Method and system for selective cylinder deactivation
First Claim
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1. A method for an engine, comprising:
- deactivating one or more individual cylinder valve mechanisms according to a cylinder pattern; and
reactivating one or more individual cylinder valve mechanisms in response to a request for a cam phasing,the cylinder pattern including a first and a second deactivated cylinder and a third active cylinder, wherein reactivating one or more individual cylinder valve mechanisms includes reactivating the individual cylinder valve mechanism of the first cylinder while maintaining the individual cylinder valve mechanism of the second cylinder deactivated.
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Abstract
Methods and systems are provided for adjusting a cylinder deactivation pattern to improve camshaft phasing. In response to a request for actuating a camshaft phaser of a variable cam timing device, a cylinder deactivation pattern is adjusted by reactivating cylinders that were deactivated while deactivating other cylinders that were active, while maintaining a total number of deactivated/active cylinders. Cylinders are selected for reactivation or deactivation based on their individual camshaft torsion signatures so that sufficient cam torque is generated to actuate the phaser and provide the requested phasing.
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Citations
16 Claims
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1. A method for an engine, comprising:
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deactivating one or more individual cylinder valve mechanisms according to a cylinder pattern; and reactivating one or more individual cylinder valve mechanisms in response to a request for a cam phasing, the cylinder pattern including a first and a second deactivated cylinder and a third active cylinder, wherein reactivating one or more individual cylinder valve mechanisms includes reactivating the individual cylinder valve mechanism of the first cylinder while maintaining the individual cylinder valve mechanism of the second cylinder deactivated. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method, comprising:
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operating an engine in a first mode with a first cylinder deactivation pattern wherein, in response to a first request for a cam phasing, an individual cylinder valve mechanism of a deactivated cylinder is reactivated; operating the engine in a second mode with a second, different cylinder deactivation pattern wherein, in response to a second request for a cam phasing, an individual cylinder valve mechanism of a deactivated cylinder is maintained deactivated; wherein the first and second cylinder deactivation patterns each has a common total number of deactivated/active cylinders, and wherein a first set of cylinders of the first cylinder deactivation pattern is distinct from a second set of cylinders of the second cylinder deactivation pattern; wherein operating the engine in the first mode further includes, while reactivating the individual cylinder valve mechanism of the deactivated cylinder, deactivating an individual cylinder valve mechanism of an active cylinder; and selecting the active cylinder for deactivation during the first mode based on at least one of a timing and an amplitude of camshaft torsionals generated by the active cylinder. - View Dependent Claims (8, 9)
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10. A method for an engine, comprising:
deactivating an individual cylinder valve mechanism according to a cylinder pattern, and reactivating the individual cylinder valve mechanism via a cam-torque actuated phaser coupled to a camshaft in response to a request for a cam phasing and a required cam torque for the cam phasing. - View Dependent Claims (11, 12, 13, 14, 15, 16)
Specification