Exhaust timing control valve control arrangement

摘要

An exhaust timing control valve control arrangement is disclosed. The exhaust valve is positioned in an exhaust port of an engine and movable between a retracted position in which the exhaust flow timing is advanced, and an extended position into the port in which the exhaust flow timing is retarded. A control is provided for moving the valve in a cleaning operation after the engine is started and running above a predetermined low speed. The cleaning operation may additionally be performed when the engine is shut off.