电动助力转向系统优化标定方法研究

针对现有的电动助力转向系统(EPS)标定参数复杂、标定周期长、标定效果不理想问题,提出了一种EPS系统控制参数的优化标定方法。建立了EPS系统和二自由度整车数学模型;提出EPS系统性能评价指标,研究EPS系统控制参数与所提性能指标之间的关系曲线,并提出以转向稳定性为约束条件,以路感频域能量平均值最大和助力特性动态误差总方差最小为优化目标的控制参数优化标定模型。试验表明这种优化标定方法可以使EPS系统性能得到提高,有效指导标定人员进行参数标定,缩短EPS系统的研发周期。

Research on the Optimized Calibration Method of Electric Power Steering System

A Optimized Calibration method for the control parameters of the electronic power steering (EPS) system is put forward as there are such problems as the complication of calibration parameters, the long of calibration period and the unsatisfied result of calibration effect for the current Calibration of the EPS. An EPS system and the mathematical model of the whole vehicle are constructed in this paper.The evaluation index of steering performance for the EPS is proposed and the relation curve between EPS system control parameter and the steering performance index is studied. The optimal model for control parameters is provided based on the optimization objective and constraint condition of steering stability,where the optimized objective is the maximum average of steering road feel energy in frequency domain and constraint condition of steering stability is the minimum total variance of assist characteristic dynamic errors. The test result show that the Optimized Calibration Method can improve the EPS system performance, instruct staffs to calibrate index effectively and shorten the development period of EPS system.