Non-linear cooling control method and device of environmental test chamber and environmental test chamber

Abstract

This invention discloses a nonlinear cooling control method, device, and environmental test chamber for an environmental test chamber. The method includes: acquiring the real-time temperature and real-time cooling time inside the environmental test chamber; calculating, based on the real-time temperature, real-time cooling time, and preset parameters, the total cooling difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, remaining average cooling rate deviation, and real-time cooling rate; and calculating, based on the preset parameters and the total cooling difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, remaining average cooling rate deviation, and real-time cooling rate, the variable frequency compressor speed, electronic expansion valve opening, evaporator fan speed, and condenser fan speed to control the operation of the variable frequency compressor, electronic expansion valve, evaporator fan, and condenser fan, thereby achieving nonlinear cooling control of the environmental test chamber.

Description

Technical Field

[0001] This invention relates to the field of environmental testing equipment control technology, and in particular to a nonlinear cooling control method, device, and environmental testing chamber for an environmental testing chamber. Background Technology

[0002] With the continuous advancement of life and technology, the requirements for product reliability are becoming increasingly stringent. In many fields, it is necessary to test the reliability of products or components during the process of cooling from high temperature to low temperature over a certain period of time, as well as the changes in material stress and material properties.

[0003] Currently, linear cooling time is controllable. For example, linear cooling from 85℃ to -40℃ at a rate of 10℃ / min would take 12.5 minutes. However, for nonlinear cooling, the cooling time is generally controlled based on the equipment's maximum capacity, making it uncontrollable. The cooling time is typically shorter than the required time, which can affect the accurate assessment of product or component reliability. Therefore, accurate time control is crucial in nonlinear cooling processes. Summary of the Invention

[0004] This invention provides a nonlinear cooling control method, device, and environmental test chamber for an environmental test chamber, in order to solve the problem of uncontrollable cooling time in existing nonlinear cooling control methods.

[0005] According to one aspect of the present invention, a nonlinear cooling control method for an environmental test chamber is provided, comprising:

[0006] Obtain the real-time temperature and cooling time inside the controlled environment test chamber;

[0007] Based on the real-time temperature inside the chamber, the real-time cooling time, and preset parameters, calculate the total cooling temperature difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, remaining average cooling rate deviation, and real-time cooling rate.

[0008] Based on the preset parameters and the total cooling temperature difference, the average cooling rate, the current average cooling rate, the remaining cooling time, the remaining average cooling rate, the remaining average cooling rate deviation, and the real-time cooling rate, the variable frequency compressor speed, electronic expansion valve opening, evaporator fan speed, and condenser fan speed of the controlled environment test chamber are calculated respectively.

[0009] The variable frequency compressor speed, the electronic expansion valve opening, the evaporator fan speed, and the condenser fan speed are used to control the operation of the variable frequency compressor, electronic expansion valve, evaporator fan, and condenser fan of the controlled environment test chamber, respectively, so as to achieve nonlinear cooling control of the controlled environment test chamber.

[0010] Optionally, the preset parameters include a preset starting temperature, a preset ending temperature, a preset total cooling time, and a preset sampling period;

[0011] Based on the real-time temperature inside the chamber, the real-time cooling time, and preset parameters, the total cooling temperature difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, remaining average cooling rate deviation, and real-time cooling rate are calculated respectively, including:

[0012] Calculate the total cooling temperature difference and average cooling rate based on the preset starting temperature, preset ending temperature and preset total cooling time;

[0013] Based on the real-time temperature inside the chamber and the real-time cooling time, calculate the current average cooling rate, the remaining cooling time, the remaining average cooling rate, and the deviation of the remaining average cooling rate.

[0014] The real-time cooling rate is calculated based on the real-time temperature inside the chamber and the preset sampling period.

[0015] Optionally, the total cooling temperature difference and average cooling rate can be calculated using the following formulas:

[0016] In the formula, For the total cooling temperature difference, To preset the starting temperature, To preset the final temperature, To preset the total cooling time, The average cooling rate;

[0017] The following formulas are used to calculate the current average cooling rate, remaining cooling time, remaining average cooling rate, and deviation of remaining average cooling rate:

[0018] In the formula, This refers to the real-time temperature inside the chamber. For real-time cooling time, This represents the current average cooling rate. For the remaining time to cool down, The remaining average cooling rate is the temperature reduction rate. The remaining average cooling rate deviation;

[0019] The real-time cooling rate is calculated using the following formula:

[0020] In the formula, For real-time cooling rate, For the preset sampling period, This represents the real-time temperature inside the chamber at the current sampling moment. This represents the real-time temperature inside the chamber at the previous sampling time.

[0021] Optionally, based on the preset parameters and the total cooling temperature difference, the average cooling rate, the current average cooling rate, the remaining cooling time, the remaining average cooling rate, the remaining average cooling rate deviation, and the real-time cooling rate, the variable frequency compressor speed, electronic expansion valve opening, evaporator fan speed, and condenser fan speed of the controlled environment test chamber are calculated respectively, including:

[0022] The variable frequency compressor speed control deviation is calculated based on the preset starting temperature, preset ending temperature, real-time cooling time, remaining cooling time, remaining average cooling rate, current average cooling rate, average cooling rate, and preset variable frequency compressor speed control deviation coefficient.

[0023] The variable frequency compressor speed is calculated based on the variable frequency compressor speed control deviation and the preset variable frequency compressor speed control proportional coefficient, preset variable frequency compressor speed control integral coefficient, and preset variable frequency compressor speed control differential coefficient.

[0024] The electronic expansion valve opening control deviation is calculated based on the preset starting temperature, preset ending temperature, real-time cooling time, remaining cooling time, remaining average cooling rate deviation, average cooling rate, real-time temperature inside the chamber, real-time cooling rate, and preset electronic expansion valve opening control deviation equity coefficient.

[0025] The opening degree of the electronic expansion valve is calculated based on the electronic expansion valve opening degree control deviation and the preset electronic expansion valve opening degree control proportional coefficient, preset electronic expansion valve opening degree control integral coefficient, and preset electronic expansion valve opening degree control differential coefficient.

[0026] The evaporator fan speed control deviation is calculated based on the preset start temperature, preset end temperature, real-time cooling time, remaining average cooling rate, average cooling rate, real-time temperature inside the chamber, real-time cooling rate, variable frequency compressor speed, electronic expansion valve opening, and preset evaporator fan speed control deviation equity coefficient.

[0027] The evaporator fan speed is calculated based on the evaporator fan speed control deviation and the preset evaporator fan speed control proportional coefficient, preset evaporator fan speed control integral coefficient, and preset evaporator fan speed control differential coefficient.

[0028] The condenser fan speed control deviation is calculated based on the preset start temperature, preset end temperature, real-time cooling time, current average cooling rate, average cooling rate, real-time cooling rate, variable frequency compressor speed, electronic expansion valve opening, and preset condenser fan speed control deviation equity coefficient.

[0029] The condenser fan speed is calculated based on the condenser fan speed control deviation and the preset condenser fan speed control proportional coefficient, preset condenser fan speed control integral coefficient, and preset condenser fan speed control differential coefficient.

[0030] Optionally, the variable frequency compressor speed control deviation and the variable frequency compressor speed are calculated using the following formulas:

[0031] ;

[0032] In the formula, For the speed control deviation of the variable frequency compressor, , , and All are preset variable frequency compressor speed control deviation equity coefficients. To preset the starting temperature, To preset the final temperature, The average cooling rate, For real-time cooling time, This represents the current average cooling rate. For the remaining time to cool down, The remaining average cooling rate is the temperature reduction rate. , and These are the preset proportional coefficient, preset integral coefficient, and preset derivative coefficient for variable frequency compressor speed control, respectively. This refers to the rotational speed of the variable frequency compressor.

[0033] Optionally, the electronic expansion valve opening control deviation and the electronic expansion valve opening are calculated using the following formulas:

[0034] In the formula, For deviation in the opening control of the electronic expansion valve, , , and All are preset electronic expansion valve opening control deviation coefficients. To preset the starting temperature, To preset the final temperature, The average cooling rate, For real-time cooling time, For the remaining time to cool down, To preset the total cooling time, The remaining average cooling rate deviation. For real-time cooling rate, , and These are the preset proportional coefficient, preset integral coefficient, and preset derivative coefficient for electronic expansion valve opening control, respectively. This refers to the opening degree of the electronic expansion valve.

[0035] Optionally, the evaporator fan speed control deviation and the evaporator fan speed are calculated using the following formulas:

[0036] In the formula, The deviation is due to the evaporator fan speed control error. , , and All are preset evaporator fan speed control deviation equity coefficients. This refers to the real-time temperature inside the chamber. To preset the starting temperature, To preset the final temperature, The average cooling rate, For real-time cooling time, For real-time cooling rate, The remaining average cooling rate is the temperature reduction rate. This refers to the speed of the variable frequency compressor. For the opening degree of the electronic expansion valve, , and These are the preset proportional coefficient, preset integral coefficient, and preset derivative coefficient for evaporator fan speed control, respectively. This refers to the evaporator fan speed.

[0037] Optionally, the condenser fan speed control deviation and the condenser fan speed are calculated using the following formulas:

[0038] In the formula, For condenser fan speed control deviation, , , and All are preset condenser fan speed control deviation equity coefficients. To preset the starting temperature, To preset the final temperature, The average cooling rate, For real-time cooling time, For real-time cooling rate, This represents the current average cooling rate. This refers to the speed of the variable frequency compressor. For the opening degree of the electronic expansion valve, , and These are the preset proportional coefficient, preset integral coefficient, and preset derivative coefficient for condenser fan speed control, respectively. This refers to the evaporator fan speed.

[0039] According to another aspect of the present invention, a nonlinear cooling control device for an environmental test chamber is provided, used to execute the nonlinear cooling control method for an environmental test chamber according to any embodiment of the present invention, the device comprising:

[0040] The acquisition module is used to acquire the real-time temperature and real-time cooling time inside the controlled environment test chamber;

[0041] The first calculation module is used to calculate the total cooling temperature difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, remaining average cooling rate deviation, and real-time cooling rate based on the real-time temperature inside the box, the real-time cooling time, and preset parameters.

[0042] The second calculation module is used to calculate the variable frequency compressor speed, electronic expansion valve opening, evaporator fan speed and condenser fan speed of the controlled environment test chamber according to the preset parameters and the total cooling temperature difference, the average cooling rate, the current average cooling rate, the remaining cooling time, the remaining average cooling rate, the remaining average cooling rate deviation and the real-time cooling rate, respectively.

[0043] The control module is used to control the operation of the variable frequency compressor, electronic expansion valve, evaporator fan and condenser fan of the test chamber under test according to the speed of the variable frequency compressor, the opening degree of the electronic expansion valve, the speed of the evaporator fan and the speed of the condenser fan, so as to realize the nonlinear cooling control of the test chamber under test.

[0044] According to another aspect of the present invention, an environmental test chamber is provided, comprising a chamber body, a control system, and a refrigeration system;

[0045] The refrigeration system includes a variable frequency compressor, a condenser, a condenser fan, an electronic expansion valve, an evaporator, and an evaporator fan;

[0046] The control system includes an internal temperature sensor, an evaporator fan speed control module, a compressor speed control module, an electronic expansion valve opening control module, a condenser fan speed control module, and a data acquisition and calculation control module.

[0047] The internal temperature sensor is electrically connected to the acquisition and calculation control module; the variable frequency compressor is electrically connected to the compressor speed control module; the electronic expansion valve is electrically connected to the electronic expansion valve opening control module; the evaporator fan is electrically connected to the evaporator fan speed control module; and the condenser fan is electrically connected to the condenser fan speed control module.

[0048] The variable frequency compressor, the condenser, the electronic expansion valve, and the evaporator are connected in series to form a circuit.

[0049] The technical solution provided by this invention obtains the real-time temperature and real-time cooling time inside the controlled environment test chamber; based on the real-time temperature, real-time cooling time, and preset parameters, it calculates the total cooling temperature difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, remaining average cooling rate deviation, and real-time cooling rate; and based on the preset parameters and the total cooling temperature difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, and remaining average cooling rate deviation, it calculates the real-time cooling rate. Rate deviation and real-time cooling rate are calculated for the variable frequency compressor speed, electronic expansion valve opening, evaporator fan speed, and condenser fan speed of the controlled environment test chamber. Based on the variable frequency compressor speed, electronic expansion valve opening, evaporator fan speed, and condenser fan speed, the operation of the variable frequency compressor, electronic expansion valve, evaporator fan, and condenser fan of the controlled environment test chamber is controlled to achieve nonlinear cooling control of the controlled environment test chamber. This makes the nonlinear cooling time controllable, while reducing system energy consumption and improving system reliability.

[0050] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 A flowchart of a nonlinear cooling control method for an environmental test chamber provided in an embodiment of the present invention;

[0053] Figure 2 This is a schematic diagram of the structure of an environmental test chamber provided in an embodiment of the present invention;

[0054] Figure 3 This is a schematic diagram of the structure of a nonlinear cooling control device for an environmental test chamber provided in an embodiment of the present invention;

[0055] Figure 4 This is a schematic diagram of the electronic device used in an embodiment of the present invention to provide a nonlinear cooling control method for an environmental test chamber. Detailed Implementation

[0056] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0057] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0058] Figure 1 This is a flowchart illustrating a nonlinear cooling control method for an environmental test chamber according to an embodiment of the present invention. This embodiment is applicable to the nonlinear cooling control of environmental test chambers. The method can be executed by a nonlinear cooling control device for an environmental test chamber. This device can be implemented in hardware and / or software and can be configured in any electronic device with communication capabilities. See also... Figure 1 The method includes:

[0059] S110. Obtain the real-time temperature and cooling time inside the controlled environment test chamber.

[0060] Specifically, Figure 2 This is a structural schematic diagram of an environmental test chamber provided in an embodiment of the present invention. See also: Figure 2The environmental test chamber includes an internal temperature sensor 1, a variable frequency compressor 2, a condenser 3, a condenser fan 4, an electronic expansion valve 5, an evaporator 6, an evaporator fan 7, an evaporator fan speed control module 8, a compressor speed control module 9, an electronic expansion valve opening control module 10, a condenser fan speed control module 11, and a data acquisition and calculation control module 12.

[0061] The real-time temperature inside the test chamber is obtained by an internal temperature sensor, and the real-time cooling time of the test chamber is obtained by an acquisition and calculation control module.

[0062] S120. Based on the real-time temperature inside the chamber, the real-time cooling time, and the preset parameters, calculate the total cooling temperature difference, the average cooling rate, the current average cooling rate, the remaining cooling time, the remaining average cooling rate, the remaining average cooling rate deviation, and the real-time cooling rate.

[0063] Among them, the preset parameters can be pre-set according to the test requirements. The preset parameters include preset starting temperature, preset ending temperature, preset total cooling time, and preset sampling period; the total cooling temperature difference refers to the total temperature change that needs to be completed in this cooling process; the average cooling rate refers to the theoretical average rate that needs to be achieved to maintain uniform cooling throughout the process; the current average cooling rate refers to the average cooling rate that has actually been completed from the start of cooling to the current moment, which can reflect the overall cooling capacity of the system over a period of time and is used to judge whether the previous control effect meets expectations; the remaining cooling time refers to the length of time remaining until the preset cooling end time; the remaining average cooling rate refers to the average rate that needs to be maintained in order to complete the remaining cooling task within the remaining time; the remaining average cooling rate deviation refers to the difference between the remaining average cooling rate and the target average cooling rate; and the real-time cooling rate refers to the instantaneous cooling rate within one sampling period. The total cooling temperature difference and the average cooling rate provide a global target benchmark. The current average cooling rate reflects the historical control effect. The remaining time and the remaining average cooling rate clarify the future control target. The deviation of the remaining average cooling rate quantifies the degree of deviation from the target. The real-time cooling rate captures the instantaneous changes of the system. By calculating these parameters together, every detail of the cooling process can be fully and accurately grasped, thereby improving the accuracy of time control.

[0064] Optionally, based on the real-time temperature inside the chamber, the real-time cooling time, and preset parameters, calculate the total cooling difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, remaining average cooling rate deviation, and real-time cooling rate, including:

[0065] Calculate the total cooling temperature difference and average cooling rate based on the preset starting temperature, preset ending temperature, and preset total cooling time. Calculate the current average cooling rate, remaining cooling time, remaining average cooling rate, and remaining average cooling rate deviation based on the real-time temperature inside the chamber and the real-time cooling time. Calculate the real-time cooling rate based on the real-time temperature inside the chamber and the preset sampling period.

[0066] Specifically, the total cooling temperature difference and the average cooling rate are calculated using the following formulas:

[0067] In the formula, For the total cooling temperature difference, To preset the starting temperature, To preset the final temperature, To preset the total cooling time, This represents the average cooling rate.

[0068] The following formulas are used to calculate the current average cooling rate, remaining cooling time, remaining average cooling rate, and deviation of remaining average cooling rate:

[0069] In the formula, This refers to the real-time temperature inside the chamber. For real-time cooling time, This represents the current average cooling rate. For the remaining time to cool down, The remaining average cooling rate is the temperature reduction rate. The remaining average cooling rate deviation.

[0070] The real-time cooling rate is calculated using the following formula:

[0071] In the formula, For real-time cooling rate, For the preset sampling period, This represents the real-time temperature inside the chamber at the current sampling moment. This represents the real-time temperature inside the chamber at the previous sampling time.

[0072] S130. Based on the preset parameters and the total cooling temperature difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, remaining average cooling rate deviation, and real-time cooling rate, calculate the variable frequency compressor speed, electronic expansion valve opening, evaporator fan speed, and condenser fan speed of the controlled environment test chamber.

[0073] Optionally, based on preset parameters and the total cooling temperature difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, remaining average cooling rate deviation, and real-time cooling rate, the variable frequency compressor speed, electronic expansion valve opening, evaporator fan speed, and condenser fan speed of the controlled environment test chamber are calculated respectively, including:

[0074] The variable frequency compressor speed control deviation is calculated based on the preset starting temperature, preset ending temperature, real-time cooling time, remaining cooling time, remaining average cooling rate, current average cooling rate, average cooling rate, and preset variable frequency compressor speed control deviation coefficient.

[0075] The variable frequency compressor speed is calculated based on the variable frequency compressor speed control deviation and the preset variable frequency compressor speed control proportional coefficient, preset variable frequency compressor speed control integral coefficient, and preset variable frequency compressor speed control derivative coefficient.

[0076] Among them, the preset variable frequency compressor speed control deviation coefficient, the preset variable frequency compressor speed control proportional coefficient, the preset variable frequency compressor speed control integral coefficient, and the preset variable frequency compressor speed control derivative coefficient can all be preset according to requirements or experience values.

[0077] Specifically, the variable frequency compressor speed control deviation and the variable frequency compressor speed are calculated using the following formulas:

[0078] ;

[0079] In the formula, For the speed control deviation of the variable frequency compressor, , , and All are preset variable frequency compressor speed control deviation equity coefficients. To preset the starting temperature, To preset the final temperature, The average cooling rate, For real-time cooling time, This represents the current average cooling rate. For the remaining time to cool down, The remaining average cooling rate is the temperature reduction rate. , and These are the preset proportional coefficient, preset integral coefficient, and preset derivative coefficient for variable frequency compressor speed control, respectively. This refers to the rotational speed of the variable frequency compressor.

[0080] The electronic expansion valve opening control deviation is calculated based on the preset starting temperature, preset ending temperature, real-time cooling time, remaining cooling time, remaining average cooling rate deviation, average cooling rate, real-time temperature inside the chamber, real-time cooling rate, and preset electronic expansion valve opening control deviation equity coefficient.

[0081] The opening degree of the electronic expansion valve is calculated based on the control deviation of the electronic expansion valve opening degree and the preset proportional coefficient, integral coefficient, and derivative coefficient of the electronic expansion valve opening degree.

[0082] Among them, the preset electronic expansion valve opening control deviation coefficient, the preset electronic expansion valve opening control proportional coefficient, the preset electronic expansion valve opening control integral coefficient, and the preset electronic expansion valve opening control differential coefficient can all be preset according to requirements or experience values.

[0083] Specifically, the electronic expansion valve opening control deviation and the electronic expansion valve opening are calculated using the following formulas:

[0084] In the formula, For deviation in the opening control of the electronic expansion valve, , , and All are preset electronic expansion valve opening control deviation coefficients. To preset the starting temperature, To preset the final temperature, The average cooling rate, For real-time cooling time, For the remaining time to cool down, To preset the total cooling time, The remaining average cooling rate deviation. For real-time cooling rate, , and These are the preset proportional coefficient, preset integral coefficient, and preset derivative coefficient for electronic expansion valve opening control, respectively. This refers to the opening degree of the electronic expansion valve.

[0085] The evaporator fan speed control deviation is calculated based on the preset start temperature, preset end temperature, real-time cooling time, remaining average cooling rate, average cooling rate, real-time temperature inside the chamber, real-time cooling rate, variable frequency compressor speed, electronic expansion valve opening, and preset evaporator fan speed control deviation equity coefficient.

[0086] The evaporator fan speed is calculated based on the evaporator fan speed control deviation and the preset evaporator fan speed control proportional coefficient, preset evaporator fan speed control integral coefficient, and preset evaporator fan speed control differential coefficient.

[0087] Among them, the preset evaporator fan speed control deviation coefficient, preset evaporator fan speed control proportional coefficient, preset evaporator fan speed control integral coefficient, and preset evaporator fan speed control differential coefficient can all be preset according to requirements or experience values.

[0088] Specifically, the evaporator fan speed control deviation and the evaporator fan speed are calculated using the following formulas:

[0089] In the formula, The deviation is due to the evaporator fan speed control error. , , and All are preset evaporator fan speed control deviation equity coefficients. This refers to the real-time temperature inside the chamber. To preset the starting temperature, To preset the final temperature, The average cooling rate, For real-time cooling time, For real-time cooling rate, The remaining average cooling rate is the temperature reduction rate. This refers to the speed of the variable frequency compressor. For the opening degree of the electronic expansion valve, , and These are the preset proportional coefficient, preset integral coefficient, and preset derivative coefficient for evaporator fan speed control, respectively. This refers to the evaporator fan speed.

[0090] The condenser fan speed control deviation is calculated based on the preset start temperature, preset end temperature, real-time cooling time, current average cooling rate, average cooling rate, real-time cooling rate, variable frequency compressor speed, electronic expansion valve opening, and preset condenser fan speed control deviation equity coefficient.

[0091] The condenser fan speed is calculated based on the condenser fan speed control deviation and the preset condenser fan speed control proportional coefficient, preset condenser fan speed control integral coefficient, and preset condenser fan speed control differential coefficient.

[0092] Among them, the preset condenser fan speed control deviation coefficient, preset condenser fan speed control proportional coefficient, preset condenser fan speed control integral coefficient, and preset condenser fan speed control differential coefficient can all be preset according to requirements or experience values.

[0093] Specifically, the condenser fan speed control deviation and the condenser fan speed are calculated using the following formulas:

[0094] In the formula, For condenser fan speed control deviation, , , and All are preset condenser fan speed control deviation equity coefficients. To preset the starting temperature, To preset the final temperature, The average cooling rate, For real-time cooling time, For real-time cooling rate, This represents the current average cooling rate. This refers to the speed of the variable frequency compressor. For the opening degree of the electronic expansion valve, , and These are the preset proportional coefficient, preset integral coefficient, and preset derivative coefficient for condenser fan speed control, respectively. This refers to the evaporator fan speed.

[0095] This step, which calculates the control deviations of the variable frequency compressor speed, electronic expansion valve opening, evaporator fan speed, and condenser fan speed respectively, is the core premise and key design of this invention to achieve "precise control of four actuators in a coordinated manner." Essentially, it involves customizing the most suitable control input signal for each actuator based on its physical characteristics, control responsibilities, and dynamic response patterns, thereby solving the industry problem that "a single deviation cannot adapt to the coordinated operation of multiple actuators." Forcing the use of a single universal deviation to control four actuators not only fails to improve control accuracy but also leads to system oscillations, a surge in energy consumption, shortened equipment lifespan, and even the inability to achieve time-controllable nonlinear cooling. This step precisely calculates the variable frequency compressor speed to match the compressor's cooling capacity with the required cooling capacity, reducing system energy consumption; and precisely calculates the evaporator fan speed and condenser fan speed to reduce fan energy consumption while simultaneously improving system operational reliability.

[0096] S140. Based on the speed of the variable frequency compressor, the opening degree of the electronic expansion valve, the speed of the evaporator fan, and the speed of the condenser fan, the operation of the variable frequency compressor, the electronic expansion valve, the evaporator fan, and the condenser fan of the test chamber under control is controlled respectively to achieve nonlinear cooling control of the test chamber under control.

[0097] Specifically, the data acquisition and calculation control module sends the calculated variable frequency compressor speed to the compressor speed control module, the electronic expansion valve opening degree to the electronic expansion valve opening degree control module, the evaporator fan speed to the evaporator fan speed control module, and the condenser fan speed to the condenser fan speed control module. Through the compressor speed control module, the electronic expansion valve opening degree control module, and the evaporator fan speed control module, the variable frequency compressor, the electronic expansion valve, the evaporator fan, and the condenser fan are respectively controlled to operate according to the corresponding calculated parameters, thereby achieving time-controllable nonlinear cooling process.

[0098] The technical solution provided by this invention obtains the real-time temperature and real-time cooling time inside the controlled environment test chamber; based on the real-time temperature, real-time cooling time, and preset parameters, it calculates the total cooling temperature difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, remaining average cooling rate deviation, and real-time cooling rate; and based on the preset parameters and the total cooling temperature difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, and remaining average cooling rate deviation, it calculates the real-time cooling rate. Rate deviation and real-time cooling rate are calculated for the variable frequency compressor speed, electronic expansion valve opening, evaporator fan speed, and condenser fan speed of the controlled environment test chamber. Based on the variable frequency compressor speed, electronic expansion valve opening, evaporator fan speed, and condenser fan speed, the operation of the variable frequency compressor, electronic expansion valve, evaporator fan, and condenser fan of the controlled environment test chamber is controlled to achieve nonlinear cooling control of the controlled environment test chamber. This makes the nonlinear cooling time controllable, while reducing system energy consumption and improving system reliability.

[0099] Figure 3 This is a schematic diagram of a nonlinear cooling control device for an environmental test chamber provided in an embodiment of the present invention. (See attached diagram.) Figure 3 The device includes: an acquisition module 210, a first calculation module 220, a second calculation module 230, and a control module 240.

[0100] The acquisition module 210 is used to acquire the real-time temperature and real-time cooling time inside the controlled environment test chamber.

[0101] The first calculation module 220 is used to calculate the total cooling temperature difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, remaining average cooling rate deviation, and real-time cooling rate based on the real-time temperature inside the chamber, the real-time cooling time, and preset parameters.

[0102] The second calculation module 230 is used to calculate the variable frequency compressor speed, electronic expansion valve opening, evaporator fan speed and condenser fan speed of the controlled environment test chamber according to preset parameters and total cooling temperature difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, remaining average cooling rate deviation and real-time cooling rate.

[0103] The control module 240 is used to control the operation of the variable frequency compressor, electronic expansion valve, evaporator fan and condenser fan of the test chamber under test according to the speed of the variable frequency compressor, the opening degree of the electronic expansion valve, the speed of the evaporator fan and the speed of the condenser fan, so as to realize the nonlinear cooling control of the test chamber under test.

[0104] The nonlinear cooling control device for an environmental test chamber provided in this embodiment of the invention can execute the nonlinear cooling control method for an environmental test chamber provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0105] This invention also provides an environmental test chamber, including a chamber body, a control system, and a refrigeration system;

[0106] See Figure 2 The refrigeration system includes a variable frequency compressor, 2, a condenser, 3, a condenser fan, 4, an electronic expansion valve, 5, an evaporator, 6, and an evaporator fan.

[0107] The control system includes an internal temperature sensor 1, an evaporator fan speed control module 8, a compressor speed control module 9, an electronic expansion valve opening control module 10, a condenser fan speed control module 11, and a data acquisition and calculation control module 12.

[0108] The internal temperature sensor 1 is electrically connected to the data acquisition and calculation control module 12, the variable frequency compressor 2 is electrically connected to the compressor speed control module 9, the electronic expansion valve 5 is electrically connected to the electronic expansion valve opening control module 10, the evaporator fan 7 is electrically connected to the evaporator fan speed control module 8, and the condenser fan 4 is electrically connected to the condenser fan speed control module 11.

[0109] The variable frequency compressor 2, condenser 3, electronic expansion valve 5 and evaporator 6 are connected in series to form a circuit.

[0110] The environmental test chamber provided in this embodiment of the invention includes a nonlinear cooling control device for the environmental test chamber, which has the same beneficial effects as the nonlinear cooling control device for the environmental test chamber.

[0111] Figure 4 This is a schematic diagram of the electronic device used in an embodiment of the nonlinear cooling control method for an environmental test chamber provided by the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0112] like Figure 4 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 and a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded into the RAM 13 from storage unit 18. The RAM 13 can also store various programs and data required for the operation of the electronic device 10. The processor 11, the ROM 12, and the RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0113] Multiple components in electronic device 10 are connected to input / output I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of monitors, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0114] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, central processing unit (CPU), graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as a nonlinear cooling control method for an environmental test chamber.

[0115] In some embodiments, the nonlinear cooling control method for the environmental test chamber can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on electronic device 10 via read-only memory ROM 12 and / or communication unit 19. When the computer program is loaded into random access memory RAM 13 and executed by processor 11, one or more steps of the nonlinear cooling control method for the environmental test chamber described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to perform the nonlinear cooling control method for the environmental test chamber in any other suitable manner.

[0116] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transferring data and instructions to the storage system, the at least one input device, and the at least one output device.

[0117] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0118] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0119] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device for displaying information to a user; and a keyboard and pointing device through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with a user; for example, feedback provided to the user can be any form of sensory feedback; and input from the user can be received in any form.

[0120] The systems and technologies described herein can be implemented in computing systems that include backend components, middleware components, or frontend components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium. Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0121] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0122] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0123] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A nonlinear cooling control method for an environmental test chamber, characterized in that, include: Obtain the real-time temperature and cooling time inside the controlled environment test chamber; Based on the real-time temperature inside the chamber, the real-time cooling time, and preset parameters, calculate the total cooling temperature difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, remaining average cooling rate deviation, and real-time cooling rate. Based on the preset parameters and the total cooling temperature difference, the average cooling rate, the current average cooling rate, the remaining cooling time, the remaining average cooling rate, the remaining average cooling rate deviation, and the real-time cooling rate, the variable frequency compressor speed, electronic expansion valve opening, evaporator fan speed, and condenser fan speed of the controlled environment test chamber are calculated respectively. The variable frequency compressor speed, the electronic expansion valve opening, the evaporator fan speed, and the condenser fan speed are used to control the operation of the variable frequency compressor, electronic expansion valve, evaporator fan, and condenser fan of the controlled environment test chamber, respectively, so as to achieve nonlinear cooling control of the controlled environment test chamber.

2. The method according to claim 1, characterized in that, The preset parameters include preset starting temperature, preset ending temperature, preset total cooling time, and preset sampling period. Based on the real-time temperature inside the chamber, the real-time cooling time, and preset parameters, the total cooling temperature difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, remaining average cooling rate deviation, and real-time cooling rate are calculated respectively, including: Calculate the total cooling temperature difference and average cooling rate based on the preset starting temperature, preset ending temperature and preset total cooling time; Based on the real-time temperature inside the chamber and the real-time cooling time, calculate the current average cooling rate, the remaining cooling time, the remaining average cooling rate, and the deviation of the remaining average cooling rate. The real-time cooling rate is calculated based on the real-time temperature inside the chamber and the preset sampling period.

3. The method according to claim 2, characterized in that, The total cooling temperature difference and average cooling rate are calculated using the following formulas: In the formula, For the total cooling temperature difference, To preset the starting temperature, To preset the final temperature, To preset the total cooling time, The average cooling rate; The following formulas are used to calculate the current average cooling rate, remaining cooling time, remaining average cooling rate, and deviation of remaining average cooling rate: In the formula, This refers to the real-time temperature inside the chamber. For real-time cooling time, This represents the current average cooling rate. For the remaining time to cool down, The remaining average cooling rate is the temperature reduction rate. The remaining average cooling rate deviation; The real-time cooling rate is calculated using the following formula: In the formula, For real-time cooling rate, For the preset sampling period, This represents the real-time temperature inside the chamber at the current sampling moment. This represents the real-time temperature inside the chamber at the previous sampling time.

4. The method according to claim 2, characterized in that, Based on the preset parameters and the total cooling temperature difference, the average cooling rate, the current average cooling rate, the remaining cooling time, the remaining average cooling rate, the remaining average cooling rate deviation, and the real-time cooling rate, the variable frequency compressor speed, electronic expansion valve opening, evaporator fan speed, and condenser fan speed of the controlled environment test chamber are calculated respectively, including: The variable frequency compressor speed control deviation is calculated based on the preset starting temperature, preset ending temperature, real-time cooling time, remaining cooling time, remaining average cooling rate, current average cooling rate, average cooling rate, and preset variable frequency compressor speed control deviation coefficient. The variable frequency compressor speed is calculated based on the variable frequency compressor speed control deviation and the preset variable frequency compressor speed control proportional coefficient, preset variable frequency compressor speed control integral coefficient, and preset variable frequency compressor speed control differential coefficient. The electronic expansion valve opening control deviation is calculated based on the preset starting temperature, preset ending temperature, real-time cooling time, remaining cooling time, remaining average cooling rate deviation, average cooling rate, real-time temperature inside the chamber, real-time cooling rate, and preset electronic expansion valve opening control deviation equity coefficient. The opening degree of the electronic expansion valve is calculated based on the electronic expansion valve opening degree control deviation and the preset electronic expansion valve opening degree control proportional coefficient, preset electronic expansion valve opening degree control integral coefficient, and preset electronic expansion valve opening degree control differential coefficient. The evaporator fan speed control deviation is calculated based on the preset start temperature, preset end temperature, real-time cooling time, remaining average cooling rate, average cooling rate, real-time temperature inside the chamber, real-time cooling rate, variable frequency compressor speed, electronic expansion valve opening, and preset evaporator fan speed control deviation equity coefficient. The evaporator fan speed is calculated based on the evaporator fan speed control deviation and the preset evaporator fan speed control proportional coefficient, preset evaporator fan speed control integral coefficient, and preset evaporator fan speed control differential coefficient. The condenser fan speed control deviation is calculated based on the preset start temperature, preset end temperature, real-time cooling time, current average cooling rate, average cooling rate, real-time cooling rate, variable frequency compressor speed, electronic expansion valve opening, and preset condenser fan speed control deviation equity coefficient. The condenser fan speed is calculated based on the condenser fan speed control deviation and the preset condenser fan speed control proportional coefficient, preset condenser fan speed control integral coefficient, and preset condenser fan speed control differential coefficient.

5. The method according to claim 4, characterized in that, The variable frequency compressor speed control deviation and the variable frequency compressor speed are calculated using the following formulas: ； In the formula, For the speed control deviation of the variable frequency compressor, , , and All are preset variable frequency compressor speed control deviation equity coefficients. To preset the starting temperature, To preset the final temperature, The average cooling rate, For real-time cooling time, This represents the current average cooling rate. For the remaining time to cool down, The remaining average cooling rate is the temperature reduction rate. , and These are the preset proportional coefficient, preset integral coefficient, and preset derivative coefficient for variable frequency compressor speed control, respectively. This refers to the rotational speed of the variable frequency compressor.

6. The method according to claim 4, characterized in that, The electronic expansion valve opening control deviation and the electronic expansion valve opening are calculated using the following formulas: In the formula, For deviation in the opening control of the electronic expansion valve, , , and All are preset electronic expansion valve opening control deviation equity coefficients. To preset the starting temperature, To preset the final temperature, The average cooling rate, For real-time cooling time, For the remaining time to cool down, To preset the total cooling time, The remaining average cooling rate deviation. For real-time cooling rate, , and These are the preset proportional coefficient, preset integral coefficient, and preset derivative coefficient for electronic expansion valve opening control, respectively. This refers to the opening degree of the electronic expansion valve.

7. The method according to claim 4, characterized in that, The evaporator fan speed control deviation and the evaporator fan speed are calculated using the following formulas: In the formula, The deviation is due to the evaporator fan speed control error. , , and All are preset evaporator fan speed control deviation equity coefficients. This refers to the real-time temperature inside the chamber. To preset the starting temperature, To preset the final temperature, The average cooling rate, For real-time cooling time, For real-time cooling rate, The remaining average cooling rate is the temperature reduction rate. This refers to the speed of the variable frequency compressor. For the opening degree of the electronic expansion valve, , and These are the preset proportional coefficient, preset integral coefficient, and preset derivative coefficient for evaporator fan speed control, respectively. This refers to the evaporator fan speed.

8. The method according to claim 4, characterized in that, The condenser fan speed control deviation and the condenser fan speed are calculated using the following formulas: In the formula, For condenser fan speed control deviation, , , and All are preset condenser fan speed control deviation equity coefficients. To preset the starting temperature, To preset the final temperature, The average cooling rate, For real-time cooling time, For real-time cooling rate, This represents the current average cooling rate. This refers to the speed of the variable frequency compressor. For the opening degree of the electronic expansion valve, , and These are the preset proportional coefficient, preset integral coefficient, and preset derivative coefficient for condenser fan speed control, respectively. This refers to the evaporator fan speed.

9. A nonlinear cooling control device for an environmental test chamber, characterized in that, The apparatus for performing the nonlinear cooling control method for an environmental test chamber as described in any one of claims 1-8 includes: The acquisition module is used to acquire the real-time temperature and real-time cooling time inside the controlled environment test chamber; The first calculation module is used to calculate the total cooling temperature difference, average cooling rate, current average cooling rate, remaining cooling time, remaining average cooling rate, remaining average cooling rate deviation, and real-time cooling rate based on the real-time temperature inside the box, the real-time cooling time, and preset parameters. The second calculation module is used to calculate the variable frequency compressor speed, electronic expansion valve opening, evaporator fan speed and condenser fan speed of the controlled environment test chamber according to the preset parameters and the total cooling temperature difference, the average cooling rate, the current average cooling rate, the remaining cooling time, the remaining average cooling rate, the remaining average cooling rate deviation and the real-time cooling rate, respectively. The control module is used to control the operation of the variable frequency compressor, electronic expansion valve, evaporator fan and condenser fan of the test chamber under test according to the speed of the variable frequency compressor, the opening degree of the electronic expansion valve, the speed of the evaporator fan and the speed of the condenser fan, so as to realize the nonlinear cooling control of the test chamber under test.

10. An environmental test chamber, characterized in that, Includes the enclosure, control system, and refrigeration system; The refrigeration system includes a variable frequency compressor, a condenser, a condenser fan, an electronic expansion valve, an evaporator, and an evaporator fan; The control system includes an internal temperature sensor, an evaporator fan speed control module, a compressor speed control module, an electronic expansion valve opening control module, a condenser fan speed control module, and a data acquisition and calculation control module. The internal temperature sensor is electrically connected to the acquisition and calculation control module; the variable frequency compressor is electrically connected to the compressor speed control module; the electronic expansion valve is electrically connected to the electronic expansion valve opening control module; the evaporator fan is electrically connected to the evaporator fan speed control module; and the condenser fan is electrically connected to the condenser fan speed control module. The variable frequency compressor, the condenser, the electronic expansion valve, and the evaporator are connected in series to form a circuit.

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