The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 1993
Filed:
Oct. 29, 1992
Applicant:
Inventor:
Arnold W Brandt, Livonia, MI (US);
Assignee:
Ford Motor Company, Dearborn, MI (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
F02M / ;
U.S. Cl.
CPC ...
123693 ; 123406 ;
Abstract
This invention provides an self-calibrating buffer amplifier for a Universal Exhaust Gas Oxygen sensor interface circuit which couples and processes a voltage signal proportional to pumping cell current to a level and reference voltage suitable for input to an A-to-D convertor. The goal of this invention is to increase the accuracy of air-to-fuel ratio control by continually correcting for the effects of offset quantities in the amplifier stage necessary to the interface circuitry. This goal is accomplished by an approach which effectively generates and subtracts these offset quantities from the processed signal.