Apparatus and method for controlling oxygen sensor heating

Details Apparatus and method for controlling oxygen sensor heating Apparatus and method for controlling oxygen sensor heating

1998-10-15

1999-11-02

Raevis, Robert

Measuring and testing

Gas analysis

Gas of combustion

F02D 4114

Patent

active

059748575

ABSTRACT:
A sensing element of an oxygen sensor is controlled to keep a target impedance for maintaining activation temperature of the oxygen sensor. As the sensing element deteriorates, its internal impedance increases and power supply to a heater for heating the sensing element increases. The oxygen sensor temperature rises excessively above an activation temperature. To restrict excessive temperature rise, the target impedance is altered when the supply power to the heater exceeds a predetermined reference. The target impedance may be increased with increase in the power supply to the heater. Alternatively, the heater supply power is limited to a predetermined maximum for restricting excessive temperature rise.

REFERENCES:
patent: 4543176 (1985-09-01), Harada et al.
patent: 5524472 (1996-06-01), Hotzel
patent: 5544640 (1996-08-01), Thomas et al.
patent: 5709198 (1998-01-01), Sagisaka et al.

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