Power supply system and vehicle

• US 7,847,432 B2
• Filed: 04/16/2007
• Issued: 12/07/2010
• Est. Priority Date: 04/24/2006
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ichikawa, Shinji
• Primary Examiner(s): Fureman; Jared J
• Assistant Examiner(s): Fauth; Justen
• Application Number:
  US12/225,694
• Publication Number:
  US 20090273235A1
• Time in Patent Office: 1,331 Days
• Field of Search: None
• US Class Current: 307/45
• CPC Class Codes: B60L 15/2009 for braking
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 2210/10 DC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• 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 58/10 for monitoring or controlling batteries
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: B60L 7/14 for vehicles propelled by ac motors
• CPC Class Codes: H02J 1/102 being switching converters H02J1/108, H02J1/12 take precedence
• CPC Class Codes: H02M 1/0025 Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
• 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

Abstract

Transfer functions of control have duty commands as inputs and battery current values as outputs, provided corresponding to respected converters. Control gains are determined such that certain transfer functions substantially match with each other, with respect to delay elements.

Claims

1. A power supply system having a plurality of power storage units each configured to be chargeable/dischargeable, comprising:

a power line configured to allow supply/reception of electric power between a load device and said power supply system;

a plurality of voltage conversion units provided between said plurality of power storage units and said power line, respectively, and each performing voltage conversion operation between corresponding said power storage unit and said power line; and

a battery current value detection unit detecting a battery current value of each of said plurality of power storage units,

at least one of said plurality of voltage conversion units having voltage conversion capability different from that of other of said plurality of voltage conversion units,

each of said plurality of voltage conversion units being controlled by a control system including a first feedback unit performing said voltage conversion operation such that the battery current value of corresponding said power storage unit matches a reference current value, the control system includes a voltage feedforward unit causing a value based on a battery voltage value, taken between corresponding said power storage unit and said voltage conversion unit, and a reference voltage value to be reflected in an output of said first feedback unit,

a control gain in said first feedback unit being determined such that time taken from when a standard reference value is applied to said first feedback unit to when a current value generated by said voltage conversion operation in corresponding said voltage conversion unit reaches a standard output value substantially matches time taken from when the standard reference value is applied to another said first feedback unit to when a current value generated by said voltage conversion operation in corresponding another said voltage conversion unit reaches the standard output value.

2. The power supply system according to claim 1, wherein the control gain in said first feedback unit is determined such that a transfer function including said first feedback unit and corresponding said voltage conversion unit substantially matches a transfer function including said other first feedback unit and corresponding said other voltage conversion unit, with respect to delay elements.

3. The power supply system according to claim 1, further comprising a supply voltage value detection unit detecting a voltage value on said power line,

wherein said reference current value is determined by a second feedback unit, said second feedback unit setting said voltage conversion operation such that the voltage value on said power line detected by said supply voltage value detection unit matches said reference voltage value.

4. The power supply system according to claim 3, wherein said voltage feedforward unit causes a value corresponding to a ratio between said battery voltage value of corresponding said power storage unit and said reference voltage value to be reflected in said output of said first feedback unit.

5. The power supply system according to claim 1, wherein each of said plurality of voltage conversion units includes a chopper circuit.

6. A vehicle, comprising:

a power supply system having a plurality of power storage units each configured to be chargeable/dischargeable; and

a drive force generation unit receiving electric power supplied from said power supply system to generate drive force,

said power supply system including;

a power line configured to allow supply/reception of electric power between said drive force generation unit and said power supply system;

a plurality of voltage conversion units provided between said plurality of power storage units and said power line, respectively, and each performing voltage conversion operation between corresponding said power storage unit and said power line; and

a battery current value detection unit detecting a battery current value of each of said plurality of power storage units,

at least one of said plurality of voltage conversion units having voltage conversion capability different from that of other of said plurality of voltage conversion units,

each of said plurality of voltage conversion units being controlled by a control system including a first feedback unit performing said voltage conversion operation such that the battery current value of corresponding said power storage unit matches a reference current value, the control system includes a voltage feedforward unit causing a value based on a battery voltage value, taken between corresponding said power storage unit and said voltage conversion unit, and a reference voltage value to be reflected in an output of said first feedback unit,

a control gain in said first feedback unit being determined such that time taken from when a standard reference value is applied to said first feedback unit to when a current value generated by said voltage conversion operation in corresponding said voltage conversion unit reaches a standard output value substantially matches time taken from when the standard reference value is applied to another said first feedback unit to when a current value generated by said voltage conversion operation in corresponding another said voltage conversion unit reaches the standard output value.

7. The vehicle according to claim 6, wherein said drive force generation unit includes:

at least one power conversion unit configured to be capable of converting the electric power supplied from said power supply system, and

at least one electric rotating machine connected to corresponding said power conversion unit and configured to be capable of generating said drive force.

8. The vehicle according to claim 6, wherein the control gain in said first feedback unit is determined such that a transfer function including said first feedback unit and corresponding said voltage conversion unit substantially matches a transfer function including said other first feedback unit and corresponding said other voltage conversion unit, with respect to delay elements.

9. The vehicle according to claim 6, wherein

said power supply system further includes a supply voltage value detection unit detecting a voltage value on said power line, and

said reference current value is determined by a second feedback unit, said second feedback unit setting said voltage conversion operation such that the voltage value on said power line detected by said supply voltage value detection unit matches said reference voltage value.

10. The vehicle according to claim 9, wherein said voltage feedforward unit causes a value corresponding to a ratio between a battery voltage value of corresponding said power storage unit and said reference voltage value to be reflected in said output of said first feedback unit.

11. The vehicle according to claim 6, wherein each of said plurality of voltage conversion units includes a chopper circuit.

12. A power supply system having a plurality of power storage units each configured to be chargeable/dischargeable, comprising:

a power line configured to allow supply/reception of electric power between a load device and said power supply system;

a plurality of voltage conversion units provided between said plurality of power storage units and said power line, respectively, and each performing voltage conversion operation between corresponding said power storage unit and said power line; and

a supply voltage value detection unit detecting a voltage value on said power line,

at least one of said plurality of voltage conversion units having voltage conversion capability different from that of other of said plurality of voltage conversion units,

each of said plurality of voltage conversion units being controlled by a control system including a first feedback unit performing said voltage conversion operation such that the voltage value on said power line detected by said supply voltage value detection unit matches a reference voltage value, the control system includes a voltage feedforward unit causing a value based on a battery voltage value, taken between corresponding said power storage unit and said voltage conversion unit, and a reference voltage value to be reflected in an output of said first feedback unit,

a control gain in said first feedback unit being determined such that time taken from when a standard reference value is applied to said first feedback unit to when a voltage value generated by said voltage conversion operation in corresponding said voltage conversion unit reaches a standard output value substantially matches time taken from when the standard reference value is applied to another said first feedback unit to when a voltage value generated by said voltage conversion operation in corresponding another said voltage conversion unit reaches the standard output value.

13. The power supply system according to claim 12, wherein the control gain in said first feedback unit is determined such that a transfer function including said first feedback unit and corresponding said voltage conversion unit substantially matches a transfer function including said other first feedback unit and corresponding said other voltage conversion unit, with respect to delay elements.

14. The power supply system according to claim 13, wherein said voltage feedforward unit causes a value corresponding to a ratio between said battery voltage value of corresponding said power storage unit and said reference voltage value to be reflected in said output of said first feedback unit.

15. The power supply system according to claim 12, wherein each of said plurality of voltage conversion units includes a chopper circuit.

16. A vehicle, comprising:

a power supply system having a plurality of power storage units each configured to be chargeable/dischargeable; and

a drive force generation unit receiving electric power supplied from said power supply system to generate drive force,

said power supply system including;

a power line configured to allow supply/reception of electric power between said drive force generation unit and said power supply system;

a plurality of voltage conversion units provided between said plurality of power storage units and said power line, respectively, and each performing voltage conversion operation between corresponding said power storage unit and said power line; and

a supply voltage value detection unit detecting a voltage value on said power line,

at least one of said plurality of voltage conversion units having voltage conversion capability different from that of other of said plurality of voltage conversion units,

each of said plurality of voltage conversion units being controlled by a control system including a first feedback unit performing said voltage conversion operation such that the voltage value on said power line detected by said supply voltage value detection unit matches a reference voltage value, the control system includes a voltage feedforward unit causing a value based on a battery voltage value, taken between corresponding said power storage unit and said voltage conversion unit, and a reference voltage value to be reflected in an output of said first feedback unit;

a control gain in said first feedback unit being determined such that time taken from when a standard reference value is applied to said first feedback unit to when a voltage value generated by said voltage conversion operation in corresponding said voltage conversion unit reaches a standard output value substantially matches time taken from when the standard reference value is applied to another said first feedback unit to when a voltage value generated by said voltage conversion operation in corresponding another said voltage conversion unit reaches the standard output value.

17. The vehicle according to claim 16, wherein said drive force generation unit includes:

at least one power conversion unit configured to be capable of converting the electric power supplied from said power supply system, and

at least one electric rotating machine connected to corresponding said power conversion unit and configured to be capable of generating said drive force.

18. The vehicle according to claim 16, wherein the control gain in said first feedback unit is determined such that a transfer function including said first feedback unit and corresponding said voltage conversion unit substantially matches a transfer function including said other first feedback unit and corresponding said other voltage conversion unit, with respect to delay elements.

19. The vehicle according to claim 18, wherein said voltage feedforward unit causes a value corresponding to a ratio between said battery voltage value of corresponding said power storage unit and said reference voltage value to be reflected in said output of said first feedback unit.

20. The vehicle according to claim 16, wherein each of said plurality of voltage conversion units includes a chopper circuit.