*A hydrogen-fueled engine combines optimized combustion, dedicated injectors, turbocharging, and electronic control to deliver diesel-like torque for medium-duty vehicles with near-zero tailpipe CO2 emissions for broader commercial truck integration.*
Division 03 Hydrogen Program Photos. Test cell in B151. Our division recently completed a relatively large program spanning a couple years to develop a custom hydrogen engine

Southwest Research Institute (SwRI) has completed development of a spark-ignited hydrogen internal combustion engine (H2-ICE) for medium-duty commercial vehicles, combining hydrogen-specific combustion hardware with an electronically controlled powertrain. The engine is designed to deliver diesel-like torque and performance while producing near-zero tailpipe CO2 emissions.
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The development is particularly relevant to vehicle electronics and powertrain engineers because hydrogen combustion introduces control challenges that differ from conventional gasoline or diesel operation.



Hydrogen burns faster and can increase the risk of pre-ignition and combustion instability, requiring tighter coordination between fuel injection, airflow, ignition, and engine-control strategies.

The team developed the engine through single-cylinder and multi-cylinder stages, initially concentrating on combustion and injection strategies before addressing system-level integration. The final design is based on a pent-roof-style engine architecture originally developed for gasoline combustion but modified for hydrogen operation.

A key change is the modified port geometry, which improves airflow and accommodates hydrogen’s faster combustion characteristics. A larger intake valve further improves volumetric efficiency, while dedicated hydrogen fuel injectors are used to deliver the fuel required for the combustion process. These changes work alongside a turbocharger to provide the airflow and boost needed to achieve torque characteristics comparable to thos

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