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CONTROL SYSTEM AND METHOD FOR PREVENTING DESTRUCTIVE COLLISIONS IN FREE PISTON MACHINES

  • US 20020189433A1
  • Filed: 06/15/2001
  • Published: 12/19/2002
  • Est. Priority Date: 06/15/2001
  • Status: Active Grant
First Claim
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1. An improved control system for a free piston machine, having a piston reciprocating in linear oscillation within a cylinder, the cylinder having at least one cylinder end structure, the machine also having a negative feedback control system controlling a piston force, the control system including a summing junction to which a feedback signal and a control input signal are applied for deriving an error signal, wherein the improvement comprises:

  • (a) a collision detector for detecting a collision of the piston against the cylinder end structure and generating a signal at an output in response to a detected collision;

    (b) a signal generator for generating a perturbation signal and having its input connected to the output of the collision detector and its output connected to the summing junction.

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