JPS6027903A - Control device - Google Patents

Abstract

PURPOSE:To obtain a hybrid controller which makes the best use of both an analog and a digital operation by employing the analog operation for a control operation and the digital operation for parameter setting. CONSTITUTION:An analog arithmetic circuit A consists of an input circuit 1 which compares an input signal ei with a set signal es to generate a deviation signal, a control circuit 2 which performs a PID operation, etc., according to the output of the circuit 1, and an output circuit 3 which generates an operation output eo according to the output of the circuit 2. A digital arithmetic circuit 5 inputs information from the circuits 1, 2, and 3 through an A/D converter 42 and also inputs information from an external setter 6, and decides on and control various parameters of the circuit A through a D/A converter 42. Thus, the control operation is carried out on analog basis and the parameter setting is performed on digital basis to obtain a high-speed response and set optional parameters easily.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of the Invention The present invention relates to a regulating device for regulating and controlling process variables such as temperature and pressure.

(2) Prior art In recent years, digital controllers using microcomputers have been proposed, but because they are sampling controls that take in signals at regular intervals, perform adjustment calculations, and output the results,
The drawback is that high-speed response is difficult, and stable control is difficult depending on the application.

The aim is to provide a hybrid adjustment device that takes advantage of the advantages of both types of logs.

(Embodiment 4 of the Invention FIG. 1 is an explanatory diagram of the configuration of an embodiment of the invention.

In the figure, ``■'' is an input circuit that compares the input signal ei with the setting signal e- and generates a deviation signal, and 2 is an adjustment circuit that performs PID calculation etc. in accordance with the output of the input circuit board.

3 is an output circuit that generates an operation output eo according to the output of the adjustment circuit 2, and these input circuits 1. The adjustment circuit 2゜output circuit 3 includes analog elements such as operational amplifiers and constitutes an analog calculation circuit A.

gain of input circuit 1, scale constant, PII of adjustment circuit 2)
Various parameters such as constants, output circuit 30 output, etc. are A-
D converter 41. L)-A via converter 42.

Each input circuit 1. The adjustment circuit 2 and the output circuit 3 perform predetermined calculations to perform optimal control.

In other words, the digital arithmetic circuit 5 includes the input circuit 1, the adjustment circuit 2. In addition to inputting information from the output circuit 3 manually via the A-D converter 41, it is also input from an external setting device 6, and is used to control various parameters of the analog calculation circuit A via the IJ-A converter 42. I do. A-D converter 41.1 in this case
)-A converter 42 only needs to convert the required signal region, so it requires fewer bits and is inexpensive. Note that the manual setting voltage Vs may be used as the setting signal es by switching the switch S. FIG. 2 shows an example of the connection between the input circuit 1 and the digital arithmetic circuit 5. The deviation output of the input circuit 1 is converted into a digital signal and displayed as a set value on the display 61 and input to the digital arithmetic circuit 5. The value is inputted, added to the setting signal by the adder 62, and displayed as an input value by the display 61'. Note that the input circuit 1 is 1 in the case of differential-preceding PID control.
), and then calculate the deviation, and various other modifications are possible.

FIG. 3 shows an example of the connection between the adjustment circuit 2 and the digital arithmetic circuit, with an FET and a resistor R2 in the input circuit of the operational amplifier UP.
The adjustment circuit 2, which is configured as an integrating circuit by connecting a capacitor C to the feedback circuit, controls the on-resistance of the FET and changes the integration time etc. from the digital arithmetic circuit 5 via the L)-A converter 42. It has become.

In this way, adjustment calculations, etc. are all analog, so high-speed response is possible, and parameter settings are digital, so they can be set arbitrarily.
High precision settings are possible.

(5) Summary of the Invention As described above, the present invention provides an analog calculation circuit that performs adjustment calculations based on input signals and setting signals and generates output signals, and a digital calculation circuit that determines various pan meters of this analog calculation circuit. A regulating device comprising a circuit.

(6) Effect of invention Adjustment calculations are always performed using analog calculations.

It has high temporal and quantitative resolution, low wasted time, fast response, and enables highly accurate and stable control.

In addition, parameter settings are performed using digital calculations, making complex calculations involving multiple variables easy.

Appropriate and arbitrary parameter settings can be made.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, and FIG. 3 are configuration explanatory diagrams showing one embodiment of the present invention. l...input circuit, 2...adjustment circuit, 3...output circuit. 5...Digital arithmetic circuit, A...Analog arithmetic circuit Patent applicant Chino Seisakusho Co., Ltd.

Claims (1)

[Claims] 1. An analog calculation circuit that performs adjustment calculations based on input signals and setting signals and generates output signals, and (a) a digital calculation circuit that determines various parameters of the FNA log calculation circuit. An adjustment device characterized by comprising: