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Process control apparatus for temperature control

  • US 3,922,535 A
  • Filed: 11/12/1970
  • Issued: 11/25/1975
  • Est. Priority Date: 11/12/1970
  • Status: Expired due to Term
First Claim
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1. An apparatus for controlling the operation process of a system according to a predetermined operating cycle comprising a first means providing a slope signal representing a rate of change that said process is to be varied during Said operating cycle, an integrator coupled to said first means for generating an integrated signal having an amplitude proportional to the time integral of said slope signal, second means providing a steady state signal representing the end point of said operating cycle, a comparator, means for supplying said integrated signal to said comparator, means for supplying said steady state signal representing said end point to said comparator to be compared with said integrated signal, said comparator including means for generating a compared signal indicating whether said integrated signal is as large as said steady state signal, a switching circuit having an output, a controller coupled between said output of said switching circuit and said physical system, means for coupling said means to said switching circuit, means for coupling said integrator to said switching circuit, means for coupling said comparator to said switching circuit for causing said switching circuit to couple either said integrated signal or said steady state signal representing said end point to said controller, and said controller varying the operation of said physical system according to said signal supplied thereto.

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