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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.

Very wide ranging applications or versatility are required to industrial diesel engines. Moreover, engines should be fitted the market trends, that are such as high reliability, low fuel consumption, and/or compact size with high output power (high power density). In addition, in recent years, exhaust emissions regulations have been getting strict; hence the further emission reduction is required in keeping and improving the above mentioned demands. From such backgrounds, we developed new direct injection turbo diesel engine for industrial use, that satisfies the market needs with a high level by adopting the new concept engine structure and the emission reduction devices.