Method of and apparatus for controlling a process

Details Method of and apparatus for controlling a process Method of and apparatus for controlling a process

G - Physics

05

B

G05B 11/30 (2006.01) F25B 49/04 (2006.01) G05B 13/02 (2006.01)

Patent

CA 2175739

The present invention relates to a method of controlling an output variable of a process having long dead times and delay times, for example for controlling the interior temperature of an abosrber refrigerator, and also relates to an apparatus for carrying out such a method. The output variable of the process, such as the interior temperature, is sampled and compared with a desired value in order to determine a desired value deviation. In dependence on the determined desired value deviation, a manipulated variable, such as the power supplied to the absorber, is calculated in such a manner that the output variable of the process is brought near to the desired value. After the lapse of a waiting time, a value of the manipulated variable is newly determined. During the waiting time, the manipulated variable is not altered. The waiting time is calculated on the basis of the difference between the value of the manipulated variable and an earlier value of the manipulated variable. A controller for carrying out the method comprises a memory for an earlier calculated manipulated variable and a timer which is designed to receive the earlier calculated value of the manipulated variable and the current value of the manipulated variable, to calculate a waiting time from these and, after the lapse of this waiting time, to start a new calculation of a value for the manipulated variable.

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