| Abstract:A one-dimensional model of hydrogen internal combustion engine was built, and the effects of exhaust gas recirculation technology (EGR) and Miller cycle technology on the suppression of knocking and nitrogen oxides (NOx) generation were simulated and analyzed. At last, these two technologies were combined to explore the maximum achievable compression ratio and the best NOx emission performance. The results show that EGR technology is more effective in suppressing NOx production, while the Miller cycle is more effective in suppressing knocking. Finally, the compression ratio of the internal combustion engine can be increased from 10 to 18.4, the efficiency is 44.87%, which is increased by 8.0%, and NOx emissions are reduced to 1.937 g?(kW·h)-1 at the same time, which is reduced by 26.2%. |