hydrogen engine can act as an accelerator for building up a
hydrogen infrastructure. The properties of hydrogen are quite
different from the presently used hydrocarbon fuels, which is
reflected in the design and operation of a hydrogen fueled ICE
(H2ICE). These characteristics also result in more flexibility in
engine control strategies and thus more routes for engine
optimization. This article describes the most characteristic
features of H2ICEs, the current state of H2ICE research and
demonstration, and the future prospects.