The effects of different soot loads on gasoline particle filter（GPF）performance under steady engine conditions were studied on a test bench based on turbocharged direct injection engine. The results show that the back pressure of GPF is closely related to engine working conditions and soot loads. The back pressure increases fast and then slowly with the increase of GPF soot load and increases fast at high speed and load. Under different carbon loads, the filtration effect of GPF on nuclear particles is better than that on accumulated particles. The total filtration efficiency of GPF remains above 98.71% when the soot load of GPF is lower than the regeneration limit. The moderate soot load of GPF helps to improve the filtration efficiency, but too high soot load causes the decrease of GPF filtration efficiency, which is unfavorable to engine power and fuel economy.
