Patent ID: 6772720
Filing Date: 2004-08-10
Classification: F01L,F02D,Y02T

Abstract:
A valve timing control device for an internal combustion engine, said device comprising:an exhaust valve control means for controlling an exchaust valve close timing of an exhaust valve installed in the internal combustion engine; and a first engine condition detection means for detecting or estimating an engine condition, wherein said exhaust valve control means advances or retards the exhaust valve close timing from an intake top dead center position based on the engine condition detected or estimated by said first engine condition detection means; said first engine condition detection means detects pressure in an intake line, and said exhaust valve control means advances the exhaust valve close timing from the intake top dead center position when the pressure detected by said first engine condition detection means is larger than a predetermined value and retards the exhaust valve close timing from the intake top dead center position when the pressure detected by said first engine condition detection means is smaller than a predetermined value.