Process control is the control of the controlled system in the transformation process stage, what is

Process control in industry refers to the automatic control of process parameters such as temperature, pressure, flow rate, liquid level and composition as controlled variables. Process control, also known as real-time control, is the timely collection of detection data by the computer, and the automatic control and automatic adjustment of the control object according to the best value, such as the control of CNC machine tools and production lines.

The purpose of process control: to increase the output of production, increase the income of high-quality products, reduce energy consumption, reduce pollution, reduce the risk of production, improve the safety of production, extend the life of equipment, improve operability, and reduce labor volume.

A process control system is an automatic control system that takes the parameters that characterize the production process as the controlled quantity and makes it close to a given value or kept within a given range.

Process control has a wide range of applications in petroleum, chemical, electric power, metallurgy and other sectors. In the 50s of the 20th century, process control was mainly used to keep some parameters in the production process constant, so as to ensure stable output and quality. In the 60s, with the advent of various instrument clusters and roving inspection devices, process control has begun to transition to centralized monitoring, operation and control.

In the 70s, a multi-level computer control system combining process control optimization and management scheduling automation appeared.

An automated control system that uses the parameters that characterize the production process as the controlled quantity to bring it close to a given value or to keep it within a given range. The term "process" here refers to the process of interaction and conversion of matter and energy that takes place in a production plant or equipment. For example, the generation of steam in the boiler, the separation of ** in the fractionation column, etc.

The main parameters of the characterization process are temperature, pressure, flow, level, composition, concentration, etc. By controlling the process parameters, the product can be produced, the quality can be improved, and the energy consumption can be reduced.

(Interference), Object, Detect, Give, Compare, Calculate, Execute.

For follow-up control processes: version.

The interference acts on the object, the object state is obtained through weight detection, the deviation signal is obtained by comparing the object state with the control target (given), the deviation is analyzed and calculated, and the actuator is controlled to influence the object according to the result, and finally the interference is overcome.

For other control processes, these processes are deformed, simplified, and expressed from different angles. But it can all be seen as a special case of the above process.

The basic process of control includes the following 3 points:

1.Establish standards.

The standard is the yardstick for evaluating the performance of the work, and is the basis and basis for measuring the deviation between the actual results and the expected situation. The establishment of standards should first clarify the objects or elements that can reflect the characteristics of the objectives and affect the realization of the objectives, and then establish special standards according to the needs of the plan.

2.Measure performance.

In this stage, the manager monitors the resource allocation, operation and work results of the controlled system in accordance with the control standards, and compares the plan execution results with the planned objectives, so as to determine whether there is any deviation in order to provide the most appropriate basis for corrective actions.

3.Correction of deviations.

Correcting deviations is the key to control the collection and collation of medical education networks. There are two types of deviations: those that have occurred and those that will occur. In practice, people take different corrective measures according to the different causes of deviations that have occurred.

A corrective measure is a measure that focuses on eliminating the root cause of the deviation so that it can be corrected; Preventive measures are aimed at eliminating possible deviations in the future.

Formulate the implementation plan, put in the factors of production, implement the project implementation plan objectives in accordance with the implementation plan, collect the implementation status after completing a cycle, report the implementation status, compare the target with the actual situation, continue the next cycle if it meets the plan objectives, take corrective measures if it does not meet the plan objectives, change the overall goal to reformulate the implementation plan, if the moderate deviation from the target does not change the overall target plan, adjust the later implementation plan, if the slight deviation from the machine plan does not change the original plan and the original implementation plan, In the next cycle, bring the actual value of the target back within the planned control.

What are the basic requirements that should be met by scientific control standards?

Summary. Hello, the following are related extensions: engineering control is mainly to explain the basic principles of the automatic control system, guide students to learn the abstraction of the actual control system, complete the drawing of the mechanism diagram, the establishment of the mathematical model and the analysis and design of the control system.

The connotation of pre-control, on-site control and outcome control, as well as their respective advantages and disadvantages. 5. The basic characteristics of effective control. 6. The basic content of the control process.

7. How to choose the focus of control?

Hello dear, I'm glad to answer for you: engineering control is the unity of process control and achievement control, right, the answer is: yes, dear.

Hello dear, the following are related extensions: engineering control is mainly to explain the basic principle of the automatic control system, guide students to learn the abstraction of the actual control system, complete the drawing of the mechanism diagram, the establishment of the mathematical model and the analysis and design of the control system. The connotation of pre-control, on-site control and outcome control, as well as their respective advantages and disadvantages.

5. The basic characteristics of effective control. 6. The basic content of the control process. 7. How to choose the focus of control?

(1) The process of control includes three basic links of work:

Establish standards. Standards are norms by which people examine and measure their work and its results. The development of standards is the basis for control.

Determine the object of control: The results of business activities are the key objects that need to be controlled. The main factors affecting the business results of enterprises in a certain period include assumptions about environmental characteristics and their development trends; resource input; Organized events.

Select the focus of the control. Approach to standard-setting. There are three ways to establish standards that businesses can use:

Use statistical methods to determine expected outcomes: estimate expected outcomes based on experience and judgment; Establish engineering standards on the basis of objective quantitative analysis.

Measure the effectiveness of your efforts. Managers should pay attention to the following issues in the process of measuring work performance: through measuring performance, test the objectivity and effectiveness of standards; determine the appropriate frequency of measurement; Establish an information feedback system.

Correction of deviations. Find out the main causes of deviations; Determine the targets for the implementation of corrective measures; Choose the appropriate corrective measures. The deviation correction scheme is double-optimized. The impact of the implementation of the original plan was fully considered. Attention should be paid to dispelling doubts about corrective measures.

2) Effective control requires the flexible use of the following control methods:

Timely control: timely measures to correct the deviation of the enterprise's business activities can avoid the expansion of the deviation, or prevent the spread of the deviation on the adverse impact of the enterprise. Timely correction requires managers to grasp information that can reflect the occurrence and severity of deviations in a timely manner.

Moderate control: to prevent too much control or insufficient control; Handle the relationship between overall control and key control; So that the control that costs a certain amount of money can get enough control benefits.

Objective control: The control work should be aimed at the actual situation of the enterprise and conform to the actual situation of the enterprise.

Flexible control: Enterprises may often encounter some sudden and irresistible changes in the process of production and operation, which make the enterprise plan seriously deviate from the actual conditions. An effective control system should still function in such a situation to keep the business running, that is, it should be flexible or resilient.

The automatic control system is composed of a closed-loop circuit consisting of a measuring element, a transmitter, an automatic regulating controller, an actuator (regulating valve), and a controlled object.

Purpose: Scheduling;

Mode of operation determination;

Quality control; feedback control (auto-adjustment) and sequence control;

Prevention and remedy of failures.

Features of the process control system:

1. The characteristics of the industrial process control system: it is composed of process detection, transmission and control instruments, actuators, etc.

2. The controlled process has the characteristics of nonlinearity, time variation, time delay, and uncertainty, which makes it difficult to obtain an accurate mathematical model of the process, which increases the difficulty of transplanting control strategies.

3. The controlled process is mostly a slow process, with a certain time constant and time delay, and the control does not need to be completed in a very short time.

4. The diversity of process control schemes, the same controlled process needs to adopt different control schemes due to different disturbances. The same control concept can be applied to different production processes.

5. The common form of control in the industrial production process is fixed value control, and the purpose of process control is to ensure that the controlled variable is stable at the required set value.

6. The diversity of the means of implementation of industrial production process control can be easily realized on the computer control device; The information of the instrument can be easily obtained in the control room or in the field; The calibration and adjustment of the instrument can be carried out directly.

Process control has the following links:

The control part, the execution part, the feedback part, the load, the details are the controller such as CPU plc microcomputer, etc., the executive parts have motors, mechanical transmission parts, sensors, feedback units, etc., their role can be understood literally.

Process control has the following links: control part, execution part, feedback part, load, mainly on some, the details of the controller such as CPU plc microcomputer, etc., the executive parts have motors, mechanical transmission parts, sensors, feedback units, etc., their role can be understood literally.

1. Controlled object: It is the target that needs to be controlled by the process control system and the main link in the process control system.

2. Measuring transmitter (detection element and transmitter): used to detect controlled variables and convert the detection signal into a standard signal;

3. Controller: Compare the standard signal output by the detection and transmission link with the set value signal to obtain the deviation signal, calculate the deviation signal according to a certain control law, and calculate the output to the actuator.

4. Actuator: It is in the final position of the control loop and also becomes the "final element". It is used to receive the output signal of the controller and control the change of control variables.

Answer]: a, b

Process control refers to the timely collection and detection of data by computers in the production process.