Heater controller for an air-fuel ratio sensor

Details Heater controller for an air-fuel ratio sensor Heater controller for an air-fuel ratio sensor

1996-10-18

1998-03-24

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219205, 219207, 219508, 123697, H05B 102

Patent

active

057315701

ABSTRACT:
A heater control system for an air-fuel ratio sensor is shown to prevent the sensor from being cooled during an extended idling operation after high-load running. An oxygen concentration detecting element of an air-fuel ratio sensor is heated by a heater installed in the sensor, and its temperature is controlled to about 650.degree. C. When a radiator cooling fan functions during idling or low-speed running after high-load running, a controller detects the functioning of the fan and increases an electric power supplied to the heater. A heater resistance detector detects a resistance of the heater. A storage device stores the detected heater resistance when it is determined that a temperature of the heater is stable based on an engine operating condition. Electric power supplied to the heater is increased in accordance with the difference between the detected resistance of the heater and the stored resistance. A heater controller thus prevents the air-fuel ratio sensor from being cooled by the fan to the point that detection accuracy of the sensor would deteriorate.

REFERENCES:
patent: 5144916 (1992-09-01), Yoshida et al.
patent: 5353775 (1994-10-01), Yamashita et al.
patent: 5544640 (1996-08-01), Thomas et al.

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