Study on particle classification and micro morphology of gasoline engine before and after GPF

Based on a gasoline engine bench, DLPI particles were collected at the front and rear ends of the GPF at a rotational speed of 2100r/min and a load of 75%. The collected particles were scanned with a transmission electron microscope and analyzed for their microscopic morphology. The results show that the basic particles of particles are almost spherical, and GPF has no obvious effect on the micro morphology of particles. The particles collected in the first to fourth stages of DLPI are less affected by GPF, and the particles collected in the fifth to eighth stages are more affected by GPF. The aggregation degree of the basic particles of level 1 to level 8 particles tends to rise first, then fall and then rise from level one to level eight, which may be due to the relatively tight structure of small particles and the relatively loose structure of large particles.