Advanced combustion has drawn much attention from researchers due to the increasingly strict emissions regulations. Partially-Premixed Charge Compression Ignition (PCCI) combustion mode creates a premixed charge inside the cylinder before ignition occurs. As a result, NOx, and Particulate Matter (PM) emissions can be reduced simultaneously without a penalty on the engine's efficiency. Its basic operating mechanism is to prolong the mixing timescale of the fuel-air mixture by separating the end of the injection and the start of the combustion. Three different fuels: Ultra Low Sulfur Diesel (ULSD), Low Temperature Fischer-Tropsch (LTFT) fuel and Renewable Diesel are tested in this research. The engine performance, PM, NOx, CO, Unburned Hydrocarbon (UHC) emissions and particle size distribution are examined for conventional combustion mode and PCCI combustion modes for a range of injection timings. LTFT fuel produces lowest PM emissions among the three fuels, and PM emissions are reduced by PCCI combustion modes. ULSD and Renewable diesel has increased PM emissions for PCCI combustion modes due to the increased UHC emissions.

Impact of fuel and injection timing on partially-premixed charge compression ignition (PCCI) combustion mode

248th National Meeting (2014)

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