Fuel cutoff transition control systems and methods
First Claim
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1. An engine control system comprising:
- a fuel cutoff (FCO) module that, when a FCO event is disabled, determines a feed-forward (FF) number of cylinders to offset a delay period associated with supplying fuel to the cylinders of an engine and selectively maintains a FCO torque request at a predetermined torque;
a fuel control module that commands fuel be supplied to the FF number of cylinders of the engine when the FCO event is disabled; and
a spark control module that maintains a spark timing of the FF number of cylinders at a fully retarded spark timing based on the FCO torque request.
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Abstract
An engine control system includes a fuel cutoff (FCO) module, a fuel control module, and a spark control module. The FCO module, when a FCO event is disabled, determines a feed-forward (FF) number of cylinders to offset a delay period associated with supplying fuel to the cylinders of an engine and selectively maintains a FCO torque request at a predetermined torque. The fuel control module commands fuel be supplied to the FF number of cylinders of the engine when the FCO event is disabled. The spark control module maintains a spark timing of the FF number of cylinders at a fully retarded spark timing based on the FCO torque request.
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Citations
20 Claims
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1. An engine control system comprising:
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a fuel cutoff (FCO) module that, when a FCO event is disabled, determines a feed-forward (FF) number of cylinders to offset a delay period associated with supplying fuel to the cylinders of an engine and selectively maintains a FCO torque request at a predetermined torque; a fuel control module that commands fuel be supplied to the FF number of cylinders of the engine when the FCO event is disabled; and a spark control module that maintains a spark timing of the FF number of cylinders at a fully retarded spark timing based on the FCO torque request. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An engine control method comprising:
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determining a feed-forward (FF) number of cylinders to offset a delay period associated with supplying fuel to the cylinders of an engine when a FCO event is disabled; selectively maintaining a FCO torque request at a predetermined torque when the FCO event is disabled; commanding fuel be supplied to the FF number of cylinders of the engine when the FCO event is disabled; and maintaining a spark timing of the FF number of cylinders at a fully retarded spark timing based on the FCO torque request when the FCO event is disabled. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification