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Facility management system with improved return to automatic control

  • US 5,184,122 A
  • Filed: 01/31/1991
  • Issued: 02/02/1993
  • Est. Priority Date: 01/31/1991
  • Status: Expired due to Fees
First Claim
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1. A control system wherein said automatic control means is of type which controls a parameter to maintain said parameter at a given set point, said control system comprising:

  • device means responsive to an automatic signal when under automatic control or a manually selected control signal when under manual control for effecting said parameter;

    sensor means for sensing the level of said parameter and providing a feedback signal responsive to said sensed parameter level;

    automatic control means coupled to said sensor means and being responsive to being coupled to said device means for generating an automatic control signal for said device means having a level derived from the sum of integral, derivative, and proportional actions to said feedback signal for automatically controlling said device means;

    interface means coupled between said automatic control means and said device means for coupling said automatic control means to said device means to place said device means under automatic control and for decoupling said automatic control means from said device means for placing said device means under manual control of a manually selected control signal; and

    said automatic control means being responsive to being decoupled from said device means by said interface means for terminating the generation of said automatic control signal and arranged for providing said automatic control signal to said device means at an initial level based upon the level of said manually selected control signal upon being recoupled to said device means by said interface means.

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