Patent ID: 7051515

Claim:
A method for modeling a discharge phase of a nitrogen oxide (NOx)-storage catalytic converter of an internal combustion engine, including an internal combustion engine of a motor vehicle, the method comprising the steps of: subdividing said (NOx)-storage catalytic converter into an oxygen (O2)-store and a nitrogen oxide (NOx)-store; determining a reducing agent mass flow (msrg) charging said (O2)-store and said (NOx)-store; modeling said (O2)-store with a first integrator for oxygen (O2) and modeling said (NOx)-store with a second integrator for nitrogen oxide (NOx); charging said first integrator and said second integrator proportionally with said reducing agent mass flow (msrg) in accordance with an apportioning factor (fatmsre); and, determining said apportioning factor (fatmsre) in dependence upon the content (mo2sp) of said (O2)-store and the content (mnosp) of said (NOx)-store.