Evaluation of Diesel Particulate Filter Systems for Urban Utility Automobiles

Five diesel particulate filter systems have been studied for their practicality in the case of their application to garbage trucks operating in urban areas. Driving data of garbage trucks operating in Tokyo were collected, and a driving pattern was prepared to evaluate filter systems. Test engines fitted with a wall-flow-monolith filter were in the range of 2.8 to 3.6 liters in displacement. Each test engine was operated for an accumulated loading time of 400 hours using an engine dynamometer. Regeneration used was electric heater, diesel fuel burner and intake-exhaust gas throttling. Regeneration temperature of the throttling system was lower and more stable than other systems at every regeneration. In the electric heater regeneration, on the other hand, the temperature distribution in the filter was different at every cycle, and its temperature gradient was steep.