System for monitoring the performance of automotive catalysts
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United States of America Patent
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Jul 11, 1995
Grant Date -
N/A
app pub date -
Jul 5, 1994
filing date -
Jul 5, 1994
priority date (Note) -
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Abstract
This invention is directed to a system for monitoring the efficiency of a catalyst employed to convert exhaust gases containing carbon monoxide, hydrocarbons and nitrogen oxides, e.g., those generated by an internal combustion engine such as in an automobile. The system comprises a thin-film resistive device and an electrical circuit connected to said thin-film resistive device capable of determining a change in the electrical resistance of a electrically conductive material provided in the device, the electrical resistance being subject to change during conversion of said exhaust gases over the catalyst.
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