Patent ID: 7063056
Filing Date: 2006-06-20
Classification: F01L,F02D,Y02T

Abstract:
1. A valve timing control apparatus for an engine, comprising: a variable valve mechanism capable of varying at least one of an opening timing of intake valves and a closing timing of exhaust valves in the engine, such that valve timing is selectively switched between a first timing in which a minus overlap exists between the closing timing of the exhaust valves and the opening timing of the intake valves prior to an exhaust top dead center, and a second timing in which no overlap exists between the closing timing of the exhaust valves and the opening timing of the intake valves; a first elapsed time detecting device that detects a first time period after a cold-starting of the engine; an actual engine speed detecting device that detects an actual engine speed of the engine; a target engine speed setting device that sets a target engine speed of the engine determined based on carburetion characteristics of fuel being used for the engine; a comparator device that compares the set target speed of the engine with the detected actual engine speed; and a timing control device that controls said variable valve mechanism, said timing control device switches, for the first period of time, the valve timing to the first timing, and maintaining, after the first period of time, the valve timing at the first timing when the detected actual engine speed is less than the set target speed.