Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1992-11-06
1993-08-24
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
F02M 5100
Patent
active
052379833
ABSTRACT:
An air/fuel control system for use with an internal combustion engine which is adapted to burn fuels having different combustion characteristics. The control system compensates for errors in the fuel-type signal produced by a sensor and provides a failure mode of operation when the sensor fails. A closed-loop air/fuel mixture controller responds to sensed exhaust oxygen levels to maintain combustion near stoichiometry. When the errors from the fuel type sensor predominate, at high engine speed and load, a selected one of two fuel-type variables, is adaptively modified. The first variable is modified in response to the control system's inability to achieve stoichiometry during high speed/high load operation, a condition which causes the first variable to correct the fuel type signal from the sensor. The second variable assumes control when the first variable is unable to achieve stoichiometry, indicating sensor failure, and is updated in accordance with a more vigorous strategy. The second variable is modified regardless of engine speed and load, and closed-loop adaptive processing is forced even when the exhaust level signal no longer switches. The limits on the exhaust level signal are relaxed to allow it to grow to larger magnitudes, and processing which is not needed during failure mode is discontinued to allow adaptive processing to proceed more rapidly.
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Curran Judith M.
Willey Raymond L.
Ford Motor Company
Lippa Allan J.
May Roger L.
Nelli Raymond A.
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