Method, device and system for controlling superheat degree of outlet of cold plate

Abstract

The embodiment of the invention discloses a control method, device and system for the superheat degree of a cold plate outlet. The cold plate outlet superheat degree control method comprises the steps that the outlet temperature and the outlet pressure of a cold plate are obtained; according to the outlet temperature and the outlet pressure, the outlet superheat degree of the cold plate is determined; according to the outlet superheat degree, the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve are adjusted so as to control the outlet superheat degree of the cold plate; and the opening change rate of the first electronic expansion valve is different from that of the second electronic expansion valve. According to the control method, device and system for the superheat degree of the cold plate outlet, the control efficiency can be improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to refrigeration technology, and in particular, to a method, device, and system for controlling the superheat at the cold plate outlet. Background Art

[0002] A cold plate, such as the cold plate of a battery pack, cools or heats the battery pack. The superheat at the cold plate outlet is an important factor affecting the refrigeration effect of the cold plate, and it is necessary to control the superheat at the cold plate outlet. Currently, the existing control methods for the superheat at the cold plate outlet need to improve the control efficiency. Summary of the Invention

[0003] The embodiments of the present invention provide a method, device, and system for controlling the superheat at the cold plate outlet to improve the control efficiency.

[0004] In a first aspect, the embodiments of the present invention provide a method for controlling the superheat at the cold plate outlet. The control system for the superheat at the cold plate outlet includes a compressor, a controller, a first electronic expansion valve, a second electronic expansion valve, and a condenser. The compressor, the first electronic expansion valve, and the second electronic expansion valve are all electrically connected to the controller. The first electronic expansion valve and the second electronic expansion valve are located in different pipelines. The outlet of the cold plate is communicated with the inlet of the compressor, the outlet of the compressor is communicated with the inlet of the condenser, and the outlet of the condenser is communicated with the inlet of the cold plate through the pipelines where the first electronic expansion valve and the second electronic expansion valve are located. The control method is executed by the controller, and the control method includes:

[0005] Obtain the outlet temperature and outlet pressure of the cold plate;

[0006] Determine the superheat at the cold plate outlet according to the outlet temperature and the outlet pressure;

[0007] Adjust the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the superheat at the cold plate outlet to control the superheat at the cold plate outlet; the opening degree change rate of the first electronic expansion valve is different from the opening degree change rate of the second electronic expansion valve.

[0008] Optionally, the determining the superheat at the cold plate outlet according to the outlet temperature and the outlet pressure includes:

[0009] Determine the saturation temperature corresponding to the outlet pressure according to the outlet pressure;

[0010] Take the difference between the outlet temperature and the saturation temperature as the superheat at the cold plate outlet according to the outlet temperature and the saturation temperature.

[0011] Optionally, adjusting the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat degree includes:

[0012] Determining the difference between the outlet superheat degree and the target superheat degree according to the outlet superheat degree and the target superheat degree;

[0013] When the difference between the outlet superheat degree and the target superheat degree exceeds a preset range, controlling the opening degree of the second electronic expansion valve to increase or decrease at a preset second opening degree change rate, and controlling the opening degree of the first electronic expansion valve to remain unchanged;

[0014] When the difference between the outlet superheat degree and the target superheat degree is within the preset range, controlling the opening degree of the second electronic expansion valve to remain unchanged, and controlling the opening degree of the first electronic expansion valve to increase or decrease at a preset first opening degree change rate; the preset first opening degree change rate is less than the preset second opening degree change rate.

[0015] Optionally, when the difference between the outlet superheat degree and the target superheat degree exceeds a preset range, controlling the opening degree of the second electronic expansion valve to increase or decrease at a preset second opening degree change rate includes:

[0016] When the difference between the outlet superheat degree and the target superheat degree is higher than a preset first threshold, controlling the opening degree of the second electronic expansion valve to increase at a preset second opening degree change rate;

[0017] When the difference between the outlet superheat degree and the target superheat degree is lower than a preset second threshold, controlling the opening degree of the second electronic expansion valve to decrease at a preset second opening degree change rate; the preset first threshold is greater than the preset second threshold.

[0018] Optionally, before obtaining the outlet temperature and outlet pressure of the cold plate, it includes:

[0019] Controlling the first electronic expansion valve and the second electronic expansion valve to start running with their respective preset initial opening degrees.

[0020] Optionally, adjusting the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat degree includes:

[0021] When the running time of the first electronic expansion valve and the second electronic expansion valve reaches a preset time, adjusting the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat degree.

[0022] Optionally, the cold plate is the cold plate of the battery pack.

[0023] Second aspect, an embodiment of the present invention provides a control device for the superheat at the cold plate outlet. The control system for the superheat at the cold plate outlet includes a compressor, a controller, a first electronic expansion valve, a second electronic expansion valve, and a condenser. The compressor, the first electronic expansion valve, and the second electronic expansion valve are all electrically connected to the controller. The first electronic expansion valve and the second electronic expansion valve are located in different pipelines. The outlet of the cold plate is communicated with the inlet of the compressor, the outlet of the compressor is communicated with the inlet of the condenser, and the outlet of the condenser is communicated with the inlet of the cold plate through the pipelines where the first electronic expansion valve and the second electronic expansion valve are located; the control device includes:

[0024] A parameter acquisition module, configured to acquire the outlet temperature and outlet pressure of the cold plate;

[0025] A superheat determination module, configured to determine the superheat at the cold plate outlet according to the outlet temperature and the outlet pressure;

[0026] A superheat control module, configured to adjust the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat to control the superheat at the cold plate outlet; the change rate of the opening degree of the first electronic expansion valve is less than the change rate of the opening degree of the second electronic expansion valve.

[0027] Third aspect, an embodiment of the present invention provides a control system for the superheat at the cold plate outlet, including: a compressor, a controller, a first electronic expansion valve, a second electronic expansion valve, and a condenser. The compressor, the first electronic expansion valve, and the second electronic expansion valve are all electrically connected to the controller. The first electronic expansion valve and the second electronic expansion valve are located in different pipelines. The outlet of the cold plate is communicated with the inlet of the compressor, the outlet of the compressor is communicated with the inlet of the condenser, and the outlet of the condenser is communicated with the inlet of the cold plate through the pipelines where the first electronic expansion valve and the second electronic expansion valve are located.

[0028] Optionally, the caliber of the first electronic expansion valve is smaller than the caliber of the second electronic expansion valve.

[0029] The control method, device and system for the superheat degree at the cold plate outlet provided by the embodiments of the present invention. The control method includes: obtaining the outlet temperature and outlet pressure of the cold plate; determining the superheat degree at the cold plate outlet according to the outlet temperature and outlet pressure; adjusting the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the superheat degree at the cold plate outlet to control the superheat degree at the cold plate outlet; the opening degree change rate of the first electronic expansion valve is different from that of the second electronic expansion valve. The control method, device and system for the superheat degree at the cold plate outlet provided by the embodiments of the present invention adjust the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the determined superheat degree at the cold plate outlet to control the superheat degree at the cold plate outlet, and adjust the opening degrees of the first electronic expansion valve and the second electronic expansion valve at different opening degree change rates. For example, the opening degree of the second electronic expansion valve is adjusted significantly at a larger opening degree change rate, and then the opening degree of the first electronic expansion valve is adjusted slightly at a smaller opening degree change rate, which speeds up the opening degree adjustment speed, thereby accelerating the speed at which the superheat degree at the cold plate outlet reaches the target superheat degree, and solving the problem in the prior art that the opening degrees of the first electronic expansion valve and the second electronic expansion valve are adjusted at the same opening degree change rate, resulting in a slower opening degree adjustment speed, a longer time for the superheat degree at the cold plate outlet to reach the target superheat degree, and a lower control efficiency for the superheat degree at the cold plate outlet, thus improving the control efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 FIG. 6 is a flowchart of a control method for the superheat degree at the cold plate outlet provided by Embodiment 1 of the present invention;

[0031] Figure 2 FIG. 10 is a flowchart of a control method for the superheat degree at the cold plate outlet provided by Embodiment 2 of the present invention;

[0032] Figure 3 FIG. 14 is a structural block diagram of a control device for the superheat degree at the cold plate outlet provided by Embodiment 3 of the present invention;

[0033] Figure 4 FIG. 18 is a structural schematic diagram of a control system for the superheat degree at the cold plate outlet provided by Embodiment 3 of the present invention;

[0034] Figure 5 FIG. 22 is a structural schematic diagram of an electronic device provided by Embodiment 4 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of convenience of description, only parts related to the present invention are shown in the drawings rather than all the structures.

[0036] Embodiment 1

[0037] Figure 1 It is a flowchart of a method for controlling the superheat degree at the cold plate outlet provided in the first embodiment of the present invention. This embodiment is applicable to aspects such as controlling the superheat degree at the outlet of a cold plate, such as the cold plate of a battery pack. This method can be executed by a controller in a control system for the superheat degree at the cold plate outlet, and specifically can be executed by a control device for the superheat degree at the cold plate outlet integrated in the controller. This device can be implemented in the form of software and / or hardware. The control system for the superheat degree at the cold plate outlet includes a compressor, a controller, a first electronic expansion valve, a second electronic expansion valve, and a condenser. The compressor, the first electronic expansion valve, and the second electronic expansion valve are all electrically connected to the controller. The first electronic expansion valve and the second electronic expansion valve are located in different pipelines. The outlet of the cold plate is communicated with the inlet of the compressor, the outlet of the compressor is communicated with the inlet of the condenser, and the outlet of the condenser is communicated with the inlet of the cold plate through the pipelines where the first electronic expansion valve and the second electronic expansion valve are located. The method specifically includes the following steps:

[0038] Step 110: Obtain the outlet temperature and outlet pressure of the cold plate.

[0039] Among them, a pressure sensor and a temperature sensor are arranged at the outlet of the cold plate. The control device for the superheat degree at the cold plate outlet is electrically connected to the pressure sensor and the temperature sensor to obtain the outlet pressure of the cold plate collected by the pressure sensor and the outlet temperature of the cold plate collected by the temperature sensor.

[0040] Step 120: Determine the superheat degree at the cold plate outlet according to the outlet temperature and outlet pressure.

[0041] Specifically, according to the outlet pressure of the cold plate, determine the saturation temperature corresponding to the outlet pressure. According to the outlet temperature and the saturation temperature, take the difference between the outlet temperature and the saturation temperature as the superheat degree at the outlet.

[0042] Step 130: Adjust the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve according to the superheat degree at the outlet to control the superheat degree at the cold plate outlet; the opening degree change rate of the first electronic expansion valve is different from the opening degree change rate of the second electronic expansion valve.

[0043] Specifically, when the difference between the outlet superheat and the target superheat exceeds the preset range, control the opening degree of the second electronic expansion valve to increase or decrease at a certain opening degree change rate, and control the opening degree of the first electronic expansion valve to remain unchanged. When the difference between the outlet superheat and the target superheat is within the preset range, control the opening degree of the second electronic expansion valve to remain unchanged, and control the opening degree of the first electronic expansion valve to increase or decrease at a certain opening degree change rate; the opening degree change rate of the first electronic expansion valve is less than that of the second electronic expansion valve. By adjusting the opening degrees of the first electronic expansion valve and the second electronic expansion valve to increase or decrease at different opening degree change rates, such as adjusting the opening degree of the second electronic expansion valve by a large margin at a large opening degree change rate, and then adjusting the opening degree of the first electronic expansion valve by a small margin at a small opening degree change rate, the opening degree adjustment speed can be accelerated, thereby accelerating the response time of the cold plate outlet superheat, making the time for the cold plate outlet superheat to reach the target superheat shorter, and thus improving the control efficiency.

[0044] It should be noted that the specific magnitudes of the opening degree change rates of the electronic expansion valves in this embodiment can be determined according to the actual superheat control requirements and are not limited herein.

[0045] The control method for the cold plate outlet superheat provided in this embodiment includes: obtaining the outlet temperature and outlet pressure of the cold plate; determining the outlet superheat of the cold plate according to the outlet temperature and outlet pressure; adjusting the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat to control the outlet superheat of the cold plate; the opening degree change rate of the first electronic expansion valve is different from that of the second electronic expansion valve. The control method for the cold plate outlet superheat provided in this embodiment adjusts the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the determined outlet superheat of the cold plate to control the outlet superheat of the cold plate, and adjusts the opening degrees of the first electronic expansion valve and the second electronic expansion valve at different opening degree change rates, such as adjusting the opening degree of the second electronic expansion valve by a large margin at a large opening degree change rate, and then adjusting the opening degree of the first electronic expansion valve by a small margin at a small opening degree change rate, to accelerate the opening degree adjustment speed, thereby accelerating the speed at which the cold plate outlet superheat reaches the target superheat, and solving the problem in the prior art that the opening degrees of the first electronic expansion valve and the second electronic expansion valve are adjusted at the same opening degree change rate, resulting in a slow opening degree adjustment speed, a long time for the cold plate outlet superheat to reach the target superheat, and a low control efficiency for the cold plate outlet superheat, thereby improving the control efficiency.

[0046] Embodiment 2

[0047] Figure 2FIG. 0 is a flowchart of a method for controlling the superheat degree at the cold plate outlet provided in Embodiment 2 of the present invention. This embodiment is applicable to aspects such as controlling the superheat degree at the cold plate outlet of a cold plate, such as the cold plate of a battery pack. This method can be executed by a controller in a control system for the superheat degree at the cold plate outlet, specifically by a control device for the superheat degree at the cold plate outlet integrated in the controller. This device can be implemented in the form of software and / or hardware. The method specifically includes the following steps:

[0048] Step 210: Obtain the outlet temperature and outlet pressure of the cold plate.

[0049] Specifically, a pressure sensor and a temperature sensor are provided at the outlet of the cold plate. The control device for the superheat degree at the cold plate outlet is electrically connected to the pressure sensor and the temperature sensor to obtain the outlet pressure of the cold plate collected by the pressure sensor and the outlet temperature of the cold plate collected by the temperature sensor. Additionally, before obtaining the outlet temperature and outlet pressure of the cold plate, the first electronic expansion valve and the second electronic expansion valve can be controlled to open and operate at their respective preset initial opening degrees.

[0050] Step 220: Determine the saturation temperature corresponding to the outlet pressure according to the outlet pressure.

[0051] Among them, the saturation temperature corresponding to the outlet pressure of the cold plate can be obtained by looking up a table. The table records the saturation temperatures corresponding to different outlet pressures, and this table can be pre-input to the controller in the control system for the superheat degree at the cold plate outlet. The specific structure of the control system for the superheat degree at the cold plate outlet can refer to the description of the above embodiment and will not be elaborated here.

[0052] Step 230: Take the difference between the outlet temperature and the saturation temperature as the superheat degree at the outlet according to the outlet temperature and the saturation temperature.

[0053] Specifically, the difference between the outlet temperature and the saturation temperature is obtained to get a temperature difference, and this temperature difference is the superheat degree at the cold plate outlet.

[0054] Step 240: Determine the difference between the superheat degree at the outlet and the target superheat degree according to the superheat degree at the outlet and the target superheat degree.

[0055] Step 250: When the difference between the superheat degree at the outlet and the target superheat degree exceeds a preset range, control the opening degree of the second electronic expansion valve to increase or decrease at a preset second opening degree change rate, and control the opening degree of the first electronic expansion valve to remain unchanged.

[0056] Among them, the opening degree of the first electronic expansion valve remains unchanged at the preset initial opening degree when the first electronic expansion valve is in the open operation state, and the opening degree of the second electronic expansion valve increases or decreases at a preset second opening degree change rate. Specifically, when the difference between the outlet superheat degree and the target superheat degree is higher than a preset first threshold value such as 0.5 K, control the opening degree of the first electronic expansion valve to remain unchanged at the preset initial opening degree when the first electronic expansion valve is in the open operation state, and the opening degree of the second electronic expansion valve can be controlled to increase at a preset second opening degree change rate through a PID control method until the difference between the outlet superheat degree and the target superheat degree is lower than the preset first threshold value; when the difference between the outlet superheat degree and the target superheat degree is lower than a preset second threshold value such as -0.5 K, control the opening degree of the first electronic expansion valve to remain unchanged at the preset initial opening degree when the first electronic expansion valve is in the open operation state, and the opening degree of the second electronic expansion valve can be controlled to decrease at a preset second opening degree change rate through a PID control method until the difference between the outlet superheat degree and the target superheat degree is higher than the preset second threshold value; the preset first threshold value is greater than the preset second threshold value.

[0057] Step 260, when the difference between the outlet superheat degree and the target superheat degree is within a preset range, control the opening degree of the second electronic expansion valve to remain unchanged, and control the opening degree of the first electronic expansion valve to increase or decrease at a preset first opening degree change rate; the preset first opening degree change rate is less than the preset second opening degree change rate.

[0058] Among them, the opening degree of the second electronic expansion valve remains unchanged at the preset initial opening degree when the second electronic expansion valve is in the open operation state, and the opening degree of the first electronic expansion valve increases or decreases at a preset first opening degree change rate. Specifically, when the difference between the outlet superheat degree and the target superheat degree is within a preset range such as -0.5 K to 0.5 K, control the opening degree of the second electronic expansion valve to remain unchanged at the preset initial opening degree when the second electronic expansion valve is in the open operation state. If the difference between the outlet superheat degree and the target superheat degree is less than zero, the opening degree of the first electronic expansion valve can be controlled to decrease at a preset first opening degree change rate through a PID control method until the outlet superheat degree reaches the target superheat degree; if the difference between the outlet superheat degree and the target superheat degree is greater than zero, the opening degree of the first electronic expansion valve can be controlled to increase at a preset first opening degree change rate through a PID control method until the outlet superheat degree reaches the target superheat degree.

[0059] Further, when the operation time of the first electronic expansion valve and the second electronic expansion valve reaches a preset time such as 30 s, the opening degrees of the first electronic expansion valve and the second electronic expansion valve can be adjusted according to the above-mentioned opening degree adjustment process of the first electronic expansion valve and the second electronic expansion valve.

[0060] It should be noted that the specific magnitudes of the parameters such as the opening degree, time, and threshold value in this embodiment can be determined according to the actual superheat degree control requirements and are not limited herein.

[0061] The control method for the superheat degree at the cold plate outlet provided in this embodiment controls the opening degree of the second electronic expansion valve to increase or decrease at a preset second opening degree change rate and keeps the opening degree of the first electronic expansion valve unchanged when the difference between the superheat degree at the cold plate outlet and the target superheat degree exceeds the preset range; when the difference between the outlet superheat degree and the target superheat degree is within the preset range, it controls the opening degree of the second electronic expansion valve to remain unchanged and controls the opening degree of the first electronic expansion valve to increase or decrease at a preset first opening degree change rate; the preset first opening degree change rate is less than the preset second opening degree change rate, that is, it adjusts the opening degree of the second electronic expansion valve by a large margin at a larger opening degree change rate, and then adjusts the opening degree of the first electronic expansion valve by a small margin at a smaller opening degree change rate, accelerating the speed at which the superheat degree at the cold plate outlet reaches the target superheat degree, solving the problem in the prior art that the opening degrees of the first electronic expansion valve and the second electronic expansion valve are adjusted at the same opening degree change rate, resulting in a slow opening degree adjustment speed, a long time for the superheat degree at the cold plate outlet to reach the target superheat degree, and a low control efficiency for the superheat degree at the cold plate outlet, thereby improving the control efficiency.

[0062] Embodiment III

[0063] Figure 3 It is a structural block diagram of a control device for the superheat degree at the cold plate outlet provided in Embodiment III of the present invention. The control device for the superheat degree at the cold plate outlet can be integrated in the controller of the control system for the superheat degree at the cold plate outlet. Refer to Figure 3 , the control device for the superheat degree at the cold plate outlet includes: a parameter acquisition module 310, a superheat degree determination module 320, and a superheat degree control module 330. Among them, the parameter acquisition module 310 is used to acquire the outlet temperature and outlet pressure of the cold plate; the superheat degree determination module 320 is used to determine the superheat degree at the cold plate outlet according to the outlet temperature and outlet pressure; the superheat degree control module 330 is used to adjust the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat degree to control the superheat degree at the cold plate outlet; the opening degree change rate of the first electronic expansion valve is less than the opening degree change rate of the second electronic expansion valve.

[0064] On the basis of the above implementation manner, the superheat degree determination module 320 includes: a saturation temperature determination unit and a superheat degree determination unit; among them, the saturation temperature determination unit is used to determine the saturation temperature corresponding to the outlet pressure according to the outlet pressure; the superheat degree determination unit is used to take the difference between the outlet temperature and the saturation temperature as the outlet superheat degree according to the outlet temperature and the saturation temperature.

[0065] In one embodiment, the superheat control module 330 includes: a difference determination unit, a first opening control unit, and a second opening control unit; wherein, the difference determination unit is configured to determine the difference between the outlet superheat and the target superheat according to the outlet superheat and the target superheat; the first opening control unit is configured to control the opening of the second electronic expansion valve to increase or decrease at a preset second opening change rate and keep the opening of the first electronic expansion valve unchanged when the difference between the outlet superheat and the target superheat exceeds a preset range; the second opening control unit is configured to keep the opening of the second electronic expansion valve unchanged and control the opening of the first electronic expansion valve to increase or decrease at a preset first opening change rate when the difference between the outlet superheat and the target superheat is within the preset range; the preset first opening change rate is less than the preset second opening change rate.

[0066] Optionally, the first opening control unit includes: a first opening control sub-unit and a second opening control sub-unit; wherein, the first opening control sub-unit is configured to control the opening of the second electronic expansion valve to decrease at a preset second opening change rate when the difference between the outlet superheat and the target superheat is higher than a preset first threshold; the second opening control sub-unit is configured to control the opening of the second electronic expansion valve to increase at a preset second opening change rate when the difference between the outlet superheat and the target superheat is lower than a preset second threshold; the preset first threshold is greater than the preset second threshold.

[0067] Optionally, the control device for the superheat at the cold plate outlet further includes an operation control module, configured to control the first electronic expansion valve and the second electronic expansion valve to open and operate at their respective preset initial openings before the parameter acquisition module acquires the outlet temperature and outlet pressure of the cold plate.

[0068] Optionally, the superheat control module is specifically configured to adjust the opening of the first electronic expansion valve and the opening of the second electronic expansion valve according to the outlet superheat when the operation time of the first electronic expansion valve and the second electronic expansion valve reaches a preset time.

[0069] Figure 4 It is a schematic structural diagram of a control system for the superheat at the cold plate outlet provided in Embodiment 3 of the present invention. Refer to Figure 4 , the control system for the superheat at the cold plate outlet includes: a compressor CM, a controller (not shown in the figure), a first electronic expansion valve EV1, a second electronic expansion valve EV2, and a condenser EC. The compressor CM, the first electronic expansion valve EV1, and the second electronic expansion valve EV2 are all electrically connected to the controller. The first electronic expansion valve EV1 and the second electronic expansion valve EV2 are located in different pipelines. The outlet of the cold plate is communicated with the inlet of the compressor CM. The outlet of the compressor CM is communicated with the inlet of the condenser EC. The outlet of the condenser EC is communicated with the inlet of the cold plate through the pipelines where the first electronic expansion valve EV1 and the second electronic expansion valve EV2 are located.

[0070] Among them, the high-temperature refrigerant flowing out of the outlet of the cold plate is compressed into a high-pressure refrigerant by the compressor CM. The high-pressure refrigerant flows into the condenser EC and is condensed into a low-temperature refrigerant through the condenser EC. The low-temperature refrigerant flows into the inlet of the cold plate through the first electronic expansion valve EV1 and the second electronic expansion valve EV2, so that the low-temperature refrigerant flowing into the cold plate cools the object to be cooled by the cold plate, such as a battery pack. The controller can control the working state of the compressor CM, the opening degree of the first electronic expansion valve EV1, and the opening degree of the second electronic expansion valve EV2. The control process of the opening degree of the first electronic expansion valve EV1 and the control process of the opening degree of the second electronic expansion valve EV2 can refer to any of the above embodiments and will not be elaborated here.

[0071] Optionally, the diameter of the first electronic expansion valve EV1 is smaller than the diameter of the second electronic expansion valve EV2.

[0072] Among them, the opening degree change rate of the first electronic expansion valve EV1 is smaller than the opening degree change rate of the second electronic expansion valve EV2. A smaller opening degree change rate is suitable for selecting an electronic expansion valve with a smaller diameter, and a larger opening degree change rate is suitable for selecting an electronic expansion valve with a larger diameter, so that the diameter of the electronic expansion valve matches the opening degree change rate.

[0073] Moreover, temperature sensors TT and pressure sensors TV are provided at the inlet and outlet of the cold plate and in its surrounding environment. Each temperature sensor TT and each pressure sensor TV are electrically connected to the controller. The controller controls the opening degree of the first electronic expansion valve EV1 and the opening degree of the second electronic expansion valve EV2 according to the temperature collected by each temperature sensor TT and the pressure collected by each pressure sensor TV.

[0074] The cold plate outlet superheat control device and system provided in this embodiment and the cold plate outlet superheat control method provided in any embodiment of the present invention belong to the same inventive concept and have corresponding beneficial effects. For the technical details not elaborated in this embodiment, refer to the cold plate outlet superheat control method provided in any embodiment of the present invention.

[0075] Embodiment 4

[0076] Figure 5 It is a schematic structural diagram of an electronic device provided in Embodiment 4 of the present invention. Figure 5 The block diagram of an exemplary electronic device 412 suitable for implementing the embodiments of the present invention is shown. Figure 5 The displayed electronic device 412 is only an example and should not impose any limitation on the functions and usage scope of the embodiments of the present invention.

[0077] Such as Figure 5As shown, the electronic device 412 is presented in the form of a general-purpose device. The components of the electronic device 412 may include, but are not limited to: one or more processors 416, a storage device 428, and a bus 418 that connects different system components (including the storage device 428 and the processor 416).

[0078] The bus 418 represents one or more of several types of bus architectures, including a storage device bus or storage device controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus architectures. By way of example, these architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.

[0079] The electronic device 412 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the electronic device 412, including volatile and non-volatile media, removable and non-removable media.

[0080] The storage device 428 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM) 430 and / or cache memory 432. The electronic device 412 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, a storage system 434 may be used for reading and writing on a non-removable, non-volatile magnetic medium ( Figure 5 not shown, commonly referred to as a "hard disk drive"). Although Figure 5Not shown in the figure, a disk drive for reading and writing a removable non-volatile disk (such as a "floppy disk") and an optical disk drive for reading and writing a removable non-volatile optical disk, such as a Compact Disc Read-Only Memory (CD-ROM), a Digital Video Disc-Read Only Memory (DVD-ROM), or other optical media, can be provided. In these cases, each drive can be connected to the bus 418 through one or more data medium interfaces. The storage device 428 can include at least one program product having a set (such as at least one) of program modules configured to execute the functions of the embodiments of the present invention.

[0081] A program / utility 440 having a set (at least one) of program modules 442 can be stored, for example, in the storage device 428. Such program modules 442 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. An implementation of a network environment may be included in each or some combination of these examples. The program modules 442 generally execute the functions and / or methods in the embodiments described in the present invention.

[0082] The electronic device 412 can also communicate with one or more external devices 414 (such as a keyboard, a pointing terminal, a display 424, etc.), and can also communicate with one or more terminals that enable a user to interact with the electronic device 412, and / or communicate with any terminal that enables the electronic device 412 to communicate with one or more other computing terminals (such as a network card, a modem, etc.). Such communication can be carried out through an input / output (I / O) interface 422. Also, the electronic device 412 can communicate with one or more networks (such as a Local Area Network (LAN), a Wide Area Network (WAN), and / or a public network, such as the Internet) through a network adapter 420. As Figure 5 shown, the network adapter 420 communicates with other modules of the electronic device 412 through the bus 418. It should be understood that although not shown in the figure, other hardware and / or software modules can be used in combination with the electronic device 412, including but not limited to: microcode, terminal drivers, redundant processors, external disk drive arrays, Redundant Arrays of Independent Disks (RAID) systems, tape drives, and data backup storage systems, etc.

[0083] The processor 416 (which is equivalent to the controller in the control system of the cold plate outlet superheat degree) executes various functional applications and data processing by running the program stored in the storage device 428, such as implementing the control method of the cold plate outlet superheat degree provided by the embodiments of the present invention. The method includes:

[0084] Obtain the outlet temperature and outlet pressure of the cold plate;

[0085] Determine the outlet superheat degree of the cold plate according to the outlet temperature and outlet pressure;

[0086] Adjust the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat degree to control the outlet superheat degree of the cold plate; the opening degree change rate of the first electronic expansion valve is different from that of the second electronic expansion valve.

[0087] Embodiment Five

[0088] Embodiment Five of the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it implements the control method of the cold plate outlet superheat degree provided by the embodiments of the present invention. The method includes:

[0089] Obtain the outlet temperature and outlet pressure of the cold plate;

[0090] Determine the outlet superheat degree of the cold plate according to the outlet temperature and outlet pressure;

[0091] Adjust the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat degree to control the outlet superheat degree of the cold plate; the opening degree change rate of the first electronic expansion valve is different from that of the second electronic expansion valve.

[0092] The computer storage medium of the embodiments of the present invention can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the computer-readable storage medium include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the computer-readable storage medium can be any tangible medium that contains or stores a program, and the program can be used by or in combination with an instruction execution system, apparatus, or device.

[0093] A computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which computer-readable program code is carried. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device.

[0094] The program code contained on a computer-readable medium may be transmitted using any appropriate medium, including - but not limited to - wireless, wire, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0095] The computer program code for performing the operations of the present invention may be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or terminal. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0096] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-modulations, combinations, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments may be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A control method for the superheat degree at the cold plate outlet, characterized in that The superheat control system at the cold plate outlet includes a compressor, a controller, a first electronic expansion valve, a second electronic expansion valve, and a condenser. The compressor, the first electronic expansion valve, and the second electronic expansion valve are all electrically connected to the controller. The first electronic expansion valve and the second electronic expansion valve are located in different pipelines. The outlet of the cold plate is connected to the inlet of the compressor, the outlet of the compressor is connected to the inlet of the condenser, and the outlet of the condenser is connected to the inlet of the cold plate through the pipelines where the first electronic expansion valve and the second electronic expansion valve are located. The control method is executed by the controller, and the control method includes: Obtain the outlet temperature and outlet pressure of the cold plate; Determine the superheat at the cold plate outlet based on the outlet temperature and the outlet pressure; Adjust the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the superheat at the cold plate outlet to control the superheat at the cold plate outlet. The opening degree change rate of the first electronic expansion valve is different from that of the second electronic expansion valve.

2. The control method according to claim 1, characterized in that, The step of determining the superheat at the cold plate outlet based on the outlet temperature and the outlet pressure includes: Determine the saturation temperature corresponding to the outlet pressure based on the outlet pressure; Take the difference between the outlet temperature and the saturation temperature as the superheat at the cold plate outlet based on the outlet temperature and the saturation temperature.

3. The control method according to claim 1, characterized in that, The step of adjusting the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the superheat at the cold plate outlet includes: Determine the difference between the superheat at the cold plate outlet and the target superheat based on the superheat at the cold plate outlet and the target superheat; When the difference between the superheat at the cold plate outlet and the target superheat exceeds the preset range, control the opening degree of the second electronic expansion valve to increase or decrease at a preset second opening degree change rate, and keep the opening degree of the first electronic expansion valve unchanged; When the difference between the superheat at the cold plate outlet and the target superheat is within the preset range, keep the opening degree of the second electronic expansion valve unchanged, and control the opening degree of the first electronic expansion valve to increase or decrease at a preset first opening degree change rate. The preset first opening degree change rate is less than the preset second opening degree change rate.

4. The control method according to claim 3, wherein The step of, when the difference between the superheat at the cold plate outlet and the target superheat exceeds the preset range, controlling the opening degree of the second electronic expansion valve to increase or decrease at a preset second opening degree change rate includes: When the difference between the superheat at the cold plate outlet and the target superheat is higher than the preset first threshold, control the opening degree of the second electronic expansion valve to increase at a preset second opening degree change rate; When the difference between the superheat at the cold plate outlet and the target superheat is lower than the preset second threshold, control the opening degree of the second electronic expansion valve to decrease at a preset second opening degree change rate. The preset first threshold is greater than the preset second threshold.

5. The control method according to claim 1, wherein Before obtaining the outlet temperature and outlet pressure of the cold plate, it includes: Control the first electronic expansion valve and the second electronic expansion valve to open and operate at their respective preset initial opening degrees.

6. The control method according to claim 5, characterized in that Adjusting the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat degree includes: When the operating times of the first electronic expansion valve and the second electronic expansion valve reach a preset time, adjusting the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat degree.

7. The control method according to claim 1, wherein The cold plate is the cold plate of the battery pack.

8. A control device for the superheat degree at the cold plate outlet, characterized in that, The control system for the cold plate outlet superheat degree includes a compressor, a controller, a first electronic expansion valve, a second electronic expansion valve, and a condenser. The compressor, the first electronic expansion valve, and the second electronic expansion valve are all electrically connected to the controller. The first electronic expansion valve and the second electronic expansion valve are located in different pipelines. The outlet of the cold plate is communicated with the inlet of the compressor. The outlet of the compressor is communicated with the inlet of the condenser. The outlet of the condenser is communicated with the inlet of the cold plate through the pipelines where the first electronic expansion valve and the second electronic expansion valve are located. The control device includes: A parameter acquisition module for acquiring the outlet temperature and outlet pressure of the cold plate; A superheat degree determination module for determining the outlet superheat degree of the cold plate according to the outlet temperature and the outlet pressure; A superheat degree control module for adjusting the opening degrees of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat degree to control the outlet superheat degree of the cold plate; the opening degree change rate of the first electronic expansion valve is less than the opening degree change rate of the second electronic expansion valve.

9. A control system for the superheat degree at the cold plate outlet, characterized in that, including: A compressor, a controller, a first electronic expansion valve, a second electronic expansion valve, and a condenser. The compressor, the first electronic expansion valve, and the second electronic expansion valve are all electrically connected to the controller. The first electronic expansion valve and the second electronic expansion valve are located in different pipelines. The outlet of the cold plate is communicated with the inlet of the compressor. The outlet of the compressor is communicated with the inlet of the condenser. The outlet of the condenser is communicated with the inlet of the cold plate through the pipelines where the first electronic expansion valve and the second electronic expansion valve are located.

10. The control system according to claim 9, wherein, The caliber of the first electronic expansion valve is smaller than the caliber of the second electronic expansion valve.

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