Abstract
A Urea-SCR system can significantly reduce the tailpipe-out nitrogen oxide (NO x ) of a diesel engine vehicle. However, future emission legislations in Europe and U.SA require the Urea-SCR system both to improve NO x conversion efficiency and to suppress ammonia(NH 3 )-slip at the same time. The robustness of the management control of the Urea-SCR system has to be significantly improved in regard to the part-to-part variations of Urea-solution injector and the aging effect of a SCR catalyst. Consequently, the management control was composed of a feedforward controller, a NH 3 storage controller and a feedback controller using an NH 3 sensor located downstream of the SCR catalyst, and a unique adaptive algorithm was applied to improve the robustness of the management control. As a result, it could improve the robustness of NO x conversion efficiency, and reduce NO x to the lower level than emission legislations' requirement while keeping NH 3 -slip at slight level.
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