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Modulating controller for controlling two operation terminals

  • US 5,490,058 A
  • Filed: 02/25/1993
  • Issued: 02/06/1996
  • Est. Priority Date: 02/28/1992
  • Status: Expired due to Fees
First Claim
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1. A modulating controller for controlling a process amount by controlling first and second operation terminals disposed in parallel comprising:

  • sensing means for detecting the process amount;

    difference operation means for providing a difference signal representing a difference between the process amount detected by said sensing means and a process amount set signal;

    control operation means for receiving the difference signal from said difference operation means and for outputting a first control operation signal;

    signal generating means for generating a second control operation signal;

    first signal switching means, corresponding to said first operation terminal, for receiving and switching between outputting a first adding result signal and the second control operation signal, and for outputting a first operation terminal control signal to said first operation terminal;

    second signal switching means, corresponding to said second operation terminal, for receiving and switching between outputting a second adding result signal and the second control operation signal, and for outputting a second operation terminal control signal to said second operation terminal;

    first difference operation means for providing as a first difference signal a difference between said first control operation signal and the second operation terminal control signal outputted by the second signal switching means;

    second difference operation means for providing as a second difference signal a difference between said first control operation signal and the first operation terminal control signal outputted by the first signal switching means;

    adjusting means for outputting said second difference signal unchanged and for retaining the second difference signal when either of said first and second signal switching means outputs the second control operation signal, and for outputting a signal shifting toward zero from a value of the retained signal when said one of the first and second signal switching means outputting the second control operation signal switches to output said first or second adding result signal;

    first addition means for adding said first difference signal and said first control operation signal and for outputting the first adding result signal to said first signal switching means; and

    second addition means for adding the output of said adjusting means and said first control operation signal and for outputting the second adding result signal to said second signal switching means.

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