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. 21, 1989
Filed:
Sep. 02, 1987
Minoru Ohsuga, Katsuta, JP;
Yoshishige Oyama, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The oxygen is supplied the diffusion resistor (3) for a specified period of time during operation so as to oxidize the contaminate particles (6) adhering to the diffusion resistor (3), when the solid electrolyte (2) is impressed a voltage by the power source (8) so as to move the oxygen from the solid electrolyte (2) to the diffusion resistor (3). For a specified period during operation, such as during a certain period after ignition key is switched on, during the rich air-fuel ratio operation, during idling, or during warmup operation at starting, the oxygen is supplied to the diffusion resistor (3). It is possible to provide the air-fuel ratio sensor (1) which has no output variation due to degradation over long period of use by removing the contaminated particles (6).