Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1997-06-17
1998-07-21
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123697, 204425, 219497, G01N 27416, F02D 4114
Patent
active
057822271
ABSTRACT:
An apparatus, for controlling a heater for heating an air-fuel ratio sensor, which is capable of preventing an excessive temperature rise of the heater after the air-fuel ratio sensor has been activated. After engine start-up, power is continuously supplied to the heater 112 until its temperature reaches about 1100.degree. C. A basic power is determined so that the heater temperature is maintained at 1100.degree. C. after reaching 1100.degree. C., and so that the temperature of a sensing element 111 is maintained at 710.degree. C. after the air-fuel ratio sensor has been activated. The basic power is corrected in increasing direction using an auxiliary power calculated as a function of coolant temperature. After the air-fuel ratio sensor has been activated, if the increased power exceeds the 1100.degree. C. basic power, the power is limited below the 1100.degree. C. base power, to prevent the heater being damaged due to an excessive temperature rise of the heater.
REFERENCES:
patent: 5656190 (1997-08-01), Aoki
Argenbright Tony M.
Toyota Jidosha & Kabushiki Kaisha
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