Wide band lambda probe having improved starting behaviour

Details Wide band lambda probe having improved starting behaviour Wide band lambda probe having improved starting behaviour

2006-10-03

2006-10-03

Wachsman, Hal (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Chemical analysis

C702S023000, C702S031000, C702S064000, C204S424000

Reexamination Certificate

active

07117099

ABSTRACT:
In a method and a control device for operating a broadband lambda sensor, the oxygen concentration of an exhaust gas is determined based on a comparison of a Nernst voltage with a reference voltage having a nominal value; a pump current is injected into a cavity of a pump cell if a deviation is present, an electric voltage present at the pump cell being regulated in such a manner that lambda=1 prevails in the cavity, the pump current being a measure for the value of lambda in the exhaust gas; and, in order to avoid control interference in the start phase of the engine or in the cold phase of the sensor, the Nernst voltage is maintained close to the reference voltage, using a pilot control, until the Nernst voltage is an actual measure for the oxygen concentration in the cavity of the pump cell.

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