64
3-8
Adjusting Fuzzy Parameters
When overshooting or undershooting is caused once by external disturbance,
adjust the fuzzy parameters as follows:
Increase the fuzzy strength to reduce the overshooting or undershooting and
make the temperature stable. If the fuzzy strength is increased too much, tem-
perature oscillation will occur.
Fuzzy strength
Strong
Fuzzy strength
Strong
Increase the value of fuzzy scale 1 to reduce the temperature oscillation.
Fuzzy scale 1
Large
When overshooting and undershooting repeat for two cycles more due to exter-
nal disturbance, adjust the fuzzy parameters as follows:
If the second overshooting or undershooting is as large as the first, increase the
fuzzy strength. If the fuzzy strength is increased too much, temperature oscilla-
tion will occur.
Fuzzy strength
Strong
Fuzzy strength
Strong
If the second overshooting or undershooting is smaller than the first, decrease
the value of fuzzy scale 1.
Fuzzy scale 1
Small
Fuzzy Control
Section 3-6
Summary of Contents for E5ZD
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