System and method for updating a baseline output of a gas sensor

摘要

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.

主权项

1. A method of operating a NOx sensor, wherein the sensor includes a pumping electrode configuration and a measuring electrode configuration, the method comprising:
operating in a first update operating mode responsive to determining that the NOx sensor is operating under first conditions that cause an absence of NOx in exhaust gas, the first update operating mode including removing NOx and at least a portion of O2 from the sensor; determining that the NOx sensor is operating under second conditions that cause a change in residual O2 reaching the measuring electrode configuration; and responsive to the determining, operating in a second, alternate update operating mode, the second, alternate update operating mode including,
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; andapplying a second measuring voltage across the measuring electrode configuration sufficient to electrochemically remove NOx from the sensor.