汽车滑行试验的校正技术研究
2020-10-21龚春忠
龚春忠



摘 要:汽车的行驶阻力通常由整车滑行试验获取,精确的道路阻力对整车动力性经济性开发有着重要的意义。文章研究滑行试验数据的处理方法,提出将风速、坡度、温度、气压、湿度纳入到校正的因素中,以获得更精确的道路阻力系数。文章对校正公式进行推导,提出一种一次性修正所有环境因素的公式,并得出了各因素修正对结果的影响程度大小。文章使用校正过的多组阻力数据在中国工况下的电机端能量消耗率作为结果的稳定性判据,结合测试理论,当有组别误差超过3σ区域时才做剔除无效测试点处理。
关键词:汽车滑行试验;校正;电机端能量消耗率判据
Abstract: Vehicle driving resistance is usually obtained by taxi test. Accurate road resistance is of great significance to the development of vehicle dynamic economy. In this paper, the processing method of taxiing test data is studied. The wind speed, slope, temperature, pressure and humidity are included in the correction factors to obtain more accurate road resistance coefficient. In this paper, the correction formula is deduced, and a case of one-time correction of all environmental factors is put forward, and the influence degree of each factor correction on the results is obtained. In this paper, the energy consumption rate of motor end under the condition of Chinese working condition is used as the stability criterion of the result. Combined with the test theory, the invalid test points are removed when the group error exceeds 3σ region.
Keywords: Vehicle coast-down test; Correction; Motor end energy consumption rate criterion
前言
汽车的行驶阻力通常由整车滑行试验获取,精确的道路阻力对整车动力性经济性开发有着重要的意义。为了获取更精确的道路阻力,我国对滑行试验的标准做了修改。《GB 18352.6-2016 轻型汽车污染物排放限值及测量方法(中国第六阶段)》[1](以下简称“国六”)附录CC中规定的道路载荷测量与测功机设定方法相对于《GB 18352.5-2013 輕型汽车污染物排放限值及测量方法(中国第五阶段)》[2](以下简称“国五”)附录CH中规定的道路载荷测定方法,有了较大的改进。但在试验数据处理中的校正与拟合,还有待完善的地方。
本文研究滑行试验数据的处理方法,提出将风速、坡度、温度、气压、湿度考虑到了校正的因素中,以获得更精确的道路阻力系数。并提出了各组滑行数据先求出道路阻力系数,后校正系数,并引入中国工况下的轮边平均能量消耗率作为阻力大小和结果稳定性的判据。……
