Engine valve actuation system
First Claim
1. An engine valve actuation system, comprising:
- an intake valve moveable between a first position to prevent a flow of fluid and a second position to allow a flow of fluid;
a cam assembly connected to move the intake valve between the first position and the second position;
a fluid actuator configured to selectively prevent the intake valve from moving to the first position;
a first source of fluid in fluid communication with the fluid actuator;
a second source of fluid configured to provide fluid having a pressure greater than the pressure of the fluid supplied by said first source of fluid;
a directional control valve configured to control a flow of fluid between the source of fluid and the fluid actuator; and
a directional control valve disposed between either the first or the second source of fluid and the fluid actuator and moveable between a first position to prevent a flow of fluid between either the first or the second source of fluid and the directional control valve and a second position to allow the flow of fluid from either the first or the second source of fluid to the directional control valve.
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Accused Products
Abstract
An engine valve actuation system is provided. An intake valve 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 connected 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 control valve is disposed between the source of fluid and the directional control valve. The control valve is moveable between a first position to prevent the flow of fluid between the source of fluid and the directional control valve and a second position to allow the flow of fluid from the source of fluid to the directional control valve.
127 Citations
26 Claims
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1. An engine valve actuation system, comprising:
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an intake valve moveable between a first position to prevent a flow of fluid and a second position to allow a flow of fluid; a cam assembly connected to move the intake valve between the first position and the second position; a fluid actuator configured to selectively prevent the intake valve from moving to the first position; a first source of fluid in fluid communication with the fluid actuator; a second source of fluid configured to provide fluid having a pressure greater than the pressure of the fluid supplied by said first source of fluid; a directional control valve configured to control a flow of fluid between the source of fluid and the fluid actuator; and a directional control valve disposed between either the first or the second source of fluid and the fluid actuator and moveable between a first position to prevent a flow of fluid between either the first or the second source of fluid and the directional control valve and a second position to allow the flow of fluid from either the first or the second source of fluid to the directional control valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of controlling an engine having a piston moveable through an intake stroke followed by an compression stroke, comprising:
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rotating a cam to move an intake valve between a first position to prevent a flow piston; directing fluid through a control valve to a fluid actuator associated with the intake valve when the intake valve is removed from the first position; actuating a directional control valve to selectively prevent fluid from flowing 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; sensing at least one operating parameter of the engine; and moving the control valve to a closed position to prevent fluid from flowing to the directional control valve and the fluid actuator based on the sensed operating parameter of the engine. - View Dependent Claims (15, 16, 17)
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18. An engine, comprising:
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an engine block defining at least one cylinder and a cylinder head having at least one intake passageway leading to the at least one cylinder; at least one intake valve moveable between a first position to prevent a flow of fluid through the at least one intake passageway and a second position to allow a flow of fluid through the at least one intake passageway; a cam assembly connected to the intake valve to move the intake valve between the first position and the second position; a fluid actuator configured to selectively prevent the intake valve from moving to the first position; a first source of fluid in fluid communication with the fluid actuator;
a second source of fluid configured to provide fluid having a pressure greater than the pressure of the fluid supplied by said first source of fluid;a directional control valve configured to control a flow of fluid between the source of fluid and the fluid actuator; a control valve disposed between either the first or second source of fluid and the directional control valve and moveable between a first position to prevent a flow of fluid between either the first or second source of fluid and the directional control valve and a second position to allow the flow of fluid from either the first or second source of fluid to the directional control valve; and a controller configured to move the control valve between the first and second positions based upon at least one operating parameter of the engine. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification