1981-02-01

Experimental Analysis of ZrO 2 Oxygen Sensor Transient Switching Behavior 810380

An experimental analysis was performed on the transient switching behavior of ZrO2 exhaust gas oxygen sensors. Sensor response delay time and voltage switching rate were investigated as a function of temperature and air-fuel ratio. A theoretical study was first conducted from which mathematical equations were derived describing the delay time and switching rate. Extensive experimental testing was then carried out using a program-controlled functional tester. Sensors of three different forms were tested at temperatures ranging from 780°C down to 170°C with nine different air-fuel ratio excursions across stoichiometry. Test data were further analyzed and the theoretical equations verified.

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