CN104614983A

CN104614983A - Automatic control method of large pure hysteresis loop

Info

Publication number: CN104614983A
Application number: CN201410797620.2A
Authority: CN
Inventors: 柳艳峰; 王锐; 张天红; 张忠; 吉春山; 赵金; 张鸿雁; 苏玉娟; 汪金华
Original assignee: Jinchuan Group Co Ltd
Current assignee: Jinchuan Group Co Ltd
Priority date: 2014-12-22
Filing date: 2014-12-22
Publication date: 2015-05-13

Abstract

The invention discloses an automatic control method of large pure hysteresis loop; the control method sets a measured value data collection cycle as equal to or less than 10ms for continuously collecting measured data, doing an average calculation for equal to or more than 100 pieces of continuously collected measured data, and using the average value as a final measured value which is sent to a control loop for being used as the measured value of the loop; in the control loop, the loop pure hysteresis time obtained by measurement is Alpha, the inertia hysteresis time is Beta, the control cycle is T=Alpha+Beta, the number of the control cycle is n, the loop actual measured input value is x, the processed loop measured input value is x', Deltax is the input variable, y is the loop output value, Delta y is the output variable; a normal PID loop is arranged in this loop, the P,I and D parameters of the PID loop are configured based on the loop inertia hysteresis tome; and in each control cycle, the output of the PID loop is only persist available within a certain period at two time points NT+Alpha and NT+1/2Beta. The method is able to achieve that the controlled amount of the large pure hysteresis loop is finally stabilized within +-1.5%.

Description

A kind of autocontrol method of large time delay loop

Technical field

The invention belongs to automatic control technology field, particularly relate to a kind of autocontrol method of large time delay loop.

Background technology

In large time delay automatic control loop, owing to there is the delayed of long period between measured value and circuit controls value, regulatory PID control often causes controlling to export not mating with measured value, and step imbalance, loop are seriously vibrated, cannot realize the automatic phenomenon controlled.

Summary of the invention

The object of the invention is for prior art Problems existing, a kind of autocontrol method of large time delay loop is provided.

Above-mentioned purpose is realized by following proposal:

A kind of autocontrol method of large time delay loop, it is characterized in that, measured value data collection cycle is set to≤10ms by described control method, continuous acquisition measurement data, >=100 continuous acquisition measurement data do a mean value calculation, and this mean value is delivered to the measured value of control loop as this loop as final measured value; In control loop, it is α that measurement obtains loop pure delay time, the inertia lag time is β, control cycle T=alpha+beta, n is control cycle number of times, and x is loop actual measurement input value, x ' is for measuring input value in the loop after process, △ x is input changing value, and y is loop output valve, and △ y is exporting change value; Traditional PID loop is set in control loop, pid loop P, I, D parameter presses control loop inertia lag set of time, and pid loop exports in each control cycle, only in output continuous and effective in certain hour section of two time point nT+ α, nT+1/2 β.

According to above-mentioned autocontrol method, it is characterized in that, measured value data collection cycle is 10ms, and 100 continuous acquisition measurement data do an average computation.

Beneficial effect of the present invention: method of the present invention processes the serious measured value of fluctuation, except routine filtering, increase except the method such as damping time, take to reduce and adopt one number time, increase and adopt several frequency, regularly take the method for mean value, eliminate the data fluctuations because measuring equipment causes.In addition, measure pure delay time and the inertia lag time in large time delay loop, take the method simulating the output of manual shift mode+PID traditional regulation, achieve the automatic control in large time delay loop.

Accompanying drawing explanation

Fig. 1 is control drawing of the present invention;

Fig. 2 is control output timing of the present invention.

Embodiment

Measured value data collection cycle being set to 10ms or less, continuous acquisition measurement data, every 100(or more) individual data do a mean value calculation, and this mean value are delivered to the measured value of control loop as this loop as final measured value.

See Fig. 1 and Fig. 2, in control loop, if the loop pure delay time recorded is α, the inertia lag time is β, control cycle T=alpha+beta, n is control cycle number of times, x is loop actual measurement input value, and x ' is that input value is measured in the loop after process, and △ x is input changing value, y is loop output valve, and △ y is exporting change value.Traditional PID loop (loop P is set in this loop, I, D parameter is by loop inertia lag set of time), but pid loop exports in each control cycle, only at two time point nT+ α, in certain hour section, (this time span is according to operative employee's operating feature and control loop pure delay time in the output of nT+1/2 β, inertia time is determined) continuous and effective, that is, according to large time delay loop feature, each control cycle time span is alpha+beta, in each control cycle, controller only exports two values, the value that first output valve exports when being upper periodic quantity α+0.5 β, this output is continued until this cycle nT+ α time point from a upper cycle (n-1) T+ α+0.5 β time point, second output valve duration is nT+ α to nT+ α+0.5 β.

Claims

1. the autocontrol method in a large time delay loop, it is characterized in that, measured value data collection cycle is set to≤10ms by described control method, continuous acquisition measurement data, >=100 continuous acquisition measurement data do a mean value calculation, and this mean value is delivered to the measured value of control loop as this loop as final measured value; In control loop, it is α that measurement obtains loop pure delay time, the inertia lag time is β, control cycle T=alpha+beta, n is control cycle number of times, and x is loop actual measurement input value, x ' is for measuring input value in the loop after process, △ x is input changing value, and y is loop output valve, and △ y is exporting change value; Traditional PID loop is set in control loop, pid loop P, I, D parameter presses control loop inertia lag set of time, and pid loop exports in each control cycle, only in output continuous and effective in certain hour section of two time point nT+ α, nT+1/2 β.

2. autocontrol method according to claim 1, is characterized in that, measured value data collection cycle is 10ms, and 100 continuous acquisition measurement data do an average computation.