Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Reexamination Certificate
2007-06-05
2007-06-05
Huynh, Hai (Department: 3747)
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
C123S696000, C123S399000
Reexamination Certificate
active
11019552
ABSTRACT:
The invention provides an engine controller, which can determine a deterioration mode (gain deterioration or response deterioration) of an air/fuel (A/F) ratio sensor, can detect a degree of the deterioration with high accuracy, and can optimize A/F ratio feedback control in accordance with the diagnosis result. The controller includes a unit for computing frequency response characteristics in a range from an A/F ratio adjusting unit to the A/F ratio sensor, and it diagnoses the A/F ratio sensor based on a gain characteristic and a response characteristic given by the computed frequency response characteristics. In accordance with the diagnosis result, parameters (P- and I-component gains) used in A/F ratio feedback control (PI control) are optimized.
REFERENCES:
patent: 6481273 (2002-11-01), Maloney
patent: 6550466 (2003-04-01), Behr et al.
patent: 6961653 (2005-11-01), Maki
patent: 7021300 (2006-04-01), Maki et al.
patent: 7-247886 (1995-09-01), None
patent: 2002-61537 (2002-02-01), None
patent: 2003-270193 (2003-09-01), None
patent: 2005-194891 (2005-07-01), None
Hori Toshio
Iihoshi Youichi
Kurashima Yoshikuni
Nakagawa Shinji
Crowell & Moring LLP
Hitachi , Ltd.
Huynh Hai
LandOfFree
Engine controller does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Engine controller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Engine controller will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3867833