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Urea-SCR control system  Diesel engines effectively reduce automotive CO 2 emissions. Technologies for reducing NO x emissions are also essential, however, for diesel engine use. The research discussed in this paper focuses on urea-SCR as after-treatment system for converting NO x , and proposes the urea-SCR control based on NH 3 sensor output. The NH 3 sensor effectively reduces both NO x , and NH 3 slip. The control adjusts the amount of urea dosed to the catalyst based on changes in NH 3 slip timing and NH 3 concentration in order to compensate for part-to-part variations in the SCR catalyst and catalyst aging. The proposed urea-SCR system using the NH 3 sensor and applied to a test vehicle increased NO x conversion performance and improved emission robustness over that of conventional control using a NO x sensor.

New Urea-SCR Control System for Super Clean Diesel