Temperature control method and device of environmental test chamber and environmental test chamber

Abstract

The application discloses a temperature control method and device of an environmental test chamber and the environmental test chamber. The temperature control method comprises the following steps: acquiring compressor parameter information, set temperature information and current temperature information of the environmental test chamber, throttling element parameter information and evaporator operation information; determining a linear cooling rate according to the set temperature information; respectively determining a compressor adjustment rotating speed, a throttling element adjustment opening degree, an evaporator fan adjustment rotating speed and a condenser fan adjustment rotating speed according to the linear cooling rate, a set starting temperature, the current temperature information, the compressor parameter information, the throttling element parameter information and the evaporator operation information; and adjusting the rotating speed of the compressor to the compressor adjustment rotating speed and the opening degree of the throttling element to the throttling element adjustment opening degree. The application can accurately control the temperature in the environmental test chamber, improve the operation reliability of the environmental test chamber, and reduce the operation energy consumption of the refrigeration system in the environmental test chamber.

Description

Technical Field

[0001] This invention relates to the field of temperature control technology for test chambers, and in particular to a temperature control method, device, and environmental test chamber for an environmental test 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] During linear cooling, the cooling capacity demand increases as the temperature decreases. Furthermore, as the temperature drops, the evaporation temperature also needs to decrease. When the condensation temperature is constant, the compressor's cooling capacity decreases as the evaporation temperature decreases. Therefore, the compressor's capacity varies significantly from the start to the end of linear cooling.

[0004] Currently, compressors are selected based on the maximum cooling capacity required during linear cooling, which results in high overall compressor energy consumption during this process. Therefore, optimizing the control and operation of the refrigeration system during linear cooling is crucial for improving the reliability of the refrigeration system and reducing its energy consumption. Summary of the Invention

[0005] This invention provides a temperature control method, device, and environmental test chamber for an environmental test chamber, which can accurately control the temperature inside the environmental test chamber, reduce the energy consumption of the refrigeration system, and improve the operational reliability of the environmental test chamber.

[0006] According to one aspect of the present invention, a temperature control method for an environmental test chamber is provided, the environmental test chamber comprising a refrigeration system, the refrigeration system comprising a compressor, a throttling element, an evaporator, an evaporator fan, a condenser, and a condenser fan;

[0007] The temperature control method includes:

[0008] The system acquires compressor parameter information, the set temperature information and current temperature information of the environmental test chamber, throttling element parameter information, and evaporator operating information; wherein, the set temperature information includes the set start temperature, the set end temperature, and the set cooling time;

[0009] The linear cooling rate is determined based on the set temperature information;

[0010] The compressor adjustment speed, throttling element adjustment opening, evaporator fan adjustment speed, and condenser fan adjustment speed are determined based on the linear cooling rate, the set starting temperature, the current temperature information, the compressor parameter information, the throttling element parameter information, and the evaporator operating information, respectively.

[0011] The compressor speed is adjusted to the compressor adjustment speed, the throttling element opening is adjusted to the throttling element adjustment opening, the evaporator fan speed is adjusted to the evaporator fan adjustment speed, and the condenser fan speed is adjusted to the condenser fan adjustment speed.

[0012] Optionally, determining the compressor adjustment speed, throttling element adjustment opening, evaporator fan adjustment speed, and condenser fan adjustment speed based on the linear cooling rate, the set starting temperature, the current temperature information, the compressor parameter information, the throttling element parameter information, and the evaporator operating information, respectively, includes:

[0013] The compressor adjustment speed is determined based on the linear cooling rate, the set starting temperature, the current temperature information, and the compressor parameter information.

[0014] The adjustment degree of the throttling element is determined based on the linear cooling rate, the set starting temperature, the current temperature information, and the throttling element parameter information.

[0015] The evaporator fan speed is adjusted based on the current temperature information and the evaporator operating information.

[0016] The condenser fan speed is determined based on the compressor adjustment speed, the linear cooling rate, and the compressor parameter information.

[0017] Optionally, the compressor parameter information includes: compressor suction pressure, compressor speed control reference suction pressure, compressor discharge pressure, and compressor speed control reference discharge pressure; the throttling element parameter information includes a first equity coefficient and a second equity coefficient.

[0018] The step of determining the compressor adjustment speed based on the linear cooling rate, the set starting temperature, the current temperature information, and the compressor parameter information includes:

[0019] The current cooling rate is determined based on the current temperature information and the set starting temperature.

[0020] The rate deviation is determined based on the linear cooling rate and the current cooling rate;

[0021] The first operating condition deviation is determined based on the compressor suction pressure and the compressor speed control reference suction pressure.

[0022] The second operating condition deviation is determined based on the compressor discharge pressure and the compressor speed control reference discharge pressure.

[0023] The compressor speed control deviation is determined based on the rate deviation, the first operating condition deviation, and the second operating condition deviation.

[0024] The compressor adjustment speed is determined based on the compressor speed control deviation;

[0025] The step of determining the adjustment degree of the throttling element based on the linear cooling rate, the set starting temperature, the current temperature information, and the throttling element parameter information includes:

[0026] The throttling element opening control deviation is determined based on the linear cooling rate, the set starting temperature, the current temperature information, the first equity coefficient, and the second equity coefficient.

[0027] The adjustment degree of the throttling element is determined based on the control deviation of the throttling element opening.

[0028] Optionally, the evaporator operating information includes the evaporator inlet air temperature and evaporation temperature; the compressor parameter information includes the actual compression ratio and compressor suction pressure; and the current temperature information includes the current actual temperature.

[0029] The step of determining the evaporator fan speed adjustment based on the current temperature information and the evaporator operating information includes:

[0030] The first temperature deviation is determined based on the current actual temperature and the evaporator inlet air temperature.

[0031] The second temperature deviation is determined based on the evaporation temperature and the evaporator inlet air temperature.

[0032] The evaporator fan speed control deviation is determined based on the first temperature deviation and the second temperature deviation;

[0033] The evaporator fan adjustment speed is determined based on the evaporator fan speed control deviation.

[0034] Determining the condenser fan speed adjustment based on the compressor adjustment speed, the linear cooling rate, and the compressor parameter information includes:

[0035] The target compression ratio is determined based on the compressor suction pressure and the linear cooling rate.

[0036] The condenser fan speed control deviation is determined based on the target compression ratio, the actual compression ratio, and the compressor adjustment speed.

[0037] The condenser fan speed adjustment speed is determined based on the condenser fan speed control deviation.

[0038] Optionally, the current temperature information includes the current actual temperature and the current cooling duration;

[0039] The step of determining the compressor speed control deviation based on the rate deviation, the first operating condition deviation, and the second operating condition deviation includes:

[0040] The compressor speed control deviation is determined according to the following formula:

[0041]

[0042] Where e1(τ) is the compressor speed control deviation. The rate deviation is... This is the deviation from the first operating condition. V is the second operating condition deviation, τ is the linear cooling rate, T0 is the current cooling duration, T0 is the set starting temperature, T is the current actual temperature, LP is the compressor suction pressure, LP0 is the compressor speed control reference suction pressure, HP is the compressor discharge pressure, and HP0 is the compressor speed control reference discharge pressure.

[0043] The step of determining the compressor adjustment speed based on the compressor speed control deviation includes:

[0044] The compressor adjustment speed is determined according to the following formula:

[0045]

[0046] Wherein, F is the compressor adjustment speed, P1 is the first proportional coefficient, I1 is the first integral coefficient, and D1 is the first derivative coefficient;

[0047] The step of determining the throttling element opening control deviation based on the linear cooling rate, the set starting temperature, the current temperature information, the first equity coefficient, and the second equity coefficient includes:

[0048] The throttling element opening control deviation is determined according to the following formula:

[0049]

[0050] Where e2(τ) is the control deviation of the throttling element opening, E A E is the first equity coefficient. B This is the second equity coefficient;

[0051] The step of determining the adjustment opening of the throttling element based on the control deviation of the throttling element opening includes:

[0052] The adjustment degree of the throttling element is determined according to the following formula:

[0053]

[0054] Where E is the adjustment degree of the throttling element, P2 is the second proportional coefficient, I2 is the second integral coefficient, and D2 is the second differential coefficient.

[0055] Optionally, determining the evaporator fan speed control deviation based on the first temperature deviation and the second temperature deviation includes:

[0056] The evaporator fan speed control deviation is determined according to the following formula:

[0057]

[0058] Where e3(τ) is the evaporator fan speed control deviation. This is the first temperature deviation. The second temperature deviation is T8, where T is the evaporator inlet air temperature. EVA Where T is the evaporation temperature, and T is the current actual temperature;

[0059] The step of determining the evaporator fan adjustment speed based on the evaporator fan speed control deviation includes:

[0060] The evaporator fan adjustment speed is determined according to the following formula:

[0061]

[0062] Where A is the evaporator fan adjustment speed, P3 is the third proportional coefficient, I3 is the third integral coefficient, and D3 is the third differential coefficient;

[0063] The step of determining the condenser fan speed control deviation based on the target compression ratio, the actual compression ratio, and the compressor adjustment speed includes:

[0064] The condenser fan speed control deviation is determined according to the following formula:

[0065] e4(τ)=(PR-PR0)·(In(F+1)+0.5)

[0066] Wherein, e4(τ) is the condenser fan speed control deviation, PR is the actual compression ratio, PR0 is the target compression ratio, and F is the compressor adjustment speed;

[0067] The step of determining the condenser fan adjustment speed based on the condenser fan speed control deviation includes:

[0068] The adjustment speed of the condenser fan is determined according to the following formula:

[0069]

[0070] Wherein, C is the condenser fan adjustment speed, P4 is the fourth proportional coefficient, I4 is the fourth integral coefficient, and D4 is the fourth differential coefficient.

[0071] According to another aspect of the present invention, a temperature control device for an environmental test chamber is provided, the environmental test chamber including a refrigeration system, the refrigeration system including a compressor, a throttling element, an evaporator, an evaporator fan, a condenser and a condenser fan;

[0072] The temperature control device includes an acquisition module, a determination module, and a control module;

[0073] The acquisition module is used to acquire compressor parameter information, the set temperature information and current temperature information of the environmental test chamber, the throttling element parameter information, and the evaporator operation information; wherein, the set temperature information includes the set start temperature, the set end temperature, and the set cooling time;

[0074] The determining module is used to determine the linear cooling rate based on the set temperature information, and is also used to determine the compressor adjustment speed, the throttling element adjustment opening, the evaporator fan adjustment speed, and the condenser fan adjustment speed based on the linear cooling rate, the set starting temperature, the current temperature information, the compressor parameter information, the throttling element parameter information, and the evaporator operating information, respectively.

[0075] The control module is used to adjust the speed of the compressor to the adjusted speed of the compressor, the opening degree of the throttling element to the adjusted opening degree of the throttling element, the speed of the evaporator fan to the adjusted speed of the evaporator fan, and the speed of the condenser fan to the adjusted speed of the condenser fan.

[0076] Optionally, the control module includes a compressor speed control submodule, a throttling element opening degree control submodule, an evaporator fan speed control submodule, and a condenser fan speed control submodule;

[0077] The compressor speed control submodule is used to adjust the compressor speed to the compressor adjustment speed;

[0078] The throttling element opening control submodule is used to adjust the opening of the throttling element to the adjusted opening of the throttling element;

[0079] The evaporator fan speed control submodule is used to adjust the speed of the evaporator fan to the evaporator fan adjustment speed;

[0080] The condenser fan speed control submodule is used to adjust the speed of the condenser fan to the condenser fan adjustment speed.

[0081] Optionally, the compressor parameter information includes compressor suction pressure and compressor discharge pressure; the evaporator operating information includes evaporator inlet air temperature; and the current temperature information includes the current actual temperature.

[0082] The acquisition module includes a compressor suction pressure sensor, a compressor discharge pressure sensor, an evaporator inlet air temperature sensor, and an internal temperature sensor.

[0083] The compressor suction pressure sensor is used to acquire the compressor suction pressure;

[0084] The compressor discharge pressure sensor is used to obtain the compressor discharge pressure;

[0085] The evaporator inlet air temperature sensor is used to obtain the evaporator inlet air temperature;

[0086] The internal temperature sensor is used to obtain the current actual temperature.

[0087] According to another aspect of the present invention, an environmental test chamber is provided, which includes a temperature control device for the environmental test chamber provided in any embodiment of the present invention.

[0088] This invention provides a temperature control method for an environmental test chamber. This method controls the compressor speed, throttling element opening, evaporator fan speed, and condenser fan speed based on the linear cooling rate, set initial temperature, current temperature information, compressor parameter information, throttling element parameter information, and evaporator operating information. This ensures that the cooling capacity generated by the refrigeration system matches the required cooling capacity within the environmental test chamber, resulting in a more linear cooling curve within the chamber. This improves the reliability of the environmental test chamber and reduces the power consumption of the compressor, evaporator fan, and condenser fan, thereby lowering the overall power consumption of the refrigeration system within the chamber. In summary, the temperature control method for an environmental test chamber provided by this invention can accurately control the temperature within the chamber, improve operational reliability, and reduce the energy consumption of the refrigeration system.

[0089] 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

[0090] 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.

[0091] Figure 1 This is a structural schematic diagram of an environmental test chamber provided according to an embodiment of the present invention;

[0092] Figure 2 This is a schematic flowchart of a temperature control method for an environmental test chamber according to an embodiment of the present invention;

[0093] Figure 3 This is a schematic flowchart of another temperature control method for an environmental test chamber provided according to an embodiment of the present invention;

[0094] Figure 4 This is a schematic diagram of the structure of a temperature control device for an environmental test chamber according to an embodiment of the present invention;

[0095] Figure 5 This is a structural schematic diagram of a temperature control device for an environmental test chamber according to an embodiment of the present invention;

[0096] Figure 6 This is a structural schematic diagram of another environmental test chamber provided according to an embodiment of the present invention. Detailed Implementation

[0097] 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.

[0098] 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.

[0099] Figure 1 This is a structural schematic diagram of an environmental test chamber according to an embodiment of the present invention, with reference to... Figure 1 The environmental test chamber provided in this embodiment includes a refrigeration system and a chamber body. The refrigeration system is used to adjust the temperature inside the chamber. The refrigeration system includes a compressor 110, a throttling element 120, an evaporator 130, an evaporator fan 140, a condenser 150, and a condenser fan 160. The throttling element 120 can be an electronic expansion valve or other adjustable throttling element. The chamber body is mainly composed of thermal insulation material. The compressor 110 can be a variable frequency compressor.

[0100] This invention provides a temperature control method for an environmental test chamber. By precisely controlling the speed of the compressor 110, the opening degree of the throttling element 120, the speed of the evaporator fan 140, and the speed of the condenser fan 160 in the environmental test chamber, the cooling capacity generated by the refrigeration system is matched with the cooling demand of the environmental test chamber, thereby reducing the energy consumption of the refrigeration system and improving the reliability of the refrigeration system.

[0101] Figure 2 This is a schematic flowchart of a temperature control method for an environmental test chamber according to an embodiment of the present invention. (Refer to...) Figure 2 The temperature control method provided in this embodiment includes the following steps:

[0102] S110: Obtain compressor parameter information, environmental test chamber set temperature information and current temperature information, throttling element parameter information and evaporator operation information.

[0103] The set temperature information includes the set start temperature, the set end temperature, and the set cooling time.

[0104] Specifically, compressor parameter information may include operating parameters during compressor operation and set compressor-related parameters. Throttling element parameter information may include information related to controlling the opening degree of the throttling element. Evaporator operating information may include operating parameters during evaporator operation.

[0105] The set start temperature refers to the temperature at which the environmental test chamber begins testing. The set end temperature refers to the temperature at which the environmental test chamber completely ends testing. The set cooling time refers to the total time it takes for the environmental test chamber to cool from the set start temperature to the set end temperature. The set start temperature, set end temperature, and set cooling time can be set according to actual needs. The set start temperature must be greater than the set end temperature. The current temperature information refers to the temperature of the environmental test chamber during the testing process.

[0106] S120. Determine the linear cooling rate based on the set temperature information.

[0107] Specifically, the linear cooling rate can be determined by the ratio of the difference between the set starting temperature and the set ending temperature to the set cooling time. The linear cooling rate refers to a fixed rate of temperature change that can be guaranteed within any given time period. The linear cooling rate is a key technical parameter in environmental test chambers, ensuring a constant cooling rate over any given time period, which is crucial for achieving precise temperature control and simulating environmental conditions. The linear cooling rate can also be understood as the target cooling rate, a cooling rate value required to achieve the actual cooling rate of the environmental test chamber.

[0108] S130. Based on the linear cooling rate, set starting temperature, current temperature information, compressor parameter information, throttling element parameter information, and evaporator operating information, determine the compressor adjustment speed, throttling element adjustment opening, evaporator fan adjustment speed, and condenser fan adjustment speed, respectively.

[0109] Specifically, the compressor speed is related to the cooling capacity of the environmental test chamber. The higher the compressor speed, the greater the refrigerant flow rate compressed per unit time, and the stronger the cooling capacity of the refrigeration system. During the linear cooling process of the environmental test chamber, the required cooling capacity varies at different times. Therefore, this embodiment controls the cooling capacity within the environmental test chamber by controlling the compressor speed, ensuring that the compressor's cooling capacity matches the required cooling capacity. This avoids maintaining a fixed compressor speed during the cooling process, which would increase the compressor's power consumption.

[0110] The throttling element can adjust the flow rate of refrigerant in the environmental test chamber. The flow rate of refrigerant affects the temperature inside the environmental test chamber. Therefore, in this embodiment, the temperature of the environmental test chamber is further controlled by adjusting the opening of the throttling element to ensure the reliability of the refrigeration system.

[0111] The evaporator is a key component of the refrigeration system, responsible for absorbing heat and causing the refrigerant to evaporate, thereby lowering the temperature inside the environmental test chamber. The evaporator fan forces air to flow across the evaporator fins, promoting heat exchange and delivering cool air into the environmental test chamber while ensuring uniform temperature distribution. Therefore, the evaporator fan speed can affect the cooling capacity within the environmental test chamber. This embodiment controls the cooling capacity within the environmental test chamber by controlling the evaporator fan speed, thus avoiding the increased power consumption of the evaporator fan due to its constant rotational speed during cooling, and also preventing insufficient airflow from the evaporator fan from affecting the reliability and cooling capacity of the refrigeration system.

[0112] In the refrigeration system of the environmental test chamber, the compressor compresses the gaseous refrigerant to a high-temperature, high-pressure state and then sends it to the condenser. At this time, the condenser fan accelerates the release of heat from the refrigerant to the outside environment through forced air convection, causing it to condense from a gaseous state into a liquid state, providing the necessary conditions for cooling. The rotational speed of the condenser fan affects the airflow generated by the condenser fan, and the airflow of the condenser fan affects the cooling rate of the environmental test chamber. Therefore, this embodiment can regulate the temperature of the environmental test chamber and control the energy consumption of the condenser fan by precisely controlling the rotational speed of the condenser fan.

[0113] This embodiment determines the compressor speed adjustment, throttling element adjustment degree, evaporator fan speed adjustment, and condenser fan speed adjustment based on the linear cooling rate, set starting temperature, current temperature information, compressor parameter information, throttling element parameter information, and evaporator operating information. This allows for precise control of the temperature inside the environmental test chamber, ensuring the reliability of the environmental test chamber's operation. It also reduces the power consumption of the compressor, evaporator fan, and condenser fan, thereby reducing the energy consumption of the refrigeration system.

[0114] S140. Adjust the compressor speed to the compressor adjustment speed, adjust the throttling element opening to the throttling element adjustment opening, adjust the evaporator fan speed to the evaporator fan adjustment speed, and adjust the condenser fan speed to the condenser fan adjustment speed.

[0115] Specifically, after determining the compressor speed, throttling element opening, evaporator fan speed, and condenser fan speed, adjust the compressor speed, throttling element opening, evaporator fan speed, and condenser fan speed to the corresponding determined values. This ensures that the cooling capacity generated by the refrigeration system matches the cooling requirements of the environmental test chamber, improves the temperature control accuracy of the environmental test chamber, makes the linear cooling curve of the environmental test chamber closer to linear, and also reduces the power consumption of the refrigeration system.

[0116] This embodiment provides a temperature control method for an environmental test chamber. This method controls the compressor speed, the opening degree of the throttling element, the evaporator fan speed, and the condenser fan speed based on the linear cooling rate, the set starting temperature, the current temperature information, compressor parameter information, throttling element parameter information, and evaporator operating information. This ensures that the cooling capacity generated by the refrigeration system matches the required cooling capacity within the environmental test chamber, resulting in a more linear cooling curve within the chamber. This guarantees the reliability of the environmental test chamber and reduces the power consumption of the compressor, evaporator fan, and condenser fan, thereby lowering the overall power consumption of the refrigeration system within the environmental test chamber. In summary, the temperature control method for an environmental test chamber provided in this embodiment can accurately control the temperature within the chamber, improve the operational reliability of the environmental test chamber, and reduce the energy consumption of the refrigeration system within the chamber.

[0117] Optional, Figure 3 This is a flowchart illustrating another method for temperature control in an environmental test chamber according to an embodiment of the present invention. (Refer to...) Figure 3 The temperature control method for the environmental test chamber provided in this embodiment includes the following steps:

[0118] S210: Obtain compressor parameter information, environmental test chamber set temperature information and current temperature information, throttling element parameter information and evaporator operation information.

[0119] Step S210 is identical to step S110. For a detailed description of step S210, please refer to the description of step S110. It will not be repeated here.

[0120] S220: Determine the linear cooling rate based on the set temperature information.

[0121] Step S220 is identical to step S120. For a detailed description of step S220, please refer to the description of step S120. It will not be repeated here.

[0122] S230: Determine the compressor adjustment speed based on the linear cooling rate, set starting temperature, current temperature information, and compressor parameter information.

[0123] Specifically, this embodiment determines the compressor adjustment speed based on the linear cooling rate, the set starting temperature, and the current temperature information. That is, it precisely adjusts the compressor speed according to the actual temperature information inside the environmental test chamber and the set temperature information, thereby matching the cooling capacity generated by the refrigeration system with the cooling capacity required by the environmental test chamber, thus reducing the compressor's operating power consumption. Simultaneously, determining the compressor adjustment speed based on compressor parameter information ensures that the compressor's operating conditions are within a reasonable range, extending the compressor's service life.

[0124] S240: Determine the opening degree of the throttling element based on the linear cooling rate, the set starting temperature, the current temperature information, and the throttling element parameter information.

[0125] Specifically, based on the actual temperature information, set temperature information, and throttling element parameter information inside the environmental test chamber, the adjustment degree of the throttling element can be accurately determined. This allows the adjusted throttling element to match the cooling capacity generated by the refrigeration system with the cooling capacity required by the environmental test chamber, thereby improving the reliability of the environmental test chamber.

[0126] S250. Determine the evaporator fan speed adjustment based on the current temperature information and evaporator operating information.

[0127] Specifically, evaporator operating information can include temperature-related information during evaporator operation. Based on the current temperature information and evaporator operating information within the environmental test chamber, the evaporator fan speed can be precisely determined. This allows the airflow generated by the adjusted evaporator fan to match the cooling capacity of the refrigeration system with the cooling capacity required by the environmental test chamber, improving the reliability of the environmental test chamber and reducing the power consumption of the evaporator fan.

[0128] S260. Determine the condenser fan speed based on the compressor adjustment speed, linear cooling rate, and compressor parameter information.

[0129] Specifically, the compressor compresses the refrigerant after the evaporator and then sends it to the condenser. The condenser fan helps dissipate heat, allowing the refrigerant to condense. If the condenser fan malfunctions, insufficient heat dissipation will lead to increased condensing pressure. This will increase the compressor's workload, power consumption, and may even cause overheating protection shutdown. Conversely, insufficient condensing pressure may affect the condensing effect, and the condenser fan may need to adjust its speed to adapt. It is evident that the condenser fan and compressor have a strong coupling relationship in the refrigeration system, and their coordinated operation directly affects the refrigeration system's efficiency, energy consumption, and reliability. This embodiment determines the condenser fan adjustment speed based on the compressor's adjustment speed, linear cooling rate, and compressor parameter information. This ensures that the adjusted condenser fan speed matches the compressor's operating state, guaranteeing normal operation of the refrigeration system while matching the cooling capacity generated by the system with the cooling capacity required by the environmental test chamber, thus reducing the refrigeration system's power consumption.

[0130] S270. Adjust the compressor speed to the compressor adjustment speed, adjust the throttling element opening to the throttling element adjustment opening, adjust the evaporator fan speed to the evaporator fan adjustment speed, and adjust the condenser fan speed to the condenser fan adjustment speed.

[0131] Step S270 is identical to step S140. For a detailed description of step S270, please refer to the description of step S140. It will not be repeated here.

[0132] Optionally, the compressor parameter information includes compressor suction pressure, compressor speed control reference suction pressure, compressor discharge pressure, and compressor speed control reference discharge pressure; the throttling element parameter information includes a first equity coefficient and a second equity coefficient.

[0133] Specifically, the first and second equity coefficients can be set and stored in the environmental test chamber according to actual conditions. Compressor suction pressure and compressor discharge pressure refer to parameter information during actual compressor operation. The compressor speed control reference suction pressure and compressor speed control reference discharge pressure can be set parameters. Compressor suction pressure is the actual pressure of the refrigerant at the compressor inlet, and compressor discharge pressure is the actual pressure of the refrigerant at the compressor outlet. The compressor suction pressure can be obtained through a compressor suction pressure sensor, and the compressor discharge pressure can be obtained through a compressor discharge pressure sensor. The compressor speed control reference discharge pressure can be set and stored in the environmental test chamber according to actual conditions.

[0134] The compressor speed control reference suction pressure can be obtained by looking up a table. Current temperature information includes the current actual temperature. The compressor speed control reference suction pressure can be determined based on the linear cooling rate, the current actual temperature, and a first database. The first database includes the compressor speed control reference suction pressure at different linear cooling rates and different current actual temperatures. For example, the table below shows the first database:

[0135] T1 T2 … Tj V1 LP0_11 LP0_12 … LP0_1j V2 LP0_21 LP0_22 … LP0_2j … … … … … Vi LP0_i1 LP0_i2 … LP0_ij

[0136] T1, T2…Tj represent different current actual temperatures, V1, V2…Vi represent different linear cooling rates, and LP0_11, LP0_12…LP0_1j, LP0_21, LP0_22…LP0_2j…LP0_i1, LP0_i2…LP0_ij represent different compressor speed control reference suction pressures. It can be seen that after determining the linear cooling rate and the current actual temperature, the compressor speed control reference suction pressure can be obtained from the first database by looking up a table.

[0137] Optionally, the compressor adjustment speed is determined based on the linear cooling rate, the set starting temperature, the current temperature information, and the compressor parameter information, including:

[0138] Determine the current cooling rate based on the current temperature information and the set starting temperature;

[0139] The rate deviation is determined based on the linear cooling rate and the current cooling rate.

[0140] The first operating condition deviation is determined based on the compressor suction pressure and the compressor speed control reference suction pressure.

[0141] The deviation of the second operating condition is determined based on the compressor discharge pressure and the compressor speed control reference discharge pressure.

[0142] The compressor speed control deviation is determined based on the rate deviation, the first operating condition deviation, and the second operating condition deviation.

[0143] The compressor adjustment speed is determined based on the compressor speed control deviation.

[0144] Specifically, the compressor speed control reference suction pressure can be the target value of the compressor suction pressure, and the compressor speed control reference discharge pressure can be the target value of the compressor discharge pressure. The compressor adjustment speed is determined based on the rate deviation, the first operating condition deviation, and the second operating condition deviation, which can make the compressor speed close to the compressor target speed. This allows the cooling capacity of the refrigeration system to match the cooling capacity required by the environmental test chamber, reducing the compressor's power consumption. It can also make the linear cooling curve of the environmental test chamber closer to linear, thus meeting the testing requirements of the tested products.

[0145] Optionally, the adjustment degree of the throttling element is determined based on the linear cooling rate, the set starting temperature, the current temperature information, and the throttling element parameter information, including:

[0146] The control deviation of the throttling element opening is determined based on the linear cooling rate, the set starting temperature, the current temperature information, the first equity coefficient, and the second equity coefficient.

[0147] The adjustment degree of the throttling element is determined based on the control deviation of the throttling element opening.

[0148] Specifically, based on the linear cooling rate, the set starting temperature, the current temperature information, the first equity coefficient, and the second equity coefficient, the control deviation of the throttling element opening can be determined to match the cooling capacity generated by the refrigeration system with the cooling capacity required by the environmental test chamber, making the linear cooling curve of the environmental test chamber closer to linear and meeting the testing requirements of the test products.

[0149] Optionally, the evaporator operating information includes the evaporator inlet air temperature and evaporation temperature; the compressor parameter information includes the actual compression ratio; and the current temperature information includes the current actual temperature.

[0150] Specifically, the evaporator inlet air temperature can be obtained through an evaporator inlet air temperature sensor. Evaporation temperature refers to the saturation temperature at which the refrigerant absorbs heat and evaporates within the evaporator. The evaporation temperature is determined by the evaporation pressure and follows the pressure-temperature saturation characteristics of the refrigerant; it can be obtained by looking up a table. The actual compression ratio is the ratio of the compressor discharge pressure to the compressor suction pressure.

[0151] Optionally, the evaporator fan speed can be adjusted based on current temperature and evaporator operating information, including:

[0152] The first temperature deviation is determined based on the current actual temperature and the evaporator inlet air temperature.

[0153] The second temperature deviation is determined based on the evaporation temperature and the evaporator inlet air temperature.

[0154] The evaporator fan speed control deviation is determined based on the first temperature deviation and the second temperature deviation.

[0155] The evaporator fan speed adjustment speed is determined based on the evaporator fan speed control deviation.

[0156] Specifically, the ratio of the current actual temperature to the evaporator inlet air temperature can be used as the first temperature deviation, and the ratio of the evaporation temperature to the evaporator inlet air temperature can be used as the second temperature deviation. The evaporator fan speed control deviation is determined based on the current actual temperature, evaporator inlet air temperature, and evaporation temperature. This ensures that the adjusted evaporator fan speed, determined by the evaporator fan speed control deviation, matches the cooling requirements of the environmental test chamber. This ensures that the cooling capacity generated by the refrigeration system matches the required cooling capacity of the environmental test chamber, reducing the power consumption of the refrigeration system. It also makes the linear cooling curve of the environmental test chamber closer to linear, meeting the testing requirements of the tested products and ensuring the reliability of the environmental test chamber operation.

[0157] Optionally, the condenser fan speed can be determined based on the compressor adjustment speed, linear cooling rate, and compressor parameter information, including:

[0158] The target compression ratio is determined based on the compressor suction pressure and linear cooling rate.

[0159] The condenser fan speed control deviation is determined based on the target compression ratio, the actual compression ratio, and the compressor adjustment speed.

[0160] The condenser fan speed adjustment speed is determined based on the condenser fan speed control deviation.

[0161] Specifically, the target compression ratio can be determined by the linear cooling rate, the compressor suction pressure, and a second database. The second database includes the target compression ratios under different linear cooling rates and different compressor suction pressures. For example, the table below shows the second database:

[0162] LP1 LP2 … LPj V1 PR_11 PR_12 … PR_1j V2 PR_21 PR_22 … PR_2j … … … … … Vi PR_i1 PR_i2 … PR_ij

[0163] LP1, LP2…LPj represent different compressor suction pressures, V1, V2…Vi represent different linear cooling rates, and PR_11, PR_12…PR_1j, PR_21, PR_22…PR_2j…PR_i1, PR_i2…PR_ij represent different target compression ratios. It can be seen that after determining the linear cooling rate and compressor suction pressure, the target compression ratio can be obtained from the second database by looking up a table.

[0164] The compression ratio deviation can be determined based on the difference between the target compression ratio and the actual compression ratio. Then, the condenser fan speed control deviation can be determined based on the compression ratio deviation and the compressor speed adjustment. Finally, the condenser fan speed adjustment can be determined by performing a proportional-integral-derivative operation on the condenser fan speed control deviation. This condenser fan speed control deviation, determined based on the target compression ratio, the actual compression ratio, and the compressor speed adjustment, ensures that the condenser fan speed adjustment determined by the condenser fan speed control deviation matches the cooling requirements of the environmental test chamber. This matches the cooling capacity generated by the refrigeration system with the required cooling capacity of the environmental test chamber, reducing the power consumption of the refrigeration system and making the linear cooling curve of the environmental test chamber closer to linear, meeting the testing requirements of the tested products and ensuring the reliability of the environmental test chamber operation.

[0165] Optionally, the current temperature information includes the current actual temperature and the current cooling duration.

[0166] Optionally, the compressor speed control deviation is determined based on the rate deviation, the first operating condition deviation, and the second operating condition deviation, including:

[0167] The compressor speed control deviation is determined using the following formula:

[0168]

[0169] Where e1(τ) is the compressor speed control deviation, For rate deviation, This is the first operating condition deviation. The second operating condition deviation is represented by V, which is the linear cooling rate, τ is the current cooling duration, T0 is the set starting temperature, T is the current actual temperature, LP is the compressor suction pressure, LP0 is the compressor speed control reference suction pressure, HP is the compressor discharge pressure, and HP0 is the compressor speed control reference discharge pressure.

[0170] Specifically, the current cooling time is greater than or equal to 0 and less than or equal to the set cooling time, and the current actual temperature is less than or equal to the set starting temperature and greater than or equal to the set ending temperature. This system corrects the compressor speed based on the rate deviation, the first operating condition deviation, and the second operating condition deviation. During the correction process, the compressor speed is adjusted by setting... This avoids over-correction and ensures the compressor functions properly.

[0171] Optionally, the compressor adjustment speed can be determined based on the compressor speed control deviation, including:

[0172] The compressor adjustment speed is determined using the following formula:

[0173]

[0174] Where F is the compressor adjustment speed, P1 is the first proportional coefficient, I1 is the first integral coefficient, and D1 is the first differential coefficient.

[0175] Specifically, P1, I1, and D1 can be set according to actual needs. PID (proportional-integral-derivative) control of the compressor speed can significantly improve the dynamic response, energy efficiency, and stability of the refrigeration system, and can also reduce compressor energy consumption and extend compressor lifespan.

[0176] Optionally, the throttling element opening control deviation is determined based on the linear cooling rate, the set starting temperature, the current temperature information, the first equity coefficient, and the second equity coefficient, including:

[0177] The throttling element opening control deviation is determined using the following formula:

[0178]

[0179] Where e2(τ) is the control deviation of the throttling element opening, E A E is the first equity coefficient. B This is the second equity coefficient.

[0180] Specifically, as can be seen from the above formula, when determining the control deviation of the throttling element opening, the ratio of the rate deviation, instantaneous rate deviation, and temperature deviation can be determined by using the linear cooling rate, the set starting temperature, and the current temperature information. Then, the control deviation of the throttling element opening is determined by combining the first equity coefficient and the second equity coefficient. This implementation example adjusts the opening of the throttling element in real time according to the current cooling rate and the linear cooling rate, thereby accurately regulating the cooling capacity of the refrigeration system. This ensures that the cooling capacity generated by the refrigeration system meets the requirements of the environmental testing equipment, further guarantees the reliability of the refrigeration system, and further reduces the power consumption of the refrigeration system.

[0181] Optionally, the adjustment degree of the throttling element is determined based on the control deviation of the throttling element opening, including:

[0182] The adjustment degree of the throttling element is determined according to the following formula:

[0183]

[0184] Where E is the throttling element adjustment opening, P2 is the second proportional coefficient, I2 is the second integral coefficient, and D2 is the second differential coefficient.

[0185] Specifically, P2, I2, and D2 can be set according to actual needs. PID control of the throttling element opening can significantly improve the dynamic response, energy efficiency, and stability of the refrigeration system, ensuring its reliability.

[0186] Optionally, the evaporator fan speed control deviation is determined based on the first temperature deviation and the second temperature deviation, including:

[0187] The evaporator fan speed control deviation is determined using the following formula:

[0188]

[0189] Where e3(τ) is the evaporator fan speed control deviation. The first temperature deviation, The second temperature deviation is T8, where T is the evaporator inlet air temperature. EVA T represents the evaporation temperature, and T represents the current actual temperature.

[0190] Specifically, by adjusting the evaporator fan speed control deviation in real time based on the current actual temperature, evaporator inlet air temperature, and evaporation temperature, the adjusted evaporator fan speed determined by the evaporator fan speed control deviation can more accurately meet the cooling requirements of the environmental test chamber. This also reduces the cooling rate caused by insufficient airflow from the evaporator fan and lowers the power consumption of the evaporator fan.

[0191] Optionally, the evaporator fan adjustment speed is determined based on the evaporator fan speed control deviation, including:

[0192] The evaporator fan speed adjustment should be determined using the following formula:

[0193]

[0194] Where A is the evaporator fan speed adjustment, P3 is the third proportional coefficient, I3 is the third integral coefficient, and D3 is the third differential coefficient.

[0195] Specifically, P3, I3, and D3 can be set according to actual needs. PID control of the evaporator fan speed can significantly improve the dynamic response, energy efficiency, and stability of the refrigeration system, ensuring its reliability. It can also reduce the power consumption of the evaporator fan, thereby reducing the overall power consumption of the refrigeration system.

[0196] Optionally, the condenser fan speed control deviation is determined based on the target compression ratio, the actual compression ratio, and the compressor adjustment speed, including:

[0197] The condenser fan speed control deviation is determined using the following formula:

[0198] e4(τ)=(PR-PR0)·(In(F+1)+0.5)

[0199] Where e4(τ) is the condenser fan speed control deviation, PR is the actual compression ratio, PR0 is the target compression ratio, and F is the compressor adjustment speed.

[0200] Specifically, by using the above formula to determine the condenser fan speed control deviation, the final determined condenser fan speed adjustment can meet the cooling requirements of the environmental test chamber, and also reduce the power consumption of the condenser fan.

[0201] Optionally, the condenser fan adjustment speed is determined based on the condenser fan speed control deviation, including:

[0202] The condenser fan adjustment speed is determined using the following formula:

[0203]

[0204] Where C is the condenser fan speed adjustment, P4 is the fourth proportional coefficient, I4 is the fourth integral coefficient, and D4 is the fourth differential coefficient.

[0205] Specifically, P4, I4, and D4 can be set according to actual needs. PID control of the condenser fan speed can significantly improve the dynamic response, energy efficiency, and stability of the refrigeration system, ensure the reliability of the refrigeration system, extend the service life of the condenser fan, and reduce the power consumption of the condenser fan, thereby reducing the power consumption of the refrigeration system.

[0206] Figure 4 This is a schematic diagram of the structure of a temperature control device for an environmental test chamber according to an embodiment of the present invention. (Refer to...) Figure 4 The temperature control device includes an acquisition module 210, a determination module 220, and a control module 230. The acquisition module 210 is used to acquire compressor parameter information, set temperature information and current temperature information of the environmental test chamber, throttling element parameter information, and evaporator operating information. The set temperature information includes the set start temperature, set end temperature, and set cooling time. The determination module 220 is used to determine the linear cooling rate based on the set temperature information, and also to determine the compressor adjustment speed, throttling element adjustment opening, evaporator fan adjustment speed, and condenser fan adjustment speed based on the linear cooling rate, set start temperature, current temperature information, compressor parameter information, throttling element parameter information, and evaporator operating information, respectively. The control module 230 is used to adjust the compressor speed to the compressor adjustment speed, the throttling element opening to the throttling element adjustment opening, the evaporator fan speed to the evaporator fan adjustment speed, and the condenser fan speed to the condenser fan adjustment speed.

[0207] This embodiment provides a temperature control device for an environmental test chamber. This device controls the compressor speed, throttling element opening, evaporator fan speed, and condenser fan speed based on the linear cooling rate, set starting temperature, current temperature information, compressor parameter information, throttling element parameter information, and evaporator operating information. This ensures that the cooling capacity generated by the refrigeration system matches the required cooling capacity within the environmental test chamber, resulting in a more linear cooling curve within the chamber. This guarantees the reliability of the environmental test chamber and reduces the power consumption of the compressor, evaporator fan, and condenser fan, thereby lowering the overall power consumption of the refrigeration system within the chamber. In summary, the temperature control device for the environmental test chamber provided in this embodiment can accurately control the temperature within the chamber, improve the operational reliability, and reduce the energy consumption of the refrigeration system.

[0208] Optional, Figure 5 This is a structural schematic diagram of a temperature control device for an environmental test chamber according to an embodiment of the present invention, with reference to... Figure 5 The control module 230 includes a compressor speed control submodule 231, a throttling element opening degree control submodule 232, an evaporator fan speed control submodule 233, and a condenser fan speed control submodule 234. The compressor speed control submodule 231 is used to adjust the compressor speed to the compressor adjustment speed; the throttling element opening degree control submodule 232 is used to adjust the throttling element opening degree to the throttling element adjustment degree; the evaporator fan speed control submodule 233 is used to adjust the evaporator fan speed to the evaporator fan adjustment speed; and the condenser fan speed control submodule 234 is used to adjust the condenser fan speed to the condenser fan adjustment speed.

[0209] Optionally, continue to refer to Figure 5 The compressor parameter information includes the compressor suction pressure and the compressor discharge pressure; the evaporator operating information includes the evaporator inlet air temperature; the current temperature information includes the current actual temperature; the acquisition module 210 includes a compressor suction pressure sensor 211, a compressor discharge pressure sensor 212, an evaporator inlet air temperature sensor 213, and an internal temperature sensor 214; the compressor suction pressure sensor 211 is used to acquire the compressor suction pressure; the compressor discharge pressure sensor 212 is used to acquire the compressor discharge pressure; the evaporator inlet air temperature sensor 213 is used to acquire the evaporator inlet air temperature; and the internal temperature sensor 214 is used to acquire the current actual temperature.

[0210] The temperature control device for an environmental test chamber provided in this embodiment has the same beneficial effects as the temperature control method for an environmental test chamber provided in any embodiment of the present invention. For technical details not covered in this embodiment, please refer to the temperature control method for an environmental test chamber provided in any embodiment of the present invention.

[0211] Figure 6 This is a structural schematic diagram of another environmental test chamber provided according to an embodiment of the present invention, with reference to... Figure 6 The environmental test chamber provided in this embodiment includes the temperature control device of the environmental test chamber provided in any embodiment of the present invention.

[0212] Specifically, the environmental test chamber provided in this embodiment also includes a compressor 110, a throttling element 120, an evaporator 130, an evaporator fan 140, a condenser 150, and a condenser fan 160. The temperature control device of the environmental test chamber includes a compressor suction pressure sensor 211, a compressor discharge pressure sensor 212, an evaporator inlet air temperature sensor 213, and an internal temperature sensor 214; a compressor speed control submodule 231; a throttling element opening control submodule 232; an evaporator fan speed control submodule 233; a condenser fan speed control submodule 234; and a determination module 220. The determination module 220 can communicate with the compressor suction pressure sensor 211, the compressor discharge pressure sensor 212, the evaporator inlet air temperature sensor 213, and the internal temperature sensor 160. Temperature sensor 214 is electrically connected. The determining module 220 can determine the compressor speed adjustment, throttling element opening degree, evaporator fan speed adjustment, and condenser fan speed adjustment based on the information collected by each sensor. The determined values ​​are then sent to the corresponding control submodules, which control the compressor speed 110, throttling element opening degree 120, evaporator fan speed 140, and condenser fan speed 160 respectively. This allows for precise temperature control of the environmental test chamber, improving operational reliability and reducing energy consumption of the refrigeration system.

[0213] 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.

[0214] 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 temperature control method for an environmental test chamber, characterized in that, The environmental test chamber includes a refrigeration system, which includes a compressor, a throttling element, an evaporator, an evaporator fan, a condenser, and a condenser fan. The temperature control method includes: The system acquires compressor parameter information, the set temperature information and current temperature information of the environmental test chamber, throttling element parameter information, and evaporator operating information; wherein, the set temperature information includes the set start temperature, the set end temperature, and the set cooling time; The linear cooling rate is determined based on the set temperature information; The compressor adjustment speed, throttling element adjustment opening, evaporator fan adjustment speed, and condenser fan adjustment speed are determined based on the linear cooling rate, the set starting temperature, the current temperature information, the compressor parameter information, the throttling element parameter information, and the evaporator operating information, respectively. The compressor speed is adjusted to the compressor adjustment speed, the throttling element opening is adjusted to the throttling element adjustment opening, the evaporator fan speed is adjusted to the evaporator fan adjustment speed, and the condenser fan speed is adjusted to the condenser fan adjustment speed. The step of determining the compressor adjustment speed, throttling element adjustment opening, evaporator fan adjustment speed, and condenser fan adjustment speed based on the linear cooling rate, the set starting temperature, the current temperature information, the compressor parameter information, the throttling element parameter information, and the evaporator operating information, respectively, includes: The compressor adjustment speed is determined based on the linear cooling rate, the set starting temperature, the current temperature information, and the compressor parameter information. The adjustment degree of the throttling element is determined based on the linear cooling rate, the set starting temperature, the current temperature information, and the throttling element parameter information. The evaporator fan speed is adjusted based on the current temperature information and the evaporator operating information. The condenser fan speed is determined based on the compressor adjustment speed, the linear cooling rate, and the compressor parameter information. The compressor parameter information includes: compressor suction pressure, compressor speed control reference suction pressure, compressor discharge pressure, and compressor speed control reference discharge pressure; the throttling element parameter information includes a first equity coefficient and a second equity coefficient. The step of determining the compressor adjustment speed based on the linear cooling rate, the set starting temperature, the current temperature information, and the compressor parameter information includes: The current cooling rate is determined based on the current temperature information and the set starting temperature. The rate deviation is determined based on the linear cooling rate and the current cooling rate; The first operating condition deviation is determined based on the compressor suction pressure and the compressor speed control reference suction pressure. The second operating condition deviation is determined based on the compressor discharge pressure and the compressor speed control reference discharge pressure. The compressor speed control deviation is determined based on the rate deviation, the first operating condition deviation, and the second operating condition deviation. The compressor adjustment speed is determined based on the compressor speed control deviation; The step of determining the adjustment degree of the throttling element based on the linear cooling rate, the set starting temperature, the current temperature information, and the throttling element parameter information includes: The throttling element opening control deviation is determined based on the linear cooling rate, the set starting temperature, the current temperature information, the first equity coefficient, and the second equity coefficient. The adjustment degree of the throttling element is determined based on the control deviation of the throttling element opening.

2. The temperature control method according to claim 1, characterized in that, The evaporator operating information includes the evaporator inlet air temperature and evaporation temperature; the compressor parameter information includes the actual compression ratio and compressor suction pressure; the current temperature information includes the current actual temperature. The step of determining the evaporator fan speed adjustment based on the current temperature information and the evaporator operating information includes: The first temperature deviation is determined based on the current actual temperature and the evaporator inlet air temperature. The second temperature deviation is determined based on the evaporation temperature and the evaporator inlet air temperature. The evaporator fan speed control deviation is determined based on the first temperature deviation and the second temperature deviation; The evaporator fan adjustment speed is determined based on the evaporator fan speed control deviation. Determining the condenser fan speed adjustment based on the compressor adjustment speed, the linear cooling rate, and the compressor parameter information includes: The target compression ratio is determined based on the compressor suction pressure and the linear cooling rate. The condenser fan speed control deviation is determined based on the target compression ratio, the actual compression ratio, and the compressor adjustment speed. The condenser fan speed adjustment speed is determined based on the condenser fan speed control deviation.

3. The temperature control method according to claim 1, characterized in that, The current temperature information includes the current actual temperature and the current cooling duration; The step of determining the compressor speed control deviation based on the rate deviation, the first operating condition deviation, and the second operating condition deviation includes: The compressor speed control deviation is determined according to the following formula: in, The compressor speed control deviation, The rate deviation is... This is the deviation from the first operating condition. The deviation of the second operating condition is V, and the linear cooling rate is V. Where T is the current cooling duration, T0 is the set starting temperature, T is the current actual temperature, LP is the compressor suction pressure, LP0 is the compressor speed control reference suction pressure, HP is the compressor discharge pressure, and HP0 is the compressor speed control reference discharge pressure. The step of determining the compressor adjustment speed based on the compressor speed control deviation includes: The compressor adjustment speed is determined according to the following formula: Wherein, F is the compressor adjustment speed, P1 is the first proportional coefficient, I1 is the first integral coefficient, and D1 is the first derivative coefficient; The step of determining the throttling element opening control deviation based on the linear cooling rate, the set starting temperature, the current temperature information, the first equity coefficient, and the second equity coefficient includes: The throttling element opening control deviation is determined according to the following formula: in, E represents the control deviation of the throttling element opening. A E is the first equity coefficient. B This is the second equity coefficient; The step of determining the adjustment opening of the throttling element based on the control deviation of the throttling element opening includes: The adjustment degree of the throttling element is determined according to the following formula: Where E is the adjustment degree of the throttling element, P2 is the second proportional coefficient, I2 is the second integral coefficient, and D2 is the second differential coefficient.

4. The temperature control method according to claim 2, characterized in that, The step of determining the evaporator fan speed control deviation based on the first temperature deviation and the second temperature deviation includes: The evaporator fan speed control deviation is determined according to the following formula: in, The deviation in the evaporator fan speed control. This is the first temperature deviation. The second temperature deviation is T8, where T is the evaporator inlet air temperature. EVA Where T is the evaporation temperature, and T is the current actual temperature; The step of determining the evaporator fan adjustment speed based on the evaporator fan speed control deviation includes: The evaporator fan adjustment speed is determined according to the following formula: Where A is the evaporator fan adjustment speed, P3 is the third proportional coefficient, I3 is the third integral coefficient, and D3 is the third differential coefficient; The step of determining the condenser fan speed control deviation based on the target compression ratio, the actual compression ratio, and the compressor adjustment speed includes: The condenser fan speed control deviation is determined according to the following formula: in, The condenser fan speed control deviation is PR, the actual compression ratio is PR0, the target compression ratio is F, and the compressor adjustment speed is F. The step of determining the condenser fan adjustment speed based on the condenser fan speed control deviation includes: The adjustment speed of the condenser fan is determined according to the following formula: Wherein, C is the condenser fan adjustment speed, P4 is the fourth proportional coefficient, I4 is the fourth integral coefficient, and D4 is the fourth differential coefficient.

5. A temperature control device for an environmental test chamber, characterized in that, The environmental test chamber includes a refrigeration system, which includes a compressor, a throttling element, an evaporator, an evaporator fan, a condenser, and a condenser fan. The temperature control device includes an acquisition module, a determination module, and a control module; The acquisition module is used to acquire compressor parameter information, the set temperature information and current temperature information of the environmental test chamber, the throttling element parameter information, and the evaporator operation information; wherein, the set temperature information includes the set start temperature, the set end temperature, and the set cooling time; The determining module is used to determine the linear cooling rate based on the set temperature information, and is also used to determine the compressor adjustment speed, the throttling element adjustment opening, the evaporator fan adjustment speed, and the condenser fan adjustment speed based on the linear cooling rate, the set starting temperature, the current temperature information, the compressor parameter information, the throttling element parameter information, and the evaporator operating information, respectively. The control module is used to adjust the speed of the compressor to the adjusted speed of the compressor, the opening degree of the throttling element to the adjusted opening degree of the throttling element, the speed of the evaporator fan to the adjusted speed of the evaporator fan, and the speed of the condenser fan to the adjusted speed of the condenser fan. The determining module is further configured to: The compressor adjustment speed is determined based on the linear cooling rate, the set starting temperature, the current temperature information, and the compressor parameter information. The adjustment degree of the throttling element is determined based on the linear cooling rate, the set starting temperature, the current temperature information, and the throttling element parameter information. The evaporator fan speed is adjusted based on the current temperature information and the evaporator operating information. The condenser fan speed is determined based on the compressor adjustment speed, the linear cooling rate, and the compressor parameter information. The compressor parameter information includes: compressor suction pressure, compressor speed control reference suction pressure, compressor discharge pressure, and compressor speed control reference discharge pressure; the throttling element parameter information includes a first equity coefficient and a second equity coefficient. The determining module is also used for: The current cooling rate is determined based on the current temperature information and the set starting temperature. The rate deviation is determined based on the linear cooling rate and the current cooling rate; The first operating condition deviation is determined based on the compressor suction pressure and the compressor speed control reference suction pressure. The second operating condition deviation is determined based on the compressor discharge pressure and the compressor speed control reference discharge pressure. The compressor speed control deviation is determined based on the rate deviation, the first operating condition deviation, and the second operating condition deviation. The compressor adjustment speed is determined based on the compressor speed control deviation; The determining module is also used for: The throttling element opening control deviation is determined based on the linear cooling rate, the set starting temperature, the current temperature information, the first equity coefficient, and the second equity coefficient. The adjustment degree of the throttling element is determined based on the control deviation of the throttling element opening.

6. The temperature control device according to claim 5, characterized in that, The control module includes a compressor speed control submodule, a throttling element opening degree control submodule, an evaporator fan speed control submodule, and a condenser fan speed control submodule; The compressor speed control submodule is used to adjust the compressor speed to the compressor adjustment speed; The throttling element opening control submodule is used to adjust the opening of the throttling element to the adjusted opening of the throttling element; The evaporator fan speed control submodule is used to adjust the speed of the evaporator fan to the evaporator fan adjustment speed; The condenser fan speed control submodule is used to adjust the speed of the condenser fan to the condenser fan adjustment speed.

7. The temperature control device according to claim 5, characterized in that, The compressor parameter information includes the compressor suction pressure and the compressor discharge pressure; the evaporator operating information includes the evaporator inlet air temperature; the current temperature information includes the current actual temperature. The acquisition module includes a compressor suction pressure sensor, a compressor discharge pressure sensor, an evaporator inlet air temperature sensor, and an internal temperature sensor. The compressor suction pressure sensor is used to acquire the compressor suction pressure; The compressor discharge pressure sensor is used to obtain the compressor discharge pressure; The evaporator inlet air temperature sensor is used to obtain the evaporator inlet air temperature; The internal temperature sensor is used to obtain the current actual temperature.

8. An environmental test chamber, characterized in that, Includes the temperature control device for the environmental test chamber as described in any one of claims 5-7.

Images