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. 21, 1996
Filed:
Dec. 21, 1994
Masanobu Uchinami, Himeji, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An oxygen concentration detection apparatus for an internal combustion engine is capable of starting feedback control of an air-fuel ratio in the shortest time possible after the engine has been started, thereby preventing the blackening of an oxygen concentration sensor 1, incorrect determination of the air-fuel ratio immediately after start of the current supply to a heating element 20, and damage to the oxygen concentration sensor 1 due to a temperature rise of the heating element 20 when the engine is cold started. A heating state of the heating element 20 of a variable resistance type, which heats the oxygen concentration sensor 1, is detected so that the current supply to an oxygen pumping device 18 is controlled in accordance with the detected state of the heating element 20.