Title:
AIR FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP3168355
Kind Code:
B2
Abstract:
PURPOSE: To improve accuracy of feed back control of an air fuel ratio in an internal combustion engine.
CONSTITUTION: An air fuel ratio is replaced into an air fuel ratio equivalent value LMD from the output value of an air fuel ratio sensor (Step 1 to 3), the deviation ERLMD between a target air fuel ratio and the air fuel ratio equivalent value LMD is found out (Step 4), an intake air flow equivalent value QLMD is calculated (step 5), Proportion P is set as P=ERLMD.QLMD.KP (KP is a constant), and Integration I is set as I=ERLMD.Q2LMD.KI(KI is a constant, Q2LMD=QLMD2). It is thus possible to set proportion P and the integration I in which consideration of delay of output starting-up and a time constant of the air fuel ratio sensor is taken.
Inventors:
Junichi Furuya
Application Number:
JP21800092A
Publication Date:
May 21, 2001
Filing Date:
August 17, 1992
Export Citation:
Assignee:
Unisia Jecs Co., Ltd.
International Classes:
F02D41/14; F02D45/00; (IPC1-7): F02D41/14; F02D45/00
Domestic Patent References:
| JP2157443A | ||||
| JP6394049A | ||||
| JP4124438A | ||||
| JP63154831A | ||||
| JP3294637A |
Attorney, Agent or Firm:
Fujio Sasashima