Control device for heater for oxygen sensor operative to correct target resistance with reference to standard power supply thereto
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKouichi Hoshi, Masaru Goudo, Mitsuhiro Suzuki, Ritsuo Masaki, Akira Hashizume, Hidemi Ohnaka
Life of this patent
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Abstract
For controlling supply of electric power to a heater for an oxygen sensor for detecting oxygen in an exhaust system of an internal combustion engine so as to maintain the electric resistance of the heater to a target value therefor, the target value is corrected based upon detection of the amount of electric power supplied to the heater so that difference between the detected amount of electric power supplied to the heater and a standard value therefor is cancelled.
Claims10
A control device for controlling supply of electric power to a heater for an oxygen sensor for detecting oxygen in an exhaust system of an internal combustion engine for a vehicle, said control device comprising a means for detecting electric resistance of said heater and controlling said supply of electric power so as to maintain the detected electric resistance at a target value therefor, further comprising a means for detecting a predetermined operating condition of the engine, a means for detecting the amount of electric power supplied to said heater when the engine is operating at said predetermined operating condition, and a means for modifying said target value for the electric resistance of said heater so as to cancel difference between said detected value of said supply of electric power to said heater and a standard value therefor.
Dependencies are inferred from the claim text.