help to find control system element equation
help to find control system element equation
(OP)
hello everybody,
i am looking for a little help because i am so confuse. i have a second order transfer function system which i need to model in sumulink. i am making a temperature pid controller. i am using a heating element which is the process. how can i find out the process function/equation? i know how to work out equation from a electrical circuit, but i don't know how to work out the equation for a heating element.
please tell me if it doesn't make any seance to you.
thanks
i am looking for a little help because i am so confuse. i have a second order transfer function system which i need to model in sumulink. i am making a temperature pid controller. i am using a heating element which is the process. how can i find out the process function/equation? i know how to work out equation from a electrical circuit, but i don't know how to work out the equation for a heating element.
please tell me if it doesn't make any seance to you.
thanks





RE: help to find control system element equation
If you really want to model the temp sensor dynamics you can use a first order differential equation like
dT/dt=k*T(t)
The solution is a natural exponential function.
Although, many sensors may behave differently.
Fe (IronX32)
RE: help to find control system element equation
what i came up with to use the phisical process to see the feedback output. make a graph and use those value to do the transfer function, am i right?
one more thing my input is duty cycle and set point is degree C. how are they related? i can use labview to tune and make the control system in no time, but i need to understand how come the input and set point is two different type, and how can i explain it.
RE: help to find control system element equation
Mark Hutton