振动信号在均质压燃发动机着火时刻识别中的应用  

Application of vibration signals in HCCI engines' ignition timings identification

作　　者：程勇[1] 唐娟[1] 黄敏莉[1] 

机构地区：[1]山东大学能源与动力工程学院,济南250061

出　　处：《汽车安全与节能学报》2011年第1期77-84,共8页Journal of Automotive Safety and Energy

基　　金：国家自然科学基金(50876055);汽车安全与节能国家重点实验室开放基金(KF09112)

摘　　要：着火时刻是燃烧控制的基本反馈参数,对拓展均质压燃(HCCI)燃烧工况具有重要作用。该文基于发动机机体、缸盖有限元模型,提出采用测量缸盖振动速度或加速度判断着火始点的方法,建立了振动传递系统模型。在一台295HCCI发动机上进行了试验验证,利用实测振动速度和加速度信号对着火时刻进行了识别。结果表明:不同工况下,利用缸盖表面振动速度和加速度信号所得的着火时刻滞后于根据压力升高率和压力二次导数得到的着火时刻;本文所提出的着火时刻的测量与判断方法是合理可行的。Engine ignition-timing is a basic combustion control feedback parameter, and is important for developing the homogeneous charge compression ignition （HCCI） combustion conditions. An ignition-timing identify method was proposed based on measuring vibration velocities and accelerations of the cylinder head using an engine block cylinder bead＇s finite element model and a vibration transmission system model. The vibration velocities and accelerations were measured on a 295 HCCI engine. The results show that there is a lag angle between the ignition timings determined by the vibration responses and determined by the rate of pressure rise and the second derivative of in-cylinder pressure in different conditions with the lag angle average value within system deviation. Therefore, the method based on vibration responses can be used to identify combustion timings.

关 键 词：均质压燃(HCCI) 缸盖振动速度 缸盖振动加速度 着火时刻 

分 类 号：TK421.24[动力工程及工程热物理—动力机械及工程]