A method and apparatus for determining the position of a clutch actuating piston

摘要

A method and apparatus for determining the position of a slave cylinder piston 62 connected to a clutch 2 is disclosed in which the position of the slave cylinder piston 62 is measured using a position sensor 63 and the actual displacement of the slave cylinder piston 62 is determined by subtracting a zero value Z from the measured position. The apparatus and method thereby compensates for variations in slave cylinder piston 62 zero position due to clutch wear. The method also compares a current measurement of slave cylinder position with a stored value position and sets the stored value of position to the measured value if the measured value is less than the stored value and retains the stored value if the measured value is greater than the stored value. The apparatus comprises a hydraulic clutch actuation system including a master cylinder 51 controlled by an electronic controller 16 and a mechanical linkage 65 connecting the slave cylinder piston 62 to the clutch 2.