Abstract
Heat release rate controlling and simultaneous reduction in NOx and smoke emissions were achieved by using the new combustion system which is a single-cylinder heavy-duty diesel engine equipped with three injectors (multi-injector). However, it is revealed that the heat release rate by the side injector was slower than that of center injector especially at the end of combustion. In this study, multi-injection from the center injector was attempt for expanding operating range to a high-load operation in order to shorten the combustion period. Furthermore, the mixture formation and combustion process in the cavity were observed by a bottom view visualization system. By the combination of higher boost pressure and precise heat release rate controlling to suppress the maximum in-cylinder pressure in constant, which resulted in heat loss reduction together with brake thermal efficiency improvement, and simultaneous reduction in NOx and smoke emissions even in a high-load operation region.
