Patent ID: 6085706
Filing Date: 2000-07-11
Classification: F01L,F02B,F02D,Y02T

Abstract:
A valve timing control apparatus for an internal combustion engine, comprising:a variable valve timing control mechanism of a hydraulic type which is provided in a drive force transmission arrangement for transmitting a drive force from a driving shaft to a driven shaft for actuating one of an engine-cylinder inlet valve and an engine-cylinder outlet valve, and which can relatively rotate one of the driving shaft and the driven shaft in a predetermined angular range;detecting means for detecting a condition in which air enters hydraulic working fluid in the variable valve timing control mechanism;trouble diagnosis means for implementing a trouble diagnosis on the variable valve timing control mechanism; andinhibiting means for inhibiting the trouble diagnosis implemented by the trouble diagnosis means when the detecting means detects the condition in which air enters hydraulic working fluid in the variable valve timing control mechanism.