JPH0512021A - Fuzzy inference device - Google Patents

Abstract

PURPOSE:To reflect the changing state on the inference result and to accurately perform the control by inferring a target speed by using the preceding target value as an input variable and outputting this target speed together with the target value inferred by a target value inference means. CONSTITUTION:This device consists of the target value inference means which infers the target value based on the input variable and a target speed inference means which infers the target speed based on the present target value. That is, the target value as the inference result of the target value inference means is inputted to the target speed inference means together with the preceding target value, and the target speed inference means executes the fuzzy inference to infer the target speed based on the preceding target value and the present target value. This target speed is outputted together with the target value inferred by the target value inference means, and this inference result includes the degree of urgency based on the changing state. Thus, the changing state of the inference result of the target value due to fuzzy inference is taken into consideration and is outputted as the target speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuzzy inference apparatus for executing fuzzy inference for inferring a target value for a same object a plurality of times, and in particular, fuzzy inference of urgency from a previous inference result and a current inference result. Regarding the reasoning device.

[0002]

2. Description of the Related Art A conventional fuzzy inference apparatus executes fuzzy inference according to a predetermined fuzzy rule and membership function, using a detection result of the state of a controlled object as an input variable. This inference result is output as the target value of control for the controlled object. Further, in general, fuzzy inference in a fuzzy controller is executed a plurality of times continuously or intermittently for the same object, but in a conventional fuzzy inference device, inference results in each fuzzy inference are independent, They do not affect each other.

[0003]

However, in the conventional fuzzy inference apparatus, as shown in FIG. 4A, the first target value is PS (slightly more) and the second target value is PM (slightly more). If the third time is PL (quite large number), only PL, which is the latest inference result, is output. Further, as shown in FIG. 6B, the second inference result is PS (slightly large), and even when the third time suddenly becomes PL (pretty large), it is the same as the case in FIG. Since only the target value of PL is output as the inference result, the transition of the inference result is not considered. Therefore, in the example shown in FIGS. 4A and 4B,
Although the pattern shown in FIG. 7B has a higher urgency, the urgency due to a change in the inference result is not expressed as an inference result, and quick control cannot be performed.

An object of the present invention is to output a target value and a target speed as an inference result of fuzzy inference so that an urgent degree due to a change in the target value can be expressed as an output, and a quick and accurate control of a controlled object can be performed. It is to provide a fuzzy reasoning device that can perform.

[0005]

As shown in FIG. 1, a fuzzy inference apparatus of the present invention has a target value inference means for inferring a target value based on an input variable, and a previous result which is an inference result of this target value inference means. The target speed inference means for inferring the target speed on the basis of the target value and the target value of this time.

[0006]

In the present invention, the target value which is the inference result of the target value inference means is input to the target speed inference means together with the previous target value, and the target speed inference means is based on the previous target value and the current target value. Fuzzy inference to infer target speed is executed. This target speed is output together with the target value which is the inference result of the target value inference means. Therefore, the inference result of the fuzzy inference apparatus includes the degree of urgency based on the changed state of the inference result.

[0007]

FIG. 2 is a block diagram showing the configuration of a fuzzy reasoning apparatus according to an embodiment of the present invention. R for CPU1
The OM2, RAM3 and interfaces 4 and 5 are connected. The ROM 2 stores a processing procedure and fuzzy rules in the fuzzy inference of the CPU 1. C
PU1 follows interface 4 according to this fuzzy rule.
The fuzzy inference based on the data x1 to xn input from is executed. The CPU 1 temporarily stores the inference result in the fuzzy inference process in the memory area MA1 of the RAM 3.
Further, this inference result is output to a control device (not shown) via the interface 5.

FIG. 3 is a flowchart showing the processing procedure of the fuzzy inference apparatus. After the power is turned on, the CPU 1 waits for a predetermined inference timing (n1), and reads the input data x1 to xn at a predetermined timing (n
2). The CPU 1 executes fuzzy inference for inferring a target value by using the input data x1 to xn as input variables (n
3). Thereafter, the previous target value stored in the memory area MA1 of the RAM 3 is read (n4), and fuzzy inference for inferring the target speed is executed from the read previous target value and this read target value (n5). The target value and target speed thus obtained are output as an inference result of fuzzy inference (n6). Next, the current target value is stored in the memory area MA1 of the RAM 3, and the previous target value is updated (n7). The processes of n1 to n7 are continuously performed until the inference end command is input (n8).

As described above, according to this embodiment, the change in the inference result is output as the target speed together with the target value,
The change state of the inference result can be reflected in the inference result. Such a fuzzy reasoning device is, for example, a system that assists in determining the timing of closing (price cut) of fresh food in a store, and it is necessary to close the current time, the remaining amount of goods, the sales tendency and the freshness as input variables. When inferring sex, when the need to close off changes from "none" to "large", it outputs a message that the urgency is high, and the support system receives this message, such as "please reduce the price soon". Can be shown on the display,
It is possible to accurately indicate the timing of price reduction.

[0010]

According to the present invention, it is possible to consider the change state of the inference result of the target value by fuzzy inference, and output this as the target speed, and to quickly and accurately respond to the change of the state of the controlled object. There is an advantage that control can be performed.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of the present invention.

FIG. 2 is a block diagram showing a configuration of a fuzzy inference apparatus that is an embodiment of the present invention.

FIG. 3 is a flowchart showing a processing procedure of the fuzzy inference apparatus.

FIG. 4 is a diagram showing an output state of an inference result in conventional fuzzy inference.

[Explanation of symbols]

 1-CPU 3-RAM

Claims (1)

Claim: What is claimed is: 1. A fuzzy inference apparatus for executing fuzzy inference by a target value inference means a plurality of times with respect to the same target, fuzzy inference of urgency from a previous target value and a current target value A fuzzy reasoning device characterized by being provided with a target speed inference means for outputting the speed together with the target value of this time.