Research on carbon deposition method and characterization of nozzle in direct injection gasoline engine

Based on Geely JLE-4G18TDB 1.8T gasoline engine stand and optical 3D profile measuring instrument, this paper explores the rapid carbon accumulation process and characterization about carbon deposition of nozzle in a direct injection gasoline engines. By using aging accelerators, cycle conditions and long-term fuel pulse width correction coefficient, rapid carbon accumulation close to actual road conditions is achieved. The carbon accumulation situation of the nozzle was mastered in the state of the engine without stopping, and the carbon accumulation characteristics of the nozzle were characterized by optical means. The volume data, three-dimensional image and carbon volume distribution map of the injector before and after carbon deposition were obtained under the condition that the carbon in the surface area of the injector was not destroyed, which played an important role in the evaluation of the gasoline purifier and purifier synergist.