An automatic transmission system of a vehicle and a corresponding adaptation method utilize an automatic transmission comprising a hydraulic friction clutch and a controller configured to continuously perform a feedforward adaptation procedure that models wear of the clutch, the feedforward adaptation procedure comprising obtaining a set of operating parameters each indicative of wear of the clutch, model the wear of the clutch based on the set of operating parameters using a clutch wear model, and determine a clutch offset for controlling application of the clutch based on the modeled clutch wear, and control application of the clutch based on the determined clutch offset.

A clutch torque estimating method for a transmission of a vehicle may include inputting model engine torque to a powertrain model by a controller; inputting target clutch torque of a first clutch and target clutch torque of a second clutch to the powertrain model by the controller; inputting shifting information related to the vehicle to the powertrain model by the controller; correcting the powertrain model in real time by feeding back an engine angular velocity error, a clutch angular velocity error of the first clutch, a clutch angular velocity error of the second clutch, a wheel angular velocity error to the powertrain model by the controller; and estimating clutch torque of the first clutch and clutch torque of the second clutch by determining the powertrain model by the controller.

A vehicle, in the drivetrain of which a clutch, in particular a wet-running multi-disc clutch, is connected as a starter element between an internal combustion engine and a transmission, having a clutch controller, which, as a function of current driving operation parameters, determines a setpoint clutch torque and actuates a clutch actuator with a manipulated variable correlating with the setpoint clutch torque, in order to set at the clutch an actual clutch torque, which manipulated variable is determined as a function of the setpoint clutch torque and of a coefficient of friction stored in the clutch controller in an actuation unit of the clutch controller, and having an engine controller, which determines an actual engine rotational speed and an actual engine torque, and, in a stationary state of the vehicle with the internal combustion engine running, regulates the actual engine rotational speed to a predefined idling rotational speed.

A clutch torque estimating method for a transmission of a vehicle may include inputting model engine torque to a powertrain model by a controller; inputting target clutch torque of a first clutch and target clutch torque of a second clutch to the powertrain model by the controller; inputting shifting information related to the vehicle to the powertrain model by the controller; correcting the powertrain model in real time by feeding back an engine angular velocity error, a clutch angular velocity error of the first clutch, a clutch angular velocity error of the second clutch, a wheel angular velocity error to the powertrain model by the controller; and estimating clutch torque of the first clutch and clutch torque of the second clutch by determining the powertrain model by the controller.

A vehicle control device includes: a unit that acquires a first transmission torque transmitted in a first state in which a control pressure is controlled to a first pressure value, and a second transmission torque transmitted in a second state in which the control pressure is controlled to a second pressure value; a control unit including a storage unit that stores control data including data indicating a relationship between a friction coefficient and a surface pressure. The control unit calculates a first friction coefficient based on the data and the first pressure value, calculates a second friction coefficient based on the data and the second pressure value, calculates an estimated value of the touch point pressure based on the first and second pressure values, the first and second transmission torques, the first and second friction coefficients to control data based on the estimated value.

A method for determining a service life of a friction clutch of a vehicle with a clutch actuation system includes setting a maximum torque at the friction clutch of the clutch actuation system. The method also includes incrementing a service life counter when an unintended slip at the friction clutch occurs, determining that wear has occurred on the friction clutch in response to reaching a specific counter value of the service life counter, and multiplying a weighted sensitivity factor by a first absolute vale which increments the counter in response to an unintended slip occurring.

A method of predicting the health of and controlling a hydraulic pressure actuated torque converter lock-up clutch includes determining rotational input and output speeds of the torque converter. The method also includes determining a magnitude of the hydraulic pressure. The method additionally includes determining a level of performance of the clutch across multiple torque converter operating modes using the determined input and output torque converter speeds and the determined magnitude of the hydraulic pressure. The method also includes calculating a numeric state of health (SOH) coefficient of the clutch that quantifies a relative severity of degradation of a plurality of clutch characteristics across the multiple torque converter operating modes. Furthermore, the method includes executing a control action relative to the clutch when the calculated numeric SOH coefficient for specified torque converter operating mode(s) is less than a calibrated SOH threshold.

A vehicle control device includes: a unit that acquires a first transmission torque transmitted in a first state in which a control pressure is controlled to a first pressure value, and a second transmission torque transmitted in a second state in which the control pressure is controlled to a second pressure value; a control unit including a storage unit that stores control data including data indicating a relationship between a friction coefficient and a surface pressure. The control unit calculates a first friction coefficient based on the data and the first pressure value, calculates a second friction coefficient based on the data and the second pressure value, calculates an estimated value of the touch point pressure based on the first and second pressure values, the first and second transmission torques, the first and second friction coefficients to control data based on the estimated value.

A vehicle propulsion system includes an engine including a crankshaft and adapted to generate torque, a crankshaft sensor that outputs a signal that is indicative of a rotary position of the crankshaft, a transmission with a clutch that is connected to the engine to receive the torque from the engine, a drive member connected to the transmission to receive torque from the transmission, and a controller that commands operation of the clutch based upon the signal from the crankshaft sensor for controlling engine compression pulse disturbances as the engine speed changes from an elevated rpm to low or zero rpm as well as low or zero rpm to an elevated rpm.

The invention relates to a method for adjusting a friction coefficient of an automated clutch, wherein a current friction coefficient (RK) is determined by a comparison with a moment of the internal combustion engine during a slipping phase of the clutch. In a method, in which the adaptation over the entire operation of the motor vehicle is possible, the current friction coefficient (RK) is pilot-controlled to a long-term friction coefficient (RL) in a non-slipping phase of the clutch and/or in the event of a torque signal that cannot be monitored.