Effects analysis on soot combustion performance enhancement of an improved catalytic gasoline particulate filter regeneration system with electric heating

The soot combustion performance of catalytic gasoline particulate filter regeneration system (C-GPFs) can be significantly improved by increasing the temperature of gasoline exhaust gas at low-temperature conditions. In this paper, firstly, the soot oxidation rate is introduced as an evaluation index for the combustion performance of C-GPFs, and a suitable electric heating power is defined. Secondly, based on the computational fluid dynamics software, the traditional and improved electric heating C-GPFs combustion performance is compared and analyzed, and the accuracy of the improved electric heating C-GPFs model is verified through experiments. Finally, the effects of critical exhaust parameters on the soot combustion performance and electric energy consumption of the electric heating C-GPFs is studied by numerical simulation. The results of the study show that: the electric energy consumption under the suitable electric heating power is reduced by 49.6% as the exhaust flow rate decreases from 0.023 kg/s to 0.017 kg/s. The electric energy consumption under the suitable electric heating power is reduced by 50.4% as the exhaust temperature increases from 558 K to 588 K. The electric energy consumption under the suitable electric heating power is reduced by 31.6% as the exhaust oxygen concentration increases from 1.6% to 2.4%. The electric energy consumption under the suitable electric heating power is reduced by 34.7% as the exhaust NO concentration increases from 0.08% to 0.12%. Finally, this work provides a direction for improving the soot combustion performance in gasoline engines at low-temperatures.