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:
Jan. 17, 1978
Filed:
Oct. 08, 1976
Applicant:
Inventor:
Bonnosuke Takamiya, Jyoyo, JA;
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
F02M / ; F01N / ; F02B / ;
U.S. Cl.
CPC ...
1231 / ; 123 / ; 123 / ; 1231 / ; 1231 / ; 123127 ; 60274 ; 60278 ;
Abstract
An automotive multicylinder internal combustion engine is liable to emit noxious gases under medium and low load conditions. Such air-polluting emissions as hydrocarbons, carbon monoxide and oxides of nitrogen are effectively reduced by supplying a rich mixture with air-fuel ratio of approximately 12 to 14 to a group of its cylinders, and a lean mixture with air-fuel ratio of approximately 17 to 20 to the remaining cylinders. While under high load conditions, substantially the same mixture with air-fuel ratio of approximately 13 to 15 is supplied to all the cylinders to prevent a drop in engine output and improve fuel economy.