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Title:
ENGINE CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2012/053587
Kind Code:
A1
Abstract:
An engine control method for controlling an engine when the calorific value per unit volume of fuel changes is provided with a step for controlling the flow rate of an air-fuel mixture such that the actual value of an output matches the target value of the output, a step for controlling the degree of opening of a fuel control valve such that the actual value of the output, the actual value of the degree of opening of the fuel control valve, and the actual value of the flow rate of the air-fuel mixture satisfy a first correlation among the output, the degree of opening of the fuel control valve, and the air-fuel ratio (S6-S9), a step for detecting the actual value of the number of rotations (S11), and a step for controlling the ignition timing such that the actual value of the output, the actual value of the number of rotations, the actual value of the calorific value specified by the actual value of the air-fuel ratio, and the target value of the ignition timing satisfy a second correlation (S13), the first correlation is set such that the air excess ratio is maintained at a predetermined value by changing the air-fuel ratio according to the change of the theoretical air-fuel ratio due to the change of the calorific value, and the second correlation is set such that the combustion thermal efficiency is maintained to a maximum when the air excess ratio is maintained at the predetermined value.

Inventors:
HAGIWARA, Ryoichi (1-32, Chayamachi, Kita-ku, Osaka-sh, Osaka 13, 〒5300013, JP)
萩原 良一 (〒13 大阪府大阪市北区茶屋町1番32号 ヤンマー株式会社内 Osaka, 〒5300013, JP)
NAKAZONO, Toru (1-32, Chayamachi, Kita-ku, Osaka-sh, Osaka 13, 〒5300013, JP)
中園 徹 (〒13 大阪府大阪市北区茶屋町1番32号 ヤンマー株式会社内 Osaka, 〒5300013, JP)
Application Number:
JP2011/074148
Publication Date:
April 26, 2012
Filing Date:
October 20, 2011
Export Citation:
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Assignee:
YANMAR CO., LTD. (1-32, Chayamachi Kita-ku, Osaka-sh, Osaka 13, 〒5300013, JP)
ヤンマー株式会社 (〒13 大阪府大阪市北区茶屋町1番32号 Osaka, 〒5300013, JP)
HAGIWARA, Ryoichi (1-32, Chayamachi, Kita-ku, Osaka-sh, Osaka 13, 〒5300013, JP)
萩原 良一 (〒13 大阪府大阪市北区茶屋町1番32号 ヤンマー株式会社内 Osaka, 〒5300013, JP)
NAKAZONO, Toru (1-32, Chayamachi, Kita-ku, Osaka-sh, Osaka 13, 〒5300013, JP)
International Classes:
F02D45/00; F02D19/02; F02D41/04; F02D43/00; F02P5/15
Foreign References:
JP2005240585A
JP2007100581A
JP2005264730A
JP2008002271A
JPS63113130A
Attorney, Agent or Firm:
TANAKA, Mitsuo et al. (AOYAMA & PARTNERS, IMP Building 3-7, Shiromi 1-chome, Chuo-ku, Osaka-sh, Osaka 01, 〒5400001, JP)
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Claims:



 
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