| 摘要 |
The invention relates to a method for diagnosing (200) a nitrogen oxide trap associated with an internal combustion engine, said trap being capable of reducing the nitrogen oxides stored therein by reacting with fuel from the engine during a step (120, 130) of regenerating the trap, said regeneration step (120, 130) being initiated by switching the engine setting to rich mix, in which the torque of the engine results from the injection of at least one main amount of fuel, and the fuel for reducing the nitrogen oxides results from the injection of a secondary amount of fuel, said method comprising a step of determining (230) the mass of reducing agents (Mred) consumed during a regeneration step, and a step (240) of comparing said mass (Mred) with a fault threshold (S) below which it is established that the trap is faulty. |
