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Method for controlling output of belt weigher system

A control method and technology of belt scale, applied in the direction of adaptive control, general control system, control/adjustment system, etc., can solve the problems of overshoot and large response of control effect, inability to respond in time, control lag, etc., to solve the problem of overshoot and Response time contradiction, small fluctuation, small effect overshoot

Active Publication Date: 2011-01-12
珠海市长陆工业自动控制系统股份有限公司
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AI Technical Summary

Problems solved by technology

PID control is a pure hysteresis control, and its control itself has serious hysteresis and cannot respond to the current situation in time, so the control effect is often large overshoot or slow response

Method used

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  • Method for controlling output of belt weigher system

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Experimental program
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Embodiment Construction

[0013] First of all, the non-linearity of the belt scale control system is mainly concentrated in two parts: 1) the characteristics of the analog control output AO of the instrument cannot be completely linear; 2) the output of the frequency converter and the motor are not linear.

[0014] Suppose the control model is

[0015] y=f(x1,x2)(1)

[0016] y is the output of the belt scale system, x1 is the analog control output of the instrument, and x2 is the output of the inverter and the motor. Because of the nonlinearity of x1 and x2, the intersection of these two nonlinearities makes it difficult to establish the control model f(x1, x2) function.

[0017] In view of the above two problems, the linear adjustment in this scheme is divided into two parts, namely:

[0018] 1. Make linear compensation adjustment to the characteristic x1 of the analog control output AO of the instrument, so that it has an ideal linear output.

[0019] 2. Make a linear compensation adjustment to th...

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PUM

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Abstract

The invention discloses a quick precise stable-control method for controlling output of a belt weigher system. The method is realized in a way that: when a target flow error range is smaller than a threshold, controlling by using a PID model; and when the target flow error range is greater than the threshold, adjusting to a linear model to find out the optimal control output point, and limiting the upper and lower limits of the control output. After the control method is used in a belt weigher instrument, when a user uses the belt weigher control instrument with on-line linear adjustment function, only one target value needs to be provided; and if the target value is within the reasonable range, the model can quickly find out the optimal control value. The invention solves the contradiction between overshooting and response time, and thus, the invention has the advantages of small overshooting of control effect, small fluctuations and quick reaction.

Description

technical field [0001] The invention relates to the field of metering control, in particular to a method for controlling the output of a belt scale system. Background technique [0002] In the control of the traditional belt scale instrument, the control object of the belt scale is completely regarded as a black box with unknown characteristics. Moreover, because the characteristics of the analog (4-20mA) control output AO of the instrument cannot be completely linear, the output and input of the inverter and the motor are not linear. These nonlinearities make it impossible for developers to use excellent control algorithms to control belt scales, and the control results cannot be simply predicted. Usually, only the most basic tentative control algorithms can be used, that is, first control the output of a value, and then according to the size of the feedback value Then adjust the output until the control purpose is achieved. This will inevitably produce contradictions in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 何晓东杨永济
Owner 珠海市长陆工业自动控制系统股份有限公司
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