This study proposed an ammonia-to-hydrogen- proton exchange membrane fuel cell (PEMFC) and hydrogen-doped internal combustion engine (ICE) hybrid system and investigated its application of this system in a large-scale mobile power scenario. The study analyzed how the total hydrogen supply to the PEMFC and ICE, as well as the distribution ratio of the PEMFC, affects the hybrid system’s performance by simulation. Two regulation strategies—constant and step regulation were proposed, and 12 regulation schemes were formulated. Seven performance in...