AIR-FUEL RATIO CONTROL SYSTEM IN OXIDIZER SENSOR TO USE HEAT RESISTOR

摘要

The closed circuit air fuel ratio control system using a heater resistor of an oxygen sensor comprises: a driver(10) connected to a heater resistor(R1) and for maintaining the temperature of an oxygen sensor tip at a predetermined value; an input resistor(R2); and an amplifier(20) connected to the heater resistor(R1), the input resistor(R2) and a microcomputer(3) to provide a variant value for the closed circuit air fuel ratio control to the microcomputer(3), whereby if the value of the heater resistor(R1) is over the predetermined value, it can execute the closed circuit air fuel ratio control.