Power plants – Internal combustion engine with treatment or handling of... – Having sensor or indicator of malfunction – unsafeness – or...
Reexamination Certificate
2006-06-06
2006-06-06
Tran, Binh Q. (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
Having sensor or indicator of malfunction, unsafeness, or...
C060S274000, C060S276000, C701S103000, C701S109000
Reexamination Certificate
active
07055310
ABSTRACT:
A high precision deterioration determination device for an exhaust gas purifier of an engine is provided. The engine includes an exhaust gas purifier disposed in an exhaust pipe of the engine, and a downstream exhaust gas sensor disposed in the exhaust pipe on the downstream of the purifier for generating outputs corresponding to components of an exhaust gas. The electronic control unit controls an air/fuel ratio of the engine to a predetermined value based on the outputs of the downstream exhaust gas sensor. The control unit is programmed to perform a non-linear filtering to extract rectangle-shaped waveform components from the outputs of the downstream exhaust gas sensor. The control unit subtracts the rectangle-shaped waveform components from the sensor outputs to extract noise components representing a degree of the catalyst deterioration.
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patent: 5557933 (1996-09-01), Numata et al.
patent: 6006153 (1999-12-01), Stander et al.
patent: 6301881 (2001-10-01), Kumar
patent: 6694243 (2004-02-01), Shi et al.
patent: 2003-193898 (2003-07-01), None
Arent & Fox PLLC
Honda Motor Co. Ltd.
Tran Binh Q.
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