Patent ID: 8863499
Filing Date: 2014-10-21
Classification: F01N,Y02T

Abstract:
1. An exhaust gas treatment system for an internal combustion engine, comprising: an exhaust gas conduit in fluid communication with, and configured to receive an exhaust gas from the internal combustion engine; a diesel exhaust fluid (“DEF”) source in fluid communication with the exhaust gas conduit, the DEF source supplying a DEF having a quality factor; a selective catalytic reduction (“SCR”) device in fluid communication with the exhaust gas conduit and configured to receive the exhaust gas; a NO a control module in communication with the DEF source and the NO store a diagnostic adaptation factor and an expected NO determine a controls adaptation factor based on a deviation between the NO selectively update the diagnostic adaptation factor with the controls adaptation factor; preserve the selectively updated diagnostic adaptation factor if a reductant fluid quality test is determined to be failed; and reset the selectively updated diagnostic adaptation factor to a nominal value if the reductant fluid quality test is determined to be passed.