Title:
CONTROL DEVICE OF ENGINE
Document Type and Number:
Japanese Patent JP2016148275
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To limit the lowering of the accuracy of abnormality determination of an exhaust emission purification catalyst 52 caused by the execution of a purge while executing the purge at a speed reduction fuel cut of an engine 1 when performing the abnormality determination of the exhaust emission purification catalyst 52 on the basis of a total amount of an excess amount of fuel with respect to a stoichiometric operation up to a change of an output value of an Osensor 56 which is not smaller than a prescribed value after transition to a normal operation from the speed reduction fuel cut of the engine 1.SOLUTION: An air-fuel ratio in a combustion chamber 6 of an engine 1 at a speed reduction fuel cut immediately before when a purge is executed at the immediately-before speed reduction fuel cut which is executed immediately before abnormality determination is estimated, and when the purge has been executed at the immediately-before speed reduction fuel cut, a threshold for determining an abnormality of an exhaust emission purification catalyst related to a total amount of an excess amount of fuel is changed on the basis of the estimated air-fuel ratio at the abnormality determination.SELECTED DRAWING: Figure 1
Inventors:
TANAKA KAZUAKI
SAKAMOTO YUZO
TSUBOI HIROSHI
SAKAMOTO YUZO
TSUBOI HIROSHI
Application Number:
JP2015025209A
Publication Date:
August 18, 2016
Filing Date:
February 12, 2015
Export Citation:
Assignee:
MAZDA MOTOR
International Classes:
F02D45/00; F01N3/20; F01N3/24; F02D41/04; F02D41/12; F02D43/00; F02M25/08
Domestic Patent References:
| JP2004204809A | 2004-07-22 | |||
| JP2000328930A | 2000-11-28 | |||
| JPH0941954A | 1997-02-10 | |||
| JPH1018835A | 1998-01-20 | |||
| JP2005256623A | 2005-09-22 |
Attorney, Agent or Firm:
Maeda patent office