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:
Nov. 17, 1987
Filed:
Mar. 25, 1986
Masahiko Asakura, Tokorozawa, JP;
Tomohiko Kawanabe, Utsunomiya, JP;
Noritaka Kushida, Tokyo, JP;
Hiroshi Hasebe, Hatogaya, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An oxygen concentration sensing device for use in an air-fuel ratio control system of an internal combustion engine includes a pair of solid electrolyte members having oxygen ion permeability which are disposed in the exhaust gas of the engine and arranged to face each other forming a predetermined gap portion between them. Each of the solid electrolyte members is provided with a pair of electrodes. One of the solid electrolyte members is operative as an oxygen pump element when a predetermined constant electric current is supplied across the electrodes thereof. An electric potential developed across the electrodes of the other one of the solid electrolyte members operative as a cell element is supplied to a comparing means in which the input signal from the solid electrolyte member is compared with a predetermined reference potential and a result of comparison is provided as an oxygen concentration detection signal. In an application of the oxygen concentration sensing device according to the invention in an air-fuel ratio control system, the magnitude of the constant current supplied to the oxygen pump element is varied with the value of a target air-fuel ratio which is controlled in response to various operational parameters of the engine.