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Erschienen in:
2022 | OriginalPaper | Buchkapitel
Engine Component Development for H 2 Combustion Engines
verfasst von : Hannes Marlok, Christian Trabold, Alexander Puck
Erschienen in: Heavy-Duty-, On- und Off-Highway-Motoren 2021
Verlag: Springer Fachmedien Wiesbaden
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Abstract
Currently, by far the largest share of CO2 emissions in transport – around 80% – is caused by long-haul and heavy-duty vehicles with long range and/or high performance requirements. For these applications, the hydrogen combustion engine (H2 engine) offers an effective addition to the fuel cell, to achieve a CO2-free commercial vehicle sector
In order to achieve diesel-like standards of robustness and functionality, extensive investigations are carried out on a research H2 test engine, which is installed and tested at MAHLE. In this paper, the challenges for the H2 engine core components piston, piston rings and valve sets are presented, as well as measures to meet the high requirements illustrated.
The adaptation of the baseline diesel engine to spark-ignited H2 combustion offers the possibility to use aluminium pistons. However, this leads to challenges regarding the piston shape, which have been matched against the background of thermomechanical stress.
The conflicting objectives between lubrication, oil consumption and blowby are one of the central challenges in the development of H2 engines. By optimizing the power cell unit, the blowby and lubricating oil consumption can be decreased, thus reducing the crank case ventilation requirements and the preignition risk.
Valve set material solutions for applications with gaseous fuels and thus more challenging dry tribological conditions are well known. A new requirement for the material development of H2 engines is the combination of moderate thermal load and high potential corrosion load due to the high water content in the exhaust gas.