Patent ID: 6817324
Filing Date: 2004-11-16
Classification: F01L

Abstract:
A control unit of an electromagnetically driven valve including a valve body, an electromagnetic drive portion and a spring, the valve body of the electromagnetically driven valve being opened and closed by an electromagnetic force of the electromagnetic drive portion and a spring force of the spring that is formed of a pair of gas pressure springs each urging the valve body towards a valve opening end position and a valve closing end position, respectively, the control unit comprising a controller, when an operation of the valve body is stopped and held in a holding position that is one of the valve opening end position and the valve closing end position, decreases a gas pressure of one of the pair of gas pressure springs that urges the valve body towards a non-holding position opposite to the holding position so as to become lower than a gas pressure of the one of the pair of gas pressure springs that urges the valve body towards the non-holding position when the valve body is operated,wherein the controller, when the operation of the valve body is stopped and held in the holding position, decreases an amount of gas filled in a pressure chamber of the one of the pair of gas springs that urges the valve body towards the non-holding position such that the amount of gas becomes smaller than an amount of gas filled in the pressure chamber of the gas pressure spring that urges the valve body towards the non-holding position when the valve body is operated.