| 摘要 |
A method of controlling exhaust gas recirculation in an internal combustion engine, by means of an exhaust gas recirculation control system including an exhaust recirculating passage connected between the exhaust passage and the intake passage of the engine, an exhaust gas recirculating valve arranged across the exhaust gas recirculating passage, and differential pressure-operated actuator device for varying the opening of the exhaust gas recirculating valve. The differential pressure-operated actuator device has a pressure-responsive member displaceable in response to a pressure difference between atmospheric pressure applied to one side surface thereof and a synthetic pressure of pressure within the intake passage and atmospheric pressure, applied to the other side surface thereof. The differential pressure-operated actuator device is adapted to vary the synthetic pressure in response to at least one operating parameter of the engine to control the exhaust gas recirculating valve. The atmospheric pressure and the pressure within the intake passage at a zone downstream of the throttle valve are detected. When the difference between the detected atmospheric pressure and the detected intake passage pressure is smaller than a predetermined value, the exhaust gas recirculating valve is controlled to a fully closed position.
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