Hydrogen engine operation strategies: Recent progress, industrialization challenges, and perspectives

As the main energy consumption terminal and emission source, the engine is expected to achieve zero carbon emission with the help of hydrogen energy. Focusing on the current status and difficult issues of hydrogen engine research, this paper firstly emphasizes the importance of applying hydrogen energy in the future development of engines, secondly reviews and summarizes the development of hydrogen engines in terms of traditional structural inheritance and innovation, and then provides updated ideas for the development route of pure hydrogen fuel and the promotion of hydrogen fuel applications from the perspective of new combined fuels and industrialization challenges. A summary of the classification of hydrogen engine operating strategies is included to point out the prevailing regulation and influencing factors on hydrogen engines and the understanding of the working process. The obstacles to industrialization are related to a broader field, besides the field of scientific research, there are issues of infrastructure development, cost control, and safety standards development. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.