Hydrogen engines are ideal for high load cycles with sudden load changes and cope well with heat, dust and vibration.
MAHLE Powertrain is supporting automotive supplier MAHLE’s development service provider, Liebherr Machines Bulle SA, in their research aimed at developing a hydrogen-fueled internal combustion engine. Their work includes the use of MAHLE’s Prechamber Jet Ignition System (MJI). Engine tests have shown that using this technology, a mixture of hydrogen and air can be ignited and burned at a high compression ratio, which makes the combustion process very efficient and stable. This paves the way for hydrogen generated in climate-neutral processes for use in heavy-duty and off-road applications, such as excavators, track vehicles and wheel loaders.
“The use of hydrogen as a combustion fuel has the potential to make many heavy-duty and off-road applications climate-neutral,” says Peter Wiske, Director of Corporate Advanced Engineering at MAHLE. “A large number of studies in recent decades have shown that hydrogen can be used in internal combustion engines without any problems.”
To achieve stable operation with high compression ratios while avoiding engine knock and pre-ignition, hydrogen engines must be operated with large amounts of excess air. The energy of a conventional spark plug is not enough to ignite such a mixture. MAHLE jet ignition solves the problem by burning a small amount of a flammable mixture in the prechamber cylinder. The resulting gas plasma is passed through small openings in the main combustion chamber and, due to its high energy content, ignites the main gas mixture rapidly and evenly. Tests with Liebherr’s H966 and H964 engines have produced excellent results in terms of combustion speed, performance and emissions.
Hydrogen engines are ideal for high load cycles with sudden load changes and cope well with heat, dust and vibration. This makes them an excellent choice for use in heavy-duty and off-road applications, where fuel cells hit their limits more quickly.
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MAHLE has traditionally held strong expertise in air management, filtration, thermal management and power electronics. The Stuttgart-based technology group already has about 100 employees working on hydrogen-related projects. MAHLE has been a supplier for fuel cell vehicles for more than ten years and operates a hydrogen testing center on a 1,400-square-meter site in Stuttgart. As a member of the Hydrogen Council, it also campaigns at the political level for the expansion of hydrogen technology.
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