Evaluation method of gasoline particulate filter regeneration interval mileage in a low-temperature environment

The gasoline particulate filter (GPF) regeneration interval mileage in a low-temperature environment was studied based on a temperature correction method for GPF soot load estimation.The GPF soot regeneration action rate was measured by the engine dyno test, and the activation energy of the regeneration reaction was obtained by the logarithm method and the line fitting method. It was shown that the activation energy of oxygen and soot was 81.6-91.4 kJ/mol, and that of carbon dioxide and soot was 159.2-218.9 kJ/mol. The activation energy was then used to calculate the correction coefficients for the soot regeneration action rate in variant environment temperatures. The accumulated velocity of the soots in the cold start stage of the test vehicle was measured, and the correction coefficients for soot emission in a low-temperature environment were acquired. Based on the type I test of CHINA 6 for light-duty vehicle emission, GPF active regeneration interval mileage in a low-temperature environment was simulated by applying the temperature correction coefficient of soot emissions and regeneration rate. Compared with GPF soot accumulation data from test vehicles driving on road in cold region, the simulation result had enough precision to predict GPF soot load accumulation rate for vehicle usage under different working conditions in cold region. Both the simulation and test results indicated that GPF soot accumulation rate was easily affected by low temperature when the vehicle running at low speed.