Auto-tuning is in the pdf of the user manual for the nv enails. It says it has 3 modes.
Note 2:
This controller has 3 types of auto-tuning control
methods already built-in:
0: Universal PID control suitable for increase/dec
rease fast speed of change of temperature
application.
1: Gradual change PID control is suitable for appl
ications that require steady change of
temperature and speed of temperature change is not
critical.
2: Fuzzy logic control suitable for system with os
cillation and sensing signal delay.
Later it says,
5. Auto-Tuning
By simply pressing a single button, the built-in ar
tificial intelligent is activated to automatically
calculate and set parameters ( P, I, d, SF, Bb, Ot
) that fit the condition to be controlled.
I don't know what all that means. I've never used an enail.