Integration optimization of novel electric power steering system based on quality engineering theory

ZHAO Wan-zhong(赵万忠)^{1, 2, 3}, ZHAO Ting(赵婷)¹, LI Yi-jun(李怿骏)¹, WANG Chun-yan(王春燕)¹, ZHANG Zong-qiang(张宗强)¹, DUAN Ting-ting(段婷婷)¹

(1. Department of Automotive Engineering, Nanjing University of Aeronautics and Astronautics,Nanjing 210016, China;2. Automobile Engineering Key Laboratory of Jiangsu Province, Jiangsu University, Zhenjiang 212013, China;3. State Key Laboratory of Mechanical Transmission (Chongqing University), Chongqing 400044, China)

Abstract:The dynamic model of a novel electric power steering (EPS) system integrated with active front steering function (the novel EPS system) is built. The concepts and quantitative expressions of the steering road feel, steering sensibility, and steering operation stability are introduced. Based on quality engineering theory, the optimization algorithm is proposed by integrating the Monte Carlo descriptive sampling, elitist non-dominated sorting genetic algorithm (NSGA-II) and 6-sigma design method. With the steering road feel and the steering portability as optimization targets, the system parameters are optimized by the proposed optimization algorithm. The simulation results show that the system optimized based on quality engineering theory can improve the steering road feel, guarantee steering stability and steering portability and thus provide a theoretical basis for the design and optimization of the novel electric power steering system.

Key words:vehicle engineering; electric power steering; active front steering; road feel; genetic algorithm