Patent ID: 6634329
Filing Date: 2003-10-21
Classification: F01L,F02D

Abstract:
An apparatus for controlling a valve timing of an engine, comprising:a variable valve timing actuator having a hydraulic actuator which rotates a camshaft in an advance or retard direction relative to a crankshaft; means for advancing the valve timing to at least a middle position when the engine is stopped; and means for preparing the advancing control of the advancing means before the engine is stopped, the means controlling the engine into a condition that helps to advance the valve timing by the advancing means; wherein the advancing means has at least one of an assist spring which assist to rotate the camshaft in the advance direction, and means for controlling the hydraulic actuator to rotate the camshaft in the advance direction when the engine is stopped; the preparing means comprises at least one of means for increasing an engine speed when the engine is in an idling and a temperature of an oil supplied to the hydraulic actuator is high, pre-advancing means for advancing the valve timing previously when the engine is in an idling and a temperature of an oil supplied to the hydraulic actuator is high, and means for decreasing a temperature of an oil supplied to the hydraulic actuator when the temperature of oil is high.