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Patent Searching and Data


Title:
AIR-FUEL RATIO CONTROL DEVICE FOR A CARBURETOR
Document Type and Number:
WIPO Patent Application WO/2011/048871
Kind Code:
A1
Abstract:
Disclosed is an air-fuel ratio control device for an internal combustion engine. Said air-fuel ratio control device opens or closes a choke valve in accordance with a load and how open a throttle valve in a carburetor is, allowing variable fuel injection and making it possible to achieve a desired air-fuel ratio across the entire operable range (engine speed and load) of the internal combustion engine, resulting in reduced costs, cleaner exhaust gas, and improved fuel efficiency. The disclosed air-fuel ratio control device is provided with: a first stepping motor (8) that adjusts the degree of opening of a choke valve (6) in a carburetor (5) disposed on an air-intake passageway of an internal combustion engine (1); a second stepping motor (9) that adjusts the degree of opening of a throttle valve (7); and a controller (12) that obtains a desired air-fuel ratio. The controller controls the degree of opening of the choke valve (6) on the basis of changes in the speed of the internal combustion engine (1) that occur as the throttle valve (7) opens or closes, and if the speed of the internal combustion engine (1) is constant, the controller controls the degree of opening of the choke valve (6) on the basis of a map that determines the degree of opening of the choke valve (6) by the load on the internal combustion engine (1).

Inventors:
MAKI, Kazuhiro (C/O MITSUBISHI HEAVY INDUSTRIES LTD, 16-5, Konan 2-chome, Minato-k, Tokyo 15, 〒1088215, JP)
Application Number:
JP2010/064337
Publication Date:
April 28, 2011
Filing Date:
August 25, 2010
Export Citation:
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Assignee:
MITSUBISHI HEAVY INDUSTRIES, LTD. (16-5, Konan 2-chome Minato-k, Tokyo 15, 〒1088215, JP)
三菱重工業株式会社 (〒15 東京都港区港南二丁目16番5号 Tokyo, 〒1088215, JP)
International Classes:
F02M7/00; F02D9/02; F02D11/10; F02M7/12
Foreign References:
JPS63167061A
JP2008255881A
JP2006329095A
JPS51144833A
JPS5187628A
JP2007023838A
Other References:
See also references of EP 2492485A1
Attorney, Agent or Firm:
TAKAHASHI, MATSUMOTO & PARTNERS INTELLECTUAL PROPERTY CORP. (Room 1003, Ambassador Roppongi Buildings 16-13, Roppongi 3-chome, Minato-k, Tokyo 32, 〒1060032, JP)
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