Authors

Jonathan ZIEGLER, Matthias BLESSING, Andreas SCHNEIDER, Hagen WALTER, Marilou TONN 
Daimler Truck AG, DE

Summary

Hydrogen combustion engines can make an additional contribution to the decarbonization of heavy-duty transport. The baseline of our H2-ICE prototype M473 is our 15.6-liter diesel engine, of which approximately 80% of the components could be adopted without modification for the hydrogen combustion concept. The use of the 15.6 litres base engine presents the challenge of achieving the typical fleet requirement of 350 kW output using hydrogen combustion. Classical knock phenomena in spark-ignition engines limit the ability to advance the combustion phasing to earlier, more efficient timings. In spark-ignition combustion strategies, retarding the ignition timing is a common method to avoid knocking. However, due to the specific properties of hydrogen — particularly under the targeted high dilution ratio — thermodynamic boundary conditions arise at late ignition timings and high end-of-compression pressures that reduce ignition delay and therefore promote auto-ignition of the hydrogen-air mixture.
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