Research and development of hydrogen direct-injection internal combustion engine system

摘要

The research and development of hydrogen-internal combustion engine (ICE) system for heavy-duty trucks, with the goal of allowing carbon dioxide (CO_2)-free operation in transportation department, has been carried out. The high-pressure hydrogen gas direct-injector was adapted to the single-cylinder ICE. The high-pressure direct-injection combustion system shows that high thermal efficiency, high specific output and low NO_x emission were confirmed. From these results, it is concluded that the possibility of the application from those results to a multi-cylinder hydrogen-ICE is high. The NO_x storage reduction (NSR) catalyst system was applied as the after-treatment device of the exhaust NO_x emission from hydrogen-ICE and it was confirmed that very low effect to fuel consumption and high reduction effect of NO_x emission were feasible experimentally.