风洞法测量汽车道路行驶阻力
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摘要
阐述了风洞法测量汽车行驶阻力的基本原理,并进行了风洞法和道路滑行法的对比测试试验。结果表明,风洞法和道路滑行法测得的汽车行驶阻力数值十分接近,测得的行驶阻力相对偏差在4%以内,循环能量差在±5%以内,证明了风洞法的有效性。不同车速下的CD~*A值差异对行驶阻力的影响极小,风洞法中的等速法与减速法相比,等速法的试验结果更接近道路滑行结果。
The wind tunnel method for vehicle road load measurements had been introduced in this paperand a comparative test of the wind tunnel method and the coast-down method had been conducted. Thetest results show that the road load values measured by the wind tunnel method are very close to thosemeasured by the coast-down method. The relative deviation of the road load is within 4%,the cycle energydifferences are within ±5% and the effectiveness of the wind tunnel method has been proved. The differencein CD~*A values measured at various speeds shows very small impact on the road load. In the wind tunnelmethod, compared with the deceleration procedure,the measurement results obtained by the constant speedprocedure are much closer to the results of coast-down method.
The wind tunnel method for vehicle road load measurements had been introduced in this paperand a comparative test of the wind tunnel method and the coast-down method had been conducted. Thetest results show that the road load values measured by the wind tunnel method are very close to thosemeasured by the coast-down method. The relative deviation of the road load is within 4%,the cycle energydifferences are within ±5% and the effectiveness of the wind tunnel method has been proved. The differencein CD~*A values measured at various speeds shows very small impact on the road load. In the wind tunnelmethod, compared with the deceleration procedure,the measurement results obtained by the constant speedprocedure are much closer to the results of coast-down method.
引文
[1]GB18352.6-2016.轻型汽车污染物排放限值及测量方法(中国第六阶段)[S].北京:中国标准出版社,2016.GB18352.6-2016.Limits and Measurement Methods for Emissions from Light-Duty Vehicles(China 6)[S].Beijing:China Standard Press,2016.(in Chinese)
[2]Global Technical Regulation on Worldwide Harmonized Light Vehicles Test Procedures(WLTP)[Z].2016.
[2]Global Technical Regulation on Worldwide Harmonized Light Vehicles Test Procedures(WLTP)[Z].2016.