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液化石油气汽车燃料供给系统 总被引:2,自引:0,他引:2
介绍液化石油气(LPG)汽车的发展状况及车用液化石油气的技术要求,阐述液化石油气汽车燃料系统的基本组成和结构原理,例举YG6112LPG单燃料发动机系统原理。 相似文献
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本文通过用液化石油气作为汽油机的代用燃料在东风EQ6100发动机上进行试验研究,详细介绍了单燃料系统主要部件的结构特点,发动机台架性能试验与整车道路试验结果。 相似文献
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两用燃料汽车是具有两套相互独立的燃料供给系统。一套供给天然气或液化石油气。另一套供给天然气或液化石油气之外的燃料.两套燃料供给系统可分别但不可共同向气缸供给燃料的汽车。如汽油/压缩天然气两用燃料汽车、汽油/液化石油气两用燃料汽车等。 相似文献
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本就柴油公共汽车改装成柴油-液化石油气双燃料车的试验情况和结果作了介绍,指出改装柴油-液化石油气以燃料后并未改变发动机的结构,且该燃料系统结构简单可靠,有效降低改装和维修成本,虽动力性略有下降,但不影响车辆日常运行。 相似文献
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液化石油气(LPG)较高的蒸汽压力可导致燃油系统高压和低压部分中的燃料蒸发,随之就会导致燃料密度大幅降低而使发动机停机。 相似文献
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LPG(Liquid Petrel Gas)液化石油气汽车是以储存在LPG气瓶内的液态(LPG在0.69MPa压力下为液态,通常LPG气瓶内的压力为1.6MPa)的液化石油气作为燃料,在现成的汽油、柴油车上增加一套LPG燃料供给系统而改装成的“两用燃料汽车”。LPG“两用燃料汽车”可以利用选择开关实现发动机从一种燃料到另一种燃料的转换,两种燃料不允许同时混合使用。 LPG燃料供给系统由LPG气瓶、滤 相似文献
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介绍了一种可用于电喷发动机的LPG改装系统,系统设置了燃料转换开关来控制燃料的转换。该改装系统应用于捷达发动机,测量了发动机分别使用汽油和LPG的输出功率和排放情况,结果表明在燃烧汽油时性能没有变化,使用LPG时动力性稍有下降,排放有明显改善。 相似文献
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汽油车改装成汽油/LPG双燃料车后,由于汽油和LPG的物化性质和燃烧特性有较大的差别,因而使用同一个点火提前角是不合理的。本文以桑 塔纳LX型轿车发动机为对象,通过台 试验得出燃用LPG时的最佳点火提前角,在原车点火系统的基础上,研制出一套能根据不同的燃料自动切换点火提前角的点火装置,该装置在台架和整车道路试验中都获得较好的结果。 相似文献
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对490Q直喷式柴油机进行了LPG/柴油双燃料的技术改造。在分别燃用纯柴油和柴油,LPG双燃料的情况下,研究了相应工况下发动机的动力性、经济性以及排放特性等性能。试验结果表明,加入一定比例的LPG可改变缸内燃烧过程,大幅度降低排气烟度,在一定程度上提高了燃油经济性。 相似文献
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Effect of various LPG supply systems on exhaust particle emission in spark-ignited combustion engine
J. W. Lee H. S. Do S. I. Kweon K. K. Park J. H. Hong 《International Journal of Automotive Technology》2010,11(6):793-800
The particle size distribution and particle number (PN) concentration emitted by internal combustion engine are a subject
of significant environmental concern because of their adverse health effects and environmental impact. This subject has recently
attracted the attention of the Particle Measurement Programme (PMP). In 2007, the UN-ECE GRPE PMP proposed a new method to
measure particle emissions in the diluted exhaust of automotive engines and a regulation limit (<6.0×1011 #/km, number of particles). The specific PN regulation of spark-ignited combustion engine will be regulated starting on September
1, 2014 (EURO 6). In this study, three types of LPG supply systems (a mixer system and a multi-point injection system with
gas-phase or liquid-phase LPG fuel) were used for a comparison of the particulate emission characteristics, including the
nano-sized particle number density. Each of the three LPG vehicles with various LPG injection systems contained a multi-cylinder
engine with same displacement volumes of 2,000 cm3 and a three-way catalytic converter. The test fuel that was used in this study for the spark-ignited combustion engine was
n-butane basis LPG fuel, which is primarily used for taxi vehicles in Korea. The characteristics of nano-particle size distribution
and number concentration of particle sizes ranging from 20 to 1,000 nm (aerodynamic diameter) that were emitted from the three
LPG vehicles with various LPG supply systems were investigated by using a condensation particle counter (CPC), which is recommended
by the PMP under both the NEDC and FTP-75 test modes on a chassis dynamometer. The experimental results indicate that the
PN emission characteristics that were obtained by the CPC system using the PMP procedure are sufficiently reliable compared
to other regulated emissions. Additionally, the sources of PN emissions in ascending order of magnitude are as follows: mixer
type, gas-phase LPG injection (LPGi) and liquid-phase LPG injection (LPLi) passenger vehicles. The liquid-phase LPG injection
system produced relatively large particle sizes and number concentrations compared to the gaseous system, regardless of the
vehicle driving cycle. This phenomenon can be explained by unburned micro-fuel droplets that were generated due to a relatively
short homogeneous fuel-air mixture duration in the engine intake manifold. Also the particle number emissions from the LPG
vehicle were influenced by the vehicle driving cycle. 相似文献
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LPG电控喷射冷起动循环的着火及HC排放影响因素分析 总被引:2,自引:0,他引:2
分析了电喷LPG发动机冷起动过程中影响着火及HC排放的主要因素。试验在一台四冲程、水冷125mL单缸电喷发动机上进行。试验结果表明:LPG发动机冷起动混合气的浓度相当于稳定燃烧混合气浓度的1.5倍左右,比汽油机稀,HC排放也低;随着混合气变稀,首次着火循环逐渐推迟;高起动转速是发动机冷起动可靠的一个主要保障因素;适当提前点火和增大火花塞间隙有利于降低冷起动循环的首次着火循环数;环境温度是影响冷起动过程的一个主要参数。 相似文献
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应用速率敏感度分析法,将LPG发动机复杂的燃烧过程中产生的154种组分进行简化得到22种核心组分,692个反应简化到23个核心反应。应用简化与详细机理对层流火焰传播速度和10种重要组分浓度随时问的变化进行计算对比,并对一4缸LPG发动机的着火延时进行了计算和分析。结果表明在过量空气系数大于1.2的稀燃条件下,应用简化机理对LPG燃烧进行模拟具有较高的精度,完全可以替代详细机理。 相似文献