Stratified Exhaust Gas Recirculation (SEGR) can enable a spark ignition engine to tolerate more exhaust gas recirculation than when the EGR is premised in the intake manifold. Experiments were conducted on a VW aircoaled engine modified to incorporate exhaust gas transfer ports in the cylinder walls. A unique arrangement of interconnected ports allowed the exhaust blow-down pressure from one cylinder to push EGR into a high swirl velocity during the intake stroke of an opposite cylinder. In-cylinder swirl of the EGR was the stratification mechanism. Evidence of effective stratification is that the engine could tolerate 262 SEGR via the ports but could tolerate only 10% EGR via the intake manifold.The benefit of SEGR is improvement in part-load fuel economy. Efficient part-load operation may be achieved by controlling the amount of SEGR, rather than by throttling the intake. Thus pumping loss is decreased. Gains in fuel economy were measured at 10% in the experimental engine.


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    Title :

    Stratified Exhaust Gas Recirculation in a S. I. Engine


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE International Congress and Exposition ; 1986



    Publication date :

    1986-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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