Power plants – Internal combustion engine with treatment or handling of... – Having sensor or indicator of malfunction – unsafeness – or...
Reexamination Certificate
2006-10-31
2009-10-27
Denion, Thomas E (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
Having sensor or indicator of malfunction, unsafeness, or...
C060S285000
Reexamination Certificate
active
07607288
ABSTRACT:
A catalyst deterioration diagnosis apparatus for an internal combustion engine, comprising means for subjecting output signals of an upstream-side and a downstream-side O2sensors to weighted correction processes corresponding to output levels, means for calculating amplitude magnitudes of the output signals of the upstream-side and the downstream-side O2sensors after the weighted correction processes, and time integral values of differences between predetermined signals and the output signals of the upstream-side and downstream-side O2sensors after the weighted correction processes, means for calculating a deterioration diagnosing parameter on the basis of the amplitude magnitudes and the time integral values, means for deciding deterioration of a catalyst converter on the basis of a result of a comparison between the calculated deterioration diagnosing parameter and a predetermined deterioration decision threshold value, and warning means for issuing warning when the catalyst deterioration has been decided.
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Miyasako Masakazu
Nakano Makoto
Wada Koji
Denion Thomas E
Matthias Jonathan
Mitsubishi Electric Corporation
Sughrue & Mion, PLLC
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