共查询到20条相似文献,搜索用时 125 毫秒
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本文介绍了ZS1115型单缸柴油机进行排放性能改进中使用的技术措施.通过改善进气涡流比、改进燃烧室形状、延迟供油定时、提高供油速率等改进措施,并进行优化匹配,降低了各项柴油机的排放,使该机型达到欧I排放标准. 相似文献
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为满足国家新的三轮汽车和低速货车尾气排放法规要求,山东华源莱动内燃机有限公司对自行开发的1115型柴油机的供油系统、燃烧室、凸轮轴等作了改进,这些改进措施有效地改善了柴油机的排放,本文论述了这些改进措施的效果及它对柴油机性能的影响。 相似文献
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本文主要对东风康明斯B系列柴油机如何降低发动机尾气排放进行了研究。为了满足日益严格的排放法规,东风公司对B系列柴油机的燃烧系统和供油系统等作了改进,运些改进措施有效地改善了发动机的尾气排放。文章也简要地对今后满足欧Ⅱ、欧Ⅲ排放标准进行了探讨和研究。 相似文献
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满足欧Ⅲ排放标准柴油机压缩比和供油提前角优化计算 总被引:1,自引:0,他引:1
采用AVL BOOST性能预测软件对4100直喷式柴油机建立起工作过程计算模型,并进行了总功率试验,通过发动机的速度特性验证了模型的准确性.还具体分析了压缩比和供油提前角等主要参数对整机性能的影响,确定了合理的压缩比和供油提前角.根据优化后的压缩比和供油提前角对原机进行调整和试验,并对改进前后柴油机的性能进行比较,结果表明:改进后的柴油机油耗率比原机稍高一些,但动力性有所提高,排放大大降低,达到了开发低排放柴油机的目的,大大减少开发过程中的人力、物力和财力. 相似文献
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熊飞 《小型内燃机与摩托车》2011,40(5):55-59,88
利用机内净化技术对某增压中冷柴油机进行国Ⅲ开发的排放试验研究。技术措施包括:采用更高喷射压力机械喷油泵、小孔径无压力室喷油器、降低机油消耗率等改进方案优化柴油机燃烧,降低颗粒(PM)排放;通过推迟供油提前角、废气再循环技术,降低氮氧化物(NOx)排放。试验表明,综合实施以上方案,柴油机能够满足国Ⅲ排放法规限值要求,具有良好的市场应用前景。 相似文献
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NOx排放是直喷式柴油机排放中最受关注的部分,且它的降低,需要从改善供油系统、进气系统、燃烧系统方面着的。同时,还必须保持发动机良好的燃油经济性。本文对CA6110/125ZWA增压中冷(水空)柴油机降低NOx排放试验过程中所采取的多种试验方案、改进措施及试验结果进行了介绍。 相似文献
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以一台四缸非道路移动机械用柴油机为试验发动机,在喷油提前角为3℃A、1℃A和-1℃A条件下,对发动机的外特性、经济特性以及排放特性进行了研究。研究表明:喷油提前角的推迟,对发动机动力性影响不大;但对柴油机的经济性影响比较大,尤其是发动机运行在中高转速时;喷油提前角对排放也有较大影响,随着喷油提前角的推迟,CO和HC排放增加,NOx排放得到一定程度的改善;喷油提前角3℃A下的八工况点比排放得到大幅改善。因此,通过调整喷油提前角可使该非道路用柴油机达到拟国3排放法规的要求。 相似文献
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喷油定时对柴油机经济性和排放的影响 总被引:1,自引:0,他引:1
李伟军 《柴油机设计与制造》2004,(2):42-45
燃油喷射装置是柴油机的一个重要组成部分,燃油系统喷油定时对柴油机的性能、烟度、排放、噪音起着至关重要的影响。对比试验不同的喷油定时对柴油机的油耗和排放的影响,并分析如何选择喷油定时使柴油机获得良好的性能。 相似文献
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现代车用柴油机电控共轨喷射技术综述 总被引:1,自引:0,他引:1
杨忠敏 《柴油机设计与制造》2005,14(1):5-7
阐述了现代车用柴油机电控共轨喷射系统的发展目的、意义和现状。电控共轨喷射系统无论从降低车用柴油机排放和噪声,还是提高车用柴油机的动力性和经济性都具有很大优势,随着排放法规日趋严格,对动力性,经济性和驾驶性要求越来越高,共轨式电喷射技术必将是今后现代车用柴油机发展趋势 相似文献
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《Energy》2005,30(2-4):447-459
This paper focuses on the effects of early stage injection and two-stage injection on the combustion characteristics and engine performances of an indirect injection (IDI) diesel engine. In a direct injection (DI) diesel engine, HC emission increases with early stage injection because some of the fuel spray adheres to the cylinder wall and burns in the gap between the piston and the cylinder. On the other hand, since the fuel spray of early stage injection in an IDI diesel engine is injected into an auxiliary combustion chamber such as a swirl chamber, the IDI diesel engine could reduced the HC emission produced from the gap compared with a DI diesel engine. In a two-stage injection IDI diesel engine, NO and smoke emissions are improved when the amount of fuel in the first stage injection is small and the first stage injection timing is advanced over −80° TDC. And 20% improvement in fuel consumption is achieved when the first stage injection timing is advanced over −80° TDC. Conversely, HC and CO emissions of two-stage injection increases compared with that of conventional injection of an IDI diesel engine. However, CO emission can be improved a little when the first stage injection timing is advanced over −100° TDC and the second stage injection timing is retarded over TDC. 相似文献
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喷油系统参数对重型车用增压直喷柴油机NOx排放的影响 总被引:2,自引:0,他引:2
本文针对一台重型车用增压中冷电控直喷式柴油机,试验研究了喷油系统参数如喷孔直径、喷孔锥角、喷油压力、喷油定时等对NO_x排放和排气烟度的影响,指出了通过它们的优化匹配,改善柴油机排放特性的途径。 相似文献
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Natural gas (NG) is one of the most important and successful alternative fuels for vehicles. Engine combustion and emission fuelled with natural gas have been reviewed by NG/gasoline bi-fuel engine, pure NG engine, NG/diesel dual fuel engine and HCNG engine. Compared to using gasoline, bi-fuel engine using NG exhibits higher thermal efficiency; produces lower HC, CO and PM emissions and higher NOx emission. The bi-fuel mode can not fully exert the advantages of NG. Optimization of structure design for engine chamber, injection parameters including injection timing, injection pressure and multi injection, and lean burn provides a technological route to achieve high efficiency, low emissions and balance between HC and NOx. Compared to diesel, NG/diesel dual fuel engine exhibits longer ignition delay; has lower thermal efficiency at low and partial loads and higher at medium and high loads; emits higher HC and CO emissions and lower PM and NOx emissions. The addition of hydrogen can further improve the thermal efficiency and decrease the HC, CO and PM emissions of NG engine, while significantly increase the NOx emission. In each mode, methane is the major composition of THC emission and it has great warming potential. Methane emission can be decreased by hydrogen addition and after-treatment technology. 相似文献
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