Control system and control method for vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHideo Watanabe, Ryosuke Mizuto
Life of this patent
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Abstract
The disclosure is concerned with control system and control method, for a vehicle including a driving power source, drive wheels, a first clutch, and a second clutch. An electronic control unit, which is included in the control system, places the first clutch in a half-engaged state with a predetermined clutch torque capacity, when the vehicle is started, performs start control in a first mode using the second clutch, by gradually increasing a clutch torque capacity of the second clutch from a released state, and switches the start control from the first mode using the second clutch to a second mode using the first clutch, when the increased clutch torque capacity of the second clutch reaches the clutch torque capacity of the first clutch.
Claims10
A control system of a vehicle, the vehicle including
- a drive power source,
- drive wheels,
- a first clutch of an oil bath type comprising a wet clutch filled with oil for cooling, the first clutch being configured to selectively transmit and cut off power on a power transmission path through which torque is transmitted between the drive power source and the drive wheels, and
- a second clutch of a shaft-center oil feed type in which oil is suppled from a shaft center to friction plates, the second clutch being configured to selectively transmit and cut off power on the power transmission path, the control system comprising:
- an electronic control unit, the electronic control unit being configured to
- place the first clutch in a half-engaged state with a predetermined clutch torque capacity, when the vehicle is started,
- perform start control in a first mode using the second clutch, by gradually increasing a clutch torque capacity of the second clutch from a released state,
- switch the start control from the first mode using the second clutch to a second mode using the first clutch, when the increased clutch torque capacity of the second clutch reaches the clutch torque capacity of the first clutch, and
- transmit output torque of the drive power source to the drive wheels, to generate drive power for starting, based on operation of the first clutch and operation of the second clutch.
A control method for a vehicle, the vehicle including a drive power source, drive wheels, a first clutch of an oil bath type which comprises a wet clutch filled with oil for cooling, and is configured to selectively transmit and cut off power on a power transmission path through which torque is transmitted between the drive power source and the drive wheels, and a second clutch of a shaft-center oil feed type in which oil is suppled from a shaft center to friction plates, the second clutch being configured to selectively transmit and cut off power on the power transmission path, the control method comprising:
- placing the first clutch in a half-engaged state with a predetermined clutch torque capacity, when the vehicle is started,
- performing start control in a first mode using the second clutch, by gradually increasing a clutch torque capacity of the second clutch from a released state,
- switching the start control from the first mode using the second clutch to a second mode using the first clutch, when the increased clutch torque capacity of the second clutch reaches the clutch torque capacity of the first clutch, and
- transmitting output torque of the drive power source to the drive wheels, to generate drive power for starting, based on operation of the first clutch and operation of the second clutch.
Dependencies are inferred from the claim text.