Without soot, compression ignition engines are not limited to lean operation and can instead use the stoichiometric air-fuel ratio.

Use of soot-free “Clear” Exhaust Gas Recirculation (EGR) can allow for lower NOx emissions without the competing soot constraint, meeting next-generation emissions standards without added aftertreatment complexity. Low-sooting fuels allow for the elimination of diesel particulate filtration (DPF). In a high-temperature environment, any fuel will behave like diesel fuel, having short ignition delay and burning as it is injected in a mixing fuel plume. While the wide availability, cost-effectiveness, and lower emissions of ethanol make it the fuel of choice today for the engine, ClearFlame’s technology is fuel-agnostic and can run on a range of renewable fuels.ĬlearFlame’s solution elevates combustion temperatures in order to enable use of non-traditional fuels-that fail to ignite using conventional diesel-style MCCI (mixing-controlled compression ignition)-without sacrificing performance. The demonstration of ClearFlame’s engine technology was implemented by taking a Class 8 diesel truck running on a Cummins X15 500hp 15L heavy-duty engine-commonly used for long-haul truck and off-highway applications-and converting it to run on renewable E98 ethanol. ClearFlame Engine Technologies, a a startup developing net-zero engine technology ( earlier post), successfully completed an on-road demonstration of its proprietary technology that enables a heavy-duty truck diesel engine to operate on low-carbon and carbon-negative fuels, including 100% renewable plant-based fuels.

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