Control system for hybrid vehicle

• US 9,908,524 B2
• Filed: 08/31/2016
• Issued: 03/06/2018
• Est. Priority Date: 09/08/2015
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Asami, Yoshikazu, Ando, Daigo, Nawata, Hidekazu
• Primary Examiner(s): To, Tuan C
• Application Number:
  US15/252,762
• Publication Number:
  US 20170066438A1
• Time in Patent Office: 552 Days
• CPC Class Codes: B60K 6/20 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60K 6/46 Series type
• 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 20/50 Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode
• CPC Class Codes: B60W 2050/0006 Digital architecture hierarchy
• CPC Class Codes: B60W 2530/00 Input parameters relating to vehicle conditions or values, not covered by groups B60W2510/00 or B60W2520/00
• CPC Class Codes: B60W 2710/06 Combustion engines, Gas turbines
• CPC Class Codes: B60W 2710/0644 Engine speed
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/0677 Engine power
• CPC Class Codes: B60W 2710/08 Electric propulsion units
• CPC Class Codes: B60W 50/038 Limiting the input power, torque or speed
• CPC Class Codes: B60Y 2200/92 Hybrid vehicles
• CPC Class Codes: B60Y 2300/26 Dangerous conditions
• 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: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y10S 903/93 Conjoint control of different elements

Abstract

A control system may include a first electronic control unit programmed to control the engine and a second electronic control unit programmed to control the rotary electric machine. The second electronic control unit may be programmed to output an engine command signal to the first electronic control unit through communication with the first electronic control unit. The first electronic control unit may be programmed to control the engine in accordance with the engine command signal received from the second electronic control unit, when a communication abnormality with the second electronic control unit does not occur; and to execute fixing operation control in which the engine is controlled such that at least one of speed, output power, and output torque of the engine becomes a corresponding fixed value, when the communication abnormality with the second electronic control unit occurs.

Claims

1. A control system for a hybrid vehicle, the hybrid vehicle being configured to travel by using power of at least one of an engine and a rotary electric machine, the hybrid vehicle being configured to be able to output request drive power requested by a user,

the control system comprising:

a first electronic control unit being programmed to control the engine; and

a second electronic control unit being programmed to control the rotary electric machine, the second electronic control unit being programmed to output an engine command signal to the first electronic control unit through communication with the first electronic control unit, and

the first electronic control unit being programmed to;

a) control the engine in accordance with the engine command signal received from the second electronic control unit, when a communication abnormality with the second electronic control unit does not occur; and

b) execute fixing operation control in which the engine is controlled such that at least one of speed, output power, and output torque of the engine becomes a corresponding fixed value, when the communication abnormality with the second electronic control unit occurs.

2. The control system according to claim 1, wherein

the second electronic control unit is programmed to control the rotary electric machine so as to transmit the requested drive power to a drive wheel under a precondition that the engine is operated in accordance with the engine command signal, when a communication abnormality with the first electronic control unit does not occur, and

the second electronic control unit is programmed to control the rotary electronic machine so as to transmit the requested drive power to the drive wheel under a precondition that the engine is operated by the fixing operation control, when the communication abnormality with the first electronic control unit occurs.

3. The control system according to claim 1, wherein

the first electronic control unit is programmed to stop the engine without executing the fixing operation control in case where the communication abnormality with the second electronic control unit occurs and at least one of the speed, the output power, and the output torque of the engine deviates from the corresponding fixed value by a specified value or larger.

4. The control system according to claim 1, wherein

the engine is mechanically coupled to the rotary electric machine,

the first electronic control unit is programmed to output a stop request to stop the engine without executing the fixing operation control, when the communication abnormality with the second electronic control unit occurs and the speed of the engine deviates from a fixed value by a specified value or larger, and

the second electronic control unit is programmed to control the rotary electric machine such that the speed of the engine deviates from the fixed value by the specified value or larger, when a communication abnormality with the first electronic control unit occurs and the stop request is present.