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:
Oct. 08, 2002
Filed:
Feb. 17, 2000
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
In an engine intake A/F ratio control system in an outboard engine system, a secondary air passage (P) for supplying secondary air for regulating the A/F ratio of an air-fuel mixture is connected to a carburetor ( ) in an intake system of an engine (E), and a duty control valve ( ) is connected to the secondary air passage (P). A duty control unit ( ) is connected to the duty control valve ( ) for controlling the duty ratio of a pulse applied to a coil ( ) of the duty control valve ( ), and an LAF sensor ( ) is mounted to an exhaust system for detecting an A/F ratio of an exhaust gas to input a detection signal proportional to the A/F ratio of the exhaust gas to the duty control unit ( ). Thus, in any of a case when the tolerance of the purifying rate of the catalytic converter is set relatively widely with an engine output taken into consideration to a certain extent, and a case when the set range is shifted to a rich side of the A/R ratio with the engine output taken into serious consideration, the A/F ratio of the exhaust gas can be controlled properly to a desired target value.