CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

Title:

CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

Document Type and Number:

Japanese Patent JP2015140760

Kind Code:

A

Abstract:

PROBLEM TO BE SOLVED: To further reduce a discharge amount of harmful substances which are produced in an internal combustion engine.SOLUTION: An output signal of an air-fuel ratio sensor 43 at an upstream side of a catalyst 41 is compared with an upstream-side target value corresponding to a target air-fuel ratio at the upstream side of the catalyst, it is determined whether or not an air-fuel ratio at an upstream side of a current catalyst is leaner or richer than the target air-fuel ratio according to a magnitude relationship of the compared values, a correction amount is changed so as to gradually increase a fuel injection amount during the air-fuel ratio is determined to be lean, and on the other hand, during the air-fuel ratio is determined to be rich, the correction amount is changed so as to gradually reduce the fuel injection amount. Also, the upstream-side target value which is to be compared with the output signal of the air-fuel ratio sensor at the upstream side of the catalyst is changed on the basis of an output signal of an air-fuel ratio sensor 44 at a downstream side of the catalyst.

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Inventors:

SONODA TAKESHI
SHIMIZU TAKASHI
KINOSHITA SHINICHI
YAGI TOMOHIRO
HIGUCHI SHOGO

Application Number:

JP2014015264A

Publication Date:

August 03, 2015

Filing Date:

January 30, 2014

Export Citation:

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Assignee:

DAIHATSU MOTOR CO LTD

International Classes:

F02D41/14

Attorney, Agent or Firm:

Kazuhiro Akazawa
Takeshi Miyazawa

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