VEHICLE POWER SUPPLY SYSTEM AND METHOD FOR CONTROLLING THE SAME

• US 20120022744A1
• Filed: 09/09/2009
• Published: 01/26/2012
• Est. Priority Date: 09/09/2009
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Endo, Hiroki
• Granted Patent: US 8,639,413 B2
• Time in Patent Office: Days
• US Class Current: 701/36
• CPC Class Codes: B60H 1/00392 for electric vehicles having only electric drive means
• CPC Class Codes: B60H 1/00428 electric
• CPC Class Codes: B60L 1/04 fed by the power supply line
• CPC Class Codes: B60L 53/00 Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
• CPC Class Codes: B60L 53/56 Mechanical storage means, e.g. fly wheels
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 16/00 Structural combinations of different types of electrochemical generators
• CPC Class Codes: H01M 16/006 of fuel cells with rechargeable batteries
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/50 Fuel cells
• 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 10/88 Optimized components or subsystems, e.g. lighting, actively controlled glasses
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A power supply system comprises a chargeable power storage device; a charging device configured to perform external charging for charging the power storage device using alternating-current power supplied from an external power supply; an air conditioner receiving electric power from the charging device and the power storage device and air-conditioning a compartment in a vehicle; an auxiliary machinery load; and an ECU. The ECU controls at least one of the charging device and the auxiliary machinery load so as to increase the electric power output from the power storage device in a case where overcharging of the power storage device is expected when the air conditioner is intermittently operated during external charging.

Claims

1. A vehicle power supply system comprising:

a chargeable power storage device;

a charging device configured to perform external charging for charging said power storage device using alternating-current power supplied from an external power supply;

an air conditioner receiving electric power from said charging device and said power storage device and air-conditioning a compartment in a vehicle;

an auxiliary machinery load receiving the electric power from said power storage device; and

a control device for controlling at least one of said charging device and said auxiliary machinery load as to increase the electric power output from said power storage device in a case where overcharging of said power storage device is expected when said air conditioner is intermittently operated during said external charging.

2. The vehicle power supply system according to claim 1, wherein said control device detects a state of charge of said power storage device, and, when the state of charge of said power storage device is greater than a first reference value, causes said charging device to stop supplying the electric power.

3. The vehicle power supply system according to claim 2, wherein said control device sets a discharge power upper limit value of said power storage device based on the state of charge of said power storage device, and, in a case where the electric power output from said power storage device exceeds said discharge power upper limit value, causes said charging device to output an excess amount of the electric power over said discharge power upper limit value even when the state of charge of said power storage device is greater than said first reference value.

4. The vehicle power supply system according to claim 2, wherein said control device increases the electric power output from said charging device when the state of charge of said power storage device is less than a second reference value less than said first reference value.

5. The vehicle power supply system according to claim 4, wherein said second reference value is a charge target value at a time when the external charging for said power storage device is completed.

6. The vehicle power supply system according to claim 1, wherein said control device detects a state of charge of said power storage device, and, when the state of charge of said power storage device is greater than a first reference value, causes said auxiliary machinery load to consume the electric power stored in said power storage device.

7. The vehicle power supply system according to claim 6, wherein said control device causes said auxiliary machinery load to stop consuming the electric power stored in said power storage device when the state of charge of said power storage device is less than a second reference value less than said first reference value.

8. The vehicle power supply system according to claim 1, wherein said power storage device includes a plurality of power storage devices.

9. A method for controlling a vehicle power supply system,

a vehicle including

a chargeable power storage device,

a charging device configured to perform external charging for charging said power storage device using AC power supplied from an external power supply,

an air conditioner receiving electric power from said charging device and said power storage device and air-conditioning a compartment in said vehicle, and

an auxiliary machinery load receiving the electric power from said power storage device,

said method for controlling comprising the steps of:

causing said air conditioner to operate during said external charging; and

controlling at least one of said charging device and said auxiliary machinery load so as to increase the electric power output from said power storage device, in a case where overcharging of said power storage device is expected when said air conditioner is intermittently operated.

10. The method for controlling a vehicle power supply system according to claim 9, further comprising the steps of:

detecting a state of charge of said power storage device; and

causing said charging device to stop supplying the electric power when the state of charge of said power storage device is greater than a first reference value.

11. The method for controlling a vehicle power supply system according to claim 10, further comprising the steps of:

setting a discharge power upper limit value of said power storage device based on the state of charge of said power storage device; and

causing said charging device to output an excess amount of the electric power over said discharge power upper limit value even when the state of charge of said power storage device is greater than said first reference value, in a case where the electric power output from said power storage device exceeds said discharge power upper limit value.

12. The method for controlling a vehicle power supply system according to claim 10, further comprising the step of increasing the electric power output from said charging device when the state of charge of said power storage device is less than a second reference value less than said first reference value.

13. The method for controlling a vehicle power supply system according to claim 9, further comprising the steps of:

detecting a state of charge of said power storage device; and

causing said auxiliary machinery load to consume the electric power stored in said power storage device when the state of charge of said power storage device is greater than a first reference value.

14. The method for controlling a vehicle power supply system according to claim 13, further comprising the step of causing said auxiliary machinery load to stop consuming the electric power stored in said power storage device when the state of charge of said power storage device is less than a second reference value less than said first reference value.