Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1997-10-29
1999-03-16
Okonsky, David A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123 1A, F02D 4116
Patent
active
058817034
ABSTRACT:
The present invention provides a flexible fuel compensation system for controlling operating parameters of an internal combustion engine based on a learned value of the percent alcohol content of the fuel using an oxygen feedback system. The methodology determines a fuel composition multiplier based on the percent alcohol content and implements gasoline operating parameters for the internal combustion engine if the fuel composition multiplier is less than a first threshold value, mixed gasoline/alcohol operating parameters if the fuel composition multiplier is greater than the first threshold value, and high concentration alcohol operating parameters if the fuel composition multiplier is greater than a second threshold value for a number of comparison checks. After a predetermined period, the fuel composition multiplier is updated and re-compared to the first and second thresholds and the appropriate one of the aforementioned operating parameters is implemented. A third update of the fuel composition multiplier is made if the determined fuel composition multiplier is less than the actual percent alcohol content of the fuel by more than a given amount.
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Cheng Yi
Huff Shean
Joyce Mary
Kennie Jerry
Krozek Dennis A.
Calcaterra Mark P.
Chrysler Corporation
Okonsky David A.
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