KR20170013703A - The two-way feedback temperature control system and method thereof to have pulse width modulation switching structure for High Accelerated Life Test - Google Patents
The two-way feedback temperature control system and method thereof to have pulse width modulation switching structure for High Accelerated Life Test Download PDFInfo
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- KR20170013703A KR20170013703A KR1020150106746A KR20150106746A KR20170013703A KR 20170013703 A KR20170013703 A KR 20170013703A KR 1020150106746 A KR1020150106746 A KR 1020150106746A KR 20150106746 A KR20150106746 A KR 20150106746A KR 20170013703 A KR20170013703 A KR 20170013703A
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- temperature
- pwm
- chamber
- pid controller
- pwm switch
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- 238000012360 testing method Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims description 19
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 34
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- 230000007423 decrease Effects 0.000 claims description 5
- 230000001939 inductive effect Effects 0.000 claims description 3
- 230000004044 response Effects 0.000 abstract description 6
- 230000001276 controlling effect Effects 0.000 description 8
- 239000012530 fluid Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
- B06B2201/70—Specific application
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The present invention relates to a two-stage feedback control system having a PWM (Pulse Width Modulation) switching structure for temperature control of an ultra-high speed life test machine, and more particularly, The present invention relates to a two-stage feedback control system having a PWM switching structure for an ultra-high speed life test machine capable of precisely controlling a temperature by minimizing an overshoot in response to a rapid temperature change,
The present invention relates to a feedback control system for controlling the temperature of an ultrahigh speed life tester using a PWM switching structure, the control system comprising: a sensor unit installed in a chamber of a high-speed lifetime tester for measuring a temperature in the chamber; When the set temperature is inputted, the room temperature data of the sensor unit is received and compared with each other. If the difference value between the set temperature and the room temperature is a positive value, the first PID controller is operated, and the difference value between the set temperature and the room temperature (-) value, and operates the second PID controller; A PWM switch unit comprising a first PWM switch driven according to a signal of the first PID controller and a second PWM switch driven according to a signal of the second PID controller; And a heat capacity adjuster for heating or cooling the chamber in accordance with a switching operation of the PWM switch. The two-stage feedback temperature control system having a PWM switching structure for an ultra-high speed life test machine and the control therefor ≪ / RTI >
Description
The present invention relates to a two-stage feedback temperature control system and method for controlling a temperature of an ultra-high speed life tester, and more particularly, to a system and method for controlling a temperature of a chamber, Stage feedback temperature control system having a PWM switching structure for an ultra-high speed life test machine capable of precisely controlling the temperature by minimizing an overshoot and responding to sudden temperature changes when the temperature is input at a predetermined set temperature.
In general, almost all mass-produced products supplied to consumers are subjected to reliability tests to ensure high quality and reliability of products. This reliability test improves the pod and performance of the product and minimizes the defect rate. This reliability test is classified into an environmental test such as temperature and humidity, and a durability test such as vibration, shock, and fatigue. Recently, HALT (High Accelerated Life Test) and HASS (High Accelerated Stress Screening) tests are the representative reliability tests to confirm the life of the product in a short period of time with severe test environment conditions.
Accelerated tester such as Halt and Haas usually fixes the test object on the top of the vibration table and the vibrator (air hammer) using the air pressure generates vibration of the multiaxial composite waveform in the lower part of the vibration table. The reliability of the product is measured by checking the vibration characteristics of the test subject according to the frequency of the vibrator and the vibration level causing the product to fail.
When the environmental test is performed by placing the test object on the upper part of the vibration table provided in the chamber, it is necessary to keep the temperature applied to the test object constant or to change the temperature rapidly. Stable control is required in response to the temperature change when the temperature is maintained or abruptly changed.
With respect to the prior art, Patent Publication No. 10-2003-0081386 relates to a test apparatus having an environmentally controlled vibrator compartment, and a test apparatus for testing products manufactured under various climatic conditions is provided. The test apparatus includes a test chamber for accommodating the product therein and a test cabinet forming a vibrator compartment, the vibrating table having an upper surface and a lower surface located inside the test apparatus and communicating with the test chamber, Is operatively connected to the lower surface of the vibrating table and disposed in the vibrator compartment, and the climate control structure communicates with the vibrator compartment to control the temperature inside the vibrator compartment to control the environment. The above technology merely provides a control technology for heating or cooling the temperature of the chamber which is the inner compartment of the vibrator, but fails to propose an appropriate control method for maintaining the temperature in the chamber and coping with the temperature change.
In addition, Patent Publication No. 10-2010-0106379 discloses a test chamber in which temperature and humidity are controlled, in which a test is performed so that the temperature of the chamber can be operated in a mode in which the chamber is efficiently cooled without removing a considerable amount of moisture from the air The chamber technology is presented. The test chamber according to the above-described technique comprises a structure forming a working space with air and a temperature control system, the temperature control system comprising a heat exchanger positioned to communicate with the air in the work space and a low temperature fluid source A high temperature fluid source coupled to the heat exchanger, and a controller for controlling a mixture of the low temperature fluid and the high temperature fluid entering the heat exchanger. The controller is programmed to control the temperature of the mixture entering the heat exchanger to limit the temperature difference between the heat exchanger and the air in the work space, but specifically for the control method or system that can accommodate the temperature maintenance or rapid temperature changes in the chamber There is no suggestion.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a stable temperature control method by minimizing an overshoot due to temperature control so that a vibrating base of an ultra- .
It is a further object of the present invention to avoid energy contradictory to each other due to the simultaneous output of the heater and the liquefied nitrogen having different heat sources, thereby achieving rapid temperature control response and energy saving simultaneously.
According to an aspect of the present invention, there is provided a feedback control system for controlling a temperature of an ultrahigh speed life tester using a PWM switching structure, the control system comprising: A sensor unit for measuring the sensor; When the set temperature is inputted, the room temperature data of the sensor unit is received and compared with each other. If the difference value between the set temperature and the room temperature is a positive value, the first PID controller is operated, and the difference value between the set temperature and the room temperature (-) value, and operates the second PID controller; A PWM switch unit comprising a first PWM switch driven according to a signal of the first PID controller and a second PWM switch driven according to a signal of the second PID controller; And a heat capacity adjusting unit for heating or cooling the inside of the chamber according to the switching operation of the PWM switch. The present invention provides a two-step feedback temperature control system having a PWM switching structure for an ultra-high speed life test machine.
The control unit of the present invention may further include a first feed forward controller to be added to the first PID controller and a second feed forward controller to be added to the second PID controller.
The present invention also provides a method of controlling a temperature of a liquid crystal display device, the method comprising: a heating unit including a power regulator for receiving power from the PWM switching signal, a heater for receiving power from the power regulator, A control valve for controlling the discharge amount, and a cooling unit comprising a tank in which the liquefied nitrogen is stored.
According to another aspect of the present invention, there is provided a feedback control method for controlling a temperature of an ultrahigh speed life tester using a PWM switching structure, the method comprising: inputting a set temperature; When the set temperature is inputted, the set temperature and the room temperature inside the chamber are measured. When the set temperature is higher than the room temperature, the first PID controller is operated. If the set temperature is lower than the room temperature, the second PID controller is operated ; Operating the first PWM switch in accordance with the first PID control signal and operating the second PWM switch in accordance with the second PID control signal; A power regulator is operated by the first PWM switch and an ON / OFF type control valve is operated by the second PWM switch; And a step of measuring the room temperature and feeding back the temperature data to the PWM switches. The present invention provides a two-step feedback temperature control method for a high-speed life test machine having a PWM switching structure.
In the present invention, when the set temperature is input, a first feed forward controller for operating the temperature increase to a predetermined slope value is operated, and a second feed forward controller for operating the temperature down to the predetermined slope value is operated And a signal from each feedforward controller and a signal from each PID controller are summed and a control signal is transmitted to each PWM switch.
As described above, the present invention is advantageous in that the feed-forward feedback control is performed in order to improve the quick response performance of the ultra-accelerated life testing machine, so that the response performance is excellent and the temperature can be controlled appropriately.
Further, by performing the switching control at the rear end of the PID controller of the present invention, it is possible to prevent the control interference due to the simultaneous output of the heater and the liquefied nitrogen, thereby minimizing the quick response performance and the energy waste.
Further, since the switching control of the present invention carries out the PWM control, it is possible to minimize the swinging occurring in the control of the simple ON / OFF type switch.
Also, according to the present invention, it is possible to eliminate the overshoot by eliminating the integral gain error when the temperature is close to the target value temperature, to induce the stable control, and to adjust the integral gain error erasure point to facilitate the temperature control tuning.
1 is a control block diagram according to the present invention;
2 is a control graph according to a control system according to the present invention.
3 is a schematic perspective view of a high-speed life test machine according to the present invention.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are intended to illustrate the present invention in a manner that allows a person skilled in the art to easily carry out the invention, And this does not mean that the technical idea and scope of the present invention are limited.
FIG. 1 is a control block diagram according to the present invention, FIG. 2 is a control graph according to a control system according to the present invention, and FIG. 3 is a schematic perspective view of a high-speed life test machine according to the present invention.
1 and 2, the control system S10 according to the present invention includes a sensor unit (not shown) installed inside the chamber of the ultra-high speed
Specifically, the sensor unit is installed in the chamber of the ultra-high speed
Further, a feed forward controller (S24, S25) may be added to the control unit S20. The feed forward controllers S24 and S25 provide a control signal such that the temperature can rise or fall while having a specific slope based on the currently set set temperature. Therefore, a sudden temperature change or a gentle temperature change can be given according to the control signal of the feed forward controller. The first feed forward controller S24 is operated to raise the temperature and the second feed forward controller S24 is operated to lower the temperature.
The control signals of the feedforward controllers S24 and S25 are summed with the PID control signals (S26 and S27). The integral gain and differential gain due to the feedforward control signal can be eliminated by the PID control signal. Therefore, appropriate temperature control tuning becomes possible, and overshoot by PID control can be prevented. In the present invention, in order to prevent occurrence of overshoot during abrupt temperature control, when the value reaches 90% or more of the target temperature, the integral gain error is eliminated to prevent overshoot, and the integral gain error is eliminated, Thereby enabling stable control and facilitating temperature control tuning by adjusting the integral gain error erasure time. FIG. 2 shows control for eliminating the integral gain error and differential error.
The control signal to which the first PID control signal and the feedforward control signal are added (S26) is transmitted to the first PWM switch S31. The temperature is raised by the progressive switching operation by the PWM (pulse width modulation) switch, and the switching operation is progressively performed, so that the swinging may be hardly generated compared with the switching by ON / OFF as in the conventional case. Therefore, it is possible to gradually raise and lower the temperature, and stable temperature control can be possible. In addition, the control signal to which the second PID control signal and the feedforward control signal are added (S27) is transmitted to the second PWM switch S32. In this case as well, the switch is gradually operated to lower the temperature, so that the swinging by the switching operation hardly occurs.
Next, the PWM switch S30 receives a control signal from the control unit S20 and performs a switching operation. The first PWM switch S31 operates a power regulator (not shown), and the first PWM switch S31 supplies a current to the heater through the power regulator by a gradual ON / OFF operation, So that the temperature of the heater can be adjusted. That is, when a sudden increase in temperature is desired, the amount of current can be increased to increase the divergence temperature of the heater, and the temperature in the chamber sharply increases due to the heat dissipation of the heater. The second PWM switch S32 controls the valve opening / closing amount of a control valve (not shown) connected to the liquid nitrogen tank (not shown). In other words, the second PWM switch S32 gradually increases the valve opening of the control valve by the gradual ON / OFF operation, and gradually decreases the temperature as the valve is gradually opened. If a sudden temperature drop is required, it is gradually opened by the PWM switch, but gradually the amount of liquefied nitrogen is injected into the chamber, so that the temperature in the chamber falls rapidly.
Next, the heat capacity increase / decrease section S40 is operated by the switching operation of the PWM switch S30. The heat capacity addition / subtraction unit S40 includes a heater S41 for receiving a switching signal from the first PWM switch S31 to supply electric power to the chamber and supplying the heat to the chamber, And a control valve S42 for supplying nitrogen. The heater S41 is operated in accordance with the switching operation of the first PWM switch S31, and the power regulator supplies current to the heater S41. The amount of heat that the heater S41 emits varies depending on the amount of current supplied to the heater S41. The control valve S42 is for regulating the amount of the liquid nitrogen supplied through the roll of the liquefied nitrogen tank (not shown). The valve opening amount of the control valve S42 is determined by the second PWM switch signal, And the amount of the liquefied nitrogen is determined. As a result, the temperature in the chamber is lowered.
The temperature data by the sensor unit is fed back to the controller side as well as to each PWM switch. Therefore, the PWM switch can be adjusted according to the room temperature inside the chamber to be fed back.
A control method by the control system according to the present invention will be briefly described. A temperature control method according to the present invention includes: inputting a set temperature; When the set temperature is inputted, the set temperature and the room temperature inside the chamber are measured. When the set temperature is higher than the room temperature, the first PID controller is operated. If the set temperature is lower than the room temperature, the second PID controller is operated ; Operating the first PWM switch in accordance with the first PID control signal and operating the second PWM switch in accordance with the second PID control signal; A power regulator is operated by the first PWM switch and an ON / OFF type control valve is operated by the second PWM switch; And measuring the room temperature and feeding back the temperature data to the respective PWM switches.
As shown in FIG. 1, the user inputs a desired set temperature at an input terminal. The inputted set temperature is compared with the room temperature data transmitted through the sensor unit installed in the chamber before the signal is transmitted to the controller. If the difference value is a positive value, the heater must be driven, so that the first PID controller And when the compared difference value is negative, the second PID controller is operated. The first PID or the second PID control is executed based on a value obtained by subtracting the room temperature from the set temperature.
Further, when the set temperature is input, a first feed forward controller for inducing a temperature rise to a predetermined slope value is executed, and a second feed forward controller for inducing a temperature fall to a predetermined slope value may be executed. When it is necessary to rapidly change the set temperature, the feed forward controller sets a desired slope value and inputs a signal to the PWM switch to increase or decrease the temperature according to the inputted constant slope value. Also, the signal executed by the feedforward controller is added to the control signal from each PID controller to transmit the control signal to each PWM switch.
The integral gain generated by the control signal by the feed forward and the control signal by the PID is deleted when the target value reaches 90% or more of the set value, thereby overshoot is eliminated. As the overshoot is eliminated, stable control can be induced and temperature erasure tuning of the integral gain can be adjusted to facilitate the temperature zero tuning.
The control signal is transmitted to the PWM switch, the first PWM switch is operated for the difference value (+), and the second PWM switch is operated for the difference value (-). The first PWM switch generally regulates the power regulator, which regulates the amount of current supplied to the heater. The amount of heat to be emitted from the heater is determined according to the amount of current supplied to the heater. The second PWM switch adjusts the opening and closing amount of the control valve. If the valve is opened for a certain period of time, the amount of the liquefied nitrogen to be supplied into the chamber increases, and when the valve is opened to a small extent, the amount of the liquefied nitrogen to be supplied into the chamber decreases. As a result, the temperature inside the chamber can rise sharply or slowly, and can also drop sharply or gently.
Further, the PWM switch may be controlled in the amount of switching by receiving data of the chamber room temperature from the sensor unit. That is, since the switching operation of the PWM switch repeats ON / OFF with a constant pulse width, it is possible to adjust the amount of current by the switching operation and the amount of opening and closing of the valve by modulating the pulse width according to the room temperature data. In addition, it is possible to minimize the sluggishness during the control compared to the conventional ON / OFF switch by the PWM switching operation.
In the present invention, the reference value is determined by comparing the set temperature with the room temperature in the chamber, and it is possible to determine which controller is to be executed beforehand based on the predetermined reference value, so that the contrary control interference between the liquefied nitrogen and the heater can be prevented.
Fig. 3 shows the entirety of the ultra-high speed
It is to be understood by those skilled in the art that the present invention can be embodied in many other forms without departing from the spirit and scope of the invention, even if some embodiments have been described above. It is therefore intended that the above-described embodiments be considered as illustrative rather than restrictive, and that all implementations within the scope of the appended claims and their equivalents are intended to be included within the scope of the present invention.
1: High-speed life test machine
30: front support frame
40: Vibration table
50: door 51: door home
100a, 100b, 100c, 100d:
S10: Temperature control system S11:
S20: Control section S21:
S22: First PID controller S23: Second PID controller
S24: first feed forward controller S25: second feed forward controller
S26: first summing unit S27: second summing unit
S30: PWM switch section S31: first PWM switch
S32: second PWM switch
S40: Heat capacity addition / subtraction part S41: Heater
S42: Liquefied nitrogen supply control valve
S50: control side temperature feedback S51: first PWM switch feedback
S52: Second PWM switch feedback
Claims (5)
The control system includes:
A sensor unit installed inside the chamber of the ultrahigh speed life test machine for measuring the temperature in the chamber;
When the set temperature is inputted, the room temperature data of the sensor unit is received and compared with each other. If the difference value between the set temperature and the room temperature is a positive value, the first PID controller is operated, and the difference value between the set temperature and the room temperature (-) value, and operates the second PID controller;
A PWM switch unit comprising a first PWM switch driven according to a signal of the first PID controller and a second PWM switch driven according to a signal of the second PID controller; And
A heat capacity increase / decrease unit for heating or cooling the chamber according to the switching operation of the PWM switch unit;
And a second feedback temperature control system having a PWM switching structure for an ultra-high speed life test machine.
In the control unit,
Further comprising a first feed forward controller to be summed with the first PID controller and a second feed forward controller to be summed with the second PID controller. ≪ RTI ID = 0.0 > Control system.
Wherein the calorimetric /
A heater for receiving electric power from the first PWM switching signal and supplying the electric power to the chamber,
And a control valve for receiving the second PWM switching signal to supply liquefied nitrogen into the chamber from the liquefied nitrogen storage tank.
Inputting a set temperature;
When the set temperature is inputted, the set temperature and the room temperature inside the chamber are measured. When the set temperature is higher than the room temperature, the first PID controller is operated. If the set temperature is lower than the room temperature, the second PID controller is operated ;
Operating the first PWM switch in accordance with the first PID control signal and operating the second PWM switch in accordance with the second PID control signal;
A power regulator is operated by the first PWM switch and an ON / OFF type control valve is operated by the second PWM switch; And
Measuring the room temperature and feeding back temperature data to the PWM switches;
Stage feedback temperature control method having a PWM switching structure for an ultra-high speed life test machine
A second feed forward controller for operating the first feed forward controller to induce a temperature rise to a predetermined slope value is operated and a second feed forward controller for inducing a temperature fall to a predetermined slope value is operated,
Wherein a signal from each feedforward controller and a signal from each PID controller are summed and a control signal is transmitted to each PWM switch.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150106746A KR20170013703A (en) | 2015-07-28 | 2015-07-28 | The two-way feedback temperature control system and method thereof to have pulse width modulation switching structure for High Accelerated Life Test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150106746A KR20170013703A (en) | 2015-07-28 | 2015-07-28 | The two-way feedback temperature control system and method thereof to have pulse width modulation switching structure for High Accelerated Life Test |
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| KR20170013703A true KR20170013703A (en) | 2017-02-07 |
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| KR1020150106746A KR20170013703A (en) | 2015-07-28 | 2015-07-28 | The two-way feedback temperature control system and method thereof to have pulse width modulation switching structure for High Accelerated Life Test |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102099582B1 (en) * | 2019-06-25 | 2020-04-16 | 박길종 | PID control method applied to precision machine tools |
| IT201900007049A1 (en) * | 2019-05-21 | 2020-11-21 | F Lli Pedrotti S R L | A METHOD FOR KEEPING THE VALUE OF A PARAMETER IN A WORKING CHAMBER IN A SURROUNDING A SET-POINT VALUE AS WELL AS A SYSTEM THAT CAN BE USED IN THIS METHOD |
| KR20210137346A (en) * | 2020-05-09 | 2021-11-17 | 제이에이취엔지니어링주식회사 | The manufacturing system of the cryogenic sensor for recycling and the system using it |
| CN114384404A (en) * | 2022-03-23 | 2022-04-22 | 上海菲莱测试技术有限公司 | Cooling test assembly unit and aging cooling device |
-
2015
- 2015-07-28 KR KR1020150106746A patent/KR20170013703A/en not_active Application Discontinuation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201900007049A1 (en) * | 2019-05-21 | 2020-11-21 | F Lli Pedrotti S R L | A METHOD FOR KEEPING THE VALUE OF A PARAMETER IN A WORKING CHAMBER IN A SURROUNDING A SET-POINT VALUE AS WELL AS A SYSTEM THAT CAN BE USED IN THIS METHOD |
| WO2020234702A1 (en) * | 2019-05-21 | 2020-11-26 | F.Lli Pedrotti S.R.L. | Method, system, computer program and programmable logic unit for controlling a working device, such as a burner or the like |
| KR102099582B1 (en) * | 2019-06-25 | 2020-04-16 | 박길종 | PID control method applied to precision machine tools |
| KR20210137346A (en) * | 2020-05-09 | 2021-11-17 | 제이에이취엔지니어링주식회사 | The manufacturing system of the cryogenic sensor for recycling and the system using it |
| CN114384404A (en) * | 2022-03-23 | 2022-04-22 | 上海菲莱测试技术有限公司 | Cooling test assembly unit and aging cooling device |
| CN114384404B (en) * | 2022-03-23 | 2022-08-23 | 上海菲莱测试技术有限公司 | Cooling test assembly unit and aging cooling device |
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