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Pulse modulation adaptive control method for activating an electrical device

  • US 6,647,318 B2
  • Filed: 11/07/2001
  • Issued: 11/11/2003
  • Est. Priority Date: 11/08/2000
  • Status: Expired due to Term
First Claim
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1. A method for controlling a device of a facility management system, wherein the device controls an operational parameter of a building, said method comprising:

  • receiving a control signal (u) representative of a deviation in magnitude between a measured value of the operational parameter and a desired value of the operational parameter;

    defining a desired maximum amplitude of variation (D) for the measured value; and

    producing a pulsed output signal (h) that turns the device on and off, wherein the pulsed output signal is a pulse-width, pulse-frequency modulated signal having a cycle period during which a pulse of a given duration (TON) occurs, the cycle period and the given duration being dynamically calculated in response to changes in the control signal to maximize the cycle period while maintaining the amplitude of variation of the measured value equal to or below the maximum amplitude of variation (D) when the system is in a steady state pulsing condition.

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