Vehicle control system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKensei Hata, Yuji Iwase, Yosuke Suzuki, Koichi Kato, Seitaro Nobuyasu, Taro Moteki
Life of this patent
Estimating the term…
Abstract
A vehicle control system for preventing malfunction of the clutch for selectively connecting the engine with the power train. The vehicle control system is applied to a vehicle having an engine, a motor disposed on a power train, and a clutch interposed therebetween. In order to prevent a malfunction of the clutch, the vehicle control system is configured to engage the clutch while causing a slip but without starting the engine if the engine has not yet been started.
Claims9
A vehicle control system, which is applied to a vehicle comprised of an engine, a motor disposed on a power train, and a clutch for selectively connecting the engine with the power train that is adapted to cause a slip when engaged,
- wherein the vehicle control system is configured to engage the clutch while causing a slip but without starting the engine provided that the engine is not activated,
- wherein the vehicle control system is configured to estimate a friction coefficient of the clutch when increasing a rotational speed of the engine by a torque of the motor transmitted thereto through the clutch being engaged while causing a slip
- by estimating a torque transmitting capacity of the clutch being engaged while causing a slip based on:
- an output torque of the motor, and
- each change rate of rotational speed of the motor and rotational speed inputted to the clutch from the motor changed as a result of engaging the clutch while causing a slip, and
- by estimating the friction coefficient of the clutch based on the estimated value of the torque transmitting capacity of the clutch, and a control amount of the clutch to engage the clutch while causing a slip.
A vehicle control system for a vehicle, comprising
- an engine;
- a motor disposed on a power train;
- a clutch that selectively connects the engine with the power train, the clutch is adapted to cause a slip when engaged;
- and
- an electronic control unit that is operatively connected to the clutch and the engine, the electronic control unit configured to control the clutch to engage while causing a slip but without starting the engine provided that the engine is not activated,
- estimate a friction coefficient of the clutch when increasing a rotational speed of the engine by a torque of the motor transmitted thereto through the clutch being engaged while causing a slip,
- estimate a torque transmitting capacity of the clutch being engaged while causing a slip based on:
- an output torque of the motor, and each change rate of rotational speed of the motor and rotational speed inputted to the clutch from the motor changed as a result of engaging the clutch while causing a slip, and
- estimate the friction coefficient of the clutch based on the estimated value of the torque transmitting capacity of the clutch, and a control amount of the clutch to engage the clutch while causing a slip.
A vehicle control system, which is applied to a vehicle comprised of an engine, a motor disposed on a power train, and a clutch for selectively connecting the engine with the power train that is adapted to cause a slip when engaged,
- wherein the vehicle control system is configured to engage the clutch while causing a slip but without starting the engine provided that the engine is not activated,
- wherein the control system is configured to select an electric vehicle mode in which the vehicle is driven by a torque of the motor while disengaging the clutch in case a vehicle speed and a demanded driving force are smaller than predetermined threshold values, and
- wherein the control system is configured to lower a threshold value of the vehicle speed and a threshold value of the demanded driving force in case the friction coefficient of the clutch is equal to or smaller than the predetermined value thereby altering a border to shift a driving mode of the vehicle to the electric vehicle mode.
Dependencies are inferred from the claim text.