| 摘要 |
In an arrangement, wherein a post-catalytic converter lambda probe is arranged downstream of a catalytic converter having an oxygen store, and wherein both the oxygen store and the post-catalytic converter lambda probe can be subject to aging, a time delay in the reaction of the post-catalytic converter lambda probe with an aged oxygen store to the air-fuel ratio is measured when the associated internal combustion engine operates in an overrun mode. This time delay can be used to determine the oxygen storage capacity. If the oxygen store has not yet aged, a coarse estimate of the time delay is sufficient. The coarsely determined time delay is hereby used to define a coarse limit value in conjunction with a time integral or time duration. |
