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胡阳林 《中国汽车保修设备》2004,(8):6-7
在双滚筒式底盘测功机上检测汽车发动机的功率时,由于汽车发动机曲轴输出的功率除去汽车驱动轮功率外,还包括检测中的传动阻功率(传动阻功率包括试验台的机械传动阻力、驱动轮在试验台的滚筒上的滚动阻力以及被检汽车自身传动系的传动阻力所消耗的功率),所以在大多检测中必须分别检测,即汽车发动机曲轴功率Pe为Pe=Pk Pr(1)。 相似文献
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混合动力汽车动力总成试验台研究 总被引:12,自引:2,他引:12
基于混合动力汽车有串联、并联和混联等多种结构形式的特点,提出以模块化设计思想来搭建混合动力汽车动力总成试验台的方法,从而达到了在比较短的时间内、以尽量小的改动适应不同混合动力汽车动力总成结构形式组合需要的目标。根据研究需要,首先完成了混合动力汽车动力总成试验台并联形式的建设,并利用该试验台对所研制的混合动力城市客车多能源动力总成控制器进行了初步调试,验证了该控制器的软硬件设计和并联电动助力型控制策略。同时,所完成的发动机台架试验和电机台架试验也充分证明了试验台模块化设计思想的可行性和有效性。 相似文献
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本文通过对引进的两台发动机测试台架的消化吸收,自行研制设计了完全国产化的发动机试验台,本试验台自动化程度高,造价低,操作维护保养方便,具有通用性,互换性,适应发动机批量生产。 相似文献
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本文介绍国外汽车发动机主要是西欧汽车发动机结构特点以及在对发动机润滑油的热稳定性与清净分散的性的要求,并就我国发动机润滑油如何适应今后国产车及西欧汽车要求提出了一些具体措施。 相似文献
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检测汽车车速表指示误差的试验台。将被测汽车的驱动车轮,置于下图所示的车速表试验台的滚筒上,起动发动机,变速器挂入适当的档位,用驱动车轮带动滚筒旋转,模拟汽车行驶状态。再根据被测汽车的车速表指示值与试验台的测量值(标准值)进行比较,从而得出车速表的指示误差。 相似文献
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针对目前汽车发动机管理系统开发过程中研发成本较高,难度较大的问题,利用仿真的方法,设计并搭建了硬件在环仿真试验台,同时进行了部分试验验证。利用matlab模块化技术,实现快速原型代码生成和硬件在环仿真功能。使用表明,该试验台具备良好的在环仿真功能,能够模拟发动机各种工作工况,为实际试验和产品开发提供仿真依据和参考。 相似文献
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发动机试验台快速联接挠性传动轴的设计 总被引:1,自引:0,他引:1
本文阐述了用于中型汽车发动机试验台的快速联接挠性传动轴的设计与计算。这种传动轴具有良好的试验台通用性能,质量轻,惯量小,对中方便,易于保养维护,更具有独特的安全保护性能,可在汽车行业内推广使用。 相似文献
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阐述了模拟汽车运行工作的发动机动态性能试验台的采样与控制系统。采用两个闭环控制系统完成发动机的负荷调节和测功机的加载,介绍了硬件设计方案与软件的编制原则。最后把试验台测得的结果与道路试验结果进行了对比。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(10):867-887
In this paper a novel active compliance chamber is designed, which can be used to control the dynamic stiffness of a common hydraulic bushing. This chamber offers a simple and cost-effective solution for the variable displacement engine (VDE) isolation problem. A VDE system requires a soft bushing for the half cylinder mode and a regular one for normal engine operations. A magnetic actuator is used to produce mechanical pulses. The linearisation technique is used for simplifying the nonlinear equation of motion. Different current sources are used to feed the magnetic actuator. The pressure inside the chamber follows linearly the current input signal. The phase shift in various current inputs is used in the form of the transfer functions to create the required pressure response pattern in the frequency domain. Since the dynamic stiffness of a conventional hydraulic bushing is a direct function of the pressure inside it, the active compliance chamber can be used to alter the pressure and consequently produce the required dynamic stiffness response. As a result, it can address the engine vibration problem for VDE situation. 相似文献
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Low viscosity engine oil can improve a vehicle’s fuel economy by decreasing the friction between the engine components. Frictional
torque varies with the velocity change due to different viscosity characteristics of SAE grade 5W-20, 5W-30 and 5W-40 engine
oils. The viscosity for each of these grades was measured to outline the effect low viscosity engine oils have on engine friction,
which may lead to improved fuel economy. Engine oil seal frictional torque increases with the shaft rotational speed for all
three engine oil grades. A decrease in engine oil seal frictional torque was confirmed when low viscosity engine oil was used.
Also, the leak-free performance of the engine oil with the seal satisfied the life limit durability test criteria. Thus, low
viscosity engine oil may be used to improve fuel economy by decreasing the frictional loss of the engine oil seal while having
no negative impact on performance due to leak-free functioning. 相似文献
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K. -B. Kim K. -W. Choi K. -H. Lee 《International Journal of Automotive Technology》2012,13(3):401-407
A relatively new approach for improving fuel economy and automotive engine performance involves the use of automotive combined
cycle generation technologies. The combined cycle generation, a process widely used in existing power plants, has become a
viable option for automotive applications due to advances in materials science, nanotechnology, and MEMS (Mico-Electro Mechanical
Systems) devices. The waste heat generated from automotive engine exhaust and coolant is a feasible heat source for a combined
cycle generation system, which is basically a Rankine cycle in the context of this study. However, there are still numerous
technical issues that need to be solved before the technology can be implemented in automobiles. A simulation was performed
to examine the amount of waste energy that could be recovered through the use of a combined cycle system. A simulation model
of the Rankine cycle was developed using Cycle-Tempo software. The simulation model was ultimately used to evaluate the rate
of waste heat recovery and the consequential increase in the overall thermal efficiency of the engine with the combined cycle
generation system under typical engine operating conditions. The most effective automotive combined cycle system recovered
68% of the waste heat from the exhaust and coolant, resulting in a 6% improvement in engine efficiency. The results are expected
to be beneficial for evaluating the feasibility of combined cycle generation systems in automotive applications. 相似文献
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本文提出一种能够实现三维可视化的燃烧室内燃油分布和喷雾着壁特性计算的方法。该方法可适于任意形状的燃烧室,能反映出喷油压力,喷油嘴结构及安装位置,进气涡流比等参数与燃烧室形状的匹配关系。对采用梅花型缩口燃烧室的CA6110型柴油机,进行了计算分析及实验研究,对本文的方法进行了验证。 相似文献