Title:
AIR-FUEL RATIO CONTROL DEVICE
Document Type and Number:
Japanese Patent JP2019074028
Kind Code:
A
Abstract:
To restart feedback control at proper timing when an oxygen concentration sensor is failed.SOLUTION: An air-fuel ratio control device 100 controls an air-fuel ratio of an air-fuel mixture which is supplied to a combustion chamber 12A of an engine 10. A feedback correction part 106 feedback-corrects a fuel injection amount of the engine 10 on the basis of a detection value of an upstream-side oxygen concentration sensor 28 arranged on an exhaust flow passage of the engine 10 at the establishment of a prescribed feedback correction execution condition. A sensor failure detection part 110 detects a failure of the upstream-side oxygen concentration sensor 28. When the failure of the upstream-side oxygen concentration sensor 28 is detected, the feedback correction part 106 is transited to an establishment state of the feedback correction execution condition from a non-establishment state of the feedback correction execution condition, and sets a prescribed restart delay time ΔDT when starting the feedback correction.SELECTED DRAWING: Figure 2
Inventors:
KITADA JUNYA
Application Number:
JP2017200904A
Publication Date:
May 16, 2019
Filing Date:
October 17, 2017
Export Citation:
Assignee:
MITSUBISHI MOTORS CORP
International Classes:
F02D41/14; F02D45/00
Attorney, Agent or Firm:
Shigeru Noda