Chemistry: electrical and wave energy – Apparatus – Electrolytic
Reexamination Certificate
2005-06-28
2009-08-25
Olsen, Kaj K (Department: 1795)
Chemistry: electrical and wave energy
Apparatus
Electrolytic
C204S406000, C204S410000, C204S424000, C205S784500
Reexamination Certificate
active
07578914
ABSTRACT:
A gas concentration measuring apparatus for use in air-fuel ratio control of motor vehicle engines is provided which is designed to determine the concentrations of oxygen at different resolutions within a wide and a narrow range using a first and a second sensor signal which are amplified by first and second operational amplifiers at different amplification factors. The apparatus samples values of the first sensor signal at different concentrations of oxygen to find an output characteristic error of the first operational amplifier and determines an actual concentration of oxygen to calculate an output characteristic error of the second operational amplifier using the one of the first operational amplifier and the actual concentration of oxygen. This permits values of the first and second sensor signals to be corrected so as to compensate for the output characteristics of the first and second operational amplifiers.
REFERENCES:
patent: 4915813 (1990-04-01), Nakajima et al.
patent: 5980710 (1999-11-01), Kurokawa et al.
patent: 6226861 (2001-05-01), Kurokawa et al.
patent: 11-37971 (1999-02-01), None
Kawase Tomoo
Kurokawa Eiichi
DENSO Corporation
Nixon & Vanderhye P.C.
Olsen Kaj K
Salzman Kourtney R
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