Previous work has addressed pure compressed natural gas (CNG) as well pure hydrogen operation. Testing of CNG-hydrogen blends has been limited to CNG-rich blends and blends of 50%-50% CNG-H₂. In order to investigate actual vehicle behavior using this fuel, there is a need to test hydrogen-rich blends in a research engine. The target of Argonne's investigations is to identify the difference in combustion behavior, efficiency, engine performance and emissions of CNG blends as compared to pure hydrogen operation.

May 2008