Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Reexamination Certificate
2007-04-23
2008-10-28
Huynh, Hai H (Department: 3747)
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
C123S696000, C701S109000, C073S114720
Reexamination Certificate
active
07441554
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.
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Hori Toshio
Iihoshi Youichi
Kurashima Yoshikuni
Nakagawa Shinji
Crowell & Moring LLP
Hitachi , Ltd.
Huynh Hai H
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