JP2015107022A - Charging/discharging control device of vehicle - Google Patents

Charging/discharging control device of vehicle Download PDF

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JP2015107022A
JP2015107022A JP2013249245A JP2013249245A JP2015107022A JP 2015107022 A JP2015107022 A JP 2015107022A JP 2013249245 A JP2013249245 A JP 2013249245A JP 2013249245 A JP2013249245 A JP 2013249245A JP 2015107022 A JP2015107022 A JP 2015107022A
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voltage battery
charging
charge
battery
high voltage
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崇彦 平沢
Takahiko Hirasawa
崇彦 平沢
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トヨタ自動車株式会社
Toyota Motor Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage for electromobility

Abstract

In a charging mode in which charging is performed from an external power source of a plug-in hybrid vehicle, charging can be performed from a polarized high voltage battery in which charging / discharging is prohibited to a low voltage battery.
When a high voltage battery is in a polarized state, charging / discharging of the battery is prohibited in principle. When the charged amount of the low voltage battery 24 becomes a predetermined value or less, even if charging / discharging of the high voltage battery 16 is prohibited, the high voltage battery 16 is discharged and the low voltage battery 24 is charged with this electric power.
[Selection] Figure 1

Description

  The present invention relates to a vehicle charge / discharge control device including a high voltage battery that can be charged from an external power source and a low voltage battery that can be charged from a high voltage battery.

  As a driving prime mover, a vehicle equipped with an electric motor, such as a hybrid vehicle or an electric vehicle, is known. As a power source for the electric motor, a battery (secondary battery) mounted on the vehicle is generally used. Moreover, it is common to provide a battery having a lower terminal voltage as a power source for electrical components and electrical equipment mounted on the vehicle, in addition to the above-described battery for the power source of the electric motor. Hereinafter, a battery for power source of an electric motor is referred to as a “high voltage battery”, and a battery serving as a power source for electrical components or the like is referred to as a “low voltage battery”.

  In addition to electric vehicles, hybrid vehicles are also known as so-called plug-in hybrid vehicles (PHVs) that can charge a high voltage battery from an external power source such as a household power source. If charging / discharging of a high voltage battery is performed in a state where polarization occurs in the high voltage battery, the amount of charge stored in the battery may not be obtained accurately. Patent Document 1 below discloses a technique in which charging is not performed from an external power source when a high-voltage battery is in a polarized state, and charging is performed after it is estimated that the polarization state is eliminated.

JP 2009-303291 A

  In order to accurately acquire the charged amount, it is conceivable that charging / discharging is not performed on the high-voltage battery when polarization occurs. However, if this is done, charging from the high-voltage battery cannot be performed when the amount of electricity stored in the low-voltage battery is reduced. The low voltage battery supplies electric power to various control devices, and also supplies electric power to the charge / discharge control device that controls charging / discharging of the high voltage battery and the low voltage battery. When the amount of power stored in the low-voltage battery decreases, there is a problem that charge / discharge control cannot be performed.

  An object of the present invention is to enable charging of a low voltage battery even when polarization occurs in the high voltage battery.

  The vehicle charge / discharge control device according to the present invention includes a high voltage battery charge / discharge prohibition unit that inhibits charge / discharge of the high voltage battery and a low voltage battery charge amount detection that detects the charge amount of the low voltage battery when the high voltage battery is in a polarized state. And low-voltage battery charge control for charging the low-voltage battery from the high-voltage battery even if charging / discharging of the high-voltage battery is prohibited by the high-voltage battery charge / discharge prohibition unit Part.

  Normally, charging of the low voltage battery is possible in the polarization state of the high voltage battery in which charging and discharging of the high voltage battery is not performed.

It is a figure which shows the system outline | summary of this embodiment. It is a figure which shows the control flow in charge mode.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system schematic diagram of an electric drive system 10 of a PHV (plug-in hybrid vehicle). This PHV vehicle includes two electric motors 12A and 12B and an internal combustion engine (not shown) as a prime mover for driving the vehicle. The two electric motors 12A and 12B can function as a generator, and the electric motor 12A is driven by an internal combustion engine and mainly functions as a generator. The electric motor 12B functions as an electric motor for driving the vehicle, but also performs regenerative power generation. The electric power generated by the two electric motors 12 </ b> A and 12 </ b> B is stored in the vehicle driving battery 16 of the power storage device 14. The vehicle driving battery 16 is a battery that serves as a power source for the electric motors 12A and 12B, and is a high-voltage battery of this embodiment.

  The electric motors 12 </ b> A and 12 </ b> B are three-phase AC electric motors, and the electric drive system device 10 includes an inverter 18 in order to perform AC / DC power conversion with the high voltage battery 16. Further, the electric drive system device 10 includes a booster circuit 20 that boosts the voltage of the power storage device 14 and supplies the boosted voltage to the inverter 18. The power storage device 14 also supplies power to the air conditioning device 22.

  Furthermore, the PHV of this embodiment includes an auxiliary battery 24 that supplies electric power to electrical components, electrical equipment, and the like. Electrical components, electrical equipment, and the like include, for example, lights such as headlamps and brake lights, indoor illuminators, acoustic devices, and route guidance devices, PHV devices, and electronic control devices that control the devices. . The voltage of the electric power supplied to these electric devices etc. is lower than the voltage of the electric power supplied to the motors 12A and 12B for driving the vehicle. For this reason, the voltage of the auxiliary battery 24 is lower than that of the high voltage battery 16. This auxiliary battery 24 is the low voltage battery of this embodiment. The electric drive system 10 is provided with a voltage converter (DC / DC converter) 26 for charging the low-voltage battery 24. The voltage of the high voltage battery 16 is stepped down by the voltage converter 26 and electric power is supplied to the low voltage battery 24.

  The PHV further includes a charging device 30 for charging the high voltage battery 16 from the external power supply 28. The charging device 30 includes a plug 32 for connecting to the external power source 28. The charging device 30 converts, for example, single-phase 100 V or single-phase 200 V AC power into DC power and supplies the DC power to the power storage device 14. The low voltage battery 24 may be chargeable from the charging device 30.

  The power storage device 14 includes system main relays 34 a and 34 b for connecting the high voltage battery 16 to the inverter 18, and charging relays 36 a and 36 b for connecting the high voltage battery 16 to the charging device 30. An initial main relay 34p and a charging initial relay 36p are provided corresponding to each of these two relays. When connecting the high voltage battery 16 to the inverter 18, the system main relay 34a and the initial main relay 34p are first connected, and then the initial main relay 34p is shut off and the system main relay 34b is connected. By connecting the initial main relay 34p, it is possible to prevent a sudden increase in the current flowing through the high-voltage battery 16 that is connected via the resistor 38 in the initial connection. Similarly, in the initial stage of charging, the high voltage battery 16 and the charging device 30 are connected via the charging initial relay 36p, and a sudden increase in current can be prevented.

  The charge / discharge control of the high voltage battery 16 and the low voltage battery 24 is controlled by the charge / discharge control device 40. The charge / discharge control device 40 includes one or more electronic control devices, and functions as the charge / discharge control device 40 when this or these electronic control devices execute predetermined control. For the sake of simplicity, FIG. 1 shows that the charge / discharge control device 40 is related to the power storage device 14, the voltage converter 26, and the low voltage battery 24. The charging / discharging control of each battery is performed based on the situation of the entire system device 10.

  The charge / discharge control device 40 includes a high voltage battery charge / discharge prohibition unit 42 that prohibits charge / discharge of the high voltage battery 16 when the high voltage battery 16 is polarized. The determination of the occurrence of polarization of the high voltage battery 16 is made based on, for example, the current flowing through the battery 16. When the current, for example, the square value of the current becomes larger than a predetermined value, it is determined that polarization has occurred. It is determined that the polarization state continues even after the current becomes less than the predetermined value, and the polarization state continues until a predetermined time has elapsed. During this time, charging / discharging of the high voltage battery 16 is prohibited in principle. The current flowing through the high voltage battery 16 is detected by, for example, a current sensor 44 provided in the power storage device 14. In the charge / discharge control device 40, it is determined based on the current value detected by the current sensor 44 whether it is in a polarization state. After the current value or the square value of the current exceeds a predetermined value, the elapsed time is counted from the time when it becomes less than the predetermined value. Until the elapsed time reaches a predetermined value, it is determined as a polarization state. For the determination of the occurrence of polarization, a method other than the method based on the above-described current, for example, a method based on the battery temperature can be used.

  In the polarization state, the relationship between the power supplied to the battery, the power discharged from the battery, and the amount of charge stored in the battery is different from the non-polarized state. For this reason, when the battery is charged or discharged in the polarization state, the battery charge amount may not be accurately grasped. In order to increase the accuracy of the charged amount, charging / discharging in the polarization state is generally prohibited.

  However, in the charge / discharge control device 40, when the stored amount of the low voltage battery 24 decreases, power is supplied from the high voltage battery 16 to the low voltage battery 24 contrary to the above principle. The charging device 30 can supply relatively little power, and the low voltage battery 24 may not be sufficiently charged. In the charging mode, power is supplied to some of the electric devices, and the power of the low-voltage battery 24 is consumed. At this time, if the amount of power stored in the low-voltage battery 24 is small and sufficient power is not supplied, the voltage may drop and the charge / discharge control device 40 or the like may not operate. In order to avoid such a state, the low voltage battery 24 is charged from the high voltage battery 16 via the voltage converter 26 having a larger supply power.

  The charge / discharge control device 40 includes a low-voltage battery charge amount detection unit 46 that detects the charge amount of the low-voltage battery 24. The amount of stored electricity can be detected based on the terminal voltage of the low voltage battery 24, for example. If the terminal voltage decreases to, for example, 11 V or less, it is determined that the storage amount has decreased. The charge / discharge control device 40 further includes a low-voltage battery charge control unit 48 that controls charging of the low-voltage battery 24 when the storage amount of the low-voltage battery 24 decreases. The low voltage battery charge control unit 48 controls the voltage converter 26 to charge the low voltage battery 24 from the high voltage battery 16.

  FIG. 2 is a flowchart of control according to a mode in which the electric drive system device 10 is connected to an external power source and can be charged (hereinafter referred to as a charging mode). First, it is determined whether the charging mode is set (S100). Whether the charging mode is selected is determined by whether the plug 32 is connected to the external power source 28. If not in charge mode, it ends. If it is in the charge mode, it is determined whether there is a charge / discharge request (S102). This charge / discharge request indicates whether there is a request for operation of the device that involves charging or discharging at that time, and does not indicate a request for charging or discharging in the future. For example, when a certain time is set and the air conditioner 22 is operated after the lapse of time, it is assumed that there is no discharge request before the set time elapses and there is a discharge request after a predetermined time elapses. The timer setting of the air conditioner 22 includes a method of setting an operation start time and a method of setting a time when the driver gets on, in addition to the operation after the set time has elapsed. In the method of setting the time when the driver gets on, the air conditioner 22 starts to operate in advance so that the desired temperature is reached at that time.

  If there is no charge / discharge request in step S102, the process returns to step S100. On the other hand, when there is a charge / discharge request, it is determined whether the high voltage battery 16 is in a polarized state (S104). The polarization state can be determined based on, for example, the current flowing through the high-voltage battery 16, and the occurrence of polarization is determined when the square value of the current is equal to or greater than a predetermined value, and the square value of the current is less than the predetermined value. Even if it becomes, it is judged that the polarization state continues for a predetermined time. The charge / discharge control device 40 monitors the charge / discharge of the high-voltage battery 16 while the PHV before entering the charge mode is operating, and determines the occurrence of polarization.

  If it is determined in step S104 that the state is not the polarization state, the process proceeds to step S106, and control corresponding to the charge / discharge request is executed. For example, charging control of the high voltage battery 16 from the external power source 28 is executed. In order to execute this control, the charging relays 36a and 36b and the charging initial relay 36p are controlled. As described above, the charging relay 36a and the charging initial relay 36p are initially connected and controlled, and then the charging initial relay 36p is controlled to be disconnected and simultaneously the charging relay 36b is connected and controlled. Then, the charging device 30 charges the high voltage battery 16 from the external power source 28.

  If it is determined in step S104 that the state is polarized, it is determined whether the low voltage battery 24 needs to be charged (S108). If not necessary, the process returns to step S100. In this case, step S106 is avoided and the process returns to step S100. When the high voltage battery 16 is in a polarized state, charging / discharging of this battery is prohibited. On the other hand, if it is determined in step S108 that charging of the low voltage battery 24 is necessary, the system main relay is connected and controlled, and the power of the high voltage battery 16 is discharged and supplied to the low voltage battery 24 via the voltage converter 26. The battery is charged (S110). Then, the process returns to step S100. Whether the low voltage battery 24 needs to be charged can be determined based on the terminal voltage of the low voltage battery 24.

  When the amount of power stored in the low voltage battery 24 is restored, a determination of “No” is made in step S108, and the charging of the low voltage battery 24 is completed. If it is determined that the polarization state of the high-voltage battery 16 has been eliminated (that is, if it is determined that a predetermined time has elapsed), “No” is determined in step S104, and the battery 16 is charged or discharged. An operation involving is performed.

  As described above, the high voltage battery 16 that is basically prohibited from being charged and discharged in the polarization state is controlled to be discharged without being prohibited when the low voltage battery 24 needs to be charged. As a result, the voltage of the low voltage battery 24 is reduced, and the power supply to the electrical equipment is prevented from being cut off.

  DESCRIPTION OF SYMBOLS 10 Electric drive system apparatus, 12A, 12B Electric motor, 14 Electric power storage apparatus, 16 High voltage battery (vehicle drive battery), 24 Low voltage battery (auxiliary battery), 26 Voltage converter, 28 External power supply, 30 Charging apparatus, 32 Plug , 40 charge / discharge control device, 42 high voltage battery charge / discharge prohibition unit, 46 low voltage battery charge amount detection unit, 48 low voltage battery charge control unit.

Claims (1)

  1. A vehicle charge / discharge control device comprising a high voltage battery that can be charged from an external power source and a low voltage battery that can be charged from a high voltage battery,
    When the high-voltage battery is in a polarized state, a high-voltage battery charge / discharge prohibition unit that prohibits charge / discharge of the high-voltage battery;
    A low voltage battery storage amount detection unit for detecting a storage amount of the low voltage battery;
    A low voltage battery charge control unit that charges the low voltage battery from the high voltage battery, even if the charge of the high voltage battery is prohibited by the high voltage battery charge / discharge prohibition unit,
    A vehicle charge / discharge control device.
JP2013249245A 2013-12-02 2013-12-02 Charging/discharging control device of vehicle Pending JP2015107022A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107627881A (en) * 2017-09-18 2018-01-26 电子科技大学 A kind of discharge and recharge of electric automobile and motor driving integrated apparatus

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007121030A (en) * 2005-10-26 2007-05-17 Denso Corp Internal status detection system for vehicular electric storage device
JP2009303291A (en) * 2008-06-10 2009-12-24 Toyota Motor Corp Vehicle and control method thereof
JP2010213501A (en) * 2009-03-11 2010-09-24 Omron Corp Power supply control device, method, and program
JP2012050281A (en) * 2010-08-30 2012-03-08 Toyota Motor Corp Battery charging system of electric vehicle
JP2012244723A (en) * 2011-05-18 2012-12-10 Toyota Motor Corp Charge/discharge controller of power storage device and electric vehicle loading the same
JP2013158087A (en) * 2012-01-27 2013-08-15 Toyota Motor Corp Power storage system and charged state estimation method
JP2013214371A (en) * 2012-03-30 2013-10-17 Toyota Motor Corp Battery system and estimation method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007121030A (en) * 2005-10-26 2007-05-17 Denso Corp Internal status detection system for vehicular electric storage device
JP2009303291A (en) * 2008-06-10 2009-12-24 Toyota Motor Corp Vehicle and control method thereof
JP2010213501A (en) * 2009-03-11 2010-09-24 Omron Corp Power supply control device, method, and program
JP2012050281A (en) * 2010-08-30 2012-03-08 Toyota Motor Corp Battery charging system of electric vehicle
JP2012244723A (en) * 2011-05-18 2012-12-10 Toyota Motor Corp Charge/discharge controller of power storage device and electric vehicle loading the same
JP2013158087A (en) * 2012-01-27 2013-08-15 Toyota Motor Corp Power storage system and charged state estimation method
JP2013214371A (en) * 2012-03-30 2013-10-17 Toyota Motor Corp Battery system and estimation method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107627881A (en) * 2017-09-18 2018-01-26 电子科技大学 A kind of discharge and recharge of electric automobile and motor driving integrated apparatus

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