H2 ICE stands for hydrogen internal combustion engine, also called hydrogen ICE. It burns hydrogen inside an engine to produce mechanical power. Like a gasoline or diesel engine, combustion pushes pistons that turn a crankshaft. The key difference is the fuel: hydrogen contains no carbon, so burning pure hydrogen does not produce fuel-derived carbon dioxide (CO2). Hydrogen combustion can still produce nitrogen oxides (NOx), which is why exhaust measurement remains important.
Hydrogen is supplied from an onboard tank to the engine, where it mixes with air and ignites in the cylinders. The resulting pressure moves the pistons and generates power. Engineers adjust the fuel delivery and combustion strategy to balance performance, efficiency, durability, and emissions.
An H2 ICE vehicle stores hydrogen onboard and burns it with air in an engine to power the vehicle. (Illustration shown for reference. Component layout and system configuration may vary by vehicle and application.)
Hydrogen combustion has a long history. The International Energy Agency notes that hydrogen powered some of the earliest internal combustion engines over 200 years ago. Today, engineers are developing hydrogen engines to meet modern performance, emissions, and safety requirements.
Hydrogen engines are being developed for medium- and heavy-duty transport. Adoption will depend on performance, NOx control, hydrogen supply and refueling infrastructure. Testing helps engineers assess these factors as designs advance.
An H2 ICE burns hydrogen in an engine to produce mechanical power. A fuel cell electric vehicle converts hydrogen into electricity through an electrochemical reaction, then uses an electric motor to drive the vehicle. Learn more about fuel cell electric vehicles.
Yes. Burning pure hydrogen produces water vapor and no fuel-derived CO2, but combustion with air can form NOx. Other exhaust components depend on the engine and its aftertreatment system. The U.S. Department of Energy explains why hydrogen combustion can produce NOx.
Existing engine knowledge and some testing infrastructure can support development, but hydrogen requires changes to fuel handling, engine controls, measurement, and test-cell safety. See what H2 ICE testing involves.
Interested in the wider hydrogen value chain? See HORIBA’s hydrogen measurement and analysis solutions.
See how HORIBA supports H2 ICE development with emissions measurement, engine testing, and test-cell safety solutions.
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