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:
Mar. 26, 2002
Filed:
Nov. 30, 1998
Applicant:
Inventors:
Richard E. Soltis, Saline, MI (US);
Tie Wang, Troy, MI (US);
Assignee:
Ford Global Technologies, Inc., Dearborn, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N 7/00 ; G01N 3/3497 ;
U.S. Cl.
CPC ...
G01N 7/00 ; G01N 3/3497 ;
Abstract
A gas sensor deterioration monitor, particularly suited for use in an exhaust stream from an internal combustion engine. Under certain engine operating conditions, the output signal from the sensor is transformed through a Fourier Transformation into a frequency domain signal. Ratios of the magnitudes of certain odd and even harmonics are compared to corresponding reference values for a new sensor. Deviations beyond certain limits indicate a sensor that has deteriorated substantially.