| 摘要 |
The invention relates to a method for operating an exhaust gas purification system (1) for purifying an exhaust gas of an internal combustion engine, according to which, in a diagnostic operation, in directly successive operating phases of the internal combustion engine in both lean-mixture and rich-mixture operating mode, the ammonia storage capacity of an ammonia SCR catalyst (7), the oxygen storage capacity of a NOx storage catalyst (8) and optionally the NOx storage capacity of the NOx storage catalyst (8) are detected by interpretation of the signals of a first and a second exhaust gas sensor (S1, S2). |
