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The hydrogen combustion engine has a peak at high load and can achieve similar efficiency levels as a hydrogen fuel cell. [34] From this, one can deduce that hydrogen combustion engines are a match in terms of efficiency for fuel cells for heavy duty applications. Efficiency decreases for small internal combustion engines.
1991 – Mazda HR-X hydrogen Rotary; 1993 – Mazda HR-X2 hydrogen Rotary; 1993 – Mazda MX-5 Miata hydrogen Rotary; 1995 – Mazda Capella, first public street test of the hydrogen Rotary engine; 2003 – Mazda RX-8 Hydrogen RE hydrogen-gasoline hybrid Rotary; 2005 – Mazda Premacy Hydrogen RE Hybrid; 2007 – Mazda Hydrogen RE Plug in Hybrid
In 1970 Paul Dieges patented a modification to internal combustion engines which allowed a gasoline-powered engine to run on hydrogen. [114] Mazda has developed Wankel engines burning hydrogen, which are used in the Mazda RX-8 Hydrogen RE. The advantage of using an internal combustion engine, like Wankel and piston engines, is the lower cost of ...
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[citation needed] Hydrogen can be used and created in fuel cells to power electric motors or burnt directly in combustion engines. BMW has developed a bivalent internal combustion engine that can switch between petroleum and liquid hydrogen fuels. In gaseous form, hydrogen is difficult to store and has a low volumetric energy density.
Tenneco is working to accommodate growing demand to find H 2-ICE solutions for hard-to-abate mobility sectors.; The H 2-ICE test cell in Burscheid, Germany, operational since Q4 2022, was expanded with two additional cells, and a fourth new H 2-ICE test cell was recently commissioned in Ann Arbor, Mich.
Rotary engines of the Wankel design are used in some automobiles, aircraft and motorcycles. These are collectively known as internal-combustion-engine vehicles (ICEV). [18] Where high power-to-weight ratios are required, internal combustion engines appear in the form of combustion turbines, or sometimes Wankel engines.
In December 2023, NamX announced that they would update the HUV design to use a hydrogen internal combustion engine manufactured by Solution F. [11] This combustion engine emits less than 1g of CO 2 per 100 km (mainly through engine oil combustion residue). [12] The engine uses dihydrogen (H 2 or pure molecular hydrogen) as a fuel.