Patent ID: 8015957
Filing Date: 2011-09-13
Classification: F01L,F02D

Abstract:
1. A variable valve device system, comprising: a variable valve device for modulating movement of a valve for an internal combustion engine by using hydraulic fluid pressure; a control valve operatively connected with the variable valve device to control supplying to and discharging from the hydraulic fluid pressure; a control device operatively connected with the control valve to control an actual valve movement to a target valve movement by operating the control valve, wherein the control device includes: means for detecting or estimating a hydraulic fluid temperature; means for setting an offset component in accordance with the hydraulic fluid temperature; and means for offsetting an operating amount of the control valve by the offset component, wherein the offset component setting means sets the offset component differently depending on controlling directions; the variable valve device includes a biasing member that biases the variable valve device in a biasing direction that is one of the controlling directions, and the offset component setting means sets the offset component smaller when the controlling direction coincides with the biasing direction than that when the controlling direction opposes the biasing direction.