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. 30, 1989
Filed:
Apr. 01, 1988
Kouji Uranishi, Susono, JP;
Takaaki Itou, Mishima, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An air-fuel ratio control device comprising an electric air bleed control valve which controls the amount of air fed into the fuel passage of the carburetor so that an air-fuel ratio becomes equal to the stoichiometric air-fuel ratio. The degree of opening of the air bleed control valve is increased as an electric current fed into the air bleed control valve is increased. Fuel vapor is fed into the intake passage from the canister. An auxiliary air is also fed into the intake passage via an electric auxiliary air bleed control valve. When the supply of fuel vapor to the intake passage is started, if the electric current fed into the air bleed control valve increases and reaches the upper limit, the auxiliary air bleed control valve is opened. As a result, the electric current fed into the air bleed control valve is lowered and can move up and down so that an air-fuel ratio becomes equal to the stoichiometric air-fuel ratio.