| 摘要 |
The throttle valve of an automotive engine carburetor is positioned at times by a vacuum servo means to maintain or establish a predetermined engine idle speed rpm. The engine exhaust gas recirculation (EGR) valve is also controlled by a vacuum servo means to schedule EGR flow. The two servo means time share the vacuum by means of a computer controlled type electronic control so that when the throttle valve is in closed throttle idle speed position, the EGR servo means is not controlled, and when the throttle valve is in an off-idle setting, the EGR servo means is operative and the throttle valve servo means not. |
