A method to estimate an amount of force in a clutch pack of a clutch actuation system. The method includes engaging an actuation motor to apply a set point force to the clutch pack and monitoring a position of the actuation motor when the set point force is applied. Additionally, the method includes determining one or more clutch clamping curves and one or more clutch releasing curves based on a relationship between the position of the actuation motor and an amount of torque applied by the actuation motor at position of the actuation motor. The method further includes modeling one or more frictional characteristics of the clutch actuation system and estimating an amount of clamping and releasing force within the clutch pack by using a control unit. The amount of torque applied to the clutch pack between the clutch clamping and releasing curves at the set point force is maintained.

An automatic transmission system includes a housing containing automatic transmission fluid (ATF), a plurality of clutches configured to be engaged to generate gear ratios corresponding to forward speeds of the automatic transmission, wherein one clutch of the plurality of clutches is a friction clutch movable between a disengaged state, an engaged state utilized to create one or more gear ratios of the automatic transmission, and a slippingly engaged state between the disengaged state and the engaged state where the friction clutch is not engaged to create a gear ratio of the automatic transmission, and a controller configured to selectively move the friction clutch to the slippingly engaged state when the friction clutch is not being utilized to generate the one or more gear ratios, such that the friction clutch generates heat from friction to thereby rapidly heat the ATF in the housing and improve operating efficiency of the transmission.

An engine clutch control system of a hybrid vehicle includes a driving information detector for detecting vehicle information and road environment information according to operation of the hybrid vehicle. An engine clutch is disposed between an engine and a motor. A hybrid controller provides an EV (electric vehicle) mode or an HEV (hybrid electric vehicle) mode by controlling engagement or disengagement of the engine clutch. The hybrid controller sets a slip estimation region of the engine clutch from an accumulated value of an APS (Accelerator Pedal position Sensor), an engine clutch temperature, or a road inclination when engagement of the engine clutch is required, and extracts a speed variation of the engine and the motor in the slip estimation region. The hybrid controller compares the speed variation of the engine and the motor with each other, and determines the engine clutch is engaged when a maximal peak is detected.

A method for learning engine clutch delivery torque of a hybrid vehicle includes: determining, by a controller, whether power transference of a transmission transmitting output from an engine of the vehicle and a motor of the vehicle is interrupted; controlling, by the controller, a speed of the motor to be maintained at a first speed when the power transference of the transmission is interrupted; calculating, by the controller, a first delivery torque of an engine clutch that connects the engine with the motor or disconnects the engine from the motor, based on the first speed and a second speed of the motor which is generated after the engine clutch is engaged; controlling, by the controller, the speed of the motor to be maintained at the second speed by releasing the engine clutch after the first delivery torque is calculated; and calculating, by the controller, a second delivery torque of the engine clutch based on the second speed and a third speed of the motor which is generated after the engine clutch is engaged.

The present disclosure relates to a clutch control apparatus, and more particularly, to a clutch control apparatus that achieves miniaturization of machinery and reduces an operational error by using a non-contact type displacement detection system using a position detecting sensor for a clutch clearance, and regulates the operation of an actuator using a plurality of solenoid valves, as a result, allowing accurate position control of a pneumatic cylinder which operates the clutch, thereby improving fuel efficiency and achieving fuel reduction as well as reducing emissions of carbon dioxide.

A clutch control system includes a hunting determining unit that determines whether or not a hunting condition, under which hunting occurs in an engine rotational speed of an engine, is met, and a clutch position control unit. The clutch position control unit executes a first clutch position control, which is in accordance with engine rotation information, on the clutch if the hunting determining unit determines that the hunting condition is not met, and executes a second clutch position control, which is lower in response to the engine rotation information than the first clutch position control, on the clutch if the hunting determining unit determines that the hunting condition is met.

A method for learning engine clutch delivery torque of a hybrid vehicle includes: determining, by a controller, whether power transference of a transmission transmitting output from an engine of the vehicle and a motor of the vehicle is interrupted; controlling, by the controller, a speed of the motor to be maintained at a first speed when the power transference of the transmission is interrupted; calculating, by the controller, a first delivery torque of an engine clutch that connects the engine with the motor or disconnects the engine from the motor, based on the first speed and a second speed of the motor which is generated after the engine clutch is engaged; controlling, by the controller, the speed of the motor to be maintained at the second speed by releasing the engine clutch after the first delivery torque is calculated; and calculating, by the controller, a second delivery torque of the engine clutch based on the second speed and a third speed of the motor which is generated after the engine clutch is engaged.

A vehicle control system for a vehicle including an engine having a plurality of cylinders, a power transmission route between the engine and drive wheels and a clutch device for selectively connecting and disconnecting the power transmission route. The vehicle control system can disconnect the power transmission route during running to allow the vehicle to coast. The vehicle control system including an electronic control unit (ECU) for detecting, among other things, vehicle speed and operation of an accelerator by a driver, as well as for executing and controlling various components of the vehicle.

A control device of a vehicle includes an engine, an electric motor, and a first clutch connecting/disconnecting a power transmission path between the engine and the electric motor, and a second clutch configured to achieve a mechanically directly-coupled state of a power transmission path between the engine/the electric motor and drive wheels, the control device of a vehicle increasing a torque of the electric motor and causing the second clutch to slip-engage when the engine is started by controlling the first clutch toward engagement during motor running using only the electric motor as a drive force source for running with the first clutch released and the second clutch engaged, when the torque of the electric motor increased at the start of the engine relative to the torque of the electric motor during the motor running is larger, a slip amount of the second clutch being made larger as compared to when the torque is smaller.

A vehicle control system is provided. The vehicle control system is applied to a vehicle having a clutch device adapted to selectively connect and disconnect a power transmission route between a prime mover and drive wheels. The vehicle control system disconnects the power transmission route during running to allow the vehicle to coast. The vehicle control system is comprised of: a means detecting a vehicle speed; a means detecting an operation of an accelerator by a driver; a means detecting a braking operation of the driver; an execution means executing a coasting control when an operating amount of the accelerator is reduced to be smaller than a predetermined value during running, by bringing the clutch device into disengagement to disconnect the power transmission route so as to allow the vehicle to coast; a determination means determining whether or not a deceleration demand of the driver is larger than a predetermined value during execution of the coasting control based on the vehicle speed and the braking operation; and a termination means determining a fact that the deceleration demand is strong if the deceleration demand is larger than the predetermined value, and that terminates the coasting control by bringing the clutch device into engagement to connect the power transmission route.