双离合自动变速器车辆换挡品质模糊综合评价

Fuzzy comprehensive evaluation of shifting quality of vehicles equipped with dual clutch transmission

摘要:

双离合自动变速器车辆换挡品质评价过程中的主观评价方法常导致评价结果离散性大,且单纯的客观评价方法导致评价结果局限于数据而忽略主观知识指导,针对上述问题,从时间、纵向加速度和发动机转速3个维度确定了换挡品质评价指标,基于层次聚类方法和专家知识科学地建立了换挡品质评价体系；基于分配最优原则,结合德尔菲法与层次分析法获得换挡品质评价指标的主观权重,由变异系数法计算换挡品质评价指标的客观权重,再进行组合赋权得到综合权重计算模型. 提出基于数据差异性与模糊阈值的隶属度函数确定方法,建立换挡品质的模糊综合评价模型；试验验证了模糊综合评价模型与变异系数法在换挡品质评价上的有效性,并对比验证了模糊综合评价模型相对于单纯客观评价方法的有效性和准确性. 比较了模糊综合评价模型计算的换挡品质二级评价指标权重的大小,揭示了各指标对于换挡品质的重要程度,为改善整车的换挡品质提供了有效指导.

Abstract:

Now the subjective evaluation methods used in vehicles equipped with dual clutch transmission for shift quality causes the discreteness of evaluation results and the simple objective evaluation method leads to the evaluation results being limited to the data and ignoring the subjective knowledge guidance. The shift quality evaluation index is determined from three dimensions of time, longitudinal acceleration and engine speed. Based on the hierarchical clustering method and expert knowledge, the shift quality evaluation system is scientifically established. According to the evaluation system, the subjective weight of the shift quality evaluation index is obtained by combining the Delphi method and the analytic hierarchy process. The objective weight of the shift quality evaluation index is calculated by the coefficient of variation method, and the combined weight is given based on the principle of optimal allocation. Then the method of determining the membership function based on data difference and fuzzy threshold is proposed. Finally, the fuzzy comprehensive evaluation model of shift quality is established. The data based on the data difference and the fuzzy threshold are proposed. The experimental data is used to verify the effectiveness of fuzzy comprehensive evaluation model and coefficient of variation method in shift quality evaluation, and the fuzzy comprehensive evaluation model is verified more efficiency and accuracy, relative to the simple objective evaluation method. Each index reveals shift quality by re-evaluation of the right size for the two shift quality importance which provides effective guidance for improving the shift quality of the vehicle.