Diagnosis and control of abnormal combustion of hydrogen internal combustion engine based on the hydrogen injection parameters

Abstract

In order to improve the limitation of evaluating the abnormal combustion problem of hydrogen internal combustion engine by single index, the abnormal combustion risk coefficient is proposed and defined based on AHP(Analytic Hierarchy Process)-entropy method. The abnormal combustion risk of PFI hydrogen internal combustion engine is comprehensively evaluated from multiple indexes such as the uniformity coefficient of the mixture, the temperature of the hot area, the maximum temperature rise rate, the residual amount of hydrogen in the intake port and the cylinder temperature at the end of the exhaust. The influence of hydrogen injection parameters on abnormal combustion was explored. The results show that the temperature and the maximum temperature rise rate in the hot area decrease first and then increase with the increase of hydrogen injection angle and hydrogen injection flow rate. Although large hydrogen injection angle and hydrogen injection flow rate can reduce the cylinder temperature at the end of exhaust, they will increase the residual hydrogen amount in the intake port. Appropriate hydrogen injection angle and hydrogen injection flow scheme can ensure that all parameters are at a better level, so that the risk coefficient of abnormal combustion decreases by 2.1%–5.5%, and the possibility of abnormal combustion is reduced. • Proposing the concept of abnormal combustion risk coefficient for the first time. • Comprehensive consideration of factors that may cause abnormal combustion. • The risk of abnormal combustion was assessed using the Analytic Hierarchy Process-entropy method. • This study helps to quantify the trend of abnormal combustion occurrence in hydrogen internal combustion engines. • It provides a new method for suppressing abnormal combustion issues in hydrogen internal combustion engines.