基于单滚筒底盘测功机的汽车传动效率测试方法研究

发布时间：2018-07-06 13:39

本文选题：单滚筒底盘测功机 + 汽车传动效率　；参考：《华东交通大学》2016年硕士论文

【摘要】：根据中国汽车工业协会最新统计数据显示:2015年,我国汽车产销量分别突破2450万和2459万辆,中国汽车保有量达到1.72亿辆,与此同时汽车尾气排放对我国空气环境污染也产生重要的影响。汽车传动系统是指位于汽车发动机和驱动轮之间的动力传递装置,汽车传递系统功率损失是汽车传动系统的一个重要性能指标,对于汽车的动力性和燃油经济性均有重要的影响。目前国内外学者对于汽车传动系统的研究多局限于汽车传动系统的性能匹配性上,将其取为固定值,而鲜有关于汽车传动效率变化对汽车动力性和燃油经济性影响方面的研究。本文以AVL Roadsim型48英寸单滚筒底盘测功机为试验平台,以江铃宝典2007款为试验车辆,采用正向加载试验和反拖试验相结合的方法,在免拆卸状态下检测出汽车传动系统的功率和发动机输出功率,从而准确的计算出汽车的传动效率。具体的研究内容和结果如下所示:(1)基于汽车在道路上行驶时存在的各种行驶阻力分析的基础上,结合力与功率的关系,建立了汽车在道路行驶时的发动机功率损失数学模型。(2)基于单滚筒底盘测功机的工作原理分析研究的基础上,对比汽车在道路行驶时的功率损失模型,建立了汽车在单滚筒底盘测功机试验时汽车发动机功率损失数学模型。(3)基于汽车在底盘测功机上试验时的功率损失数学模型,采用正向加载试验和反拖试验相结合的方法,提出一种在整车不拆卸状态下测量汽车发动机对外输出功率的方法。(4)单滚筒底盘测功机自身存在寄生阻力功率损失,本文采用单滚筒底盘测功机在空载状态下从高速向低速自由滑行的方法,测量出单滚筒底盘测功机自身寄生阻力和寄生阻力功率损失。并在反拖试验时通过计算机控制系统对反向加载功率进行补偿,从而提高了汽车发动机对外输出功率的精确性。(5)基于单滚筒底盘测功机试验平台,在分别测量出汽车发动机对外输出功率和汽车驱动轮功率的基础上,计算出汽车传动效率。(6)试验数据结果表明:在直接档(3档)情况下,汽车在20-40km/h速度区间时,汽车传动效率整体上随车速增大而逐渐增加且传动效率均在92%以上;在40-80km/h速度区间时,汽车传动效率随车速的增大而缓慢降低,但传动效率仍均在90%以上;当速度超过80km/h以后,汽车传动效率急剧降低。
[Abstract]:According to the latest statistics of the China Association of Automobile Manufacturers, in 2015, China's auto production and sales volume exceeded 2450 million and 24.59 million respectively, and the number of Chinese cars held reached 172 million. At the same time, automobile exhaust emissions also have an important impact on air pollution in China. The automobile transmission system refers to the power transmission device between the automobile engine and the drive wheel. The power loss of the automobile transmission system is an important performance index of the automobile transmission system. It has an important effect on the power performance and fuel economy of the vehicle. At present, scholars at home and abroad mostly focus on the performance matching of automobile transmission system, and take it as a fixed value. However, there is little research on the effect of vehicle transmission efficiency change on vehicle power performance and fuel economy. Taking AVL Roadsim 48-inch single drum chassis dynamometer as test platform and Jiangling Baodian 2007 as test vehicle, the method of combining forward loading test and reverse towing test is adopted in this paper. The power of the transmission system and the output power of the engine are detected under the condition of no disassembly, and the transmission efficiency of the vehicle is calculated accurately. The specific research contents and results are as follows: (1) based on the analysis of all kinds of driving resistance, the relationship between adhesion and power is discussed. The mathematical model of engine power loss in road driving is established. (2) based on the analysis and study of the working principle of single drum chassis dynamometer, the power loss model of automobile is compared when driving on the road. The mathematical model of power loss of automobile engine in the test of single drum chassis dynamometer is established. (3) based on the mathematical model of power loss of automobile in chassis dynamometer test, the method of combining forward loading test and reverse towing test is adopted. A method for measuring the output power of automobile engine without disassembly is proposed. (4) the single drum chassis dynamometer itself has parasitic resistance power loss. In this paper, the single drum chassis dynamometer is used to measure the parasitic resistance and the parasitic resistance power loss of the single drum chassis dynamometer from high speed to low speed free gliding under the condition of no load. The reverse load power is compensated by the computer control system in the reverse towing test, which improves the accuracy of the output power of the automobile engine. (5) based on the test platform of the single drum chassis dynamometer, On the basis of measuring the external output power and driving wheel power of automobile engine, the transmission efficiency of the vehicle is calculated. (6) the test data show that the vehicle is in the 20-40km/h speed range in the case of direct gear (3 gears). As a whole, the transmission efficiency increases gradually with the increase of the speed and the transmission efficiency is above 92%. In the 40-80km/h speed range, the transmission efficiency decreases slowly with the increase of the speed, but the transmission efficiency is still above 90%. When the speed exceeds the 80km/h, the transmission efficiency of the vehicle is more than 90%. The efficiency of automobile transmission has been sharply reduced.
【学位授予单位】：华东交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U467.4

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