沙地越野场景下新能源汽车差速系统可靠性方法研究及应用

Research and Application of Reliability Method of Differential System of New Energy Vehicle in Off-road Scene on Sandy Surface

基于新能源汽车差速系统考核现状,结合差速系统搭载在越野/轿跑车型上开展越野场景/赛道工况场景路试过程中出现的差速系统失效问题,分析研究了新能源汽车差速系统搭载在越野车型上的应用场景、工作原理、损伤机理和失效形式,采用了Archard损伤模型进行损伤校核。基于聚类分析对路试车辆采集的海量实车数据进行筛选提取,并在此基础上转化为动力总成台架验证测试工况,复现了路试车辆差速系统故障,形成了新能源汽车沙地越野场景下的差速系统可靠性考核能力,为差速系统选型和优化、新车型开发提供了支持。同时,本文对如何提高差速系统的性能和可靠性,也具有一定的参考价值。

Based on the current assessment status of the differential system of new energy vehicles,combined with the invalidation problem of the differential system installed on the cross-country type/sport sedan type,in the process of cross-country scene/racing track scene driving test,the application scenes,working principles,damage mechanisms and invalidation forms of the differential system installed on the cross-country type are analyzed in this paper.The Archard damage model is used for damage verification.Based on clustering analysis,the massive real automobile testing data collected from road test are screened and extracted,and then transformed into powertrain bench verification test conditions.The fault of the differential system of the road test automobile is reproduced,forming the reliability assessment ability of the differential system in the sand off-road scenario of new energy vehicles,which provides support for the selection and optimization of differential systems and the development of new automobile models.Meanwhile,this article also has certain reference value on how to improve the performance and reliability of differential systems.