共查询到20条相似文献,搜索用时 31 毫秒
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汽车发动机无负荷测功原理及应用 总被引:5,自引:0,他引:5
和使用水力测功器或电力测功器的带负荷测功法相比,无负荷测功法的测量精度较低,但由于它具有操作简便、价格低廉等优点,因此仍然是汽车维修厂家广泛采用的一种测量手段。重点介绍了无负荷加速时间法和功率平衡法的原理及应用。 相似文献
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排放试验用底盘测功机的设定研究 总被引:4,自引:1,他引:4
根据汽车在道路上和底盘测功机上运行时的受力分析结果,提出了底盘测功机设定原则和负荷设定方法,举例分析了底盘测功机上各种负荷设定方法,并综述欧、日、美排放法规有关底盘测功机的一些规定。 相似文献
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D. Garcia-Pozuelo V. Diaz M. J. L. Boada 《International Journal of Automotive Technology》2014,15(4):553-564
Most of the tyre models have been developed for high speed, combined forces, etc., however, in certain tests it is necessary to know tyre behaviour at very low speed in order to evaluate different systems. So, during vehicle inspection and maintenance of the steering and brake system, by means of sideslip tester and roller brake tester respectively, the forces transmitted by the tyres are measured; all of these inspections are carried out at low speeds. Furthermore, usually, automobile vehicles run at low speeds during an important part of their operating life (less than 60 km/h), mainly during urban traffic, and in steady state conditions. Therefore, it is particularly interesting to develop an accurate model of the contact patch tyrepavement for low speeds without the complexity of models that cover a wide speed range but provide less precision at very low speeds. The dynamometer plate has proved to be an appropriate test equipment to characterise the tyre-pavement contact at low speed and the steering geometry and wheel alignment. It has the feature of being able to carry out tests with the tyre installed in the vehicle as in completely real conditions. The main aim of this research is to set up a contact model between tyre and pavement at very low speed based on the measurement of longitudinal and lateral forces. A test methodology that allows carrying out the experimental tests in a systematic and controlled way with the dynamometer plate has also been developed. From this model it will be possible to estimate the forces that tyres are capable of transmitting in different situations to act in the parameters which affect these forces and maximize them. 相似文献
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分析纯电动车高压部件与车身之间存在高电压的原因,阐述用万用表检测高压部件对车身的电压存在干扰的原因,指出通过双万用表法测量可消除这种干扰,并对这种现象进行实物模型验证。 相似文献
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在介绍负荷拖车和交流电力测功机工作原理的基础上,通过深入分析交流电力测功机恒转矩变频调速和恒功率变频调速两个转速工作区域的工作特性,提出了交流电力测功机在负荷拖车上的应用特点. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(4):261-285
For purpose of simulation of vehicle dynamics, a physical model of an automotive shock absorber has been developed and implemented in several software packages for multibody simulations. In the present paper, the damper model structure is shortly elaborated together with some measurement and estimation techniques to retrieve the model parameters, possibly from dynamometer measurements only. These techniques are illustrated on a shock absorber normally used on the front suspension of a BMW series 7. 相似文献
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Simulation Tools, Modelling and Identification, for an Automotive Shock Absorber in the Context of Vehicle Dynamics 总被引:9,自引:0,他引:9
Stefaan W. R. Duym 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2000,33(4):261-285
For purpose of simulation of vehicle dynamics, a physical model of an automotive shock absorber has been developed and implemented in several software packages for multibody simulations. In the present paper, the damper model structure is shortly elaborated together with some measurement and estimation techniques to retrieve the model parameters, possibly from dynamometer measurements only. These techniques are illustrated on a shock absorber normally used on the front suspension of a BMW series 7. 相似文献
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基于国内乘用车排放试验室现状,根据《测量不确定度评定与表示》(JJF 1059—1999)中对不确定度的定义和评定要求,将尾气排放测试系统、底盘测功机等仪器和设备、环境条件、标准物质、试验操作等影响测量结果的不确度用于评定汽车燃油消耗量测量精度,通过计算得到了碳平衡法油耗测试结果的扩展不确定度,且表明了该结果的置信范围和程度。 相似文献
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