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. 29, 1989
Filed:
May. 02, 1988
Applicant:
Inventors:
Toyohei Nakajima, Wako, JP;
Toshiyuki Mieno, Wako, JP;
Assignee:
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ; F02M / ; F02D / ;
U.S. Cl.
CPC ...
123489 ; 123440 ; 204 / ; 204425 ; 204400 ;
Abstract
A method for controlling an oxygen concentration sensor in which the supply of a heater current to a heater element is started when the complete combustion of the engine is detected. The supply of a pump current to an oxygen pump element is started when an internal resistance of the heater element is determined to be in a predetermined range. The supply of the pump current is started when the temperature of the oxygen pump element and the sensor cell element becomes sufficiently high to prevent the pump current from flowing excessively, thereby preventing the generation of blackening phenomenon.