Abstract
Hydrogen-fueled internal-combustion engines show significant potential for low-pollution exhaust emissions. Especially when internal cryogenic air/fuel mixture formation is employed, the probability is good that exhaust emissions will remain below existing limits. The injection pressure requirements for internal mixture formation could be met by high-pressure fuel pumps for liquid hydrogen. Therefore, research and development work in advanced onboard fuel is of foremost importance. Refilling of liquid-hydrogen vehicular tanks, even by untrained people, and safety aspects are further areas for R&D work. An overview is included in this páper on experience gained from accidents involving liquid-hydrogen-fueled vehicles.
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