In this paper ARX estimation methodology used to design a PID controller  for  temperature control of the air heater. The step input applied on heating systems and logging the  data  toMATLAB via a data acquisition system. The data obtained is used to identify the model of the processin the form of ARX. PID parameters obtained by minimising a standard  integral errors using theleast squares  method. Then,  the results were compared with the classical methodsKeywords:  PID, Identification,  air heater
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