Control unit for electromagnetically driven valve

摘要

When a request to start driving a drive valve has been made, the ECU performs a program including a step in which time-measurement using a timer is started; a step in which an electric current I (0) is supplied to an open/close coil; a step in which a supply of an electric current is stopped when a period of T/4 has elapsed; a step in which the electric current I (0) is supplied to the open/close coil when another period of T/4 has elapsed; and a step in which a holding current I (h) is supplied to the open/close coil when the drive valve comes close to the valve opening position.