| 摘要 |
The invention relates to a process for determining the amount of ammonia stored in a nitrogen oxide reduction catalyst 11. According to the process, the flow rates of nitrogen oxides and of ammonia feeding the catalyst 11 are determined, and, from said flow rates and from a given model, the amount of ammonia stored in the catalyst 11 is estimated. Also estimated, from said flow rates and from the given model, are the flow rates of nitrogen oxides and of ammonia leaving the catalyst 11, the overall flow rate of nitrogen oxides and ammonia is measured downstream of the catalyst 11 and the given model is corrected as a function of the difference between the overall flow rate measured and the flow rates of nitrogen oxides and of ammonia leaving the catalyst that are estimated by the model, the correction of the model depending on the sensitivity S of the measurement of the overall flow rate of nitrogen oxides and ammonia with respect to the amount of ammonia stored in the catalyst. |
