A clutch control device includes an engine, a gearbox, a clutch device configured to disconnect and connect power transmission between the engine and the gearbox, a clutch actuator configured to drive the clutch device and vary a clutch capacity, an engine rotational number sensor configured to detect an engine rotational number, a throttle opening angle sensor configured to detect a throttle opening angle, and a controller configured to calculate a control target value of the clutch capacity, wherein the controller calculates an estimated engine torque and causes the clutch device to change a slip clutch capacity according to the estimated engine torque.

A control system for a vehicle configured to accurately learn an initial engagement position of a clutch. The control system is applied to a vehicle comprising a clutch that selectively transmits power between a prime mover and drive wheels, and a detector that detects an input speed of the clutch rotated by the prime mover. A controller executes a learning of the initial engagement position of the clutch, if a reaction time until an input speed of the clutch is changed by engaging the clutch gradually while maintaining the input speed of the clutch to a constant speed is shorter than a threshold period of time.

A method for controlling a pneumatic actuator (1) of a transmission having at least one sealing element (6, 7), arranged between two elements (2, 3) of the clutch actuator (1) that move relative to one another, and within a specifiable operating temperature range in which leakproofness of the clutch actuator (1) is ensured. The clutch actuator (1) is acted upon with compressed air from an air supply system for actuating a shifting and/or starting clutch arranged between a drive aggregate and a transmission. In order to warm up the clutch actuator (1), if a temperature of the clutch actuator (1) is lower then a glass transition temperature of the at least one sealing element (6, 7), the drive aggregate is operated at a higher rotational speed compared to the idling speed of the drive aggregate.

A clutch control device includes an engine, a gearbox, a clutch device configured to disconnect and connect power transmission between the engine and the gearbox, a clutch actuator configured to drive the clutch device and vary a clutch capacity, an engine rotational number sensor configured to detect an engine rotational number, a throttle opening angle sensor configured to detect a throttle opening angle, and a controller configured to calculate a control target value of the clutch capacity, wherein the controller calculates an estimated engine torque and causes the clutch device to change a slip clutch capacity according to the estimated engine torque.

A method for synchronizing a first drive element rotatable about an axis of rotation with a second drive element rotating about the axis of rotation at a target speed, of a powertrain of a motor vehicle, in which a synchronizing force is exerted on a synchronizing unit by an actuator. A speed, at which the first drive element rotates about the axis of rotation is adapted by the synchronizing unit to the target speed. The synchronizing force is increased during a first time span, so that the speed approaches the target speed. The synchronizing force is continuously reduced during a second time span following the first time span, before the speed corresponds to the target speed.

A method for controlling a pneumatic actuator (1) of a transmission having at least one sealing element (6, 7), arranged between two elements (2, 3) of the clutch actuator (1) that move relative to one another, and within a specifiable operating temperature range in which leakproofness of the clutch actuator (1) is ensured. The clutch actuator (1) is acted upon with compressed air from an air supply system for actuating a shifting and/or starting clutch arranged between a drive aggregate and a transmission. In order to warm up the clutch actuator (1), if a temperature of the clutch actuator (1) is lower then a glass transition temperature of the at least one sealing dement (6, 7), the drive aggregate is operated at a higher rotational speed compared to the idling speed of the drive aggregate.

A powertrain of a vehicle can be operated. The powertrain can have at least one transmission housing, a clutch assembly which is arranged therein and which comprises a clutch that operates in a positively locking manner, and an actuation unit for actuating the clutch. The clutch comprises at least one first clutch component, which can be moved along an axial direction, and a second clutch component, said clutch components being connected together in a form-fitting manner upon actuating the clutch; wherein the actuation unit comprises an electromagnetic actuator with a piston, and the piston is moved from a starting position into an end position along the axial direction upon actuating the clutch, thereby moving the first clutch component.

An electronic clutch actuator for actuation of a clutch in a transmission of a vehicle includes a clutch master cylinder having a fluid cavity therein and adapted to be in fluid communication with a clutch slave cylinder coupled to the clutch of the transmission, a movable piston disposed in the fluid cavity of the clutch master cylinder, a rotatable screw having one end coupled to the piston to translate the piston, a geartrain disposed perpendicular to the rotatable screw to rotate the rotatable screw, and a motor having an output shaft disposed perpendicular to the geartrain to form a U-shaped arrangement to rotate gears of the geartrain.

A selectable one-way clutch includes an engagement mechanism. The engagement mechanism is configured to be switched between an engaged state and a disengaged state. The engaged state is a state in which relative rotation between a first and a second members in one of a positive rotational direction and a reverse rotational direction is restricted. The disengaged state is a state in which the relative rotation between the first member and the second member in both of the positive and the reverse rotational direction is permitted. The electronic control unit is configured to apply torque to the one of the first member or the second member by using a motor such that relative rotation in the other one of the positive or the reverse rotational direction is generated between the first member and the second member when the engagement mechanism is switched from the engaged state to the disengaged state.

Disclosed are dry clutch control method and apparatus for a vehicle. The method may include a reference speed generating step of generating a virtual target input shaft speed from a wheel speed, a vibration recognizing step of detecting a vibration component based on a difference between an actually measured input shaft speed and the virtual target input shaft speed, and a control input step of additionally applying an anti judder control input to a clutch control torque controlling a dry clutch connected to an input shaft. The anti judder control input may be applied to the vibration component recognized in the vibration recognizing step in a form of being continuously damped starting from an impulsive control input.