Title:
AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP3889410
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To maintain excellent control performance over a long period of time by minimizing a lowering of control performance by adaptive control even in the case the response characteristics of an air-fuel ratio sensor is degraded.
SOLUTION: The degradation of response characteristics of the air-fuel ratio sensor is detected (S145) by a parameter which is an adaptive parameter computed based on the dynamic model of an engine, to determine the response speed of adaptive feedback control. When detecting response degradation (FSTRRSP=0), the adaptive parameter is computed using a gain matrix Γ for the response degradation (S141, S142, S144). The gain matrix Γ for the response degradation is set to lower the adjusting speed of the adaptive parameter compared to a normal gain matrix Γ.
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Inventors:
Hiroshi Kitagawa
Hidetaka Maki
Hidetaka Maki
Application Number:
JP2004160030A
Publication Date:
March 07, 2007
Filing Date:
May 28, 2004
Export Citation:
Assignee:
Honda motor industry stock company
International Classes:
F02D41/14; F02D45/00; F02D41/22; (IPC1-7): F02D41/14; F02D41/22; F02D45/00
Domestic Patent References:
| JP2173334A | ||||
| JP6042385A | ||||
| JP5005447A |
Attorney, Agent or Firm:
Tomoo Takahashi
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