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基于Romax的电驱总成等效里程核算及验证

2019-10-21崔华芳张明朗刘洋

汽车实用技术 2019年12期

崔华芳 张明朗 刘洋

摘 要:随着新能源汽车在我国的全面发展,各类不同的形式的动力总成应运而生。由于电动机特有的外特性,大部分新能源客车及A级乘用车的动力总成均采用了集成式的单挡变速箱,同一速比下需面对复杂的道路工况,且不同车型的总成寿命需求不尽相同,对总成可靠性的验证也提出了更高的要求。文章通过某一电动客车电动总成可靠性验证过程为例,以轮齿接触疲劳损伤为基础并基于Romax对等效里程进行理论校核,比对整车实际路谱,设计相应的台架工况,结合实际的测试结果,说明等效里程核算的有效性及必要性。

关键词:动力总成;可靠性;Romax;疲劳损伤

中图分类号:U467  文献标识码:A  文章编号:1671-7988(2019)12-105-04

Abstract: With the all-round development of new energy vehicles in China, various types of power assemblies emerge as the times require. Due to the unique external characteristics of motors, most of the powertrain of new energy buses and class A passenger cars adopt single-gear transmission. Under the same speed ratio, they need to face complex road conditions, and the assembly life needs of different models are different, which also puts forward higher requirements for the verification of assembly reliability. Based on the contact fatigue damage of gears and Romax, the equivalent mileage is theoretically checked through the reliability verification process of a bus powertrain, and the corresponding bench working conditions are designed by comparing the actual road spectra of the whole vehicle. Combining with the actual test results, the effectiveness and necessity of equivalent mileage calculation are illustrated.

Keywords: Power assemblies; Reliability; Romax; Contact fatigue damage

前言

动力总成的设计寿命需求基本等同于整车需要,对于总成的充分验证可以确认是其否能够满足要求。實际的路谱复杂多变,整车难以完全的运行寿命需求里程,一则试验时间过长,二则试验成本过高。

动力总成等效里程的核算主要目的是在于设计相应的台架试验工况,缩短台架可靠性试验的验证时间并充分验证总成的耐久能力。

通过对多辆实车的路谱数据分析,总结其数据特征,以便于编制台架工况。因齿轮的各类校核的理论方法都比较成熟,所以以齿轮的接触疲劳损伤理论为基础,根据ISO6336第6部分中工况的处理方式对实际路谱工况进行分解,整理成为可以用来校核计算的形式。而后设计台架工况,在Romax中建立样品模型,运算相应工况,对比台架和实际路谱的损伤值,折算出等效里程。……

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