ENGINE CONTROLLER - HITACHI AUTOMOTIVE SYSTEMS LTD

Title:

ENGINE CONTROLLER

Document Type and Number:

WIPO Patent Application WO/2011/152509

Kind Code:

A1

Abstract:

Degradation in exhaust is indicated when the air-fuel ratio between air cylinders fluctuates, but the rate of exhaust degradation and the magnitude of the degree of fluctuation in the air-fuel ratio between air cylinders detected by a catalytic upstream sensor are not always in agreement. An engine controller is provided which detects exhaust degradation caused by fluctuation in the air-fuel ratio between air cylinders. Means for calculating a specified frequency component (A) of a catalytic upstream sensor signal and means for calculating a specified frequency component (B) of the catalytic downstream sensor signal detect exhaust degradation caused by fluctuation in the air-fuel ratio between air cylinders in an engine, in accordance with the frequency component (A) and the frequency component (B).

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Inventors:

NAKAGAWA SHINJI (JP)
NUMATA AKIHITO (JP)
FUKUCHI EISAKU (JP)

Application Number:

PCT/JP2011/062752

Publication Date:

December 08, 2011

Filing Date:

June 03, 2011

Export Citation:

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Assignee:

HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
NAKAGAWA SHINJI (JP)
NUMATA AKIHITO (JP)
FUKUCHI EISAKU (JP)

International Classes:

F02D45/00; F02D9/02; F02D11/10; F02D41/14

Foreign References:

JPH1073043A	1998-03-17
JP2005133714A	2005-05-26
JP2009203881A	2009-09-10
JP2010096015A	2010-04-30
JPH08189343A	1996-07-23
JP2009030613A	2009-02-12
JP2009074388A	2009-04-09
JP2008051003A	2008-03-06
JP2000220489A	2000-08-08
JP2009030455A	2009-02-12

Other References: