PERFORMANCE OF A COMMON-RAIL TYPE HIGH PRESSURE UP TO 10 TO 20 MPA HYDROGEN GAS INJECTOR DEVELOPED FOR Dl HYDROGEN FUELED ENGINES

摘要

The engines with direct hydrogen injection have the advantage of very low emissions except for nitrogen oxides (NOx), the output power theoretically 1.2 times as large as that of gasoline engines and the complete elimination of the abnormal combustion. There is, however, difficulty in injecting a large amount of hydrogen gas because of the injection in gas phase.There were two disadvantages of the previous injection system. One was that the thermal efficiency decreased with the increase of the engine speed. The injectors needed longer injection time to inject gas fuel rather than liquid one.