Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1997-10-29
1999-02-09
Solis, Erick R.
Internal-combustion engines
Charge forming device
Fuel injection system
123674, 123 1A, F02D 4126
Patent
active
058681175
ABSTRACT:
The present invention provides a method for determining ethanol thresholds for a flexible fuel control system for a motor vehicle capable of operating on more than one type of fuel. Preferably, the ethanol threshold is determined from an off-idle purge-free cell from a matrix of fuel adaptive memory cells normally used to compensate for car-to-car variations in required fueling. The ethanol threshold is periodically reduced to compensate for levels of alcohol creep indicated by the amount of purge-free adaptive memory elevation. If the learned value of percent alcohol content of the fuel is less than the ethanol threshold, gasoline operating parameters are implemented for the internal combustion engine. The off-idle purge-free cell also provides a basis for interpolating an on-board diagnostic (OBDII) ethanol threshold. As such, the OBDII monitors are only enabled if the learned value of percent alcohol content of the fuel is less than the OBDII ethanol threshold.
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Huff Shean
Joyce Mary
Krausman Howard W.
Moote Richard K.
Seitz Gary L.
Calcaterra Mark P.
Chrysler Corporation
Solis Erick R.
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