This week we're going leave the regular Control Systems text in order to jump ahead a bit to Chapter 8 in the Parallax Process Control Text discussing PID Control. Specifically, we're going to emphasize the processes through which a microcontroller can perform Proportional, Integral and Differential calculations. I've attached a pdf of Chapter 8 here for your convenience:
Figure 8-1 on page 249 shows a block diagram of a PID Control System and Figure 8-4 on page 252 shows a typical analog circuit showing the PID control elements (op-amps, R's & C's mostly).
Our focus will be on Table 8-1 on page 272. It's attached here and printed copies will be distributed in class on 11/17.
- Table 8-1_p272.jpg (65.06 KiB) Viewed 1201 times
This table is based upon the Classical PID Formula presented on page 248 of the Process Control Text:
- Classical PID Formula.jpg (147.74 KiB) Viewed 1201 times
Our task in class will be to complete this chart and hopefully understand the calculations the BS2 will use to perform the PID calculations required in Chapter 8 experiments.
A pdf containing the above formula and graph is attached below and a hardcopy will be distributed in class on 8/17.
In addition, for reference, here is the schematic for the Incubator Circuit:
Derivative Control Mode Analogy from Wisc-Online.