Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
2007-01-09
2007-01-09
Cronin, Stephen K. (Department: 3747)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
C060S276000, C073S118040
Reexamination Certificate
active
10481245
ABSTRACT:
An apparatus for controlling the air-fuel ratio of an internal combustion engine to stably determine a highly reliable identified value of a parameter of a model of an exhaust system including a catalytic converter and to increase the purifying capability of the catalytic converter. An exhaust-side control unit7asequentially variably sets a dead time of an exhaust system E depending on the flow rate of an exhaust gas supplied to a catalytic converter3, and sequentially identifies the value of a parameter of a model of the exhaust system E which has a dead time element of the set dead time. The exhaust-side control unit7asequentially calculates a target air-fuel ratio KCMD to converge the output of an O2sensor6to a target value using the identified value of the parameter, and an engine-side control unit7bmanipulates the air-fuel ratio of the internal combustion engine1depending on the target air-fuel ratio KCMD. According to the algorithm of the process of identifying the parameter of the model of the exhaust system E, the value of a weighted parameter is variable set depending on the flow rate of the exhaust gas.
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Cronin Stephen K.
Hoang Johnny H.
Squire Sanders & Dempsey L.L.P.
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