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. 01, 2000
Filed:
Apr. 22, 1998
Denso Corporation, , JP;
Abstract
A detecting unit of an oxygen sensor as an A/F sensor has a solid electrolyte layer and a diffusion resistance layer and generates a current value according to the concentration of oxygen in an exhaust gas by applying a voltage across electrodes on an exhaust gas side and an atmosphere side of the solid electrolyte layer. An oxygen supply/exhaust unit has a solid electrolyte layer and a pair of electrodes formed on both faces of the solid electrolyte layer, and supplies oxygen near to the electrode on the atmosphere side of the detecting unit or exhausts oxygen near the electrode. A control unit controls, in response to a limit current value detected by a current detection unit, the amount of supply or exhaust of oxygen of the oxygen supply/exhaust unit on the basis of the detected current value. A control target value of a current flowing in the solid electrolyte layer is variably set so that amount of oxygen moving in the solid electrolyte layers are equal, thereby controlling the amount of supply or exhaust of oxygen of the oxygen supply/exhaust unit.