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Systems of recording piston rod position information in a magnetic layer on a piston rod

  • US 7,034,527 B2
  • Filed: 10/25/2005
  • Issued: 04/25/2006
  • Est. Priority Date: 05/06/2003
  • Status: Expired due to Term
First Claim
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1. A piston rod position sensing system, comprising:

  • a cylinder;

    a piston rod arranged in the cylinder for movement with respect thereto;

    a magnetically hard layer formed on the piston rod to provide a recording medium, a magnetic pattern being recorded in the magnetically hard layer; and

    a magnetic field sensor located in the cylinder to sense the recorded magnetic pattern while the piston rod is moving with respect to the cylinder and to generate signals in response to the sensed magnetic pattern that are used to determine an instantaneous position of the piston rod.

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