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Patent Searching and Data


Title:
AIR-FUEL RATIO CONTROL DEVICE FOR CARBURETOR
Document Type and Number:
Japanese Patent JP2011089471
Kind Code:
A
Abstract:

To provide an air-fuel ratio control device for an internal combustion engine, in which open/close drive of a choke valve is performed according to opening and a load of a throttle valve of a carburetor to allow variable fuel jet, so that a desired air-fuel ratio is achieved in a whole operable range (a speed and a load) of the internal combustion engine to reduce a cost, clean exhaust gas, and improve fuel economy.

The air-fuel ratio control device for a carburetor includes: a first stepping motor 8 performing a drive control of opening of the choke valve 6 of the carburetor 5 disposed to an intake path of the internal combustion engine 1; a second stepping motor 9 performing a drive control of opening of the throttle valve 7; and a controller 12 performing an opening control of the choke valve 6 based on change in speed of the internal combustion engine 1 along with the opening of the throttle valve 7, and providing the desired air-fuel ratio, by performing the opening control of the choke valve 6 based on a map determining the opening of the choke valve 6 according to the load of the internal combustion engine 1 when the speed of the internal combustion engine 1 is constant.


Inventors:
Maki, Kazuhiro
Application Number:
JP2009000243549
Publication Date:
May 06, 2011
Filing Date:
October 22, 2009
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
F02M7/00; F02D9/02; F02D11/10; F02M7/12
Attorney, Agent or Firm:
特許業務法人 高橋松本&パートナーズ