CN101408777A - Pulse-width modulation apparatus of constant temperature oven temperature control system - Google Patents
Pulse-width modulation apparatus of constant temperature oven temperature control system Download PDFInfo
- Publication number
- CN101408777A CN101408777A CNA2008102288889A CN200810228888A CN101408777A CN 101408777 A CN101408777 A CN 101408777A CN A2008102288889 A CNA2008102288889 A CN A2008102288889A CN 200810228888 A CN200810228888 A CN 200810228888A CN 101408777 A CN101408777 A CN 101408777A
- Authority
- CN
- China
- Prior art keywords
- temperature
- width modulation
- oven
- pulse
- constant temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Feedback Control In General (AREA)
Abstract
The invention provides a pulse-width modulation device of a constant temperature oven temperature control system. The invention has the main technology characteristics that a temperature pickup is connected with a programmable controller; the programmable controller outputs pulse-width modulation of the oven by software; firstly, the temperature pickup arranged in the constant temperature oven measures temperature value by thermoelectric couple or thermal resistance which is transformed to a current signal with 4-20mA, and then is transmitted to an analog input port X12 of a PLC; the X 12 inputs the input temperature value from an input device to a specified value of the PLC for comparison, thus calculating deviation E. The device has the advantages of simple structure, easy implementation, smooth pulse-width modulation control, and high control accuracy on meter temperature, and can effectively control temperature to surpass the specified value.
Description
Technical field:
The present invention relates to a kind of at the temperature controlled pulse width modulation apparatus of constant temperature oven.
Technical background:
Temperature is one of technological parameter common in the commercial production, any physical change, all closely related with temperature with chemical reaction process, my constant temperature oven of crossing production mostly adopts temperature controller to control at present, this instrument control accuracy is low, and it is more easily to make temperature surpass set-point.
Summary of the invention:
The purpose of utility model of the present invention is the deficiency that exists in the above-mentioned technology, and a kind of a kind of temperature width modulation thermostatically-controlled equipment that utilizes Programmable Logic Controller is provided.
The purpose of this utility model is achieved in that and comprises temperature sensor, Programmable Logic Controller, pulse width modulator, constant temperature oven, input media, it is characterized in that, temperature sensor is connected with Programmable Logic Controller, and Programmable Logic Controller is realized the width modulation of baking oven is exported by software.At first be placed on temperature sensor in the constant temperature oven and may be thermoelectricity occasionally thermal resistance temperature value is measured, and convert the current signal of 4-20mA to, pass to the analog input mouth X12 of PLC, X12 compares the temperature value of input from the set-point that input media inputs to PLC so, thus calculation deviation E.As everyone knows, the digital model of the control law of PID (ratio, integration, differential) regulator is:
M＝Kp.E+KiSum(E)+Eddiff(E)
Wherein: the M-output valve
The E-deviation
The summation of deviation in Sum (E)-All Time
Diff (E)-current E and Last difference
The Kp-scale parameter
The Ki-integral parameter
The Kd-differential parameter
PID control be one very near the control mode of phase definite value, also be a kind of control of indifference.
According to the characteristics of constant temperature oven, we need pulse width modulation controlled stably.We are process variable P, and promptly temperature of oven value input value is given among the C4 of PLC, and then definite set-point S, in depositing C10.Be 0.5 second according to calculating sample time again, Kp=27, Ki=6, Kd=18 so just can work out following RLL program (see figure 3) (only for reference) in able to programme.
Advantage of the present invention is that simple in structure, easily enforcement can realize pulse width modulation controlled stably, to instrument temperature control precision height, can effectively control temperature and surpass set-point.
Description of drawings:
Fig. 1 is a structure connection layout of the present invention
Fig. 2 is PLC of the present invention and baking oven for heating device connection layout
Fig. 3 is a programmable procedure chart of the present invention
Embodiment:
Below in conjunction with accompanying drawing present embodiment is described further
Known to Fig. 1, temperature sensor is connected with Programmable Logic Controller, and Programmable Logic Controller is connected with pulse width modulator, and pulse width modulator is connected with constant temperature oven, and Programmable Logic Controller is connected with input media again.
As shown in Figure 2, be installed in the temperature sensor in the baking oven, temperature signal is taken out, and the current signal that converts 4-20mA to inputs to the X12 mouth of PLC, the A/D converter of simulating signal in PLC of X12 mouth input converts digital signal to, comparing with the set-point of importing from input media, thereby, calculation deviation E, inside PID by PLC calculates, thereby calculates output valve M, then, utilize software to realize width modulation output, thereby reaching indifference control.
Claims (1)
1, a kind of pulse width modulation apparatus of constant temperature oven temperature control system, comprise temperature sensor, Programmable Logic Controller, pulse width modulator, constant temperature oven, input media, it is characterized in that, temperature sensor is connected with Programmable Logic Controller, Programmable Logic Controller is realized the width modulation of baking oven is exported by software, at first be placed on temperature sensor in the constant temperature oven and be thermoelectricity occasionally thermal resistance temperature value is measured, and convert the current signal of 4-20mA to, pass to the analog input mouth X12 of PLC, X12 compares the temperature value of input from the set-point that input media inputs to PLC, thus calculation deviation E.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102288889A CN101408777A (en) | 2008-11-19 | 2008-11-19 | Pulse-width modulation apparatus of constant temperature oven temperature control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102288889A CN101408777A (en) | 2008-11-19 | 2008-11-19 | Pulse-width modulation apparatus of constant temperature oven temperature control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101408777A true CN101408777A (en) | 2009-04-15 |
Family
ID=40571817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008102288889A Pending CN101408777A (en) | 2008-11-19 | 2008-11-19 | Pulse-width modulation apparatus of constant temperature oven temperature control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101408777A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102364400A (en) * | 2011-07-21 | 2012-02-29 | 青岛沈源水务科技有限公司 | Temperature equalizing controller |
-
2008
- 2008-11-19 CN CNA2008102288889A patent/CN101408777A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102364400A (en) * | 2011-07-21 | 2012-02-29 | 青岛沈源水务科技有限公司 | Temperature equalizing controller |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107820556B (en) | Method and system for determining characteristic parameters of a hydraulic network | |
| CN102478862A (en) | Temperature control module and temperature control apparatus having the same | |
| WO2014185141A1 (en) | Simulation method, recording medium wherein simulation program is stored, simulation device, and system | |
| WO2011133318A3 (en) | Active cloud point controller for refining applications and related method | |
| US9256216B2 (en) | Process variable compensation in a process transmitter | |
| CN201476905U (en) | Neural network PID temperature controlled thermocouple automatic verification system | |
| CN101408777A (en) | Pulse-width modulation apparatus of constant temperature oven temperature control system | |
| CN108961977A (en) | A kind of thermal-hydraulic process variable Teaching of Automatic Control experimental provision | |
| CN110333747B (en) | Temperature and humidity control method for drying room | |
| CN103671060A (en) | Sensor-free constant current pump valve integrated device | |
| CN104180679A (en) | Digital intelligent control system for industrial furnace temperature and furnace pressure | |
| CN104679061A (en) | Temperature control system based on Dahlin algorithm | |
| US20240027979A1 (en) | Method and System for Open-Loop or Closed-Loop Control of a Technical Device | |
| Sekhar et al. | Implementation of low-cost MEMS based temperature measurement and control system using Lab VIEW and microcontroller | |
| CN103291689B (en) | Based on the controlling method of the induced pressure of the tested valve of hydraulic test bench | |
| CN106952544A (en) | The experimental provision and method of a kind of control Temperature of Electric Heater | |
| CN102364400B (en) | Temperature equalizing controller | |
| CN102010124B (en) | Automatic gas flow control device for wire drawing furnace | |
| CN101571725B (en) | Cascaded control algorithm of gene amplification equipment | |
| CN207793425U (en) | Control pressurer system and plasma deposition apparatus | |
| CN203297176U (en) | Pressure control device based on hydraulic test bench | |
| CN201548350U (en) | Thermal resistance element simulation device | |
| JP5046765B2 (en) | Process control system | |
| CN102419551A (en) | Coking heating furnace hearth pressure control method under error tolerance limit mechanism | |
| CN102541023A (en) | High-precision control system for digital and analog combination |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090415 |