汽车滑行试验速度间隔选取对精度的影响研究  

Research on the Influence of Speed Interval Selection on Accuracy of Vehicle Coast-down Test

作　　者：龚春忠 沈羡玉 刘金子 谢永东 Gong Chunzhong;Shen Xianyu;Liu Jinzi;Xie Yongdong(Zhejiang Hozon New Energy Automobile Co.,Ltd.trial production test department,Zhejiang Jiaxing 314000)

机构地区：[1]浙江合众新能源汽车有限公司试制试验中心

出　　处：《汽车实用技术》2019年第24期58-60,78,共4页Automobile Applied Technology

基　　金：浙江省科技计划项目（2018C01056）

摘　　要：汽车行驶阻力通常使用滑行试验确定,现有数据处理方法存在精度不高、需要预先滤波处理等问题。文章基于构建理想模型做数据处理方法,研究速度间隔与阻力系数精度的关系,并提出使用直接拟合t-v曲线,精度更高且数据处理过程更方便。理想模型数值分析可知,误差与速度间隔的平方成正比。实际案例应用表明,使用速度间隔趋于0的直接t-v曲线拟合法,精度更高且无需滤波处理。Vehicle driving resistance is usually determined by taxiing test.The existing data processing methods have some problems,such as low accuracy and need to be pre-filtered.Based on the ideal model,this paper explores the data processing method,studies the relationship between the velocity interval and the accuracy of resistance coefficient,and proposes to use direct fitting T-V curve,which has higher accuracy and more convenient data processing.The numerical analysis of the ideal model shows that the error is proportional to the square of the velocity interval.The practical application shows that the direct t-v curve fitting method with velocity interval tending to zero has higher accuracy and no filtering is needed.

关 键 词：汽车滑行试验 道路阻力 速度间隔 阻力曲线拟合 

分 类 号：U467.19[机械工程—车辆工程]