CONTROL SYSTEM FOR HYBRID VEHICLE

• US 20130261932A1
• Filed: 03/26/2013
• Published: 10/03/2013
• Est. Priority Date: 03/29/2012
• Status: Abandoned Application

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: OKAMOTO, Tsuyoshi
• Application Number:
  US13/850,743
• Publication Number:
  US 20130261932A1
• Time in Patent Office: Days
• US Class Current: 701/102
• CPC Class Codes: B60K 6/48 Parallel 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 20/16 for reducing engine exhaust emissions
• CPC Class Codes: B60W 2510/0676 Engine temperature
• CPC Class Codes: B60W 2510/246 Temperature
• CPC Class Codes: B60W 2540/06 Ignition switch
• CPC Class Codes: B60W 30/192 Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine
• CPC Class Codes: B60W 50/082 Selecting or switching between different modes of propelling
• CPC Class Codes: F02D 2200/604 Engine control mode selected by driver, e.g. to manually start particle filter regeneration or to select driving style
• CPC Class Codes: F02D 41/068 for warming-up
• CPC Class Codes: F02D 45/00 Electrical control not provided for in groups F02D41/00 - F02D43/00
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/84 Data processing systems or methods, management, administration

Abstract

A warm-up control unit determines that a fuel-consumption improving effect cannot be obtained or it is not necessary to facilitate a warm-up operation of an engine, when a manual switch, for example, an ECO-switch, is turned on, when an accelerator opening degree is smaller than a predetermined degree and a variation of the accelerator opening degree for a unit time is smaller than a predetermined variation value, or when an ambient temperature is lower than a predetermined temperature and there is no demand for a heating operation. Then, the warm-up control unit lowers a priority for preferentially carrying out the warm-up operation of the engine, so that an adverse effect for improving fuel consumption ratio which may be caused by facilitating the warm-up operation can be avoided.

Claims

1. In a control system for a hybrid vehicle, in which an engine and a motor-generator are mounted as a driving source for the hybrid vehicle and a warm-up control unit is provided for facilitating a warm-up operation of the engine when temperature of the engine is low,

the warm-up control unit changes a priority for preferentially carrying out the warm-up operation of the engine in accordance with a predetermined outside request.

2. The control system for the hybrid vehicle according to claim 1, wherein

the warm-up control unit monitors an operation of a warm-up control switch, which corresponds to the predetermined outside request;

and

the warm-up control unit raises or lowers the priority for preferentially carrying out the warm-up operation of the engine depending on the operation of the warm-up control switch.

3. The control system for the hybrid vehicle according to claim 1, wherein

the warm-up control unit monitors an accelerator opening degree, which corresponds to the predetermined outside request;

and

the warm-up control unit lowers the priority for preferentially carrying out the warm-up operation of the engine, when the accelerator opening degree is smaller than a predetermined opening degree and when a variation of the accelerator opening degree for a unit time is smaller than a predetermined variation value.

4. The control system for the hybrid vehicle according to claim 1, wherein

the warm-up control unit monitors a demand for a heating operation, which corresponds to the predetermined outside request;

and

the warm-up control unit lowers the priority for preferentially carrying out the warm-up operation of the engine, when ambient temperature is lower than a predetermined temperature but there exists no demand for the heating operation.

5. The control system for the hybrid vehicle according to claim 1, wherein

the warm-up control unit increases a burden ratio of the motor-generator, which corresponds to a ratio of driving force necessary for driving the vehicle and shouldered by the motor-generator, to a value higher than a predetermined ratio in a normal operation of the vehicle, when a remaining amount of a battery mounted in the vehicle is larger than a predetermined battery amount and temperature of the battery is higher than a predetermined battery temperature.

6. The control system for the hybrid vehicle according to claim 1, wherein

the warm-up control unit preferentially carries out the control for facilitating the warm-up operation of the engine, when a remaining amount of a battery mounted in the vehicle is smaller than a predetermined battery amount or when temperature of the battery is lower than a predetermined battery temperature.

7. In a control system for a hybrid vehicle, in which an engine and a motor-generator are mounted as a driving source for the hybrid vehicle and a warm-up control unit is provided for controlling a warm-up operation of the engine when temperature of the engine is low,

the warm-up control unit preferentially carries out the warm-up operation of the engine when following conditions are satisfied;

a warm-up control switch for canceling a preferential control of the warm-up operation of the engine is turned off;

an accelerator opening degree is larger than a predetermined degree or a variation of the accelerator opening degree for a unit time is larger than a predetermined variation value; and

an ambient temperature is higher than a predetermined temperature or there exists a demand for a heating operation by a heating device.

8. The control system for the hybrid vehicle according to claim 7, wherein

the warm-up control unit carries out the warm-up operation of the engine when a remaining amount of a battery mounted in the vehicle is smaller than a predetermined battery amount or when temperature of the battery is lower than a predetermined battery temperature.

9. The control system for the hybrid vehicle according to claim 7, wherein

the warm-up control unit increases a burden ratio of the motor-generator, which corresponds to a ratio of driving force necessary for driving the vehicle and shouldered by the motor-generator, to a value higher than a predetermined ratio in a normal operation of the vehicle, when a remaining amount of a battery mounted in the vehicle is larger than a predetermined battery amount and temperature of the battery is higher than a predetermined battery temperature.