Patent ID: 6109224
Filing Date: 2000-08-29
Classification: F01L,F02D,Y02T

Abstract:
A valve timing control apparatus for an internal combustion engine comprising a driving shaft, a driving force transmitting mechanism for transmitting a driving force from said driving shaft to a driven shaft for opening or closing at least one of intake and exhaust valves, said valve timing control apparatus comprising:a variable valve timing control device provided in said driving force transmitting mechanism for allowing a relative angular displacement between said driving shaft and said driven shaft within a predetermined angle;control rotational angle setting means for setting a control rotational angle required for optimizing said relative angular displacement in accordance with operating conditions of said internal combustion engine;relative angular displacement means for causing said variable valve timing control device to angularly dislocate at least one of said driving shaft and said driven shaft based on said control rotational angle;air-fuel ratio changing means for adjusting an air-fuel ratio in accordance with the operating conditions of said internal combustion engine; andair-fuel ratio correcting means for correcting said air-fuel ratio adjusted by said air-fuel ratio changing means in accordance with said control rotational angle set by said control rotational angle setting means.