CONTROL DEVICE FOR HYBRID VEHICLE, AND HYBRID VEHICLE INCORPORATING CONTROL DEVICE

• US 20130030634A1
• Filed: 04/07/2010
• Published: 01/31/2013
• Est. Priority Date: 04/07/2010
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Endo, Hiroki, Yamamoto, Masaya
• Granted Patent: US 9,493,150 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60K 6/46 Series type
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 50/10 using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• 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 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2710/06 Combustion engines, Gas turbines
• CPC Class Codes: B60W 2710/086 Power
• CPC Class Codes: B60W 50/082 Selecting or switching between different modes of propelling
• CPC Class Codes: B60Y 2200/92 Hybrid vehicles
• CPC Class Codes: B60Y 2300/182 Selecting between different operative modes, e.g. comfort and performance modes
• CPC Class Codes: B60Y 2300/43 Control of engines
• CPC Class Codes: B60Y 2300/60 Control of electric machines, e.g. problems related to electric motors or generators
• CPC Class Codes: B60Y 2300/91 Battery charging
• CPC Class Codes: F02N 11/0818 Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
• CPC Class Codes: Y02T 10/40 : Engine management systems
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y10S 903/93 : Conjoint control of different elements

Abstract

An ECU includes a running mode control unit, a Wout control unit, and an engine start/stop determination unit. The running mode control unit controls switching of a running mode including a CD mode in which an engine is stopped and running using a motor generator alone is given priority, and a CS mode in which the engine is operated and the SOC of a power storage device is maintained at a predetermined target. The engine start/stop determination unit carries out a start determination of the engine based on a discharge allowable power indicating electric power that can be discharged by the power storage device. The Wout control unit modifies the discharge allowable power based on the running mode and operation/stop of the engine.

Claims

1-11. -11. (canceled)

12. A control device for a hybrid vehicle,

said hybrid vehicle including

an internal combustion engine generating vehicle driving force,

a power storage device capable of being charged and discharged, and

an electric motor receiving supply of electric power from said power storage device for generating vehicle driving force,

said control device controlling switching of a running mode including a first mode in which said internal combustion engine is not operated to maintain a state of charge indicating a charging state of said power storage device, and a second mode in which said internal combustion engine is operated or stopped, and said internal combustion engine is operated to maintain said state of charge, and

said control device setting a startup power larger, when said running mode is at said first mode, than when said running mode is at said second mode, said startup power indicating a vehicle required power that causes said internal combustion engine to be started when said hybrid vehicle is running using said electric motor with said internal combustion engine stopped.

13. The control device for a hybrid vehicle according to claim 12, wherein said control device sets a stop power larger, when said running mode is at said first mode, than when said running mode is at said second mode, said stop power indicating a vehicle required power that causes said internal combustion engine to be stopped when said hybrid vehicle is running with said internal combustion engine operated.

14. The control device for a hybrid vehicle according to claim 13, wherein said stop power when said running mode is at said first mode is equal to said startup power when said running mode is at said first mode.

15. The control device for a hybrid vehicle according to claim 12, said hybrid vehicle further including a charging device configured to receive supply of electric power from a power supply external to the vehicle to charge said power storage device,

wherein said control device sets said running mode at said first mode after said power storage device is charged by said charging device.

30. A hybrid vehicle comprising a control device defined in claim 12.

16. A control device for a hybrid vehicle,

said hybrid vehicle including

an internal combustion engine generating vehicle driving force,

a power storage device capable of being charged and discharged, and

an electric motor receiving supply of electric power from said power storage device for generating vehicle driving force,

said control device setting a running mode at a first mode in which the hybrid vehicle runs without maintaining a state of charge indicating a charging state of said power storage device until said state of charge is reduced to a predetermined threshold value, and switching said running mode to a second mode in which the hybrid vehicle runs with said state of charge maintained when said state of charge reaches said predetermined threshold value, and

said control device setting a startup power larger, when said running mode is at said first mode, than when said running mode is at said second mode, said startup power indicating a vehicle required power that causes said internal combustion engine to be started when said hybrid vehicle is running using said electric motor with said internal combustion engine stopped.

17. A control device for a hybrid vehicle,

said hybrid vehicle including

an internal combustion engine generating vehicle driving force,

a power storage device capable of being charged and discharged, and

an electric motor receiving supply of electric power from said power storage device for generating vehicle driving force,

said control device controlling switching of a running mode including a first mode in which the hybrid vehicle runs with at least said electric motor as a driving force source and a state of charge indicating a charging state of said power storage device becoming lower in accordance with increase of a running distance, and a second mode in which said internal combustion engine is operated or stopped, the hybrid vehicle runs with at least one of said internal combustion engine and said electric motor as the driving force source, and said state of charge is maintained, and

said control device setting a startup power larger, when said running mode is at said first mode, than when said running mode is at said second mode, said startup power indicating a vehicle required power that causes said internal combustion engine to be started when said hybrid vehicle is running using said electric motor with said internal combustion engine stopped.

18. A control device for a hybrid vehicle,

said hybrid vehicle including

an internal combustion engine generating vehicle driving force,

a power storage device capable of being charged and discharged, and

an electric motor receiving supply of electric power from said power storage device for generating vehicle driving force,

said control device comprising:

a running mode control unit controlling switching of a running mode including a first mode in which said internal combustion engine is not operated to maintain a state of charge indicating a charging state of said power storage device, and a second mode in which said internal combustion engine is operated or stopped, and said internal combustion engine is operated to maintain said state of charge, and

a discharge allowable power control unit increasing, when said running mode is at said first mode and said internal combustion engine is stopped, a discharge allowable power that can be discharged by said power storage device than when the running mode is at said first mode and said internal combustion engine is operating, or than when said running mode is at said second mode.

19. The control device for a hybrid vehicle according to claim 18, further comprising a determination unit carrying out a start determination of said internal combustion engine based on said discharge allowable power.

20. The control device for a hybrid vehicle according to claim 19, wherein said determination unit carries out a stop determination of said internal combustion engine based on discharge allowable power increased by said discharge allowable power control unit, when said running mode is at said first mode and said internal combustion engine is operating.

21. The control device for a hybrid vehicle according to claim 18, said hybrid vehicle further including a charging device configured, to receive supply of electric power from a power supply external to the vehicle for charging said power storage device,

wherein said running mode control unit sets said running mode at said first mode after said power storage device is charged by said power storage device.

22. The control device for a hybrid vehicle according to claim 18, further comprising a rate processing unit modifying said discharge allowable power at a predetermined rate in modification of said discharge allowable power.

23. The control device for a hybrid vehicle according to claim 22, wherein said discharge allowable power control unit maintains said discharge allowable power when said internal combustion engine is started during modification of said discharge allowable power.

24. The control device for a hybrid vehicle according to claim 22, wherein said discharge allowable power control unit maintains said discharge allowable power when said internal combustion engine is started at a time of switching said running mode.

25. The control device for a hybrid vehicle according to claim 22, wherein a modifying rate of said discharge allowable power when said discharge allowable power returns from an increased state is smaller than the modifying rate of said discharge allowable power when said discharge allowable power is increased.

26. The control device for a hybrid vehicle according to claim 22, wherein a modifying rate of said discharge allowable power when said discharge allowable power is increased is greater than the modifying rate of said discharge allowable power when said discharge allowable power returns from an increased state.

27. The control device for a hybrid vehicle according to claim 18, further comprising a temporary-increase processing unit temporarily increasing said discharge allowable power when said internal combustion engine is started,

wherein said temporary-increase processing unit sets processing of temporarily increasing said discharge allowable power non-executable when said discharge allowable power has been increased by said discharge allowable power control unit.

31. A hybrid vehicle comprising a control device defined in claim 18.

28. A control device for a hybrid vehicle,

said hybrid vehicle including

an internal combustion engine generating vehicle driving force,

a power storage device capable of being charged and discharged, and

an electric motor receiving supply of electric power from said power storage device for generating vehicle driving force,

said control device comprising:

a running mode control unit setting a running mode at a first mode in which the hybrid vehicle runs without maintaining a state of charge indicating a charging state of said power storage device until said state of charge is reduced to a predetermined threshold value, and switching said running mode to a second mode in which the hybrid vehicle runs with said state of charge maintained when said state of charge reaches said predetermined threshold value, and

a discharge allowable power control unit increasing, when said running mode is at said first mode and said internal combustion engine is stopped, a discharge allowable power that can be discharged by said power storage device than when said running mode is at said first mode and said internal combustion engine is operating, or than when said running mode is at said second mode.

29. A control device for a hybrid vehicle,

said hybrid vehicle including

an internal combustion engine generating vehicle driving force,

a power storage device capable of being charged and discharged, and

an electric motor receiving supply of electric power from said power storage device for generating vehicle driving force,

said control device comprising:

a running mode control unit controlling switching of a running mode including a first mode in which the hybrid vehicle runs with at least said electric motor as a driving force source and a state of charge indicating a charging state of said power storage device becoming lower in accordance with increase of a running distance, and a second mode in which said internal combustion engine is operated or stopped, the hybrid vehicle runs with at least one of said internal combustion engine and said electric motor as the driving force source, and said state of charge is maintained, and

a discharge allowable power control unit increasing, when said running mode is at said first mode and said internal combustion engine is stopped, a discharge allowable power that can be discharged by said power storage device than when the running mode is at said first mode and said internal combustion engine is operating, or than when said running mode is at said second mode.