Performance analysis of various Smith predictors for integrating processes with longer dead-time

G. Saravanakumar, R. S D Wahidabanu, C. G. Nayak

Research output: Contribution to journalArticlepeer-review


Processes that contain a large transport lag[exp (-τDS)] can be difficult to control because a disturbance in set point or load does not reach the output of the process until τD units of time have elapsed. The control strategy known as dead-time compensating controller is also referred to as a Smith predictor. The control algorithm in a Smith predictor is normally a PI controller. This paper describes the advantage of modified Smith predictors which has the advantage over the dead-time compensating controllers. Although it contains five parameters, only three are adjusted by the operator namely the gain, the integral time and the dead-time. The controller is also suited for processes with varying longer dead-times and can be tuned manually in the same way as a PID controller and has the advantage over the other Smith predictor based controllers.

Original languageEnglish
Pages (from-to)248-263
Number of pages16
JournalInternational Journal of Automation and Control
Issue number2-3
Publication statusPublished - 09-06-2009

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture
  • Software
  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering


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