共查询到18条相似文献,搜索用时 707 毫秒
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车用代用燃料研究及发展趋势 总被引:3,自引:0,他引:3
较为详细地介绍了车用代用燃料,即液化石油气(LPG)、压缩天然气(CNG)、醇类燃料、生物燃料、二甲醚(DME)、合成柴油、生物柴油、氢能、电能的物理特性、排放、优缺点、水平现状及发展状况。 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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与传统的车用燃料(汽油和柴油)相比,液化石油气(LPG)具有优良的理化特性,是公认的清洁燃料,LPG汽车在企业的应用是目前所有替代能源汽车中最为广泛的。从最初主要考虑替代能源的第一代技术,到目前呆与最先进的燃油喷射相媲美的,可与OEM配套,适应OBD,具有独立控制策略和燃料成分自适应功能的第四代技术,LPG汽车的相关技术伴随着传统汽车技术的发展、排放标准的日益严格而得到了快速的发展。本文在综合分析了不同阶段的LPG供给系统技术水平,尤其是LPG电控喷射的关键技术,研究了各种系统的优缺点及影响汽车排放特性、动力性和经济性的关键因素,重点介绍了电控喷射系统的相关情况。 相似文献
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本文针对我国目前改装较多的LPG/汽油两用燃料发动机,通过试验分析了燃用LPG的CO、HC、NOx排放及输出转矩随点提前角变化的规律,对LPG/汽油两用燃料发动机燃用LPG时的点火提前角的调整具有一定的指导意义。 相似文献
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改装的LPG/汽油两用燃料汽车的性能如何.很大程度上取决于空燃比与发动机性能的匹配程度。本文通过试验研究了LPG/汽油两用燃料发动机动力性与排放性能随空燃比的变化规律,分析了化油器式汽车改装成燃气汽车所带来的技术问题,对进一步发展LPG/汽油两用燃料汽车技术提出了具体的建议。 相似文献
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双燃料汽车是指具有两套相互独立的燃料供给系统(燃油供给系统和LPG供给系统),两套燃料供给系统都可独立地向发动机供给燃料的汽车。只要做到正确的使用与维护,双燃料汽车运行中使用LPG燃料,具有较高的经济性、可靠的安全性和良好的排放净化效果。 相似文献
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汽油清净剂对发动机排放影响的试验研究 总被引:5,自引:1,他引:5
在M111发动机台架上,采用GB/T 19230.6—2003中所规定的试验方法,研究不同油品对发动机进气阀和燃烧室等部位沉积物的影响,同时用五气分析仪随车检测发动机NOx,CO和HC的排放浓度。结果显示:燃用加清净剂的汽油在减少进气阀积碳的同时增加了燃烧室的积碳;燃用加清净剂的汽油增加了发动机NOx的排放量,对CO排放影响不明显,若燃烧室积碳严重,会加剧HC的排放;因为试验运行时间较短,不同加剂汽油对发动机常规排放物的影响不明显,需进一步进行8×104km~16×104km的行车试验。 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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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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在EQ6100型汽油机上获取最佳EGR率的试验研究 总被引:1,自引:0,他引:1
试验结果表明,在各种负荷工况下,EQ6100型汽油机采用EGR后其NOx排放都显下降,但HC、CO排放及燃油消耗率随EGR率的变化则较为复杂,而因各工况下均存在一个最佳EGR率。通过试验,给出了EQ6100型汽油机2000r/min下最佳EGR率随负荷变化的曲线,为其排气背压控制EGR系统的设计提供了依据。 相似文献
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