Search Results

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.

Because of recent strong demands for environmental protection, all nonroad engines for agricultural and construction equipment should be conformed to the exhaust emission regulations in Japan, the United States and Europe. Some regulations include transient smoke standard at free acceleration in addition to exhaust emissions at steady state condition such as nitrogen oxides (NOx), hydrocarbon (HC) and particulate matter (PM). Therefore, especially a turbo charged diesel engine needs a countermeasure to reduce the smoke level at free acceleration. This study confirms a mechanism of the smoke discharge at free acceleration and realizes that the injection pattern of the PFR injection pump with timer function reduces the smoke level at free acceleration. As a result, we could develop the engine complied with the transient smoke standard without boost compensater, with which it is very difficult for small engines to make a fine adjustment of proper fuel delivery.