Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
ABNORMALITY DETERMINATION DEVICE OF AIR-FUEL RATIO SENSOR
Document Type and Number:
Japanese Patent JP2012251435
Kind Code:
A
Abstract:

To provide an abnormality determination device of an air-fuel ratio sensor which can accurately determine an abnormality of the air-fuel ratio sensor even if a change amount of the air-fuel ratio of exhaust gas is relatively small.

In the abnormality determination device, the abnormality of the air-fuel ratio sensor is determined on the basis of a relationship KJUDSVO2RL between an output change period parameter WDSVO2RL indicating a period in which an output change amount DSVO2 of the air-fuel ratio sensor which is changed by the switching of a mixed-air air-fuel ratio to a lean air-fuel ratio from a rich air-fuel ratio returns again to a prescribed change amount after reaching the prescribed change amount, and an output change amount extremal value HDSVO2RL being an extremal value of the output change amount DSVO2 of the air-fuel ratio sensor which is obtained within a period indicated by the output change period parameter WDSVO2RL (steps 14 to 16, 18, 20, 21 and 23).


Inventors:
AOKI TAKESHI
MIYAUCHI ATSUHIRO
TANI OSANORI
WATANABE SEIJI
SEKIGUCHI NOBU
ANDO HIROYUKI
Application Number:
JP2011122470A
Publication Date:
December 20, 2012
Filing Date:
May 31, 2011
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
HONDA MOTOR CO LTD
International Classes:
F02D41/22; F02D41/12; F02D41/14; F02D45/00
Domestic Patent References:
JP2010077806A2010-04-08
JP2006057588A2006-03-02
JP2004225684A2004-08-12
JP2005307961A2005-11-04
JP2003020989A2003-01-24
JPH0416757A1992-01-21
JP2006070778A2006-03-16
JP2010249003A2010-11-04
JP2010077806A2010-04-08
JP2006057588A2006-03-02
JP2004225684A2004-08-12
JP2005307961A2005-11-04
JP2003020989A2003-01-24
JPH0416757A1992-01-21
Attorney, Agent or Firm:
Tomoo Takahashi



 
Previous Patent: DETERMINATION DEVICE OF INTERNAL COMBUSTION ENGINE

Next Patent: COMPRESSOR