Actuating drive with valve units for actuating a friction clutch and an automated shift transmission

An actuating device for automated actuation of a friction clutch, comprising:

• actuator means for automated engagement and disengagement of the friction clutch;
• control means, to which signals characterizing an operating state are fed, for controlling the actuator means for the engagement and disengagement of the friction clutch as a function of the signals;
• and
• a sensor system which picks up signals characterizing a gradient of a transmission input shaft speed, the control means receiving signals from the sensor system, whereby starting from a position in which the friction clutch is at least partly disengaged by the actuator means, an engagement rate of the friction clutch by means of the actuator means is predeterminable as a function of the gradient of the transmission input shaft speed, the actuating means including actuating cylinders, the sensor system including sensors arranged at the actuating cylinders for ascertaining the position of the actuating cylinders, the control means being operative to detect a deviation of an actual position from a desired position based on the signals from said sensors.

An actuating device for automated actuation of a friction clutch, comprising:

• actuator means for automated engagement and disengagement of the friction clutch;
• control means, to which signals characterizing an operating state are fed, for controlling the actuator means for the engagement and disengagement of the friction clutch as a function of the signals;
• and
• a sensor system which picks up signals characterizing a gradient of a transmission input shaft speed, the control means receiving signals from the sensor system, whereby starting from a position in which the friction clutch is at least partly disengaged by the actuator means, an engagement rate of the friction clutch by means of the actuator means is predeterminable as a function of the gradient of the transmission input shaft speed, the actuator means for actuating the friction clutch includes a hydraulic circuit with an actuating cylinder to which further actuating cylinders are connected for automated actuation of a shift transmission, valve units being connected to the actuating cylinders so as to enable a switching operation between the friction clutch and the shift transmission, the valve unit assigned to the friction clutch having switching means, which is linked between one of the actuating cylinders for slot selection and a hydraulic circuit that is connected to another of the actuating cylinders, for actuating the friction clutch and selectively enabling driving of one of the actuating cylinders.