Abstract: A hydrogen fuel system for an internal combustion engine includes an electrolyzer for generating hydrogen and oxygen gases. A water reservoir in fluid communication with the electrolyzer is provided to maintain the water level in the electrolyzer at an optimum operating level. Hydrogen and oxygen generated by the electrolyzer may be routed to the internal combustion engine to provide the fuel for the engine. Hydrogen and oxygen generated by the electrolyzer which is not consumed by operation of the engine may be stored in pressurized storage tanks for use when required to power the internal combustion engine. Expanders are incorporated in the fuel system of the invention for recovering energy from high pressure high enthalpy process gases for charging the main electrical circuit of the invention.

Abstract: A hydrogen fuel system for an internal combustion engine includes an electrolyzer for generating hydrogen and oxygen gases. The engine exhaust may be recycled through the electrolyer where it is converted to hydrogen and oxygen. A water reservoir in fluid communication with the electrolyzer maintains the water level in the elctrolyzer. The hydrogen and oxygen generated by the electrolyzer may be routed to the internal combustion engine and provide the fuel for the engine. Hydrogen and oxygen not consumed by operation of the engine is stored in separate pressurized storage tanks. Expanders lower the pressure of pressurized hydrogen and oxygen for use to power the engine and provide electric power to the electrolyzer.