Patent ID: 6408806
Filing Date: 2002-06-25
Classification: F01L,F02D,Y02T

Abstract:
A valve operating system of an internal combustion engine enabling both valve working angle and phase to be varied, the valve operating system comprising:a working angle control mechanism which variably controls a working angle of an intake valve; a first actuator which drives the working angle control mechanism in response to a supply pressure of working fluid; a phase control mechanism which variably controls a phase of the working angle of the intake valve; a second actuator which drives the phase control mechanism in response to a supply pressure of working fluid; a temperature sensor which detects a temperature of the working fluid; a control section which controls the supply pressure to each of the first and second actuators; and the control section limiting a controlled variable of at least one of the working angle control mechanism and the phase control mechanism in a cold-engine state in which the temperature of the working fluid is less than a predetermined temperature value, as compared to a hot-engine state in which the temperature of the working fluid is greater than or equal to the predetermined temperature value.