A method for controlling an engine clutch includes steps of controlling the hydraulic pressure transmitted from a master cylinder, driven by a motor, to a concentric slave cylinder using a controller outputting a motor control command for controlling an engine clutch so as to switch the engine clutch to a target state, driving the engine clutch using the concentric slave cylinder, after the step of controlling hydraulic pressure, detecting a position of a piston of the master cylinder using a first travel sensor and detecting a position of a piston of the concentric slave cylinder using a second travel sensor, and performing compensation control with respect to the motor based on the positions of the pistons detected by the first travel sensor and the second travel sensor using the controller so that the engine clutch is switched to the target state.

A method for operating a drive train by providing a primary drive machine, a working machine, a hydrodynamic clutch, and a temperature detection device; wherein at least in the case of a change from a load state and/or an operating state of the drive train thereby creating a new load state and a new operational state, the temperature of the hydrodynamic clutch is detected at the time of the change; wherein on the basis of the detected temperature and the new load state and/or the new operational state of the drive train, an expected temperature progression is calculated; and wherein a warning signal and/or a stop signal is issued for the primary drive machine if a temperature of the calculated temperature progression exceeds a predetermined maximum temperature within the expected duration of the new load state and/or the new operational state.

The present invention relates to a hydraulic-oil control device that performs hydraulic-oil supply control in a dual clutch device having a first clutch and a second clutch. The hydraulic-oil control device includes a first linear solenoid valve that adjusts hydraulic oil having a line pressure for a first hydraulic chamber and supplies the hydraulic oil thereto, a second linear solenoid valve that adjusts hydraulic oil having a line pressure for a second hydraulic chamber and supplies the hydraulic oil thereto, a shuttle valve that outputs the hydraulic oil having a higher pressure between the pressure of the hydraulic oil in the first hydraulic chamber and the pressure of the hydraulic oil in the second hydraulic chamber, and a switch valve that adjusts the amount of hydraulic oil supplied to a first space and a second space, according to the pressure of the hydraulic oil output from the shuttle valve.

A driver assistance device for a motor vehicle with a drive assembly, which can be connected to a drivetrain via a clutch that can be activated by an actuator. The clutch being a component of an electronically controlled clutch system, in which a clutch pedal sensor detects an actuation of a clutch pedal on the driver's side and in which an analysis unit determines, in a first control mode on the basis of the detected clutch pedal actuation, a clutch torque and actuates the clutch with a corresponding clutch signal. For an adjustment of the clutch response on the driver's side, the analysis unit is associated with an input unit, for the actuation of which, on the driver's side, it is possible to shift between the first control mode and at least one second control mode.

Operating a clutch assembly of a vehicle drive train, the clutch assembly comprising a clutch with a clutch component that exchanges heat at least indirectly with a medium which is conducted at least partially in the clutch, comprises at least: a) determining an operating point parameter which is representative of a current operating state of the clutch; b) determining a first thermal property parameter of the medium, as a function of the determined operating point parameter; c) determining a second thermal property parameter of the at least one clutch component; d) calculating a component temperature of the at least one clutch component as a function of at least the following three values: a further component temperature of a further clutch component, the first thermal property parameter, and the second thermal property parameter; and e) adapting activation of the clutch as a function of the calculated component temperature.

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 operating a drive train of a vehicle having a clutch assembly, in particular for distributing torque to a primary axle and a secondary axle of the vehicle and/or for distributing torque between two wheels of one axle of the vehicle, comprises at least the following steps: a) determining temperature data at least from an electronic control unit which is assigned to the clutch assembly, or from an actuation unit of the clutch assembly; b) evaluating the temperature data determined in step a); and c) reducing an effective value of a control current at least of the electronic control unit or of the actuation unit by pulsing the control current if the evaluation in step b) reveals that a temperature at least of the electronic control unit or of the actuation unit exceeds a threshold value.

To provide a device to facilitate protection of a clutch while minimizing degradation of the torque transmission performance. A hydraulic clutch for drive power distribution is provided between a drive power source and auxiliary driving wheels, and a commanded torque is determined depending on the travel situation. The hydraulic pressure corresponding to the commanded torque is supplied to the hydraulic clutch. The surface temperature of the clutch is estimated (detected). The device generates a limiting value to limit the commanded torque when the difference in rotation between input and output shafts of the clutch is not less than a predetermined threshold and the commanded torque is not less than a predetermined value and performs control so as to increase the limiting value with an increase in the surface temperature of the clutch.

Disclosed is a method for protecting a vehicle clutch, including a check step for checking the mileage of a vehicle and the number of times a clutch wear compensation device is operated; after the check step, a calculation step for calculating a clutch thermal severity level, which indicates the degree of thermal severity of the clutch, based on the mileage and the number of times the wear compensation device is operated; and a control step for controlling at least one of the shifting pattern of the vehicle and engine RPM depending on the clutch thermal severity level, after the calculation step.

According to one embodiment, a current detection circuit (12) includes: a detection resistor (Rs) provided between a solenoid valve (106) and a solenoid driver (11); an amplification unit (121) configured to amplify a detected voltage of the detection resistor (Rs); an AD converter (122) that is driven by a reference voltage (Vref) generated based on a reference current (Iref) and configured to convert an output voltage from the amplification unit (121) into a digital value and output the digital value as a detected current value (D1); and a correction unit configured to perform a correction on the detected current value (D1). The correction unit includes: a temperature sensor (123); a storage unit (125) configured to store information about temperature characteristics of the detected current value (D1) generated due to temperature characteristics of a reference current in each of two or more different temperature regions; and an operation unit configured to apply, to the detected current value (D1), a first correction coefficient calculated based on a detection result of the temperature sensor (123) and information about temperature characteristics of the detected current value (D1) stored in the storage unit (125).