Kraftfahrzeug-Überbrückungskupplungssteuerung mit Einrichtungen zur hochgenauen Erfassung von Kupplungsrupfen

摘要

An apparatus for controlling a lock-up clutch (32) between pump and turbine impellers (18, 22) in a power transmitting system of a motor vehicle, including a slip control device (196) for controlling the amount of slip of the lock-up clutch, and a judder detector (208) for detecting a judder of the lock-up clutch based on the number of detected speed variations of the turbine impeller during slip control of the lock-up clutch by said slip control means, wherein the judder detector is inhibited from using a variation of the turbine impeller speed variation for the detection of the judder, if the amount of change of the variation amplitude is larger than a predetermined threshold or if the period of the variation is outside a predetermined range. The judder detector (228) is preferably arranged to operate on the basis of the variation amplitude of the turbine impeller speed as compared with the variation amplitude of the output speed of an automatic transmission multiplied by the actual speed ratio of the transmission, or on the basis of a phase difference between the variation waveforms of the turbine impeller and transmission output speeds.