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In recent years, since the demands for comfortable operation and low fuel consumption are increasingly enhanced on the industrial machines, non-road engines as power sources on agriculture, landscape and construction applications are required to be achieved high power, low fuel consumption and low noise. Also, even for small engines, it is necessary to keep up with the trend of electronic control devices on these machines. Based on such backgrounds, we developed new non-road direct injection diesel engines with common rail system to satisfy those demands. This paper reviews the technologies to achieve the adoption of common rail system onto such small displacement industrial engines and to optimize the combustion system and injection characteristics.

In recent years, small diesel engines for industrial use are required to achieve still higher power output per engine size (higher power density) and to have the performance to comply with stringent exhaust emissions standards as well. Therefore, engine makers need to meet these two demands in a short term. In this paper, we introduced techniques for lower exhaust emissions such as optimization of combustion system and higher power density such as reduction of heat load, noise and vibration. These techniques were utilized in process of a new DI diesel engine development effectively.