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

• US 20170043762A1
• Filed: 09/28/2016
• Published: 02/16/2017
• 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 10,065,630 B2
• Time in Patent Office: Days
• 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. 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 stopped and running using said electric motor alone is given priority, and a second mode in which said internal combustion engine is operated and a state of charge indicating a charging state of said power storage device is maintained at a predetermined target,

a determination unit carrying out a start determination of said internal combustion engine based on a discharge allowable power indicating electric power that can be discharged by said power storage device, and

a discharge allowable power control unit modifying said discharge allowable power based on said running mode and operation/stop of said internal combustion engine.

2. The control device for a hybrid vehicle according to claim 1, wherein, when said running mode is at said first mode and said internal combustion engine is stopped, said discharge allowable power control unit increases said discharge allowable power 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.

3. The control device for a hybrid vehicle according to claim 2, 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 running mode control unit sets said running mode at said first mode after said power storage device is charged by said charging device.

4. The control device for a hybrid vehicle according to claim 2, wherein said determination unit carries out a stop determination of said internal combustion engine based on a 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.

5. The control device for a hybrid vehicle according to claim 2, further comprising a rate processing unit modifying said discharge allowable power at a predetermined rate in modification of said discharge allowable power.

6. The control device for a hybrid vehicle according to claim 5, 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.

7. The control device for a hybrid vehicle according to claim 5, 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.

8. The control device for a hybrid vehicle according to claim 5, 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.

9. The control device for a hybrid vehicle according to claim 5, 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.

10. The control device for a hybrid vehicle according to claim 2, 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.

11. A hybrid vehicle including a control device defined in claim 1.