Application of Diesel Particulate Filter to heavy duty diesel truck (2) Effects on diesel exhaust emission of Diesel Particulate Filter

• Published in: Journal of Japan Society for Atmospheric Environment / Taiki Kankyo Gakkaishi Vol. 34; no. 4; pp. 310 - 320
• Main Authors: YOKOTA, Hisashi, KOYANO, Shinji, ASAUMI, Yashuo, FUKUOKA, Saburo
• Format: Journal Article
• Language: English; Japanese
• Published: Japan Society for Atmospheric Environment 10.07.1999
• Subjects: diesel particulate filter; Exhaust Gas; Heavy Duty Diesel Truk; SOF; Soot; White Smoke
• ISSN: 1341-4178; 2185-4335
• DOI: 10.11298/taiki1995.34.4_310

A diesel particulate filter (DPF) using a SiC honeycomb with a high heat resistance was installed in a heavy duty diesel truck. During the field test of approximately 35, 000 km, exhaust gas was measured in the chassis dynamometer. The influence of the DPF installation on exhasut gas was investigated. The results were as follows. (1) With this DPF using SiC, pressure loss by the installation was small. Therefore, a big effect was not shown on exhaust gas or fuel consumption. (2) “White Smoke” was visually observed at regeneration. This phenomenon was confirmed as an increase of exhaust gas. (3) The total emission mass including the increase in this exhaust gas was calculated. Then, the total emission mass increased 1.19-1.31 times for THC and 1.53-1.79 times for CO, respectively, compared to no DPF. There was no influence on the NOx. On the other hand, the filtering efficiency of particulate matter (PM) was 83-88% by regeneration. The filtering efficiency decreased slightly compared to no regeneration. By a CO2 conversion method, filtering efficiency of the carbon component (as Soot) and the volatile component (as SOF) of PM was examined. The cause of the above-mentioned white smoke was examined. The results were as follows. (4) The filtering efficiency of Soot was nearly 100%. However, that SOF was about 60%. (5) It was confirmed that the majority of the white smoke originated in SOF. Therefore, to decrease these components improved filtering efficiency by adding an oxidation catalyst to DPF should be studied.