process when a predetermined reset condition is satisfied, ⁇ SOC is reset during charging / discharging of the high-voltage battery 11.
  • step S80 it is determined whether the ⁇ SOC calculated in step S72 is larger than the predetermined error threshold value ⁇ ST (see FIG. 8).
  • the error threshold value ⁇ ST is an accumulation error that hinders the use-up of the high-voltage battery 11, and is preset for each battery temperature TM. If a negative determination is made in step S80, the ⁇ SOC reset process is terminated without resetting the ⁇ SOC.
  • step S80 determines whether ⁇ SOC is larger than the error threshold value ⁇ ST.
  • step S82 determines whether ⁇ SOC is larger than the predetermined reference error ⁇ SK (see FIG. 8).
  • the reference error ⁇ SK is a reset error that occurs when ⁇ SOC is reset during charging / discharging of the high voltage battery 11, and is preset to a value larger than zero.
  • the reference error ⁇ SK is set based on the input / output current IB and the battery temperature TM acquired in step S18.
  • FIG. 6 is a diagram showing the relationship between the input / output current IB and the reference error ⁇ SK.
  • the smaller the input / output current IB the larger the reference error ⁇ SK is set.
  • the reference error ⁇ SK also fluctuates depending on the battery temperature TM.
  • Correspondence information in which the input / output current IB, the battery temperature TM, and the reference error ⁇ SK are associated in advance is stored in the ECU 20, and the reference error ⁇ SK is set using this correspondence information.
  • step S82 If a negative determination is made in step S82, the ⁇ SOC increases due to the reset, so the ⁇ SOC reset process ends without resetting the ⁇ SOC.
  • step S84 it is determined in step S84 whether the vehicle is stopped.
  • the vehicle speed MV is substantially zero, that is, the vehicle speed MV is smaller than the predetermined speed near zero.
  • the input / output current IB is equal to or greater than the predetermined current threshold IT. Is also small. For example, when the input / output current IB acquired in step S18 is smaller than the predetermined current threshold IT for the determination period YA, it is determined that the vehicle is stopped (see FIG. 10). ).
  • the current threshold IT is a current at which the motor 13 can be driven only by supplying electric power from the high voltage battery 11.
  • the fluctuation threshold value ⁇ VT is the minimum fluctuation amount of the closed circuit voltage CCV generated by driving the motor 13.
  • step S84 If a negative determination is made in step S84, the ⁇ SOC reset process ends without resetting the ⁇ SOC.
  • step S84 determines whether ⁇ SOC has been reset during the stopped operation. If an affirmative determination is made in step S86, it is determined in step S88 whether the determination period YA has elapsed since the previous ⁇ SOC was reset. If a negative determination is made in step S88, it is determined in step S90 that the vehicle is restarting.
  • the resumption of running of the vehicle means that the vehicle speed MV becomes larger than the predetermined speed near zero after it is determined that the running of the vehicle is stopped. Specifically, the input / output current IB is higher than the current threshold IT. Is also to grow.
  • steps S84 and S90 correspond to the "current determination unit".
  • the first accelerator threshold value AT1 and the second accelerator threshold value AT2 are defined in determining the restart of traveling of the vehicle based on the accelerator operation amount AC, of which the second accelerator threshold value AT2 is the high voltage battery 11. It is the amount of accelerator operation that produces the minimum electric power that the vehicle can travel by supplying electric power from.
  • the first accelerator threshold AT1 is set to an accelerator operation amount smaller than the second accelerator threshold AT2, and by using the first accelerator threshold AT1, it is determined that the vehicle is restarted before the vehicle actually resumes running. it can.
  • step S90 If a negative determination is made in step S90, the ⁇ SOC is not so large, so the ⁇ SOC reset process is terminated without resetting the ⁇ SOC.
  • step S86 determines whether a negative determination is made in step S86, an affirmative determination is made in step S88, or an affirmative determination is made in step S90.
  • ⁇ SOC is reset based on the closed circuit voltage CCV acquired in step S16.
  • step S92 the SOC is calculated based on the closed circuit voltage CCV acquired in step S16, and the SOC is updated.
  • step S94 ⁇ SOC is reset to the reference error ⁇ SK. That is, ⁇ SOC is reset by updating the SOC in step S92. Therefore, after resetting ⁇ SOC, ⁇ SOC is calculated so as to increase from the reference error ⁇ SK with the elapsed time TP.
  • step S96 the elapsed time TP is reset to zero, and the ⁇ SOC reset process is completed.
  • the process of step S94 corresponds to the “error reset unit”.
  • step S26 it is determined whether the high voltage battery 11 is being charged.
  • the current sensor 22 detects the input / output current IB flowing toward the high-voltage battery 11 as a positive value and the input / output current IB flowing out of the high-voltage battery 11 as a negative value, and the input / input acquired in step S18. Whether the high-voltage battery 11 is being charged can be determined based on whether the output current IB is larger than zero.
  • step S28 the SOC calculated in step S20 or step S92 and the ⁇ SOC calculated in step S72 are added and calculated as the SOC.
  • the SOC calculated in step S28 is the largest SOC in the SOC error range set based on ⁇ SOC, that is, the SOC error range having twice the width of ⁇ SOC centered on the SOC.
  • step S30 it is determined whether the SOC calculated in step S28 is smaller than the upper limit threshold value ST1.
  • step S32 the maximum power WB is set based on the SOC calculated in step S28. That is, the maximum power WB is set based on the added value of the SOC calculated in step S20 or S92 and the ⁇ SOC calculated in step S72.
  • Correspondence information (see FIG. 12) in which the SOC and the maximum power WB are associated in advance is stored in the ECU 20, and the maximum power WB is calculated based on the SOC calculated in step S28 using this correspondence information.
  • Correspondence information is set for the SOC in the range from the upper limit threshold value ST1 to the lower limit threshold value ST2, and is specified for each battery temperature TM.
  • step S34 the charge / discharge of the high voltage battery 11 is controlled by using the maximum power WB set in step S32, and the control process is terminated.
  • step S30 determines whether the SOC reaches the upper limit threshold value ST1 or not.
  • the maximum power WB is set to the reference input power WK1 (see FIG. 12A) in step S36.
  • step S38 charging of the high voltage battery 11 is continued using the reference input power WK1 set in step S36.
  • the charge control in step S38 is performed in a high storage state in which the SOC is larger than the upper limit threshold value ST1.
  • the charge stop is controlled by using the closed circuit voltage CCV.
  • the high voltage side limiting range XH (see FIG. 7A) for stopping the charging of the high voltage battery 11 is predetermined.
  • the closed circuit voltage CCV belongs to the high voltage side limiting range XH, that is, when the closed circuit voltage CCV reaches the upper limit voltage VT1 which is the lower limit of the high voltage side limiting range XH, the high voltage battery 11 is overcharged. In order to suppress this, charging of the high voltage battery 11 is stopped.
  • the closed circuit voltage CCV fluctuates depending on the input / output current IB, if the high voltage side limiting range XH is constant regardless of the input / output current IB, the high voltage battery 11 becomes overcharged depending on the input / output current IB. I can't control that.
  • the closed circuit voltage CCV is expressed as shown in (Equation 5), where RB is the internal resistance of the high voltage battery 11.
  • step S40 the high voltage side limiting range XH is variably set based on the input / output current IB acquired in step S18. Specifically, the closed circuit voltage CCV and the high-voltage side limiting range XH are set to fluctuate in conjunction with each other based on the input / output current IB. As a result, it is possible to prevent the high voltage battery 11 from being overcharged regardless of the input / output current IB and the battery temperature TM.
  • step S42 it is determined whether the closed circuit voltage CCV is larger than the upper limit voltage VT1. If a negative determination is made in step S42, the control process ends. On the other hand, if an affirmative determination is made in step S42, the reference input power WK1 set in step S36 is limited in step S44, and the control process ends.
  • step S44 for example, as shown in FIG. 7A, a correction coefficient that becomes smaller as the closed circuit voltage CCV becomes larger than the upper limit voltage VT1 is set in advance, and this correction coefficient is integrated into the reference input power WK1.
  • the reference input power WK1 is limited. Therefore, the reference input power WK1 gradually decreases as the closed circuit voltage CCV rises, and charging is stopped when the reference input power WK1 becomes zero.
  • step S46 the SOC calculated in step S20 or S92 minus the ⁇ SOC calculated in step S72 is calculated as the SOC.
  • the SOC calculated in step S46 is the smallest SOC in the SOC error range set based on ⁇ SOC.
  • step S48 it is determined whether the SOC calculated in step S46 is larger than the lower limit threshold value ST2.
  • step S48 If an affirmative judgment is made in step S48, that is, if the SOC has not reached the lower limit threshold value ST2, the process proceeds to step S32.
  • step S32 the maximum power WB is set based on the SOC calculated in step S46.
  • step S50 if a negative determination is made in step S48, that is, when the SOC reaches the lower limit threshold value ST2, the maximum power WB is set to a constant reference output power WK2 (see FIG. 12B) in step S50.
  • the high voltage battery 11 is continuously discharged using the reference output power WK2 set in step S50.
  • the discharge control in step S50 is performed in a low storage state where the SOC is smaller than the lower limit threshold value ST2.
  • the discharge stop is controlled by using the closed circuit voltage CCV.
  • the low voltage side limit range XL (see FIG. 7B) for stopping the discharge of the high voltage battery 11 is predetermined.
  • the closed circuit voltage CCV belongs to the low voltage side limit range XL, that is, when the closed circuit voltage CCV reaches the lower limit voltage VT2 which is the upper limit of the low voltage side limit range XL, the high voltage battery 11 is in an overdischarged state. The discharge of the high voltage battery 11 is stopped in order to suppress this.
  • the low voltage side limit range XL is variably set based on the input / output current IB acquired in step S18. Specifically, the closed circuit voltage CCV and the low voltage side limiting range XL are set to fluctuate in conjunction with each other based on the input / output current IB. As a result, it is possible to prevent the high voltage battery 11 from being over-discharged regardless of the input / output current IB and the battery temperature TM.
  • step S56 it is determined whether the closed circuit voltage CCV is smaller than the lower limit voltage VT2. If a negative determination is made in step S56, the control process ends. On the other hand, if an affirmative determination is made in step S56, the reference output power WK2 set in step S50 is limited in step S58, and the control process ends.
  • step S58 for example, as shown in FIG. 7B, a correction coefficient that becomes smaller as the closed circuit voltage CCV becomes smaller than the lower limit voltage VT2 is set in advance, and this correction coefficient is integrated into the reference input power WK1. Limit the reference output power WK2. Therefore, the reference output power WK2 gradually decreases as the closed circuit voltage CCV decreases, and the discharge is stopped when the reference output power WK2 becomes zero.
  • FIG. 8 shows an example of ⁇ SOC calculation processing.
  • FIG. 8 shows the transition of ⁇ SOC during discharging of the high voltage battery 11.
  • (A) shows the transition of SOC
  • (B) shows the transition of ⁇ SOC
  • (C) shows the transition of the reset flag FR.
  • the reset flag FR is a flag indicating the determination result in step S80 of the ⁇ SOC calculation process, and is turned on when a positive determination is made in step S80 and turned off when a negative determination is made in step S80.
  • the IG switch 25 is switched to the ON state at time t1, the motor 13 is driven by the power supply from the high voltage battery 11, and the vehicle starts running.
  • SOC is calculated based on the open circuit voltage OCV, and ⁇ SOC is reset to zero.
  • the SOC decreases due to the power supply from the high voltage battery 11 to the motor 13. While the high voltage battery 11 is being discharged, the SOC is calculated based on the time integral value of the input / output current IB.
  • the detection error GI of the current sensor 22 that detects the input / output current IB is integrated, so that the integration of the detection error GI causes ⁇ SOC.
  • ⁇ SOC is calculated so as to increase with the elapsed time TP from the time t1. Specifically, it is calculated so as to increase by the time increase rate ⁇ with respect to the elapsed time TP from the time t1.
  • This time increase rate ⁇ is a positive value and fluctuates depending on the input / output current IB and the battery temperature TM (see time t7 and time t8). Since ⁇ SOC increases with the elapsed time TP, ⁇ SOC at time t2 is smaller than ⁇ SOC at time t3, which is later than time t2.
  • FIG. 9 is a diagram showing the relationship between ⁇ SOC and the power margin ⁇ WB of the maximum power WB.
  • the power margin ⁇ WB is a setting error of the maximum power WB, and is generated by setting the maximum power WB based on the SOC including ⁇ SOC.
  • the power margin ⁇ WB increases as ⁇ SOC increases, and when the power margin ⁇ WB increases, the maximum power WB cannot be set appropriately, and it is high depending on the set maximum power WB. It is not possible to use up the storage capacity of the voltage battery 11 for ⁇ SOC, and it is not possible to prevent the high voltage battery 11 from being over-discharged.
  • ⁇ SOC increases with the elapsed time TP, there is a timing when ⁇ SOC is small, for example, at time t2.
  • the power margin ⁇ WB is set small. Therefore, by using the timing at which the ⁇ SOC is small, it is possible to achieve both the use-up of the high-voltage battery 11 and the suppression of the over-discharged state.
  • the ⁇ SOC When the ⁇ SOC is reset while the high-voltage battery 11 is discharging, the ⁇ SOC is reset to the reference error ⁇ SK.
  • the reference error ⁇ SK is set based on the input / output current IB and the battery temperature TM. Therefore, depending on the input / output current IB and the battery temperature TM, the reference error ⁇ SK can be set small, which is advantageous in using up the high voltage battery 11.
  • a reference error ⁇ SK is set at time t5 based on the input / output current IB at this time t5, and ⁇ SOC is reset to this reference error ⁇ SK.
  • the reset flag FR is switched off at time t5, and the elapsed time TP is reset to zero. Then, when the vehicle resumes running at time t6, the time counting of the elapsed time TP is restarted. Therefore, it can be said that the elapsed time TP indicates the elapsed time from the reset timing at which ⁇ SOC was reset immediately before.
  • FIG. 10 shows an example of the ⁇ SOC reset process.
  • FIG. 10 shows the transition of the input / output current IB and the closed circuit voltage CCV in the reset period YR, and specifically shows the transition of these values in the reset period YR from the time t5 to the time t6 in FIG.
  • (A) shows the transition of the vehicle speed MV
  • (B) shows the transition of the accelerator operation amount AC
  • (C) shows the transition of the input / output current IB
  • (D) shows the transition of the closed circuit.
  • the transition of the voltage CCV is shown
  • (E) shows the transition of the fluctuation amount ⁇ V of the closed circuit voltage CCV.
  • the fluctuation amount ⁇ V of the input / output current IB and the closed circuit voltage CCV due to the increase of the closed circuit voltage CCV decreases with the passage of time from the time t5, and the input / output current IB decreases below the current threshold IT at the time t21.
  • the fluctuation amount ⁇ V is lower than the fluctuation threshold ⁇ VT at time t22, which is later than time t21.
  • the input / output current IB continues to be lower than the current threshold IT and the fluctuation amount ⁇ V is lower than the fluctuation threshold ⁇ VT from the later time t22 to the determination period YA. If the low state continues, it is determined that the vehicle is stopped at the time t23 when the determination period YA elapses from the time t22.
  • ⁇ SOC is first reset at this time t23. Specifically, the SOC is calculated and updated based on the closed circuit voltage CCV that has risen until it approaches the open circuit voltage OCV, and the ⁇ SOC is reset to the reference error ⁇ SK accordingly. By resetting ⁇ SOC based on the closed circuit voltage CCV while the vehicle is stopped, the ⁇ SOC can be reset even during charging / discharging of the high-voltage battery 11.
  • the ⁇ SOC is reset for each determination period YA. For example, the ⁇ SOC is reset at the time t24 when the determination period YA elapses from the time t23.
  • the driver's accelerator operation is started at time t25 and the accelerator operation amount AC exceeds the first accelerator threshold value AT1 at time t26 thereafter, it is determined that the vehicle is restarted.
  • the accelerator operation amount AC exceeds the second accelerator threshold value AT2 at the subsequent time t6, the running of the vehicle is restarted by the power supply from the high voltage battery 11.
  • the vehicle speed MV increases, the input / output current IB increases, and the closed circuit voltage CCV decreases apart from the open circuit voltage OCV.
  • FIG. 11 shows an example of control processing.
  • FIG. 11 shows the transition of the maximum power WB during discharging of the high voltage battery 11.
  • (A) shows the transition of SOC
  • (B) shows the transition of the maximum power WB
  • (C) shows the transition of the closed circuit voltage CCV.
  • ⁇ SOC does not become larger than the error threshold value ⁇ ST, it is assumed that the ⁇ SOC reset process is not performed.
  • the SOC decreases due to the power supply from the high-voltage battery 11 to the motor 13. Along with this decrease in SOC, the closed circuit voltage CCV decreases and the set value of the maximum power WB fluctuates.
  • the maximum power WB is set based on the SOC. As a result, deterioration of the high-voltage battery 11 due to excess power of the high-voltage battery 11 can be suppressed, and the high-voltage battery 11 can be protected.
  • the maximum power WB is set by using the correspondence information between the SOC and the maximum power WB.
  • This correspondence information is preset in consideration of the power excess of the high voltage battery 11.
  • FIG. 12 is a diagram showing correspondence information between SOC and maximum power WB.
  • (A) shows correspondence information at the time of charging
  • (B) shows correspondence information at the time of discharging.
  • the correspondence information at the time of discharge is set so that the larger the SOC, the larger the maximum power WB, and the higher the battery temperature TM, the larger the maximum power WB. Set.
  • the SOC including ⁇ SOC specifically, the SOC obtained by subtracting ⁇ SOC from the SOC in order to suppress the deterioration of the high-voltage battery 11 due to the power excess of the high-voltage battery 11 (SOC- ⁇ SOC). Is calculated as SOC, and the maximum power WB is set based on this SOC.
  • SOC- ⁇ SOC the SOC obtained by subtracting ⁇ SOC from SOC
  • SOL the value obtained by subtracting ⁇ SOC from SOC
  • the SOL reaches the lower limit threshold value ST2 before the SOC due to the power supply from the high voltage battery 11 to the motor 13.
  • the SOL reaches the lower limit threshold value ST2 it is conceivable to stop the discharge of the high voltage battery 11 in order to prevent the high voltage battery 11 from being over-discharged.
  • the SOC is a value obtained by adding ⁇ SOC to the lower limit threshold value ST2.
  • the correspondence information corresponding to the SOL is shifted by ⁇ SOC to the side where the SOL increases with respect to the correspondence information corresponding to the SOC shown by the solid line. are doing. Therefore, if the discharge of the high-voltage battery 11 is stopped when the SOL reaches the lower limit threshold value ST2, the storage capacity of the high-voltage battery 11 for ⁇ SOC cannot be used up.
  • the maximum power WB is set to the reference output power WK2, and the SOC is high until the lower limit threshold value ST2 is reached.
  • the reference output power WK2 is the maximum power WB associated with the lower limit threshold value ST2 in the corresponding information, and is a constant value regardless of the SOC.
  • the reference output power WK2 is set to a power that allows the vehicle to travel by the motor 13.
  • the maximum power WB is set to the reference output power WK2, and the discharge of the high voltage battery 11 is continued. Due to this discharge, the SOC and the closed circuit voltage CCV decrease. This discharge is performed until the closed circuit voltage CCV reaches the lower limit voltage VT2, and when the closed circuit voltage CCV reaches the lower limit voltage VT2 at time t33, that is, when the closed circuit voltage CCV belongs to the low voltage side limit range XL, FIG.
  • the reference output power WK2 is limited by the correction coefficient shown in (B). As a result, at the time t34 when the SOC reaches the lower limit threshold value ST2, the maximum power WB becomes zero and the closed circuit voltage CCV becomes the lower limit voltage VL, so that the discharge is stopped.
  • the lower limit voltage VT2 is set according to the input / output current IB and the battery temperature TM.
  • FIG. 13 is a diagram showing the relationship between the input / output current IB and the upper limit voltage VT1 and the lower limit voltage VT2.
  • (A) shows the relationship between the input / output current IB at the time of charging and the upper limit voltage VT1
  • (B) shows the relationship between the input / output current IB at the time of discharging and the lower limit voltage VT2.
  • the lower limit voltage VT2 is set to the low voltage side as the input / output current IB is larger during discharge, and the lower limit voltage VT2 is set to the lower voltage side as the battery temperature TM is higher. Is set.
  • FIG. 13B also shows the relationship between the input / output current IB at the time of discharge and the closed circuit voltage CCV.
  • the closed circuit voltage CCV fluctuates to the low pressure side as the input / output current IB increases.
  • the lower limit voltage VT2 is changed in conjunction with the input / output current IB characteristic of the closed circuit voltage CCV. As a result, it is possible to determine whether the closed circuit voltage CCV has reached the lower limit voltage VT2 under a certain condition that does not depend on the input / output current IB, and it is possible to suppress the high voltage battery 11 from being over-discharged.
  • the transition of the maximum power WB during the discharge of the high voltage battery 11 is shown, but the same applies to the transition of the maximum power WB during the charging of the high voltage battery 11.
  • the SOC increases due to the power supply from the motor 13 to the high-voltage battery 11 by the regenerative power generation of the motor 13.
  • the closed circuit voltage CCV increases and the set value of the maximum power WB fluctuates.
  • the maximum power WB is set using the correspondence information between the SOC and the maximum power WB, and as shown by the solid line in FIG. 12 (A), in the correspondence information at the time of charging, the larger the SOC, the maximum.
  • the power WB is set to be large, and the higher the battery temperature TM is, the larger the maximum power WB is set.
  • SOC including ⁇ SOC specifically, SOC obtained by adding ⁇ SOC to SOC (SOC + ⁇ SOC) is used as SOC.
  • the maximum power WB is set based on this SOC.
  • SOH the sum of SOC and ⁇ SOC is referred to as SOH (see FIG. 11).
  • the SOH reaches the upper limit threshold value ST1 before the SOC by supplying power from the motor 13 to the high voltage battery 11.
  • the SOH reaches the upper limit threshold value ST1 it is conceivable to stop charging the high-voltage battery 11 in order to prevent the high-voltage battery 11 from being overcharged.
  • the SOC is a value obtained by subtracting ⁇ SOC from the upper limit threshold value ST1.
  • the correspondence information corresponding to the SOH shifts by ⁇ SOC to the side where the SOL decreases with respect to the correspondence information corresponding to the SOC shown by the solid line. are doing. Therefore, if the charging of the high-voltage battery 11 is stopped when the SOH reaches the upper limit threshold value ST1, the storage capacity of the high-voltage battery 11 for ⁇ SOC cannot be used up.
  • the maximum power WB is set to the reference input power WK1 and the SOC is high until the upper limit threshold value ST1 is reached.
  • the reference input power WK1 is the maximum power WB associated with the upper limit threshold value ST1 in the corresponding information, and is a constant value regardless of the SOC.
  • the maximum power WB is set to the reference input power WK1 and the charging of the high voltage battery 11 is continued.
  • This charging increases the SOC and the closed circuit voltage CCV.
  • This charging is performed until the closed circuit voltage CCV reaches the upper limit voltage VT1, and when the closed circuit voltage CCV reaches the upper limit voltage VT1, that is, when the closed circuit voltage CCV belongs to the high voltage side limiting range XH, FIG. 7 (A)
  • the reference input power WK1 is limited by the correction coefficient shown in. As a result, charging is stopped at the time when the SOC reaches the upper limit threshold value ST1.
  • the upper limit voltage VT1 is set according to the input / output current IB and the battery temperature TM. As shown in FIG. 13 (A), during charging, the larger the input / output current IB, the higher the upper voltage VT1 is set, and the higher the battery temperature TM, the higher the upper voltage VT1 becomes. Is set.
  • FIG. 13A also shows the relationship between the input / output current IB and the closed circuit voltage CCV during charging. At the time of charging, the closed circuit voltage CCV fluctuates toward the high voltage side as the input / output current IB increases.
  • the upper limit voltage VT1 is changed in conjunction with the input / output current IB characteristic of the closed circuit voltage CCV. As a result, it is possible to determine whether the closed circuit voltage CCV has reached the upper limit voltage VT1 under certain conditions regardless of the input / output current IB, and it is possible to prevent the high voltage battery 11 from being overcharged.
  • the SOC is calculated based on the time-integrated value of the input / output current IB, so that ⁇ SOC increases due to the integration of the detection error GI.
  • the ⁇ SOC is reset by updating the SOC based on the closed circuit voltage CCV. That is, when the vehicle is stopped, since the input / output current IB is smaller than the current threshold IT, it is determined that the closed circuit voltage CCV is equivalent to the open circuit voltage OCV, and the SOC is determined based on the closed circuit voltage CCV.
  • the SOC is updated by calculation, and the ⁇ SOC is reset when the SOC is updated. As a result, ⁇ SOC can be reset even during charging / discharging of the high-voltage battery 11.
  • the fluctuation amount ⁇ V of the closed circuit voltage CCV is proportional to the input / output current IB. Therefore, it can be determined whether the vehicle is stopped running based on the closed circuit voltage CCV, that is, whether the input / output current IB is smaller than the current threshold IT.
  • the detection error GI of the current sensor 22 increases due to the increase in the input / output current IB, and the ⁇ SOC increases. Therefore, when resetting ⁇ SOC, it is preferable to reset ⁇ SOC before the vehicle is restarted.
  • the input / output current IB is not zero, so that a detection error GI of the current sensor 22 occurs, and the detection error GI is integrated. Increases ⁇ SOC. Therefore, when resetting the ⁇ SOC while the vehicle is stopped, it is preferable to reset the ⁇ SOC immediately before the vehicle is restarted, and to reset the increased ⁇ SOC while the vehicle is stopped.
  • the restart of the vehicle is determined by the accelerator operation amount AC, and the ⁇ SOC is reset when it is determined that the vehicle is restarted. Therefore, the ⁇ SOC increased while the vehicle is stopped can be reset.
  • the first accelerator threshold value AT1 and the second accelerator threshold value AT2 are defined in determining the resumption of running of the vehicle based on the accelerator operation amount AC, of which the second accelerator threshold value AT2 is a high-voltage battery.
  • the accelerator operation amount is set to generate the minimum electric power that can be driven by the motor 13 by supplying electric power from 11.
  • the first accelerator threshold value AT1 is a threshold value for determining the resumption of traveling of the vehicle, and is set to a value smaller than the second accelerator threshold value AT2. Therefore, it is possible to determine whether the vehicle is resuming driving before the vehicle actually resumes traveling by operating the accelerator by the driver.
  • the second embodiment will be described with reference to FIG. 14, focusing on the differences from the first embodiment.
  • the deterioration degree DE of the high voltage battery 11 is calculated in the control process, and the high voltage side limit range XH and the low voltage side limit range XL are variably set based on the calculated deterioration degree DE.
  • the degree of deterioration DE indicates the ratio of the current full charge capacity CB to the full charge capacity CB in the initial state of the high voltage battery 11.
  • FIG. 14 shows a flowchart of the control process of this embodiment. Note that, in FIG. 14, the same processing as that shown in FIG. 2 above is given the same step number for convenience, and the description thereof will be omitted.
  • the input / output current IB is continued in step S39.
  • the degree of deterioration DE is calculated based on the time integral value of. Specifically, the time integral value of the input / output current IB acquired in a predetermined cycle is calculated, and the deterioration degree DE is calculated so that the larger the time integral value is, the larger the time integral value is.
  • the high voltage side limit range XH is variably set based on the deterioration degree DE calculated in step S39.
  • the upper limit voltage VT1 is set to be on the low voltage side as the deterioration degree DE is larger.
  • step S52 when the discharge of the high voltage battery 11 is continued using the reference output power WK2 set in step S50, the deterioration degree DE is calculated based on the time integral value of the input / output current IB in step S53. ..
  • the low voltage side limit range XL is variably set based on the deterioration degree DE calculated in step S53.
  • the lower limit voltage VT2 is set to be on the high voltage side as the deterioration degree DE is larger.
  • the high voltage side limit range XH and the low voltage side limit range XL are variably set based on the deterioration degree DE of the high voltage battery 11.
  • the maximum value of the storage capacity of the high-voltage battery 11 fluctuates due to deterioration, and the high-voltage side limit range XH and the low-voltage side limit range XL fluctuate accordingly.
  • Deterioration of the high-voltage battery 11 is considered by calculating the deterioration degree DE during charging / discharging of the high-voltage battery 11 and variably setting the high-voltage side limit range XH and the low-voltage side limit range XL based on the deterioration degree DE.
  • the high voltage battery 11 can be appropriately protected.
  • the high-voltage battery 11 is not limited to the lithium ion storage battery lithium, and may be another secondary battery that can be charged and discharged.
  • the high voltage battery 11 may be charged / discharged by setting the maximum current that can be input / output from the high voltage battery 11 based on the SOC.
  • the SOC may be calculated based on a battery model composed of one DC resistor and an RC equivalent circuit. The same applies to the calculation of the degree of deterioration DE.
  • the charging of the high voltage battery 11 is stopped when the closed circuit voltage CCV reaches the upper limit voltage VT1 in the high storage state, but the present invention is not limited to this.
  • the maximum power WB of the high-voltage battery 11 may be limited to prevent the high-voltage battery 11 from being overcharged.
  • the discharge of the high voltage battery 11 is stopped, but the present invention is not limited to this.
  • the maximum power WB of the high-voltage battery 11 may be limited to prevent the high-voltage battery 11 from being over-discharged.
  • the ECU 20 acquires the battery temperature TM using the temperature sensor 15, but the present invention is not limited to this.
  • the ECU 20 may acquire the battery temperature TM by estimating the battery temperature TM based on the accelerator operation amount AC of the driver and the vehicle speed MV.
  • the ⁇ SOC reset may be performed in a state where the input / output current IB is smaller than the current threshold IT.
  • This is an example of a state in which the input / output current IB is smaller than the current threshold IT while the vehicle is stopped, and the input / output current IB is set to the current threshold IT by other methods such as the input / output current IB and the fluctuation amount ⁇ V of the closed circuit voltage CCV. If it can be determined that the state is smaller than that, it is not always necessary to determine that the vehicle is stopped.
  • the determination period YA for determining whether the vehicle is stopped while the vehicle is stopped is equal to the reset cycle of ⁇ SOC, but the present invention is not limited to this, and the reset cycle of ⁇ SOC is the determination period. It may be longer than YA. As a result, the processing load of the ECU 20 is reduced. Further, the reset cycle of ⁇ SOC may be shorter than the determination period YA. As a result, the number of resets of ⁇ SOC is increased, and the increased ⁇ SOC can be suitably reset while the vehicle is stopped without determining the resumption of traveling of the vehicle.
  • the determination may be made based on the brake operation amount and the shift operation position by the driver. Specifically, when the shift operation position is not in neutral and the brake operation amount is smaller than the first brake operation amount, it may be determined that the vehicle is restarted. The vehicle resumes running when the shift operation position is not in neutral and the brake operation amount becomes the second brake operation amount smaller than the first brake operation amount.
  • the controls and techniques described in this disclosure are provided by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program. It may be realized.
  • the control device and method thereof described in the present disclosure may be realized by a dedicated computer provided by configuring a processor with one or more dedicated hardware logic circuits.
  • the control device and method thereof described in the present disclosure may be a combination of a processor and memory programmed to perform one or more functions and a processor composed of one or more hardware logic circuits. It may be realized by one or more dedicated computers configured.
  • the computer program may be stored in a computer-readable non-transitional tangible recording medium as an instruction executed by the computer.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Un dispositif de commande (20) pour commander la charge et la décharge d'un dispositif de stockage d'énergie (11) comprend : une unité d'acquisition de courant (S18) pour acquérir un courant (IB) pendant la charge et la décharge du dispositif de stockage d'énergie à des intervalles réguliers; une unité de calcul d'état (S20) pour calculer un état de charge (SOC) indiquant un état de stockage d'énergie pendant la charge et la décharge du dispositif de stockage d'énergie; une unité d'acquisition de tension (S16) pour acquérir une tension entre des bornes (CCV) pendant la charge et la décharge du dispositif de stockage d'énergie; une unité de détermination de courant (S84) pour déterminer si oui ou non le courant acquis par l'unité d'acquisition de courant est inférieur à un seuil de courant prédéterminé (IT); et une unité de réinitialisation d'erreur (S94) pour réinitialiser, lors d'une détermination que le courant acquis par l'unité d'acquisition de courant est inférieur au seuil de courant, une erreur cumulative d'état de charge (ΔSOC) par mise à jour du SOC sur la base de la tension entre les bornes acquise par l'unité d'acquisition de tension.
PCT/JP2020/012962 2019-04-03 2020-03-24 Dispositif de commande WO2020203455A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112020001789.3T DE112020001789T5 (de) 2019-04-03 2020-03-24 Steuervorrichtung

Applications Claiming Priority (2)

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JP2019-071554 2019-04-03
JP2019071554A JP7021660B2 (ja) 2019-04-03 2019-04-03 制御装置

Publications (1)

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WO2020203455A1 true WO2020203455A1 (fr) 2020-10-08

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JP (1) JP7021660B2 (fr)
DE (1) DE112020001789T5 (fr)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4297232A1 (fr) * 2021-02-26 2023-12-27 Huawei Digital Power Technologies Co., Ltd. Système d'énergie, et procédé de commande de charge et de décharge

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011257226A (ja) * 2010-06-08 2011-12-22 Mazda Motor Corp バッテリの残容量検出方法及び検出装置
JP2012042312A (ja) * 2010-08-18 2012-03-01 Furukawa Electric Co Ltd:The 蓄電デバイスの状態検知方法及びその装置
JP2017032294A (ja) * 2015-07-29 2017-02-09 スズキ株式会社 二次電池の充電率推定方法、充電率推定装置、及び健全度推定装置

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Publication number Priority date Publication date Assignee Title
JP5783122B2 (ja) 2012-04-11 2015-09-24 トヨタ自動車株式会社 電池状態推定装置
JP2019071554A (ja) 2017-10-10 2019-05-09 株式会社デンソー 電子制御装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011257226A (ja) * 2010-06-08 2011-12-22 Mazda Motor Corp バッテリの残容量検出方法及び検出装置
JP2012042312A (ja) * 2010-08-18 2012-03-01 Furukawa Electric Co Ltd:The 蓄電デバイスの状態検知方法及びその装置
JP2017032294A (ja) * 2015-07-29 2017-02-09 スズキ株式会社 二次電池の充電率推定方法、充電率推定装置、及び健全度推定装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4297232A1 (fr) * 2021-02-26 2023-12-27 Huawei Digital Power Technologies Co., Ltd. Système d'énergie, et procédé de commande de charge et de décharge
EP4297232A4 (fr) * 2021-02-26 2024-05-15 Huawei Digital Power Technologies Co., Ltd. Système d'énergie, et procédé de commande de charge et de décharge

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JP2020171144A (ja) 2020-10-15
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