Title:
AIR-FUEL RATIO CONTROL DEVICE, AIR-FUEL RATIO CONTROL METHOD, AND PROGRAM
Document Type and Number:
Japanese Patent JP2015059479
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To improve fuel efficiency by increasing an operation time at a target air fuel ratio by using a last learning value when there is a small possibility an actual air fuel ratio may deviate from the target air fuel ratio.SOLUTION: At a start of an internal combustion engine, feedback control means changes a target air fuel ratio to an ideal air furl ratio based upon a last learning value, and open-loop control means controls the air fuel ratio to the target air fuel ratio by using the last learning value when a feedback correction coefficient determined based upon the output of an Osensor is within a predetermined range, but learning value update means updates the last learning value to a learning value calculated by learning value calculation means when the feedback correction coefficient determined based upon the output of the Osensor is not within the predetermined range.
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Inventors:
MURAMATSU GO
NANBA MASAHIRO
NANBA MASAHIRO
Application Number:
JP2013193058A
Publication Date:
March 30, 2015
Filing Date:
September 18, 2013
Export Citation:
Assignee:
SUZUKI MOTOR CORP
International Classes:
F02D45/00; F02D41/14
Attorney, Agent or Firm:
Takayoshi Kokubu