汽车EPS方案的模糊综合评价与排序研究

Study on the Fuzzy Evaluation and Ranking for Electric Power Steering Schemes

EPS转向感觉试验的评价涉及多个方面,要得到准确的对比评价结果比较困难.在应用模糊语言变量的基础上,将群体多准则决策和模糊多层次综合评价进行融合,采用轻便性、回正性、中间位置转向性能和移线性能及其对应的子因素作为评价因素集,利用标度法构建评价准则关系比较矩阵及模糊一致判断矩阵,并对各EPS方案对应的效用值进行模糊排序,既综合了专家群体意见,又合理保留了各级决策评价信息,从而保证了评价排序结果的可靠性,为EPS方案开发、参数优化提供了有效途径.

In order to evaluate vehicle steering feels of the electric power steering （EPS） system effectively, the maneuver ability of steering, the return ability of steering, the ISO lane change capability, and the on-center steering capability were adopted as test factors. On the basis of group multicriteria decision making and fuzzy analytical hierarchy process （AHP） method, the EPS hierarchic fuzzy evaluation model was established, and a simplified scale method was adopted to generate the judgment matrices meeting the consistency checking firstly. The drivers＇ opinions were aggregated to form triangle fuzzy numbers with fuzzy Delphi method. Finally EPS schemes were ranked with total utility values of fuzzy numbers and the optimal alternative could be selected. An example was given, under this approach, it shows that the decision making process was a systematic and practical method for EPS schemes selection.