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)
NUMATA AKIHITO (JP)
FUKUCHI EISAKU (JP)
Application Number:
PCT/JP2011/062752
Publication Date:
December 08, 2011
Filing Date:
June 03, 2011
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
NAKAGAWA SHINJI (JP)
NUMATA AKIHITO (JP)
FUKUCHI EISAKU (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:
See also references of EP 2578863A4
Attorney, Agent or Firm:
HIRAKI YUSUKE (JP)
Yusuke Hiraki (JP)
Yusuke Hiraki (JP)
Download PDF:
Claims:
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