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:
Dec. 29, 1987
Filed:
Sep. 16, 1986
Applicant:
Inventor:
Yoshiaki Kinoshita, Susono, JP;
Assignee:
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02D / ;
U.S. Cl.
CPC ...
123489 ; 123440 ; 204425 ;
Abstract
In an internal combustion engine, a heater for heating an air-fuel ratio sensor provided in the exhaust gas flow passage is controlled in accordance with a parameter of a driving condition of the engine. That is the heater for the air-fuel ratio sensor is turned ON when the parameter is not larger than a predetermined value, and the heater for the air-fuel ratio sensor is turned OFF when the parameter is larger than the predetermined value. The turning ON or turning OFF of the heater is delayed with a predetermined delay time. Thus the number of times that the heater is turned ON and OFF is decreased, thereby prolonging the life of the heater.