LPG／柴油双燃料发动机应用特性研究

本文采用复合燃料供给方式，在ＺＨ１１０５Ｗ型柴油机上进行了ＬＰＧ／柴油以燃料的应用研究试验，评价了ＬＰＧ／柴油双燃料发动机的动力性、经济性、排放等性能。试验结果表明：与燃纯柴油相比，双燃料发动机的动力性稍差，但经济性好，碳烟排放低。     

LPG／柴油双燃料发动机应用特性研究

本文采用复合燃料供给方式，在ＺＨ１１５Ｗ型柴油机上进行了ＬＰＧ／柴油双燃料的应用研究试验，评价了ＰＬＧ／柴油双燃料发动机的动力性、经济性、排放等性能。结果表明：与燃纯柴油相比，双燃料发动机的动力性稍差，但经济性好，碳烟排放低。     

柴油／LPG双燃料发动机实用化技术研究

介绍了一种将传统的在用柴油机（或车辆）改装成柴油/LPG双燃料发动机（或车辆）的实用化技术，通过大量的台架试验和在10辆城市公交车上的实际应用结果表明：与原型发动机（或车辆）相比，双燃料发动机（或车辆）的动力性没有下降，经济性有所改善，碳烟的排放下降50%以上，NOx的排放整体水平有所下降。     

LPG—柴油双燃料发动机排放研究

本文介绍了柴油机改燃ＬＰＣ－柴油双燃料发动机后的排放性能及对动力性能的影响。分析了影响双燃料发动机排放的主要因素，探讨了降低发动机排放与保持发动机动力性能的措施，为治理在用柴油汽车排烟污染提供了鉴戒。     

电喷汽油机进气系统改装浅析

进气系统是电喷汽油机的一个重要组成,进气系统的改装可提升汽车性能。如何通过进气系统改装提升电喷汽油机的性能,常用的改装方法有哪些,改装的前景如何,时下进气系统改装应规避哪些误区,这些方面是电喷汽油机进气系统改装中需要探讨和注意的。     

发动机进气调节系统的研究与应用

从发动机试验建立标准进气的必要性入手,结合排放试验室的进气调节系统,分析了确定工艺误差的可行性,并介绍了发动机进气调节系统的设计思想及系统的运行情况,最终实现了发动机进气温度、进气压力、进气湿度三参数的标准状态调控目标。     

内燃机冷却系统仿真

建立了某动力装置内燃机冷却系统模型,用该模型进行了仿真计算,并对仿真结果进行了分析.     

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.     

康明斯发动机高压油管成型技术的研究与分析

康明斯柴油发动机高压油管是东风汽车公司国产化重要项目之一。根据国产化过程试制的实践，从分析康明斯发动机高压油管的产品特征入手，着重就解决弯管尺寸控制的多元化分析和镦包成型中建立“同径一轴向压缩胀形”的力学模型进行研究与探讨，并根据研究与分析的原理对设备选择、模夹具设计进行论述。     

城市客车发动机进排气阻力的测试与分析

通过对城市客车发动机进、排气系统的测试、分析和改进,提高了进、排气系统的工作效率。     

天然气发动机故障模拟实验台试验分析

为教学而设计的天然气发动机故障模拟试验台,可以反复模拟发动机在不同工况下各传感器、执行器、电控单元以及线路的各种故障。并在此试验台上模拟了发动机有关传感器和执行器的故障,如进气压力传感器等,观察并记录了故障现象,定量分析了故障对发动机性能的影响。     

某型柴油机进气歧管优化分析

利用CFD软件计算某四缸柴油机各个气缸EGR废气分布,利用Boost软件计算发动机一个工作循环的边界条件,提供给3D模型作为输入。在CFD软件中计算并得到各个气缸的EGR率和EGR质量流量相对误差,由于计算结果不满足评价标准,因此对进气歧管模型结构进行优化,并再次按照以上步骤进行CFD计算。结果证明：优化方案进气歧管EGR分布均匀性很好,满足评价要求。     

Optimization of intake port design for SI engine

It is well known that in-cylinder flow is very important factor for the performance of SI engine. An appropriate in-cylinder flow pattern can enhance the turbulence intensity at spark time, therefore increasing the stability of combustion, reducing emission and improving fuel economy. In this paper, the effect of intake port design on in-cylinder flow is studied. It is found a vortex existed at the upper side of intake port of a production SI engine used in the study, during the intake stroke, which will reduce both tumble ratio and volumetric efficiency. A minor modification on intake port is made to eliminate the vortex and increase tumble ratio while keeping volumetric efficiency at the same level. It is demonstrated that the increase in tumble in the new design results in a 20 per cent increase in the fuel vaporization. In this study, both KIVA and STAR-CD are used to simulate the engine cold flow, as well as ICEM CFD and es-ice used as pre-processor respectively due to the complexity of engine geometry. Simulation results from KIVA and STAR-CD are compared and analyzed.     

135系列柴油机润滑系统非常见故障分析判断

对柴油机润滑系统非常见故障的原因及危害进行了分析。详细介绍了故障判断的方法和注意事项，对于实际工作有重要参考价值。