Method and apparatus for controlling heater of a gas sensor

Details Method and apparatus for controlling heater of a gas sensor Method and apparatus for controlling heater of a gas sensor

1985-02-05

1987-11-24

Tung, T.

Chemistry: electrical and wave energy

Processes and products

60276, 123440, 204408, 204421, 204424, G01N 2746

Patent

active

047087773

ABSTRACT:
Energization of a heater built in a gas sensor, such as an oxygen sensor, used in an air/fuel ratio control system of an internal combustion engine, is controlled to maintain the temperature of the same within a desired range. The temperature of the heater is calculated using a measured resistance value of the heater, and engine parameters used for estimating a specific engine operating condition. To this end operating state of the engine is first detected to determine whether it is possible to estimate the actual temperature of the heater, and when possible, a reference resistance value of the heater at a reference temperature such as 0.degree. K. or 0.degree. C. is caluclated using estimated heater temperature and a measured resistance value. Once the initial resistance value is obtained, this is used to calculate actual heater temperature using measured resistance value and a predetermined temperature coefficient.

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