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SYSTEM AND METHOD FOR IMPROVED CAM RETARD

  • US 20080035084A1
  • Filed: 08/02/2006
  • Published: 02/14/2008
  • Est. Priority Date: 08/02/2006
  • Status: Active Grant
First Claim
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1. A system for regulating flow to a cylinder of an internal combustion engine, the system comprising:

  • a valve operating mechanism capable of opening at least one intake valve at an opening position that is after top-dead-center, relative to an intake stroke of a cylinder, said intake valve opening position also being in advance of a closing of an exhaust valve in said cylinder;

    a cam profile switching device that is capable of changing the amount of intake valve lift produced by said valve operating mechanism; and

    a controller constraining cam retard so that a desired level of manifold vacuum is observed when said cam profile switch is in a low lift position and when said valve operating mechanism is in a retarded position wherein the opening of said at least one intake valve is after top-dead-center, relative to the intake stroke of said cylinder, and where the opening of said at least one intake valve is in advance of the exhaust valve closing in said cylinder.

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