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In order to reduce the amount of particulate matter (PM) in the exhaust gas of diesel engines, a dual flow type diesel particulate filter (DPF) system made of porous metal filters has been developed. In this paper, the development and the evaluation results will be discussed. The test results on the engine bench and the vehicle have revealed good performance of the DPF system and have practical application for urban buses.

Amidst the growing concerns for the global environment and the escalating demands for low exhaust emissions and high fuel economy small motorcycles, the electronically controlled fuel injection system (hereafter referred to as FI system) is making its appearance as an effective device to reduce emissions while improving fuel economy by precisely controlling the air-to-fuel ratio. Fuel injectors and fuel pumps currently used in small motorcycle FI systems were originally derived from multi-cylinder engine automobile and large motorcycle FI system components, and therefore have not been necessarily suitable for small motorcycle application.