Cylinder deactivation method to minimize drivetrain torsional disturbances
First Claim
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1. A system for an engine having at least a first and second cylinder, the cylinders each having at least an intake and an exhaust valve, the system comprising:
- a controller configured to;
operate the engine in a first mode where at least both the first cylinder and second cylinder open and close at least both their respective intake and exhaust valves to induct air, combust said air with injected fuel, and exhaust combusted gas products;
operate the engine in a second mode where at least one of the first cylinder and second cylinder opens and closes its intake and exhaust valves to induct air, combust said air with injected fuel, and exhaust combusted gas products, and the other of said first and second cylinders opens and closes at least one of its intake or exhaust valves while maintaining at least the other of its intake or exhaust valves closed during a cycle of the engine;
operate the engine in a third mode where one of said first and second cylinders operates with at least both intake and exhaust valves closed during a cycle of the engine; and
selecting at least one of said first, second and third modes based on an operating condition.
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Abstract
A system and method are described for reducing engine vibration during cylinder deactivation in selected operating conditions. The method utilizes open valve deactivation to better match the cylinder pressure of deactivated cylinders to combusting cylinders. This mode is utilized, along with cylinder closed valve cylinder deactivation, to improve overall fuel economy, while at the same time reducing vibration felt by the vehicle driver.
88 Citations
28 Claims
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1. A system for an engine having at least a first and second cylinder, the cylinders each having at least an intake and an exhaust valve, the system comprising:
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a controller configured to;
operate the engine in a first mode where at least both the first cylinder and second cylinder open and close at least both their respective intake and exhaust valves to induct air, combust said air with injected fuel, and exhaust combusted gas products;
operate the engine in a second mode where at least one of the first cylinder and second cylinder opens and closes its intake and exhaust valves to induct air, combust said air with injected fuel, and exhaust combusted gas products, and the other of said first and second cylinders opens and closes at least one of its intake or exhaust valves while maintaining at least the other of its intake or exhaust valves closed during a cycle of the engine;
operate the engine in a third mode where one of said first and second cylinders operates with at least both intake and exhaust valves closed during a cycle of the engine; and
selecting at least one of said first, second and third modes based on an operating condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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15. A system for an engine having at least a first and second cylinder, the cylinders each having at least an intake and an exhaust valve, the system comprising:
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a controller configured to;
operate the engine in a first mode where at least both the first cylinder and second cylinder open and close at least both their respective intake and exhaust valves to induct air, combust said air with injected fuel, and exhaust combusted gas products;
operate the engine in a second mode where at least one of the first cylinder and second cylinder opens and closes its intake and exhaust valves to induct air, combust said air with injected fuel, and exhaust combusted gas products, and the other of said first and second cylinders opens and closes at least its exhaust valve while maintaining at least its intake valve closed during a cycle of the engine;
operate the engine in a third mode where one of said first and second cylinders operates with at least both intake and exhaust valves closed during a cycle of the engine; and
selecting at least one of said first, second and third modes based on an operating condition.
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27. A system for an engine having at least a first and second cylinder, the cylinders each having at least an intake and an exhaust valve, the system comprising:
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a controller configured to;
operate the engine in a first mode where at least both the first cylinder and second cylinder open and close at least both their respective intake and exhaust valves to induct air, combust said air with injected fuel, and exhaust combusted gas products;
operate the engine in a second mode where at least one of the first cylinder and second cylinder opens and closes its intake and exhaust valves to induct air, combust said air with injected fuel, and exhaust combusted gas products, and the other of said first and second cylinders opens and closes at least one of its intake or exhaust valves while maintaining at least the other of its intake or exhaust valves closed during a cycle of the engine;
operate the engine in a third mode where at least both the first cylinder and second cylinder are operated without injected fuel; and
selecting at least one of said first, second and third modes based on an operating condition. - View Dependent Claims (28)
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Specification