SELF-CALIBRATING NOx SENSOR
AssigneeFord Global Technologies, LLC
InventorYi Ding
Life of this patent
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Abstract
A system for calibrating a response to an exhaust-stream NOx level in a motor vehicle is provided. The system comprises a NOx sensor that includes an electrode, a current from the electrode responsive to the exhaust-stream NOx level 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 NOx sensor response in terms of gain and offset parameters.
Claims20
A system for calibrating a response to an exhaust-stream NOx level in a motor vehicle, the system comprising:
- a NOx sensor including an electrode, a current from the electrode responsive to the exhaust-stream NOx level while a bias voltage is applied to the electrode;
- and
- 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.
A method of calibrating a response to an exhaust-stream NOx level in a motor vehicle, the motor vehicle including a NOx sensor, the method comprising:
- interrupting a bias voltage to an electrode of the NOx sensor, a current from the electrode responsive to the exhaust-stream NOx level absent said interrupting;
- and
- adjusting a motor-vehicle response to the current based at least partly on an attained voltage of the electrode during said interrupting.
A method of calibrating a response of a NOx sensor, the method comprising:
- interrupting a bias voltage to an electrode of the NOx sensor, a current from the electrode responsive to an exhaust-stream NOx level absent said interrupting;
- and
- adjusting a gain of the NOx sensor based at least partly on an attained voltage of the electrode during said interrupting.
Dependencies are inferred from the claim text.