JPH0444014U

JPH0444014U -

Info

Publication number: JPH0444014U
Application number: JP8710790U
Authority: JP
Priority date: 1990-08-21
Filing date: 1990-08-21
Publication date: 1992-04-14

Description

[Brief explanation of the drawing]

第１図は本考案に係る流量制御システムの一実
施例を示すシステム構成図、第２図はメモリ内に
格納された流量と操作信号の特性曲線を示す図、
第３図、第４図はフイードバツク制御のみで制御
を行つた際の測定値の変化を示す図、第５図は予
測制御で良好な追従が行われた場合を示す図、第
６図は予測制御で良好な追従が行われない場合を
示す図である。１……流量計、２……調節弁、３……調節計、
４……演算回路、４１……メモリ、４２……操作
信号算出手段、５……設定手段、ＳＷ……切換え
スイツチ。 FIG. 1 is a system configuration diagram showing an embodiment of a flow rate control system according to the present invention, FIG. 2 is a diagram showing characteristic curves of flow rate and operation signal stored in memory,
Figures 3 and 4 are diagrams showing changes in measured values when control is performed using only feedback control, Figure 5 is a diagram showing a case where good tracking is performed with predictive control, and Figure 6 is a diagram showing predictions. It is a figure which shows the case where good tracking is not performed by control. 1...Flowmeter, 2...Control valve, 3...Controller,
4... Arithmetic circuit, 41... Memory, 42... Operation signal calculation means, 5... Setting means, SW... Changeover switch.

Claims

[Claim for Utility Model Registration] A closed loop that performs feedback control, consisting of a flowmeter that measures the flow rate, a control valve that adjusts the measured flow rate, and a controller that controls the control valve to match the flow rate setting value. In the flow control system, the flow rate is optimally controlled by switching between the open-loop side and the open-loop side, in which the valve opening is predictively controlled by the arithmetic circuit based on the step-shaped flow rate set value, using a changeover switch. A memory that stores multiple types of characteristic curves of the flow rate and valve opening according to the differential pressure in the flow path before and after the control valve, which is determined by the flow rate flowing into the control valve and the valve opening, with the differential pressure as a parameter, and the flow rate setting before change. The characteristic curve in the memory is selected from the value and the operation signal for the pre-change flow rate set value from the controller, and the changed flow rate set value and this curve are used to perform an operation corresponding to the changed flow rate set value. A flow control system comprising: operation signal calculation means for calculating a signal and providing the operation signal to the control valve.