Oxygen sensor output correction apparatus for internal...

Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant

Reexamination Certificate

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C701S114000, C123S674000

Reexamination Certificate

active

07606654

ABSTRACT:
A correction apparatus for correcting an error in an output of an oxygen sensor such as an A/F sensor installed in an exhaust pipe of an internal combustion engine to measure the concentration of oxygen contained in exhaust gas. The apparatus works to determine a given parameter correlating with an actual concentration of oxygen within the exhaust pipe after start of a fuel cut event and also determine an oxygen concentration-corresponding output based on the given parameter which is a parameter corresponding to an output of the oxygen sensor considered to represent the actual concentration of oxygen correctly. The apparatus samples an output of the oxygen sensor during the fuel cut event and determines a correction factor based on the sampled output of the oxygen sensor and the oxygen concentration-corresponding output for use in correcting an output of the oxygen sensor when the engine is undergoing no fuel cut.

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patent: 6874490 (2005-04-01), Surnilla
patent: 7457700 (2008-11-01), Frauenkron et al.
patent: 2002/0022921 (2002-02-01), Nakagawa et al.
patent: 2004/0162667 (2004-08-01), Abe et al.
patent: 2005/0216175 (2005-09-01), Takahashi et al.
patent: 2006/0212210 (2006-09-01), Daneau et al.
patent: 2006/0236990 (2006-10-01), Annoura et al.
patent: 2007/0023020 (2007-02-01), Yoshidome
patent: 2003-003903 (2003-01-01), None
patent: 2007-032466 (2007-02-01), None

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