System control method based on maintenance type human-simulating PID

A control method and holding technology, applied to controllers with specific characteristics, electric controllers, etc., can solve problems such as frequent mutations in system control, large deviation signals, and system instability, etc., and achieve high promotion and application value, The effect of small overshoot and simple programming

Inactive Publication Date: 2010-10-13
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] ① The integral function of the ordinary PID controller treats all deviation signals e(t) equally, without selectivity;
[0005] ②As long as the deviation signal e(t) exists, the ordinary PID controller will always integrate, so it is easy to cause "integral saturation"
[0009] ①The controller is at (t 0 , t 1 ) interval has only proportional action and no integral action. If the proportional gain is not selected properly, the deviation signal e(

Method used

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  • System control method based on maintenance type human-simulating PID
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  • System control method based on maintenance type human-simulating PID

Examples

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Example Embodiment

[0065] Example 1

[0066] In this embodiment, the controlled variable y of the controlled object 3 is a liquid level parameter, the actuator 2 is a valve, the controlled object 3 is a liquid level tank, the measuring device 4 is a liquid level transmitter, and the PID The controller, valve, liquid level tank and liquid level transmitter form a complete liquid level control system.

[0067] In the actual operation process, the control calculation process of the PID controller in the liquid level control system is:

[0068] Step 1: Obtain the deviation signal e(t): use the liquid level transmitter to detect the liquid level parameter y of the liquid level tank in real time, and synchronize the detected signal r(t) with the set signal r through the difference comparator 0 (t) Compare the difference and get the liquid level deviation signal e(t). The obtained liquid level deviation signal e(t) is detailed in figure 2 ; The difference comparator synchronously sends the level deviation si...

Example Embodiment

[0092] Example 2

[0093] In this embodiment, the difference from embodiment 1 is: the controlled variable y of the controlled object 3 is a temperature parameter, the actuator 2 is a heater, the controlled object 3 is a thermostat, and the measuring device 4 is a temperature transmitter And the PID controller, heater, constant temperature box and temperature transmitter form a complete constant temperature control system.

[0094] In the actual operation process, the control calculation process of the PID controller in the constant temperature control system is:

[0095] Step 1: Obtain the deviation signal e(t): use a temperature transmitter to detect the temperature parameter y of the thermostat in real time, and synchronize the detected signal r(t) with the set signal r through the difference comparator 0 (t) Perform a difference value comparison and obtain a temperature deviation signal e(t); the difference value comparator synchronously transmits the liquid level deviation signa...

Example Embodiment

[0101] Example 3

[0102] In this embodiment, the difference from embodiment 1 is: the controlled variable y of the controlled object 3 is a voltage parameter, the actuator 2 is a switch control device, the controlled object 3 is a controllable voltage source, and the measuring device 4 is Voltage transmitter, and the PID controller, switch control device, controllable voltage source and voltage transmitter form a complete constant voltage control system.

[0103] In the actual operation process, the control calculation process of the PID controller in the constant pressure control system is:

[0104] Step 1: Obtain the deviation signal e(t): use a voltage transmitter to detect the voltage parameter y output by the controllable voltage source in real time, and synchronize the detected signal r(t) with the set signal through the difference comparator r 0 (t) Perform a difference comparison and obtain a voltage deviation signal e(t); the difference comparator synchronously transmits t...

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Abstract

The invention discloses a system control method based on a maintenance type human-simulating PID, which comprises the following steps: 1, acquiring an error signal; 2, carrying out maintenance type human-simulating PID control calculation for the error signal: dividing the control process of a controller into a plurality of time intervals, classifying the time intervals into integral maintenance intervals and integral action intervals for processing according to a chronological sequence, wherein the integral action maintains the final integral value of a previous time interval in the integral maintenance intervals, and the integral operation is carried out based on the integral action of the previous time interval in the integral action intervals; and outputting a control signal to control an actuator; and 3, controlling the actuator, making adjustment through the actuator according to the controlled variable of a controlled object, and promptly detecting the controlled variable with a measuring device. The invention has the advantages of reasonable design, delicate concept, convenient realization, wide scope of application and good control effect, and the control system adopting the maintenance type human-simulating PID control method has the advantages of short control period, small overshoot and high anti-interference capability.

Description

technical field [0001] The invention belongs to the technical field of PID automatic control, and in particular relates to a system control method based on a holding type humanoid PID. Background technique [0002] Nowadays, negative feedback control systems are widely used in the field of industrial automation, combining figure 1 , a complete closed-loop negative feedback control system generally consists of four links: controller 1, actuator 2, controlled object 3 and measuring device 4. Among them, the measuring device 4 is used to measure the controlled variable y of the controlled object 3, and transform it into the signal required by the controller 1; the controller 1 according to the set value r 0 (t) The deviation signal e(t) obtained by comparing with the measured value r(t) sent by the measuring device is calculated according to a certain operation rule to obtain the corresponding control signal u(t), and the control signal The actuator 2 receives the control sig...

Claims

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Application Information

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IPC IPC(8): G05B11/42
Inventor 王再英金晶郭琳
Owner XIAN UNIV OF SCI & TECH
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