Patent ID: 6792928
Filing Date: 2004-09-21
Classification: F02D

Abstract:
A degradation determining system for an exhaust gas sensor, for determining degradation of the exhaust gas sensor based on an output from the exhaust gas sensor, the exhaust gas sensor outputting a signal indicative of an amount of a predetermined component contained in exhaust gases emitted from an internal combustion engine into an exhaust passage thereof,the degradation determining system comprising: determining input-generating means for generating a determining input for determining degradation of the exhaust gas sensor; modulation output-generating means for generating a modulation output by modulating the generated determining input, using any one of a &Dgr;&Sgr; modulation algorithm, a &Sgr;&Dgr; modulation algorithm, and a &Dgr; modulation algorithm; control means for controlling an amount of fuel to be injected into the engine, according to the generated modulation output; and degradation determining means for determining degradation of the exhaust gas sensor based on the output from the exhaust gas sensor delivered when the amount of fuel to be injected is controlled by said control means.