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System for controlling a variable valve actuation system

  • US 6,655,349 B1
  • Filed: 12/30/2002
  • Issued: 12/02/2003
  • Est. Priority Date: 12/30/2002
  • Status: Active Grant
First Claim
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1. A method of controlling a valve actuation system for an engine, comprising:

  • operating an intake cam assembly to move an intake valve between a first position where the intake valve blocks a flow of fluid relative to a cylinder and a second position where the intake valve allows a flow of fluid relative to the cylinder;

    operating an exhaust cam assembly to move an exhaust valve between a first position where the exhaust valve blocks a flow of fluid and a second position where the exhaust valve allows a flow of fluid;

    operating an engine brake to selectively move the exhaust valve from the first position towards the second position when a piston is at or near a top-dead-center position of a compression stroke;

    sensing at least one operating parameter of the engine;

    determining a desired intake valve actuation period based on the at least one operating parameter;

    operating a valve actuator to selectively prevent the intake valve from returning to the first position in response to operation of the intake cam assembly; and

    releasing the valve actuator to allow the intake valve to return to the first position at the end of the determined valve actuation period.

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