Title:
AIR-FUEL RATIO CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP2016125478
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To suitably purify methane in exhaust with a three-way catalyst in an air-fuel ratio control device of an internal combustion engine operated by using methane-based fuel.SOLUTION: An air-fuel ratio control device of an internal combustion engine comprises: acquisition means which acquires a temperature of a three-way catalyst installed in an exhaust passage; setting means which sets a target air-fuel ratio of an air-fuel mixture to be used for combustion of the internal combustion engine in accordance with the temperature acquired by the acquisition means; and control means which controls a fuel injection valve in accordance with the target air-fuel ratio set by the setting means. The three-way catalyst has a characteristic of making the air-fuel ratio which maximizes a methane purification rate lower when the temperature of the three-way catalyst is low than when the same is high. On the basis of the characteristic, the air-fuel ratio control device sets the air-fuel ratio which maximizes the methane purification rate at the temperature acquired by the acquisition means as the target air-fuel ratio.SELECTED DRAWING: Figure 4
Inventors:
SUZUKI NAOKI
TANIGUCHI SATOSHI
NISHIUMI RYOJI
SUGIURA MASAKI
TANIGUCHI SATOSHI
NISHIUMI RYOJI
SUGIURA MASAKI
Application Number:
JP2015002552A
Publication Date:
July 11, 2016
Filing Date:
January 08, 2015
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
F02D41/14; F01N3/24; F02D19/02; F02D41/02; F02D41/06; F02D43/00; F02D45/00; F02M21/02; F02M37/00
Attorney, Agent or Firm:
Yoshiyuki Kawaguchi
Kazunobu Sera
Akira Hirakawa
Takehiko Sekine
Katsuhiko Imahori
Fuminori Miyashita
Kazunobu Sera
Akira Hirakawa
Takehiko Sekine
Katsuhiko Imahori
Fuminori Miyashita