| 摘要 |
An additional vacuum servo is provided to be associated with a vacuum servo of an air supply control valve controlling the amount of atmospheric air fed into a vacuum actuator of an EGR control valve and is operable, in response to the vacuum in the vacuum actuator reduced by the fed atmospheric air, to minutely adjust the degree of opening of the air supply control valve to minutely adjust the amount of the atmospheric air fed into the vacuum actuator. |
