Oxygen sensor system with a dynamic heater malfunction detector

Details Oxygen sensor system with a dynamic heater malfunction detector Oxygen sensor system with a dynamic heater malfunction detector

1992-10-28

1993-09-21

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123697, F02D 4114

Patent

active

052459799

ABSTRACT:
A heated exhaust gas oxygen sensor assembly for an internal combustion engine that changes the heater status in order to detect a malfunction of the heater. The assembly includes an oxygen sensor, heater, impedance sensor, and controller. The oxygen sensor has a sensing element and a pair of output leads. The sensing element detects the relative oxygen concentration in the exhaust gas and responsively provides an oxygen level signal on the output leads. The heater physically warms the oxygen sensor. The impedance sensor is interconnected to the output leads of the oxygen sensor and measures the impedance between them. The controller first activates and then deactivates the heater. The controller also receives the impedance signals representing the impedance of the oxygen sensor when the heater is both on and off. The controller compares these two impedance levels and, if the difference between (or ratio of) these two values fails to meet a predetermined standard, the controller issues a heater malfunction signal. The malfunction signal may then alert the driver or mechanic that a heater malfunction has been detected.

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patent: 5111792 (1992-05-01), Nagai et al.
patent: 5148795 (1992-09-01), Nagai et al.

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