Patent ID: 7849671
Filing Date: 2010-12-14
Classification: F01N,Y02T

Abstract:
1. A method for determining an oxygen storage capacity of an exhaust gas catalytic converter of an internal combustion engine having cylinder and an exhaust gas tract where 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 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 the measurement signals of the first and second exhaust gas probes; and determining a corrected oxygen storage capacity value as a function of the first and second oxygen storage capacity values.