System for reactivating deactivated cylinders
First Claim
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1. An engine system, comprising:
- an engine including a first cylinder with a first intake valve and a first exhaust valve;
a first deactivating valve operator in mechanical communication with the first intake valve;
a first non-deactivating valve operator in mechanical communication with the first exhaust valve; and
a controller including instructions to activate the first intake valve in response to an estimate of an oil amount in a cylinder.
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Abstract
Systems and methods for operating an engine with deactivating and non-deactivating valves are presented. In one example, an estimate of an amount of oil that may intrude into a deactivated cylinder is made. The deactivated cylinder may be reactivated in response to the amount of oil estimated to be in the deactivated cylinder.
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Citations
20 Claims
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1. An engine system, comprising:
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an engine including a first cylinder with a first intake valve and a first exhaust valve; a first deactivating valve operator in mechanical communication with the first intake valve; a first non-deactivating valve operator in mechanical communication with the first exhaust valve; and a controller including instructions to activate the first intake valve in response to an estimate of an oil amount in a cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An engine system, comprising:
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an engine including a first cylinder with a first intake valve and a first exhaust valve; a first deactivating valve operator in mechanical communication with the first intake valve; a first non-deactivating valve operator in mechanical communication with the first exhaust valve; a second cylinder including a second intake valve and a second exhaust valve; a second deactivating valve operator in mechanical communication with the second intake valve; a second non-deactivating valve operator in mechanical communication with the second exhaust valve; and a controller including instructions to activate the first intake valve and deactivate the second intake valve while maintaining an actual total number of cylinders combusting air and fuel in an engine cycle in response to an estimate of an oil amount in a cylinder, where the second intake valve is closed for an entire cycle of the second cylinder when the second intake valve is deactivated. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method for operating an engine, comprising:
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deactivating a cylinder via closing an intake valve of the cylinder for an entire cycle of the cylinder while an exhaust valve of the cylinder opens and closes during the cycle of the cylinder; and adjusting a closing time of the exhaust valve in response to deactivating the cylinder. - View Dependent Claims (17, 18, 19, 20)
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Specification