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Engine valve actuation system

  • US 7,004,122 B2
  • Filed: 10/30/2002
  • Issued: 02/28/2006
  • Est. Priority Date: 05/14/2002
  • Status: Expired due to Fees
First Claim
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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 configured to move the intake valve between the first position and the second position, wherein the cam assembly is mechanically connected to the intake valve;

    a fluid actuator configured to selectively prevent the intake valve from moving to the first position, and further configured to selectively hold the intake valve at a position between the first position and the second position;

    a source of fluid in fluid communication with the fluid actuator;

    a directional control valve configured to control a flow of fluid between the source of fluid and the fluid actuator;

    a fluid passageway connecting the directional control valve with the fluid actuator;

    an accumulator in fluid communication with the fluid passageway; and

    a restricted orifice 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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