Measuring and testing – Internal combustion engine or related engine system or... – Compression
Reexamination Certificate
2005-03-01
2005-03-01
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Internal combustion engine or related engine system or...
Compression
C073S116070, C073S049700
Reexamination Certificate
active
06860144
ABSTRACT:
A non-intrusive method and arrangement for detecting the aging of an oxygen sensor, without increasing tailpipe emissions, is provided. The method detects an aging oxygen sensor, located between a motor vehicle engine and a catalytic converter, by sampling a series of oxygen level signals taken over a calibratable time block only when at least one engine operating condition satisfies a predetermined criterion whereunder the method will not intrude upon the engine controller's ability to minimize undesirable exhaust emissions. After a series of signal processing, the samplings are then compared to calibratable thresholds in order to determine the aging degree of the oxygen sensor.
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Booms Chris J
Carlson David J
Leisenring William E
Moote Richard K
Poublon Mark J
DaimlerChrysler Corporation
Jenkins Jermaine
Lefkowitz Edward
Smith Ralph E.
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