ADAPTIVE DESULFATION CONTROL ALGORITHM

摘要

The exhaust from a diesel-fueled internal combustion engine (201) is treated by a lean NO? trap (207). The maximum temperature used for desulfating the lean NOx trap (207) is kept relatively lower during early life and progressively increased as the trap (207) ages. Designing for adequate late life performance entails excess capacity during early life. The method utilizes the excess capacity available during early life to slow aging of the trap (207) and thereby extend the trap (207) lifetime. The method facilitates meeting durability requirements for diesel-powered vehicles with exhaust aftertreatment.