System and method for updating a baseline output of a gas sensor
First Claim
1. An apparatus, comprising:
- a gas sensor configured to measure an analyte concentration in a gas mixture, the sensor including a pumping electrode configuration and a measuring electrode configuration; and
a controller in communication with the gas sensor, wherein the controller is configured to;
operate the gas sensor in a first mode in which a first, lower pumping potential is applied across the pumping electrode configuration to electrochemically remove an interfering compound from the sensor without electrochemically removing the analyte from the sensor, and a measuring potential is applied across the measuring electrode configuration to electrochemically remove the analyte from the sensor; and
operate the gas sensor in a second mode in which a second, higher pumping potential sufficient to electrochemically remove the analyte from the sensor is applied to the pumping electrode configuration.
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Abstract
A method of operating a gas sensor is disclosed, wherein the sensor includes a pumping electrode configuration and a measuring electrode configuration, and wherein the method includes operating the sensor in a first mode in which a first, lower pumping potential sufficient to electrochemically remove an interfering compound from the sensor without electrochemically removing the analyte from the sensor is applied across the pumping electrode configuration and a measuring potential sufficient to electrochemically remove the analyte from the sensor is applied across the measuring electrode configuration; and operating the sensor in a second mode in which a second, higher pumping potential sufficient to electrochemically remove the analyte from the sensor is applied to the pumping electrode configuration.
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Citations
31 Claims
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1. An apparatus, comprising:
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a gas sensor configured to measure an analyte concentration in a gas mixture, the sensor including a pumping electrode configuration and a measuring electrode configuration; and
a controller in communication with the gas sensor, wherein the controller is configured to;
operate the gas sensor in a first mode in which a first, lower pumping potential is applied across the pumping electrode configuration to electrochemically remove an interfering compound from the sensor without electrochemically removing the analyte from the sensor, and a measuring potential is applied across the measuring electrode configuration to electrochemically remove the analyte from the sensor; and
operate the gas sensor in a second mode in which a second, higher pumping potential sufficient to electrochemically remove the analyte from the sensor is applied to the pumping electrode configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31)
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16. A method of operating a NOx sensor, wherein the sensor includes a pumping electrode configuration and a measuring electrode configuration, the method comprising:
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applying a first measuring voltage across the measuring electrode configuration sufficient to electrochemically remove O2 from the sensor without electrochemically removing NOx from the sensor; and
applying a second measuring voltage across the measuring electrode configuration sufficient to electrochemically remove NOx from the sensor. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A method of operating a gas sensor configured to measure an analyte concentration in the exhaust gas of a vehicle engine, the sensor including a pumping electrode configuration and a measuring electrode configuration, the method comprising:
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operating the sensor in a first mode in which a first, lower pumping potential sufficient to electrochemically remove an interfering compound from the sensor without electrochemically removing the analyte from the sensor is applied across the pumping electrode configuration and a measuring potential sufficient to electrochemically remove the analyte from the sensor is applied across the measuring electrode configuration; and
operating the sensor in a second mode in which a second, higher pumping potential sufficient to electrochemically remove the analyte from the sensor is applied to the pumping electrode configuration. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification