柴油—天然气双燃料发动机介绍

本文通过对双燃料系统进行原理、系统优缺点介绍,经济性进行分析,认为双燃料发动机比柴油发动机有更大的推广潜力,使人们对双燃料重卡相对于柴油重卡有有比较深刻的认识。     

高压共轨电控柴油-天然气双燃料重卡匹配及应用研究

柴油-天然气双燃料重卡是在传统高压共轨电控柴油车的基础上,增加一套天然气供给系统和双燃料控制系统进行匹配研究的。该双燃料重卡可以工作在纯柴油和柴油-天然气双燃料两种模式下,增加了车辆的行驶里程;并且在双燃料模式下,天然气以平均80%以上的替代率,提高了车辆的经济性。     

甲醇-柴油双燃料重卡简介及前景分析

通过分析国内甲醇汽车行业现状,推出未来发展甲醇-柴油双燃料重卡更符合我国国情的结论。该双燃料重卡相比纯柴油车而言,不仅经济环保,又满足了续驶里程的需要。总之,该双燃料重卡具有广阔的前景。     

柴油-天然气双燃料重卡简介及市场前景分析

通过分析国内天然气行业现状和天然气重卡销售情况,认为目前发展柴油-天然气双燃料重卡更符合我国国情。该双燃料重卡突破纯天然气汽车续驶里程限制,不仅降低运营成本而且节能环保,在技术性能、二手车买卖、应用前景等方面更具市场推广价值。     

沃尔沃“可替代能源”重卡三重奏

沃尔沃在"可替代能源"重卡开发方面一直走在行业前列。本文对其使用FE混合动力、FM甲烷-柴油双燃料和FH生物二甲醚3类"可替代能源"的重卡进行了简要介绍,向读者展现了其在"可替代能源"方面的最新成果。该文对中国汽车及能源产业具有极为重要的参考价值。     

CNG／LNG重卡供气系统的原理、组成及案例分析（上）

CNG（压缩天然气）、LNG（液化天然气）两种全系列天然气重卡车型是陕西重型汽车有限公司整合新能源汽车技术以及重卡零部件资源优势而开发的新产品,其广泛适用于公路运输、专用车等领域.两种天然气重卡车型的整车燃料供给系统和发动机相关部件是在成熟技术的基础上根据车用燃料的要求进行设计的,极好地满足了CNG、LNG燃料的技术要求.同时,陕西重汽天然气重卡产品采用了多项世界领先专利技术,使其高效节能、绿色环保,填补了我国天然气重型商用车产品的空白.除此之外,陕西重汽于2011年9月与潍柴西港发动机公司联合开发出了柴油-天然气双燃料的HPDI（High Pressure Direct Injection）缸内高压直喷技术新车型.天然气重卡车型的开发,具有极高的经济效益和社会效益.     

沃尔沃推出FM双燃料牵引车

正日前,沃尔沃卡车在瑞典哥德堡展出了双燃料FM4×2牵引车。新车在以柴油为动力的基础上,搭载LNG气罐,并且采用侧置分布在车辆左侧。在柴油车管控日益严峻下,以LNG为动力的重卡也即将成为主流。沃尔沃FM双燃料牵引车具有以下特点。     

重卡悬架系统成本分析与价值研究

文章通过对重卡市场现有不同类型悬架系统的成本对比,简要分析了不同类型的悬架系统因成本差异及重量差异对车辆运营收益带来的价值影响,以此期望对重卡企业在悬架系统的改进和提升提供经济性参考;同时,结合重卡轻量化,为助力客户减少运营成本,提升运营收益进行研究探讨。     

HOWOA7系列ASR系统简介及故障诊断

随着国产重卡对安全性的不断提高,国产牵引汽车已经开始标配ABS系统,但是具有ASR功能的ABS系统目前还是在一些国内高端重卡上选装。而代表国内高端重卡的HOWO-A7标配WABC0公司的具有ASR功能的ABS系统。     

CNG/柴油发动机油气切换系统的优化控制

CNG/柴油双燃料的出现解决了由于经济高速发展带来的汽车保有量迅速增加对燃料的需求,以及所造成的环境问题,它是石油的理想替代品。文章首先研究了CNG/柴油双燃料汽车发动机供给系统的组成和控制原理,并对目前所使用的双燃料发动机的油气切换系统进行了可行的优化控制。     

降低柴油/LPG双燃料发动机碳烟排放的试验研究

针对城市公交柴油客车一直难以解决的碳烟排放问题进行了大量的试验研究,开发出一种柴油／LPG 双燃料发动机用的燃料供给和控制系统。经柴油机改装和装备该系统的柴油／LPG双燃料发动机在运行过程中能 够在柴油运行模式和柴油／LPG双燃料运行模式之间平稳切换,在双燃料运行模式下能够保证发动机的动力性和 经济性,碳烟排放大幅度降低,最大可降低至柴油工况的80％。     

Operating strategy for gasoline/diesel dual-fuel premixed compression ignition in a light-duty diesel engine

Environmental problems have become a major issue for diesel engine development. Although emission aftertreatment systems such as DPFs (diesel particulate filters), LNTs (lean NOx traps) and SCR (selective catalytic reduction) have been used in diesel vehicles, the manufacturing cost increase caused by this equipment can be hard to be control. Thus, it is better for engine emissions to be reduced by improving the combustion system. A dual-fuel combustion concept is a recommended method to improve a combustion system and effectively reduce emissions. Low reactivity fuel including gasoline and natural gas, which was supplied to the intake port by the FPI (port fuel injector), improved the premixed air-fuel mixture conditions before ignition. Additionally, a small amount of high reactivity fuel, in this case diesel, was injected into the cylinder directly as an ignition source. This dual-fuel combustion promises lower levels of NOx (nitrogen oxide) and PM (particulate matter) emissions due to the elimination of local rich regions in the cylinder. However, it is challenging to control the dual-fuel combustion because the combustion stability and efficiency deteriorate due to the lack of ignition source and reactivity. Thus, it is important to establish an appropriate dual-fuel operating strategy to achieve stable, high efficiency and low emission operation. As a result of this research, a detailed operating method of dual-fuel PCI (premixed compression ignition) was introduced in detail at a low speed and low load condition by using a single cylinder diesel engine. Engine operating parameters including the gasoline ratio, a diesel injection strategy consisting of multiple injectors and timing, the EGR (exhaust gas recirculation) rate and the intake pressure were controlled to satisfy the low ISNOx (indicated specific NOx) and PM emissions levels (0.21 g/kWh and 0.1 FSN, 0.040 g/kWh, respectively) as per the EURO-6 regulation without any after-treatment systems. The results emphasized that a well-constructed dual-fuel PCI operating strategy showed low NOx and PM emissions and high GIE (gross indicated fuel conversion efficiency) with excellent combustion stability.     

Reduction of emissions with propane addition to a diesel engine

Recent studies on dual-fuel combustion in compression-ignition (CI) engines, also known as diesel engines, fall into two categories. In the first category are studies focused on the addition of small amounts of gaseous fuel to CI engines. In these studies, gaseous fuel is regarded as a secondary fuel and diesel fuel is regarded as the main fuel for combustion. The objectives of these studies typically involve reducing particulate matter (PM) emissions by using gaseous fuel as a partial substitution for diesel fuel. However, the addition of gaseous fuel raises the combustion temperature, which increases emissions of nitrogen oxides (NO_x). In the second category are studies focused on reactivity-controlled compression-ignition (RCCI) combustion. RCCI combustion can be implemented by early diesel injection with a large amount of low-reactivity fuel such as gasoline or gaseous fuel. Although RCCI combustion promises lower NO_x and PM emissions and higher thermal efficiency than conventional diesel combustion, it requires a higher intake pressure (usually more than 1.7 bars) to maintain a lean fuel mixture. Therefore, in this study, practical applications of dual-fuel combustion with a low air-fuel ratio (AFR), which implies a low intake pressure, were systemically evaluated using propane in a diesel engine. The characteristics of dualfuel combustion for high and low AFRs were first evaluated. The proportion of propane used for four different operating conditions was then increased to decrease emissions and to identify the optimal condition for dual-fuel combustion. Although the four operating conditions differ, the AFR was maintained at 20 (? approximately equal to 0.72) and the 50% mass fraction burned (MFB 50) was also fixed. The results show that dual-fuel combustion can reduce NO_x and PM emissions in comparison to conventional diesel combustion.     

D6114柴油/CNG双燃料发动机的试验研究

D6114柴油/CNG双燃料增压中冷发动机当以双燃料方式工作时,发动机起动和怠速只燃用柴油;当转速超过某设定值,电控系统发出指令限制柴油的喷油量,天然气经混合器进入气缸参与燃烧,此时少量柴油供给主要起引燃作用,发动机负荷变化则通过改变天然气供给量的大小来实现。分析了进气温度、替代率、供油提前角对性能和排放的影响,指出按NMHC排放衡量,该双燃料发动机完全可以达到ECER49欧I标准。     

柴油-天然气双燃料发动机的性能研究

在高压共轨电控柴油发动机的基础上,研发了柴油-天然气双燃料发动机。该发动机在原机电控系统保持不变的情况下,增加了一套双燃料电控系统,使其可以在纯柴油和柴油天然气双燃料两种模式下工作。在柴油天然气双燃料模式下,以少量的柴油引燃适量的天然气进行混合燃烧,达到与原机相同的功率及扭矩输出,天然气对柴油的平均替代率达85%以上,提高了该发动机的经济性。     

柴油机行业发展动态研究报告

从近几年走势来看，除重卡增减波动幅度较大以外，其它车型的波幅相对小而稳定，一般不大于15％。故从某种意义上讲，重卡的市场走向决定了车用柴油机的市场走向。     

生物制气发动机最大扭矩转速燃烧排放分析

介绍了采用气化炉热解气化各种农林废弃的生物质,得到可燃生物制气。将柴油机改制成柴油/生物制气双燃料发动机进行试验,用生物制气作为主要燃料,由柴油引燃。测量生物制气/柴油双燃料发动机在最大扭矩转速时的气缸压力及废气排放,分析燃烧特性及对排放物生成的影响,并对比分析柴油机与双燃料发动机的差别。     

某重型混合动力垃圾车方案设计

本文以某传统6X4型柴油重卡为原型,根据国内混合动力商用车发展现状,经过合理匹配计算,设计一款混合动力6X4型垃圾车.     

DDF电控柴油／天然气双燃料客车

介绍柴油／天然气双燃料汽车的优势，重点阐述DDF电控柴油／天然气双燃料客车的控制系统及整车的性能试验结果。