Charging control apparatus for power storage device and method for controlling charging of power storage device

• US 8,666,572 B2
• Filed: 09/02/2008
• Issued: 03/04/2014
• Est. Priority Date: 09/10/2007
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Mitsutani, Noritake
• Primary Examiner(s): HOLLOWAY, JASON R
• Application Number:
  US12/672,342
• Publication Number:
  US 20100318250A1
• Time in Patent Office: 2,009 Days
• Field of Search: 701/22, 701/36, 701/99, 701/31.4, 701/34.4, 320/109, 320/111, 180/65.27, 180/65.29
• US Class Current: 701/22
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 2001/0416 Arrangement in the rear part of the vehicle
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60L 53/14 Conductive energy transfer
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/24 for controlling the temperature of batteries
• CPC Class Codes: B60W 10/24 including control of energy storage means
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 2510/24 Energy storage means
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2510/246 Temperature
• CPC Class Codes: B60W 2710/24 Energy storage means
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 : Electric charging stations
• CPC Class Codes: Y02T 90/14 : Plug-in electric vehicles

Abstract

In an external charging mode of a plug-in hybrid vehicle, electric power from an external power supply electrically connected to a connector is converted and supplied to a power line electrically connected to a battery and an electric air-conditioning device. If charge allowable power of the battery is smaller than or equal to a prescribed value when the electric air-conditioning device is operated, a DFR is opened to stop electric power supply from the external power supply and drive the electric air-conditioning device by electric power of the battery. As a result, even if the consumed power of the electric air-conditioning device is suddenly decreased, the inflow of surplus electric power that cannot be absorbed by the battery from the external power supply can be prevented.

Claims

1. A system having a charging control apparatus for a power storage device mounted on an electric powered vehicle, the charging control apparatus comprising:

a condition setting unit configured to set charge allowable power based on a state of said power storage device; and

a drive control unit configured to

stop an electric power supply from an external power supply of said electric powered vehicle and drive a vehicle-mounted electric load by electric power supplied from said power storage device, if said charge allowable power is smaller than or equal to a prescribed electric power margin when said vehicle-mounted electric load is operated in an external charging mode in which said power storage device is charged by said external power supply, and

drive said vehicle-mounted electric load by the electric power supplied from the external power supply, if said charge allowable power is larger than the prescribed electric power margin when said vehicle-mounted electric load is operated in said external charging mode,

wherein said drive control unit is configured to reversibly control stop and provision of the electric power supply from the external power supply in said external charging mode.

2. The system according to claim 1, wherein

said electric powered vehicle includes

a power feeding line electrically connected to said external power supply via a charging cable and an inlet in said external charging mode,

a power line electrically connected to said vehicle-mounted electric load and said power storage device,

a charger provided between said power feeding line and said power line, configured to convert the electric power supplied from said external power supply to electric power with which said power storage device is charged, and output the electric power to said power line, and

an opening/closing device interposed between and connected to said power feeding line, and

said drive control unit opens said opening/closing device if said charge allowable power is smaller than or equal to said electric power margin.

3. The system according to claim 2, wherein said drive control unit closes said opening/closing device if said charge allowable power increases to larger than or equal to a prescribed value when said vehicle-mounted electric load is driven with said opening/closing device opened.

4. The system according to claim 1, wherein

said electric powered vehicle includes

a power feeding line electrically connected to said external power supply via a charging cable and an inlet,

a power line electrically connected to said vehicle-mounted electric load and said power storage device,

a charger provided between said power feeding line and said power line, configured to convert the electric power supplied from said external power supply to electric power with which said power storage device is charged, and output the electric power to said power line, and

an opening/closing device interposed between and connected to said power feeding line,

said charging control apparatus further comprising:

a charging control unit configured to control an operation of said charger such that electric power in accordance with a charging command is supplied from said external power supply, and

said drive control unit sets said charging command such that the electric power supplied from said external power supply is substantially 0 with said opening/closing device maintained in a closing state, if said charge allowable power is smaller than or equal to said electric power margin.

5. The system according to claim 4, wherein said charging control unit maintains a power semiconductor switching element included in said charger in an OFF state, if said charging command is set such that the electric power supplied from said external power supply is substantially 0.

6. The system according to claim 1, wherein

said electric powered vehicle includes

a power feeding line electrically connected to said external power supply via a charging cable and an inlet,

a power line electrically connected to said vehicle-mounted electric load and said power storage device, and

a charger provided between said power feeding line and said power line, configured to convert the electric power supplied from said external power supply to electric power with which said power storage device is charged, and output the electric power to said power line,

said charging control apparatus further comprising:

a charging control unit configured to control an operation of said charger such that electric power in accordance with a charging command is supplied from said external power supply, and

said drive control unit sets said charging command such that the electric power supplied from said external power supply is limited to smaller than or equal to electric power obtained by subtracting said electric power margin from said charge allowable power.

7. The system according to claim 6, wherein said vehicle-mounted electric load is driven by the electric power supplied from both said power storage device and said external power supply, if a requested charging power of said power storage device is 0 and if a requested consumed power of said vehicle-mounted electric load is larger than the electric power supplied from said external power supply in accordance with said charging command.

8. The system according to claim 7, wherein

said condition setting unit further sets discharge allowable power based on the state of said power storage device, and

said drive control unit decreases the requested consumed power of said vehicle-mounted electric load if said requested consumed power is larger than a sum of said discharge allowable power and the electric power supplied from said external power supply in accordance with said charging command.

9. The system according to claim 1, wherein said electric power margin is variably set in accordance with present consumed power of said vehicle-mounted electric load.

10. The system according to claim 1, wherein said vehicle-mounted electric load includes an electric air-conditioning device.

11. A method for controlling charging of a power storage device mounted on an electric powered vehicle, comprising an electronic control unit (ECU) including control logic configured to perform the following steps of:

setting charge allowable power (Win) based on a state of said power storage device;

stopping an electric power supply from an external power supply of said electric powered vehicle and driving a vehicle-mounted electric load by electric power supplied from said power storage device, if said charge allowable power is smaller than or equal to a prescribed electric power margin when said vehicle-mounted electric load is operated in an external charging mode in which said power storage device is charged by said external power supply; and

driving said vehicle-mounted electric load by the electric power supplied from the external power supply, if said charge allowable power is larger than said prescribed electric power margin when said vehicle-mounted electric load is operated in said external charging mode,

wherein stop and provision of the electric power supply from the external power supply are reversibly controlled in said external charging mode.

12. The method for controlling charging of a power storage device according to claim 11, wherein

said electric powered vehicle includes

a power feeding line electrically connected to said external power supply via a charging cable and an inlet in said external charging mode,

a power line electrically connected to said vehicle-mounted electric load and said power storage device,

a charger provided between said power feeding line and said power line, configured to convert the electric power supplied from said external power supply to electric power with which said power storage device is charged, and output the electric power to said power line, and

an opening/closing device interposed between and connected to said power feeding line, and

said method for controlling further comprising the step of opening said opening/closing device if said charge allowable power is smaller than or equal to said electric power margin.

13. The method for controlling charging of a power storage device according to claim 12, further comprising the step of closing said opening/closing device if said charge allowable power increases to larger than or equal to a prescribed value when said vehicle-mounted electric load is driven with said opening/closing device opened.

14. The method for controlling charging of a power storage device according to claim 11, wherein

said electric powered vehicle includes

a power feeding line electrically connected to said external power supply via a charging cable and an inlet,

a power line electrically connected to said vehicle-mounted electric load and said power storage device,

a charger provided between said power feeding line and said power line, configured to convert the electric power supplied from said external power supply to electric power with which said power storage device is charged, and output the electric power to said power line,

an opening/closing device interposed between and connected to said power feeding line, and

a charging control unit configured to control an operation of said charger such that electric power in accordance with a charging command is supplied from said external power supply, and

said step of driving includes a step of setting said charging command such that the electric power supplied from said external power supply is substantially 0 with said opening/closing device maintained in a closing state, if said charge allowable power (Win) is smaller than or equal to said electric power margin.

15. The method for controlling charging of a power storage device according to claim 14, wherein said charging control unit maintains a power semiconductor switching element included in said charger in an OFF state, if said charging command is set such that the electric power supplied from said external power supply is substantially 0.

16. The method for controlling charging of a power storage device according to claim 11, wherein

said electric powered vehicle includes

a power feeding line electrically connected to said external power supply via a charging cable and an inlet,

a power line electrically connected to said vehicle-mounted electric load and said power storage device,

a charger provided between said power feeding line and said power line, configured to convert the electric power supplied from said external power supply to electric power with which said power storage device is charged, and output the electric power to said power line, and

a charging control unit configured to control an operation of said charger such that electric power in accordance with a charging command is supplied from said external power supply, and

said method for controlling further comprising the step of

setting said charging command such that the electric power supplied from said external power supply is limited to smaller than or equal to electric power obtained by subtracting said electric power margin from said charge allowable power.

17. The method for controlling charging of a power storage device according to claim 16, further comprising the step of

driving said vehicle-mounted electric load by the electric power supplied from both said power storage device and said external power supply, if a requested charging power of said power storage device is 0 and if a requested consumed power of said vehicle-mounted electric load is larger than the electric power supplied from said external power supply in accordance with said charging command.

18. The method for controlling charging of a power storage device according to claim 17, further comprising the step of:

setting discharge allowable power based on the state of said power storage device; and

decreasing the requested consumed power of said vehicle-mounted electric load if said requested consumed power is larger than a sum of said discharge allowable power and the electric power supplied from said external power supply in accordance with said charging command.

19. The method for controlling charging of a power storage device according to claim 11, wherein said electric power margin is variably set in accordance with present consumed power of said vehicle-mounted electric load.

20. The method for controlling charging of a power storage device according to claim 11, wherein said vehicle-mounted electric load includes an electric air-conditioning device.