SAE technical papers on CD-ROM/SAE technical paper series · 1999 · 27 citations · 4 references
EngineeringAutomotive EngineeringEnvironmental EngineeringSensorsAutomotive SensorsGas SensorsNitrogen OxidesSensor FundamentalsSensor IntegrationSensor MaterialsMixed Potential TheoryNox Formation MechanismsNox Oxidation MechanismsNox Removal Processes
<div class="htmlview paragraph">The new total-NOx sensors were made by laminating YSZ green sheets, on which electrodes including an NOx sensing electrode, an oxygen pump, an NOx conversion electrode, a Pt heater and a pair of thermocouples were printed and fired. The exhaust gas containing NOx(NO and NO<sub>2</sub>), HC and CO were introduced into the cavity inside the sensor body, then HC and CO were oxidized to non-interference gases. NO was subsequently converted to NO<sub>2</sub> by the NOx conversion electrode at the second half cavity. Consequently, NO and NO<sub>2</sub> in the exhaust can be detected in total-NOx concentration as low as 10 ppm by the sensing electrode based on the mixed potential.</div>
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