共查询到19条相似文献,搜索用时 125 毫秒
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汽油机燃油经济性不及柴油机的原因之一是,汽油机在部分负荷工况下通过节气门调节负荷,使得进气管内的压力降低,增加了发动机的泵气损失,而柴油机没有节气;原因之二是,汽油机的过量空气系数比柴油机小,使得热效率降低。因此,除了提高发动机负荷率以外,近年来国外汽车发动机行业还花费了大量的人力物力研究和开发汽油机减少泵气损失的技术和稀薄燃烧技术。笔者将以减少汽油机泵气损失为中 相似文献
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以市售93号乙醇汽油作为试验用油,将一种含有过氧化物的助燃剂M以体积分数1‰添加到乙醇汽油中,在发动机试验台架上考察了该添加剂对乙醇汽油发动机燃油消耗率、缸压和瞬时已燃质量分数(mf)的影响。试验结果表明,在发动机未作任何调整情况下燃用乙醇汽油后,发动机燃油消耗率较原汽油机平均升高4.9%,向乙醇汽油中加入1‰体积分数的添加剂M后发动机燃油消耗率较乙醇汽油机平均下降3.1%。同时,加入该添加剂后发动机缸压峰值较乙醇汽油机有所升高,缸压和mf峰值所对应的发动机曲轴转角提前。 相似文献
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本文介绍了第一汽车制造厂第二代发动机(即CA6102型汽油机和CA6102D型柴油机)的研制过程。首先介绍了发动机的设计依据和目标;其次叙述了二种发动机的结构参数,并着重介绍了CA6102型汽油机的整机总布置和主要零部件的设计方案。经室内试验表明CA6102型汽油机已全面达到设计要求,并已于1983年通过国家鉴定。CA6102D型柴油机的性能指标也达到了设计要求,但尚待进行可靠性试验,工作尚需进一步深入。 相似文献
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由广州汽车集团客车有限公司生产制造的广汽牌GZ6700E1客车选用广汽牌GZ6670DE客车底盘,一汽解放汽车有限公司大连柴油机分公司生产的CA4DC2—12E3柴油发动机,发动机功率为93千瓦,最高车速可达120公里/小时。 相似文献
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我国车用汽油发动机市场在经过了两年的高速增长之后,2008年以来产销增速有放缓的趋势。2008年1-2月份,合资品牌在汽油机总产销量中所占份额继续增加,汽油机在发动机总产销量中所占比重继续下降,柴油机所占份额有所增加。 相似文献
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文章介绍了2010年上半年中国车用汽油机市场发展概况,分析了汽油、柴油机增长贡献度,不同排量汽油机产量增长情况。文章还介绍了产量位居行业前10名的企业的产销情况,增长因素,拉动增长的主要机型。对2010年上半年中国车用汽油机市场发展特点进行了分析,并且介绍了一些主要新机型,并对2010年下半年及全年产销进行了展望。 相似文献
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汽车发动机在节能和排放领域的新进展 总被引:4,自引:0,他引:4
回顾 内燃机的发展历程,并对为降低内燃机排放而采取各种动力的汽车进行分析,指出燃油汽车仍具有很大的发展前景,论述了汽油机从化油器式直至均燃直喷式的发展历程,并阐述了它们各自的优缺点;指出了柴油机为达到提高功率密度、降低燃油消耗及改善环境的目的应采取的措施。 相似文献
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This paper is review of the characterization of exhaust particles from state-of-the-art internal combustion engines. We primarily focus on identifying the physical and chemical properties of nano-particles, i.e., the concentration, size distribution, and particulate matter (PM) morphology. Stringent emissions regulations of the Euro 6 and the LEV III require a substantial reduction in the PM emissions from vehicles, and improvements in human health effects. Advances in powertrains with sophisticated engine control strategies and engine after-treatment technologies have significantly improved PM emission levels, motivating the development of new particle measurement instruments and chemical analysis procedures. In this paper, recent research trends are reviewed for physical and chemical PM characterization methods for gasoline and diesel fueled engines under various vehicle certification cycles and real-world driving conditions. The effects of engine technologies, fuels, and engine lubricant oils on exhaust PM morphology and compositions are also discussed. 相似文献
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汽车运行材料的应用现状及发展趋势 总被引:1,自引:0,他引:1
综述了汽车用燃料(汽油、柴油、代用燃料)、润滑剂(发动机润滑油、齿轮油、自动变速器油、润滑脂)、特种液(制动液、冷却液、空调制冷剂)、燃料添加剂及润滑剂添加剂等运行材料在国内外的应用现状及发展趋势。该研究可为汽车运行材料的新产品研发提供参考。 相似文献
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J. W. Lee Y. I. Jeong M. W. Jung K. O. Cha S. I. Kwon J. C. Kim S. Park 《International Journal of Automotive Technology》2008,9(4):397-403
In recent years, particle number emissions rather than particulate mass emissions in automotive engines have become the subject
with controversial discussions. Recent results from studies of health effects imply that it is possible that particulate mass
does not properly correlate with the variety of health effects attributed to engine exhaust. The concern is now focusing on
nano-sized particles emitted from I. C. engines. In this study, particulate mass and particle number concentration emitted
from light-duty vehicles were investigated for a better understanding of the characteristics of the engine PM from different
types of fuels, such as gasoline and diesel fuel. Engine nano-particle mass and size distributions of four test vehicles were
measured by a condensation particle counter system, which is recommended by the particle measurement program in Europe (PMP),
at the end of a dilution tunnel along a NEDC test mode on a chassis dynamometer. We found that particle number concentrations
of diesel passenger vehicles with DPF system are lower than gasoline passenger vehicles, but PM mass has some similar values.
However, in diesel vehicles with DPF system, PM mass and particle number concentrations were greatly influenced by PM regeneration.
Particle emissions in light-duty vehicles emitted about 90% at the ECE15 cycle in NEDC test mode, regardless of vehicle fuel
type. Particle emissions at the early cold condition of engine were highly emitted in the test mode. 相似文献
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This paper reviews the particle emissions formed during the combustion process in spark ignition and diesel engine. Proposed
legislation in Europe and California will impose a particle number requirement for GDI (gasoline direct injection) vehicles
and will introduce the Euro 6 and LEV-III emission standards. More careful optimization for reducing particulate emission
on engine hardware, fuel system, and control strategy to reduce particulate emissions will be required during cold start and
warm-up phases. Because The diesel combustion inherently produces significant amounts of PM as a result of incomplete combustion
around individual fuel droplets in the combustion zone, much attention has been paid to reducing particle emissions through
electronic engine control, high pressure injection systems, combustion chamber design, and exhaust after-treatment technologies.
In this paper, recent research and development trends to reduce the particle emissions from internal combustion engines are
summarized, with a focus on PMP activity in EU, CARB and SAE papers and including both state-of-the-art light-duty vehicles
and heavy-duty engines. 相似文献
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为了改善汽油HCCI发动机在低负荷的失火,通过在90号汽油中添加不同种类和不同质量的过氧化物,在一台改造过的4缸柴油机的第4缸进行HCCI燃烧试验,研究了添加剂对HCCI燃烧过程的影响。试验结果表明,在发动机转速为1 400 r/min时,使用90号汽油的HCCI发动机只能在高负荷下运行;加入过氧化物添加剂后,着火时刻提前、缸压和放热率峰值升高,燃烧向低负荷区域大幅度拓展;添加相同质量分数的不同种类过氧化物,二叔丁基过氧化物(DTBP)作用最明显。相同当量比的稳态工况下,随二叔丁基过氧化物质量分数增加,着火和燃烧放热提前、燃烧持续期缩短,失火得到有效改善,负荷范围得到拓宽。但过高的添加剂质量分数会使发动机高负荷爆震可能性增加,发动机转速为1 400 r/min下,二叔丁基过氧化物的质量分数2%左右为最佳值。 相似文献