| 摘要 |
According to one exemplary embodiment, an apparatus is disclosed for estimating an NOx conversion efficiency of an SCR catalyst. The apparatus includes a catalyst degradation module for determining an SCR catalyst degradation factor and a NOx concentration module for determining an SCR catalyst inlet NOx concentration based on an interpretation of at least one NOx detector signal. Additionally, the apparatus includes an NH3 concentration module for determining an SCR catalyst inlet NH3 concentration, a temperature module for determining an SCR catalyst bed temperature of the at least one SCR catalyst, and a space velocity (SV) module for determining an exhaust gas SV for the SCR catalyst. A NOx conversion efficiency module calculates a NOx conversion efficiency value based at least partially on the SCR catalyst degradation factor, the SCR catalyst inlet NOx concentration, the SCR catalyst inlet NH3 concentration, the exhaust gas SV, and the SCR catalyst bed temperature. |
