电动助力转向(Electric Power Steering,EPS)系统作为一种机械传动机构,受路面扰动和传感器噪声的影响比较大,直接影响到EPS系统的转向路感。将EPS系统模型与线性二自由度整车模型相结合,建立EPS系统控制模型,并给出助力控制的目标函数...电动助力转向(Electric Power Steering,EPS)系统作为一种机械传动机构,受路面扰动和传感器噪声的影响比较大,直接影响到EPS系统的转向路感。将EPS系统模型与线性二自由度整车模型相结合,建立EPS系统控制模型,并给出助力控制的目标函数。根据EPS系统的频率分布,选取两个加权函数。通过转向盘把持力矩的幅频、相频特性及单位阶跃输入响应仿真计算,研究不同加权策略时助力控制对转向路感的影响。仿真结果可知,两个加权函数共同作用可以进一步改善EPS系统转向路感。展开更多
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,stee...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.展开更多
The vehicle model of the recirculating ball-type electric power steering (EPS) system for the pure electric bus was built. According to the features of constrained optimization for multi-variable function, a multi-obj...The vehicle model of the recirculating ball-type electric power steering (EPS) system for the pure electric bus was built. According to the features of constrained optimization for multi-variable function, a multi-objective genetic algorithm (GA) was designed. Based on the model of system, the quantitative formula of the road feel, sensitivity, and operation stability of the steering were induced. Considering the road feel and sensitivity of steering as optimization objectives, and the operation stability of steering as constraint, the multi-objective GA was proposed and the system parameters were optimized. The simulation results show that the system optimized by multi-objective genetic algorithm has better road feel, steering sensibility and steering stability. The energy of steering road feel after optimization is 1.44 times larger than the one before optimization, and the energy of portability after optimization is 0.4 times larger than the one before optimization. The ground test was conducted in order to verify the feasibility of simulation results, and it is shown that the pure electric bus equipped with the recirculating ball-type EPS system can provide better road feel and better steering portability for the drivers, thus the optimization methods can provide a theoretical basis for the design and optimization of the recirculating ball-type EPS system.展开更多
文摘电动助力转向(Electric Power Steering,EPS)系统作为一种机械传动机构,受路面扰动和传感器噪声的影响比较大,直接影响到EPS系统的转向路感。将EPS系统模型与线性二自由度整车模型相结合,建立EPS系统控制模型,并给出助力控制的目标函数。根据EPS系统的频率分布,选取两个加权函数。通过转向盘把持力矩的幅频、相频特性及单位阶跃输入响应仿真计算,研究不同加权策略时助力控制对转向路感的影响。仿真结果可知,两个加权函数共同作用可以进一步改善EPS系统转向路感。
基金Projects(51005115,51205191)supported by the National Natural Science Foundation of ChinaProject(QC201101)supported by the Visiting Scholar Foundation of the Automobile Engineering Key Laboratory of Jiangsu Province,China+1 种基金Project(SKLMT-KFKT-201105)supported by the Visiting Scholar Foundation of the State Key Laboratory of Mechanical Transmission in Chongqing University,ChinaProjects(NS2013015,NS2012086)supported by the Funds from the Postgraduate Creative Base in Nanjing University of Areonautics and Astronautics,and NUAA Research Funding,China
文摘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.
基金Projects(51005115, 51005248) supported by the National Natural Science Foundation of ChinaProject(SKLMT-KFKT-201105)supported by the Visiting Scholar Foundation of State Key Laboratory of Mechanical Transmission in Chongqing University, ChinaProject(QC201101) supported by Visiting Scholar Foundation of the Automobile Engineering Key Laboratory of Jiangsu Province, China
文摘The vehicle model of the recirculating ball-type electric power steering (EPS) system for the pure electric bus was built. According to the features of constrained optimization for multi-variable function, a multi-objective genetic algorithm (GA) was designed. Based on the model of system, the quantitative formula of the road feel, sensitivity, and operation stability of the steering were induced. Considering the road feel and sensitivity of steering as optimization objectives, and the operation stability of steering as constraint, the multi-objective GA was proposed and the system parameters were optimized. The simulation results show that the system optimized by multi-objective genetic algorithm has better road feel, steering sensibility and steering stability. The energy of steering road feel after optimization is 1.44 times larger than the one before optimization, and the energy of portability after optimization is 0.4 times larger than the one before optimization. The ground test was conducted in order to verify the feasibility of simulation results, and it is shown that the pure electric bus equipped with the recirculating ball-type EPS system can provide better road feel and better steering portability for the drivers, thus the optimization methods can provide a theoretical basis for the design and optimization of the recirculating ball-type EPS system.
