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A Study of Recirculation Stratified Combustion Concept in a Center Injection DISI Engine with Lower Injection Pressure
Published October 22, 2008 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
The authors previously proposed a new stratified combustion concept in a direct injection park ignition engine. The fuel injected from a center-located, high-pressure injector (up to 100 MPa) produces circulating flow in the piston cavity, and accelerates mixing of fuel and air. Due to the high homogeneity and turbulence in the stratified mixture, this combustion concept has high tolerance for EGR which contributes to NOx reduction. The operating load range of stratified combustion was limited by the piston cavity volume, and the range was expanded by using concentric dual-piston cavity. In the present study, fuel pressure was lowered to the point of realistic production level (20 MPa). The mixture formation process and combustion characteristics in the single- and dual-piston cavity were investigated.