Oxygen sensor system with an automatic heater malfunction detect

Details Oxygen sensor system with an automatic heater malfunction detect Oxygen sensor system with an automatic heater malfunction detect

1992-10-28

1993-07-20

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123697, F02D 4114

Patent

active

052284263

ABSTRACT:
A heated exhaust gas oxygen sensor assembly that automatically detects whether the heater in the assembly is malfunctioning. The assembly includes an oxygen sensor, heater, impedance sensor, and controller. The oxygen sensor detects the relative oxygen concentration in the exhaust gas of an internal combustion engine and issues signal along a pair of output leads. The heater physically warms the oxygen sensor. The impedance sensor is interconnected to the output leads of the oxygen sensor and provides an impedance measurement to the controller. The controller compares the impedance to a predetermined threshold value to judge the effect of the heater in physically warming the sensor. If the impedance is above a predetermined threshold, the controller determines that the heater is not operating properly and issues an alarm signal.

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patent: 4938194 (1990-07-01), Kato et al.
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patent: 5090387 (1992-02-01), Mayer et al.
patent: 5111792 (1992-05-01), Nagai et al.
patent: 5148795 (1992-09-01), Nagai et al.

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