DEVICE FOR DETECTING INTER-CYLINDER AIR-FUEL RATIO IMBALANCE IN MULTI-CYLINDER INTERNAL COMBUSTION ENGINE

Title:

DEVICE FOR DETECTING INTER-CYLINDER AIR-FUEL RATIO IMBALANCE IN MULTI-CYLINDER INTERNAL COMBUSTION ENGINE

Document Type and Number:

WIPO Patent Application WO/2014/118850

Kind Code:

A1

Abstract:

Provided is a device for detecting an inter-cylinder air-fuel ratio imbalance in a multi-cylinder internal combustion engine. This device is equipped with: a supercharger installed in connection with a multi-cylinder internal combustion engine; a bypass passage that bypasses the turbine of the supercharger; a waste gate valve that opens/closes the bypass passage; an air-fuel ratio sensor installed in a portion of the exhaust passage of the multi-cylinder internal combustion engine downstream from the convergence point of the downstream side of the turbine and the downstream side of the bypass passage; and a determination unit programmed so as to determine an imbalance in the air-fuel ratio between the cylinders, by comparing the degree of variation in the output of the air-fuel ratio sensor, or a parameter value correlated therewith, with a prescribed threshold value. The determination unit is programmed so as not to perform a determination of an imbalance in the air-fuel ratio between the cylinders when the degree of opening of the waste gate valve is equal to or greater than a prescribed standard degree of opening.

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Inventors:

TSUNOOKA TAKASHI (JP)
FUKUI WATARU (JP)

Application Number:

PCT/JP2013/007240

Publication Date:

August 07, 2014

Filing Date:

December 09, 2013

Export Citation:

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Assignee:

TOYOTA MOTOR CO LTD (JP)
TSUNOOKA TAKASHI (JP)
FUKUI WATARU (JP)

International Classes:

F02D45/00; F02B23/00; F02B37/18; F02D23/00; F02D41/22; F02D43/00

Foreign References:

JP2012180793A	2012-09-20
JP2012137050A	2012-07-19
JP5067509B2	2012-11-07
JP2012107521A	2012-06-07

Attorney, Agent or Firm:

TANI & ABE, p. c. (JP)
Patent business corporation A valley and Abe patent firm (JP)

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