Investigations on the soot combustion performance enhancement of a catalytic gasoline particulate filter in equilibrium state for reducing the BSFC of gasoline direct injection engine

摘要

In catalytic gasoline particulate filter (CGPF), the higher soot oxidation rate and lower pressure drop symbolize the good soot combustion performance. In this work, the index for evaluating the catalytic efficiency is defined. Then, the effects of filter structural parameter on the catalytic efficiency and soot combustion performance of CGPF when it reaches equilibrium state are investigated through numerical simulation. The change rules of gasoline engine power and brake specific fuel consumption (BSFC) are analyzed by using the GT-power software. The results indicate that properly increasing the filter porosity, filter length, and filter diameter, or decreasing the filter wall thickness is beneficial for the improvement of soot combustion performance. For practical application, CGPF will obtain the best soot combustion performance when the filter porosity is 0.46, the filter wall thickness is 0.2 mm, the filter length is 200 mm, and the filter diameter is 158 mm. Comparing the optimized structural size with the initial structural size, the catalytic efficiency increases by 5.3%, the soot oxidation rate increases by 24.1%, and the pressure drop decreases by 37.5%. Based on GT-power modeling and analysis, the optimized CGPF reduces the BSFC by 2.6% and increases the power by 8.9%.