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Air to fuel ratio sensor is used for emission control system of three-way catalyst, and constitutes the important functional part of combustion control system.For further precise combustion control application, universal air to fuel ratio heated exhaust gas oxygen sensor (UEGO sensor) has been developed.This paper introduces heater control system for constant element temperature of UEGO sensor.By the heater wattage feedback control of sensing cell impedance, the change of sensor element temperature is decreased.

Air to Fuel Ratio Sensor for Internal Combustion Engine Control System