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Reactivity controlled compression ignition (RCCI) is a form of internal combustion developed at the Engine Research Center, University of Wisconsin–Madison, United States, by the research group of Wisconsin Distinguished Professor Rolf Reitz.[1]
During RCCI combustion,[2] well-mixed low-reactivity fuel and oxidizer (typically air) are compressed but not reaching auto-ignition. Later, still during compression cycle, high-reactivity fuel is injected to form a local mixture of low- and high-reactivity fuel. Finally the whole fuel charge is ignited near top dead center of the piston by injection of high-reactivity fuel. The RCCI combustion process requires two different fuels. Low-reactivity fuel gets injected into the intake ports with low pressure during the intake stroke. High-reactivity fuel gets injected into the cylinder with high pressure at the end of compression stroke. A throttle characteristic to Otto engines is not needed. Because of compression ignition and lack of throttle control, RCCI resembles much the diesel process. The dual-fuel RCCI can produce ultra-low NOx and soot emissions and higher thermal efficiency compared to conventional diesel combustion.[3]
RCCI patents are controlled by University of Wisconsin–Madison’s Wisconsin Alumni Research Foundation (WARF).[4] Several derivative ideas have also been experimented with by Caterpillar.[5][6]
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