Self-calibrating NO x sensor

Details Self-calibrating NO x sensor Self-calibrating NO x sensor

2011-03-08

2011-03-08

Noland, Thomas P (Department: 2856)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C073S001070, C073S114710, C123S685000, C123S693000

Reexamination Certificate

active

07900614

ABSTRACT:
A system for calibrating a response to an exhaust-stream NOxlevel in a motor vehicle is provided. The system comprises a NOxsensor that includes an electrode, a current from the electrode responsive to the exhaust-stream NOxlevel while a bias voltage is applied to the electrode. The system further comprises a controller configured to interrupt the bias voltage and to adjust a motor-vehicle response to the current based at least partly on an attained voltage of the electrode while the bias voltage is interrupted. Other embodiments provide a method of calibrating a NOxsensor response in terms of gain and offset parameters.

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