发动机无凸轮轴气门驱动的研究与进展

阐述了在发动机上以电磁、电液、电气或其他方式驱动气门 ,实现无凸轮轴气门驱动 ,可以灵活改变气门正时 ,简化发动机结构 ,能有选择地闭缸 ,灵活改变发动机有效压缩比以适应多种燃料要求 ,使发动机获得比采用一般可变气门驱动更多的好处。无凸轮轴气门驱动的主要问题是响应速度不够高、气门落座冲击、能耗过高以及驱动系统复杂昂贵。目前无凸轮轴气门驱动还未达到大规模实用化的程度     

发动机新型电控系统的故障诊断的研究与开发

介绍了上海交通大学内燃机研究所研制的汽油机新型电控系统中的故障诊断部分的硬件组成及软件实现 ,包括CONTINUE诊断、KOEO诊断、ER诊断、OUTPUT诊断及喷油平衡诊断等 ,给出了程序总的流程图 ,详细介绍了故障诊断的原理、故障代码的输出及处理等。试验证明 ,此故障诊断能检测出发动机电控系统中的常见故障     

常规汽油机上实现电控点火提前的研究

在分析了点火提前的机械控制和电子控制两种方法的特点以及电子控制方法中的自适应 控制的研究现状的基础上，提出了常规机械控制的汽油机上仅利用分电器输出的点火信号进行点提关自适应控制的理论和方法，并进行了该理论方法可行性研究。     

柴油机船舶推进装置的建模和实时仿真

本文根据准稳态的概念建立了适用于实时仿真的二冲程柴油机船舶推进装置的多阶一性模型。在充分多的试验数据的基础上，结合工作原理建立了各子系统及整个装置的动态模型，这种模型既能反映柴油机内部各参数，精度较高，计算工作量也比较适中。文中提出了一些经验公式，使模拟得以有效地简化。最后，作为实例给出了３５０００吨油船推进装置的实时仿直     

桑塔纳2000GSi型轿车防盗系统结构原理与故障诊断

介绍桑塔纳2000GSi轿车防盗系统的结构原理,阐述防盗控制的自学习模式,以及故障诊断和系统检修内容。     

Improving pollutant emissions in diesel engines for heavy-duty transportation using retarded intake valve closing strategies

A combined theoretical and experimental study has been carried out to determine the real potential of reducing pollutant emissions in a HD diesel engine by means of retarding the intake valve closing. The effects produced by this alteration of the basic operation cycle have been examined by a preliminary modelling study, and from the obtained results, a modified camshaft was manufactured with a delayed intake valve closing of 60 crank angle degrees. Single-cylinder engine tests were carried out with this modified camshaft, and the emissions and fuel consumption were recorded. The results showed that the retarded intake valve closing can enhance the premixed combustion phase, and thus simultaneously reduce soot and NOx emissions. Moreover, the combustion process attained is extremely tolerant to exhaust gas recirculation, and by adoption of this measure, Euro-5 emissions limits can be achieved at the tested conditions without after-treatment.     

模糊神经网络在汽车发动机电子点火系统故障诊断中的应用

本文针对发动机电子点火系统的五种常见故障,借助发动机综合分析仪测得次级点火波形,并提取特征值,构造了一种模糊神经网络模型,利用MATLAB进行仿真,通过简单测试,得出这种方法是可行的,可以准确快速的诊断出故障原因。     

捷达轿车火花塞的失效分析

通常火花塞电极间隙在0.6mm～0.8mm，捷达轿车用电子点火取代了传统的分电器点火方式，并使用了闭磁路点火线圈，从而提高了点火能量，其点火间隙为1.0±0.1mm。介绍了捷达轿车火花塞的性能、常见失效形式及维修方法。     

柴油机曲轴整体应力分析方法的研究

本文针对曲轴整体计算巾的两个难点分别提出了新的解决办法.对确定曲柄臂刚度问题,先用有限元法计算单拐,再把求出的节点位移作为已知数,反求曲柄臂当量梁的等效刚度;对确定支承刚度则采用曲轴—机体的计算模型.文章以16V24DZJ 柴油机曲轴为例进行了计算,给出了主要的计算结果.与实测相比,平均误差16.8%.     

Comparison of HC species from diesel combustion modes and characterization of a heat-up doc formulation

This study summarizes engine speed and load effects on HC species emissions from premixed charge compression ignition (PCI) and conventional diesel combustion, and it evaluates diesel oxidation catalyst (DOC) formulations on a gas flow reactor for the purpose of diesel particulate filter regeneration or lean NO_x trap desulfation. HC emissions are sampled simultaneously by a Tedlar bag for light HC species and by a Tenax TA™ adsorption trap for semi-volatile HC species, and they are analyzed by gas chromatography with a flame ionization detector. The bulk temperature and residence time during combustion are key parameters that are important for understanding the effects of speed and load on engine-out HC emissions. The degree of post-flame oxidation is higher in PCI than in conventional combustion, and it is increased for PCI with a higher speed and load, as indicated by a lower fuel alkanes/THC ratio, a higher alkenes/fuel alkanes ratio, and a higher methane/THC ratio. Ethene and n-undecane are two representative HC species, and they are used as a surrogate mixture in the gas flow reactor to simulate PCI and conventional combustion with in-cylinder post fuel injection. Among the three DOC formulations tested, the catalyst with constituent precious metals of platinum and palladium (PtPd) showed the best light-off performance, followed by PtPd with an addition of cerium dioxide (PtPd+CeO₂), and platinum (Pt), regardless of exhaust compositions. Conventional combustion exhaust composition shows a lower light-off temperature than that of PCI, regardless of catalyst formulation.