混合动力车型传动系耐久性试验方法研究

Study on Durability Test Method of Hybrid Electric Vehicle Drive System

本文是以传统车传动系耐久性试验方法为基础,依托红旗H7混合动力车型进行传动系耐久性试验方法研究,红旗H7混合动力车型是以传统车为基础,匹配新型DCT变速器及电驱系统,在起步、爬坡、加速等工况均存在电机与发动机的单独或联合驱动,在制动、下坡及滑行等工况存在电池能量回收,混合动力车型传动系结构及控制原理比传统车复杂多变。目前传统车传动系耐久性已有较为成熟的方法,但尚不能满足混合动力车型多工况多控制的模式要求,无法完成传动系耐久性验证。基于此,本文在广泛研究可靠耐久性试验方法的基础上,提出基于用户信息正向开发的耐久性试验流程,通过四步法建立混合动力车型传动耐久性试验方法,主要研究如下:首先,路谱采集分析。通过对全国已知的C级车典型用户工况进行统计分析,确定长春地区市区、郊区及高速公路等路面采集的比例关系,为混合动力车型路谱采集提供依据。其次,损伤分析。使用LMS TecWare软件,建立混合动力车型传动系中变速器输入轴、各挡齿轮的伪损伤分析方法,通过Minitab软件进行频数累加分析,然后对各挡位平均损伤对比分析,确定用户工况数据中各挡位齿轮最大损伤与路面比例的对应关系。再次,寿命估计。通运用过威布尔概率分布估计,计算出95%用户的损伤值;最后,方法建立。通过用户路谱数据与试验场路谱数据对比分析,得到等效用户使用寿命的传动系统加速耐久性试验方法。

This paper is based on the traditional durability test method of transmission system, relying on the Hongqi H7 hybrid electric vehicle to study the durability test method of transmission system. The Hongqi H7 hybrid electric vehicle is based on the traditional vehicle, matching the new DCT transmission and electric drive system. In the starting, climbing and accelerating conditions, there are separate or combined drive of motor and engine, which are braking, downhill and sliding. Battery energy recovery exists in running and other working conditions. The structure and control principle of hybrid electric vehicle transmission system are more complex and changeable than that of traditional vehicle. At present, there are mature methods for the durability of transmission system of traditional vehicles, but they can not meet the mode requirements of multi-working conditions and multi-control of hybrid electric vehicles, and can not complete the durability verification of transmission system. On the basis of extensive research on reliable durability test methods, this paper puts forward a durability test process based on user information forward development, and establishes a transmission durability test method for hybrid electric vehicles through four-step method. The main research contents are as follows: Firstly, spectrum acquisition and analysis, Based on the statistical analysis of the known typical user conditions of Class C vehicles in China, the proportion of road surface acquisition in urban, suburban and expressway areas of Changchun is determined, which provides a basis for the road spectrum acquisition of hybrid electric vehicles. Secondly, damage analysis. Using LMS TecWare software, the pseudo-damage analysis method of transmission input shaft and gear in hybrid electric vehicle transmission system is established. The frequency cumulative analysis is carried out by Minitab software, and then the average damage of each gear is compared and analyzed to determine the corresponding relationship between the maximum damage of each gear and the proportion of road surface in user's working condition data. Thirdly, life estimation, By using Weibull probability distribution estimation, the damage value of 95% users is calculated. Finally, the method is established. The accelerated durability test method of transmission system with equivalent user life is obtained by comparing and analyzing the user road spectrum data with the test site road spectrum data.