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Particulate regeneration technique has been improved under consideration of preventing excess heat and stable regeneration. Effort has been paid for these considerations, and tests under vehicle operating condition are considered to be important for more actual use. Electric heater is selected for the current regeneration heat supply under consideration of compactness and cost for light heavy duty diesel truck. Parameters which should be controlled at regeneration are particulate loading, supplied air flow rate, air flow distribution and heated trap inlet temperature. Initial trap inlet temperature affects internal trap temperatures and their distribution during regeneration. Results of vehicle evaluation on road and short durability test on chassis dynamometer are included, and required improvements are discussed.

To reduce diesel particulate, particulate trap systems were developed and tested. This paper describes briefly the test results of them. Also it describes the test results and problems of the systems on which research and experiments are being continued. First, particulate trap systems were developed and tested for the light duty diesel. Then, shift was made to the development and test of the particulate trap system for the heavy duty diesel. The results showed that, particulate loading, trap inlet temperature, amount of gas supplied to the trap and gas supply timing were required to control for stable regeneration and preventing the damage of the trap.