Exhaust oxygen sensing
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United States of America Patent
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-
Nov 28, 2000
Grant Date -
N/A
app pub date -
Jun 3, 1998
filing date -
Jun 3, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An exhaust gas oxygen sensor (10) mounted in the exhaust stream of an engine includes a zirconia plate (14) mounted to two electrodes (16,18), covered with porous layers (20,22). The two porous layers (20,22) are designed to sense the two conditions of air/fuel mixture, lean and rich, by creating a delay in the sensing of the rate of transmission of oxygen through one of these layers (20,22), without the need for a voltage source pumping oxygen through the sensor. A heating element (60) can be used with the sensor to reduce the light-off time of the sensor. Also, a latch 52 can be used to modify the signal from the sensor to provide for a more conventional EGO signal.
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