METHOD FOR DETECTING CLUTCH CYLINDER LEAKAGE

摘要

A method for sensing leakage in a clutch cylinder (110) system in a vehicle comprising an automated manual transmission, wherein the clutch cylinder system comprises a clutch cylinder (110) provided with a reciprocable piston (115), whose position is sensed by a position sensor (140) and affected by pressurization of said cylinder (110) by opening or closing at least one air inlet valve (Vl, V2) and by opening or closing at least one air outlet valve (V3, V4) and wherein the clutch is in an engaged position when there is no air pressure in said cylinder is characterized by the steps of : a. closing said at least one inlet valve (Vl;V2) and at least one outlet valve (V3; V4) for compressed air; b. sensing a position of said piston (115) during a predetermined time span, and, c. if the position has changed more than a predetermined allowable position change, sending an error signal to an onboard diagnostics system or a signal light in the vehicle.