JPH0452927A - fuzzy controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to fuzzy (F
This invention relates to a fuzzy control device used for fuzzy (fuzzy) control.

[Conventional example] Recently, fuzzy theory has been applied to various devices, and fuzzy controllers (fuzzy chips) have become available at low cost. Furthermore, fuzzy controllers can be used without any knowledge of fuzzy operations, and a fuzzy control system can be constructed simply by writing empirical rules (fuzzy rules) according to certain rules. Since it is possible to increase speed, it is incorporated into control devices such as process control and home appliances.

By the way, as shown in FIG. 4, the simplest fuzzy controller 1 has two inputs and one output. When this fuzzy controller 1 is incorporated into a device control device, when determining the variables in the condition part and conclusion part of the empirical rule (IF-THEN rule) according to the controlled object, the empirical rule is For example, as shown in the table above, up to 25 empirical rules can be created.

Expressing the above table as a formula: (1) IF input 1 = PB AND (2) IF input 1 = PB AND (3) IF human power 1 = PB AND (4) IF human power 1 = PB AND (5) IF human power 1 = PB AND (6) IF human power 1 = PS AND Input 2 = PS THEN Input 2 = PS THEN Input 2 = ZRTl (EN Input 2 = NS THEN Input 2 = NB THEN Input 2 = PB THEN Output = PS Output = PB Output =PB Output=PB Output=PB Output=ZR (7) IF human power 1=PS AND input 2=PS TH
EN output = ps (23) IF human power 1 = NB AND
Input 2 = ZRTHEN output = NB (24) IF human power 1 =
NB AND human power 2 = NS THEN output = NS (25
)IF Human power 1=NB AND Input 2=NB THE
Ntb force=ZR. In addition, in the above table and formula, PB is Po5itive Big (large), and p
s is Po5itive Small (slightly large),
ZR is Zero (zero), NS is NegativeS
mall (slightly small), NB is Nsgative
Big (small), and from the empirical rule (8) to (22
) is omitted because it can be expressed similarly from the table above.

After determining and creating the condition part and conclusion part of the optimal heuristic in this way, the fuzzy controller manufacturer writes the optimal heuristic in the memory of the fuzzy chip, allowing this fuzzy chip to become the controller for the first time. (fuzzy control device).

[Problems to be Solved by the Invention] However, in the above fuzzy control device, according to the empirical rules written in the fuzzy controller 1,
Since input 1 and input 2 are calculated and the result of the calculation is outputted, it cannot be used for other devices that are controlled differently, that is, have different empirical rules.

Furthermore, even for the same equipment, it is often extremely difficult to create optimal heuristics from the beginning.Furthermore, heuristics are created according to certain rules of fuzzy theory; The reality is that experts who create fuzzy controls study fuzzy theory and create empirical rules for fuzzy control operation. Even with this in mind, it is very inconvenient that the fuzzy rules cannot be changed when using the fuzzy controller 1, so it is necessary to be able to change them easily.

This invention was made in view of the above problems, and its purpose is to enable fuzzy control of different control targets, and
It is an object of the present invention to provide a fuzzy control device that can easily change empirical rules and improve the efficiency of creating the empirical rules.

[Means for Solving the Problems] In order to achieve the above object, the present invention stores fuzzy rules and calculates M for input values according to the rules.
A fuzzy control device that performs logical operations such as IN operation and center of gravity calculation, and performs fuzzy control of equipment based on the results of these operations, includes a rewritable fuzzy rule storage section that stores the above-mentioned fuzzy rules, and this fuzzy rule storage. a display device for displaying the fuzzy rules stored in the fuzzy rule storage section; and a fuzzy rule for changing the fuzzy rules displayed on the display means and rewriting the fuzzy rules in the fuzzy rule storage section with the changed fuzzy rules. The present invention is characterized in that it is equipped with a rewriting device and that the fuzzy rules of the fuzzy control described above can be changed.

[Operation] With the above configuration, the fuzzy rules stored in the fuzzy rule storage section of the fuzzy controller are displayed on the display section of the fuzzy rule display device. Further, a cursor is displayed on the display section, and this cursor can be moved to an arbitrary position by operating left/right, up/down keys of a part of the cursor key provided in the fuzzy rule rewriting device. Further, data at the cursor position is rewritten by operating some data keys of the fuzzy rule setting key provided in the fuzzy rule rewriting device.

After displaying the desired fuzzy rule on the display section in this way, when the update instruction key provided in the fuzzy rule rewriting device is operated, the fuzzy rule displayed on the display section will be updated to the corresponding fuzzy controller. is written to the fuzzy rule storage section of . That is, the contents of the fuzzy rule storage section can be rewritten, and the fuzzy rules to be rewritten can be created on the display screen of the fuzzy rule display device. Therefore, when the above-mentioned fuzzy control device is incorporated into a device control device to perform fuzzy control, even if the control target is different,
Fuzzy control becomes possible, and the optimum empirical rule for fuzzy control can be easily created, and the creation efficiency can be improved.

[Embodiment] Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 3.

In FIG. 1, the fuzzy control device includes a fuzzy controller 3 having a fuzzy rule storage section 2 of a memory (for example, RAM) in which empirical rules (fuzzy rules) can be rewritten, and a display section for displaying the empirical rules. (For example, on the CRT screen or LCD screen shown in FIG. 2) The fuzzy rule display device 4 displays the fuzzy rules on the display section 4a, and the fuzzy rule storage section 2 uses the rewritten fuzzy rules. A fuzzy rule rewriting device 5 for rewriting the contents of is provided.

As shown in FIG. 2, the display section 4a of the fuzzy rule display device 4 displays the empirical rules written in the fuzzy rule storage section 2 in a predetermined format (for example, a table), and A cursor 4b is displayed at an arbitrary position.

Also, as shown in Figure 3, there is a fuzzy rule rewriting bag! 5 includes a cursor key part 5a equipped with left/right and up/down keys for moving the cursor 4b displayed on the display section 4a to a predetermined position, and a cursor key part 5a equipped with left/right and up/down keys for moving the cursor 4b displayed on the display section 4a to a predetermined position, and a displayed empirical rule (IF-T
A fuzzy rule setting key part 5b includes data keys for changing variables in the condition part and conclusion part of the HEN rule), and an update instruction key 5c for rewriting the contents of the fuzzy rule storage part 2 with the changed empirical rules. is provided.

Next, to explain the operation of the fuzzy control device having the above configuration, it is assumed that an instruction to display the empirical rules of the fuzzy controller 3 is issued by the fuzzy rule rewriting device (for example, the power is turned on). ). Further, as shown in FIG. 2, if the fuzzy controller 3 has two inputs, one output, and 25 empirical rules, the display section 4a displays 25 empirical results. The condition part and conclusion part of the rule are displayed, and the cursor 4b is also displayed.

When changing the empirical rule, one of the cursor key sections 5a is operated to move the cursor 4b to the display data of the condition section or conclusion section to be changed. Next, change the data to be changed (PB, PS, ZR, NS
, NB) by selecting and operating any of the fuzzy rule setting keys 5b, the condition part or conclusion part indicated by the cursor 4b is rewritten. For example, in the table shown in Figure 2, input 1 is PB and input 2 is P.
B, and when changing the PS in the conclusion part to PB, move the cursor 4b to the displayed position of that PS and operate the rPBJ key in the fuzzy rule setting key part 5b. In this way, after changing the empirical rule of the fuzzy controller 3 to a predetermined value, the update instruction key 5c of the fuzzy rule rewriting unit 5 is
When is operated, the empirical rule data displayed on the display 4a is written into the fuzzy rule storage section 2.

In this way, the contents of the fuzzy rule storage unit 2 can be easily rewritten to any empirical rule, so the fuzzy controller 3 can be used for fuzzy control of various different control targets, and one fuzzy control device can It can be used for any type of equipment, and especially when creating fuzzy control rules of thumb, the rules of thumb can be changed freely.

While rewriting the empirical rule, it is possible to create an optimal empirical rule for the controlled object, and moreover, it is possible to improve the efficiency of creating the empirical rule.

In the above embodiment, a fuzzy controller with two inputs, one output, and 25 empirical rules was explained, but it is not possible to use a fuzzy controller with many input high-power terminals. is also applicable.

[Effects of the Invention] As explained above, the fuzzy control device of the present invention includes a rewritable fuzzy rule storage unit that stores fuzzy rules, and displays the fuzzy rules stored in this fuzzy rule storage device. A display device for changing the fuzzy rules displayed on the display device and a fuzzy rule rewriting device for rewriting the fuzzy rules in the fuzzy rule storage device with the changed fuzzy rules are provided. Since the control rule of thumb can be changed arbitrarily, it is possible to perform fuzzy control of various devices with different control targets using one fuzzy control device, and it is also possible to improve the creation efficiency when creating the rule of thumb. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a fuzzy control device showing an embodiment of the present invention, FIG. 2 is a display state diagram of a fuzzy rule display device of the fuzzy control device, and FIG. 3 is a fuzzy rule display diagram of the fuzzy control device. A schematic front view of the rewriting device, and FIG. 4 is a schematic block diagram of a conventional fuzzy control device. In the figure, 2 is a fuzzy rule storage unit, 3 is a fuzzy controller, 4 is a fuzzy rule display device, 4a is a display unit,
4b is a cursor, 5 is a fuzzy rule rewriting device, 5a is a part of the cursor key, 5b is a part of the fuzzy rule setting key, 5
c is an update instruction key. Patent applicant: Fujitsu General Co., Ltd. Agent: Patent attorney: Takuya Ohara

Claims (1)

[Claims] (1) In a fuzzy control device that stores fuzzy rules, performs logical operations such as MIN calculations and center of gravity calculations on input values according to the rules, and performs fuzzy control of equipment based on the results of the operations. a rewritable fuzzy rule storage means for storing, a display means for displaying the fuzzy rules stored in the fuzzy rule storage means, and a display means for changing the fuzzy rules displayed on the display means;
A fuzzy control device further comprising a fuzzy rule rewriting means for rewriting the fuzzy rule in the fuzzy rule storage means with the changed fuzzy rule, so that the fuzzy rule for the fuzzy control can be changed.