SU723500A1

SU723500A1 - System for automatic control of process parameters

Info

Publication number: SU723500A1
Application number: SU762385632A
Authority: SU
Inventors: Наталья Вячеславовна Акимова; Александр Михайлович Манойло
Original assignee: Предприятие П/Я А-5593
Priority date: 1976-07-15
Filing date: 1976-07-15
Publication date: 1980-03-25

Description

1one

Изобретение относитс к автоматическому управлению технологическими процессами, параметры которых обладают случайными свойствами .The invention relates to the automatic control of technological processes, the parameters of which have random properties.

Управление представл ет собой такой спосо проведени процесса, который обеспечивает достижение максимального приближени реального процесса к критерию, характеризующему его оптимальность. Дл случайных процессов известны системы управлени , в которых указанна цель достигаетс посредством максималного использовани текущей информации о состо нии объекта.Management is such a process process that ensures that the real process is as close as possible to the criterion that characterizes its optimality. For random processes, control systems are known in which the indicated target is achieved by making the most of the current information about the state of the object.

Наиболее близкой к предлагаемому решению вл етс адаптивна система, тде управл ющее воздействие формируетс в функции скольз щего среднего арифметического значени возмущающего фактора.Closest to the proposed solution is an adaptive system, where the controlling effect is formed as a function of the moving average of the arithmetic value of the disturbing factor.

Система включает в себ последовательно соединенные измеритель текущего значени возмущени , пневмоэлектркческий преобразователь , бычислитель среднеарифметического значени возмущени , блок формировани управл ющего воздействи , последовательно соединенные формирователь функциональной зависимости возмущающего и управл ющего воздействий , блок формировани управл ющего воздейсгви , первый электропневматический преобразователь, вход которого подключен к объекту, последовательно соединенные измеритель текущего значени управл емого параметра , второй пневмоэлектрический преобразователь , вычислитель среднеарифметического значени управл емого параметра, блок сравнени блок коррекции, выход которого подключен к третьему входу блока формировани управл ющего воздействи , второй вход - к выходу задатчика коэффициента пропорциональности , а второй вход блока сравнени соединен с выходом задатчика управл емого параметра 1.The system includes a series-connected current disturbance value meter, a pneumo-electric converter, an arithmetic average of the perturbation calculator, a control action formation unit, a successively connected perturbation and control action shaping unit, a first electro-pneumatic converter, the input of which controls, the first electro-pneumatic control unit, the input of which controls the formation of a control effect, the first electro-pneumatic converter, the input of which is connected, object sequentially connected meter current value of control the second parameter, the second pneumatic electric converter, the calculator of the arithmetic mean of the controlled parameter, the comparison unit, the correction unit whose output is connected to the third input of the control action shaping unit, the second input to the output of the proportional coefficient setting unit, and the second input of the comparator unit is connected to the output of the setting unit controlled parameter 1.

Недостаток указанного технического решени заключаетс в- том, что он не учитывает характер перехода скольз щего среднего арифметического значени возмущени от одного установившегос состо ни к другому.The disadvantage of this technical solution lies in the fact that it does not take into account the nature of the transition of the moving average arithmetic value of the perturbation from one steady state to another.

Claims

The purpose of the invention is to develop a random process control system in which this disadvantage is eliminated and the stability of the controlled parameter is improved by increasing the accuracy and sensitivity of the control system. The goal is achieved by introducing into the system a shaper of time intervals between measurements of the current values of the controlled parameter, a shaper of time intervals between the meter and current disturbance values, two counters, number of intervals, a differentiator and switches, the outputs of which are connected to the inputs of the meters, perturbation values and controllability of the parameter, the first and second inputs correspond to the BUT with the object outputs and the first outputs of the formers of the time intervals between measurements of the current values perturbation and controlled parameter, the second outputs of which are connected to the inputs of the corresponding time interval counters, the outputs of which are connected to the second inputs of the calculator of arithmetic mean values of disturbance and controlled parameter, and the third output of the time interval generator between measurements of the current values of disturbance connected to the first input of the differentiator, the second input of which is connected to the output of the calculator of the arithmetic mean of the perturbations, the output to the fourth input of the forming unit control action. As an example, the alkylphenol sodium sodium dehydration stage in the production of alkyl salicylate additives is considered. The drawing shows a block diagram of the system. The system contains a control object 1, a meter 2 of the current values of the disturbance, a & switch 3, a driver 4, the time intervals between measurements of the current values of the disturbance, a pneumoelectric converter 5, a calculator 6 of the arithmetic mean of the disturbance, a differentiator 7, a driver the functional dependence of the disturbance and control action 8, the formation of the control action 9, the electropneumatic transducer Yu, the counter 11 of the interval ov, meter of current values of the controlled parameter, switch 13, shaper 14 intervals of time between measurements of the controlled parameter, second pneumoelectric converter 15, calculator 16 of the average of the controlled parameter, comparison unit 17, correction unit 18, proportionality coefficient seter 19 , counter 20 of the number of intervals, setpoint adjuster 21 of the control parameter. The device works as follows. The disturbing impact on object 1 is measured by a meter of current 2 through switch 3, controlled by actuator 4, and through pneumatic electroplating unit 5, goes to calculator 6 to determine the arithmetic average value X :. What is more, the rate of change of these averages over the time between adjacent measurements is made. The signals of average knowledge of disturbance Xj from block 6, and velocities J 3 of differentiator 7 and the signal for setting the functional dependence from shaper 8 are stored in block 9, where a control action is generated, which through an electrically inverter 10 sends a signal to the complementary organ to act on the temperature of the reactor where the process of leaking is going on. Controlling the controlled parameter and calculating its arithmetic average value y (similarly to the perturbation) for a certain time interval, it is compared with the required value y. In case of deviation of the actual value from the calculated one, the error signal from block 17 enters block 18 to form a corrective action, which enters block 9 and is summed up with the already existing control action. Analyzing the transients of the known and proposed technical solution, we see that in the known device the transient at the dewatering stage of the water channel is the temperature, in the reactor it has an oscillatory characteristic lasting about 30 minutes and an integral estimate of E 167.7 technical solution, the transition process according to the aforementioned Kanajiy has an exponential characteristic and a duration of up to 17 minutes, and the integral estimate is equal to D 107.1. The proposed technical solution allows to increase the accuracy and sensitivity of the system and to ensure the greatest agreement on the nature of the change in the control action with the nature of the change in the disturbance, which leads to an increase in the stability of the controlled parameter and ultimately to an improvement in the quality of the product obtained. Claims of the Invention System for automatic control of technological parameters, comprising the first pneumatic electric converter, the calculator of the arithmetic average of the disturbance,