Importance

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Abstract

An exhaust gas recirculation system for an internal combustion engine, having an exhaust gas recirculation passage, a constant pressure chamber disposed at an intermediate portion of the exhaust gas recirculation passage, a pressure regulating valve operative in response to the exhaust gas pressure in the constant pressure chamber, a first flow-rate control valve actuated by vacuum regulated by the pressure regulating valve and adapted to open and close the exhaust gas recirculation passage and a second flow-rate control valve adapted to change the cross-sectional area of the exhaust gas recirculation passage in response to the level of load applied to the internal combustion engine. The exhaust gas recirculation system further has an atmospheric pressure introduction valve communicated with a vacuum passage through which the first flow-rate control valve is communicated with the pressure regulating valve and adapted to selectively introduce the atmospheric pressure into the vacuum passage in accordance with the level of the vacuum established in the intake manifold of the engine.

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First Claim