| 摘要 |
<p>The invention relates to a method for regenerating a nitrogen oxide trap in the exhaust gas system of an internal combustion engine having a device for influencing the amount of fuel injected, wherein the amount of fuel injected is varied for the purpose of initiating or ending a regeneration cycle carried out with a rich air/fuel ratio. The regeneration cycles are only carried out if the amount of the nitrogen oxide picked up by the nitrogen oxide trap has exceeded a predetermined value. This amount is determined by integration of a nitrogen oxide pick-up rate determined by a functional relationship. The threshold value is adapted to the ageing of the catalytic converter and of the nitrogen oxide trap. For further saving of fuel the nitrogen oxide trap is regenerated on transition from stoichiometric to lean mixture operation.</p> |
