The dynanaic model of a novel electric power steering（EPS） system integrated with active front steer- ing function and the three-freedom steering model are built. Based on these models, the concepts and the quanti- ...The dynanaic model of a novel electric power steering（EPS） system integrated with active front steer- ing function and the three-freedom steering model are built. Based on these models, the concepts and the quanti- tative expressions of road feel, sensitivity, and operation stability of the steering are introduced. Then, according to constrained optimization features of multi-variable function, a genetic algorithm is designed. Making the road feel of the steering as optimization objective, and operation stability and sensitivity of the steering as constraints, the system parameters are optimized by the genetic and the coordinate rotation algorithms. Simulation results show that the optimization of the novel EPS system by the genetic algorithm can effectively improve the road feel, thus providing a theoretical basis for the design and optimization of the novel EPS system.展开更多
行车安全与驾驶员、车辆、道路等密切相关,而不同驾驶员个体之间的特性差异很大。文章将驾驶员分为A(熟练)、B(一般)、C(生手)3类,给定的行驶路径作为驾驶员模型的输入,转向盘转矩作为模型的输出;将A类驾驶员的输出转向盘转矩作为期望值...行车安全与驾驶员、车辆、道路等密切相关,而不同驾驶员个体之间的特性差异很大。文章将驾驶员分为A(熟练)、B(一般)、C(生手)3类,给定的行驶路径作为驾驶员模型的输入,转向盘转矩作为模型的输出;将A类驾驶员的输出转向盘转矩作为期望值,考虑不熟练驾驶员因对侧向力感知缺乏而导致的误操作转矩的影响,提出了一种跟踪期望驾驶特性的汽车电动助力转向系统(electric power steering,EPS)控制策略,建立了能够表征驾驶特性(熟练程度等)并考虑误操作转矩的驾驶员模型,与车辆组成人-车闭环系统。仿真结果表明,采用跟踪期望驾驶特性的汽车EPS控制策略,改善了汽车的操纵稳定性,减轻了驾驶员的转向负担,从而验证了该控制策略的有效性。展开更多
基金Supported by the National Natural Science Foundation of China(51005115)the Risiting Scholar Foundation of the State Key Lab of Mechanical Transmission in Chongqing University(SKLMT-KFKT-201105)theScience Fund of State Key Laboratory of Automotive Satefy and Energy in Tsinghua University(KF11202)~~
文摘The dynanaic model of a novel electric power steering（EPS） system integrated with active front steer- ing function and the three-freedom steering model are built. Based on these models, the concepts and the quanti- tative expressions of road feel, sensitivity, and operation stability of the steering are introduced. Then, according to constrained optimization features of multi-variable function, a genetic algorithm is designed. Making the road feel of the steering as optimization objective, and operation stability and sensitivity of the steering as constraints, the system parameters are optimized by the genetic and the coordinate rotation algorithms. Simulation results show that the optimization of the novel EPS system by the genetic algorithm can effectively improve the road feel, thus providing a theoretical basis for the design and optimization of the novel EPS system.
文摘行车安全与驾驶员、车辆、道路等密切相关,而不同驾驶员个体之间的特性差异很大。文章将驾驶员分为A(熟练)、B(一般)、C(生手)3类,给定的行驶路径作为驾驶员模型的输入,转向盘转矩作为模型的输出;将A类驾驶员的输出转向盘转矩作为期望值,考虑不熟练驾驶员因对侧向力感知缺乏而导致的误操作转矩的影响,提出了一种跟踪期望驾驶特性的汽车电动助力转向系统(electric power steering,EPS)控制策略,建立了能够表征驾驶特性(熟练程度等)并考虑误操作转矩的驾驶员模型,与车辆组成人-车闭环系统。仿真结果表明,采用跟踪期望驾驶特性的汽车EPS控制策略,改善了汽车的操纵稳定性,减轻了驾驶员的转向负担,从而验证了该控制策略的有效性。
