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A Study on Expanding Load Limits of Stratified Combustion in a DISI Engine With a Centrally Located High-Pressure Fuel injector
Published May 21, 2008 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Meeting
The authors previously proposed a new stratified combustion concept in which the fuel injector is located in the center of the combustion chamber. Because this stratified combustion process forms a highly homogeneous mixture cloud, combustion is stable at the time of EGR. As a result, the process is characterized by an exceptionally low level of NOx formation. It is also characterized by the variation in the optimal piston cavity volume depending on the engine load and the large impact of the piston cavity volume on fuel economy. In the present study, a small concentric piston cavity was provided inside an extra large piston cavity for the purpose of expanding the operating load limits of stratified combustion. The effect of the inner cavity on the mixture formation process of stratified combustion and combustion characteristics was investigated along with examining the influence of the inner cavity geometry on engine performance.