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 said intake valve between said first position and said second position;
a fluid actuator configured to selectively prevent said intake valve from moving to said first position;
a source of fluid in fluid communication with said fluid actuator;
a directional control valve configured to control a flow of fluid between said source of fluid and said fluid actuator; and
a fluid line check valve disposed between said source of fluid and said directional control valve and only allowing said flow of fluid to travel from said source of fluid to said directional control valve.
1 Assignment
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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 check valve is disposed between the directional control valve and the source of fluid, only allowing fluid flow from the fluid source to the directional control valve. A bleed orifice may be disposed between the directional control valve and the source of fluid, in parallel with the check valve.
16 Citations
15 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 said intake valve between said first position and said second position;
a fluid actuator configured to selectively prevent said intake valve from moving to said first position;
a source of fluid in fluid communication with said fluid actuator;
a directional control valve configured to control a flow of fluid between said source of fluid and said fluid actuator; and
a fluid line check valve disposed between said source of fluid and said directional control valve and only allowing said flow of fluid to travel from said source of fluid to said directional control valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling fluid pressure in a fluid rail comprising:
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delivering fluid to a fluid rail from a fluid source;
Moving a cam to actuate an engine valve;
delivering said fluid from said fluid rail to an actuator chamber of a fluid actuator;
moving an actuator rod of said fluid actuator from a first position to a seems position to a second position in response to said delivering said fluid from said fluid rail to said actuator chamber delivering fluid from said actuator chamber back to said fluid rail;
limiting a fluid flow from said fluid rail to said fluid source in response to said delivering fluid from said actuator chamber back to said fluid rail step. - View Dependent Claims (13, 14, 15)
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Specification