| 摘要 |
An internal combustion engine equipped with an exhaust gas recirculating system is provided. The exhaust gas recirculating system comprises an EGR valve normally closing an EGR duct to prevent recirculation and movable by a signal vacuum applied thereto to an open position and control means operable to provide a signal vacuum. The control means includes a vacuum line connecting a vacuum port communicating with the carburetor throttle bore above the idle speed position of the throttle valve to the EGR valve, air bleed means including a vent in the vacuum line and flow restricting means in the vacuum line fluidly intermediate the vacuum port and vent. The air bleed means includes an air bleed control valve movable into and out of the vent to close or open the same; spring means biasing the air bleed valve closed; servo means connected to the air bleed control valve for moving it to an open vent position in response to vacuum in the vacuum line intermediate the flow restricting means and EGR valve; means for biasing the servo means in response to the engine intake manifold vacuum in a direction to move the air bleed control valve to an open vent position; and means for biasing the biasing means to vary movement of the air bleed control valve to an open vent position.
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