Allied Corporation

Bendix Autolite Corporation

Joseph V Bienkowski

Donald C Davis

Donald J Romime

A monitor (26) for use in a vehicle to check the operation of an oxygen sensor (20). The monitor (26) has a regulator (64) that changes the fluctuating voltage associated with a vehicle electrical system into a stable voltage source. An amplifier (68) receives an output signal from the oxygen sensor (20) and generates a buffered output signal. A comparator (70) compares the buffered output signal with a reference signal. When the buffered output signal is equal to the reference signal, the source voltage from the regulator (64) activates a diode (40) to inform an operator that the output voltage of the oxygen sensor (20) is within acceptable operating limits.

Oxygen sensor monitor

A method and apparatus for measuring the O.sub.2 content in an exhaust gas of an internal combustion engine by exposing two resistors to the exhaust gas of an internal combustion engine. The resistance of both resistors varies as a function of the temperature of the exhaust gas to which it is exposed. However, the resistance of one of the resistors also varies as a function of the oxygen content of the exhaust gas. Therefore, an electrical signal can be obtained which is a function of the O.sub.2 content of the exhaust gas, with the temperature effect of the exhaust gas on the resistor being minimized or eliminated.

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Fostoria, OH, United States of America

Joseph V Bienkowski