Importance

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Abstract

A spark ignition internal combustion engine is provided including an intake manifold. A main throttle regulates the intake of ambient air into the intake manifold. An EGR pipe is connected between a point in the intake manifold downstream of the main throttle and a point in the exhaust system located downstream of the main restriction to exhaust gas flow. The exhaust gas pressure at the latter point is substantially constant during engine operation. An EGR throttle is rigidly connected for movement with the main throttle. The EGR throttle has a similar geometry to the main throttle such that the flow cross sections of the main throttle and the EGR throttle are in a fixed predetermined ratio to one another for all positions of the main throttle.

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First Claim