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This paper reports on a field test with 23 Volvo D12C non-exhaust gas recirculation diesel engines using the Diesel Particulate Filter (DPF), Selective Catalytic Reduction (SCR), and urea system with Ultra-Low-Sulfur-Diesel (ULSD). This combination will be used to meet the on-highway emission standards for U.S. 2010, Japan 2010, and Europe 2013. Because of future widespread use of DPF-SCR, this study reports on our field experience with this system, and focuses on enhancing our understanding of the incombustible materials which are collected in the DPF with API CJ-4 and API CI-4 PLUS oils. The average weight of incombustibles was lower in the trucks using API CJ-4 oils at 1.0% sulfated ash, than in those using API CI-4 PLUS oils at 1.4% sulfated ash. The difference in weight between the two groups was highly significant. Further, the weight of the incombustibles per kilometer substantially decreased with each subsequent cleaning within a truck.

This paper reviews field test results in 23 Volvo D12C non-Exhaust Gas Recirculation (EGR) diesel engines using continuously regenerating Diesel Particulate Filter (DPF) with Selective Catalytic Reduction (SCR) and ultra low sulfur diesel fuel at 4-10 ppm. This 2-year field test provided an opportunity to measure on-road nitrogen oxide (NOx) emissions, and to do in-depth analysis of the incombustible material remaining in the filters. In addition, two crankcase oils were used at 1.0% and 1.4% sulfated ash to provide enhanced information on the material collected in the filters, and on oil drain capability. The study demonstrates that the U.S. Environmental Pro-tection Agency (EPA) 2007 emissions can be met. After 2 years in the field the 23 trucks using the DPF-SCR system are still providing a very high NOx conversion of 75% on fleet average. The filter material contained only 2 wt-% carbon, which demonstrates the effectiveness of the DPF-SCR system in combusting soot.