Patent ID: 6513469
Filing Date: 2003-02-04
Classification: F01L,F02D,Y02T

Abstract:
A variable valve operating system of an internal combustion engine comprising:a first variable mechanism capable of variably controlling at least a lift characteristic of one of engine valves including intake and exhaust valves depending on an engine operating condition; a second variable mechanism capable of variably controlling at least one of a valve-open and valve-close timing characteristic of the one engine valve depending on the engine operating condition; a position detector for detecting current actuated positions of the first and second variable mechanisms; and a controller being responsive to a failure position of one of the first and second variable mechanisms, detected by the position detector, for controlling movement of the other variable mechanism within a predetermined range that avoids interference between the engine valve and a piston and interference between the intake and exhaust valves when the one variable mechanism fails.