Investigation of Active Flow Control on Diesel Engine Aftertreatment

Theoretical studies are performed with one-dimensional transient modeling techniques to analyze the thermal behavior of the diesel aftertreatment systems when active flow control schemes are applied. The combined use of activegas flowandactivefueling-controlschemesareidentifiedtobecapableofshiftingtheexhaustgastemperature, flow rate, and oxygen concentration to more favorable windows for the filtration, conversion, and regeneration processes. Several external fuel-supplying techniques are applied and analyzed with various heat distribution patterns and exhaust flow control parameters. The analysis indicates that the active flow control schemes have fundamental advantages in optimizing the converter thermal management that includes supplemental heating, thermal retention, thermal recuperation, and overheating protection. Modeling validation analyses with selected experiments are also reported.