Engine valve actuation system
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Accused Products
Abstract
An engine valve actuation system is provided. The engine valve actuation system includes an intake valve that is moveable between a first position to prevent a flow of fluid and a second position to allow a flow of fluid. A cam assembly is configured to move the intake valve between the first position and the second position. A fluid actuator is configured to selectively prevent the intake valve from moving to the first position. A source of fluid is in fluid communication with the fluid actuator. A directional control valve is configured to control a flow of fluid between the source of fluid and the fluid actuator. A fluid passageway connects the directional control valve with the fluid actuator. An accumulator is in fluid communication with the fluid passageway. A restricted orifice is disposed between the accumulator and the fluid passageway to restrict a flow of fluid between the accumulator and the fluid passageway.
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Citations
20 Claims
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1-9. -9. (canceled)
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10. A method of controlling an engine having a piston moveable through an intake stroke followed by a compression stroke, comprising:
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rotating a cam to move an intake valve between a first position to prevent a flow of fluid and a second position to allow a flow of fluid during the intake stroke of the piston;
directing fluid through a directional control valve and a fluid passageway to a fluid actuator associated with the intake valve when the intake valve is moved from the first position;
actuating the directional control valve to selectively prevent fluid from flowing through the fluid passageway from the fluid actuator to thereby prevent the intake valve from moving to the first position during at least a portion of the compression stroke of the piston; and
directing fluid from the fluid passageway through a restricted orifice to an accumulator to inhibit oscillations in the fluid actuator. - View Dependent Claims (11, 12, 13)
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14. A fluid actuator for selectively preventing an engine valve from closing, comprising:
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a housing having an inlet, a snubbing valve chamber, an actuator chamber, a first fluid passageway connecting the inlet with the snubbing valve chamber, a second fluid passageway connecting the inlet with the snubbing valve chamber, and a third fluid passageway connecting the snubbing valve chamber with the actuator chamber;
a snubbing valve disposed in the snubbing valve chamber and adapted to control a flow rate of fluid through the fluid passageway;
a check valve disposed in the first fluid passageway and adapted to allow a flow of fluid from the inlet through the first fluid passageway to the snubbing valve chamber and to prevent a flow of fluid from the snubbing valve chamber through the first fluid passageway to the inlet;
an accumulator in fluid communication with the first and second fluid passageways;
a restricted orifice disposed between the first and second fluid passageways and the accumulator; and
a piston having an actuator rod and being disposed in the actuator chamber, the piston adapted to move the actuator rod into an engine valve actuation position in response to an introduction of fluid to the actuator chamber. - View Dependent Claims (15, 16, 17, 18, 19)
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20-28. -28. (canceled)
Specification