| 摘要 |
<p>A normally closed electromagnetic valve (50, 51, 52, 53, 56, 57, 58, 59) is closed again after temporarily being opened during an abnormality check of the valve (70; 80). When the valve (70; 80) is opened, electricity is supplied so that a plunger (78; 88) is moved by a coil (76; 86) but a back face of the plunger (78; 88) does not abut against a receiving face of a fixed portion. Because the plunger (78; 88) does not strike the fixed portion, no impact noise is generated. Also, when the valve (70; 80) is closed, the electricity is not instantly dropped to zero, but is gradually reduced. As a result, impact noise when the valve (70; 80) strikes the valve seat (71; 81) is able to be reduced. <IMAGE></p> |
