Temperature control method and environmental testing system

Abstract

The embodiments of the present application provide a temperature control method and an environmental testing system, including obtaining a target temperature, controlling the duty cycle of a first flow solenoid valve according to the target temperature and a first test temperature, controlling the duty cycle of a second flow solenoid valve according to the target temperature and a second test temperature, obtaining a target flow interval, and controlling the output power of a temperature control module according to the target flow interval and the flow rate of a temperature control medium. By adjusting the duty cycle of the first flow solenoid valve, fluctuations in the first test temperature caused by environmental disturbances or changes in the temperature of a heat transfer medium can be absorbed, and the output power of the temperature control module can be adjusted accordingly to respond to actual test conditions, thereby improving the temperature control accuracy of the environmental testing system.

Description

Technical Field

[0001] The present application relates to the field of temperature detection technology, and specifically, to a temperature control method and an environmental testing system. Background Art

[0002] An environmental testing system is used to provide the temperature field environment required for the pressure sensor to be tested. A related technology, the environmental testing system includes a test temperature box, in which a test cavity and a temperature control module are arranged. During the test, the temperature control module heats or cools the test cavity. By adjusting the output power of the temperature control module, the temperature of the temperature field in the test cavity can be adjusted to reach the target temperature. In this related technology, the test cavity and the temperature control module are integrated together. On the one hand, each test cavity needs to be equipped with a set of temperature control modules, and the cost is high for batch use. On the other hand, when replacing the instrument to be tested, it is necessary to completely release the heating or cooling capacity of the temperature control module, and then restart the temperature control from the ambient temperature. The energy consumption of the environmental testing system is large and the test efficiency is low.

[0003] In view of the above situation, an improved related technology is provided, in which the environmental testing system includes a liquid storage tank, a temperature control module and a test temperature chamber, wherein the test temperature chamber integrates a test cavity, a heat transfer module and a flow control valve. During the test, the target temperature of the liquid tank is preset according to the target temperature of the temperature chamber, and the temperature control module heats or cools the liquid storage tank in the liquid storage tank to reach the target temperature of the liquid tank. The heat transfer medium flows through the heat transfer module and performs heat exchange with the test cavity through the heat transfer module to adjust the temperature in the test cavity. Compared with the previous related technology, the improved related technology can provide heat transfer medium for one or more test temperature chambers by a set of liquid storage tanks and temperature control modules, thereby reducing the testing cost of the test temperature chambers when used in batches. When replacing the instrument to be tested, the heat transfer medium in the liquid storage tank can be maintained at the target temperature of the liquid tank. After the new instrument to be tested is placed, the liquid storage tank can provide heat transfer medium according to the target temperature of the liquid tank, which not only reduces the energy consumption of the system, but also saves temperature control time and improves test efficiency.

[0004] However, the above-mentioned improved related technologies have the following technical problems: due to different actual test conditions, the preset liquid tank target temperature may be too high or too low, and accordingly, the temperature of the heat transfer module may also be too high or too low, resulting in a deviation between the test temperature and the target temperature of the incubator, thereby reducing the temperature control accuracy of the environmental test system; if the temperature control module is controlled according to the test temperature, due to the long heat transfer path between the temperature control module and the test cavity, it is difficult for the temperature control module to respond to the test temperature in a timely manner, and it may also increase the temperature fluctuation of the test cavity, thereby reducing the temperature control accuracy of the environmental test system. Summary of the invention

[0005] The invention provides a temperature control method and an environmental testing system, which can improve the temperature control accuracy of the environmental testing system.

[0006] A first aspect of an embodiment of the present application provides a temperature control method, which is applied to an environmental testing system. The environmental testing system includes a liquid storage tank, a temperature control module, a first test temperature box and at least one second test temperature box. The liquid storage tank is used to accommodate a heat transfer medium. The temperature control module is used to heat or cool the heat transfer medium in the liquid storage tank. The first test temperature box includes a first test cavity, a first heat transfer module and a first flow solenoid valve. The first test cavity is used to accommodate a first instrument to be tested. The first heat transfer module is used to perform heat exchange with the first test cavity to adjust the temperature in the first test cavity. The first flow solenoid valve is used to control the flow of heat transfer medium between the liquid storage tank and the first heat transfer module. The second test temperature box includes a second test cavity, a second heat transfer module and a second flow solenoid valve. The second test cavity is used to accommodate a second instrument to be tested. The second heat transfer module is used to perform heat exchange with the second test cavity to adjust the temperature in the second test cavity. The second flow solenoid valve is used to control the flow of heat transfer medium between the liquid storage tank and the second heat transfer module. The temperature control The control method includes: obtaining a target temperature; periodically obtaining a first test temperature, and controlling a duty cycle of a first flow solenoid valve according to the target temperature and the first test temperature, so that the first test temperature approaches or reaches the target temperature, wherein the first test temperature is used to indicate the temperature of a first test cavity; periodically obtaining a second test temperature, and controlling a duty cycle of a second flow solenoid valve according to the target temperature and the second test temperature, so that the second test temperature approaches or reaches the target temperature, wherein the second test temperature is used to indicate the temperature of a second test cavity; obtaining a target flow interval; periodically obtaining a temperature control medium flow, and controlling an output power of a temperature control module according to the target flow interval and the temperature control medium flow, wherein the temperature control medium flow rate is used to indicate the sum of a heat transfer medium flow flowing into the first heat transfer module and a heat transfer medium flow flowing into the second heat transfer module, and if the temperature control medium flow is less than a lower limit of the target flow interval, the output power of the temperature control module is reduced, and if the temperature control medium flow is greater than an upper limit of the target flow interval, the output power of the temperature control module is increased.

[0007] The embodiment of the present application provides a temperature control method for an environmental test system, which controls the duty cycle of a first flow solenoid valve according to a target temperature and a first test temperature, and controls the duty cycle of a second flow solenoid valve according to a target temperature and a second test temperature. Based on the positive correlation between the duty cycle of the first flow solenoid valve, the duty cycle of the second flow solenoid valve, and the flow rate of a temperature-controlled medium, the flow rate of the temperature-controlled medium is periodically obtained, and the output power of a temperature control module is controlled according to a target flow interval and the flow rate of the temperature-controlled medium. By adjusting the duty cycle of the first flow solenoid valve, fluctuations in the first test temperature caused by environmental disturbances or changes in the temperature of the heat transfer medium can be absorbed. By adjusting the duty cycle of the second flow solenoid valve, the second test temperature fluctuation caused by environmental disturbances or changes in the temperature of the heat transfer medium can be absorbed, and the deviation between the output power of the temperature control module and the actual test conditions can be judged by the temperature control medium flow and the target flow range. If the temperature control medium flow is less than the lower limit of the target flow range, or if the temperature control medium flow is greater than the upper limit of the target flow range, the output power of the temperature control module can be adjusted accordingly to respond to the actual test conditions, reducing the situation where the heat transfer medium temperature is too high or too low, thereby improving the temperature control accuracy of the environmental test system, and then improving the test accuracy of the instrument to be tested.

[0008] In some examples of the first aspect of the embodiments of the present application, the environmental testing system also includes a medium pump and a liquid return tank, the input end of the medium pump is connected to the output end of the liquid storage tank, the output end of the medium pump is connected to the input end of the first flow solenoid valve, the input end of the second flow solenoid valve and the input end of the liquid return tank, and the medium pump is used to drive the heat transfer medium from the input end of the medium pump to the output end of the medium pump; the temperature control method also includes: the output power of the medium pump is configured to be adjustable; the target duty cycle interval is obtained; according to the duty cycle of the first flow solenoid valve and the target duty cycle interval, the output power of the medium pump is periodically controlled, wherein if the duty cycle of the first flow solenoid valve is greater than the upper limit of the target duty cycle interval, the output power of the medium pump is increased, and if the duty cycle of the first flow solenoid valve is less than the lower limit of the target duty cycle interval, the output power of the medium pump is reduced; the control period of the medium pump is greater than the control period of the first flow solenoid valve.

[0009] In some examples of the first aspect of the embodiments of the present application, the temperature control medium flow is periodically obtained, including: determining the temperature control medium flow according to the output power of the medium pump, the duty cycle of the first flow solenoid valve and the duty cycle of the second flow solenoid valve.

[0010] In some examples of the first aspect of the embodiments of the present application, obtaining a target duty cycle interval includes: if the duty cycle of a first flow solenoid valve is greater than an upper limit of the target duty cycle interval, and the duty cycle of at least one second flow solenoid valve is less than a lower limit of the target duty cycle interval, then increasing the upper limit of the target duty cycle interval; if the duty cycle of the first flow solenoid valve is less than the lower limit of the target duty cycle interval, and the duty cycle of at least one second flow solenoid valve is greater than the upper limit of the target duty cycle interval, then lowering the lower limit of the target duty cycle interval; the initial upper limit of the target duty cycle interval is less than or equal to 0.6, and the initial lower limit of the target duty cycle interval is greater than or equal to 0.4.

[0011] In some examples of the first aspect of the embodiments of the present application, the temperature control method also includes: if the duty cycle of the first flow solenoid valve is greater than 0.8, and the duty cycle of at least one second flow solenoid valve is less than the lower limit of the target duty cycle range, then the output power of the temperature control module is reduced, the duty cycle of the first flow solenoid valve is controlled to be zero, and an early warning message is issued; if the duty cycle of the first flow solenoid valve is less than 0.2, and the duty cycle of at least one second flow solenoid valve is greater than the upper limit of the target duty cycle range, then the output power of the temperature control module is reduced, the duty cycles of the first flow solenoid valve and the second flow solenoid valve are controlled to be zero, and an early warning message is issued.

[0012] In some examples of the first aspect of the embodiments of the present application, the environmental testing system also includes a medium pump and a liquid return tank, the input end of the medium pump is connected to the output end of the liquid storage tank, the output end of the medium pump is connected to the input end of the first flow solenoid valve, the input end of the second flow solenoid valve and the input end of the liquid return tank, and the medium pump is used to drive the heat transfer medium to flow from the input end of the medium pump to the output end of the medium pump; the temperature control method also includes: the output power of the medium pump is configured to be fixed; obtaining a target flow range, including obtaining a target duty cycle range, determining the target flow range according to the target duty cycle range, the upper limit of the target duty cycle range is less than or equal to 0.7, and the lower limit of the target duty cycle range is greater than or equal to 0.3; periodically obtaining the temperature control medium flow, including determining the temperature control medium flow according to the duty cycle of the first flow solenoid valve and the duty cycle of the second flow solenoid valve.

[0013] In some examples of the first aspect of the embodiments of the present application, the temperature control method also includes: obtaining a warning temperature; periodically obtaining the medium temperature in the tank, the medium temperature in the tank being used to indicate the temperature of the heat transfer medium in the liquid storage tank; if the medium temperature in the tank reaches the warning temperature, reducing the output power of the temperature control module, controlling the duty cycle of the first flow solenoid valve to zero, and issuing a warning message.

[0014] In some examples of the first aspect of the embodiments of the present application, the control period of the temperature control module is greater than the control period of the first flow solenoid valve, the first time interval is determined according to the flow path of the heat transfer medium between the liquid storage tank and the first heat transfer module, and the control period of the temperature control module is greater than the first time interval; the control period of the temperature control module is greater than the control period of the second flow solenoid valve, the second time interval is determined according to the flow path of the heat transfer medium between the liquid storage tank and the second heat transfer module, and the control period of the temperature control module is greater than the second time interval.

[0015] In some examples of the first aspect of the embodiments of the present application, the first test temperature is periodically obtained, and the duty cycle of the first flow solenoid valve is controlled according to the target temperature and the first test temperature so that the first test temperature approaches or reaches the target temperature, including: the target temperature is higher than the ambient reference temperature, if the first test temperature at the current moment is higher than the target temperature, the duty cycle of the first flow solenoid valve is reduced, if the first test temperature at the current moment is equal to the target temperature, the duty cycle of the first flow solenoid valve is kept unchanged, if the first test temperature at the current moment is lower than the target temperature, the duty cycle of the first flow solenoid valve is increased.

[0016] In some examples of the first aspect of the embodiments of the present application, the first test temperature is periodically obtained, and the duty cycle of the first flow solenoid valve is controlled according to the target temperature and the first test temperature so that the first test temperature approaches or reaches the target temperature, including: the target temperature is lower than the ambient reference temperature, if the first test temperature at the current moment is higher than the target temperature, the duty cycle of the first flow solenoid valve is increased, if the first test temperature at the current moment is equal to the target temperature, the duty cycle of the first flow solenoid valve is kept unchanged, if the first test temperature at the current moment is lower than the target temperature, the duty cycle of the first flow solenoid valve is reduced.

[0017] In some examples of the first aspect of the embodiments of the present application, a first test temperature is periodically obtained, and the duty cycle of the first flow solenoid valve is controlled according to the target temperature and the first test temperature so that the first test temperature approaches or reaches the target temperature, including: at the last control moment of the first flow solenoid valve, the expected temperature after adjustment is determined according to the duty cycle of the adjusted first flow solenoid valve and the change trend of the first test temperature, and the expected temperature after adjustment represents the expected value of the first test temperature at the current moment; the target temperature is higher than the ambient reference temperature, if the first test temperature at the current moment is higher than the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is reduced, if the first test temperature at the current moment is equal to the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is kept unchanged, if the first test temperature at the current moment is lower than the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is increased.

[0018] In some examples of the first aspect of the embodiments of the present application, a first test temperature is periodically obtained, and the duty cycle of the first flow solenoid valve is controlled according to the target temperature and the first test temperature so that the first test temperature approaches or reaches the target temperature, including: at the last control moment of the first flow solenoid valve, the expected temperature after adjustment is determined according to the duty cycle of the adjusted first flow solenoid valve and the change trend of the first test temperature, and the expected temperature after adjustment represents the expected value of the first test temperature at the current moment; if the target temperature is lower than the ambient reference temperature, if the first test temperature at the current moment is higher than the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is increased; if the first test temperature at the current moment is equal to the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is kept unchanged; if the first test temperature at the current moment is lower than the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is reduced.

[0019] In some examples of the first aspect of the embodiments of the present application, a first test temperature is periodically obtained, and the duty cycle of the first flow solenoid valve is controlled according to the target temperature and the first test temperature so that the first test temperature approaches or reaches the target temperature, including: determining the expected temperature before adjustment according to the change trend of the first test temperature, and the expected temperature before adjustment represents the expected value of the first test temperature at the next control moment of the flow solenoid valve; the target temperature is higher than the ambient reference temperature, if the expected temperature before adjustment is higher than the target temperature, then reducing the duty cycle of the first flow solenoid valve, if the expected temperature before adjustment is equal to the target temperature, then keeping the duty cycle of the first flow solenoid valve unchanged, if the expected temperature before adjustment is lower than the target temperature, then increasing the duty cycle of the first flow solenoid valve.

[0020] In some examples of the first aspect of the embodiments of the present application, a first test temperature is periodically obtained, and the duty cycle of the first flow solenoid valve is controlled according to the target temperature and the first test temperature so that the first test temperature approaches or reaches the target temperature, including: determining the expected temperature before adjustment according to the change trend of the first test temperature, and the expected temperature before adjustment represents the expected value of the first test temperature at the next control moment of the flow solenoid valve; if the target temperature is lower than the ambient reference temperature, if the expected temperature before adjustment is higher than the target temperature, then the duty cycle of the first flow solenoid valve is increased; if the expected temperature before adjustment is equal to the target temperature, then the duty cycle of the first flow solenoid valve is kept unchanged; if the expected temperature before adjustment is lower than the target temperature, then the duty cycle of the first flow solenoid valve is reduced.

[0021] The second aspect of the embodiment of the present application provides an environmental testing system, including: a liquid storage tank for accommodating a heat transfer medium; a temperature control module for heating or cooling the heat transfer medium in the liquid storage tank; a first test temperature box for testing a first instrument to be tested, the first test temperature box including a first test cavity, a first heat transfer module and a first flow solenoid valve, the first test cavity for accommodating the first instrument to be tested, the first heat transfer module for performing heat exchange with the first test cavity to adjust the temperature in the first test cavity, and the first flow solenoid valve for controlling the flow of the heat transfer medium between the liquid storage tank and the first heat transfer module; at least one second test temperature box for Testing the second instrument to be tested, the second test temperature box includes a second test cavity, a second heat transfer module and a second flow solenoid valve, the second test cavity is used to accommodate the second instrument to be tested, the second heat transfer module is used to perform heat exchange with the second test cavity to adjust the temperature in the second test cavity, and the second flow solenoid valve is used to control the flow of heat transfer medium between the liquid storage tank and the second heat transfer module; a control module, the control module is coupled with the temperature control module, the first flow solenoid valve and the second flow solenoid valve, the control module is used to execute pre-stored computer programs or instructions, so that the environmental testing system executes the temperature control method as in the first aspect of the embodiment of the present application and in its examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the piping connection of an environmental testing system according to one example of an embodiment of the present application.

[0023] Figure 2 This is a schematic diagram of the pipeline connections of the environmental testing system of Example 2 of the embodiment of the present application.

[0024] Figure 3 This is a schematic diagram of the pipeline connections of the environmental testing system of Example 3 of the embodiment of the present application.

[0025] Figure 4 A connection diagram of an exemplary environmental testing system according to an embodiment of the present application.

[0026] Figure 5 This is a schematic diagram of the piping connection of the environmental testing system of Example 4 of the embodiment of the present application.

[0027] Figure 6 This is a flow chart of a temperature control method according to one example of an embodiment of the present application. DETAILED DESCRIPTION

[0028] In the embodiment of the present application, the heat transfer medium can be liquid throughout the process, or liquid in part of the process and gaseous in part of the process. The embodiment of the present application provides a temperature control method, which is applied to an environmental testing system, which is used to provide the temperature field environment required for the test for the instrument to be tested during the test process. The instrument to be tested in the embodiment of the present application can be a temperature meter, or it can be an industrial instrument such as a pressure meter, flow meter, electric measuring meter, etc. that has a demand for test temperature during the test process. The instrument to be tested in the embodiment of the present application can include sensors, switch-type instruments, safety valves, transmitters, etc.

[0029] like Figures 1 to 5 As shown, the environmental testing system in the embodiment of the present application includes a liquid storage tank 310 , a temperature control module 400 , a first testing temperature box 100 and at least one second testing temperature box 200 .

[0030] The liquid storage tank 310 is used to contain the heat transfer medium. The inner side of the liquid storage tank 310 forms a groove cavity, and the heat transfer medium is contained in the groove cavity of the liquid storage tank 310. The groove of the liquid storage tank 310 can be closed or semi-closed. An insulation layer can be provided in the liquid storage tank 310, and the insulation layer wraps the groove cavity, thereby reducing the heat exchange between the heat transfer medium and the external environment and improving the stability of the heat transfer medium in the liquid storage tank 310. In some cases, a stirring mechanism can be provided in the liquid storage tank 310, and the stirring mechanism is provided in the groove cavity. The stirring mechanism is used to stir the heat transfer medium in the groove cavity. Stirring is performed to improve the temperature uniformity of the heat transfer medium in the liquid storage tank 310. The liquid storage tank 310 may include an output end and an input end, wherein the heat transfer medium can flow out from the output end of the liquid storage tank 310, and the heat transfer medium can flow into the input end of the liquid storage tank 310. In some cases, if at least two liquid storage tanks 310 are allowed to be combined, a stop valve is set at the input end of the liquid storage tank 310 to control the opening and closing of the input end of the liquid storage tank 310, and a stop valve is set at the output end of the liquid storage tank 310 to control the opening and closing of the output end of the liquid storage tank 310.

[0031] The temperature control module 400 is used to heat or cool the heat transfer medium in the liquid storage tank 310. Specifically, according to the different uses of the environmental testing system, the temperature control module 400 may include at least one heating body. If so, the temperature control module 400 can heat the heat transfer medium in the liquid storage tank 310 so that the temperature of the heat transfer medium in the liquid storage tank 310 is higher than the ambient temperature. The temperature control module 400 may also include at least one cooling body. If so, the temperature control module 400 can cool the heat transfer medium in the liquid storage tank 310 so that the temperature of the heat transfer medium in the liquid storage tank 310 is lower than the ambient temperature. The temperature control module 400 may also include a combination of at least one heating body and at least one cooling body. In this way, the environmental testing system may include a heating mode and a cooling mode. In the heating mode, the temperature control module 400 can heat the heat transfer medium in the liquid storage tank 310 so that the temperature of the heat transfer medium in the liquid storage tank 310 is higher than the ambient temperature. In the cooling mode, the temperature control module 400 can cool the heat transfer medium in the liquid storage tank 310 so that the temperature of the heat transfer medium in the liquid storage tank 310 is lower than the ambient temperature. If the temperature control module 400 includes at least two heating bodies, or at least two cooling bodies, or at least one heating body and at least one cooling body, different heating bodies, different cooling bodies, and heating bodies and cooling bodies can work in coordination with each other, or they can work independently according to actual test conditions.

[0032] In some examples of the embodiments of the present application, Figure 2 As shown, the temperature control module 400 may include a first heating body 410; the first heating body 410 may be one or a combination of electromagnetic heaters, infrared heaters, resistance heaters, etc. The first heating body 410 is disposed in the liquid storage tank 310. In some cases, all or part of the first heating body 410 may also be disposed on the outer wall of the liquid storage tank 310; during the test, the first heating body 410 is started to heat the heat transfer medium in the liquid storage tank 310, so that the temperature of the heat transfer medium in the liquid storage tank 310 rises to a temperature higher than the ambient temperature. The temperature of the heat transfer medium in the liquid storage tank 310 can be adjusted by adjusting the heating power of the first heating body 410. If the heating power of the first heating body 410 is greater than the heat release rate of the liquid storage tank 310 (the amount of heat released per unit time), the temperature of the heat transfer medium in the liquid storage tank 310 rises. If the heating power of the first heating body 410 is less than the heat release rate of the liquid storage tank 310, the temperature of the heat transfer medium in the liquid storage tank 310 decreases. If the heating power of the first heating body 410 is equal to the heat release rate of the liquid storage tank 310, the temperature of the heat transfer medium in the liquid storage tank 310 remains unchanged.

[0033] In some examples of the embodiments of the present application, Figure 2As shown, the temperature control module 400 may include a second heating body 420; the first heating body 410 may be one or a combination of electromagnetic heaters, infrared heaters, resistance heaters, etc., and all or part of the second heating body 420 may also be arranged on the outer wall of the liquid storage tank 310; during the test, the second heating body 420 is started, and it begins to heat the heat transfer medium in the liquid storage tank 310, so that the temperature of the heat transfer medium in the liquid storage tank 310 rises to higher than the ambient temperature. The heating power of the second heating body 420 can be adjusted to adjust the temperature of the heat transfer medium in the liquid storage tank 310. If the second heating body 420 is If the heating power of the first heating body 420 is greater than the heat release rate of the liquid storage tank 310 (heat release per unit time), the temperature of the heat transfer medium in the liquid storage tank 310 rises; if the heating power of the second heating body 420 is less than the heat release rate of the liquid storage tank 310, the temperature of the heat transfer medium in the liquid storage tank 310 decreases; if the heating power of the second heating body 420 is equal to the heat release rate of the liquid storage tank 310, the temperature of the heat transfer medium in the liquid storage tank 310 remains unchanged; it can be understood that the first heating body 410 and the second heating body 420 can be controlled in coordination with each other to adjust the temperature of the heat transfer medium in the liquid storage tank 310.

[0034] In some examples of the embodiments of the present application, Figure 3 As shown, the temperature control module 400 may include a first heating body 410, a refrigeration coil 430 and a refrigeration unit 440; the first heating body 410 may be one or a combination of electromagnetic heaters, infrared heaters, resistance heaters and the like, the first heating body 410 is disposed in the liquid storage tank 310, and in some cases, all or part of the first heating body 410 may also be disposed on the outer wall of the liquid storage tank 310; the refrigeration coil 430 is disposed on the outer wall of the liquid storage tank 310, and in some cases, all or part of the refrigeration coil 430 may also be disposed in the liquid storage tank 310, and the refrigeration unit 440 may include a compressor, a condenser, an expansion valve / throttle and the like, The output end of the refrigeration coil 430 is connected to the input end of the refrigeration unit 440 (for example, the input end of the compressor). After the refrigerant exchanges heat with the liquid storage tank 310 in the refrigeration coil 430, it becomes a high-temperature gas. After the compression process of the compressor, the condensation process of the condenser, and the expansion process of the expansion valve / throttle, it is converted into a low-temperature and low-pressure liquid. The output end of the refrigeration unit 440 (for example, the output end of the expansion valve / throttle) is connected to the input end of the refrigeration coil 430, and the low-temperature and low-pressure liquid refrigerant enters the refrigeration coil 430 for refrigeration. In some cases, the refrigeration unit 440 can also be other components, such as air cooling, Peltier cooling, or a combination of several refrigeration methods.

[0035] In some examples of the embodiments of the present application, Figure 5As shown, the temperature control module 400 may include a Peltier module 450, the inner side of the Peltier module 450 is arranged on the outer side wall of the liquid storage tank 310, and in some cases, a heat sink, a radiator or other heat dissipation structure may also be arranged on the outer side of the Peltier module 450; during the test process, when the Peltier module 450 is energized in the cooling direction, the Peltier module 450 can be used as a cooling body to cool the heat transfer medium in the liquid storage tank 310, and when the Peltier module 450 is energized in the heating direction (the heating direction is opposite to the current direction corresponding to the cooling direction), the Peltier module 450 can be used as a heating body to heat the heat transfer medium in the liquid storage tank 310, and the power supplied to the Peltier module 450 can be adjusted to adjust the output power of the Peltier module 450, thereby controlling the temperature of the heat transfer medium in the liquid storage tank 310, for example, making the temperature of the heat transfer medium in the liquid storage tank 310 rise, fall or remain unchanged. It is understandable that the temperature control module 400 may also have other implementation forms, and the above examples may be combined with each other in whole or in part. In general, the temperature control module 400 can heat the heat transfer medium in the liquid storage tank, and can also cool the heat transfer medium in the liquid storage tank. The temperature control module 400 may have one of the heating function and the cooling function, or may have both the heating function and the cooling function, and perform heating or cooling according to actual test conditions. The output power of the temperature control module 400 affects the temperature of the heat transfer medium in the liquid storage tank. By controlling the output power of the temperature control module 400, the temperature of the heat transfer medium in the liquid storage tank can be adjusted, and the direction of adjustment may be that the temperature of the heat transfer medium increases, decreases, or remains unchanged.

[0036] The first test incubator 100 is used to test the first instrument to be tested, and includes a first test chamber 110, a first heat transfer module 120 and a first flow solenoid valve 130. The first test chamber 110 is used to accommodate the first instrument to be tested, the first heat transfer module 120 is used to perform heat exchange with the first test chamber 110 to adjust the temperature in the first test chamber 110, and the first flow solenoid valve 130 is used to control the flow of heat transfer medium between the liquid storage tank 310 and the first heat transfer module 120. The first test incubator 100 may include a heat preservation layer, which at least partially wraps the first test chamber 110 to reduce the heat exchange between the first test chamber 110 and the external environment, and improve the temperature stability in the first test chamber 110. The first heat transfer module 120 is connected to the first test cavity 110 by heat transfer; in some cases, the first heat transfer module 120 is entirely or partially disposed outside the first test cavity 110, and the first heat transfer module 120 is in contact with the outside of the first test cavity 110, or the first heat transfer module 120 is connected to the outside of the first test cavity 110 through a structure with good thermal conductivity. In some cases, the first heat transfer module 120 is entirely or partially disposed inside the first test cavity 110; a pipeline or cavity through which a heat transfer medium can flow is provided in the first heat transfer module 120, and the first heat transfer module 120 can be a coil structure or connected to the first test cavity 110 through a structure such as a heat spreader, so as to expand the heat transfer area between the first heat transfer module 120 and the first test cavity 110, thereby improving the heat transfer performance of the first heat transfer module 120. The heat transfer efficiency between the first heat transfer module 120 and the first test cavity 110 is determined; when the heat transfer medium flows through the first heat transfer module 120, the temperature of the heat transfer medium is different from the temperature in the first test cavity 110, and the first heat transfer module 120 and the heat transfer medium therein perform heat exchange with the first test cavity 110. Specifically, if the temperature of the first heat transfer module 120 and the heat transfer medium therein is higher than the temperature in the first test cavity 110, the first heat transfer module 120 releases heat to the first test cavity 110, and the heat is transferred from the first heat transfer module 120 to the first test cavity 110. If the temperature of the first heat transfer module 120 and the heat transfer medium therein is lower than the temperature in the first test cavity 110, the first heat transfer module 120 absorbs heat from the first test cavity 110, and the heat is transferred from the first test cavity 110 to the first heat transfer module 120.The input end of the first flow solenoid valve 130 is connected to the output end of the liquid storage tank 310 through a pipeline, and the output end of the first flow solenoid valve 130 is connected to the input end of the first heat transfer module 120. The heat transfer medium flows out from the output end of the liquid storage tank 310 and reaches the input end of the first flow solenoid valve 130. If the first flow solenoid valve 130 is in an open state, the heat transfer medium can flow from the input end of the first flow solenoid valve 130 to the output end of the first flow solenoid valve 130, and then flow into the first heat transfer module 120 from the output end of the first flow solenoid valve 130. If the first flow solenoid valve 130 is in an open state, the heat transfer medium can flow from the input end of the first flow solenoid valve 130 to the output end of the first flow solenoid valve 130. When the solenoid valve 130 is in the closed state, the heat transfer medium is blocked by the first flow solenoid valve 130 and cannot flow into the first heat transfer module 120. In a control cycle, the larger the duty cycle of the first flow solenoid valve 130, the longer the power-on time of the first flow solenoid valve 130 is. Correspondingly, the longer the opening time of the first flow solenoid valve 130 is, the larger the flow rate of the heat transfer medium passing through the first flow solenoid valve 130 is. When the duty cycle is 1, the first flow solenoid valve 130 is in a fully open state, and when the duty cycle is 0, the first flow solenoid valve 130 is in a fully closed state. In some examples of the embodiments of the present application, such as. Figure 2 As shown, the output end of the first heat transfer module 120 is connected to the input end of the liquid storage tank 310 through a pipeline. After the heat transfer medium exchanges heat with the first test chamber 110 through the first heat transfer module 120, it can flow back to the liquid storage tank 310. In some examples of the embodiments of the present application, Figure 3 As shown, the environmental testing system may further include a liquid return tank 520, and the output end of the first heat transfer module 120 is connected to the liquid return tank 520 through a pipeline. After the heat transfer medium exchanges heat with the first test chamber 110 through the first heat transfer module 120, it can flow to the liquid return tank 520. In some cases, the liquid return tank 520 is connected to the input end of the liquid storage tank 310 through a pipeline, and the heat transfer medium (after filtration) can be added to the liquid storage tank 310 through the liquid return tank 520. In some examples of the embodiments of the present application, such as Figure 5As shown, the output end of the liquid storage tank 310 is connected to the input end of the liquid storage tank 310 through the main pipeline, the input end of the first flow solenoid valve 130 is connected to the main pipeline through the first inflow branch, and the output end of the first heat transfer module 120 is connected to the main pipeline through the first outflow branch. The connection position of the first inflow branch and the main pipeline is located upstream of the connection position of the first outflow branch and the main pipeline. After the heat transfer medium exchanges heat with the first test chamber 110 through the first heat transfer module 120, it can flow back to the main pipeline, and then flow back to the liquid storage tank 310 from the main pipeline. In some examples of the embodiments of the present application, the output end of the liquid storage tank 310 is connected to the liquid return tank 520 through the main line, the input end of the first flow solenoid valve 130 is connected to the main line through the first inflow branch, and the output end of the first heat transfer module 120 is connected to the main line through the first outflow branch, and the connection position of the first inflow branch and the main line is located upstream of the connection position of the first outflow branch and the main line. After the heat transfer medium exchanges heat with the first test chamber 110 through the first heat transfer module 120, it can flow back to the main line and then flow from the main line to the liquid return tank 520. In some examples of the embodiments of the present application, the environmental testing system may also include a medium pump 510, wherein the output end of the liquid storage tank 310 is connected to the input end of the medium pump 510 through a pipeline, and the output end of the medium pump 510 is connected to the input end of the first flow solenoid valve 130 through a pipeline, and the heat transfer medium is driven by the medium pump 510 to flow from the output end of the liquid storage tank 310 to the input end of the first flow solenoid valve 130. In some examples of the embodiments of the present application, the output end of the liquid storage tank 310 is connected to the input end of the medium pump 510 through a pipeline, the output end of the medium pump 510 is connected to the liquid storage tank 310 or the return tank 520 through a main line, the input end of the first flow solenoid valve 130 is connected to the main line through a first inflow branch, the output end of the first heat transfer module 120 is connected to the main line through a first outflow branch, the output end of the medium pump 510 is located upstream of the connection position of the first inflow branch and the main line, and the connection position of the first inflow branch and the main line is located upstream of the connection position of the first outflow branch and the main line. Driven by the medium pump 510, the heat transfer medium flows back to the liquid storage tank 310 or flows to the return tank 520 from the output end of the liquid storage tank 310, and flows through the first heat transfer module 120 through the first inflow branch and the first outflow branch when flowing through the main line.

[0037] In some examples of the embodiments of the present application, Figures 2 to 5As shown, the environmental testing system also includes a first temperature measuring module 140. Specifically, the first test temperature box 100 includes the first temperature measuring module 140. The first temperature measuring module 140 can be a thermocouple, a thermistor or other types of temperature sensors or temperature measuring instruments. The measuring end of the first temperature measuring module 140 is arranged in the first test cavity 110. The temperature in the first test cavity 110 can be measured by the first temperature measuring module 140 to obtain a first test temperature. In some examples of the embodiments of the present application, the first temperature measuring module 140 can be replaced by a temperature measuring module outside the environmental testing system. If so, the first test temperature can be obtained from the temperature measuring module outside the environmental testing system. In some examples of the embodiments of the present application, such as Figure 4 As shown, the environmental testing system further includes a first control module 150. Specifically, the first test incubator 100 may include a first control module 150, the first control module 150 is coupled to the first temperature measuring module 140, the first control module 150 may periodically obtain the first test temperature from the first temperature measuring module 140, the first control module 150 is coupled to the first flow solenoid valve 130, and the first control module 150 may periodically control the duty cycle of the first flow solenoid valve 130. In some examples of the embodiments of the present application, such as Figure 4 As shown, the environmental testing system also includes a first input module 160. Specifically, the first test incubator 100 may include a first input module 160, which is coupled to the first control module 150. Setting data such as the target temperature may be input into the first control module 150 through the first input module 160.

[0038] In the embodiment of the present application, the second test incubator 200 and the first test incubator 100 can have the same configuration and connection relationship, and the second test incubator 200 can be understood by referring to the first test incubator 100 in the embodiment of the present application and its examples, wherein the second heat transfer module 220 is heat-transfer-connected to the second test chamber 420, the input end of the second flow solenoid valve 230 is connected to the output end of the liquid storage tank 310 through a pipeline, the output end of the second flow solenoid valve 230 is connected to the input end of the second heat transfer module 220, the output end of the second heat transfer module 220 can be connected to the input end of the liquid storage tank 310 through a pipeline, and can also be connected to the return liquid tank 520 through a pipeline, and a medium pump 510 can be set between the pipeline connection between the input end of the second flow solenoid valve 230 and the output end of the liquid storage tank 310, wherein the input end of the medium pump 510 is connected to the output end of the liquid storage tank 310 through a pipeline, and the medium pump 510 The output end is connected to the input end of the second flow solenoid valve 230 through a pipeline. In some examples, the second test temperature box 200 may include a second temperature measurement module 240, a second control module 250 and a second input module 260. The second temperature measurement module 240 is used to measure the second test temperature in the second test cavity 210. The second control module 250 is coupled to the second temperature measurement module 240, the second flow solenoid valve 230 and the second input module 260. The second control module 250 can periodically obtain the second test temperature from the second temperature measurement module 240. The second control module 250 can periodically control the duty cycle of the second flow solenoid valve 230. The target temperature and other setting data can be input into the second control module 250 through the second input module 260. When the first control module 150 is connected to the second control module 250, the first input module 160 and the second input module 260 can be integrated. It is understandable that, if the inventive concept of the present application is practicable, one of the first test incubator 100 and the at least one second test incubator 200 can be used as the first test incubator, and the other can be used as the second test incubator.

[0039] In some examples of the embodiments of the present application, Figure 4As shown, the environmental testing system also includes a third control module 320, which is coupled to the first control module 150. The third control module 320 can obtain the duty cycle information of the first flow solenoid valve 130 from the first control module 150. The third control module 320 is coupled to the second control module 250. The third control module 320 can obtain the duty cycle information of the second flow solenoid valve 230 from the second control module 250. The third control module 320 is coupled to the medium pump 510. If the output power of the medium pump 510 is configured to be adjustable, the third control module 320 can control the output power of the medium pump 510. If the output power of the medium pump 510 is configured to be fixed, the third control module 320 can control the start and stop of the medium pump 510. The third control module 320 is connected to the temperature control module 400. The third control module 320 can periodically control the output power of the temperature control module 400. In some examples of the embodiments of the present application, such as Figures 2 to 5 As shown, the environmental testing system also includes a third temperature measuring module 330, which can be a thermocouple, a thermal resistor or other types of temperature sensors or temperature measuring instruments. The measuring end of the third temperature measuring module 330 is arranged in the tank cavity of the liquid storage tank 310. The temperature of the heat transfer medium in the liquid storage tank 310 can be measured by the third temperature measuring module 330 to obtain the medium temperature in the tank. In some examples of the embodiments of the present application, the third temperature measuring module 330 can be replaced by a temperature measuring module outside the environmental testing system. If so, the medium temperature in the tank can be obtained from the temperature measuring module outside the environmental testing system. In some examples of the embodiments of the present application, the environmental testing system also includes a flow measurement module, which can determine the flow rate of the temperature control medium according to the measurement result of the flow measurement module.

[0040] In the embodiment of the present application, the heat transfer medium is heated or cooled by the temperature control module 400 in the liquid storage tank 310, and then flows out from the output end of the liquid storage tank 310. The output end of the liquid storage tank 310 is connected to the input end of the flow solenoid valve 500 through a pipeline, and the output end of the flow solenoid valve 500 is connected to the heat transfer module through a pipeline. The heat transfer medium flows from the liquid storage tank 310 to the heat transfer module through the pipeline, and in the process of flowing through the flow solenoid valve 500, the flow rate of the heat transfer medium is adjusted under the control of the flow solenoid valve 500. After the heat transfer medium enters the heat transfer module, it exchanges heat with the test cavity 300, thereby heating or cooling the test temperature field in the test cavity 300 to reach or approach the target temperature. Then, the heat transfer medium flows out from the output end of the heat transfer module. The heat exchange rate between the heat transfer module and the test cavity 300 affects the temperature of the test temperature field 310. Specifically, the greater the temperature difference between the heat transfer module and the heat transfer medium therein and the test cavity 300, the greater the heat exchange rate between the heat transfer module and the test cavity 300; the greater the medium flow in the heat transfer module, the greater the heat exchange rate between the heat transfer module and the test cavity 300.

[0041] The present application embodiment provides a temperature control method, which is applied to the environmental test system in the above-mentioned solution of the present application embodiment and its possible examples, and can improve the temperature control accuracy of the environmental test system compared with the above-mentioned first related technology and the second related technology. Figure 6 As shown, the temperature control method of the embodiment of the present application includes:

[0042] S110, obtaining the target temperature. One temperature value may be obtained as the target temperature; at least two temperature values ​​may be obtained, one of which may be used as the target temperature of the current test process, and after the current test process is completed, the other temperature value may be used as the target temperature of the next test process, until all at least two temperature values ​​are traversed; characteristic information such as the model of the instrument to be tested may also be obtained, and at least one test temperature point corresponding to the instrument to be tested may be determined according to the pre-stored test rules. If there is only one test temperature point, it may be determined as the target temperature; if the number of test temperature points is at least two, all at least two test temperature points may be sorted according to the test rules, and the test temperature point at the front of the sorting may be used as the target temperature of the current test; there may also be other methods of obtaining the target temperature. In an embodiment of the present application, if the environmental testing system includes a first control module 150 and a second control module 250, the subject that obtains the target temperature may be at least one of the first control module 150 and the second control module 250. In some cases, the first control module 150 and the second control module 250 are connected, so that when at least one of the first control module 150 and the second control module 250 obtains the target temperature, the information of the target temperature is sent to other subjects in the first control module 150 and the second control module 250.

[0043] S120, periodically obtain the first test temperature, control the duty cycle of the first flow solenoid valve according to the target temperature and the first test temperature, so that the first test temperature approaches or reaches the target temperature, wherein the first test temperature is used to represent the temperature of the first test chamber. It can be understood that the duty cycle of the first flow solenoid valve 130 can affect the flow rate of the temperature control medium. When other influencing factors remain unchanged, the duty cycle of the first flow solenoid valve 130 is positively correlated with the flow rate of the temperature control medium. In some cases, the environmental test system includes a first temperature measurement module 140, and the first test temperature can be periodically obtained through the first temperature measurement module 140. In some cases, a temperature measurement module similar to the first temperature measurement module 140 is located outside the environmental test system. Accordingly, the first test temperature can be obtained from the temperature measurement module located outside the environmental test system. In some cases, the environmental test system includes a first control module 150, and the first control module 150 obtains the first test temperature and controls the duty cycle of the first flow solenoid valve 130 according to the target temperature and the first test temperature. An allowable temperature deviation can be preset, and the allowable temperature deviation can be determined by a test rule. When the deviation between the first test temperature and the target temperature is less than or equal to the allowable temperature deviation, the first test temperature is deemed to have reached the target temperature. When the deviation between the first test temperature and the target temperature is greater than the allowable temperature deviation, the first test temperature is deemed not to have reached the target temperature. The first test temperature is made to approach the target temperature, including, if the first test temperature has not reached the target temperature, reducing the deviation between the first test temperature and the target temperature, reducing the deviation between the first test temperature and the target temperature, and making the test temperature reach the target temperature, including, making the deviation between the first test temperature and the target temperature continuously less than or equal to the allowable temperature deviation until the test task is completed or the target temperature is changed. The judgment logic for the second test temperature approaching or reaching the target temperature is the same or similar to that of the first test temperature. According to the target temperature and the first test temperature, the heat exchange rate between the first heat transfer module 120 and the first test cavity 110 can be judged. If the heat exchange rate is judged to be too large, the duty cycle of the first flow solenoid valve 130 is reduced. When the duty cycle of the first flow solenoid valve 130 is reduced, the rate of the heat transfer medium flowing into the first heat transfer module 120 is reduced, and the heat exchange rate between the first heat transfer module 120 and the first test cavity 110 is reduced. If the heat exchange rate is judged to be too small, the duty cycle of the first flow solenoid valve 130 is increased. When the duty cycle of the first flow solenoid valve 130 is increased, the rate of the heat transfer medium flowing into the first heat transfer module 120 is increased, and the heat exchange rate between the first heat transfer module 120 and the first test cavity 110 is increased. The above adjustment can make the first test temperature approach or reach the target temperature.

[0044] S130, periodically obtain the second test temperature, control the duty cycle of the second flow solenoid valve according to the target temperature and the second test temperature, so that the second test temperature approaches or reaches the target temperature, wherein the second test temperature is used to represent the temperature of the second test chamber. It can be understood that the duty cycle of the second flow solenoid valve 230 can affect the flow rate of the temperature control medium. When other influencing factors remain unchanged, the duty cycle of the second flow solenoid valve 230 is positively correlated with the flow rate of the temperature control medium. In some cases, the environmental test system includes a second temperature measurement module 240, and the second test temperature can be periodically obtained through the second temperature measurement module 240. In some cases, a temperature measurement module similar to the second temperature measurement module 240 is located outside the environmental test system. Accordingly, the second test temperature can be obtained from the temperature measurement module located outside the environmental test system. In some cases, the environmental test system includes a second control module 250, and the second control module 250 obtains the second test temperature and controls the duty cycle of the second flow solenoid valve 230 according to the target temperature and the second test temperature. According to the target temperature and the second test temperature, the heat exchange rate between the second heat transfer module 220 and the second test cavity 210 can be judged. If the heat exchange rate is judged to be too large, the duty cycle of the second flow solenoid valve 230 is reduced. When the duty cycle of the second flow solenoid valve 230 is reduced, the rate of the heat transfer medium flowing into the second heat transfer module 220 is reduced, and the heat exchange rate between the second heat transfer module 220 and the second test cavity 210 is reduced. If the heat exchange rate is judged to be too small, the duty cycle of the second flow solenoid valve 230 is increased. When the duty cycle of the second flow solenoid valve 230 is increased, the rate of the heat transfer medium flowing into the second heat transfer module 220 is increased, and the heat exchange rate between the second heat transfer module 220 and the second test cavity 210 is increased. The above adjustment can make the first test temperature approach or reach the target temperature.

[0045] S140. Obtain the target flow range. The target flow range can be factory preset, or manually input or temporarily preset based on historical flow data. The target flow range is used to indicate that when the first test temperature and the second test temperature are continuously at the target temperature within the preset time period, the parameter representing the flow of the temperature control medium may be in the range. The parameter form representing the flow of the temperature control medium is different, and the expression form of the target flow range is also different. The upper limit of the target flow range is less than the upper limit that the flow of the temperature control medium may reach, and the lower limit of the target flow range is greater than the lower limit that the flow of the temperature control medium may reach. In some cases, the flow of the temperature control medium can be expressed by the flow of the heat transfer medium, and accordingly, the target flow range can also be expressed by the flow range of the heat transfer medium. In some cases, the flow of the temperature control medium can be expressed by parameters that affect the flow of the heat transfer medium, such as the first flow solenoid valve 130 and The duty cycle of the second flow solenoid valve 230, the output power of the medium pump 510, and the combination of at least two parameters affecting the flow of the heat transfer medium, etc., accordingly, the target flow range can also be expressed by the range of parameters affecting the flow of the heat transfer medium; the initialization target flow range can be derived from empirical data or estimated data, for example, the upper and lower limits of the temperature control medium flow rate are set to [0,1], then the initialization target flow range can be set to [0.4,0.6]. In the subsequent testing process, if it is necessary to increase the sensitivity of the temperature control module to changes in actual test conditions, the range of the target flow range can be narrowed, for example, set to [0.45,0.55]. If it is necessary to reduce the impact of environmental disturbances on the temperature control module, the range of the target flow range can be expanded, for example, set to [0.35,0.65].

[0046] S150, periodically obtain the temperature control medium flow rate, and control the output power of the temperature control module according to the target flow range and the temperature control medium flow rate, wherein the temperature control medium flow rate is used to represent the sum of the heat transfer medium flow rate flowing into the first heat transfer module and the heat transfer medium flow rate flowing into the second heat transfer module. If the temperature control medium flow rate is less than the lower limit of the target flow range, the output power of the temperature control module is reduced; if the temperature control medium flow rate is greater than the upper limit of the target flow range, the output power of the temperature control module is increased. It is understandable that the output power of the temperature control module 400 can affect the temperature of the heat transfer medium. For example, if the heating power of the temperature control module 400 increases or the cooling power of the temperature control module 400 decreases, the temperature of the heat transfer medium rises. For another example, if the heating power of the temperature control module 400 decreases or the cooling power of the temperature control module 400 increases, the temperature of the heat transfer medium decreases. It is understandable that the temperature change of the heat transfer medium can affect the first test temperature, and the temperature change of the heat transfer medium can also affect the second test temperature. Specifically, when other influencing factors remain unchanged, if the temperature of the heat transfer medium tends to increase, the first test temperature tends to increase, if the temperature of the heat transfer medium tends to remain unchanged, the first test temperature tends to remain unchanged, and if the temperature of the heat transfer medium tends to decrease, the first test temperature tends to decrease. With reference to the aforementioned example of the embodiment of the present application, the method of obtaining the flow rate of the temperature control medium can be through flow measurement, or it can be obtained through the output power of the first flow solenoid valve 130, the second flow solenoid valve 230 and the medium pump 510. It is understandable that the flow rate of the temperature control medium has the same dimension as the target flow interval. A judgment is made based on the target flow range and the temperature control medium flow rate. If the temperature control medium flow rate is less than the lower limit of the target flow range, the output power of the temperature control module 400 can be reduced. If the temperature control medium flow rate is greater than the upper limit of the target flow range, the output power of the temperature control module 400 can be increased. The adjustment range of the output power of the temperature control module can be preset. Based on the adjustment range, at a control moment of the temperature control module 400, if it is determined to reduce the output power of the temperature control module 400, the current output power of the temperature control module 400 can be reduced by a preset adjustment range as the output power of the adjusted temperature control module 400. If it is determined to increase the output power of the temperature control module 400, the current output power of the temperature control module 400 can be increased by a preset adjustment range as the output power of the adjusted temperature control module 400. The preset adjustment range can be fixed, or it can be increased or decreased according to actual control needs.In some cases, the output power of the temperature control module is controlled according to the temperature control medium flow rate and the target flow range at the current moment. If the temperature control medium flow rate at the current moment is greater than the upper limit of the target flow range, the output power of the temperature control module is increased. If the temperature control medium flow rate at the current moment is less than the upper limit of the target flow range and greater than the lower limit of the target flow range, the output power of the temperature control module is kept unchanged. If the temperature control medium flow rate at the current moment is less than the lower limit of the target flow range, the output power of the temperature control module is reduced. If the temperature control medium flow rate at the current moment is equal to the upper limit of the target flow range, the output power of the temperature control module can be increased or maintained unchanged. If the temperature control medium flow rate at the current moment is equal to the lower limit of the target flow range, the output power of the temperature control module can be reduced or maintained unchanged. In some cases, assuming that the output power of the temperature control module remains unchanged, the temperature control medium flow rate corresponding to the next control moment of the temperature control module is calculated according to the temperature control medium flow rate and its change trend at the current moment, that is, the expected value of the temperature control medium flow rate. If the expected value of the temperature control medium flow rate is greater than the upper limit of the target flow rate interval, the output power of the temperature control module is increased. If the expected value of the temperature control medium flow rate is less than the upper limit of the target flow rate interval and greater than the lower limit of the target flow rate interval, the output power of the temperature control module is kept unchanged. If the expected value of the temperature control medium flow rate is less than the lower limit of the target flow rate interval, the output power of the temperature control module is reduced. If the expected value of the temperature control medium flow rate is equal to the upper limit of the target flow rate interval, the output power of the temperature control module can be increased or kept unchanged. If the expected value of the temperature control medium flow rate is equal to the lower limit of the target flow rate interval, the output power of the temperature control module can be reduced or kept unchanged. There may also be other comparison methods between the temperature control medium flow rate and the target flow rate interval, which are not listed one by one in this embodiment.

[0047] Taking the test process in the heating mode as an example, the first instrument to be tested is placed in the first test cavity, and the second instrument to be tested is placed in the second test cavity; the test is started, and in the heating stage, the duty cycle of the first flow solenoid valve 130 is periodically increased according to the first test temperature and the target temperature, and the heat transfer medium flow of the first heat transfer module 120 is periodically increased; according to the second test temperature and the target temperature, the duty cycle of the second flow solenoid valve 230 is periodically increased, and the heat transfer medium flow of the second heat transfer module 220 is periodically increased. When the temperature control medium flow increases to exceed the target flow range, the output power of the temperature control module 400 is increased. The temperature of the heat transfer medium in the liquid storage tank 310 increases periodically, and the heat transfer medium exchanges heat with the first test chamber 110 through the first heat transfer module 120, so that the first test temperature increases, and the heat transfer medium exchanges heat with the second test chamber 210 through the second heat transfer module 220, so that the second test temperature increases; thereafter, in the steady-state control stage, if the output power of the temperature control module 400 is greater than the actual test condition requirement, and the temperature of the heat transfer medium is higher than the actual test condition requirement, the duty cycle of the first flow solenoid valve 130 decreases, and the duty cycle of the second flow solenoid valve 230 decreases. When the flow rate of the temperature control medium decreases to exceed the target flow range, The output power of the temperature control module 400 decreases. After the output power of the temperature control module 400 is adjusted, if the output power of the temperature control module 400 reaches the actual test condition requirement and the temperature of the heat transfer medium reaches the actual test condition requirement, the duty cycle of the first flow solenoid valve 130 increases to within the target duty cycle range, and the duty cycle of the second flow solenoid valve 230 increases to within the target duty cycle range. When the flow rate of the temperature control medium increases to the target flow rate range, the temperature control module 400 maintains this output power unchanged. If the output power of the temperature control module 400 is less than the actual test condition requirement and the temperature of the heat transfer medium is lower than the actual test condition requirement, the first flow solenoid valve 130 increases to within the target duty cycle range. The duty cycle of the magnetic valve 130 increases, and the duty cycle of the second flow solenoid valve 230 increases. When the flow rate of the temperature control medium increases to exceed the target flow rate interval, the output power of the temperature control module 400 increases. After the output power of the temperature control module 400 is adjusted, if the output power of the temperature control module 400 meets the actual test condition requirements, and the temperature of the heat transfer medium meets the actual test condition requirements, the duty cycle of the first flow solenoid valve 130 is reduced to within the target duty cycle interval, and the duty cycle of the second flow solenoid valve 230 is reduced to within the target duty cycle interval. When the flow rate of the temperature control medium is reduced to the target flow rate interval, the temperature control module 400 maintains this output power unchanged;In some cases, if the output power of the temperature control module 400 is slightly greater than the actual test condition requirement, and the temperature of the heat transfer medium is slightly higher than the actual test condition requirement, the duty cycle of the first flow solenoid valve 130 may be within the target flow range and close to the lower limit of the target flow range. At this time, the output power of the temperature control module 400 will not be adjusted temporarily. When the environmental disturbance causes the temperature of the first test chamber to change or change trend, the duty cycle of the first flow solenoid valve 130 is adjusted and is lower than the lower limit of the target flow range. If this temporary disturbance is obtained by the process of obtaining the flow of the temperature control medium, the temperature control module 400 The output power is reduced, thereby meeting the actual test condition requirements. Subsequently, when the environmental disturbance disappears, the duty cycle of the first flow solenoid valve 130 will return to the target duty cycle range, and the output power of the temperature control module 400 is slightly less than the actual test condition requirements. In some cases, if the output power of the temperature control module 400 meets the actual test condition requirements, when the environmental disturbance causes the temperature of the first test chamber to change or change trend, the duty cycle of the first flow solenoid valve 130 is adjusted but can still be maintained within the target flow range, and accordingly, the output power of the temperature control module 400 remains unchanged. ;

[0048] Taking the test process in the refrigeration mode as an example, the first instrument to be tested is placed in the first test cavity, and the second instrument to be tested is placed in the second test cavity; the test is started, and in the cooling stage, the duty cycle of the first flow solenoid valve 130 is periodically increased according to the first test temperature and the target temperature, and the heat transfer medium flow of the first heat transfer module 120 is periodically increased; according to the second test temperature and the target temperature, the duty cycle of the second flow solenoid valve 230 is periodically increased, and the heat transfer medium flow of the second heat transfer module 220 is periodically increased. When the temperature control medium flow increases to exceed the target flow range, the output power of the temperature control module 400 is increased. The temperature of the heat transfer medium in the liquid storage tank 310 decreases periodically, and the heat transfer medium exchanges heat with the first test chamber 110 through the first heat transfer module 120 to reduce the first test temperature. The heat transfer medium exchanges heat with the second test chamber 210 through the second heat transfer module 220 to reduce the second test temperature. Afterwards, in the steady-state control stage, if the output power of the temperature control module 400 is greater than the actual test condition requirement, and the temperature of the heat transfer medium is lower than the actual test condition requirement, the duty cycle of the first flow solenoid valve 130 decreases, and the duty cycle of the second flow solenoid valve 230 decreases. When the flow rate of the temperature control medium decreases to exceed the target flow range, The output power of the temperature control module 400 decreases. After the output power of the temperature control module 400 is adjusted, if the output power of the temperature control module 400 reaches the actual test condition requirement and the temperature of the heat transfer medium reaches the actual test condition requirement, the duty cycle of the first flow solenoid valve 130 increases to within the target duty cycle range, and the duty cycle of the second flow solenoid valve 230 increases to within the target duty cycle range. When the flow rate of the temperature control medium increases to the target flow rate range, the temperature control module 400 maintains this output power unchanged. If the output power of the temperature control module 400 is less than the actual test condition requirement and the temperature of the heat transfer medium is higher than the actual test condition requirement, the first flow solenoid valve 130 increases to within the target duty cycle range. The duty cycle of the magnetic valve 130 increases, and the duty cycle of the second flow solenoid valve 230 increases. When the flow rate of the temperature control medium increases to exceed the target flow rate range, the output power of the temperature control module 400 increases. After the output power of the temperature control module 400 is adjusted, if the output power of the temperature control module 400 meets the actual test working condition requirements and the temperature of the heat transfer medium meets the actual test working condition requirements, the duty cycle of the first flow solenoid valve 130 is reduced to within the target duty cycle range, and the duty cycle of the second flow solenoid valve 230 is reduced to within the target duty cycle range. When the flow rate of the temperature control medium is reduced to the target flow rate range, the temperature control module 400 maintains this output power unchanged.

[0049] In the embodiment of the present application, S110 may be performed earlier than S120 and S130, or may be performed when S120 is started, or may be performed when S130 is started. S140 may be performed earlier than S150, or may be performed when S150 is started. S110 and S140 may be performed simultaneously, for example, both the target temperature and the target flow range are obtained in one process. S110 may be performed earlier than or later than S140. S120, S130 and S150 are all continuous operations, and S120, S130 and S150 operate independently of each other. At least part of the cycle of S120 may overlap with at least part of the cycle of S150, and at least part of the cycle of S130 may overlap with at least part of the cycle of S150.

[0050] In some examples of the embodiments of the present application, the environmental testing system also includes a medium pump 510 and a liquid return tank 520, the input end of the medium pump 510 is connected to the output end of the liquid storage tank 310, the output end of the medium pump 510 is connected to the input end of the first flow solenoid valve 130, the input end of the second flow solenoid valve 230 and the input end of the liquid return tank 520, and the medium pump is used to drive the heat transfer medium from the input end of the medium pump 510 to the output end of the medium pump; the temperature control method also includes: the output power of the medium pump 510 is configured to be adjustable; S210, obtaining Target duty cycle interval; S220, according to the duty cycle of the first flow solenoid valve 130 and the target duty cycle interval, the output power of the medium pump 510 is periodically controlled, wherein, S221, if the duty cycle of the first flow solenoid valve 130 is greater than the upper limit of the target duty cycle interval, the output power of the medium pump 510 is increased, S222, if the duty cycle of the first flow solenoid valve 130 is less than the lower limit of the target duty cycle interval, the output power of the medium pump 510 is reduced; the control period of the medium pump 510 is greater than the control period of the first flow solenoid valve 130. Exemplarily, taking the heating process in the heating mode as an example, the duty cycle of the first flow solenoid valve 130 is adjusted according to the first test temperature and the target temperature, so that the duty cycle of the first flow solenoid valve 130 increases, the heat transfer medium flowing into the first heat transfer module 120 increases, the heat transfer rate between the first heat transfer module 120 and the first test cavity 110 increases, and the rate at which the first test temperature changes to the target temperature increases. When the duty cycle of the first flow solenoid valve 130 is greater than the upper limit of the target duty cycle interval, increasing the output power of the medium pump 510 can further increase the flow rate of the heat transfer medium flowing into the first heat transfer module 120, thereby further increasing the heat transfer rate between the first heat transfer module 120 and the first test cavity 110, and further increasing the rate at which the first test temperature changes to the target temperature. The cooling process in the cooling mode is similar to this. By increasing the heating and cooling rates, the temperature control rate of the environmental test system can be improved, and the test efficiency can be improved. Exemplarily, taking the cooling process in the heating mode as an example, the duty cycle of the first flow solenoid valve 130 is adjusted according to the first test temperature and the target temperature, so that the duty cycle of the first flow solenoid valve 130 is reduced, the heat transfer medium flowing into the first heat transfer module 120 is reduced, the heat transfer rate between the first heat transfer module 120 and the first test cavity 110 is reduced, and the rate at which the first test temperature changes to the target temperature increases. When the duty cycle of the first flow solenoid valve 130 is less than the lower limit of the target duty cycle range, reducing the output power of the medium pump 510 can further reduce the flow of the heat transfer medium flowing into the first heat transfer module 120, thereby further reducing the heat transfer rate between the first heat transfer module 120 and the first test cavity 110, and further increasing the rate at which the first test temperature changes to the target temperature. The heating process in the cooling mode is similar to this. By increasing the heating and cooling rates, the temperature control rate of the environmental test system can be improved, and the test efficiency can be improved.Exemplarily, when the first test temperature reaches the target temperature or is sufficiently close to the target temperature, the duty cycle of the first flow solenoid valve 130 is adjusted according to the first test temperature and the target temperature, so that the duty cycle of the first flow solenoid valve 130 is reduced, the heat transfer medium flowing into the first heat transfer module 120 is reduced, and the heat transfer rate between the first heat transfer module 120 and the first test cavity 110 is reduced. When the duty cycle of the first flow solenoid valve 130 is less than the lower limit of the target duty cycle range, the output power of the medium pump 510 is reduced, which can further reduce the flow rate of the heat transfer medium flowing into the first heat transfer module 120, thereby further reducing the heat transfer rate between the first heat transfer module 120 and the first test cavity 110, reducing the fluctuation degree of the first test temperature, and improving the temperature control accuracy of the environmental testing system. Since the control period of the medium pump 510 is greater than the control period of the first flow solenoid valve 130, by adjusting the output power of the medium pump 510, the duty cycle of the first flow solenoid valve 130 can be adjusted to the target duty cycle range as much as possible, thereby expanding the adjustment range of the first flow solenoid valve 130 and improving the response efficiency of the first flow solenoid valve 130 to environmental disturbances.

[0051] In some examples of the embodiments of the present application, the aforementioned periodic acquisition of the temperature control medium flow rate includes: determining the temperature control medium flow rate according to the output power of the medium pump, the duty cycle of the first flow solenoid valve, and the duty cycle of the second flow solenoid valve. According to the output power of the medium pump, the total flow rate of the heat transfer medium flowing out of the liquid storage tank 310 can be determined, according to the duty cycle of the first flow solenoid valve, the proportion of the total flow rate of the heat transfer medium flowing into the first heat transfer module 120 can be determined, according to the duty cycle of the second flow solenoid valve, the proportion of the total flow rate of the heat transfer medium flowing into the second heat transfer module 220 can be determined, and according to the total flow rate of the heat transfer medium, the proportion of the heat transfer medium flowing into the first heat transfer module 120, and the proportion of the second heat transfer module 220, the temperature control medium flow rate can be determined. In the embodiment of the present application, the acquisition of the temperature control medium flow is used for comparison with the target flow range. Therefore, in combination with the aforementioned periodic control of the output power of the medium pump 510 according to the duty cycle of the first flow solenoid valve 130 and the target duty cycle range, the method of acquiring the temperature control medium flow can be further simplified: the environmental test system is calibrated in advance to obtain the first pump threshold and the second pump threshold, the first pump threshold is less than the second pump threshold, if the duty cycle of the first flow solenoid valve 130 is within the target duty cycle range, the output power of the medium pump is obtained, if the output power of the medium pump is less than the first pump threshold, it can be determined that the temperature control medium flow is less than the lower limit of the target flow range, if the output power of the medium pump is greater than If the medium pump output power is greater than the first pump threshold and less than the second pump threshold, it can be determined that the temperature control medium flow is within the target flow range. If the medium pump output power is equal to the first pump threshold, the duty cycle of the first flow solenoid valve 130 and the duty cycle of the second flow solenoid valve 230 can be combined to further determine the relationship between the temperature control medium flow and the lower limit of the target flow range. If the medium pump output power is equal to the second pump threshold, the duty cycle of the first flow solenoid valve 130 and the duty cycle of the second flow solenoid valve 230 can be combined to further determine the relationship between the temperature control medium flow and the upper limit of the target flow range. The technical solution of the embodiment of the present application can reduce or replace the measurement of the flow rate of the heat transfer medium. Compared with measuring the flow rate of the temperature control medium through the flow measurement module, it can reduce the hardware configuration and structural configuration and reduce the system cost. Furthermore, the technical solution of the embodiment of the present application is used in an environmental testing system. During the environmental testing process, the target temperature may be lower than -40°C or higher than 150°C. The cost of the flow measurement module in such a low or high temperature environment will increase significantly. The embodiment of the present application will have a more beneficial effect on reducing the use or replacing the flow measurement module.

[0052] In some examples of the embodiments of the present application, the target duty cycle interval is obtained, including: if the duty cycle of the first flow solenoid valve is greater than the upper limit of the target duty cycle interval, and the duty cycle of at least one second flow solenoid valve is less than the lower limit of the target duty cycle interval, then the upper limit of the target duty cycle interval is increased; if the duty cycle of the first flow solenoid valve is less than the lower limit of the target duty cycle interval, and the duty cycle of at least one second flow solenoid valve is greater than the upper limit of the target duty cycle interval, then the lower limit of the target duty cycle interval is lowered; the upper limit of the target duty cycle interval is less than or equal to 0.6, and the lower limit of the target duty cycle interval is greater than or equal to 0.4. By default, a smaller initial range of the target duty cycle interval can be determined, for example, [0.45, 0.55], the initial lower limit of the target duty cycle interval is greater than or equal to 0.4, and the initial lower limit of the target duty cycle interval is less than or equal to 0.6. During the test, in some cases, if the actual test conditions of the first test temperature box 100 and the second test temperature box 200 are similar, the duty cycle change trend of the first flow solenoid valve 130 is the same as the duty cycle change trend of the second flow solenoid valve 230. If the output power of the temperature control module 400 is too small, the duty cycle of the first flow solenoid valve 130 and the duty cycle of the second flow solenoid valve 230 are both increased. If the output power of the temperature control module 400 is too large, the duty cycle of the first flow solenoid valve 130 and the duty cycle of the second flow solenoid valve 230 are both increased. The duty cycles of the first flow solenoid valve 130 are reduced, and the output power of the medium pump 510 is adjusted according to the duty cycle of the first flow solenoid valve 130 to meet the heat transfer medium flow demand of the second heat transfer module 220. In other cases, if the actual test conditions of the first test temperature box 100 and the second test temperature box 200 are quite different, it may happen that the duty cycle of the first flow solenoid valve 130 is greater than the upper limit of the target duty cycle range, and the duty cycle of at least one second flow solenoid valve 230 is less than the lower limit of the target duty cycle range. At this time, the upper limit of the target duty cycle range can be increased, so that the duty cycle of the first flow solenoid valve 130 falls within the target duty cycle range, and the output power of the medium pump 510 will not be increased accordingly, thereby reducing the reverse impact on the heat transfer medium flow of the second heat transfer module 220.

[0053] In some examples of the embodiments of the present application, the temperature control method further includes: if the duty cycle of the first flow solenoid valve is greater than 0.8 and the duty cycle of at least one second flow solenoid valve is less than the lower limit of the target duty cycle interval, then the output power of the temperature control module is reduced, the duty cycle of the first flow solenoid valve is controlled to be zero, and an early warning message is issued; if the duty cycle of the first flow solenoid valve is less than 0.2 and the duty cycle of at least one second flow solenoid valve is greater than the upper limit of the target duty cycle interval, then the output power of the temperature control module is reduced, the duty cycles of the first flow solenoid valve and the second flow solenoid valve are controlled to be zero, and an early warning message is issued. In conjunction with the aforementioned scheme of adjusting the upper and lower limits of the target duty cycle interval according to the duty cycle of the first flow solenoid valve and the duty cycle of at least one second flow solenoid valve, the embodiments of the present application propose an early warning method for temperature measurement failure in the first test temperature box.For example, taking the heating mode as an example, when the output power of the temperature control module 400 reaches the actual test condition, the measurement of the first test temperature fails, and the failure value of the first test temperature is greatly deviated from the actual first test temperature (beyond the allowable error range) or even irrelevant; if the failure value of the first test temperature causes the first flow solenoid valve 130 to be normally open (or close to being normally open), at the control moment of one or more medium pumps 510, the output power of the medium pump 510 is adjusted according to the duty cycle of the first flow solenoid valve 130 and the target duty cycle interval, so that the output power of the medium pump 510 is increased, and under its influence, the second heat transfer module 2 20, the heat transfer medium flow rate increases, and the second flow solenoid valve 230 is controlled according to the second test temperature and the target temperature, so that the duty cycle of the second flow solenoid valve 230 is reduced. When the duty cycle of at least one second flow solenoid valve is less than the lower limit of the target duty cycle interval, and the duty cycle of the first flow solenoid valve is greater than 0.8, it can be determined that the measurement failure of the first test temperature or other reasons lead to the control failure of the first flow solenoid valve 130, and the duty cycle of the first flow solenoid valve is controlled to zero, so as to perform protective control on the first test temperature box 100 that may have a fault, and at the same time, when the fault source is eliminated, the normal The second test incubator 200 is normally temperature controlled. In addition, issuing an early warning message can facilitate user maintenance. If the control failure direction of the first flow solenoid valve 130 is normally closed (or close to normally closed), at the control moment of one or more medium pumps 510, the output power of the medium pump 510 is adjusted according to the duty cycle of the first flow solenoid valve 130 and the target duty cycle interval, so that the output power of the medium pump 510 is reduced. Under its influence, the flow rate of the heat transfer medium in the second heat transfer module 220 is reduced, and the second flow solenoid valve 230 is controlled according to the second test temperature and the target temperature, so that the duty cycle of the second flow solenoid valve 230 is increased. When the duty cycle of at least one second flow solenoid valve is greater than the upper limit of the target duty cycle interval, and the duty cycle of the first flow solenoid valve is less than 0.2, it can be determined that the measurement of the first test temperature fails or other reasons lead to the control failure of the first flow solenoid valve 130, and the duty cycle of the first flow solenoid valve 130 is controlled to zero, thereby performing protective control on the first test temperature box 100 that may have a fault. In addition, in order to avoid excessive entry of the heat transfer medium after returning to normal, the duty cycle of the second flow solenoid valve 230 can be controlled to zero, thereby performing protective restrictions, and an early warning message can also be issued to facilitate user maintenance. The logic of the cooling mode is similar to that of the heating mode, and will not be repeated here.

[0054] In some examples of the embodiments of the present application, the environmental testing system also includes a medium pump and a liquid return tank, the input end of the medium pump is connected to the output end of the liquid storage tank, the output end of the medium pump is connected to the input end of the first flow solenoid valve, the input end of the second flow solenoid valve and the input end of the liquid return tank, and the medium pump is used to drive the heat transfer medium to flow from the input end of the medium pump to the output end of the medium pump; the temperature control method also includes: the output power of the medium pump is configured to be fixed; obtaining a target flow range, including obtaining a target duty cycle range, determining the target flow range according to the target duty cycle range, the upper limit of the target duty cycle range is less than or equal to 0.7, and the lower limit of the target duty cycle range is greater than or equal to 0.3; periodically obtaining the temperature control medium flow, including determining the temperature control medium flow according to the duty cycle of the first flow solenoid valve and the duty cycle of the second flow solenoid valve. Exemplarily, the output power of the medium pump can be configured to be fixed. If so, the flow rate of the heat transfer medium flowing out of the liquid storage tank 310 can be regarded as fixed, and the temperature control medium flow rate can be determined according to the duty cycle of the first flow solenoid valve 130 and the duty cycle of the second flow solenoid valve 230, and the target flow rate interval can be determined according to the target duty cycle interval. Exemplarily, a function of the temperature control medium flow rate is determined. During the test process, the duty cycle of the first flow solenoid valve 130 is determined according to the first test temperature and the target temperature, and the duty cycle of the second flow solenoid valve 230 is determined according to the second test temperature and the target temperature. At the control moment of the temperature control module 400, the duty cycle of the first flow solenoid valve 130 and the duty cycle of the second flow solenoid valve 230 determined above are substituted into the function of the temperature control medium flow rate, and the temperature control medium flow rate can be obtained. According to the temperature control medium flow rate and the target flow rate interval, the output power of the temperature control module 400 can be controlled.

[0055] In some examples of the embodiments of the present application, the temperature control method also includes: S310, obtaining the warning temperature. The warning temperature can be derived from empirical data or estimated data. For example, if the temperature range of the environmental test system is -70°C-150°C, the warning temperature can include 300°C. The warning temperature can be determined according to the target temperature. For example, if the target temperature is determined to be 100°C, the warning temperature can be determined to be 200°C by looking up a table, etc. If the target temperature is determined to be 50°C, the warning temperature can be determined to be 80°C by looking up a table, etc. It can be understood that if the warning temperature is determined according to the target temperature, the warning temperature can be different when the target temperature is different. The warning temperature can also be obtained or changed by input. S320, periodically obtain the medium temperature in the tank, and the medium temperature in the tank is used to represent the temperature of the heat transfer medium in the liquid storage tank. If the environmental testing system includes a third temperature measuring module 330 disposed in the liquid storage tank 310, the medium temperature in the tank can be obtained from the third temperature measuring module 330. If the environmental testing system does not include the third temperature measuring module 330, the medium temperature in the tank can also be obtained from other temperature measuring modules outside the environmental testing system that have the same function as the third temperature measuring module 330. If the environmental testing system includes a third control module 320, the third control module 320 obtains the measurement result from the third temperature measuring module 330 as the medium temperature in the tank. S330, compare the medium temperature in the tank with the warning temperature, and make a judgment based on the comparison result: if the medium temperature in the tank reaches the warning temperature, reduce the output power of the temperature control module, control the duty cycle of the first flow solenoid valve to zero, and issue a warning message. In the heating mode, when the warning temperature is higher than the target temperature, the target temperature is higher than the ambient temperature, and the temperature of the medium in the tank is lower than the warning temperature, the warning is not triggered. When the temperature of the medium in the tank continues to rise until it reaches the warning temperature, the warning is triggered, the output power of the temperature control module is reduced, and the temperature of the medium in the tank is reduced. At the same time, the duty cycle of the first flow solenoid valve 130 is controlled to be zero, which reduces the safety risk of the first test temperature box, and a warning message can also be issued for the user to check and maintain; in the cooling mode, when the warning temperature is lower than the target temperature, the target temperature is lower than the ambient temperature, and the temperature of the medium in the tank is higher than the warning temperature, the warning is not triggered. When the temperature of the medium in the tank continues to decrease until it reaches the warning temperature, the warning is triggered, the output power of the temperature control module is reduced, and the temperature of the medium in the tank is increased. At the same time, the duty cycle of the first flow solenoid valve 130 is controlled to be zero, which reduces the safety risk of the first test temperature box, and a warning message can also be issued for the user to check and maintain.

[0056] In some examples of the embodiments of the present application, the control cycle of the temperature control module is greater than the control cycle of the first flow solenoid valve, the first time interval is determined according to the flow path of the heat transfer medium between the liquid storage tank and the first heat transfer module, and the control cycle of the temperature control module is greater than the first time interval; the control cycle of the temperature control module is greater than the control cycle of the second flow solenoid valve, the second time interval is determined according to the flow path of the heat transfer medium between the liquid storage tank and the second heat transfer module, and the control cycle of the temperature control module is greater than the second time interval. The control cycle of the temperature control module 400 is greater than the control cycle of the first flow solenoid valve 130, the first time interval is determined according to the flow path of the heat transfer medium between the liquid storage tank 310 and the first heat transfer module 120, and the control cycle of the temperature control module 400 is greater than the first time interval, so that at the previous control moment of the temperature control module 400, the output power of the temperature control module 400 is adjusted (the adjustment method includes increasing, decreasing or unchanged), and the output power of the temperature control module 400 affects the temperature of the heat transfer medium in the liquid storage tank 310, and the heat transfer medium flows from the liquid storage tank 310 to the first heat transfer module 120. The first heat transfer module 120 is moved to perform heat exchange with the first test chamber 110 through the first heat transfer module 120, so that the first test temperature changes. The duty cycle of the first flow solenoid valve 130 is adjusted according to the first test temperature and the target temperature. The duty cycle of the first flow solenoid valve 130 will affect the flow rate of the temperature control medium. At the next control moment of the temperature control module 400, the output power of the temperature control module 400 is controlled according to the range of the flow rate of the temperature control medium and the target flow rate, and the adjustment result of the previous control moment of the temperature control module 400 can be responded to. The control cycle of the temperature control module 400 is greater than the control cycle of the second flow solenoid valve 230. The first time interval is determined according to the flow path of the heat transfer medium between the liquid storage tank 310 and the second heat transfer module 220. The control cycle of the temperature control module 400 is greater than the second time interval, so that at the previous control moment of the temperature control module 400, the output power of the temperature control module 400 is adjusted (the adjustment method includes increasing, decreasing or keeping unchanged), and the output power of the temperature control module 400 affects the temperature of the heat transfer medium in the liquid storage tank 310. The heat transfer medium flows from the liquid storage tank 310 to the second heat transfer module 220. The second heat transfer module 220 is moved to perform heat exchange with the second test chamber 210 through the second heat transfer module 220, so that the second test temperature changes. The duty cycle of the second flow solenoid valve 230 is adjusted according to the second test temperature and the target temperature. The duty cycle of the second flow solenoid valve 230 will affect the flow rate of the temperature control medium. At the next control moment of the temperature control module 400, the output power of the temperature control module 400 is controlled according to the range of the flow rate of the temperature control medium and the target flow rate, and the adjustment result of the previous control moment of the temperature control module 400 can be responded to.

[0057] In some examples of the embodiments of the present application, the environmental testing system may include only a heating mode, and correspondingly, the default target temperature is higher than the ambient reference temperature; in some examples of the embodiments of the present application, the environmental testing system may include only a cooling mode, and correspondingly, the default target temperature is lower than the ambient reference temperature; in some examples of the embodiments of the present application, the environmental testing system may include a heating mode and a cooling mode. In some cases, the heating mode may be actively selected, and at this time, the default target temperature is higher than the ambient reference temperature. The cooling mode may also be actively selected, and at this time, the default target temperature is lower than the ambient reference temperature. In some cases, the working mode may be switched after the target temperature is obtained, for example, the target temperature and the ambient reference temperature are obtained, and the target temperature and the ambient reference temperature are compared. If the target temperature is higher than the ambient reference temperature, the heating mode is entered, and if the target temperature is lower than the ambient reference temperature, the cooling mode is entered; the ambient reference temperature may be equal to the empirical value of the ambient temperature, such as 20°C or 25°C. If so, the ambient reference temperature may be pre-set, and the ambient reference temperature may also be equal to the actual ambient temperature. If so, the ambient temperature may be periodically measured and the measurement result may be used as the ambient reference temperature.

[0058] In some examples of the embodiments of the present application, corresponding to the heating mode of the environmental testing system, the first test temperature is periodically obtained, and the duty cycle of the first flow solenoid valve is controlled according to the target temperature and the first test temperature, so that the first test temperature approaches or reaches the target temperature, including: the target temperature is higher than the ambient reference temperature, if the first test temperature at the current moment is higher than the target temperature, the duty cycle of the first flow solenoid valve is reduced, if the first test temperature at the current moment is equal to the target temperature, the duty cycle of the first flow solenoid valve is kept unchanged, if the first test temperature at the current moment is lower than the target temperature, the duty cycle of the first flow solenoid valve is increased. Specifically, in the heating mode, the target temperature is higher than the ambient reference temperature, and correspondingly, the temperature of the heat transfer medium in the liquid storage tank 310 is higher than the target temperature, and the temperature of the heat transfer medium flowing into the first heat transfer module 120 is higher than the target temperature. The first test chamber 110 is periodically measured to obtain a first test temperature, and a judgment is made based on the first test temperature and the target temperature at the current moment: if the first test temperature at the current moment is higher than the target temperature, the duty cycle of the first flow solenoid valve 130 is reduced, the flow rate of the heat transfer medium flowing into the first heat transfer module 120 is reduced, the heat release of the first heat transfer module 120 to the first test chamber 110 is reduced, and the first test temperature is reduced, so that the first test chamber 110 is heated to a temperature lower than the target temperature. The temperature approaches or reaches the target temperature; if the first test temperature at the current moment is lower than the target temperature, the duty cycle of the first flow solenoid valve 130 is increased, the flow rate of the heat transfer medium flowing into the first heat transfer module 120 is increased, the amount of heat released from the first heat transfer module 120 to the first test cavity 110 is increased, and the first test temperature is increased, so that the first test temperature approaches or reaches the target temperature; if the first test temperature at the current moment is equal to the target temperature, the duty cycle of the first flow solenoid valve 130 is kept unchanged, the flow rate of the heat transfer medium flowing into the first heat transfer module 120 is kept unchanged, the amount of heat released from the first heat transfer module 120 to the first test cavity 110 is kept unchanged, and the first test temperature is stabilized at the target temperature.

[0059] In some examples of the embodiments of the present application, corresponding to the heating mode of the environmental testing system, the first test temperature is periodically obtained, and the duty cycle of the first flow solenoid valve is controlled according to the target temperature and the first test temperature, so that the first test temperature approaches or reaches the target temperature, including: at the last control moment of the first flow solenoid valve, the expected temperature after adjustment is determined according to the duty cycle of the adjusted first flow solenoid valve and the changing trend of the first test temperature, and the expected temperature after adjustment represents the expected value of the first test temperature at the current moment; the target temperature is higher than the ambient reference temperature, if the first test temperature at the current moment is higher than the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is reduced, if the first test temperature at the current moment is equal to the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is kept unchanged, if the first test temperature at the current moment is lower than the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is increased. Specifically, in the heating mode, the target temperature is higher than the ambient reference temperature, and correspondingly, the temperature of the heat transfer medium in the liquid storage tank 310 is higher than the target temperature, and the temperature of the heat transfer medium flowing into the first heat transfer module 120 is higher than the target temperature. In the embodiment of the present application, a preset change curve from the first test temperature to the target temperature can be determined according to the first test temperature at the current moment, the change trend of the first test temperature, and the target temperature. According to the preset change curve, the preset temperature corresponding to the next control moment of the first flow solenoid valve 130 can be determined, that is, the expected temperature after adjustment, which is the first test temperature at the current moment, the first test temperature at the current moment, and the target temperature. The temperature change trend and the duty cycle of the adjusted first flow solenoid valve 130 are determined. At the next control moment of the first flow solenoid valve 130, a comparison is made based on the actual first test temperature at that moment and the expected temperature after adjustment determined previously. If the first test temperature is the same as the expected temperature after adjustment, it indicates that the change of the first test temperature is consistent with the preset change curve, and the output power of the control module 400 can be kept unchanged. If the first test temperature is different from the expected temperature after adjustment, it indicates that the first test temperature is offset from the preset change curve, and the output power of the control module 400 can be increased or decreased, so that the first test temperature approaches the preset change curve.For example, the first test chamber 110 is periodically measured to obtain a first test temperature. At the Nth control moment of the first flow solenoid valve 130, the adjusted expected temperature at the N+1th control moment is determined according to the first test temperature at that moment, the duty cycle of the adjusted first flow solenoid valve 130 (adjustment methods include increase, decrease and remain unchanged), and the change trend of the first test temperature. Compared with the first test temperature at the Nth control moment, the adjusted expected temperature at the N+1th control moment is closer to the target temperature or equal to the target temperature. Then, based on the adjusted duty cycle of the first flow solenoid valve 130, the first heat transfer module 120 is controlled. The heat transfer medium flow rate is controlled to change the heat transfer efficiency between the first heat transfer module 120 and the first test chamber 110 accordingly. Then, at the N+1th control moment of the first flow solenoid valve 130, the first test temperature at this moment is compared with the expected temperature after adjustment at the N+1th control moment determined previously. If the first test temperature is lower than the expected temperature after adjustment, that is, between the two control moments of the first flow solenoid valve 130, the first test chamber 110 releases more heat to the external environment. Accordingly, the duty cycle of the first flow solenoid valve 130 is increased to increase the heat transfer medium flow rate to the first heat transfer module 120. , so that the first heat transfer module 120 can provide more heating to the first test chamber between the N+1th and N+2th moments, so as to balance with the more external environment heat release from the Nth to the N+1th moments. If the first test temperature is higher than the expected temperature after adjustment, that is, between the two control moments of the first flow solenoid valve 130, the first test chamber 110 releases less heat to the external environment. Accordingly, the duty cycle of the first flow solenoid valve 130 is reduced, and the flow rate of the heat transfer medium flowing to the first heat transfer module 120 is reduced, so that the first heat transfer module 120 can provide less heating to the first test chamber between the N+1th and the N+2th moments. Heat is released to balance the less external environment heat release from the Nth to the N+1th moment. If the first test temperature is equal to the expected temperature after adjustment, that is, between the two control moments of the first flow solenoid valve 130, the heat release of the first test chamber 110 to the external environment is the same as expected, and accordingly, the duty cycle of the first flow solenoid valve 130 is kept unchanged, and the heat transfer medium flow of the first heat transfer module 120 is kept unchanged. In addition, at the N+1th moment, the expected temperature after adjustment at the N+2th control moment is determined according to the first test temperature at the N+1th control moment, the change trend of the first test temperature and the duty cycle of the adjusted first flow solenoid valve 130.

[0060] In some examples of the embodiments of the present application, corresponding to the heating mode of the environmental testing system, the expected temperature before adjustment is determined according to the changing trend of the first test temperature, and the expected temperature before adjustment represents the expected value of the first test temperature at the next control moment of the flow solenoid valve; the target temperature is higher than the ambient reference temperature. If the expected temperature before adjustment is higher than the target temperature, the duty cycle of the first flow solenoid valve is reduced; if the expected temperature before adjustment is equal to the target temperature, the duty cycle of the first flow solenoid valve is kept unchanged; if the expected temperature before adjustment is lower than the target temperature, the duty cycle of the first flow solenoid valve is increased. Specifically, in the heating mode, the target temperature is higher than the ambient reference temperature, and correspondingly, the temperature of the heat transfer medium in the liquid storage tank 310 is higher than the target temperature, and the temperature of the heat transfer medium flowing into the first heat transfer module 120 is higher than the target temperature. In the embodiment of the present application, illustratively, the first test chamber 110 is periodically measured to obtain a first test temperature. At the Nth control moment of the first flow solenoid valve 130, according to the first test temperature at that moment and the change trend of the first test temperature at that moment, it can be determined that, while maintaining the current duty cycle of the first flow solenoid valve 130, the expected temperature value corresponding to the N+1th control moment of the first flow solenoid valve 130, that is, the expected temperature before adjustment, is determined. The expected temperature before adjustment is compared with the target temperature. If the expected temperature before adjustment is lower than the target temperature, the duty cycle of the first flow solenoid valve 130 is increased. Thereafter, the flow rate of the heat transfer medium flowing into the first heat transfer module 120 increases, and the heat release of the first heat transfer module 120 to the first test chamber 110 increases. At the N+1th control moment of the first flow solenoid valve 130, the first test temperature is higher than the expected temperature before adjustment. Compared with the expected temperature before adjustment, the first test temperature is closer to the target temperature or reaches the target temperature. If the expected temperature before adjustment is equal to the target temperature, the duty cycle of the first flow solenoid valve 130 is kept unchanged. Thereafter, the flow rate of the heat transfer medium flowing into the first heat transfer module 120 is kept unchanged, and the amount of heat released from the first heat transfer module 120 to the first test chamber 110 is kept unchanged. At the N+1th control moment of the first flow solenoid valve 130, the first test temperature is equal to the target temperature. If the expected temperature before adjustment is higher than the target temperature, the duty cycle of the first flow solenoid valve 130 is reduced. Thereafter, the flow rate of the heat transfer medium flowing into the first heat transfer module 120 is reduced, and the amount of heat released from the first heat transfer module 120 to the first test chamber 110 is reduced. At the N+1th control moment of the first flow solenoid valve 130, the first test temperature is lower than the expected temperature before adjustment. Compared with the expected temperature before adjustment, the first test temperature is closer to the target temperature or reaches the target temperature.

[0061] In some examples of the embodiments of the present application, corresponding to the cooling mode of the environmental test system, if the target temperature is lower than the ambient reference temperature, if the first test temperature at the current moment is higher than the target temperature, the duty cycle of the first flow solenoid valve is increased, if the first test temperature at the current moment is equal to the target temperature, the duty cycle of the first flow solenoid valve is kept unchanged, if the first test temperature at the current moment is lower than the target temperature, the duty cycle of the first flow solenoid valve is reduced. The judgment logic of the cooling mode can refer to the heating mode.

[0062] In some examples of the embodiments of the present application, corresponding to the cooling mode of the environmental test system, at the last control moment of the first flow solenoid valve, the expected temperature after adjustment is determined according to the duty cycle of the adjusted first flow solenoid valve and the change trend of the first test temperature, and the expected temperature after adjustment represents the expected value of the first test temperature at the current moment; if the target temperature is lower than the ambient reference temperature, if the first test temperature at the current moment is higher than the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is increased, if the first test temperature at the current moment is equal to the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is kept unchanged, and if the first test temperature at the current moment is lower than the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is reduced. The judgment logic of the cooling mode can refer to the heating mode.

[0063] In some examples of the embodiments of the present application, corresponding to the cooling mode of the environmental test system, the expected temperature before adjustment is determined according to the change trend of the first test temperature, and the expected temperature before adjustment represents the expected value of the first test temperature at the next control moment of the flow solenoid valve; the target temperature is lower than the ambient reference temperature, if the expected temperature before adjustment is higher than the target temperature, the duty cycle of the first flow solenoid valve is increased, if the expected temperature before adjustment is equal to the target temperature, the duty cycle of the first flow solenoid valve is kept unchanged, if the expected temperature before adjustment is lower than the target temperature, the duty cycle of the first flow solenoid valve is reduced. The judgment logic of the cooling mode can refer to the heating mode.

[0064] The embodiment of the present application also provides an environmental testing system, including: a liquid storage tank 310, used to accommodate a heat transfer medium; a temperature control module 400, used to heat or cool the heat transfer medium in the liquid storage tank 420; a first test temperature box 100, used to test a first instrument to be tested, the first test temperature box 100 includes a first test cavity 110, a first heat transfer module 120 and a first flow solenoid valve 130, the first test cavity 110 is used to accommodate the first instrument to be tested, the first heat transfer module 120 is used to perform heat exchange with the first test cavity 110 to adjust the temperature in the first test cavity 110, and the first flow solenoid valve 130 is used to control the flow of the heat transfer medium between the liquid storage tank 310 and the first heat transfer module 120; at least one second test temperature box 200 , used to test the second instrument to be tested, the second test temperature box 200 includes a second test cavity 210, a second heat transfer module 220 and a second flow solenoid valve 230, the second test cavity 210 is used to accommodate the second instrument to be tested, the second heat transfer module 220 is used to perform heat exchange with the second test cavity 210 to adjust the temperature in the second test cavity 210, and the second flow solenoid valve 230 is used to control the flow of heat transfer medium between the liquid storage tank 310 and the second heat transfer module 220; a control module, the control module is coupled with the temperature control module 400, the first flow solenoid valve 130 and the second flow solenoid valve 230, and the control module is used to execute pre-stored computer programs or instructions so that the environmental testing system executes the temperature control method in any of the aforementioned examples of the embodiments of the present application.

Claims

1. A temperature control method, characterized in that: Applied to an environmental testing system, the environmental testing system includes a liquid storage tank, a temperature control module, a first test temperature box and at least one second test temperature box, the liquid storage tank is used to accommodate a heat transfer medium, the temperature control module is used to heat or cool the heat transfer medium in the liquid storage tank, the first test temperature box includes a first test cavity, a first heat transfer module and a first flow solenoid valve, the first test cavity is used to accommodate a first instrument to be tested, the first heat transfer module is used to perform heat exchange with the first test cavity to adjust the temperature in the first test cavity, the first flow solenoid valve is used to control the flow of heat transfer medium between the liquid storage tank and the first heat transfer module, the second test temperature box includes a second test cavity, a second heat transfer module and a second flow solenoid valve, the second test cavity is used to accommodate a second instrument to be tested, the second heat transfer module is used to perform heat exchange with the second test cavity to adjust the temperature in the second test cavity, and the second flow solenoid valve is used to control the flow of heat transfer medium between the liquid storage tank and the second heat transfer module; The temperature control method comprises: Get the target temperature; Periodically acquiring a first test temperature, and controlling a duty cycle of the first flow solenoid valve according to the target temperature and the first test temperature, so that the first test temperature approaches or reaches the target temperature, wherein the first test temperature is used to represent the temperature of the first test chamber; Periodically acquiring a second test temperature, and controlling a duty cycle of the second flow solenoid valve according to the target temperature and the second test temperature, so that the second test temperature approaches or reaches the target temperature, wherein the second test temperature is used to represent the temperature of the second test chamber; Get the target flow range; The temperature control medium flow rate is periodically obtained, and the output power of the temperature control module is controlled according to the target flow range and the temperature control medium flow rate, wherein the temperature control medium flow rate is used to represent the sum of the heat transfer medium flow rate flowing into the first heat transfer module and the heat transfer medium flow rate flowing into the second heat transfer module. If the temperature control medium flow rate is less than the lower limit of the target flow range, the output power of the temperature control module is reduced; if the temperature control medium flow rate is greater than the upper limit of the target flow range, the output power of the temperature control module is increased.

2. The temperature control method according to claim 1, characterized in that: The environmental testing system further includes a medium pump and a liquid return tank, wherein the input end of the medium pump is connected to the output end of the liquid storage tank, and the output end of the medium pump is connected to the input end of the first flow solenoid valve, the input end of the second flow solenoid valve and the input end of the liquid return tank, and the medium pump is used to drive the heat transfer medium to flow from the input end of the medium pump to the output end of the medium pump; The temperature control method further comprises: The output power of the medium pump is configured to be adjustable; Get the target duty cycle interval; According to the duty cycle of the first flow solenoid valve and the target duty cycle interval, the output power of the medium pump is periodically controlled, wherein if the duty cycle of the first flow solenoid valve is greater than the upper limit of the target duty cycle interval, the output power of the medium pump is increased, and if the duty cycle of the first flow solenoid valve is less than the lower limit of the target duty cycle interval, the output power of the medium pump is reduced; The control period of the medium pump is greater than the control period of the first flow solenoid valve.

3. The temperature control method according to claim 2, characterized in that: The periodically obtaining the flow rate of the temperature control medium includes: The temperature control medium flow rate is determined according to the output power of the medium pump, the duty cycle of the first flow solenoid valve, and the duty cycle of the second flow solenoid valve.

4. The temperature control method according to claim 2, characterized in that: The obtaining of the target duty cycle interval includes: If the duty cycle of the first flow solenoid valve is greater than the upper limit of the target duty cycle interval, and the duty cycle of at least one of the second flow solenoid valves is less than the lower limit of the target duty cycle interval, then the upper limit of the target duty cycle interval is increased; If the duty cycle of the first flow solenoid valve is less than the lower limit of the target duty cycle interval, and the duty cycle of at least one of the second flow solenoid valves is greater than the upper limit of the target duty cycle interval, then lowering the lower limit of the target duty cycle interval; An initial upper limit of the target duty cycle interval is less than or equal to 0.6, and an initial lower limit of the target duty cycle interval is greater than or equal to 0.

4.

5. The temperature control method according to claim 3, characterized in that: The temperature control method further comprises: If the duty cycle of the first flow solenoid valve is greater than 0.8, and the duty cycle of at least one of the second flow solenoid valves is less than the lower limit of the target duty cycle range, the output power of the temperature control module is reduced, the duty cycle of the first flow solenoid valve is controlled to be zero, and a warning message is issued; If the duty cycle of the first flow solenoid valve is less than 0.2, and the duty cycle of at least one of the second flow solenoid valves is greater than the upper limit of the target duty cycle range, the output power of the temperature control module is reduced, the duty cycles of the first flow solenoid valve and the second flow solenoid valve are controlled to zero, and a warning message is issued.

6. The temperature control method according to claim 1, characterized in that: The environmental testing system further includes a medium pump and a liquid return tank, wherein the input end of the medium pump is connected to the output end of the liquid storage tank, and the output end of the medium pump is connected to the input end of the first flow solenoid valve, the input end of the second flow solenoid valve and the input end of the liquid return tank, and the medium pump is used to drive the heat transfer medium to flow from the input end of the medium pump to the output end of the medium pump; The temperature control method further comprises: The output power of the medium pump is configured to be fixed; The obtaining of the target flow interval includes obtaining a target duty cycle interval, and determining the target flow interval according to the target duty cycle interval, wherein the upper limit of the target duty cycle interval is less than or equal to 0.7, and the lower limit of the target duty cycle interval is greater than or equal to 0.3; The periodically acquiring the temperature control medium flow rate includes determining the temperature control medium flow rate according to a duty cycle of the first flow solenoid valve and a duty cycle of the second flow solenoid valve.

7. The temperature control method according to claim 1, characterized in that: The temperature control method further comprises: Get the warning temperature; Periodically acquiring the medium temperature in the tank, wherein the medium temperature in the tank is used to represent the temperature of the heat transfer medium in the liquid storage tank; If the temperature of the medium in the tank reaches the warning temperature, the output power of the temperature control module is reduced, the duty cycle of the first flow solenoid valve is controlled to be zero, and a warning message is issued.

8. The temperature control method according to claim 1, characterized in that: The control period of the temperature control module is greater than the control period of the first flow solenoid valve, a first time interval is determined according to a flow path of the heat transfer medium between the liquid storage tank and the first heat transfer module, and the control period of the temperature control module is greater than the first time interval; The control cycle of the temperature control module is greater than the control cycle of the second flow solenoid valve, the second time interval is determined according to the flow path of the heat transfer medium between the liquid storage tank and the second heat transfer module, and the control cycle of the temperature control module is greater than the second time interval.

9. The temperature control method according to claim 1, characterized in that: The periodically acquiring the first test temperature, and controlling the duty cycle of the first flow solenoid valve according to the target temperature and the first test temperature, so that the first test temperature approaches or reaches the target temperature, includes: The target temperature is higher than the ambient reference temperature. If the first test temperature at the current moment is higher than the target temperature, the duty cycle of the first flow solenoid valve is reduced. If the first test temperature at the current moment is equal to the target temperature, the duty cycle of the first flow solenoid valve is kept unchanged. If the first test temperature at the current moment is lower than the target temperature, the duty cycle of the first flow solenoid valve is increased. or, The target temperature is lower than the ambient reference temperature. If the first test temperature at the current moment is higher than the target temperature, the duty cycle of the first flow solenoid valve is increased. If the first test temperature at the current moment is equal to the target temperature, the duty cycle of the first flow solenoid valve is kept unchanged. If the first test temperature at the current moment is lower than the target temperature, the duty cycle of the first flow solenoid valve is reduced. or, At the last control moment of the first flow solenoid valve, according to the duty cycle of the first flow solenoid valve after adjustment and the change trend of the first test temperature, the expected temperature after adjustment is determined, and the expected temperature after adjustment represents the expected value of the first test temperature at the current moment; the target temperature is higher than the ambient reference temperature, if the first test temperature at the current moment is higher than the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is reduced, if the first test temperature at the current moment is equal to the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is kept unchanged, if the first test temperature at the current moment is lower than the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is increased; or, At the last control moment of the first flow solenoid valve, according to the duty cycle of the first flow solenoid valve after adjustment and the change trend of the first test temperature, the expected temperature after adjustment is determined, and the expected temperature after adjustment represents the expected value of the first test temperature at the current moment; the target temperature is lower than the ambient reference temperature, if the first test temperature at the current moment is higher than the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is increased, if the first test temperature at the current moment is equal to the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is kept unchanged, if the first test temperature at the current moment is lower than the expected temperature after adjustment, the duty cycle of the first flow solenoid valve is reduced; or, According to the variation trend of the first test temperature, the expected temperature before adjustment is determined, and the expected temperature before adjustment represents the expected value of the first test temperature at the next control moment of the flow solenoid valve; the target temperature is higher than the ambient reference temperature, if the expected temperature before adjustment is higher than the target temperature, the duty cycle of the first flow solenoid valve is reduced, if the expected temperature before adjustment is equal to the target temperature, the duty cycle of the first flow solenoid valve is kept unchanged, if the expected temperature before adjustment is lower than the target temperature, the duty cycle of the first flow solenoid valve is increased; or, According to the changing trend of the first test temperature, the expected temperature before adjustment is determined, and the expected temperature before adjustment represents the expected value of the first test temperature at the next control moment of the flow solenoid valve; the target temperature is lower than the ambient reference temperature. If the expected temperature before adjustment is higher than the target temperature, the duty cycle of the first flow solenoid valve is increased; if the expected temperature before adjustment is equal to the target temperature, the duty cycle of the first flow solenoid valve is kept unchanged; if the expected temperature before adjustment is lower than the target temperature, the duty cycle of the first flow solenoid valve is reduced.

10. An environmental testing system, characterized in that: include: A liquid storage tank for containing a heat transfer medium; A temperature control module, used for heating or cooling the heat transfer medium in the liquid storage tank; a first test temperature box, used for testing a first instrument to be tested, the first test temperature box comprising a first test chamber, a first heat transfer module and a first flow solenoid valve, the first test chamber being used for accommodating the first instrument to be tested, the first heat transfer module being used for performing heat exchange with the first test chamber to adjust the temperature in the first test chamber, and the first flow solenoid valve being used for controlling the flow of a heat transfer medium between the liquid storage tank and the first heat transfer module; At least one second test temperature box, used for testing a second instrument to be tested, the second test temperature box comprising a second test chamber, a second heat transfer module and a second flow solenoid valve, the second test chamber being used for accommodating the second instrument to be tested, the second heat transfer module being used for performing heat exchange with the second test chamber to adjust the temperature in the second test chamber, and the second flow solenoid valve being used for controlling the flow of heat transfer medium between the liquid storage tank and the second heat transfer module; A control module, wherein the control module is coupled to the temperature control module, the first flow solenoid valve, and the second flow solenoid valve, and the control module is used to execute a pre-stored computer program or instruction so that the environmental testing system executes the temperature control method described in any one of claims 1 to 9.

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