CN1614528A - Automatic and dynamically compensating method for proportioning materials - Google Patents

Abstract

An automatic-dynamic compensating method includes setting initial set value SP0 for the first batching and initial compensation value, calculating out error between the first batching set value SP0 and the first weighing value PV1, indexing out compensation coefficient K according to the error value, using SP1=K(PV1-SP0) as set value of the second charge of material, repeating above step and confirming that set value of N+1 charge of material is Spn+1=SP0-K(PVn-SP0).

Description

A kind of automatic and dynamically compensating method for proportioning materials

Technical field

The present invention relates to a kind of can be really accurately material proportion to procedure parameter change significantly and the interference of load has the automatic and dynamically compensating method for proportioning materials of very strong adaptive ability.

Background technology

Accurate control for limekiln batching coal rate realizes by accurate control coal stone amount, and the reinforced process of coal stone is to finish by the start-stop of control motor.For whole reinforced control procedure, feeding quantity is rambunctious in critical point, because: (1) system is the special system of analog quantity input discrete magnitude output.There is bigger pure hysteresis, i.e. buckles; (2) this analog quantity (controlled parameter) has high sensitivity near the reference mark, and the unit interval feeding quantity is vulnerable to the influence of instantaneous granule size, motor situation and the other factors of material; (3) set up one accurately process mathematical model suitable difficulty is arranged.Obviously, traditional PID control is difficult to handle this change step response problem.

Summary of the invention

The object of the present invention is to provide a kind of batching automatic compensating method that can accurately control material proportion.

In order to achieve the above object, the invention provides a kind of automatic and dynamically compensating method for proportioning materials, this method may further comprise the steps:

(1) sets the initial set-point SP for preparing burden for the first time ₀, and set the initial compensation value;

(2) calculate the initial set-point SP for preparing burden the first time of setting ₀And the first time of material actual error of weighing between the PV1;

(3) utilize rule set to retrieve the corresponding compensation COEFFICIENT K according to error amount;

(4) make SP1=K (PV1-SP ₀) be reinforced for the second time set-point; And

(5) repeat above-mentioned steps 1-4, the set-point when carrying out feeding in raw material for the N+1 time is SPn+1=SP successively ₀-K (PVn-SP ₀).

The inventive method adopts to open and close the method that ring combines from the basic thought of Based Intelligent Control (IC), and expert system technology, has designed a kind of conventional new type of control method that is different from.This intelligence control method has the very strong adaptive ability and the higher index of quality, thereby can guarantee the accurate control of proportioning materials.

Description of drawings

Fig. 1 is the implementation method process flow diagram of a kind of automatic and dynamically compensating method for proportioning materials provided by the present invention;

Fig. 2 is the specific embodiment of the present invention process flow diagram;

Fig. 3 represents with EC to be control core system basic structure.

Embodiment

Be the process flow diagram of the implementation method of a kind of proportioning materials automatic compensating method provided by the present invention as shown in Figure 1, at first, set the initial set-point SP for preparing burden for the first time ₀, and set initial compensation value, step 101; Calculate the initial set-point SP for preparing burden the first time of setting ₀And the first time of material actual error of weighing between the PV1, step 102; Utilize rule set to retrieve corresponding compensation COEFFICIENT K, step 103 according to error amount; Make SP1=K (PV1-SP ₀) be reinforced for the second time set-point, step 104; Repeat above-mentioned steps 101-104, the set-point when carrying out feeding in raw material for the N+1 time is SPn+1=SP successively ₀-K (PVn-SP ₀).

Lift a specific embodiment below, technical scheme of the present invention is described.

In the present embodiment, at first object is analyzed: the limekiln burning process requires the coal stone in every jar of charging to mix by a certain percentage, and promptly the interior coal stone of kiln is in this ratio combustion reaction.Because the burning in limekiln is a continuous process and has long time constant that so, we can regard whole process as the process of continous batching, continuous burning and continuous ash discharge.So, the index of desired each jar coal of technology rate just can be equivalent to the average coal rate of continuous several jars or tens jars.Also be appreciated that, be unlikely to influence in the time period of burning at one, the coal stone average specific of continuous feed equals single jar of coal stone ratio of technological requirement.

According to above analysis, pursue single jar of coal rate accurately, both unrealistic also need not, in serialization is produced, be impossible, the metering that coal stone is arranged again is production requirement but not requirement for sale.Therefore, we get 20 jars is an interval or time period, if can control the average coal rate of this coal stone batch mixing of 20 jars, just can satisfy the requirement of production fully.

As shown in Figure 2, the specific embodiments of the invention step is as follows:

Setting initial set-point is technology set-point SPo, and the initial compensation amount is 5 percent of SPo, step 201; Drive charger, step 202; Judge whether weight reaches set-point Spo, step 203; As be weighed to the continuation of set-point program, otherwise EOP (end of program); Stop reading weight PV1, step 204 after charger left standstill for 5 seconds; Obtain error (PV1-SPo), in rule set, retrieve corresponding K value, step 205; Make SP1=K (PV1-SPo) as reinforced for the second time set-point, step 206; Counter adds 1, step 207; Connect other function program, step 208; EOP (end of program), step 209.With SP1 as initial set-point, repeating step 201-209, the set-point when carrying out feeding in raw material for the N+1 time is SPn+1=SPo-K (PVn-SPo) successively.

Being illustrated in figure 3 as the present invention is control core system basic structure with EC.

The basic thought of intelligent controller is exactly to open and close the intelligent control algorithm that ring combines in the foregoing description, and the essential characteristic of this algorithm is to open and close ring to combine.Formula is as follows:

SPn+1=SPo-K (PVn-SPo), charger=ON

Charger=OFF, PVn 〉=SPo

SPo: technique initialization value; The initial zero output value of controller;

SPn+1: the actual value of feeding in raw material that stops of n+1 jar; The n+1 time output valve of controller;

PVn: the actual weight value of coal stone; The input value of the controller after handling after testing;

K: penalty coefficient or controlling elements;

ON: the coal stone charger starts ON;

OFF: feeding in raw material stops to be OFF;

The most basic thought of following formula is exactly the deviation that the output with n+1 comes the n time output back of correction-compensation to be produced, and its method is revised dynamic set-point exactly, and so, the person who happens to be on hand for an errand is the oscillatory system of central axis for having set up one with technology set-point (SPo).Its amplitude is the size of buckles, makes system in a relative interval, and the average coal rate of coal stone is similar to or equals the technology set-point.

K value one in the following formula is by manually setting according to the factors such as granule size of coal stone, value generally between 0～1.0, in order to improve control accuracy, reduces oscillation amplitude, the present invention has further summed up people's operating experience in conjunction with the singularity of coal stone Charge Mixture Control.Above intelligent controller is optimized, introduced the expert system technology of artificial intelligence, expert's formula controller (EC) is further expanded intelligent controller (IC) function.Promptly the K value is carried out online correction.Really play the The optimal compensation effect, make the coal stone proportioning of each jar more approach the technology set-point.

Expert system is exactly an intelligent program system, and it utilizes knowledge base and inference machine to solve to have only in the professional range problem that could solve by expert or desirable outstanding operator.Because expert system not only can be utilized knowwhy, and can directly sum up and utilize people's experimental knowledge, have higher flexibility, thereby can handle uncertain problem well, this provides highly effective approach for the Based Intelligent Control of industrial process undoubtedly.

The present invention has used expert system in Based Intelligent Control, promptly penalty coefficient is carried out online correction, and then revises the dynamic set-point of coal stone (stopping reinforced value), to adapt to the variation of whole process.

Definite method of control law collection K value is as follows:

The control law collection is further to sum up people's control experience and the cover set up is suitable for the control law of different situations on the basis of IC algorithm.It has embodied a concentrated reflection of people's control behavior.The buckles size of the online sensation coal stone of this control law is in time adjusted control strategy automatically, and then in time adjusts the stop of coal stone charger.How much should being determined on a case-by-case basis of this control law, the present invention has only decided simple 10 rules and has been tested.Concrete rule is as follows:

Initial set-point is 1000t if the lapicide plants, and E is an error amount, then rule:

IF 150t≤E THEN K＝1.0

IF 120t≤E＜150t THEN K＝0.9

IF 100t≤E＜120t THEN K＝0.8

IF 80t≤E＜100t THEN K＝0.7

IF 60t≤E＜80t THEN K＝0.6

IF 40t≤E＜60t THEN K＝0.5

IF 30t≤E＜40t THEN K＝0.4

IF 0t≤E＜30t THEN K＝0.3

IF -20t≤E＜0t THEN K＝0.2

IF E＜-20t THEN K＝0.1

If the initial set-point of coal technology is 100t, E is an error amount, then rule:

IF 50t≤E THEN K＝1.0

IF 40t≤E＜50t THEN K＝0.9

IF 30t≤E＜40t THEN K＝0.8

IF 25t≤E＜30t THEN K＝0.7

IF 20t≤E＜25t THEN K＝0.6

IF 15t≤E＜20t THEN K＝0.5

IF 10t≤E＜15t THEN K＝0.4

IF 5t≤E＜10t THEN K＝0.3

IF 0t≤E＜5t THEN K＝0.2

IF E＜-10t THEN K＝0.1

Set up rule set and must satisfy following principle: f (E)=K.

Here, E={E1, E2, E3, E4, E5, E6, E7, E8, E9, E10}, K={K1, K2, K3, K4, K5, K6, K7, K8, K9, K10}.

Claims (1)

1. automatic and dynamically compensating method for proportioning materials is characterized in that it may further comprise the steps:

(1) sets the initial set-point SP for preparing burden for the first time ₀, and set the initial compensation value;

(2) calculate the initial set-point SP for preparing burden the first time of setting ₀And the first time of material actual error of weighing between the PV1;

(3) utilize rule set to retrieve the corresponding compensation COEFFICIENT K according to error amount;

(4) make SP1=K (PV1-SP ₀) be reinforced for the second time set-point; And

(5) repeat above-mentioned steps 1-4, the set-point when carrying out feeding in raw material for the N+1 time is SPn+1=SP successively ₀-K (PVn-SP ₀).