JPH0296242A - State display device for 2-input fuzzy inference - Google Patents

Abstract

PURPOSE:To easily specify a proposition to be changed in a rule and also to easily control this proposition by allocating the information display areas of each fuzzy rule in the positional relation similar to that of an area to which the front condition part of a fuzzy rule primarily takes charge of through an input plane. CONSTITUTION:A 2-input display device attachment surface 14 is divided horizontally and vertically into 5 steps of fuzzy labels, i.e., NL, NS, ZR, PS and PL respectively in terms of both inputs X and Y. Thus the surface 14 is divided into 25 areas in all, and each of these areas has a fuzzy rule. Then a display device 3 is prepared to each area to emit the light in response to the membership value of the front condition part o;f the corresponding fuzzy rule. A display device 15, for example, serves as a display device for fuzzy rules which primarily takes charge of the area ZR with X and the area NL with Y respectively and corresponds to a fuzzy rule shown in an equation I since to slide volume is set at the left and position. The left end position where the slide volume is set corresponds to the large negative value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display device in a fuzzy inference device.

[Conventional technology]

In conventional fuzzy inference devices, the fuzzy inference process is displayed on a display device with the following functions.

(1) The output membership functions obtained by inference using each fuzzy rule are synthesized using CMAX, and the resulting membership function is displayed.

(2) Display the output membership functions of each fuzzy rule in sections on the display screen.

[Problems with conventional technology]

The above display device has the following problems.

Since the antecedent part of each fuzzy rule is not displayed in association with the area it is primarily responsible for in the space spanned by the input (input space), it is difficult to understand the relationship of each fuzzy rule in the input space. Therefore, when debugging or adjusting fuzzy rules, it is important to understand which of the propositions forming the fuzzy rules should be changed, and to determine the set of fuzzy rules that need to be balanced (for example, the fuzzy rules to be focused on and the input space It was difficult to understand the set of adjacent fuzzy rules).

[Problem to be solved by the invention]

The present invention has been made by focusing on the problems of the prior art, and aims to solve the following problems.

(1) The area to which the antecedent part of each fuzzy rule is primarily responsible in the space spanned by the input (input space) should be clearly understood.

(2) Make it clear which fuzzy rules are adjacent to the area in charge of the input space.

[Means to solve the problem]

In order to solve the above problems, the present invention (when there are two inputs used for Mafuzzy inference), the space spanned by the inputs is limited to a two-dimensional surface, and that surface is used as a two-dimensional display surface. Then, the information display area of each fuzzy rule was arranged in a positional relationship similar to the positional relationship of the area in which the antecedent part of each fuzzy rule is mainly in charge on the two-dimensional surface stretched by input.

〔effect〕

The effects of this invention are as follows.

(1) You can clearly see the area that the antecedent part of each fuzzy rule is mainly responsible for in the space spanned by the input, so
Propositions to be changed in fuzzy rules that should be changed when debugging and adjusting fuzzy rules can be easily understood.

(Since the set of fuzzy rules whose main areas of responsibility are adjacent in the two-input space becomes clear, the fuzzy rules to be balanced can be easily grasped, and the fuzzy rules can be easily adjusted.

〔Example〕

FIG. 1 is an external view of a two-input fuzzy inference device. 1 is an indicator that lights up according to the antecedent output membership value of the fuzzy rule.

2 is a two-input fuzzy inference device. 3 is a sliding volume for setting the membership function of the consequent part of the fuzzy rule.

FIG. 2 is a block diagram showing the electrical configuration of the two-input fuzzy inference device. 4 is a fuzzy rule module that generates an output membership function according to the inputs X and Y, and inputs it to the CMAX circuit 5. Here R11,...
, R55 are all fuzzy rule modules having a similar structure, and each output membership function is input to the CMAX circuit 5. 5 is a CMAX circuit, which performs MAX synthesis of the membership functions output from each fuzzy rule module (R11, . . . , R55) and outputs the result.

6 is a defassifier that outputs the center of gravity of the membership function output from the CMAX circuit. FIG. 3 is a block diagram showing the electrical configuration of the fuzzy rule module 4. 5 is a label register for storing fuzzy labels constituting the fuzzy rule antecedent part. Reference numeral 6 denotes a membership value generation circuit that generates an input membership value for the fuzzy label indicated by the label register 5. 7 is a MIN circuit that generates the MIN value of the membership value of each proposition of the antecedent part and outputs it as the membership value of the antecedent part. 3 is a sliding volume for adjusting the position of the consequent membership function of the fuzzy rule. Reference numeral 9 denotes a membership function generator (MFG) for outputting the consequent membership function to a position set by the slide type volume 3. Reference numeral 10 denotes a truncation circuit for making the maximum value of the membership function output from the MFG 9 less than or equal to the antecedent membership value output from the MIN circuit 7. Reference numeral 11 denotes an integrator that integrates the antecedent membership value output from the MIN circuit 7. 1 is an indicator that emits light according to the integrated output value of the integrator 11. FIG. 4 is a diagram showing an example of another two-input fuzzy inference status display device.

12 is a CRT display. 13 is fuzzy rule information drawn on the screen of the CRT display. Information on each fuzzy rule is displayed so as to surround the area mainly in charge of the antecedent part of each fuzzy rule, regarding this screen as a plane covered by inputs used for fuzzy inference.

FIG. 1 shows the display mounting surface 1 of the two-input fuzzy inference device 2.
4 is considered to be the input plane, and the display corresponding to each fuzzy rule is arranged on this display mounting surface 14 so that the antecedent part of each fuzzy rule is located in the area mainly in charge of the input plane. There is. On the display mounting surface, the display device is arranged with an axis for input X in the horizontal direction and an axis for input Y in the vertical direction. Input X.

The values of both Y and Y are divided into five levels of fuzzy labels as shown below.

NL (Negative Large): Large negative value NS (Negative Large):
Small negative value ZR (ZeRo): Zero PS (Pos
tive Small): Small positive value PL (Positive Large): Large positive value The display mounting surface 14 has the above-mentioned five-level fuzzy label (NL, NS, Z4°R, PS, PL) with respect to the input X in the horizontal direction. In the vertical direction, input Y is divided into the five levels of fuzzy labels described above, forming 25 regions. There is a fuzzy rule corresponding to each area, and an indicator 3 that emits light according to the antecedent membership value of the corresponding fuzzy rule is arranged in each area. For example, the display 15 displays Z for X.
For R and Y, it is a fuzzy rule display that is mainly in charge of the NL area, and the slide volume is at the left end (
(corresponding to a large negative value), it corresponds to the fuzzy rule shown by equation (1).

if X-ZR＆Y-NL thenZ -N
L (1)

[Brief explanation of the drawing]

FIG. 1 is an external view of a two-input fuzzy inference device. FIG. 2 is a block diagram of a two-input fuzzy inference device. FIG. 3 is a block diagram of the fuzzy rule module. FIG. 4 is a display example using a CRT display. 1: Display device, 2: 2-input fuzzy inference device. 3 Nislide volume, 4: Fuzzy rule module, 5 Nilabel register, 6: Membership value generation circuit, 17 MIN circuit, 9: Membership function generator, 10: Truncation circuit, 11: Integrator, 12: 017 screen, 13 :Fuzzy rule information on CRT display, 14:Outside view of input array theory while display is attached.Patent applicant: Tateishi Electric Co., Ltd.Figure 2 input file? Jin Gong 1st SL professional, Ri 2nd District

Claims (1)

[Claims] (1) In a fuzzy inference device that performs fuzzy inference using two inputs, the antecedent part of the fuzzy rule is mainly responsible for the area on the input plane (the plane spanned by the two inputs). A state display device for two-input fuzzy inference, characterized in that display areas for information on each fuzzy rule are arranged in the same positional relationship as the positional relationship.