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某电动汽车蠕行抖动测试分析

2019-10-21王朝建,曾海军,肖扬

汽车实用技术 2019年23期

王朝建,曾海军,肖扬

摘 要:某电动汽车(以下简称“某车型”)D档蠕行,车速2~3km/h行驶时伴随整车抖动,严重影响车辆的驾乘舒适性。文章基于某主机厂在研车型存在的该问题进行测试分析,通过对振动信号的colormap进行分析,分析出电机的阶次振动是导致蠕行抖动的主要原因;通过对比该车型与标杆车的扭矩变化曲线,提出后续优化标定方案。文章研究为电动汽车蠕行抖动优化设计提供依据,对整车NVH性能提升有重要意义。

关键词:电动汽车;蠕行;抖动;测试分析

中图分类号:U462.3  文献标识码:A  文章编号:1671-7988(2019)23-05-03

Analysis of Creeping Shake Test of an Electric Vehicle

Wang Chaojian, Zeng Haijun, Xiao Yang

( Hunan Intelligence Automobile Co., Ltd., Hunan Zhuzhou 412007 )

Abstract: The electric vehicle, D, creeping, and the speed is 2-3km/h, accompanied by vehicle shake, which seriously affects the driving comfort of the vehicle. The article is based on the test and analysis of this problem in the research and development model of a host factory. By analyzing the colormap of the vibration signal, it is recognized that the order vibration of the motor is the main cause of creep jitter; by comparing the electric vehicle to the benchmark car, the torque variation curve is proposed, and the subsequent calibration optimization scheme is proposed. This paper provides a basis for the optimization design of creeping shake of electric vehicles, which is great significance to the improvement of NVH performance of the vehicle.

Keywords: Electric vehicle; Creeping; Shake; Test analysis

CLC NO.: U462.3  Document Code: A  Article ID: 1671-7988(2019)23-05-03

前言

電动汽车作为一种新能源交通工具,可解决传统汽车发动机燃油燃烧导致的尾气排放,具有低污染、低噪声、高效率等优点,是今后交通运输行业发展的重要趋势。

目前,国内市场上的电动汽车品牌及车型较多,但不少新兴主机厂对新能源车辆系统匹配及电控系统开发缺乏经验,且技术积累不足,导致不少车型不具备蠕行功能。车辆在高压上电完成,变速箱挡位挂至前进/倒退挡,松开制动踏板后车辆必须在踩下油门后才能起步行走;或车辆在蠕行过程中表现不佳,容易出现抖动及顿挫感。文章通过对驱动电机本体、方向盘及座椅导轨振动进行测试,通过试验手段分析蠕行抖动产生的原因,对整车NVH性能开发过程中VCU、MCU程序设计及驱动电机结构设计具有指导意义。

1 蠕行抖动测试

1.1 测试设备

本次试验借助LMS Test.lab数采前端及分析软件、CAN线、三向振动加速度传感器等附件完成。……

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