Method for the dynamic monitoring of a nox sensor
AssigneeRobert Bosch GmbH
InventorsEckehard Knoefler, Torsten Handler
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Abstract
The invention relates to a method for monitoring a NOx sensor (10) having an oxygen-ion-conducting solid electrolyte and having at least one cavity (12), wherein at least one cavity (12) of the NOx sensor is flooded with a defined oxygen concentration during a self-diagnosis of the NOx sensor. The gradient of a pump current resulting therefrom is evaluated and, in the case of a deviation in comparison with reference values, possibly impaired dynamics of the NOx sensor are inferred.
Claims13
A method for monitoring a NOx sensor (10) having an oxygen-ion-conducting solid electrolyte and at least one cavity (12), the method comprising flooding, during an internal diagnosis of the NOx sensor, at least one cavity (12) of the NOx sensor with a defined oxygen concentration;
- analyzing a time curve of a resulting pump current (300, 400), wherein at least one variable representative of the time curve of the resulting pump current (300, 400), is analyzed;
- and
- inferring an impaired dynamic response of the NOx sensor (10) in response to determining a deviation of the at least one variable in comparison to one or more reference values.
(canceled)
Dependencies are inferred from the claim text.