How PID Autotuning Works
To use PID autotuning, configure and deploy one of the PID autotuner blocks, Closed-Loop
PID Autotuner or Open-Loop PID Autotuner.Autotuning Process
The PID autotuner blocks work by performing a frequency-response estimation
experiment. The blocks inject test signals into your plant and tune PID gains based on an
estimated frequency response.The following schematic diagram illustrates generally how a PID autotuner block fits into
a control system.Until the autotuning process begins, the autotuner block relays the control signal directly
from u to the plant input at u+Δu. In that state, the module has no effect on the
performance of your system.When the autotuning process begins, the block injects a test signal at u out to collect
plant input-output data and estimate frequency response in real time.- If you use the Open-Loop PID Autotuner block, the block opens the feedback loop
between u and u+Δu for the duration of the estimation experiment. It injects into u
+Δu a superposition of sinusoidal signals at frequencies [1/3, 1, 3, 10]ωc, where ωc is
8 PID Autotuning