Noble Hydrogen Engine with Knock-less and Low NO _X Emission Employing Hydrogen Gas-jet Combustion and Z-crankshaft Mechanism

Hydrogen engines have problems of knocking, lower thermal efficiency and NO_X emission. These problems are caused by the hydrogen characteristics of high burning velocity. This study tried to reduce rapid combustion of hydrogen. Hydrogen was injected directly into the combustion chamber and the hydrogen-jet was ignited by a spark plug. Moreover, this kind of combustion system was applied to a newly developed engine employing Z-crankshaft mechanism. This mechanism can realize a quasi-constant volumetric cycle. In the result, the engine realizes knock-less combustion with low NO_X emission. In addition, Z-crankshaft engine can keep high thermal efficiency even at late ignition timing.