Systems and methods for control of two-stage valve tappets

  title={Systems and methods for control of two-stage valve tappets},
  author={Joshua D. Cowgill and Donovan L. Mich. Dibble and Scot A. Douglas},
A valve plunger control system includes a valve stem control module and a forced transfer determination module. The valve lifter control module determines a desired stroke state of a valve lifter on the basis of an engine speed and / or engine load. Forced transition determination module directs a forced transition of the valve stem from the low lift state to the high lift state on the basis of a manifold vacuum irrespective of the desired lift state. 

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