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:
Aug. 15, 2000
Filed:
Jun. 03, 1998
Ahmed Abdelaziz Omara, Ann Arbor, MI (US);
Eleftherios Miltiadis Logothetis, Birmingham, MI (US);
Richard E Soltis, Saline, MI (US);
Ford Global Technologies, Inc., Dearborn, MI (US);
Abstract
A method of operating an oxygen sensor in the exhaust stream of an engine. The oxygen sensor includes a zirconia plate (14) mounted to two electrodes (16,18), covered with porous layers (20,22). The two porous layers (20,22) are designed to sense the two conditions of air/fuel mixture, lean and rich, by creating a delay in the sensing of the rate of transmission of oxygen through one of these layers (20,22). The method includes flowing exhaust gas over the sensor, maintaining essentially no flow of current through the leads when the exhaust gas maintains a state of rich or lean air/fuel ratio, and sensing induced emf spikes between the leads as the exhaust gas stream transitions between rich and lean air/fuel ratios.