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NOx sensors based on mixed potential for automobiles
Technical Paper
1999-08-0205
Sector:
Event:
JSAE Spring Conference
Language:
Japanese
Abstract
The NOx sensors based on mixed potential were made by laminating YSZ green sheets, on which electrodes including an NOx-sensing electrode, an oxygen pump, a NOx conversion electrode, a Pt heater and a pair of thermocouples were printed and sintered. The exhaust gases containing NOx (mainly NO and NO2) HC, 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 NO2 by the NOx conversion electrode at the cavity. Consequently, NO and NO2 in the exhaust gases can be detected in total-NOx concentration as low as 10 ppm by the sensing electrode based on mixed potential. Practically, this sensor can detect the total-NOx concentration in the test gases and exhaust gases from gasoline engine.