Continental Automotive Gmbh

Stefan Barnikow

Norbert Sieber

Michaela Schneider

Ekkehart-Peter Wagner

Johannes Scheuerer

Frank Friedhof

A device for diagnosing an exhaust gas sensor, in particular a linear oxygen probe, for an internal combustion engine. A diagnostic unit is configured to control a first and a second current source in a coordinated manner in order to generate a first and a second current. Each of the currents has a predefined polarity sign, and is designed to determine the first and/or second and/or third voltages applied at a first and/or second and/or third terminal when first and second currents flow and put the amounts of the voltages in relation to the coordinated currents such that line interruptions and/or short circuits can be detected at the first and/or second and/or third terminal.

Device and method for diagnosing an exhaust gas sensor

In a method for heating a gas sensor (), in particular an exhaust gas sensor for an exhaust system () of a motor vehicle (), a temperature of the gas sensor () is determined and the heating process is influenced as a function of the temperature.

Method for heating a gas sensor

In relation to a jump (SP_J_LR) from a lean air-to-fuel ratio to a richer air-to-fuel ratio, a measurement signal of the exhaust gas probe is detected after a predetermined lean-to-rich delay (t_R) as a lean-to-rich signal value (SV_LR) and is placed in relation to a lean-to-reference signal value (L_REF). In relation to a jump (SP_J_RL) from a richer air-to-fuel ratio to a leaner air-to-fuel ratio, the procedure is performed equivalently. Depending on the lean-to-rich and lean-to-rich signal value put in relation, either an asymmetrically aged or non-asymmetrically aged exhaust gas probe is detected.

Method and device for monitoring an exhaust gas probe

Depending on a trim controller diagnosis, a suspicion marker for an asymmetric ageing of the exhaust gas probe is allocated either a 'true' value or a 'false' value and, if the value of the suspicion marker is &#x201c;true&#x201d;, a dynamic diagnosis will be performed based on the exhaust gas probe's measuring signal, on the basis of the results of which diagnosis either an asymmetrically aged or a non-asymmetrically aged exhaust gas probe will be detected.

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Bad Abbach, Germany

Stefan Barnikow