ðIn the recent years, heavy emphasis on reducing the BSFC while meeting the stringent emission norms
ðOver the past two decades, attempts have been made to develop an internal combustion engine for automotive applications that combines the best features of the SI and the diesel engines.
ðThe objective has been to combine the specific power of the gasoline engine with the efficiency of the diesel engine at part load.
ðResearch has indicated that a promising candidate for achieving this goal is a direct-injection, four stroke, sparkignition engine that does not throttle the inlet mixture to control the load.
ðIn this engine, a fuel spray plume is injected directly into the cylinder, generating a fuel-air mixture with an ignitable composition at the spark gap at the time of ignition.
ðThis class of engine is designated as a direct injection, stratified charge (DISC) engine
ðIn a manner similar to that of the diesel, the power output of this engine is controlled by varying the amount of fuel that is injected into the cylinder.
ðThe induction air is not significantly throttled, thus minimizing the negative work of the pumping loop of the cycle..