Inlet NOx and NH 3 Concentration Estimation for Diesel-engine SCR Systems by Combining Data-Driven Model and Unbiased FIR Filter

Selective catalytic reduction (SCR) systems have been widely used in diesel engine applications. In an SCR system, input NOx and NH 3 concentration information are of critical importance for the urea dosage controller design and system fault detection. Generally, the NOx and NH 3 concentration are obtained by physical sensors. However, the physical sensors do not only increase the cost of overall system, but also induce measurement delays. To …