Volume 62

Investigation on the Influence of Injection Pulse Width on the Performance of a Hydrogen Internal Combustion Engine Kan Zhu, Diming Lou, Yunhua Zhang, Liang Fang, Piqiang Tan, Zhiyuan Hu

Abstract

Hydrogen injection strategy exerts a significant impact on the power performance, fuel economy, and emission characteristics of hydrogen-fueled internal combustion engines (HICEs). In this study, a heavy-duty six-cylinder port fuel injection (PFI) HICE was selected as the research object. Through bench tests, the influence of injection pulse width (IPW) adjustment on engine torque, brake thermal efficiency (BTE), and nitrogen oxide (NOₓ) emissions was systematically investigated. The results show that under most speed conditions, extending the hydrogen IPW leads to an upward trend in torque, with a slight decrease only at 1700 r/min. The maximum torque increase reaches 4.8% at a speed of 1900 r/min. At all speeds, increasing the IPW plays a positive role in improving BTE. When the speed is 1900 r/min and the IPW is expanded from 56 °CA to 68 °CA, the BTE increases by 4.35% cumulatively. In addition, under all speed conditions, a longer IPW causes varying degrees of increase in NOₓ emissions, and this trend is particularly significant at 1900 r/min. Compared with the IPW of 56 °CA, the NOₓ emission increases by 45% when the IPW is 68 °CA. The research results can provide a reference for the optimization of injection parameters and the coordinated improvement of performance and emissions of HICEs.

Keywords injection pulse width, hydrogen internal combustion engine, port fuel injection, performance