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电控汽油喷射能有效地改善发动机的动力性、经济性以及排放指标,因而目前在国外已得到了广泛的应用,但在国内尚处于开始应用阶段,对电控汽油喷射发动机的感性认识较少。因此本文首先以试验研究为手段,充分显示出电控汽油喷射的优越性,然后从理论上分析电控汽油喷射改善发动机性能的因素和潜力。 相似文献
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电控汽油喷射能效地改善发动机的动力性、经济性以及排放指标,因而目前在国外已得到了广泛的应用,但在国内尚处于开始应用阶段,对电控汽油喷射发动机的感性认识较少。因此本文首先以试验研究为手段,充分显示出电控汽油喷射的优越性,然后从理论上分析电控汽油喷射改善发动机性能的因素和潜力。 相似文献
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电控单点汽油喷射系统应用于492Q系列发动机中的研究 总被引:1,自引:0,他引:1
本文首先研究了影响电控单点汽油喷射发动机性能的因素以及循环供油量的优化。然后,对492Q系列发动机的两种机型进行了电控,它们是BJ492Q和SY492Q-4型汽油机。结果表明:电控单点汽油喷射能有效地改善现有的492Q系列发动机,并使其性能得到提高。最后,从理论上来探讨汽油喷射改善发动机性能的机理。 相似文献
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采用激光全息技术对电控多点汽油喷嘴喷雾特性的实验研究 总被引:2,自引:0,他引:2
利用激光全息技术对电控多点汽油喷嘴的喷雾特性进行了研究,介绍了用于汽油喷雾场研究的双脉冲激光全息摄影装置以及喷油和触发的控制系统,使用系统研究了GM和OSCH公司生产的两种不同型号喷嘴的喷雾特性,同时发现了漂流,滴油断续喷射等不正常喷射,实验表明,该系统能有效地评定电位喷嘴的微观性能,为电控汽油喷射发动机改善性能提供依据。 相似文献
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本文在总结汽车发动机电控汽油喷射原理的基础上,针对小排量汽油机的特点和要求,研究开发了适合小排量汽油机的电控汽油喷射系统,对该系统的构成细节和特点进行了详细的描述,并给出了在排量为125mL的2缸四冲程摩托车发动机上的试验结果。与使用化油器相比,使用电控汽油喷射技术可以较大幅度的改善发动机的尾气排放,在不使用排气后处理装置的情况下,使其达到欧洲Ⅱ排放标准,发动机的经济性、低速扭矩特性有明显的改善,动力性比原来略有改善。本文还对如何进一步完善摩托车电控燃油喷射系统提出一些建议。 相似文献
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本文简要介绍电控汽洞 国内外的发展及其系统的组成,并进行了用电控汽油喷射技术改造国产发动机的试验。 相似文献
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The use of jojoba methyl ester as a pilot fuel was investigated for almost the first time as a way to improve the performance of dual fuel engine running on natural gas or liquefied petroleum gas (LPG) at part load. The dual fuel engine used was Ricardo E6 variable compression diesel engine and it used either compressed natural gas (CNG) or LPG as the main fuel and jojoba methyl ester as a pilot fuel. Diesel fuel was used as a reference fuel for the dual fuel engine results. During the experimental tests, the following have been measured: engine efficiency in terms of specific fuel consumption, brake power output, combustion noise in terms of maximum pressure rise rate and maximum pressure, exhaust emissions in terms of carbon monoxide and hydrocarbons, knocking limits in terms of maximum torque at onset of knocking, and cyclic variability data of 100 engine cycles in terms of maximum pressure and its pressure rise rate average and standard deviation. The tests examined the following engine parameters: gaseous fuel type, engine speed and load, pilot fuel injection timing, pilot fuel mass and compression ratio. Results showed that using the jojoba fuel with its improved properties has improved the dual fuel engine performance, reduced the combustion noise, extended knocking limits and reduced the cyclic variability of the combustion. 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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《International Journal of Hydrogen Energy》2020,45(8):5577-5587
In the present work, dual fuel operation of a diesel engine has been experimentally investigated using biodiesel and hydrogen as the test fuels. Jatropha Curcas biodiesel is used as the pilot fuel, which is directly injected in the combustion chamber using conventional diesel injector. The main fuel (hydrogen) is injected in the intake manifold using a hydrogen injector and electronic control unit. In dual fuel mode, engine operations are studied at varying engine loads at the maximum pilot fuel substitution conditions. The engine performance parameters such as maximum pilot fuel substitution, brake thermal efficiency and brake specific energy consumption are investigated. On emission side, oxides of nitrogen, hydrocarbon, carbon monoxide and smoke emissions are analysed. Based on the results, it is found that biodiesel-hydrogen dual fuel engine could utilize up to 80.7% and 24.5% hydrogen (by energy share) at low and high loads respectively along with improved brake thermal efficiency. Furthermore, hydrocarbon, carbon monoxide and smoke emissions are significantly reduced compared to single fuel diesel engine operation. Exhaust gas recirculation (EGR) has also been studied with biodiesel-hydrogen dual fuel engine operations. It is found that EGR could improve the utilization of hydrogen in dual fuel engine, especially at the high loads. The effect of EGR is also found to reduce high nitrogen oxide emissions from the dual fuel engine and brake thermal efficiency is not significantly affected. 相似文献
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以4102型柴油机为基础机,开发天然气/柴油双燃料发动机,试验研究引燃油量、喷油提前角对发动机排放和经济性影响,以及双燃料发动机与原柴油机性能和排放的比较。 相似文献
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An investigation on the ignition delay of a dual fuel engine operating with methanol ignited by pilot diesel was conducted on a TY1100 direct-injection diesel engine equipped with an electronic controlled methanol low-pressure injection system. The experimental results show that the polytropic index of compression process of the dual fuel engine decreases linearly while the ignition delay increases with the increase in methanol mass fraction. Compared with the conventional diesel engine, the ignition delay increment of the dual fuel engine is about 1.5° at a methanol mass fraction of 62%, an engine speed of 1600 r/min, and full engine load. With the elevation of the intake charge temperature from 20°C to 40°C and then to 60°C, the ignition delay of the dual fuel engine decreases and is more obvious at high temperature. Moreover, with the increase in engine speed, the ignition delay of the dual fuel engine by time scale (ms) decreases clearly under all engine operating conditions. However, the ignition delay of the dual fuel engine increases remarkably by advancing the delivery timing of pilot diesel, especially at light engine loads. 相似文献
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在D6114ZLQB车用增压柴油机上比较研究了不同比例的菜籽油甲酯和0号柴油的混合燃料对发动机燃烧过程、燃油经济性和排放特性的影响。试验结果表明:燃用体积比低于15%的菜籽油甲酯,发动机的缸内燃烧过程和纯柴油基本一致;增压柴油机燃用菜籽油甲酯和柴油的混合燃料可以有效降低碳烟、HC和CO的排放;NOx排放略有上升;15%以内的菜籽油甲酯对柴油机燃料经济性影响很小。研究认为:增压柴油机相对自然吸气式柴油机具有更好的生物柴油燃料适应性;在不改变发动机参数的条件下,低比例的菜籽油甲酯具有良好的推广应用前景。 相似文献