集成主动转向功能的电动助力转向参数优化(英文)

建立了融合主动转向功能的电动助力转向系统(新型EPS系统)动力学模型和整车三自由度转向模型;提出了新型EPS系统转向路感、转向灵敏度和转向稳定性的概念及量化公式;并根据多元函数有约束优化问题的特点设计了遗传算法。以转向路感为优化目标,以转向稳定性和转向灵敏度为约束条件,对EPS系统参数进行了多参数变量优化设计。仿真结果表明:应用多目标遗传算法进行EPS系统参数优化可在保证系统具有较好的转向稳定性和转向灵敏度基础上,有效提高了系统的转向路感,为新型EPS系统的设计和优化提供了理论基础。

PARAMETER OPTIMIZATION OF ELECTRIC POWER STEERING INTEGRATED WITH ACTIVE FRONT STEERING FUNCTION

The dynanaic model of a novel electric power steering(EPS)system integrated with active front steering function and the three-freedom steering model are built.Based on these models,the concepts and the quantitative 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.