| 摘要 |
<p>PURPOSE:To prevent maloperation of the valve body of a negative pressure control valve due to adhesin of adhesive substance to an atmosphere introducing port at stopping operation. CONSTITUTION:In an exhaust circulating device to control an exhaust circulating quantity through a step motor 3 adjusting the valve opening pressure of a diaphragm type negative pressure control valve 1, a stop control means 32 is provided to hold the valve body 9 of the negative pressure control valve 1 at the position apart from an atmosphere introducing port 10 through the step motor 3 at stopping operation of the engine.</p> |
