Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
2007-09-04
2007-09-04
Wolfe, Jr., Willis R. (Department: 3747)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
C060S276000, C060S285000
Reexamination Certificate
active
11259068
ABSTRACT:
An simplified structure of an air-fuel ratio control system for an internal combustion engine includes an upstream and a downstream catalytic device installed in an exhaust pipe of the engine and a first, a second, and a third air-fuel ratio sensor installed in upstream or downstream side of the exhaust pipe. The system also includes a first feedback controller working to bring a value of the air-fuel ratio, as measured by the first air-fuel ratio sensor, into agreement with a target one and a second feedback controller working to sample values of the air-fuel ratios, as measured by the second and third air-fuel ratio sensors, to correct a predetermined controlled parameter in the feedback control of the first feedback controller.
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Iida Hisashi
Ikemoto Noriaki
DENSO Corporation
Nixon & Vanderhye P.C.
Wolfe, Jr. Willis R.
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