| EFFECT OF METALLIC GPF ON THE MICRO CHARACTERISTICS OF
SOOT PARTICLES OF GDI ENGINE |
| Cheng Liu, Zhihao Ma, Zhenlong Yin, Weixin Du, Enyu Lv |
| Henan University of Science and Technology |
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| ABSTRACT |
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High-resolution transmission electron microscopy (HRTEM) was used to observe the soot particles emitted from
gasoline direct injection (GDI) engine equipped with metallic particulate filter (GPF). The changes of microscopic morphology
and structure of the soot particles at pre-GPF and post-GPF were studied at a fixed speed of 1500 r/min and 25 %, 50 % 75 %
and 100 % load, respectively. Furthermore, the micro-parameters of the primary particles that make up the soot particles were
analyzed. The results show that the primary particles are approximately spherical, and agglomerate to form irregular shapes
such as chains, branches and rings. The load and GPF have no significant influence on the microscopic morphology of the soot
particles, the fractal dimension of soot particles at both ends of the GPF increases with the increase of load. Under the
experimental conditions of the engine, most primary particles consisting of the soot particles are “shell-core” structure; The
fringe length, tortuosity and interlayer spacing of the primary particles at pre- and post-GPF are monomodal. Among them, the
average fringe length increases with the increase of load, while both the average tortuosity and average interlayer spacing
change the opposite. These indicated that the degree of graphitization of the soot particle increases with the increasing load.
Load and GPF only affect the micro-structure parameters of the primary particles and have no effect on its distribution. |
| Key Words:
Gasoline direct injection engine, Gasoline particle filter (GPF), High-resolution transmission electron
microscopy (HRTEM), Micro-structure, Fractal dimension |
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Corresponding Author.
Zhihao Ma , Email. 
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