Abstract
Hydrogen engines are required to provide high thermal efficiency and low nitrogen oxide (NOx) emissions. There are many possible combinations of injection timing, lambda and EGR rate that can be used in a direct-injection system for achieving such performance. In this study, NOx emissions of natural aspirated 4 cylinders engine with management strategies involving the injection timing, ignition timing, lambda and the EGR rate were evaluated under a Japanese JE05 emissions test cycle. Finally, the paper projects the potential of direct injection hydrogen engine for obtaining high output power and attaining low NOx emissions of 0.7g/kWh under the emission test cycle with NSR catalyst.
