Control unit of electromagnetically driven valve and control method thereof

摘要

A control unit controls an electromagnetically driven valve (20) including a valve body (21), an electromagnetic drive portion (30) and a spring so as to be 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 (46, 48) each urging the valve body towards a valve opening end position and a valve closing end position, respectively. The control unit includes a controller (51), 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 (21) is operated. <IMAGE>