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Multimode electronic brake monitor system

  • US 4,161,649 A
  • Filed: 12/21/1977
  • Issued: 07/17/1979
  • Est. Priority Date: 12/21/1977
  • Status: Expired due to Term
First Claim
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1. An electronic brake monitor for determining when the braking time of a machine having a reciprocating member and means for braking said member and means for initiating said braking means exceeds at least one of a plurality of preset braking times, comprising:

  • (a) encoder means coupled to said member for providing an output corresponding to the absolute position of said member;

    (b) a generator for producing clock pulses;

    (c) a digital counter connected to said generator and enabled to accumulate clock pulses in response to said initiating means;

    (d) preset means responsive to said encoder output and said initiating means for establishing at least a first and second mutually independent preset braking times, and for selection of a first preset braking time when said member is moving in an upstroke direction and for selection of a second preset braking time when said member is moving in a downstroke direction;

    (e) memory means connected to said counter and responsive to changes in said encoder output for accepting the accumulated contents of said counter;

    (f) comparator means connected to said preset means and to said memory means for producing an alert condition when the contents of said memory means exceeds said selected preset braking time.

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