Method of evaluating a set of linguistic rules

Claim 1

A device for creating an output signal for controlling an external object in accordance with input signals using a plurality of fuzzy rules wherein each of the fuzzy rules of said plurality of fuzzy rules includes a premise with one or more linguistic statements about the input signals and a conclusion with one linguistic statement about the output signal, said device comprising: a) at least one storage unit for storing a plurality of fuzzy rules; b) a plurality of generating units for generating amplitude signals by defuzzifying said linguistic statements about said output signals; c) a plurality of first processing units for receiving said input signals and generating membership signals by fuzzification; d) a plurality of second processing units for receiving said membership signals and generating intermediate signals; e) a plurality of multiplier units for receiving said intermediate signals and said amplitude signals and generating product signals; f) an adder unit for receiving the said product signals and generating the output signal by adding said product signals; and g) an actuator for controlling said external object in accordance with said output signal; wherein a linguistic hedge of each input signal forms a fuzzy information system, such that, for each possible input signal the sum of membership signals for all membership functions associated with the linguistic statements about the input signal always equals 1; wherein, the linguistic statements in a premise of each fuzzy rule are always linked in an AND relationship; wherein, the linguistic statements in the premise of each fuzzy rule refer to pairwise different input signals; wherein, the plurality of rules is complete, such that, for each possible combination (statement 1 , . . . , statement n )n of linguistic statements, where n is the number of input signals, such that for each i out of the set {1, . . . , n} statement i refers to the i th input signal, there exists one rule R k among said fuzzy rules whose premise is composed exclusively of linguistic statements from the set (statement 1 , . . . , statement n ); and wherein, the plurality of rules is consistent, such that, for each possible combination (statement 1 , . . . , statement n ) of linguistic statements, there is at most one rule R k among said fuzzy rules whose premise is composed exclusively of linguistic statements from the set (statement 1 , . . . , statement n ).

Claim 2

A device for creating an output signal for controlling an external object in accordance with input signals using a plurality of fuzzy rules wherein each of the fuzzy rules of said plurality of fuzzy rules includes a premise with one or more linguistic statements about the input signals and a conclusion with one linguistic statement about the output signal, said device comprising: a) at least one storage unit for storing a plurality of fuzzy rules; b) a plurality of generating units for generating amplitude signals by defuzzifying said linguistic statements about said output signals; c) a plurality of first processing units for receiving said input signals and generating membership signals by fuzzification; d) a plurality of second processing units for receiving said membership signals and generating intermediate signals; e) a plurality of multiplier units for receiving said intermediate signals and said amplitude signals and generating product signals; f) an adder unit for receiving the said product signals and generating the output signal by adding said product signals; and g) an actuator for controlling said external object in accordance with said output signal; wherein a linguistic hedge of each input signal forms a fuzzy information system, such that, for each possible input signal the sum of membership signals for all membership functions associated with the linguistic statements about the input signal always equals 1; wherein, the linguistic statements in a premise of each fuzzy rule are always linked in an AND relationship; wherein, the linguistic statements in the premise of each fuzzy rule refer to pairwise different input signals; wherein, the plurality of rules is complete, such that, for each possible combination (statement 1 , . . . , statement n )n of linguistic statements, where n is the number of input signals, such that for each i out of the set {1, . . . , n} statement i refers to the i th input signal, there exists one rule R k among said fuzzy rules whose premise is composed exclusively of linguistic statements from the set (statement 1 , . . . , statement n ); and wherein, the plurality of rules is consistent, such that, for each possible combination (statement 1 , . . . , statement n ) of linguistic statements, there is at most one rule R k among said fuzzy rules whose premise is composed exclusively of linguistic statements from the set (statement 1 , . . . , statement n ).