Omron Corporation

Hajime Nishidai

Nobutomo Matsunaga

Atsushi Irie

Naohiro Tabata

Hideji Ejima

Susumu Ishiguro

Hiroshi Soma

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.

Apparatus and method in which control rules can be changed during fuzzy

Fault detecting apparatus and method

Fuzzy control apparatus in which rules can be changed, method of

A plurality of rules each constituted by providing pairs of input variables and membership functions in its antecedent and a pair of an output variable and a membership function provided in its consequent are set in a RAM. Antecedent processing is executed for each input variable in such a manner as to perform antecedent processing, when input data is received, with regard to all rules to which an input variable of the received input data is related. Then antecedent processing is performed when another input data for another input variable received with regard to all rules to which such another input variable of the received input data is related. Consequently, fuzzy reasoning processing is efficiently performed.

Fuzzy reasoning processor and method, and rule setting apparatus and

In the antecedents of a group of fuzzy reasoning rules, a proposition x1=PL which appears the most frequently is extracted, and one group consisting of Rules 1, 2, 6, 8, 9 which contain this proposition is formed. Rule 8, in which only the proposition x1=PL is contained in its antecedent, is placed at the beginning of an array of rules. In the Rules 1, 2, 6, 9 which remain, a proposition x2=PM which appears the next most frequently is extracted, and a sub-group consisting of Rules 1, 6, 9 which contain this proposition is formed. The rules of this sub-group are arranged in a fixed order following the Rule 8. The remaining Rule 2 is placed next in the array. Processing is performed in similar fashion with regard to other Rules 3, 4, 5, 7, 10. By thus rearranging rules in accordance with a sequence which includes propositions having a high frequency of appearance, redundant processing regarding redundant propositions is eliminated and processing is made more efficient.

Method of rearranging and method of coding fuzzy reasoning rules, and

The invention relates to a signal processor to be built into a controller or the like for receiving various input signals and generating control signals according to the input signals. The signal processor includes an internal bus interconnecting various components of the signal processor. The invention also includes a first input-output controller for controlling the application of input signals to the signal processor and the output of control signals from the signal processor. The first input-output controller operates under the control of a switch in which the switching criteria for the switch is whether or not the signal processor is using its internal bus. Accordingly, the first input-output controller is allowed access to the signal processor depending on whether or not the internal bus of the signal processor is being used.

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Kyoto, Japan

Hajime Nishidai