System and method for providing spark to an engine
First Claim
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1. A method for providing spark to an engine, comprising:
- operating a first group of cylinders and deactivating a second group of cylinders, the second group of cylinders deactivated via stopping spark and fuel flow to the second group of cylinders, increasing an amount of ignition energy provided to a cylinder of the second group of cylinders in response to a request to deactivate the cylinder, and deactivating the cylinder after providing the amount of ignition energy for a predetermined duration, the predetermined duration based on engine operating conditions before the request to deactivate the cylinder; and
providing spark without providing fuel to the cylinder of the second group of cylinders a predetermined duration after the second group of cylinders is deactivated.
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Abstract
An approach for supplying spark to a spark ignited engine having activated and deactivated engine cylinders is disclosed. In one example, the approach increases ignition energy supplied to spark plugs of deactivated cylinders to reduce the possibility of spark plug fouling for the deactivated cylinders while continuing to supply spark to activated cylinders.
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Citations
19 Claims
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1. A method for providing spark to an engine, comprising:
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operating a first group of cylinders and deactivating a second group of cylinders, the second group of cylinders deactivated via stopping spark and fuel flow to the second group of cylinders, increasing an amount of ignition energy provided to a cylinder of the second group of cylinders in response to a request to deactivate the cylinder, and deactivating the cylinder after providing the amount of ignition energy for a predetermined duration, the predetermined duration based on engine operating conditions before the request to deactivate the cylinder; and providing spark without providing fuel to the cylinder of the second group of cylinders a predetermined duration after the second group of cylinders is deactivated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for providing spark to an engine, comprising:
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operating a first group of cylinders via combusting air-fuel mixtures in the first group of cylinders; operating a second group of cylinders via combusting air-fuel mixtures in the second group of cylinders; increasing an amount of ignition energy provided to a cylinder of the second group of cylinders in response to a request to deactivate the cylinder; and deactivating the cylinder after providing the amount of ignition energy for a predetermined duration, the predetermined duration based on engine operating conditions before the request to deactivate the cylinder. - View Dependent Claims (10, 11, 12, 13)
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14. A system for providing spark to an engine, comprising:
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an engine including a first group of cylinders and a second group of cylinders; an ignition system including a first group of spark plugs positioned in the first group of cylinders and a second group of spark plugs positioned in the second group of cylinders; and a controller including executable instructions stored in non-transitory memory for increasing an amount of ignition energy provided to a cylinder of the second group of cylinders based on engine operating conditions before a request to deactivate the cylinder and deactivating the cylinder after providing the amount of ignition energy, and further instructions for supplying spark and fuel to the first and second groups of cylinders, deactivating the second group of cylinders via stopping spark and fuel flow in the second group of cylinders, operating the engine at a speed and load while the second group of cylinders is deactivated, and increasing the amount of ignition energy supplied to the second group of cylinders after deactivating the second group of cylinders without flowing fuel to the second group of cylinders, the amount of ignition energy increased to an amount of ignition energy that is greater than if the engine is operating at the speed and load with the first and second group of cylinders activated. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification