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Adaptive sampled-data controller

  • US 4,232,364 A
  • Filed: 12/18/1978
  • Issued: 11/04/1980
  • Est. Priority Date: 12/18/1978
  • Status: Expired due to Term
First Claim
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1. In a loop for controlling a parameter of a process variable in which a controller compares the parameters with a set point value and produces an output control signal proportional to the difference between the parameter and the set point, the improvement comprising:

  • a digital controller;

    a digital memory having stored therein a plurality of separate control algorithms;

    means for continuously sampling the value of the set point at predetermined intervals;

    means coupled to said sampling means for storing the sample set point values;

    means coupled to said storing means for adding each sample value to a previous sampled value in order to obtain an algebraic difference between said stored values;

    means coupled to said adding means for comparing said algebraic difference with predetermined criteria, said comparing means producing a characteristic output when said algebraic difference meets said criteria;

    means coupled to said comparing means for selecting one of said stored algorithms and for coupling said algorithm to said digital controller to govern the operation thereof.

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