Environmental test chamber linear temperature reduction control device and method

Abstract

The embodiment of the present invention discloses a linear temperature reduction control device and method for an environmental test chamber. The device includes a control module, a main regulation module, a liquid bypass regulation module, a gas bypass regulation module, a condenser, a data collector and a compressor; the first end of the compressor, the first end of the main regulation module, the first end of the liquid bypass regulation module and the first end of the gas bypass regulation module are connected, the second end of the main regulation module, the second end of the liquid bypass regulation module and the first end of the condenser are connected, the second end of the condenser, the second end of the gas bypass regulation module and the second end of the compressor are connected; the main regulation module, the liquid bypass regulation module and the gas bypass regulation module are all connected to the control module, and the data collector is arranged at the first end of the compressor; in this case, the output of the main regulation module, the output of the liquid bypass regulation module and the output of the gas bypass regulation module are linearly controlled by the control module to offset the excess refrigeration capacity, thereby reducing energy consumption.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of environmental testing equipment, and in particular to a linear temperature reduction control device and method for an environmental testing chamber. Background Art

[0002] With the advancement of life and technology, the requirements for product reliability are getting higher and higher. In many fields, it is necessary to test the reliability, material stress changes, and changes in material properties of products or components when they are cooled from high temperature to low temperature within a certain period of time.

[0003] At present, most linear cooling uses fixed-frequency compressors. In the early and middle stages of cooling, the cooling demand is much smaller than the compressor capacity. In order to ensure the oil return reliability of the system, the refrigerant flow rate in the system pipeline needs to be kept within a certain range, and the fixed-frequency compressor itself cannot adjust the compressor cooling capacity. Therefore, it is necessary to use heating offset, which will cause a lot of power waste. Summary of the invention

[0004] The embodiment of the present invention provides a linear temperature reduction control device and method for an environmental test chamber, so as to improve the reliability of the operation of the linear temperature reduction control device for the environmental test chamber and reduce the energy consumption of the linear temperature reduction control device for the environmental test chamber.

[0005] In a first aspect, an embodiment of the present invention provides a linear temperature reduction control device for an environmental test chamber, the linear temperature reduction control device for an environmental test chamber comprising a control module, a main circuit adjustment module, a liquid bypass adjustment module, a gas bypass adjustment module, a condenser, a data collector, and a compressor;

[0006] The first end of the compressor, the first end of the main regulating module, the first end of the liquid bypass regulating module and the first end of the gas bypass regulating module are in communication, the second end of the main regulating module, the second end of the liquid bypass regulating module and the first end of the condenser are in communication, and the second end of the condenser, the second end of the gas bypass regulating module and the second end of the compressor are in communication;

[0007] The main circuit regulating module, the liquid bypass regulating module and the gas bypass regulating module are all connected to the control module, and the data collector is arranged at the first end of the compressor;

[0008] The control module is used to control the output of the main regulation module, the output of the liquid bypass regulation module and the output of the gas bypass regulation module to control the linear temperature reduction of the environmental test box.

[0009] Optionally, the main circuit regulating module includes an evaporator, an evaporator fan, a main circuit throttle valve and a main circuit pulse solenoid valve;

[0010] The first end of the evaporator serves as the first end of the main regulating module, the second end of the evaporator is connected to the first end of the main throttle valve, the second end of the main throttle valve is connected to the first end of the main pulse solenoid valve, and the second end of the main pulse solenoid valve serves as the second end of the main regulating module;

[0011] The evaporator fan is arranged above the evaporator.

[0012] Optionally, the liquid bypass regulating module includes a liquid bypass throttle valve and a liquid bypass pulse solenoid valve;

[0013] The first end of the liquid bypass throttle valve serves as the first end of the liquid bypass regulating module, the second end of the liquid bypass throttle valve is connected to the first end of the liquid bypass pulse solenoid valve, and the second end of the liquid bypass pulse solenoid valve serves as the second end of the liquid bypass regulating module.

[0014] Optionally, the gas bypass regulating module includes a gas bypass throttle valve and a gas bypass pulse solenoid valve;

[0015] The first end of the gas bypass throttle valve serves as the first end of the gas bypass regulating module, the second end of the gas bypass throttle valve is connected to the first end of the gas bypass pulse solenoid valve, and the second end of the gas bypass pulse solenoid valve serves as the second end of the gas bypass regulating module.

[0016] Optionally, the data collector includes an intake pressure sensor and an intake temperature sensor;

[0017] The suction pressure sensor and the suction temperature sensor are arranged at the first end of the compressor; the suction pressure sensor is used to detect the suction pressure of the compressor, and the suction temperature sensor is used to detect the suction temperature of the compressor.

[0018] In a second aspect, an embodiment of the present invention further provides a method for controlling a linear temperature drop in an environmental test chamber, which is performed by using a linear temperature drop control device for an environmental test chamber provided by any embodiment of the present invention, wherein the first end of the evaporator serves as the first end of the main regulating module, the second end of the evaporator is connected to the first end of the main throttle valve, the second end of the main throttle valve is connected to the first end of the main pulse solenoid valve, and the second end of the main pulse solenoid valve serves as the second end of the main regulating module; the evaporator fan is arranged above the evaporator;

[0019] The liquid bypass regulating module includes a liquid bypass throttle valve and a liquid bypass pulse solenoid valve;

[0020] The first end of the liquid bypass throttle valve serves as the first end of the liquid bypass regulating module, the second end of the liquid bypass throttle valve is connected to the first end of the liquid bypass pulse solenoid valve, and the second end of the liquid bypass pulse solenoid valve serves as the second end of the liquid bypass regulating module;

[0021] The gas bypass regulating module includes a gas bypass throttle valve and a gas bypass pulse solenoid valve;

[0022] The first end of the gas bypass throttle valve serves as the first end of the gas bypass regulating module, the second end of the gas bypass throttle valve is connected to the first end of the gas bypass pulse solenoid valve, and the second end of the gas bypass pulse solenoid valve serves as the second end of the gas bypass regulating module;

[0023] The linear temperature reduction control method of the environmental test chamber includes:

[0024] Divide the suction pressure range, cooling time and total cooling temperature range into n equal parts, where n is determined by the accuracy, n≥1;

[0025] According to the deviation between the real-time temperature and the target temperature of the corresponding section, the target output of the main pulse solenoid valve in each cooling temperature section is determined;

[0026] Determine the first output of the gas bypass pulse solenoid valve in each cooling temperature section according to the deviation between the suction pressure of the corresponding section and the calibrated main line suction pressure;

[0027] According to the deviation between the actual suction superheat and the suction superheat target value, the target output of the liquid bypass pulse solenoid valve in each cooling temperature section is determined;

[0028] Determining a correction coefficient of the gas bypass pulse solenoid valve according to a target output of the liquid bypass pulse solenoid valve and a first output of the gas bypass pulse solenoid valve;

[0029] Determining a target output of the gas bypass pulse solenoid valve according to the correction coefficient and a first output of the gas bypass pulse solenoid valve;

[0030] Adjust the output of the main pulse solenoid valve according to the target output of the main pulse solenoid valve, adjust the output of the liquid bypass pulse solenoid valve according to the target output of the liquid bypass pulse solenoid valve, and adjust the output of the gas bypass pulse solenoid valve according to the target output of the gas bypass pulse solenoid valve.

[0031] Optionally, the target output of the main pulse solenoid valve is:

[0032]

[0033] Among them, Z1, Z2, ..., Z nis the target output of the main pulse solenoid valve in each cooling temperature section, K1, K2, ..., K n are proportionality coefficients, I1, I2, ..., I n is the integral coefficient, D1, D2, ..., D n are differential coefficients, e1, e2, ..., e n is the temperature deviation determined by the deviation between the real-time temperature and the target temperature of the corresponding segment, τ is the time, Δt1, Δt2,..., Δt n-1 for Cooling time corresponding to each cooling temperature section , T0 is the starting temperature, ΔT1, ΔT2, ..., ΔT n The total temperature range of the cooling is divided into n equal parts, T sv is the target temperature.

[0034] Optionally, the first output of the gas bypass pulse solenoid valve is:

[0035] ...

[0036]

[0037] g1(τ)=P min +ΔP1-P z1

[0038] g2(τ)=P min +ΔP1+ΔP2-P z1 ...

[0039] g n (τ) = P max -P zn ,

[0040] Among them, U1, U2, ..., U n is the first output of the gas bypass pulse solenoid valve in each cooling temperature section, K1′, K2′, ..., K n ′ is the proportionality coefficient, I1′, I2′, ..., I n ' is the integral coefficient, D1', D2', ..., D n ′ is the differential coefficient, g1, g2, ..., g n is the pressure deviation, τ is the time, Δt1, Δt2, ..., Δt n-1 The cooling time corresponding to each cooling temperature section , T0 is the starting temperature, ΔT1, ΔT2, ..., ΔT n The total temperature range of the cooling is divided into n equal parts, T sv is the target temperature, P min is the minimum suction pressure, P max is the maximum suction pressure, ΔP1, ΔP2, ..., ΔP nis the suction pressure range divided into n equal parts of suction pressure, P z1 , P z2 , ..., P zn When only the main output is calibrated, the main suction pressure corresponding to different main outputs.

[0041] Optionally, the target output of the liquid bypass pulse solenoid valve is:

[0042]

[0043] Among them, Q1, Q2, ..., Q n is the target output of the liquid bypass pulse solenoid valve in each cooling temperature section, K1", K2", ..., K n " is the proportionality coefficient, I1", I2", ..., I n " is the integral coefficient, D1", D2", ..., D n 〞 is the differential coefficient, q1, q2, ..., q n is the suction superheat deviation determined by the deviation between the actual suction superheat and the suction superheat target value, τ is time, Δt1, Δt2, ..., Δt n-1 The cooling time corresponding to each cooling temperature section , T0 is the starting temperature, ΔT1, ΔT2, ..., ΔT n The total temperature range of the cooling is divided into n equal parts, T sv is the target temperature.

[0044] Optionally, the correction coefficient of the gas bypass pulse solenoid valve is:

[0045]

[0046] Among them, m1, m2, ..., m n is the correction coefficient of the gas bypass pulse solenoid valve in each cooling temperature section, Q1, Q2, ..., Q n is the target output of the liquid bypass pulse solenoid valve in each cooling temperature section, U1, U2, ..., U n It is the first output of the gas bypass pulse solenoid valve in each cooling temperature section.

[0047] Optionally, the target output of the gas bypass pulse solenoid valve is:

[0048]

[0049] Among them, G1, G2, …, G n It is the target output of the gas bypass pulse solenoid valve in each cooling temperature section.

[0050] The environmental test chamber linear cooling control device provided by the embodiment of the present invention is composed of a control module, a main circuit regulating module, a liquid bypass regulating module, a gas bypass regulating module, a condenser, a data acquisition device and a compressor. The output of the main circuit regulating module, the output of the liquid bypass regulating module and the output of the gas bypass regulating module are linearly controlled by the control module to adjust the pressure and flow of each pipeline of the entire cooling device so that the refrigerant flow rate in each pipeline is maintained within a certain range, thereby controlling the linear cooling of the environmental test chamber and improving the system operation reliability; the output of the main circuit regulating module, the output of the liquid bypass regulating module and the output of the gas bypass regulating module are linearly controlled by the control module, and the excess cooling capacity can also be unloaded through the gas bypass and the liquid bypass to unload the compressor capacity. Therefore, compared with the prior art, the energy consumption is reduced by offsetting the excess cooling capacity by heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0052] Figure 1 A schematic diagram of the structure of a linear temperature reduction control device for an environmental test chamber provided by an embodiment of the present invention;

[0053] Figure 2 A schematic diagram of the structure of another linear temperature reduction control device for an environmental test chamber provided by an embodiment of the present invention;

[0054] Figure 3 A schematic flow chart of a linear temperature reduction control method for an environmental test chamber provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0055] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0056] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0057] Figure 1 A schematic diagram of a linear temperature reduction control device for an environmental test chamber provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the linear temperature reduction control device of the environmental test chamber includes a control module 110, a main circuit adjustment module 120, a liquid bypass adjustment module 130, a gas bypass adjustment module 140, a condenser 150, a data collector 160 and a compressor 170;

[0058] The first end of the compressor 170, the first end of the main regulation module 120, the first end of the liquid bypass regulation module 130 and the first end of the gas bypass regulation module 140 are connected, the second end of the main regulation module 120, the second end of the liquid bypass regulation module 130 and the first end of the condenser 150 are connected, the second end of the condenser 150, the second end of the gas bypass regulation module 140 and the second end of the compressor 170 are connected; the main regulation module 120, the liquid bypass regulation module 130 and the gas bypass regulation module 140 are all connected to the control module 110, and the data acquisition device 160 is arranged at the first end of the compressor 170; the control module 110 is used to control the output of the main regulation module 120, the output of the liquid bypass regulation module 130 and the output of the gas bypass regulation module 140 to control the linear cooling of the environmental test chamber.

[0059] Among them, the circulation path of the main line refrigerant is: compressor 170-main line regulation module 120-condenser 150-compressor 170; the circulation path of the liquid bypass refrigerant is: compressor 170-condenser 150-liquid bypass regulation module 130-compressor 170; the circulation path of the gas bypass gas is: compressor 170-gas bypass regulation module 140-compressor 170.

[0060] Specifically, the main circuit regulating module 120 can control the pressure and flow rate of the refrigerant flowing in the main circuit, the liquid bypass regulating module 130 can control the pressure and flow rate of the refrigerant flowing in the liquid bypass, and the gas bypass regulating module 140 can control the pressure and flow rate of the gas in the gas bypass. Thus, the control module 110 can adjust the pressure and flow rate of each pipeline of the entire cooling device by controlling the main circuit regulating module 120, the liquid bypass regulating module 130 and the gas bypass regulating module 140, so that the refrigerant flow rate in each pipeline is maintained within a certain range, so that the environmental test box can be controlled to cool linearly, thereby improving the reliability of system operation.

[0061] In addition, the control module 110 of the present solution can unload the compressor 170 capacity through the gas bypass and the liquid bypass by linearly controlling the output of the main circuit regulating module 120, the output of the liquid bypass regulating module 130, and the output of the gas bypass regulating module 140. Thus, compared with the prior art that offsets the excess cooling capacity by heating, energy consumption is reduced.

[0062] The linear temperature reduction control device for an environmental test chamber provided by an embodiment of the present invention is composed of a control module 110, a main circuit regulating module 120, a liquid bypass regulating module 130, a gas bypass regulating module 140, a condenser 150, a data collector 160, and a compressor 170. The output of the main circuit regulating module 120, the output of the liquid bypass regulating module 130, and the output of the gas bypass regulating module 140 are linearly controlled by the control module 110 to adjust the pressure and flow of each pipeline of the entire cooling device, so that the refrigerant flow rate in each pipeline is kept within a certain range, so that the environmental test chamber can be controlled to cool linearly, and the system operation reliability is improved; the output of the main circuit regulating module 120, the output of the liquid bypass regulating module 130, and the output of the gas bypass regulating module 140 are linearly controlled by the control module 110, and the excess refrigeration capacity can also be unloaded through the gas bypass and the liquid bypass. Therefore, compared with the prior art, the energy consumption is reduced by offsetting the excess refrigeration capacity by heating.

[0063] Figure 2 A schematic diagram of the structure of another linear temperature reduction control device for an environmental test chamber provided by an embodiment of the present invention is shown in FIG. Figure 2 As shown, the main circuit regulating module 120 includes an evaporator 121, an evaporator fan 122, a main circuit throttle valve 123 and a main circuit pulse solenoid valve 124;

[0064] The first end of the evaporator 121 serves as the first end of the main regulating module 120, the second end of the evaporator 121 is connected to the first end of the main throttle valve 123, the second end of the main throttle valve 123 is connected to the first end of the main pulse solenoid valve 124, and the second end of the main pulse solenoid valve 124 serves as the second end of the main regulating module 120; the evaporator fan 122 is arranged above the evaporator 121.

[0065] The liquid bypass regulating module 130 includes a liquid bypass throttle valve 131 and a liquid bypass pulse solenoid valve 132;

[0066] The first end of the liquid bypass throttle valve 131 serves as the first end of the liquid bypass regulating module 130 , the second end of the liquid bypass throttle valve 131 is connected to the first end of the liquid bypass pulse solenoid valve 132 , and the second end of the liquid bypass pulse solenoid valve 132 serves as the second end of the liquid bypass regulating module 130 .

[0067] The gas bypass regulating module 140 includes a gas bypass throttle valve 141 and a gas bypass pulse solenoid valve 142;

[0068] The first end of the gas bypass throttle valve 141 serves as the first end of the gas bypass regulating module 140 , the second end of the gas bypass throttle valve 141 is connected to the first end of the gas bypass pulse solenoid valve 142 , and the second end of the gas bypass pulse solenoid valve 142 serves as the second end of the gas bypass regulating module 140 .

[0069] The data collector 160 includes an intake pressure sensor 161 and an intake temperature sensor 162;

[0070] The suction pressure sensor 161 and the suction temperature sensor 162 are disposed at a first end of the compressor 170 ; the suction pressure sensor 161 is used to detect the suction pressure of the compressor 170 , and the suction temperature sensor 162 is used to detect the suction temperature of the compressor 170 .

[0071] The control module 110 includes a liquid bypass pulse solenoid valve opening control unit 111 , a gas bypass pulse solenoid valve opening control unit 112 , a main pulse solenoid valve opening control unit 113 and a collection and calculation control unit 114 .

[0072] Among them, the liquid bypass pulse solenoid valve opening control unit 111 is connected to the liquid bypass pulse solenoid valve 132, and the liquid bypass pulse solenoid valve opening control unit 111 can control the opening of the liquid bypass pulse solenoid valve 132, thereby controlling the flow of the liquid bypass. The gas bypass pulse solenoid valve opening control unit 112 is connected to the gas bypass pulse solenoid valve 142, and the gas bypass pulse solenoid valve opening control unit 112 can control the opening of the gas bypass pulse solenoid valve 142, thereby controlling the flow of the gas bypass. The main pulse solenoid valve opening control unit 113 is connected to the main pulse solenoid valve 124, and the main pulse solenoid valve opening control unit 113 can control the opening of the main pulse solenoid valve 124, thereby controlling the flow of the main road.

[0073] The linear temperature reduction control device for the environmental test chamber further includes an in-chamber temperature sensor 180 , which is connected to the acquisition and calculation control unit 114 . The in-chamber temperature sensor 180 can detect the temperature in the chamber and transmit it to the acquisition and calculation control unit 114 .

[0074] Figure 3 A flow chart of a linear temperature reduction control method for an environmental test chamber provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, the steps of the linear temperature reduction control method of the environmental test chamber include:

[0075] S210, dividing the suction pressure range, the cooling time and the total cooling temperature range into n equal parts, where n is determined by the accuracy, and n≥1.

[0076] S220. Determine the target output of the main pulse solenoid valve in each cooling temperature section according to the deviation between the real-time temperature of the corresponding section and the target temperature.

[0077] S230. Determine the first output of the gas bypass pulse solenoid valve in each cooling temperature section according to the deviation between the suction pressure of the corresponding section and the calibrated main line suction pressure.

[0078] S240. Determine the target output of the liquid bypass pulse solenoid valve in each cooling temperature section according to the deviation between the actual suction superheat and the suction superheat target value.

[0079] S250: Determine a correction coefficient of the gas bypass pulse solenoid valve according to the target output of the liquid bypass pulse solenoid valve and the first output of the gas bypass pulse solenoid valve.

[0080] Among them, when the liquid bypass pulse solenoid valve has output, the suction pressure of the linear temperature reduction control device of the environmental test chamber will increase, so it is necessary to correct the PID calculated output of the gas bypass pulse solenoid valve.

[0081] S260: Determine a target output of the gas bypass pulse solenoid valve according to the correction coefficient and the first output of the gas bypass pulse solenoid valve.

[0082] S270. Adjust the output of the main pulse solenoid valve according to the target output of the main pulse solenoid valve, adjust the output of the liquid bypass pulse solenoid valve according to the target output of the liquid bypass pulse solenoid valve, and adjust the output of the gas bypass pulse solenoid valve according to the target output of the gas bypass pulse solenoid valve.

[0083] The embodiment of the present invention determines the target output of the main pulse solenoid valve in each cooling temperature section according to the deviation between the real-time temperature of the corresponding section and the target temperature. The first output of the gas bypass pulse solenoid valve in each cooling temperature section is determined according to the deviation between the suction pressure of the corresponding section and the calibrated main suction pressure. The target output of the liquid bypass pulse solenoid valve in each cooling temperature section is determined according to the deviation between the actual suction superheat and the suction superheat target value. The correction coefficient of the gas bypass pulse solenoid valve is determined according to the target output of the liquid bypass pulse solenoid valve and the first output of the gas bypass pulse solenoid valve. The target output of the gas bypass pulse solenoid valve is determined according to the correction coefficient and the first output of the gas bypass pulse solenoid valve. The output of the main pulse solenoid valve is adjusted according to the target output of the main pulse solenoid valve, the output of the liquid bypass pulse solenoid valve is adjusted according to the target output of the liquid bypass pulse solenoid valve, and the output of the gas bypass pulse solenoid valve is adjusted according to the target output of the gas bypass pulse solenoid valve. Therefore, the control module realizes the reliability of the linear cooling process system through accurate calculation of the refrigerant main flow, gas bypass flow and liquid bypass flow, as well as coupled calculation of the refrigerant main flow, gas bypass flow and liquid bypass flow, reduces the risk of compressor lack of lubricating oil, and reduces the energy consumption of the system.

[0084] Optionally, the target output of the main pulse solenoid valve is:

[0085]

[0086] Among them, Z1, Z2, ..., Z n is the target output of the main pulse solenoid valve in each cooling temperature section, K1, K2, ..., K n are differential coefficients, I1, I2, ..., I n is the integral coefficient, D1, D2, ..., D n are proportional coefficients, e1, e2, ..., e n is the temperature deviation determined by the deviation between the corresponding segment real-time temperature and the target temperature, τ is the time, Δt1, Δt2, ..., Δt n-1 Cooling for each Cooling time corresponding to the temperature range , T0 is the starting temperature, ΔT1, ΔT2, ..., ΔT n The total temperature range of the cooling is divided into n equal parts, T sv is the target temperature.

[0087] Optionally, the first output of the gas bypass pulse solenoid valve is:

[0088] ...

[0089]

[0090] g1(τ)=P min +ΔP1-P z1

[0091] g2(τ)=P min +ΔP1+ΔP2-P z1 ...

[0092] g n (τ) = P max -P zn

[0093] Among them, U1, U2, ..., U n is the first output of the gas bypass pulse solenoid valve in each cooling temperature section, K1′, K2′, ..., K n ′ is the proportionality coefficient, I1′, I2′, ..., I n ' is the integral coefficient, D1', D2', ..., D n ′ is the differential coefficient, g1, g2, ..., g n is the pressure deviation, τ is the time, Δt1, Δt2, ..., Δt n-1 The cooling time corresponding to each cooling temperature section , T0 is the starting temperature, ΔT1, ΔT2, ..., ΔT n The total temperature range of the cooling is divided into n equal parts, T sv is the target temperature, P min is the minimum suction pressure, P max is the maximum suction pressure, ΔP1, ΔP2, ..., ΔP n is the suction pressure range divided into n equal parts of suction pressure, P z1 , P z2 , ..., P zn When only the main output is calibrated, the main suction pressure corresponding to different main outputs.

[0094] Optionally, the target output of the liquid bypass pulse solenoid valve is:

[0095]

[0096] Among them, Q1, Q2, ..., Q n is the target output of the liquid bypass pulse solenoid valve in each cooling temperature section, K1", K2", ..., K n" is the proportionality coefficient, I1", I2", ..., I n " is the integral coefficient, D1", D2", ..., D n 〞 is the differential coefficient, q1, q2, ..., q n is the suction superheat deviation determined by the deviation between the actual suction superheat and the suction superheat target value, τ is the time, Δt1, Δt2, ..., Δt n-1 The cooling time corresponding to each cooling temperature section , T0 is the starting temperature, ΔT1, ΔT2, ..., ΔT n The total temperature range of the cooling is divided into n equal parts, T sv is the target temperature.

[0097] Optionally, the correction factor of the gas bypass pulse solenoid valve is:

[0098]

[0099] Among them, m1, m2, ..., m n is the correction coefficient of the gas bypass pulse solenoid valve in each cooling temperature section, Q1, Q2, ..., Q n is the target output of the liquid bypass pulse solenoid valve in each cooling temperature section, U1, U2, ..., U n It is the first output of the gas bypass pulse solenoid valve in each cooling temperature section.

[0100] Optionally, the target output of the gas bypass pulse solenoid valve is:

[0101]

[0102] Among them, G1, G2, …, G n It is the target output of the gas bypass pulse solenoid valve in each cooling temperature section.

[0103] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0104] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling a linear temperature drop in an environmental test chamber, which is performed by using a linear temperature drop control device for an environmental test chamber, wherein the linear temperature drop control device for an environmental test chamber comprises a control module, a main regulation module, a liquid bypass regulation module, a gas bypass regulation module, a condenser, a data collector and a compressor; the first end of the compressor, the first end of the main regulation module, the first end of the liquid bypass regulation module and the first end of the gas bypass regulation module are connected, the second end of the main regulation module, the second end of the liquid bypass regulation module and the first end of the condenser are connected, the second end of the condenser, the second end of the gas bypass regulation module and the second end of the compressor are connected; the main regulation module, the liquid bypass regulation module and the gas bypass regulation module are all connected to the control module, and the data collector is arranged at the first end of the compressor; The control module is used to control the output of the main regulation module, the output of the liquid bypass regulation module and the output of the gas bypass regulation module to control the linear cooling of the environmental test box; the control module is also used to unload excess refrigeration capacity through the gas bypass and the liquid bypass, characterized in that: The main circuit regulating module includes an evaporator, an evaporator fan, a main circuit throttle valve and a main circuit pulse solenoid valve; The first end of the evaporator serves as the first end of the main regulating module, the second end of the evaporator is connected to the first end of the main throttle valve, the second end of the main throttle valve is connected to the first end of the main pulse solenoid valve, and the second end of the main pulse solenoid valve serves as the second end of the main regulating module; The evaporator fan is arranged above the evaporator; The liquid bypass regulating module includes a liquid bypass throttle valve and a liquid bypass pulse solenoid valve; The first end of the liquid bypass throttle valve serves as the first end of the liquid bypass regulating module, the second end of the liquid bypass throttle valve is connected to the first end of the liquid bypass pulse solenoid valve, and the second end of the liquid bypass pulse solenoid valve serves as the second end of the liquid bypass regulating module; The gas bypass regulating module includes a gas bypass throttle valve and a gas bypass pulse solenoid valve; The first end of the gas bypass throttle valve serves as the first end of the gas bypass regulating module, the second end of the gas bypass throttle valve is connected to the first end of the gas bypass pulse solenoid valve, and the second end of the gas bypass pulse solenoid valve serves as the second end of the gas bypass regulating module; Environmental test chamber linear temperature reduction control methods include: Divide the suction pressure range, cooling time and total cooling temperature range into n equal parts, where n is determined by the accuracy, n≥1; According to the deviation between the real-time temperature and the target temperature of the corresponding section, the target output of the main pulse solenoid valve in each cooling temperature section is determined; Determine the first output of the gas bypass pulse solenoid valve in each cooling temperature section according to the deviation between the suction pressure of the corresponding section and the calibrated main line suction pressure; According to the deviation between the actual suction superheat and the suction superheat target value, the target output of the liquid bypass pulse solenoid valve in each cooling temperature section is determined; Determining a correction coefficient of the gas bypass pulse solenoid valve according to a target output of the liquid bypass pulse solenoid valve and a first output of the gas bypass pulse solenoid valve; Determining a target output of the gas bypass pulse solenoid valve according to the correction coefficient and a first output of the gas bypass pulse solenoid valve; Adjust the output of the main pulse solenoid valve according to the target output of the main pulse solenoid valve, adjust the output of the liquid bypass pulse solenoid valve according to the target output of the liquid bypass pulse solenoid valve, and adjust the output of the gas bypass pulse solenoid valve according to the target output of the gas bypass pulse solenoid valve; The target output of the main pulse solenoid valve is: … Among them, Z1, Z2, ..., Z n is the target output of the main pulse solenoid valve in each cooling temperature section, K1, K2, ..., K n are proportionality coefficients, I1, I2, ..., I n is the integral coefficient, D1, D2, ..., D n are differential coefficients, e1, e2, ..., e n is the temperature deviation determined by the deviation between the real-time temperature and the target temperature of the corresponding segment, τ is the time, Δt1, Δt2, ..., Δt n-1 is the cooling time corresponding to each cooling temperature section, T0 is the starting temperature, ΔT1, ΔT2, ..., ΔT n The total temperature range of the cooling is divided into n equal parts, T sv is the target temperature; the first output of the gas bypass pulse solenoid valve is: … g1(τ)=P min +ΔP1-P z1 g2(τ)=P min +ΔP1+ΔP2-P z2 … g n (τ)DP max -P zn , Among them, U1, U2, ..., U n is the first output of the gas bypass pulse solenoid valve in each cooling temperature section, K1′, K2′, ..., K n ′ is the proportionality coefficient, I1′, I2′, ..., I n ' is the integral coefficient, D1', D2', ..., D n ′ is the differential coefficient, g1, g2, ..., g n is the pressure deviation, τ is the time, Δt1, Δt2, ..., Δt n-1 is the cooling time corresponding to each cooling temperature section, T0 is the starting temperature, ΔT1, ΔT2, ..., ΔT n The total temperature range of the cooling is divided into n equal parts, T sv is the target temperature, P min is the minimum suction pressure, P max is the maximum suction pressure, P z1， P z2 , ..., P zn When only the main output is calibrated, the main suction pressure corresponding to different main outputs; The target output of the liquid bypass pulse solenoid valve is: … Among them, Q1, Q2, ..., Q n is the target output of the liquid bypass pulse solenoid valve in each cooling temperature section, K1", K2", ..., K n " is the proportionality coefficient, I1", I2", ..., I n " is the integral coefficient, D1", D2", ..., D n 〞 is the differential coefficient, q1, q2, ..., q n is the suction superheat deviation determined by the deviation between the actual suction superheat and the suction superheat target value, τ is time, Δt1, Δt2, ..., Δt n-1 is the cooling time corresponding to each cooling temperature section, T0 is the starting temperature, ΔT1, ΔT2, ..., ΔT n The total temperature range of the cooling is divided into n equal parts, T sv is the target temperature; The correction coefficient of the gas bypass pulse solenoid valve is: … Among them, m1, m2, ..., m n is the correction coefficient of the gas bypass pulse solenoid valve in each cooling temperature section, Q1, Q2, ..., Q n is the target output of the liquid bypass pulse solenoid valve in each cooling temperature section, U1, U2, ..., U n It is the first output of the gas bypass pulse solenoid valve in each cooling temperature section.

2. The linear temperature reduction control method of the environmental test chamber according to claim 1, characterized in that: The target output of the gas bypass pulse solenoid valve is: … Among them, G1, G2, …, G n It is the target output of the gas bypass pulse solenoid valve in each cooling temperature section.

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