Patent ID: 8186205
Filing Date: 2012-05-29
Classification: F01N,F02D,Y02T

Abstract:
1. A method of diagnosing an operation of an exhaust gas sensor that is arranged in an exhaust gas duct of a combustion engine, wherein the exhaust gas sensor controls through a control loop a parameter of a gas mixture that is supplied to the combustion engine, the method comprising: during a diagnosing period, using a displacement over time of a correcting variable for the parameter that is derived from an output signal of the exhaust gas sensor, or a course over time of the output signal of the exhaust gas sensor for the diagnosis; determining an operating state of the exhaust gas sensor in an evaluation algorithm based on the output signal of the exhaust gas sensor; and upon implementation of the evaluation algorithm, at least one of detected time periods with a minimum length, detected amounts of maximum values, and detected amounts of minimum values of the correcting variable, or for the output signal of the exhaust gas sensor, are stored in at least one counter during a release condition.