pid equation????????????

[irshadhm]

hi
any one can tell me the controll out put equation of a pid,i am using the conventional pid equation that studied from text books,but it is not working practically in a control field

please help me
thanking u

 

[Jason_Guo]

Are you use C language to control a system?there are two ways of PID,one aspect of PID control is used in continuous system and another is used in discrete system.If you use MCU to contrl a
system,you can use discrete PID contrl.

 

[LvW]

hi
any one can tell me the controll out put equation of a pid,i am using the conventional pid equation that studied from text books,but it is not working practically in a control field
please help me
thanking u

What about showing us the "conventional" equation you are using? What means "not working practically"? Absolutely no control action?

 

[irshadhm]

Co=kp*e(t)+Ki*int(0-t)[e(t)]dt+Kd*d/dt(t)
MCU is using
In practically we are using our pid in temperature control,but it not giving the 100% control out put,auto tuning is done by ZNFD method