Abstract: In order to develop a rapid aging method and to evaluate the durability of GPF, an accelerated ash depostion method of GPF is developed in this study. Based on the accelerated ash deposition method, the effects of GPF ash accumulation on particle emissions, back pressure, and fuel consumption of a GDI vehicle are studied on the engine test bench and the chassis dynamometer. Finally, the ash distribution and composition are analyzed by computed tomography (CT) and x-ray fluorescence (XRF).The test results show that the ash deposition efficiency of the GPF is increasing over time and finally stabilizes at about 30%. The vehicle equipped with GPF can meet CN6 particle emission limits under WLTC test cycle. With the ash accumulation in the GPF, the GPF can maintain its filtration efficiency, which is 82% for PM and 99% for PN. The ash accumulation in the GPF can increase the GPF back pressure, with the maximum value of 6.5 kPa, while it has little influence on the vehicle fuel consumption according to the test results of WLTC test cycle, with the maximum of 1.25%.The ash is mainly composed of CaO and P₂O₅ at a content of 71.2% of the total mass, which is mainly deposited at the end, especially in the central area of GPF.

Key words: gasoline direct injection vehicle, gasoline particulate filter (GPF), accelerated ash accumulation, worldwide harmonized light vehicles test cycle (WLTC), durability