Apparatus and method in which control rules can be changed durin

Details Apparatus and method in which control rules can be changed durin Apparatus and method in which control rules can be changed durin

1997-09-15

1999-04-20

Hafiz, Tariq R.

Data processing: artificial intelligence

Fuzzy logic hardware

Fuzzy inference processing

706 3, 706 4, G06G 700

Patent

active

058954589

ABSTRACT:
In a fuzzy control apparatus in which a rule is capable of being changed during operation, a fuzzy reasoning output which prevails immediately prior to a rule change is stored when a rule change is made, and a fuzzy-control output is generated by combining, after the rule change, the stored fuzzy reasoning output which prevailed immediately prior to the rule change and a fuzzy reasoning output which prevails following the rule change. The ratio of the combination is altered in such a manner that, with the passage of time from the moment at which the rule change is made, there is a gradual decrease in a percentage of the fuzzy reasoning output which prevailed immediately prior to the rule change, and a gradual increase in a percentage of the fuzzy reasoning output which prevails following the rule change, in the fuzzy-control output. Upon passage of a predetermined time from the moment at which the rule change is made, the fuzzy reasoning output which prevails following the rule change is outputted as the fuzzy-control output. As a result, a sudden change in the output at the time of a rule change is prevented so that a smooth changeover can be carried out.

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