Measuring and testing – Internal combustion engine or related engine system or... – Exhaust system
Reexamination Certificate
2011-04-26
2011-04-26
McCall, Eric S (Department: 2855)
Measuring and testing
Internal combustion engine or related engine system or...
Exhaust system
C073S114770
Reexamination Certificate
active
07930932
ABSTRACT:
A NOx sensor abnormality detection device senses a NOx concentration and an O2 concentration from output signals of a NOx sensor and calculates an estimated NOx concentration from the O2 concentration when an engine is in a steady operation state, when a zero point of the NOx concentration is sensed, and when an O2 sensing section of the NOx sensor is normal. The NOx sensor abnormality detection device calculates a sensed inclination and an estimated inclination of a NOx concentration output characteristic of the NOx sensor based on the sensed NOx concentration, the sensed O2 concentration and the estimated NOx concentration calculated from the O2 concentration. The NOx sensor abnormality detection device determines that the NOx sensor is faulty when an absolute value of a difference between the sensed inclination and the estimated inclination is larger than a predetermined value.
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patent: 2009/0139212 (2009-06-01), Miwa
patent: 2009/0151425 (2009-06-01), Miwa
patent: 2009/0173140 (2009-07-01), Sumitani
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Kariya Yasuhiro
Nakamura Kanehito
Denso Corporation
McCall Eric S
Nixon & Vanderhye PC
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