Power Supply System, Vehicle Using the Same and its Control Method

• US 20090243385A1
• Filed: 07/02/2007
• Published: 10/01/2009
• Est. Priority Date: 07/10/2006
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ichikawa, Shinji
• Granted Patent: US 7,928,603 B2
• Time in Patent Office: Days
• US Class Current: 307/9.100
• 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 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/04 Cutting off the power supply under fault conditions protective devices and circuit arrangements in general H01H; H02H
• 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 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: H02J 7/1423 with multiple batteries
• CPC Class Codes: H02J 7/1492 by means of controlling devices between the generator output and the battery
• CPC Class Codes: H02M 3/1582 Buck-boost converters H02M3/1584 takes precedence
• CPC Class Codes: H02M 3/1584 with a plurality of power processing stages connected in parallel
• CPC Class Codes: H02P 5/753 Differential gearing
• 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: Y02T 10/92 : Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

An integral element corresponding to a converter (CONV1) continues an integral operation even in a period (time tm1-tm2) in which a voltage converting operation of the converter (CONV1) is suspended. The integral output integrated in this period is invalid data. Therefore, if the invalid integral output is provided from the integral element at time tm2 at which the voltage converting operation of the converter (CONV1) is resumed, it follows that the converter would be controlled by an irrelevant control value. Therefore, as described above, the voltage converting operation control unit applies a reset signal to the integral element to zero-clear the stored integral output INT1.

Claims

1. A power supply system, having a plurality of rechargeable electric storage units, comprising:

a power line formed to allow transfer of electric power between a load device and said power supply system;

a plurality of voltage converting units provided between each of said plurality of electric storage units and said power line, each performing a voltage converting operation between the corresponding said electric storage unit and said power line, each of said plurality of voltage converting units executing said voltage converting operation in accordance with a control system including a history element outputting a control value determined dependent on history;

an operation mode selecting unit selecting, in response to a power request from said load device, an operation mode in which the voltage converting operation of at least one voltage converting unit included in said plurality of voltage converting units is suspended; and

a voltage converting operation control unit controlling execution and suspension of the voltage converting operation of each of said plurality of voltage converting units based on a status value of corresponding one of said electric storage units, when said operation mode is selected;

wherein

said voltage converting operation control unit sets, when said voltage converting operation is to be resumed at the suspended voltage converting unit, a prescribed initial value determined independent from said control value stored in corresponding said history element before resumption, to corresponding said history element.

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

said plurality of voltage converting units includes first and second voltage converting units;

and

said operation mode is a one-side suspended mode in which the voltage converting operation of one of said first and second voltage converting units is suspended and the voltage converting operation of the other is executed.

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

when the voltage converting unit for executing said voltage converting operation is to be switched from said first voltage converting unit to said second voltage converting unit, said voltage converting operation control unit sets, based on said control value stored in said history element corresponding to said first voltage converting unit, said prescribed initial value to said history element corresponding to said second voltage converting element, so that continuity of voltage converting operations by said first voltage converting unit and said second voltage converting unit is maintained before and after the switching.

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

said voltage converting operation control unit clears to zero said control value stored in said history element corresponding to the voltage converting unit that resumes the voltage converting operation.

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

said history element includes an integral element.

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

said history element includes a learning element that determines a learning value based on a status value of an object of control.

7. A vehicle, comprising:

a power supply system having a plurality of rechargeable electric storage units; and

a driving force generating unit receiving electric power supplied from said power supply system and generating driving force;

wherein

said power supply system includes;

a power line formed to allow transfer of electric power between a load device and said power supply system,

a plurality of voltage converting units provided between each of said plurality of electric storage units and said power line, each performing a voltage converting operation between the corresponding said electric storage unit and said power line, each of said plurality of voltage converting units executing said voltage converting operation in accordance with a control system including a history element outputting a control value determined dependent on history,

an operation mode selecting unit selecting, in response to a power request from said load device, an operation mode in which the voltage converting operation of at least one voltage converting unit included in said plurality of voltage converting units is suspended, and

a voltage converting operation control unit controlling execution and suspension of the voltage converting operation of each of said plurality of voltage converting units based on a status value of corresponding one of said electric storage units, when said operation mode is selected;

wherein

said voltage converting operation control unit sets, when said voltage converting operation is to be resumed at the suspended voltage converting unit, a prescribed initial value determined independent from said control value stored in corresponding said history element before resumption, to corresponding said history element.

8. The vehicle according to claim 7, wherein

said plurality of voltage converting units includes first and second voltage converting units;

and

said operation mode is a one-side suspended mode in which the voltage converting operation of one of said first and second voltage converting units is suspended and the voltage converting operation of the other is executed.

9. The vehicle according to claim 8, wherein

when the voltage converting unit for executing said voltage converting operation is to be switched from said first voltage converting unit to said second voltage converting unit, said voltage converting operation control unit sets, based on said control value stored in said history element corresponding to said first voltage converting unit, said prescribed initial value to said history element corresponding to said second voltage converting element, so that continuity of voltage converting operations by said first voltage converting unit and said second voltage converting unit is maintained before and after the switching.

10. The vehicle according to claim 7, wherein

said voltage converting operation control unit clears to zero said control value stored in said history element corresponding to the voltage converting unit that resumes the voltage converting operation.

11. A method of controlling a power supply system having a plurality of rechargeable electric storage units, wherein

said power supply system includes

a power line formed to allow transfer of electric power between a load device and said power supply system, and

a plurality of voltage converting units provided between each of said plurality of electric storage units and said power line, each performing a voltage converting operation between the corresponding said electric storage unit and said power line;

and

each of said plurality of voltage converting units executes said voltage converting operation in accordance with a control system including a history element outputting a control value determined dependent on history;

said control method comprising the steps of;

selecting an operation mode in which the voltage converting operation of at least one voltage converting unit included in said plurality of voltage converting units is suspended, in response to a power request from said load device; and

controlling execution and suspension of the voltage converting operation of each of said plurality of voltage converting units based on a status value of corresponding one of said electric storage units, when said operation mode is selected;

wherein

said controlling step includes the step of setting, when said voltage converting operation is to be resumed at the suspended voltage converting unit, a prescribed initial value determined independent from said control value stored in corresponding said history element before resumption, to corresponding said history element.

12. The control method according to claim 11, wherein

said plurality of voltage converting units includes first and second voltage converting units;

and

said operation mode is a one-side suspended mode in which the voltage converting operation of one of said first and second voltage converting units is suspended and the voltage converting operation of the other is executed.

13. The control method according to claim 12, wherein

said setting step includes the step of setting, when the voltage converting unit for executing said voltage converting operation is to be switched from said first voltage converting unit to said second voltage converting unit, based on said control value stored in said history element corresponding to said first voltage converting unit, said prescribed initial value to said history element corresponding to said second voltage converting element, so that continuity of voltage converting operations by said first voltage converting unit and said second voltage converting unit is maintained before and after the switching.

14. The control method according to claim 11, wherein

said setting step includes the step of clearing to zero said control value stored in said history element corresponding to the voltage converting unit that resumes the voltage converting operation.