高压共轨柴油机失火发生器设计及优化

以产品开发为目标,根据高压共轨柴油机燃油喷射特点设计了失火发生器。失火发生器采用16位MC9S12XS128单片机和FPGA分别设计了失火发生器的主控模块和远程控制模块,同时采用模块化设计方法设计了各模块的控制程序。试验结果表明：控制系统能够按照设定的失火模式和失火率发生失火,最大脉冲数可达10次,最大缸数为8缸,失火率控制精度达±0.1%,可设置的失火范围为0-99.9%,适合四冲程多缸发动机。

基于催化器放热效应的失火故障阀值匹配方法研究

在各工况下发动机持续失火导致催化器损坏的失火故障阀值匹配是失火诊断的重要内容。文章基于对失火状态时催化器放热效应的特性研究及试验验证,提出了离线匹配该失火率的方法,并在多个项目上进行了试验验证。结果表明:通过该方法确定的失火率与常规通过转毂试验确定失火率的差异较小,该方法的实施及应用,可节省匹配工时及提升转毂试验匹配精度。

含锰抗爆剂对发动机的影响及其缓解措施

MMT是一种性能优异和廉价的含锰汽油抗爆剂，目前在我国市售汽油中应用很普遍．MMT同其他金属抗爆剂类似，会对部分发动机和排放系统产生一系列的影响，如THC排放增加、锰氧化物沉积、失火率增加、排气温度上升、动力性和经济性恶化、部件失效、大气污染等．特别是在同其他抗爆剂（如乙醇）联合使用时更容易超过电控系统调节的范围而加剧其不利因素．通过分析，找到了缓解措施：重新改进和匹配三元催化器、优化控制软件等．新研制的三元催化器的使用和I型试验的排放数据表明，THC已经达到了20％-30％国IV限值．而从长远看，仍然需要推广使用环保和无害的抗爆剂（如乙醇等），逐步减小和取消MMT或其他金属抗爆剂的使用．

Thermal Analysis and Kinetics of Coal during Oxy-Fuel Combustion

The pyrolysis and oxy-fuel combustion characteristics of Polish bituminous coal were studied us/ng non- isothermal thermogravimetric analysis. Pyrolysis tests showed that the mass loss profiles were almost similar up to 870℃ ha both N2 and CO2 atmospheres, while further mass loss occurred ha CO2 atmosphere at higher temper- atures due to char-CO2 gasification. Replacement of N2 ha the combustion environment by CO2 delayed the com- bustion of bituminous coal. At elevated oxygen levels, TG/DTG profiles shifted through lower temperature zone, ignition and burnout temperatures decreased and mass loss rate significantly increased and complete combustion was achieved at lower temperatures and shorter times. Kinetic analysis for the tested coal was performed using Kissinger-Akahira-Sunose （KAS） method. The activation energies of bituminous coal combustion at the similar oxygen content in oxy-fuel with that of air were higher than that in air atmosphere. The results indicated that, with O2 concentration increasing, the activation energies decreased.