NOX REDUCTANT GENERATION IN A COMPRESSION-IGNITION ENGINE BYHYDROCARBON INJECTION DURING THE EXPANSION STROKE

摘要

The invention relates to a method for producing NO x reductants by injecting hydrocarbon into a diesel engine's combustion chamber during the expansion cycle. The secondary injected hydrocarbon is formed, under appropriate conditions, into oxygenates and olefins that are suitable for reducing NO2 species in the presence of conventional exhaus t catalysts. The appropriate injection timing is obtained by referring to a calibration obtained by direct engine measurements.