Fuel consumption based cylinder activation and deactivation control systems and methods
First Claim
1. A cylinder control system for a vehicle, comprising:
- a torque request module that generates a torque request for an engine based on at least one driver input;
a firing fraction module that, based on the torque request, determines a target number of activated cylinders of the engine;
a sequence module that determines possible sequences for activating and deactivating cylinders of the engine to achieve the target number of activated cylinders;
a fueling module that determines predicted fuel consumption values for the possible sequences, respectively;
an identification module that identifies first ones of the possible sequences having predicted fuel consumption values that are less than a predetermined amount from a lowest one of the predicted fuel consumption values;
a selection module that selects one of the first ones of the possible sequences and that sets a selected sequence for activating and deactivating cylinders of the engine to the selected one of the first ones of the possible sequences; and
a command module that, based on the selected sequence, commands one of activation and deactivation of a next cylinder in a predetermined firing order of the cylinders and that one of activates and deactivates the next cylinder based on the command.
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Abstract
A cylinder control method includes: generating a torque request for an engine based on at least one driver input; based on the torque request, determining a target number of activated cylinders of the engine; determining possible sequences for activating and deactivating cylinders of the engine to achieve the target number of activated cylinders; determining predicted fuel consumption values for the possible sequences, respectively; identifying first ones of the possible sequences having predicted fuel consumption values that are less than a predetermined amount from a lowest one of the predicted fuel consumption values; selecting one of the first ones of the possible sequences; setting a selected sequence for activating and deactivating cylinders of the engine to the selected one of the first ones of the possible sequences; based on the selected sequence, one of activating and deactivating a next cylinder in a predetermined firing order of the cylinders.
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Citations
20 Claims
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1. A cylinder control system for a vehicle, comprising:
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a torque request module that generates a torque request for an engine based on at least one driver input; a firing fraction module that, based on the torque request, determines a target number of activated cylinders of the engine; a sequence module that determines possible sequences for activating and deactivating cylinders of the engine to achieve the target number of activated cylinders; a fueling module that determines predicted fuel consumption values for the possible sequences, respectively; an identification module that identifies first ones of the possible sequences having predicted fuel consumption values that are less than a predetermined amount from a lowest one of the predicted fuel consumption values; a selection module that selects one of the first ones of the possible sequences and that sets a selected sequence for activating and deactivating cylinders of the engine to the selected one of the first ones of the possible sequences; and a command module that, based on the selected sequence, commands one of activation and deactivation of a next cylinder in a predetermined firing order of the cylinders and that one of activates and deactivates the next cylinder based on the command. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A cylinder control method for a vehicle, comprising:
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generating a torque request for an engine based on at least one driver input; based on the torque request, determining a target number of activated cylinders of the engine; determining possible sequences for activating and deactivating cylinders of the engine to achieve the target number of activated cylinders; determining predicted fuel consumption values for the possible sequences, respectively; identifying first ones of the possible sequences having predicted fuel consumption values that are less than a predetermined amount from a lowest one of the predicted fuel consumption values; selecting one of the first ones of the possible sequences; setting a selected sequence for activating and deactivating cylinders of the engine to the selected one of the first ones of the possible sequences; based on the selected sequence, commanding one of activation and deactivation of a next cylinder in a predetermined firing order of the cylinders; and one of activating and deactivating the next cylinder based on the command. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification