OXIDATION CATALYST BURN THRESHOLD ADJUSTMENT TO AVOID QUENCHING

摘要

A method of controlling an exhaust gas treatment system for an engine includes relating the usage of an oxidation catalyst to a temperature offset value, and increasing a current burn threshold temperature by the temperature offset value to define an adjusted burn threshold temperature. Hydrocarbons may be injected into a flow of exhaust gas when the temperature of the oxidation catalyst is equal to or greater than the adjusted burn threshold temperature. The temperature at which the hydrocarbons are injected into the exhaust gas is thereby increased to accommodate performance degradation in the oxidation catalyst, which extends the life of the oxidation catalyst.