You'll need a pressure transducer for a start, and an A to D converter or voltage to frequency converter (if your PIC doesn't have A to D.) You need to start with your Command value and compare it to your Feedback value to get an Error. Command = What I want (Example 5 Bar) Feedback = What I have (Example 3.8 Bar) Error = Difference between the two (1.2 Bar) Then put this Error through your PID algorithm to generate your pulse width settings. Burgmuller Op 109 Pdf Download. With these example values the PID algorithm would have to INCREASE the output until the pressure is 5 Bar. (If the feedback was 6 Bar then the output must DECREASE).
Seeyou Registration Key Keygen Mac. ORIGINAL: dubble out=Ar*error+Ad*(error-previouserror)+integral; integral=integral+error; //integration is summing in discrete systems This is the basic PID controller code. Ar is the propoltional gain parameter. Ad is the derivative term's parameter, so called damping. Integral is the integral term, it reduce oscillation near 0 point. You should also select the sampling time. I think you missed the integral gain term.
This is probably easiest multiplied times error before you add it to running integral. It is usually a good idea to ad anti windup to the integral, to limit its value to only what will saturate the output, or to limit it to what will push the output past saturation by no more than error*Ar. This limit will improve the recovery time after saturated output occurs. This subject is very big and can sometimes get very complicated. I only understand the basics, but enough to get.
It would take alot of pages to explain everything and I don't have the time to write so much. Where do you live in Germany?
I live near Ulm in the South, if you live nearby I could meet you in a pub and spend an hour or two going over the basics. If it's too far, then you'll need to read up on Control loops, decide what you need to do on paper then transfer that to a control algorithm.
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