Power supply system, vehicle including the power supply system, control method for power supply system, and computer-readable recording medium having program recorded thereon for computer to execute the control method

• US 20100096918A1
• Filed: 09/27/2007
• Published: 04/22/2010
• Est. Priority Date: 09/28/2006
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Sawada, Hiroki, Komatsu, Masayuki
• Granted Patent: US 7,952,224 B2
• Time in Patent Office: Days
• US Class Current: 307/9.1
• CPC Class Codes: B60K 6/28 characterised by the electric energy storing means, e.g. batteries or capacitors
• CPC Class Codes: B60L 15/2009 for braking
• CPC Class Codes: B60L 2210/12 Buck converters
• CPC Class Codes: B60L 2210/14 Boost converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2240/423 Torque
• 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 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: B60L 58/20 having different nominal voltages
• CPC Class Codes: B60L 58/22 Balancing the charge of battery modules
• CPC Class Codes: B60L 7/14 for vehicles propelled by ac motors
• 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 2510/244 Charge state
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H02J 7/0018 using separate charge circuits
• CPC Class Codes: H02J 7/1423 with multiple batteries
• CPC Class Codes: H02J 7/143 : with multiple generators
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• 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 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y10S 903/907 : Electricity storage, e.g. battery, capacitor

Abstract

A discharge share ratio calculation unit (52) calculates, for each power storage device, a remaining electric power quantity before an SOC is reached with respect to which an allowable discharge electric power is restricted, and calculates a discharge power share ratio between power storage devices according to the ratio of the remaining electric power quantity. A charge share ratio calculation unit (54) calculates, for each power storage device, a chargeable quantity before an SOC is reached with respect to which an allowable charge electric power is restricted, and calculates a charge power share ratio between power storage devices according to the ratio of the chargeable quantity. When electric power is supplied from a power supply system to a drive force generation unit, each converter is controlled according to the discharge power share ratio and, when electric power is supplied from the drive force generation unit to the power supply system, each converter is controlled according to the discharge power share ratio.

Claims

1. A power supply system capable of supplying and receiving electric power to and from a load device, comprising:

a plurality of chargeable power storage devices;

an electric power line for supplying and receiving electric power between the power supply system and said load device;

a plurality of converters provided in association with said plurality of power storage devices and each performing voltage conversion between an associated power storage device and said electric power line; and

a control device controlling said plurality of converters,

said control device including;

a share ratio calculation unit performing at least one of a first calculation to determine a discharge power share ratio between respective electric powers to be discharged from said plurality of power storage devices, and a second calculation to determine a charge power share ratio between respective electric powers to be used for charging said plurality of power storage devices; and

a converter control unit performing at least one of a first control to control said plurality of converters according to said discharge power share ratio when electric power is supplied from the power supply system to said load device, and a second control to control said plurality of converters according to said charge power share ratio when electric power is supplied from said load device to the power supply system, wherein

said first calculation is performed to determine, for each of said plurality of power storage devices, a remaining electric power quantity before a state of charge is reached with respect to which an allowable discharge electric power representing a maximum value of electric power that can be instantaneously output is restricted, and determine said discharge power share ratio according to a ratio of said remaining electric power quantity between said plurality of power storage devices, and

said second calculation is performed to determine, for each of said plurality of power storage devices, a chargeable quantity before a state of charge is reached with respect to which an allowable charge electric power representing a maximum value of electric power that can be instantaneously input is restricted, and determine said charge power share ratio according to a ratio of said chargeable quantity between said plurality of power storage devices.

2. The power supply system according to claim 1, wherein

said first calculation is performed to determine said remaining electric power quantity of each of said plurality of power storage devices, based on a value determined by subtracting, from a first state value representing a current state of charge, a second state value representing a state of charge at which restriction of said allowable discharge electric power is started, and based on a power storage capacity of an associated power storage device, and

said second calculation is performed to determine said chargeable quantity of each of said plurality of power storage devices, based on a value determined by subtracting said first state value from a third state value representing a state of charge at which restriction of said allowable charge electric power is started, and based on a power storage capacity of an associated power storage device.

3. The power supply system according to claim 1, wherein

said control device further includes a correction unit correcting said discharge power share ratio and said charge power share ratio such that an imbalance between respective states of charge of said plurality of power storage devices is corrected.

4. The power supply system according to claim 3, wherein

said plurality of power storage devices include a first power storage device and a second power storage device, and

said correction unit corrects said discharge power share ratio and said charge power share ratio according to a difference between a state value representing a state of charge of said first power storage device and a state value representing a state of charge of said second power storage device.

5. The power supply system according to claim 1, wherein

at least one of said plurality of power storage devices includes a plurality of power storage units connected in parallel to each other to an associated converter,

said first calculation for the power storage device including said plurality of power storage units is performed to determine a remaining electric power quantity of the power storage device by determining a sum of respective remaining electric power quantities of said plurality of power storage units, and

said second calculation for the power storage device including said plurality of power storage units is performed to determine a chargeable quantity of the power storage device by determining a sum of respective chargeable quantities of said plurality of power storage units.

6. The power supply system according to claim 5, further comprising a plurality of system main relays provided in association with said plurality of power storage units, and electrically connecting and disconnecting an associated power storage unit and the converter associated with the power storage device including said plurality of power storage units to and from each other, wherein

said converter control unit further controls operation of said plurality of system main relays such that said plurality of power storage units are used in a specified order and the order of use is switched at a specified timing.

7. The power supply system according to claim 5, wherein

said plurality of power storage units are used simultaneously.

8. The power supply system according to claim 5, wherein

said converter control unit alternately operates said plurality of converters and gate-blocks a non-operated converter, when a requested electric power of said load device is within a range of the allowable charge electric power and the allowable discharge electric power of each of said plurality of power storage devices.

9. A vehicle comprising:

the power supply system as recited in claim 1; and

a drive force generation unit receiving electric power supplied from said power supply system to generate a drive force for the vehicle.

19. A vehicle comprising:

the power supply system as recited in claim 2; and

a drive force generation unit receiving electric power supplied from said power supply system to generate a drive force for the vehicle.

20. A vehicle comprising:

the power supply system as recited in claim 3; and

a drive force generation unit receiving electric power supplied from said power supply system to generate a drive force for the vehicle.

21. A vehicle comprising:

the power supply system as recited in claim 4; and

a drive force generation unit receiving electric power supplied from said power supply system to generate a drive force for the vehicle.

22. A vehicle comprising:

the power supply system as recited in claim 5; and

a drive force generation unit receiving electric power supplied from said power supply system to generate a drive force for the vehicle.

23. A vehicle comprising:

the power supply system as recited in claim 6; and

a drive force generation unit receiving electric power supplied from said power supply system to generate a drive force for the vehicle.

24. A vehicle comprising:

the power supply system as recited in claim 7; and

a drive force generation unit receiving electric power supplied from said power supply system to generate a drive force for the vehicle.

25. A vehicle comprising:

the power supply system as recited in claim 8; and

a drive force generation unit receiving electric power supplied from said power supply system to generate a drive force for the vehicle.

10-18. -18. (canceled)