车用LPG气瓶的安全性设计

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     

液化石油气汽车技术的发展与应用

介绍了液化石油气(LPG)汽车改装技术及发展状况,分析了其性能特点和排放效果,提出了加快我国LPG电控喷射技术发展的必要性。在LPGV技术的发展中,首先,介绍了车用LPG混合气系统(第一代)。其次,介绍了电子控制车用LPG气化器系统(第二代)。最后,介绍了车用LPG电控喷射系统(第三代)。     

富康电喷双燃料车的LPG系统

富康电喷双燃料车的型号为DC7141RDC,是在原有1.4L TU3JP/K发动机上加装LPG(石油燃化气)系统而成。该车既可与改装前一样使用汽油燃油,又可使用石油液化气LPG,具有明显的节油和环保效益,深受出租车驾驶员的欢迎。本文将详细介绍该车的LPG系统,供维修人员检修LPG系统时参考。LPG     

液化石油气汽车试验研究

本文介绍了液化石油气（LPG）汽车的情况、车用LPG的特性与优点，三种车用LPG系统和我国LPG汽车的技术水平，对我国LPG汽车的性能试验结果进行了分析，探讨了目前我国LPG汽车存在的问题，并提出了几点建议。     

在用LPG汽车检测规范的研究

简述了我国LPG汽车标准体系现状,分析了在用LPG汽车检测规范方面的不足,提出LPG汽车专用装置检测项目和检测规范。随机选择了10辆LPG汽车样本,进行了双怠速排放性能、LPG钢瓶的合格性、燃气供给系统外观与泄漏性能检测,验证了检测项目的合理性与可行性。     

汽油/LPG两用燃料发动机性能试验研究

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。     

LPG发动机电控系统设计及试验研究

设计了LPG发动机电控系统,制订了LPG发动机基本控制策略,通过试验对比了LPG发动机和汽油机的各项性能。试验结果表明:LPG发动机在动力性上相对汽油机有3.5%左右的下降,但经济性提高了大约4%;CO和HC排放均有明显降低,NOx排放略有降低。     

液化石油气汽车燃料供给系统

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。     

液态喷射式LPG系统简介

电喷发动机上使用的闭环控制液化石油气装置从供气方式上可分为混合器式，气态喷射式和液态喷射式，液态喷射式LPG装置也称为LPI系统。介绍了LPI系统的工作过程，保持液态LPG的方式及其电子控制方式，由于采用兴态喷射，与混合器式和气态喷射式LPG系统相比，具有响应时间快，喷射精确及时及不占用空气进气体积等特点。     

LPG摩托车燃气供给系统设计及性能试验研究

应用文丘里原理，开发了LPG燃气供给系统，对LH139燃油发动机进行燃用LPG的改装，并进行了整车试验。结果表明，采用该装置的LPG摩托车，其动力性、经济性及排放指标和耐久性均优于原型车。     

LPG出租车简易瞬态工况排放特性研究

以LPG出租车为研究对象,在简易瞬态工况下测试LPG车辆的单车排放因子,对比分析了LPG车和汽油车的排放特性,研究了LPG原装车与改装车的排放差异,比较了几种不同车型的排放因子,研究了LPG出租车单车排放因子与行驶里程的关系。结果表明,与汽油车相比,LPG出租车CO排放降低至少48%,NOx排放降低至少62%;原装LPG出租车排放比改装车排放降低明显;LPG出租车的排放因子随车辆行驶里程的增加呈上升趋势。     

掺烧LPG对直喷式柴油机性能的影响

提出一种柴油机混合燃用LPG的新方式,即LPG/柴油混合喷射方式。分析了不同LPG质量掺混比对发动机热效率、排放特性和燃烧特性的影响。试验结果表明,LPG掺混比较小时,可以改善发动机的热效率;掺混比较大时,烟度和NO_x排放大幅降低,平均有效压力较高时CO排放也有所降低,HC略有升高;LPG混入柴油中对发动机燃烧特性也有显著影响。     

Effect of cetane enhancer on spray and combustion characteristics of compressed ignition type LPG fuel

This research investigated the spray and combustion characteristics of compressed ignition type LPG fuel when a cetane number enhancing additive was applied to a constant volume chamber. Because LPG has a lower cetane number, DTBP and alpha olefin were added to the LPG (100% butane) to enhance the cetane number and viscosity. By adding the cetane enhancer, stable combustion over the wide range of the ambient conditions was possible as well. According to the blending rates of DTBP and alpha olefin, various proportions of LPG blended fuels were obtained. In a constant volume chamber, a high speed digital camera was also employed to visualize the combustion characteristics of LPG fuel. The combustion pressures and heat-release rates of the LPG blends were also compared at various ambient pressures. As the results of measurements of exhaust emissions, CO and HC were reduced considerably, but CO₂ was increased by blending LPG with DTBP and alpha olefin.     

车用电控LPG发动机爆震控制的研究

为了兼顾不同成分的LPG的爆震特性,研究了一种动态的爆震控制策略。当发动机燃用辛烷值高的LPG时,采用较大的点火提前角;燃用辛烷值低的LPG时,自动减小点火提前角。通过试验验证了在不同点火提前角,不同发动机转速和负荷下的爆震特性。并以3种不同成份的LPG为例验证了此控制策略的有效性。     

Effect of various LPG supply systems on exhaust particle emission in spark-ignited combustion engine

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.     

LPG柴油双燃料发动机改装方案的模糊优选

针对研制出的LPG 柴油双燃料发动机的机械式和电子式LPG供气系统 ,采用模糊数学理论 ,以LPG供气方式及供油提前角为指标 ,根据对改装后的YC6 10 8Q柴油机的NOx ,HC ,CO ,PM ,额定功率及最大扭矩的测量结果 ,利用所建立的模糊评估函数 ,对双燃料发动机的改装方案进行了模糊优选