Control method of precise constant-temperature test box

Abstract

The invention discloses a control method of a precise constant-temperature test chamber, and relates to the field of technical temperature control and automatic tests.The method adopts a control system of the precise constant-temperature test chamber for operation, and comprises a temperature control module, a test process automation module, a linkage coordination module and a data feedback diagnosis module. The control method of the precise constant-temperature test box comprises the following steps: detecting temperature data in the test box in real time through a temperature sensor, and transmitting the data to a temperature control module; according to the preset target temperature and the current temperature data, a segmented temperature rise or temperature drop strategy is adopted, and automatic switching between low-speed temperature change and high-speed temperature change is achieved; in the temperature change process, the current test process parameters are detected through a judgment module, a parameter linkage formula between the temperature and the test steps is established, and temperature control parameters are subjected to linkage adjustment; according to the invention, the limitation caused by independent operation of the traditional temperature control and test process is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control and automated testing, and particularly to a control method for a precision constant temperature test chamber. Background Art

[0002] Currently, electronic products often face two key problems during use. First, in practical applications, since electronic components are composed of various materials, there are significant differences in the thermal expansion coefficients of these materials. When an electronic product rapidly enters a high-temperature environment from a low-temperature environment, sudden temperature changes in local areas are likely to cause thermal stress concentration, which in turn leads to faults such as damage to electronic components and cracking of solder joints, seriously affecting the reliability and service life of the product. Traditional test chambers mostly adopt a temperature control method with a fixed rate, lacking targeted designs for segmented temperature control and alleviation of local thermal stress, and it is difficult to meet the strict requirements for temperature stability and uniformity in actual tests.

[0003] Second, the environmental adaptability tests of electronic products usually involve multiple complex test items such as temperature cycling, vibration, and electromagnetic compatibility. Most of the existing test procedures rely on manual operations, and there are problems such as inaccurate parameter settings and loose connections between test links. Due to the lack of a control system with a high degree of automation and real-time linkage of each test link, the test efficiency is low, and errors are easily introduced due to human factors, ultimately affecting the accuracy and repeatability of test data.

[0004] Therefore, there is an urgent need for a control method for a precision constant temperature test chamber to organically combine temperature control and test process automation, while achieving balanced temperature control, ensuring precise connection of each test link, and thus achieving the purpose of improving the overall performance. Summary of the Invention

[0005] The purpose of the present invention is to provide a control method for a precision constant temperature test chamber to solve the problems raised in the above background art.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A control method for a precision constant temperature test chamber, which operates using the control system of the precision constant temperature test chamber, including a temperature control module, a test process automation module, a linkage coordination module, and a data feedback diagnosis module. The control method for the precision constant temperature test chamber includes the following steps:

[0007] Real-time detect the temperature data inside the test chamber through a temperature sensor and transmit the data to the temperature control module;

[0008] According to the preset target temperature and the current temperature data, adopt a segmented temperature rise or temperature drop strategy to achieve automatic switching between low-speed and high-speed temperature changes;

[0009] During the temperature change process, the current test process parameters are detected by the judgment module, and a parameter linkage formula between temperature and test steps is established to perform linkage adjustment on the temperature control parameters;

[0010] The test process automation module automatically executes each test step according to the preset test item sequence and is linked with the temperature control module;

[0011] The data feedback and diagnosis module collects temperature, vibration, and pressure data in real time and performs anomaly judgment through fuzzy logic algorithms to automatically send warning signals;

[0012] When an anomaly occurs in the temperature or test process, the linkage coordination module automatically sends adjustment instructions to control the synchronous adjustment of the temperature control module and the test process automation module until normal operation is restored.

[0013] According to the above technical solution, the temperature control module is used to precisely control the temperature in the test chamber, and the specific operation steps are as follows:

[0014] In the initial stage, the temperature data in the test chamber is monitored in real time through the temperature sensing device;

[0015] Based on the difference between the preset target temperature and the current temperature, it is judged whether segmented control is required;

[0016] Before the temperature approaches the target temperature, heating or cooling is performed at a lower rate. When the temperature reaches the preset critical value, it automatically switches to a faster rate for the final adjustment;

[0017] During the temperature control process, the risk of heat stress concentration is dispersed by using buffer material design, and the buffer materials include silica gel pads and graphite sheets.

[0018] According to the above technical solution, the test process automation module uses a PLC as the core control unit to achieve automatic switching and linkage control of multiple test items through a preset program, specifically including:

[0019] After the test starts, the PLC controller first reads the real-time data transmitted back by the temperature control module and compares it with the preset test process parameters;

[0020] When the temperature data is within the safe range, the PLC sequentially starts the corresponding test items and realizes seamless switching between the items;

[0021] During the test process, if it is detected that the temperature or other key parameters exceed the preset tolerance, the PLC automatically executes the shutdown protection program and simultaneously sends an abnormal status signal to the linkage coordination module.

[0022] According to the above technical solution, the linkage control module realizes multi-parameter comprehensive adjustment by establishing a linkage formula between temperature and test process. The main functions of this module are as follows:

[0023] Establish the parameter linkage formula between temperature and test steps, and its algorithm expression is as follows: T a =T t +K1·(Δt)+K2·f(step,δ); where T a Indicates the actual temperature, T t represents the target temperature, Δt is the time interval of temperature change, K1 and K2 are both system adjustment coefficients, and f(step,δ) is the function of the current test step and the error factor;

[0024] After the test process is started, the linkage coordination module cross-judges the temperature data and process data in real time. When it is found that the temperature change does not match the test steps or exceeds the preset tolerance, the early warning mechanism is immediately activated, the temperature change rate is automatically adjusted, and the next test link is suspended to ensure the stable operation of the overall test process.

[0025] According to the above technical solution, the data feedback diagnosis module is used to collect, analyze and warn of faults in real time during the test. The specific measures are as follows:

[0026] An independent data acquisition unit is installed in each module to record temperature, pressure, vibration, and electronic signal parameters in real time;

[0027] Identify potential abnormal conditions through fuzzy logic algorithms and issue fault warnings as soon as possible;

[0028] The data feedback diagnosis module also includes a later data storage and comparison function, which facilitates the analysis of the inherent relationship between temperature changes and various parameters in the test process, and provides data support for subsequent improvements;

[0029] The linkage feedback mechanism enables the test chamber to adjust automatically, reducing the failure of the whole machine caused by abnormal local parameters.

[0030] According to the above technical solution, the temperature control module adopts an advanced PID controller and performs closed-loop regulation in combination with temperature sensor data. The specific implementation includes:

[0031] The temperature data of different positions in the test chamber are obtained in real time through high-precision temperature sensors, and the data is transmitted to the central controller;

[0032] The central controller uses the PID formula according to the set target temperature and temperature change curve. Perform real-time calculations to calculate the output power required for heating or cooling; where U(t) is the control output, e(t) = Tt -T c is the temperature error, in K p , K i , K d are the proportional, integral, and derivative coefficients respectively, and T t is the target temperature, in T c is the current temperature;

[0033] Feed the operation result back to the temperature control actuator to achieve precise control of the heater or cooling system;

[0034] When the temperature approaches the preset critical value, the system automatically adjusts the PID parameters to ensure the minimum temperature fluctuation during the temperature rise or fall process. At the same time, through multi-point temperature data comparison, ensure the overall temperature in the test chamber is evenly distributed, so as to achieve the precise constant temperature effect.

[0035] According to the above technical solution, the temperature control module, test process automation module, linkage coordination module, and data feedback diagnosis module are all interconnected and communicate through the internal digital bus. The specific implementation method is as follows:

[0036] Each module is equipped with an independent digital signal processing unit, and transmits temperature, time, and process status parameters in real time through the internal bus;

[0037] The bus system is designed with redundant lines and error detection mechanisms, which can automatically switch to the standby line when a single path fails, ensuring the continuity and reliability of data transmission;

[0038] After receiving the data from each module, the linkage coordination module performs multi-parameter coordinated adjustment according to the preset linkage formula, and feeds it back to each module through the digital bus to adjust their respective operation states in real time.

[0039] According to the above technical solution, the control method of the precision constant temperature test chamber further includes the steps of test data storage and report generation, specifically including:

[0040] During the test, the temperature, vibration, pressure, humidity, and other relevant data collected by each module are automatically stored in the central database after being processed by the data feedback diagnosis module;

[0041] Data storage uses time series recording and segmented archiving technologies to ensure that the data of each test stage is completely preserved and is convenient for subsequent comparison and analysis;

[0042] After the test is completed, the system automatically generates a test report and records the temperature curve, the change trend of each parameter, and the abnormal warning record during the test process;

[0043] Finally, statistical and trend analysis are performed on the test data according to a preset algorithm, and detailed technical indicators and fault analysis conclusions are output, providing a data basis for optimizing subsequent test plans and improving equipment, and enhancing the transparency and traceability of the overall test.

[0044] According to the above technical solution, the control method of the precision constant temperature test chamber further includes an automatic connection step in the preheating and temperature stabilization stages, specifically including:

[0045] Before the test starts, the system first enters the preheating stage, and slowly raises the temperature of the test chamber to the preset initial temperature at a low rate through the temperature control module;

[0046] After the preheating stage ends, the system automatically detects whether the temperatures of each measuring point in the test chamber reach the preset equilibrium value. If so, it automatically switches to the temperature stabilization stage and maintains the temperature within the set range;

[0047] During the temperature stabilization stage, the temperature control module continuously monitors the temperature fluctuations, and uses the PID adjustment and linkage control module to coordinate and adjust the test process to ensure that the temperature in the test chamber is always in a stable state.

[0048] Compared with the prior art, the beneficial effects achieved by the present invention are: by establishing a mathematical model and a feedback algorithm between temperature and the test process, the present invention realizes multiple closed-loop regulations of temperature control, process, and data feedback. When temperature anomalies or test steps do not match are detected, the system can quickly respond and automatically adjust the operating states of each module to ensure that the overall system is always in a safe and stable operating state. Description of the Drawings

[0049] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention.

[0050] In the drawings:

[0051] Figure 1 is a schematic flow chart of the control method of the precision constant temperature test chamber of the present invention. Detailed Embodiments

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0053] Please refer to Figure 1, the present invention provides a technical solution: a control method for a precision constant temperature test chamber. This method operates using the control system of the precision constant temperature test chamber, including a temperature control module, an experimental process automation module, a linkage coordination module, and a data feedback diagnosis module. The control method for the precision constant temperature test chamber includes the following steps:

[0054] Step S1: Real-time detect the temperature data inside the test chamber through a temperature sensor and transmit the data to the temperature control module;

[0055] Step S2: According to the preset target temperature and the current temperature data, adopt a segmented temperature rise or temperature drop strategy to achieve automatic switching between low-speed and high-speed temperature changes;

[0056] Step S3: During the temperature change process, detect the current experimental process parameters through a judgment module and establish a parameter linkage formula between the temperature and the experimental steps to perform linkage adjustment on the temperature control parameters;

[0057] Step S4: The experimental process automation module automatically executes each experimental step according to the preset experimental item sequence and is linked with the temperature control module;

[0058] Step S5: The data feedback diagnosis module real-time collects temperature, vibration, and pressure data and performs abnormal judgment through a fuzzy logic algorithm to automatically send out a warning signal;

[0059] Step S6: When an abnormality occurs in the temperature or the experimental process, the linkage coordination module automatically sends out an adjustment instruction to control the temperature control module and the experimental process automation module to make synchronous adjustments until normal operation is restored.

[0060] The temperature control module is used to precisely control the temperature inside the test chamber. The specific operation steps are as follows:

[0061] In the initial stage, real-time monitor the temperature data inside the test chamber through a temperature sensing device;

[0062] Judge whether segmented control is required according to the preset target temperature and the current temperature difference;

[0063] Before the temperature approaches the target temperature, heat or cool at a lower rate. When the temperature reaches the preset critical value, automatically switch to a faster rate for the final adjustment;

[0064] During the temperature control process, use the design of buffer materials to disperse the risk of heat stress concentration. The buffer materials include silica gel pads and graphite sheets.

[0065] The experimental process automation module uses a PLC as the core control unit to achieve automatic switching and linkage control of multiple experimental items through a preset program. Specifically, it includes:

[0066] After the test starts, the PLC controller first reads the real-time data transmitted back by the temperature control module and compares it with the preset test process parameters;

[0067] When the temperature data is within the safe range, the PLC starts the corresponding test items in sequence and realizes seamless switching between each item;

[0068] During the test, if it is detected that the temperature or other key parameters exceed the preset tolerance, the PLC automatically executes the shutdown protection program and simultaneously sends an abnormal status signal to the linkage coordination module to adjust the test process in a timely manner; This automated test process can be monitored and parameter-adjusted in real time through a remote monitoring platform, improving the flexibility and safety of the test process and reducing the error risk caused by manual operation.

[0069] The linkage control module realizes multi-parameter comprehensive adjustment by establishing a linkage formula between temperature and the test process. The main functions of this module are as follows:

[0070] Establish a parameter linkage formula between temperature and test steps, and its algorithm expression is as follows: T a =T t +K1·(Δt)+K2·f(step,δ); where T a represents the actual temperature, T t represents the target temperature, Δt is the temperature change time interval, K1 and K2 are both system adjustment coefficients, and f(step,δ) is a function of the current test step and the error factor;

[0071] After the test process starts, the linkage coordination module makes cross-judgments on the temperature data and process data in real time. When it is found that the temperature change does not match the test step or exceeds the preset tolerance, the warning mechanism is immediately started, the temperature change rate is automatically adjusted, and the next test link is paused to ensure the stable operation of the overall test process.

[0072] The data feedback diagnosis module is used to collect, analyze and give fault warnings for various data during the test. The specific measures are as follows:

[0073] Install an independent data acquisition unit in each module to record temperature, pressure, vibration, and electronic signal parameters in real time;

[0074] Identify potential abnormal states through fuzzy logic algorithms and give fault warnings in the first time;

[0075] The data feedback diagnosis module also includes the function of storing and comparing later data, which is convenient for analyzing the internal relationship between temperature changes and various parameters in the test process and providing data support for subsequent improvements;

[0076] The linkage feedback mechanism enables the test chamber to automatically adjust, reducing the occurrence of overall machine failure caused by abnormal local parameters.

[0077] The temperature control module adopts an advanced PID controller and performs closed-loop regulation in combination with the data of temperature sensors. Its specific implementation includes:

[0078] Obtain the temperature data at different positions inside the test chamber in real time through high-precision temperature sensors, and transmit the data to the central controller;

[0079] The central controller calculates in real time according to the set target temperature and temperature change curve using the PID formula to calculate the output power required for heating or cooling; where U(t) is the control output, e(t) = T t -T c is the temperature error, K p 、K i 、K d are the proportional, integral, and differential coefficients respectively, T t is the target temperature, and T c is the current temperature;

[0080] Feed the operation result back to the temperature control actuator to achieve precise control of the heater or cooling system;

[0081] When the temperature approaches the preset critical value, the system automatically adjusts the PID parameters to ensure the minimum temperature fluctuation during the temperature rise or fall process. At the same time, through multi-point temperature data comparison, ensure the uniform distribution of the overall temperature inside the test chamber, so as to achieve the precise constant temperature effect.

[0082] The temperature control module, test process automation module, linkage coordination module, and data feedback diagnosis module are all interconnected and communicate through the internal digital bus. The specific implementation method is:

[0083] Each module is equipped with an independent digital signal processing unit, and transmits temperature, time, and process status parameters in real time through the internal bus;

[0084] The bus system is designed with redundant lines and error detection mechanisms, which can automatically switch to the standby line when a single path fails, ensuring the continuity and reliability of data transmission;

[0085] After receiving the data from each module, the linkage coordination module performs multi-parameter collaborative adjustment according to the preset linkage formula, and feeds back to each module through the digital bus to adjust their respective operation states in real time; Through the above steps, not only the high-efficiency coordination between modules is ensured, but also the goals of high speed, low latency, and high reliability are achieved during data transmission, providing a solid information transmission guarantee for the automatic control of the entire test process, and effectively preventing test out-of-control caused by communication failures.

[0086] The control method of the precision constant temperature test chamber further includes steps of storing test data and generating reports, specifically including:

[0087] During the test, the temperature, vibration, pressure, humidity and other relevant data collected by each module are automatically stored in the central database after being processed by the data feedback diagnosis module;

[0088] The data storage adopts time series recording and segmented archiving technology to ensure that the data of each test stage are completely preserved and facilitate subsequent comparative analysis;

[0089] After the test is completed, the system automatically generates a test report and records the temperature curve, the change trends of various parameters and the abnormal warning records during the test process;

[0090] Finally, according to the preset algorithm, statistical and trend analysis are performed on the test data, and detailed technical indicators and fault analysis conclusions are output, providing data basis for optimizing subsequent test plans and improving equipment, and enhancing the transparency and traceability of the overall test.

[0091] The control method of the precision constant temperature test chamber further includes steps of automatic connection between the preheating and temperature stabilization stages, specifically including:

[0092] Before the test is started, the system first enters the preheating stage, and the temperature of the test chamber is slowly raised to the preset initial temperature at a low rate through the temperature control module;

[0093] After the preheating stage is completed, the system automatically detects whether the temperatures of each measuring point in the test chamber reach the preset equilibrium value. If so, it automatically switches to the temperature stabilization stage and keeps the temperature within the set range;

[0094] During the temperature stabilization stage, the temperature control module continuously monitors the temperature fluctuation, and uses the PID regulation and linkage control module to coordinate and adjust the test process to ensure that the temperature in the test chamber is always in a stable state; the seamless connection between the preheating and temperature stabilization stages ensures the continuity of test data and the stability of the test environment, provides a good environment for the smooth progress of subsequent test items, and reduces the thermal stress problem caused by temperature fluctuation.

[0095] This application realizes the deep integration of temperature control and test process automation by introducing multi-module linkage control technology. In terms of temperature regulation, it adopts a segmented heating (or cooling) strategy and PID closed-loop control, which can accurately control the temperature change rate and effectively avoid the problem of thermal stress concentration caused by excessive temperature difference, thereby prolonging the service life of electronic components; in terms of the test process, through PLC automatic control and remote monitoring, seamless switching and real-time adjustment between test items are realized, significantly reducing the human operation error and improving the test efficiency and data accuracy.

[0096] In addition, in this application, by establishing a mathematical model and a feedback algorithm between temperature and test procedures, multiple closed-loop regulations of temperature control, process, and data feedback are achieved. When temperature anomalies or mismatched test steps are detected, the system can respond quickly, automatically adjust the operating states of each module, and ensure that the overall system is always in a safe and stable operating state. This not only improves the overall reliability of the test but also provides more persuasive data support for the subsequent reliability assessment of electronic products.

[0097] Example 1:

[0098] In the environmental adaptability test of electronic products, the target temperature set for the test chamber is 80°C. The operator inputs the following parameters through the control interface:

[0099] Target temperature in the preheating temperature rise stage: 50°C;

[0100] Target temperature in the high-speed temperature rise stage: 80°C;

[0101] The temperature control coefficients K1 and K2 are set to 0.5 and 1.2 respectively;

[0102] The start time of the vibration test is set when the temperature reaches 55°C;

[0103] Fault warning threshold: temperature fluctuation exceeds ±2°C, and vibration deviation exceeds the preset range;

[0104] After the test is started, the temperature control module first raises the temperature from room temperature (about 25°C) to 50°C at a low rate. When the temperature reaches 50°C, the linkage coordination module, according to the formula T a = T t + K1·(Δt) + K2·f(step,δ), detects the current temperature and the state that the vibration item in the test process has not been started, issues a linkage command, and pauses some non-critical loads. Subsequently, the test process automation module starts the vibration test, and at the same time, the temperature control module enters the high-speed temperature rise stage, raising the temperature from 50°C to 80°C. Throughout the process, the data feedback diagnosis module monitors the temperature and vibration data in real time. Once local temperature anomalies are detected, it immediately starts the standby cooling program through the linkage coordination module and pauses the vibration test, and automatically resumes after the temperature stabilizes. Finally, all data in the test chamber are within the expected range, the entire test is successfully completed, and the test report data is accurate and highly repeatable.

[0105] Example 2:

[0106] For the thermal stress test of electronic components, the target temperature in the test chamber is set to cycle between -20°C and 120°C. The operator pre-sets the temperature cycle curve, the residence time at each stage, and test parameters such as vibration and pressure. After the system is started, the temperature control module automatically determines whether to adopt a low-speed or high-speed temperature change scheme based on the difference between the current temperature and the target temperature; the linkage coordination module compares the temperature change information with the test process parameters in real time. Once it is found that the temperature difference does not match the test stage, an adjustment instruction is immediately issued. The data feedback diagnosis module analyzes each parameter through a fuzzy logic algorithm. When abnormal temperature fluctuations are detected, it automatically starts the compensation algorithm and records the relevant data to ensure that the thermal stress of the electronic components is always within the controllable range during the entire temperature cycle process. Through the linkage of mechanized judgment and automated processes, the problem of thermal stress concentration is effectively alleviated during the entire temperature cycle test process, and at the same time, the test efficiency and data reliability are significantly improved.

[0107] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0108] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0109] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0110] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit of the present invention and the scope protected by the claims. All of these fall within the protection scope of the present invention.

Claims

1. A control method for a precision constant temperature test chamber, which operates using the control system of the precision constant temperature test chamber, including a temperature control module, a test process automation module, a linkage coordination module, and a data feedback diagnosis module, characterized in that: The control method of the precision constant temperature test chamber includes the following steps: The temperature data inside the test chamber is detected in real time by a temperature sensor and transmitted to the temperature control module; According to the preset target temperature and the current temperature data, a segmented temperature rise or fall strategy is adopted to achieve automatic switching between low-speed and high-speed temperature changes; During the temperature change process, the current test process parameters are detected by a judgment module, and a parameter linkage formula between temperature and test steps is established to perform linkage adjustment on the temperature control parameters; The test process automation module automatically executes each test step according to the preset test item sequence and is linked with the temperature control module; The data feedback diagnosis module collects temperature, vibration, and pressure data in real time and performs anomaly judgment through a fuzzy logic algorithm to automatically send out a warning signal; When an anomaly occurs in the temperature or test process, the linkage coordination module automatically sends out an adjustment instruction to control the synchronous adjustment of the temperature control module and the test process automation module until normal operation is restored.

2. The control method of a precision constant temperature test chamber according to claim 1, characterized in that: The temperature control module is used to precisely control the temperature inside the test chamber, and the specific operation steps are as follows: In the initial stage, the temperature data inside the test chamber is monitored in real time by a temperature sensing device; According to the difference between the preset target temperature and the current temperature, it is judged whether segmented control is required; Before the temperature approaches the target temperature, heating or cooling is carried out at a lower rate. When the temperature reaches the preset critical value, it automatically switches to a faster rate for the final adjustment; During the temperature control process, the risk of concentrated thermal stress is dispersed by using buffer material design, and the buffer materials include silica gel pads and graphite sheets.

3. The control method of a precision constant temperature test chamber according to claim 1, wherein: The test process automation module uses a PLC as the core control unit to achieve automatic switching and linkage control of multiple test items through a preset program, specifically including: After the test starts, the PLC controller first reads the real-time data transmitted back by the temperature control module and compares it with the preset test process parameters; When the temperature data is within the safe range, the PLC sequentially starts the corresponding test items and achieves seamless switching between each item; During the test process, if it is detected that the temperature or other key parameters exceed the preset tolerance, the PLC automatically executes the shutdown protection program and sends an abnormal state signal to the linkage coordination module at the same time.

4. The control method of a precision constant temperature test chamber according to claim 1, characterized in that: The linkage control module realizes multi-parameter comprehensive adjustment by establishing a linkage formula between temperature and test process. The main functions of this module are as follows: Establish a parameter linkage formula between temperature and test steps, and its algorithm expression is as follows: T a = T t + K1·(Δt) + K2·f(step,δ); where T a represents the actual temperature, T t represents the target temperature, Δt is the temperature change time interval, K1 and K2 are both system adjustment coefficients, and f(step,δ) is a function of the current test step and the error factor; After the test process starts, the linkage coordination module cross-judges the temperature data and process data in real time. When it is found that the temperature change does not match the test steps or exceeds the preset tolerance, the warning mechanism is immediately started, the temperature change rate is automatically adjusted, and the next test link is paused to ensure the stable operation of the overall test process.

5. The control method of a precision constant temperature test chamber according to claim 1, characterized in that: The data feedback diagnosis module is used to collect, analyze and give fault warnings for the data during the test process. The specific measures are as follows: An independent data acquisition unit is installed in each module to record temperature, pressure, vibration, and electronic signal parameters in real time; Identify potential abnormal states through a fuzzy logic algorithm and send out fault warnings in the first time; The data feedback diagnosis module also includes a function of late-stage data storage and comparison, which is convenient for analyzing the internal relationship between temperature changes and various parameters in the test process, and provides data support for subsequent improvements; The linkage feedback mechanism enables the test chamber to automatically adjust, reducing the overall machine failure caused by local parameter abnormalities.

6. The control method of a precision constant temperature test chamber according to claim 2, characterized in that: The temperature control module adopts an advanced PID controller and combines the temperature sensor data for closed-loop regulation. Its specific implementation includes: Real-time acquisition of temperature data at different positions inside the test chamber through a high-precision temperature sensor and transmission of the data to the central controller; The central controller calculates in real time using the PID formula according to the set target temperature and temperature change curve to calculate the output power required for heating or cooling; where U(t) is the control output, and e(t) = T t - T c is the temperature error, and K p , K i , and K d are the proportional, integral, and differential coefficients respectively, T t is the target temperature, and T c is the current temperature; Feedback of the operation result to the temperature control actuator to achieve precise control of the heater or cooling system; When the temperature approaches the preset critical value, the system automatically adjusts the PID parameters to ensure the minimum temperature fluctuation during the temperature rise or fall process. At the same time, through multi-point temperature data comparison, it ensures uniform distribution of the overall temperature inside the test chamber, thereby achieving a precise constant temperature effect.

7. The control method of a precision constant temperature test chamber according to claim 1, wherein: The temperature control module, the test process automation module, the linkage coordination module, and the data feedback diagnosis module are all interconnected and communicate through an internal digital bus. The specific implementation method is: Each module is equipped with an independent digital signal processing unit, and temperature, time, and process status parameters are transmitted in real time through the internal bus; The bus system is designed with redundant lines and an error detection mechanism, which can automatically switch to the standby line when a single path fails, ensuring the continuity and reliability of data transmission; After receiving the data from each module, the linkage coordination module performs multi-parameter coordinated adjustment according to the preset linkage formula and feeds it back to each module through the digital bus to adjust their respective operation states in real time.

8. A control method for a precision constant temperature test chamber according to any one of claims 1-7, characterized in that: The control method of the precision constant temperature test chamber further includes steps of test data storage and report generation, specifically including: During the test process, the temperature, vibration, pressure, humidity, and other relevant data collected by each module are automatically stored in the central database after being processed by the data feedback diagnosis module; The data storage adopts time-series recording and segmented archiving technologies to ensure the complete preservation of data in each test stage and facilitate subsequent comparative analysis; After the test is completed, the system automatically generates a test report and records the temperature curve, the change trend of various parameters, and the abnormal warning record during the test process; Finally, statistical and trend analysis of the test data is performed according to the preset algorithm, and detailed technical indicators and fault analysis conclusions are output, providing data basis for subsequent test plan optimization and equipment improvement, and enhancing the transparency and traceability of the overall test.

9. The control method of a precision constant temperature test chamber according to claim 1, characterized in that: The control method of the precision constant temperature test chamber also includes an automatic connection step for the preheating and temperature stabilization stages, specifically including: Before the test starts, the system first enters the preheating stage, and slowly raises the temperature of the test chamber to the preset initial temperature at a low rate through the temperature control module; After the preheating stage ends, the system automatically detects whether the temperature of each measuring point inside the test chamber reaches the preset equilibrium value. If it reaches, it automatically switches to the temperature stabilization stage and maintains the temperature within the set range; During the temperature stabilization stage, the temperature control module continuously monitors the temperature fluctuation and uses the PID regulation and linkage control module to coordinate and adjust the test process to ensure that the temperature inside the test chamber is always in a stable state.

Images