Variable valve unit's reference position acquisition device for vehicle, has control device acquiring signals of angle sensor in condition of reduced torque as signals at reference position, at which shaft rotation is limited by stopper

摘要

The device has variable valve lifting and timing mechanisms (112, 113) which change opening characteristics of an engine valve (105) by rotation of a control shaft produced by a motor. An angle sensor (133) outputs signals according to an angle position of the shaft. A motor control device (114) reduces drive torque of the motor by controlling the motor such that the shaft is actuated against the stopper. The device (114) acquires the signals of the sensor in a condition of the reduced torque as signals at a reference position, at which the shaft rotation is limited by a stopper. An independent claim is also included for a method for acquisition of a reference position of a variable valve unit.