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Control system and method for variable valve actuation system

  • US 7,100,552 B2
  • Filed: 05/14/2002
  • Issued: 09/05/2006
  • Est. Priority Date: 05/14/2002
  • Status: Expired due to Term
First Claim
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1. A method of controlling a variable valve actuation system for an engine, comprising:

  • operating a cam assembly to move an intake valve between a first position where the intake valve blocks a flow of fluid and a second position where the intake valve allows a flow of fluid, the cam assembly being adapted to move the intake valve to the first position at a predetermined timing;

    sensing at least one operating parameter of the engine;

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

    engaging a valve actuator operatively with the intake valve to prevent the intake valve from returning to the first position at the predetermined timing in response to operation of the cam assembly; and

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

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