F2010A137
Experiences of Retrofit Particulate Filters for Diesel City Buses and Passenger Cars
In this project the reduction potential of retrofit by diesel particle filter (DPF) was evaluated regarding particulate emissions, and experiences were collected for their large scale introduction. Partial flow and wall flow working, continuously regenerating trap (CRT) from different manufacturers were investigated on articulated city buses manufactured by IKARUS and powered by six-cylinder, direct injection, 160 kW Euro-II RÁBA engine. The emissions were measured according to the Regulation ECE-R-49.02, besides gravimetric method the particulate number and size distribution were measured too. In real life bus operation the smoke emission, the noise level, and acceleration were tested before and after retrofitting, and continuously the backpressure before the DPF and its inlet exhaust gas temperature were monitored by a data logger. A large reduction of the particulate emissions (90-95%) could be achieved by the wall flow DPF-s. The degrees of decrease were the same in case of gravimetric and particle number measurements. The CO and HC emissions were also effectively (by 85-95%) reduced. The tested passenger car was a EURO-4 level Opel-Astra, in this case only partial flow CRT were investigated according to Regulation ECE-R-83.04. The reduction of the particulate emissions was between 20-40%. The noise level measured outside of the test vehicles remained unchanged. The reliable operation of wall flow type DPF can be controlled by the continuous measurement of the back-pressure. No remarkable increase of the fuel consumption and decrease of the power were recognised after the retrofitting. Follow up field tests are going on city buses to evaluate the durability of CRT. Keys-words: diesel vehicle, particulate emissions, particulate filters, retrofitting, emission measurements, particle measurements, gravimetric analysis, number/size distribution.
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Session: Consumption and Emission Reduction