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. 27, 1986
Filed:
Dec. 13, 1984
Tetsusyo Yamada, Aichi, JP;
Shintaro Hirate, Aichi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
An A/F (Air Fuel) ratio detector providing precise control of the operating A/F ratio of an internal combustion engine whether the engine is operating in the fuel-rich or fuel-lean region or at the theoretical (stoichiometric) point. The detector includes both a pump element and a sensor element, each composed of an oxygen-ion-conductive solid electrolyte having formed on both sides thereof a porous electrode. The pump and sensor elements are disposed facing one another with a small gap therebetween. A wall is disposed parallel to the sensor element on the side opposite the gap and is sealed to the solid electrolyte of the sensor element except at a base portion, thereby defining an air compartment open to the atmosphere. An electric current is passed through the pump element, and the resulting potential produced across the sensor element is taken as an indication of the operating A/F ratio.