Autotuning of PID Controllers: A Relay Feedback Approach by Cheng-Ching Yu

By Cheng-Ching Yu

Recognising some great benefits of stronger keep an eye on, the second one version of Autotuning of PID Controllers offers easy but powerful tools for bettering PID controller functionality. the sensible problems with controller tuning are tested utilizing a number of labored examples and case stories in organization with particularly written autotuning MATLABВ® courses to bridge the space among traditional tuning perform and novel autotuning methods.

The largely revised moment variation expands and refines on vital paintings within the ubiquitous PID type of regulate with fabric covering:

  • Derivation of analytical expressions for relay suggestions responses with tabulated effects for simple reference.
  • The use of shapes of relay responses to generate info for more suitable closed-loop regulate and function evaluate.
  • The purposes of autotuning to multiple-model-based instances for dealing with technique nonlinearity.
  • The use of suggestions shapes to generate details for functionality evaluation.
  • The influence of imperfect actuators on controller performance.

Autotuning of PID Controllers is greater than only a monograph, it truly is an self sustaining studying device appropriate to the paintings of educational keep an eye on engineers and in their opposite numbers in trying to find more advantageous approach regulate and automation.

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Comments at the first edition:

This ebook is written in a manner which not just makes it effortless to appreciate yet can be helpful to these attracted to or operating with PID controllers. Assembly Automation

The booklet may be priceless to brands and clients of keep watch over gear, and in addition to researchers within the box of automated tuning. Automatica

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Extra resources for Autotuning of PID Controllers: A Relay Feedback Approach

Example text

9. Shifted version of relay input u and output y response of a typical SOPDT system Relay Feedback 39 generalized response term y n slowly forms a convergent series. # , where K p is the steady state gain,  1 and  2 are process time constants with  1 >  2 , and D is the dead time. 8B), the first segment of the relay response y1 is simply the step response without dead time in the time index: a1 = y 1 = K p 1  a1e  t /  1 + b 1e t /  2 #! 25) At the second instant, the time is reset to zero at the initial point.

3 for the results. 40 Autotuning of PID Controllers t P t    D + Pu / 2 !   u  y 3 = K p [1  2 + 2]  a1e  1 × e  1  2e 2 1 + 2 " + b 1e  2   # D + P / 2 P   u ! 27) It can be seen that the terms in the right-hand side (RHS) of the above equation are slowly forming a series. With the progress of time, the response becomes stabilized and the general expression for the nth term can be described as D + ( n  2 ) Pu / 2 t     1 y n = K p  [1  2 + 2    ]  a1 e  1  e   2 e  ( n  2 ) Pu 2 1 + 2e  ( n 1) Pu 2 1    + 2e  Pu 2 1 !

1 2 + b1e  1  a 1e "   # t P /2 t P /2 ! t t    + u  + u   1 2  2 1  a 1e + b 1e " + 2 1  a1 e  1 + b 1e  2  #  ! 3 for the results. 40 Autotuning of PID Controllers t P t    D + Pu / 2 !   u  y 3 = K p [1  2 + 2]  a1e  1 × e  1  2e 2 1 + 2 " + b 1e  2   # D + P / 2 P   u ! 27) It can be seen that the terms in the right-hand side (RHS) of the above equation are slowly forming a series. With the progress of time, the response becomes stabilized and the general expression for the nth term can be described as D + ( n  2 ) Pu / 2 t     1 y n = K p  [1  2 + 2    ]  a1 e  1  e   2 e  ( n  2 ) Pu 2 1 + 2e  ( n 1) Pu 2 1    + 2e  Pu 2 1 !

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