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An Application of Blow-Down Supercharge System to a Multi-Cylinder HCCI Gasoline Engine
Published September 29, 2010 by Society of Automotive Engineers of Japan in Japan
To reduce a cylinder-to-cylinder variation in the ignition timing of a HCCI gasoline engine using the blow-down super charge (BDSC) system, secondary air injection was proposed. The effect of a secondary air injection into EGR gas on ignition timing was examined using a four-cylinder gasoline engine. Experimental result showed that with the secondary air injection into EGR gas, the cylinder-to-cylinder variation in the ignition timing was successfully reduced. Also, cylinder-to-cylinder variation in IMEP was reduced. As a result, the operational load range of the multi-cylinder HCCI operation with the BDSC system was extended without any disadvantage in exhaust emission.