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Influence of Divided-Chamber Parameter in DME IDI Compression Ignition Engine
Published May 19, 2004 by Society of Automotive Engineers of Japan in Japan
Event: 2004 JSAE Annual Congress
As the DME fuel supply method for small compression ignition (CI) engine, IDI CI engine with low pressure fuel injection was attempted. It was understood that stable combustion was obtained at around TDC injection because the mixture was rapidly formed due to the swirl which was evolved in the divided-chamber. Consequently, high thermal efficiency and low emission gas were able to be achieved in low load region due to selecting appropriate fuel injection timing. Moreover, the influence of the metabolism of the divided- chamber could be confirmed by changing the connecting passage area ratio as the parameter of the divided-chamber. The choking loss of the connecting passage could be reduced by setting an appropriate connecting passage area ratio. Then, it was experimentally clarified that the thermal efficiency did not deteriorate in the high load region where the supply calorie increased.