基于压力升高率的氢燃料发动机异常燃烧分析与控制

Analysis and control of abnormal combustion of hydrogen fueled engines based on pressure rise rate

为了消除氢燃料发动机的异常燃烧,并且为解决异常燃烧与提高氢发动机功率的矛盾提供参考,本文阐述了氢燃料发动机异常燃烧的发生机理。分析了氢发动机压力升高率与早燃的关系,研究了早燃的诊断方法,试验指出:运用小波分析方法可以诊断氢发动机在不同压力升高率下发生早燃的时间和严重程度。通过试验得出了影响氢发动机压力升高率的最主要运转因素是点火提前角和过量空气系数。在进一步分析这2个运转参数与压力升高率之间关系的基础上,得出了氢发动机关于压力升高率的控制规律。为消除氢发动机异常燃烧提供了一种定量的控制方法。

The mechanism of abnormal combustion of hydrogen fueled engines was discussed in this paper for controlling abnormal combustion of hydrogen fueled engines,and providing references to resolve the contradiction between abnormal combustion and power output. Moreover,the relationship between pre-ignition of hydrogen fueled engine and its pressure rise rate was analyzed,and diagnosed method on the pre-ignition was investigated. The experiment results showed that the time and the severe degree of pre-ignition under different pressure rise rate could be diagnosed by using the wavelet analysis method. Based on the experiment it is found that the most important factors effecting pressure rise rate of hydrogen fueled engines are spark advance and excess air ratio. Finally,the formulae between the pressure rise rate of the engine and spark advance,and between the pressure rise rate of the engine and excess air ratio,were respectively established by data fitting,so that control law about the pressure rise rate of the engine was also formed. This can provide a mensurable method for restraining the abnormal combustion of the engine.