Onboard battery control device and control method

• US 20060241826A1
• Filed: 04/28/2004
• Published: 10/26/2006
• Est. Priority Date: 06/03/2003
• Status: Abandoned Application

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ishishita, Teruo, Takahashi, Hidenori
• Application Number:
  US10/555,992
• Publication Number:
  US 20060241826A1
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60L 2240/445 Temperature
• CPC Class Codes: B60L 58/10 for monitoring or controlling batteries
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 2510/068 Engine exhaust temperature
• CPC Class Codes: F02D 2041/026 using an external load, e.g. by increasing generator load or by changing the gear ratio
• CPC Class Codes: F02D 41/0245 by increasing temperature of the exhaust gas leaving the engine
• CPC Class Codes: F02D 41/10 for acceleration
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• 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

Abstract

A hybrid ECU sets a charge power limit value W (IN) and a discharge power limit value W (OUT) that are respective limits of electric power to charge a battery and electric power to be discharged therefrom. The charge power limit value W (IN) and the discharge power limit value W (OUT) are set in such a manner that, in a case where warm-up of a catalyst is necessary, charging and discharging of the battery is permitted even if the battery temperature TB is higher as compared with that in a case where warm-up of the catalyst is unnecessary. Thus, if warm-up of the catalyst is necessary, the limitation on the charge/discharge electric power are relaxed with respect to the battery temperature so as to increase the chargeable/dischargeable temperature region for the battery. In this way, a motor generator can be driven while the battery temperature is high.

Claims

1. A control device for a battery mounted on a vehicle having an engine generating a driving force by combustion of fuel, a catalyst purifying exhaust gas generated by the combustion, an electric motor generating a driving force, and the battery supplying electric power to said electric motor, said vehicle running by at least one of respective driving forces from said engine (and said electric motor, said control device comprising:

acceleration request detection means for detecting an acceleration request of said vehicle;

determination means for determining whether or not warm-up for increasing the temperature of said catalyst is necessary; and

control means for controlling, in a case where said determination means determines that said warm-up is necessary and said acceleration request is detected, charge/discharge electric power of said battery to drive said vehicle by said electric motor.

2. The control device for the battery mounted on the vehicle according to claim 1, wherein

said control means includes

limitation means for limiting the charge/discharge electric power of said battery, and

relaxation means for relaxing, if said determination means determines that said warm-up is necessary, limitation on said charge/discharge electric power as compared with limitation on said charge/discharge electric power in a case where said warm-up is unnecessary.

3. The control device for the battery mounted on the vehicle according to claim 2, further comprising temperature detection means for detecting the temperature of said battery, wherein

said limitation means includes means for limiting said charge/discharge electric power based on the detected temperature.

4. The control device for the battery mounted on the vehicle according to claim 3, wherein

said relaxation means includes means for relaxing the limitation on said charge/discharge electric power based on the battery temperature if it is determined that said warm-up is necessary.

5. The control device for the battery mounted on the vehicle according to claim 2, wherein

said relaxation means includes means for relaxing the limitation on said charge/discharge electric power based on the battery temperature if it is determined that said warm-up is necessary.

6. The control device for the battery mounted on the vehicle according to claim 2, further comprising increment detection means for detecting an increment in temperature of said battery, wherein

said limitation means includes means for limiting said charge/discharge electric power based on the detected increment.

7. A control device for a battery mounted on a vehicle having an engine generating a driving force by combustion of fuel, a catalyst purifying exhaust gas generated by the combustion, an electric motor generating a driving force, and the battery supplying electric power to said electric motor, said vehicle running by at least one of respective driving forces from said engine and said electric motor, said control device comprising:

an acceleration request detection unit for detecting an acceleration request of said vehicle;

a determination unit for determining whether or not warm-up for increasing the temperature of said catalyst is necessary; and

a control unit for controlling, in a case where said determination unit determines that said warm-up is necessary and said acceleration request is detected, charge/discharge electric power of said battery to drive said vehicle by said electric motor.

8. The control device for the battery mounted on the vehicle according to claim 7, wherein

said control unit includes

a limitation unit for limiting the charge/discharge electric power of said battery, and

a relaxation unit for relaxing, if said determination unit determines that said warm-up is necessary, limitation on said charge/discharge electric power as compared with limitation on said charge/discharge electric power in a case where said warm-up is unnecessary.

9. The control device for the battery mounted on the vehicle according to claim 8, further comprising a temperature detection unit for detecting the temperature of said battery, wherein

said limitation unit limits said charge/discharge electric power based on the detected temperature.

10. The control device for the battery mounted on the vehicle according to claim 9, wherein

said relaxation unit relaxes the limitation on said charge/discharge electric power based on the battery temperature if it is determined that said warm-up is necessary.

11. The control device for the battery mounted on the vehicle according to claim 8, wherein

said relaxation unit relaxes the limitation on said charge/discharge electric power based on the battery temperature if it is determined that said warm-up is necessary.

12. The control device for the battery mounted on the vehicle according to claim 8, further comprising an increment detection unit for detecting an increment in temperature of said battery, wherein

said limitation unit limits said charge/discharge electric power based on the detected increment.

13. A control method for a battery mounted on a vehicle having an engine generating a driving force by combustion of fuel, a catalyst purifying exhaust gas generated by the combustion, an electric motor generating a driving force, and the battery supplying electric power to said electric motor, said vehicle running by at least one of respective driving forces from said engine and said electric motor, said battery control method comprising the steps of:

detecting an acceleration request of said vehicle;

determining whether or not warm-up for increasing the temperature of said catalyst is necessary; and

controlling, in a case where it is determined that said warm-up is necessary and said acceleration request is detected, charge/discharge electric power of said battery to drive said vehicle by said electric motor.

14. The control method for the battery mounted on the vehicle according to claim 13, wherein

said step of controlling charge/discharge electric power includes the steps of

limiting the charge/discharge electric power of said battery, and

relaxing, if it is determined that said warm-up is necessary in said step of determining whether or not warm-up is necessary, limitation on said charge/discharge electric power as compared with limitation on said charge/discharge electric power in a case where said warm-up is unnecessary.

15. The control method for the battery mounted on the vehicle according to claim 14, further comprising the step of detecting the temperature of said battery, wherein

said step of limiting the charge/discharge electric power includes the step of limiting said charge/discharge electric power based on the detected temperature.

16. The control method for the battery mounted on the vehicle according to claim 15, wherein

said step of relaxing limitation includes the step of relaxing the limitation on said charge/discharge electric power based on the battery temperature if it is determined that said warm-up is necessary.

17. The control method for the battery mounted on the vehicle according to claim 14, wherein

said step of relaxing limitation includes the step of relaxing the limitation on said charge/discharge electric power based on the battery temperature if it is determined that said warm-up is necessary.

18. The control method for the battery mounted on the vehicle according to claim 14, further comprising the step of detecting an increment in temperature of said battery, wherein

said step of limiting said charge/discharge electric power includes the step of limiting said charge/discharge electric power based on the detected increment.