Air/fuel ratio control system for automotive vehicle using feedback control
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United States of America Patent
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-
Sep 4, 2007
Grant Date -
Jun 29, 2006
app pub date -
Oct 27, 2005
filing date -
Dec 27, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
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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