Optimal design of the key structural parameters in an electronic fuel injector

ZHANG Hekun, ZHANG Zhendong, XIE Nailiu

(Institute of Automotive Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China)

Abstract: Aiming at solving the problem of improving the dynamic response characteristics of the electronic fuel injector, the calculation model was established with help of the Ansoft Maxwell electromagnetic simulation software to analyze the effects of its key structural parameters on its dynamic response characteristics, including the thickness of yoke, outer diameter of core, length of armature, air gap , turns and resistor of coil. Based on the analyses, with these structural parameters as variables and the opening and closing delay time as objective functions, genetic algorithm was introduced into optimal design of these structural parameters, and the effectiveness of the optimal scheme was verified by simulation and experiment. The results indicate that after optimization, the opening and closing delay time can reduce by 33.1% and 37.1%, so its dynamic response characteristics are improved.

Key words: electronic fuel injector; opening delay time; closing delay time; genetic algorithm