ELECTROMAGNETICALLY DRIVEN VALVE

摘要

An electromagnetically driven valve includes a valve (87) having a valve stem that reciprocates along the direction of extension of the valve stem, a disc (74), which is a magnetic member that moves in concert with the valve (87), a first electromagnet that includes a first coil (8) and attracts and holds the disc (74), a torsion bar (68) that applies a force to the disc (74) that moves the disc (74) away from the first electromagnet, and an ECU (30) that controls a magnetic force of the first electromagnet. The ECU (30) determines at least the current value immediately before decreasing the current flowing in the first coil (80), in accordance with a pressure in the cylinder when weakening the magnetic force of the first electromagnet to move the disc (74) away from the first electromagnet and open the valve.