The EMS Control of PN Emission Based on GDI Engine Without GPF

PN emissions result has been clearly required to be less than 6 × 1011 in CHINA 6 regulations. The PN emission challenge is more difficult without GPF exhaust system. Taking vehicles equipped with China’s Top Ten engines, BAIC 1.5GDIT engine, and without GPF exhaust system as the research object, this research is focused on analysing the PN emissions of vehicles in the WLTC emission cycle under cold engine, warm engine, and high-speed heavy load conditions. Optimize the cold start air fuel ratio; Scan the cold engine injection mode, VVT, rail pressure, and ignition timing; Optimize the injection phase and transient fuel control during warm-up conditions; Optimize the injection mode under high-speed and heavy load conditions. The PN emission results were all within 50% of the limit value of the CHINA 6 limits used the EMS control strategy studied in this article, verified by different batches of test samples without GPF exhaust system.