川野 大輔

Generally, the fuel efficiency of the diesel engine is higher than that of the gasoline engine. More emphasis will be placed on overcoming the fuel penalty caused by reducing exhaust emissions to comply with future stringent emissions regulations. In this study, combustion characteristics of a small diesel engine were experimentally investigated in case of multiple fuel injection strategies including pilot injection, pre-injection and after-injection. In addition, the effect of multiple injection timing on fuel consumption and heat balance was also identified. Engine heat losses were estimated by Hohenberg's empirical equation and were compared with the experimental results. The results indicate that multiple injection along with optimizing injection timing can reduce fuel consumption and heat losses.