Patent ID: 8434294
Filing Date: 2013-05-07
Classification: F01N,Y02T

Abstract:
1. A method for determining a dynamic time duration for exhaust gas probes of an internal combustion engine having at least one cylinder and an exhaust gas tract, in which an exhaust gas catalytic converter, a first exhaust gas probe upstream of the exhaust gas catalytic converter and a second exhaust gas probe downstream of the exhaust gas catalytic converter are disposed, comprising: charging the exhaust gas catalytic converter with oxygen until the converter is saturated; setting a predetermined first rich air/fuel ratio in a combustion chamber of the cylinder; determining a first oxygen storage capacity value as a function of first measurement signals of the first and second exhaust gas probes; charging the exhaust gas catalytic converter with oxygen until the converter is saturated; setting a predetermined second rich air/fuel ratio in the combustion chamber of the cylinder; determining a second oxygen storage capacity value as a function of second measurement signals of the first and second exhaust gas probes; and determining a dynamic time duration as a function of the first and second oxygen storage capacity values.