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71.
本文从多个角度入手,以提高汽油机性能为主要目的,进行了多次试验并吸收了前人的设计经验。着重分析了配气机凸轮高速结构的改进方法及提升性能的效果,整合了多组的数据来证实。还分析了汽油机汽缸的本身在提升其性能上的可能性,阐述了汽油机仍具有提升和改进的前景。 相似文献
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本文阐述了汽油机排放污染物的主要成分及其危害、排放污染物的浓度影响因素以及国内外汽油机常见排污控制技术。 相似文献
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以LabVIEW高效虚拟仪器开发平台和高速数据采集技术为基础,开发了集采集、分析与控制一体化的电控点火系统.该系统主要由点火控制、数据采集二部分组成,已成功应用于点火室直喷汽油机的点火控制和缸压采集实验中.实验结果表明,本系统可以精准地控制发动机点火,可以实现在线修改点火提前角和点火线圈充电时间,为发动机的设计和进一步优化提供有力支持. 相似文献
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当车辆在低中速运行时,通过闭缸技术使工作缸负荷提高,让发动机工作在燃油经济区,降低发动机燃油的消耗。 相似文献
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近年来,无论是传统的汽油机,还是燃用代用燃料的新型发动机,都在寻求通过将燃料直接喷入缸内改善发动机的性能,使发电机具有更高的燃油经济性和排放水平。 相似文献
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研制了冷却系统,进行发动机低水温台架试验。通过分析发动机稳定工况大循环冷却系统的传热,获得保持箱内水温不变就能使冷却水温稳定的控制原理及其冷却水排泄量计算方法。系统用旁通阀手动排泄经测算的部分进箱冷却水,用浮球阀向箱内自动补充等于排泄量的冷水,控制箱内水温稳定,并进行台架试验与性能分析。结果表明,在测试过程中发动机在转速3 000 r/min各冷却水温控制精度≤±0.2℃,试验取得的数据准确。所研制的冷却系统运行可靠,实用性强,实现在40~95℃的任一冷却水温控制,满足试验要求,且拓展发动机台架功能。 相似文献
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Effects of exhaust gas recirculation ( EGR) on homogeneous charge combustion of n-heptane was studied through simulation and experiment. Experiments were carried out in a single cylinder, four-stroke, air cooled engine and a single cylinder, two-stroke, water cooled engine. In the four-stroke engine, experiments of the effects of EGR were examined using heated N2 addition as a surrogate for external EGR and modifying engine to increase internal EGR. The ignition timing was sensitive to EGR due to thermal and chemical effects. EGR or extra air is a key factor in eliminating knock during mid-load conditions. For higher load operation the only way to avoid knock is to control reaction timing through the use of spark ignition. Experimental and modeling results from the twostroke engine show that auto-ignition can be avoided by increasing the engine speed. The twostroke engine experiments indicate that high levels of internal EGR can enable spark ignition at lean conditions. At higher load conditions, increasing the engine speed is an effective method to control transition from homogeneous charge compression ignition ( HCCI) operation to non-HCCI operation and successful spark ignition of a highly dilute mixture can avoid serious knock. 相似文献