JPH04354024A - Antecedent part fuzzy control processor - Google Patents

Abstract

PURPOSE:To reduce a circuit scale, to attain the high speed of the operation speed of the arithmetic operation of an antecedent part, and to allow the arithmetic operation of a consequent part to have the degree of freedom. CONSTITUTION:This device is equipped with a register 12 which holds numerical data from a system bus SB, counter 13 which counts the numerical data from the system bus SB as an initial value, antecedent part membership function generating circuit 14 which generates an antecedent part membership function by using the held value of the register 12 as an input variable, and antecedent part arithmetic circuit 15 which executes the arithmetic processing of the antecedent part by the obtained antecedent part membership function. And also, the above mentioned equipments, and a consequent part membership function generating circuit 16 which generates a consequent part membership function by using the counted value of the counter 13 as the input variable, are turned into one chip, the arithmetic result obtained by the antecedent part arithmetic circuit 15 and the consequent part membership function obtained by the consequent part membership function generating circuit 16 are supplied to a consequent part arithmetic processing part 20 realized by a software at the outside of the chip, and the final fuzzy inferred result is obtained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antecedent fuzzy control processor used in fuzzy inference.

0002

[Prior Art] When an arbitrary system is controlled by a fuzzy inference device using fuzzy theory, the fuzzy inference device can be controlled by dedicated hardware, since few general-purpose LSIs for fuzzy inference have been developed. Instead, it was often achieved through software. However, with this software-based fuzzy inference device, the calculation speed is 100% dependent on the processing power of the CPU used, and if the amount of data processed is increased to improve inference accuracy, the calculation speed will decrease. I had a problem. On the other hand, in recent years, various LSI chips for fuzzy inference have been developed, and as a result, the proportion of hardware in fuzzy inference tends to increase.

0003

[Problems to be Solved by the Invention] Now that various LSI chips for fuzzy inference have been developed as mentioned above, it is necessary to develop a circuit that generates membership functions of the antecedent part and the consequent part and the generated antecedent part. If the arithmetic processing circuit that performs the arithmetic processing using the membership functions of the Therefore, only a limited number of processing methods can be executed, reducing the degree of freedom. In particular, regarding the arithmetic processing circuit for the consequent membership function, the height method, area method, centroid method, and other arithmetic methods have characteristics such as those that emphasize the calculation speed of fuzzy inference and those that emphasize accuracy. Since the required calculation method differs depending on the object to be controlled, if it is implemented as hardware together with other circuits, the application of the device will be limited.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to reduce the circuit scale by converting the portion of the fuzzy inference device other than the consequent part arithmetic processing circuit into hardware. Another object of the present invention is to provide an antecedent part fuzzy control processor that can increase the calculation speed of the antecedent part while providing a degree of freedom in the consequent part calculation.

[0005]

[Means and operations for solving the problems] That is, the present invention provides a register connected to a system bus and holding numerical data given from the system bus, and a register connected to the system bus and holding numerical data given from the system bus. A counter that performs counting using data as an initial value, an antecedent membership function generation circuit that generates an antecedent membership function using the value held in the register as an input variable, and a an antecedent part arithmetic circuit that performs antecedent part arithmetic processing using the antecedent part membership function determined by the antecedent part membership function, and a consequent part membership function generation circuit that generates a consequent part membership function using the count value of the counter as an input variable. are integrated into one chip, and the consequent part arithmetic processing unit realizes the arithmetic results obtained by the antecedent part arithmetic circuit and the consequent part membership functions obtained by the consequent part membership function generation circuit using software outside the chip. This system is designed to reduce the circuit scale and speed up the calculation of the antecedent part, while increasing the degree of freedom in the calculation of the consequent part. You can have it.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the circuit configuration thereof, and numeral 11 is a one-chip antecedent part arithmetic processor, and the antecedent part arithmetic processor 11 includes a register 12 and a counter connected to a system bus SB. 13, an antecedent membership function generation circuit 14, an antecedent calculation circuit 15, and a consequent membership function generation circuit 16 are constructed.

The register 12 holds the numerical data sent via the system bus SB, and outputs the held value to the antecedent membership function generation circuit 14 as an input variable for the antecedent. Antecedent membership function generation circuit 14
generates an antecedent membership function according to the given input variables and outputs it to the antecedent calculation circuit 15. The antecedent part calculation circuit 15 performs an antecedent part calculation to obtain the degree value of the antecedent part membership function generated by the antecedent part membership function generation circuit 14, and sends the obtained calculation result to the antecedent part calculation processing processor. 11 is output to the external consequent calculation processing unit 20.

The counter 13 sets the numerical data from the system bus SB as an initial count value, and thereafter counts up using an external clock pulse.The count value is determined by the generation of the consequent membership function. It is output to the circuit 16. The consequent part membership function generation circuit 16 continuously generates the consequent part membership function according to the count value of the counter 13, and sends the consequent part membership function to the consequent part calculation processing section 20 outside the antecedent part calculation processing processor 11. Output directly.

[0010] The consequent part arithmetic processing unit 20 calculates the membership value and the consequent part membership function which are the arithmetic results of the antecedent part sent from the antecedent part arithmetic circuit 15 in the antecedent part arithmetic processor 11. A consequent part calculation process is executed using an arbitrary calculation method based on the consequent part membership function sent from the generation circuit 16, and the obtained calculation result is output to a controlled object (not shown).

In the above configuration, when an input variable is given to the register 12 and the counter 13 via the system bus SB, the register 12 holds the input variable and generates the antecedent membership function generation circuit 14. Output to. The antecedent membership function generation circuit 14 generates a membership function corresponding to the input constant using a plurality of preset coordinate data and outputs it to the antecedent calculation circuit 15. The antecedent part calculation circuit 15 uses the antecedent membership function from the antecedent membership function generation circuit 14 to calculate a degree value in the range of 0 to 1 that satisfies the antecedent part of the fuzzy rule. The calculation is performed and the obtained calculation result is output to the consequent calculation processing unit 20 outside the antecedent calculation processing processor 11.

On the other hand, the counter 13 reads the numerical data from the system bus SB and uses it as an initial count value, and then sequentially counts up in response to an external clock pulse. Output to circuit 16. The consequent part membership function generation circuit 16 generates a continuous consequent part membership function according to the count value of the counter 13 using a plurality of preset coordinate data, and generates a continuous consequent part membership function according to the count value of the counter 13. It is directly output to the consequent part arithmetic processing section 20 of.

The consequent part arithmetic processing section 20 is a software implementation of a consequent part arithmetic method according to the needs of the controlled object, such as the "height method" which is high in calculation speed, and is an antecedent part arithmetic processing processor. From the degree value which is the calculation result of the antecedent part sent from the antecedent part calculation circuit 15 in 11 and the continuous consequent part membership function sent from the consequent part membership function generation circuit 16. The software executes the consequent calculation process and outputs the obtained calculation result to the controlled object.

[0014]

As described above, according to the present invention, a register is connected to a system bus and holds numerical data given from the system bus, and a register is connected to the system bus and holds numerical data given from the system bus. A counter that performs counting using data as an initial value, an antecedent membership function generation circuit that generates an antecedent membership function using the value held in the register as an input variable, and an antecedent membership function generation circuit that generates an antecedent membership function. an antecedent part arithmetic circuit that performs antecedent part arithmetic processing using the antecedent part membership function determined by the antecedent part membership function, and a consequent part membership function generation circuit that generates a consequent part membership function using the count value of the counter as an input variable. A consequent part arithmetic processing section is implemented by implementing software outside the chip, and the result obtained by the antecedent part arithmetic circuit and the consequent part membership function obtained by the consequent part membership function generation circuit are integrated into one chip. Since the final fuzzy inference result is obtained by supplying the
It is possible to provide an antecedent part fuzzy control processor that can increase the calculation speed with respect to the calculation of the antecedent part while providing a degree of freedom in the calculation of the consequent part.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a circuit configuration according to an embodiment of the present invention.

[Explanation of symbols]

11...Antecedent part arithmetic processing processor, 12...Register, 1
3...Counter, 14...Antecedent part membership function generation circuit, 15...Antecedent part arithmetic circuit, 16...Consequent part membership function generation circuit, 20...Consequent part arithmetic processing unit, SB...System bus.

Claims (1)

[Claims] 1. Holding means connected to a system bus and holding numerical data given from the system bus; and counting means connected to the system bus performing counting using the numerical data given from the system bus as an initial value. and an antecedent part membership function generating means for generating an antecedent part membership function using the held value of the holding means as an input variable, and an antecedent part membership function obtained by this antecedent part membership function generating means. An antecedent part calculation means for performing an antecedent part calculation process according to the method described above, and a consequent part membership function generation means for generating a consequent part membership function using the count value of the counting means as an input variable are integrated into the same integrated circuit. An antecedent part fuzzy control processor characterized by comprising: