Vehicle, controller for vehicle, and control method for vehicle

A vehicle comprising:

• an engine;
• a drive wheel;
• a clutch configured to connect and disconnect a power transmission route between the engine and the drive wheel;
• a clutch actuator configured to switch between engagement and disengagement of the clutch;
• and
• an electronic control unit configured to:
• switch an actuation state of the clutch by the clutch actuator;
• determine whether fluctuations in torsional torque generated in the power transmission route between the clutch and the drive wheel are larger than a specified value;
• and
• control the clutch so as to increase torque capacity of the clutch when the electronic control unit determines that the fluctuations in the torsional torque are larger than the specified value during deceleration traveling of the vehicle,
• wherein the electronic control unit is further configured to:
• compute an increased torque capacity of the clutch that is required to suppress the fluctuations in the torsional torque;
• switch the actuation state of the clutch by the clutch actuator such that a driver requested torque capacity is obtained, the driver requested torque capacity being based on an operation of a clutch pedal by a driver of the vehicle;
• and
• control the clutch so as to increase the torque capacity by the smaller of (1) the increased torque capacity and (2) a differential torque capacity which is a difference between a maximum torque capacity of the clutch and the driver requested torque capacity.

A controller for a vehicle, the vehicle including

• an engine,
• a drive wheel,
• a clutch configured to connect and disconnect a power transmission route between the engine and the drive wheel,
• a clutch actuator configured to switch between engagement and disengagement of the clutch, and
• a transmission provided in the power transmission route between the clutch and the drive wheel,
• the controller comprising
• an electronic control unit configured to:
• switch an actuation state of the clutch by the clutch actuator;
• determine whether fluctuations in torsional torque generated in the power transmission route between the clutch and the drive wheel are larger than a specified value;
• and
• control the clutch so as to increase torque capacity of the clutch when the electronic control unit determines that the fluctuations in the torsional torque are larger than the specified value during deceleration traveling of the vehicle, wherein
• the electronic control unit is configured to determine whether the fluctuations in the torsional torque are larger than the specified value, based on a magnitude of fluctuation width of an input rotational speed of the transmission in a specified period, and
• the electronic control unit is configured to determine that the fluctuations in the torsional torque are larger than the specified value when a value of an integral of a speed difference between a speed of the engine and the input rotational speed of the transmission in the specified period is equal to or larger than a predetermined first determination value.

A controller for a vehicle, the vehicle including

• an engine,
• a drive wheel,
• a clutch configured to connect and disconnect a power transmission route between the engine and the drive wheel,
• a clutch actuator configured to switch between engagement and disengagement of the clutch, and
• a transmission provided in the power transmission route between the clutch and the drive wheel,
• the controller comprising
• an electronic control unit configured to:
• switch an actuation state of the clutch by the clutch actuator;
• determine whether fluctuations in torsional torque generated in the power transmission route between the clutch and the drive wheel are larger than a specified value;
• and
• control the clutch so as to increase torque capacity of the clutch when the electronic control unit determines that the fluctuations in the torsional torque are larger than the specified value during deceleration traveling of the vehicle, wherein
• the electronic control unit is further configured to:
• compute an increased torque capacity of the clutch that is required to suppress the fluctuations in the torsional torque;
• switch the actuation state of the clutch by the clutch actuator such that a driver requested torque capacity is obtained, the driver requested torque capacity being based on an operation of a clutch pedal by a driver of the vehicle;
• and
• control the clutch so as to increase the torque capacity by the smaller of (1) the increased torque capacity and (2) a differential torque capacity which is a difference between a maximum torque capacity of the clutch and the driver requested torque capacity.

A control method for a vehicle, the vehicle including

• an engine,
• a drive wheel,
• a clutch configured to connect and disconnect a power transmission route between the engine and the drive wheel,
• a clutch actuator configured to switch between engagement and disengagement of the clutch, and
• an electronic control unit configured to switch an actuation state of the clutch by the clutch actuator,
• the control method comprising:
• determining, by the electronic control unit, whether fluctuations in torsional torque generated in the power transmission route between the clutch and the drive wheel are larger than a specified value;
• and
• controlling the clutch by the electronic control unit so as to increase torque capacity of the clutch when the electronic control unit determines that the fluctuations in the torsional torque are larger than the specified value during deceleration traveling of the vehicle, wherein
• the electronic control unit determines whether the fluctuations in the torsional torque are larger than the specified value, based on a magnitude of fluctuation width of an input rotational speed of a transmission in a specified period, the transmission is provided in the power transmission route between the clutch and the drive wheel, and
• the electronic control unit determines that the fluctuations in the torsional torque are larger than the specified value when a value of an integral of a speed difference between a speed of the engine and the input rotational speed of the transmission in the specified period is equal to or larger than a predetermined first determination value.

A control method for a vehicle, the vehicle including

• an engine,
• a drive wheel,
• a clutch configured to connect and disconnect a power transmission route between the engine and the drive wheel,
• a clutch actuator configured to switch between engagement and disengagement of the clutch, and
• an electronic control unit configured to switch an actuation state of the clutch by the clutch actuator,
• the control method comprising:
• determining, by the electronic control unit, whether fluctuations in torsional torque generated in the power transmission route between the clutch and the drive wheel are larger than a specified value;
• and
• controlling the clutch by the electronic control unit so as to increase torque capacity of the clutch when the electronic control unit determines that the fluctuations in the torsional torque are larger than the specified value during deceleration traveling of the vehicle, wherein
• an increased torque capacity of the clutch is computed by the electronic control unit, the increased torque capacity being required to suppress the fluctuations in the torsional torque, and
• the control method further comprises:
• switching the actuation state of the clutch by the clutch actuator with the electronic control unit such that a driver requested torque capacity is obtained, the driver requested torque capacity being based on an operation of a clutch pedal by a driver of the vehicle;
• and
• controlling the clutch by the electronic control unit so as to increase the torque capacity by the smaller of (1) the increased torque capacity and (2) a differential torque capacity which is a difference between a maximum torque capacity of the clutch and the driver requested torque capacity.