10/23/2023 0 Comments How many ic engines are on earthThis method leads to big efficiency gains, but still with fairly high emissions, Fenske said. "Reactivity" refers to a fuel's tendency to ignite under compression. This uses two fuels: a low-reactivity fuel (like gasoline) that is port injected, and a high-reactivity fuel (like diesel) that is direct injected. PCCI engines also have a fairly narrow operating range, with high potential for knock under full throttle, Fenske said.įinally, we have reactivity-controlled compression ignition (RCCI). That provides more control over ignition timing than HCCI, but can also create pockets of unburned hydrocarbon byproducts, which is bad for emissions. Fenske described it as a "middle ground" between diesel-engine compression ignition and HCCI, because it injects some fuel early to let it mix with air in the combustion chamber, and then injecting more fuel later. The next option is pre-mix charge compression ignition (PCCI).
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