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Method and apparatus for controlling multivariable nonlinear processes

  • US 5,566,065 A
  • Filed: 11/01/1994
  • Issued: 10/15/1996
  • Est. Priority Date: 11/01/1994
  • Status: Expired due to Term
First Claim
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1. A method for controlling a process having process inputs, process outputs comprising of at least one controlled variable, and an actuator affecting the process, the method comprising computing at least one manipulated variable for use by the actuator to affect the controlled variable in relation to a setpoint, the method comprising the steps of:

  • a) obtaining a set of manipulated variables;

    b) selecting a first manipulated variable from the set of manipulated variables that has not been previously selected;

    c) computing a predicted controlled variable having an associated setpoint and corresponding to said first manipulated variable as a function of the process inputs and outputs, said predicted controlled variable representing the process output as advanced by an optimum prediction time, said optimum prediction time representing the effective response time of the controlled variable to the setpoint;

    d) determining sensitivity from a change in value of the predicted controlled variable to a change in value of the corresponding first manipulated variable;

    e) determining a difference between the predicted controlled variable and the associated setpoint;

    f) incrementing the value of the first manipulated variable in relation to the sensitivity and the difference;

    g) repeating steps b) through f) for each manipulated variable from the set of manipulated variables; and

    h) repeating steps b) through g) until a predetermined condition is satisfied, said predetermined condition being the determination of the optimum prediction time wherein a minimal change in the manipulated variable is required to affect a change in the controlled variable that minimizes the difference between the controlled variable and the associated setpoint so that the difference is within a predetermined tolerance .

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