A method, apparatus and system for controlling outlet superheat of a cold plate

Abstract

The embodiment of the present application discloses a kind of control method, device and system of cold plate outlet superheat degree.The control method of cold plate outlet superheat degree includes: obtaining the outlet temperature and outlet pressure of cold plate;According to outlet temperature and outlet pressure, the outlet superheat degree of cold plate is determined;According to outlet superheat degree, the opening of first electronic expansion valve and the opening of second electronic expansion valve are adjusted to control the outlet superheat degree of cold plate;The opening change rate of first electronic expansion valve is different from the opening change rate of second electronic expansion valve.The control method, device and system of cold plate outlet superheat degree provided by the embodiment of the present application can improve control efficiency.

Description

Technical Field

[0001] The embodiments of the present invention relate to refrigeration technology, and more particularly to a method, apparatus and system for controlling the superheat of a cold plate outlet. Background Technology

[0002] Cold plates, such as those in battery packs, are used to cool or heat the battery pack. The outlet superheat of the cold plate is a crucial factor affecting its cooling performance and needs to be controlled. Currently, the efficiency of existing methods for controlling the outlet superheat of cold plates needs improvement. Summary of the Invention

[0003] This invention provides a method, apparatus, and system for controlling the superheat of a cold plate outlet to improve control efficiency.

[0004] In a first aspect, embodiments of the present invention provide a method for controlling the superheat of a cold plate outlet. The control system for the cold plate outlet superheat 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, and the outlet of the compressor is connected to the inlet of the condenser. The outlet of the condenser is connected to the inlet of the cold plate through the pipelines containing the first and second electronic expansion valves. The control method is executed by the controller and includes:

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

[0006] The outlet superheat of the cold plate is determined based on the outlet temperature and the outlet pressure.

[0007] Based on the outlet superheat, the opening of the first electronic expansion valve and the opening of the second electronic expansion valve are adjusted to control the outlet superheat of the cold plate; the opening change rate of the first electronic expansion valve is different from that of the second electronic expansion valve.

[0008] Optionally, determining the outlet superheat of the cold plate based on the outlet temperature and the outlet pressure includes:

[0009] Based on the outlet pressure, determine the saturation temperature corresponding to the outlet pressure;

[0010] The difference between the outlet temperature and the saturation temperature is taken as the outlet superheat.

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

[0012] The difference between the outlet superheat and the target superheat is determined based on the outlet superheat and the target superheat.

[0013] When the difference between the outlet superheat and the target superheat exceeds a preset range, the opening of the second electronic expansion valve is controlled to increase or decrease at a preset second opening rate, while the opening of the first electronic expansion valve remains unchanged.

[0014] When the difference between the outlet superheat and the target superheat is within the preset range, the opening of the second electronic expansion valve is kept constant, and the opening of the first electronic expansion valve is increased or decreased at a preset first opening rate; the preset first opening rate is less than the preset second opening rate.

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

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

[0017] When the difference between the outlet superheat and the target superheat is lower than a preset second threshold, the opening of the second electronic expansion valve is controlled to decrease at a preset second opening 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, the following steps are included:

[0019] The first electronic expansion valve and the second electronic expansion valve are controlled to open and operate at their respective preset initial opening degrees.

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

[0021] When the operating time of the first electronic expansion valve and the second electronic expansion valve reaches the preset time, the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve are adjusted according to the outlet superheat.

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

[0023] Secondly, embodiments of the present invention provide a control device for the superheat of a cold plate outlet. The control system for the superheat of 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 containing the first electronic expansion valve and the second electronic expansion valve. The control device includes:

[0024] The parameter acquisition module is used to acquire the outlet temperature and outlet pressure of the cold plate.

[0025] The superheat determination module is used to determine the outlet superheat of the cold plate based on the outlet temperature and the outlet pressure.

[0026] The superheat control module is used to adjust the opening of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat, so as to control the outlet superheat of the cold plate; the opening rate of the first electronic expansion valve is less than the opening rate of the second electronic expansion valve.

[0027] Thirdly, embodiments of the present invention provide a control system for the superheat of a cold plate outlet, comprising: 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 containing the first electronic expansion valve and the second electronic expansion valve.

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

[0029] The present invention provides a method, apparatus, and system for controlling the outlet superheat of a cold plate. The control method includes: acquiring the outlet temperature and outlet pressure of the cold plate; determining the outlet superheat of the cold plate based on the outlet temperature and outlet pressure; adjusting the opening degree of a first electronic expansion valve and a second electronic expansion valve based on the outlet superheat to control the outlet superheat of the cold plate; wherein the opening change rate of the first electronic expansion valve is different from the opening change rate of the second electronic expansion valve. The method, apparatus, and system for controlling the outlet superheat of a cold plate provided in this invention adjust the opening of a first electronic expansion valve and a second electronic expansion valve according to the determined outlet superheat of the cold plate, thereby controlling the outlet superheat of the cold plate. Furthermore, the opening of the first and second electronic expansion valves is adjusted at different rates of change. For example, the opening of the second electronic expansion valve is adjusted significantly at a larger rate of change, while the opening of the first electronic expansion valve is adjusted slightly at a smaller rate of change. This accelerates the adjustment speed and thus speeds up the process of achieving the target outlet superheat of the cold plate. This solves the problem in the prior art where adjusting the opening of the first and second electronic expansion valves at the same rate of change results in a slow adjustment speed, leading to a longer time for the outlet superheat of the cold plate to reach the target superheat and lower control efficiency. Therefore, this invention improves control efficiency. Attached Figure Description

[0030] Figure 1 This is a flowchart of a method for controlling the superheat of a cold plate outlet provided in Embodiment 1 of the present invention;

[0031] Figure 2 This is a flowchart of a method for controlling the superheat of a cold plate outlet provided in Embodiment 2 of the present invention;

[0032] Figure 3 This is a structural block diagram of a device for controlling the superheat of a cold plate outlet provided in Embodiment 3 of the present invention;

[0033] Figure 4 This is a schematic diagram of a control system for the superheat of a cold plate outlet provided in Embodiment 3 of the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of an electronic device provided in Embodiment 4 of the present invention. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0036] Example 1

[0037] Figure 1 This is a flowchart of a method for controlling the superheat of a cold plate outlet according to Embodiment 1 of the present invention. This embodiment is applicable to controlling the superheat of cold plates, such as those in battery packs. The method can be executed by a controller in a cold plate outlet superheat control system, specifically by a control device integrated into the controller. This device can be implemented in software and / or hardware. The control system for cold plate outlet superheat 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 and second electronic expansion valves 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 containing the first and second electronic expansion valves. The method specifically includes the following steps:

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

[0039] The outlet of the cold plate is equipped with a pressure sensor and a temperature sensor. The control device for the superheat of 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 outlet superheat of the cold plate based on the outlet temperature and outlet pressure.

[0041] Specifically, based on the outlet pressure of the cold plate, the saturation temperature corresponding to the outlet pressure is determined, and the difference between the outlet temperature and the saturation temperature is taken as the outlet superheat.

[0042] Step 130: Adjust the opening 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 change rate of the first electronic expansion valve is different from that of the second electronic expansion valve.

[0043] Specifically, when the difference between the outlet superheat and the target superheat exceeds a preset range, the opening of the second electronic expansion valve is increased or decreased at a certain rate of change, while the opening of the first electronic expansion valve remains unchanged. When the difference between the outlet superheat and the target superheat is within a preset range, the opening of the second electronic expansion valve remains unchanged, while the opening of the first electronic expansion valve is increased or decreased at a certain rate of change; the rate of change of the opening of the first electronic expansion valve is less than that of the second electronic expansion valve. By adjusting the openings of the first and second electronic expansion valves at different rates of change, such as significantly adjusting the opening of the second electronic expansion valve at a larger rate of change and then slightly adjusting the opening of the first electronic expansion valve at a smaller rate of change, the opening adjustment speed is accelerated, thereby accelerating the response time of the cold plate outlet superheat and reducing the time for the cold plate outlet superheat to reach the target superheat, thus improving control efficiency.

[0044] It should be noted that the specific magnitude of the opening change rate of each electronic expansion valve in this embodiment can be determined according to the actual superheat control requirements, and is not limited here.

[0045] The method for controlling the outlet superheat of the cold plate provided in this embodiment includes: acquiring the outlet temperature and outlet pressure of the cold plate; determining the outlet superheat of the cold plate based on the outlet temperature and outlet pressure; adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve based on the outlet superheat to control the outlet superheat of the cold plate; the opening change rate of the first electronic expansion valve is different from the opening change rate of the second electronic expansion valve. The cold plate outlet superheat control method provided in this embodiment adjusts the opening of the first electronic expansion valve and the second electronic expansion valve according to the determined cold plate outlet superheat, thereby controlling the cold plate outlet superheat. The method adjusts the opening of the first and second electronic expansion valves at different rates of change. For example, the opening of the second electronic expansion valve is adjusted significantly at a larger rate of change, while the opening of the first electronic expansion valve is adjusted slightly at a smaller rate of change. This accelerates the opening adjustment speed, thereby speeding up the process of reaching the target cold plate outlet superheat. This solves the problem in the prior art where adjusting the opening of the first and second electronic expansion valves at the same rate of change results in a slow adjustment speed, leading to a longer time for the cold plate outlet superheat to reach the target superheat and lower control efficiency. Therefore, this method improves control efficiency.

[0046] Example 2

[0047] Figure 2This is a flowchart of a method for controlling the outlet superheat of a cold plate according to Embodiment 2 of the present invention. This embodiment can be applied to controlling the outlet superheat of cold plates, such as those in battery packs. The method can be executed by a controller in a cold plate outlet superheat control system, specifically by a cold plate outlet superheat control device integrated into the controller. This device can be implemented in 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, the outlet of the cold plate is equipped with a pressure sensor and a temperature sensor. The control device for the superheat of 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. In addition, 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 based on the outlet pressure.

[0051] 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 into the controller of the cold plate outlet superheat control system. The specific structure of the cold plate outlet superheat control system can be referred to the description of the above embodiment, and will not be repeated here.

[0052] Step 230: Based on the outlet temperature and the saturation temperature, the difference between the outlet temperature and the saturation temperature is taken as the outlet superheat.

[0053] Specifically, the temperature difference is obtained by subtracting the outlet temperature from the saturation temperature, and this temperature difference is the outlet superheat of the cold plate.

[0054] Step 240: Determine the difference between the outlet superheat and the target superheat based on the outlet superheat and the target superheat.

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

[0056] Specifically, the opening of the first electronic expansion valve remains unchanged at a preset initial opening during operation, while the opening of the second electronic expansion valve increases or decreases at a preset second opening rate. Specifically, when the difference between the outlet superheat and the target superheat is higher than a preset first threshold (e.g., 0.5K), the opening of the first electronic expansion valve is maintained at the preset initial opening during operation. The opening of the second electronic expansion valve can be increased at a preset second opening rate using PID control until the difference between the outlet superheat and the target superheat is lower than the preset first threshold. When the difference between the outlet superheat and the target superheat is lower than the preset second threshold (e.g., -0.5K), the opening of the first electronic expansion valve remains unchanged at the preset initial opening during operation. The opening of the second electronic expansion valve can be decreased at a preset second opening rate using PID control until the difference between the outlet superheat and the target superheat is higher than the preset second threshold. The preset first threshold is greater than the preset second threshold.

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

[0058] Specifically, the opening of the second electronic expansion valve remains unchanged at a preset initial opening during its operation, while the opening of the first electronic expansion valve increases or decreases at a preset first opening rate. Specifically, when the difference between the outlet superheat and the target superheat is within a preset range, such as -0.5K to 0.5K, the opening of the second electronic expansion valve is maintained at the preset initial opening during its operation. If the difference between the outlet superheat and the target superheat is less than zero, the opening of the first electronic expansion valve is controlled to decrease at a preset first opening rate using PID control until the outlet superheat reaches the target superheat. If the difference between the outlet superheat and the target superheat is greater than zero, the opening of the first electronic expansion valve is controlled to increase at a preset first opening rate using PID control until the outlet superheat reaches the target superheat.

[0059] Furthermore, when the operating time of the first electronic expansion valve and the second electronic expansion valve reaches a preset time, such as 30 seconds, the opening degree of the first electronic expansion valve and the second electronic expansion valve can be adjusted according to the above-described opening degree adjustment process of the first electronic expansion valve and the second electronic expansion valve.

[0060] It should be noted that the specific values ​​of each parameter in this embodiment, such as opening degree, time, and threshold, can be determined according to the actual superheat control requirements, and are not limited here.

[0061] The cold plate outlet superheat control method provided in this embodiment, when the difference between the cold plate outlet superheat and the target superheat exceeds a preset range, controls the opening of the second electronic expansion valve to increase or decrease at a preset second opening rate, while keeping the opening of the first electronic expansion valve unchanged; when the difference between the outlet superheat and the target superheat is within a preset range, controls the opening of the second electronic expansion valve to remain unchanged, while controlling the opening of the first electronic expansion valve to increase or decrease at a preset first opening rate. The preset first opening rate is less than the preset second opening rate, that is, the opening of the second electronic expansion valve is adjusted significantly at a larger opening rate, and then the opening of the first electronic expansion valve is adjusted slightly at a smaller opening rate, thereby accelerating the speed at which the cold plate outlet superheat reaches the target superheat. This solves the problem in the prior art where the opening of the first and second electronic expansion valves is adjusted at the same opening rate, resulting in a slow opening adjustment speed, a long time for the cold plate outlet superheat to reach the target superheat, and low control efficiency of the cold plate outlet superheat, thus improving control efficiency.

[0062] Example 3

[0063] Figure 3 This is a structural block diagram of a cold plate outlet superheat control device provided in Embodiment 3 of the present invention. The cold plate outlet superheat control device can be integrated into the controller of the cold plate outlet superheat control system, as shown in the reference diagram. Figure 3 The device for controlling the superheat at the outlet of the cold plate includes: a parameter acquisition module 310, a superheat determination module 320, and a superheat control module 330. The parameter acquisition module 310 acquires the outlet temperature and outlet pressure of the cold plate; the superheat determination module 320 determines the outlet superheat of the cold plate based on the outlet temperature and outlet pressure; the superheat control module 330 adjusts the opening 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 rate of change of the opening of the first electronic expansion valve is less than the rate of change of the opening of the second electronic expansion valve.

[0064] Based on the above implementation, the superheat determination module 320 includes: a saturation temperature determination unit and a superheat determination unit; wherein, the saturation temperature determination unit is used to determine the saturation temperature corresponding to the outlet pressure according to the outlet pressure; the superheat determination unit is used to take the difference between the outlet temperature and the saturation temperature as the outlet superheat 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 used to determine the difference between the outlet superheat and the target superheat based on the outlet superheat and the target superheat; the first opening control unit is used to control the opening of the second electronic expansion valve to increase or decrease at a preset second opening rate when the difference between the outlet superheat and the target superheat exceeds a preset range, and to control the opening of the first electronic expansion valve to remain unchanged; the second opening control unit is used to control the opening of the second electronic expansion valve to remain unchanged when the difference between the outlet superheat and the target superheat is within a preset range, and to control the opening of the first electronic expansion valve to increase or decrease at a preset first opening rate; the preset first opening rate is less than the preset second opening rate.

[0066] Optionally, the first opening control unit includes: a first opening control subunit and a second opening control subunit; wherein, the first opening control subunit is used to control the opening of the second electronic expansion valve to decrease at a preset second opening rate when the difference between the outlet superheat and the target superheat is higher than a preset first threshold; the second opening control subunit is used to control the opening of the second electronic expansion valve to increase at a preset second opening 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 of the cold plate outlet also includes an operation control module, which controls 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 used to adjust the opening degree of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat when the running time of the first electronic expansion valve and the second electronic expansion valve reaches the preset time.

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

[0070] In this system, the high-temperature refrigerant flowing out of the cold plate outlet is compressed into high-pressure refrigerant by the compressor CM. The high-pressure refrigerant then flows into the condenser EC, where it is condensed into low-temperature refrigerant. This low-temperature refrigerant flows into the cold plate inlet through the first electronic expansion valve EV1 and the second electronic expansion valve EV2, thus cooling the object being cooled by the cold plate, such as a battery pack. The controller can control the operating 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 processes for the opening degrees of the first and second electronic expansion valves EV1 and EV2 can be referred to in any of the above embodiments and will not be repeated 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 change rate of the first electronic expansion valve EV1 is less than that of the second electronic expansion valve EV2. The smaller opening change rate is suitable for selecting an electronic expansion valve with a smaller diameter, while the larger opening change rate is suitable for selecting an electronic expansion valve with a larger diameter, so as to match the diameter of the electronic expansion valve with the opening change rate.

[0073] Furthermore, temperature sensors TT and pressure sensors TV are installed at the inlet and outlet of the cold plate and in its surrounding environment, and each temperature sensor TT and each pressure sensor TV is electrically connected to the controller. The controller controls the opening degree of the first electronic expansion valve EV1 and the second electronic expansion valve EV2 based on 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 belong to the same inventive concept as the cold plate outlet superheat control method provided in any embodiment of the present invention, and have corresponding beneficial effects. For technical details not detailed in this embodiment, please refer to the cold plate outlet superheat control method provided in any embodiment of the present invention.

[0075] Example 4

[0076] Figure 5 This is a schematic diagram of the structure of an electronic device provided in Embodiment 4 of the present invention. Figure 5 A block diagram is shown of an exemplary electronic device 412 suitable for implementing embodiments of the present invention. Figure 5 The electronic device 412 shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of the present invention.

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

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

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

[0080] 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. Electronic device 412 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 434 may be used to read and write non-removable, non-volatile magnetic media (… Figure 5 Not shown; usually referred to as a "hard drive"). Although Figure 5Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk") and an optical disc drive for reading and writing to a removable non-volatile optical disc (e.g., a Compact Disc Read-Only Memory, CD-ROM), a Digital Video Disc Read-Only Memory, DVD-ROM, or other optical media may be provided. In these cases, each drive may be connected to bus 418 via one or more data media interfaces. Storage device 428 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments of the present invention.

[0081] A program / utility 440 having a set (at least one) of program modules 442 may be stored in, for example, a 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. Each or some combination of these examples may include an implementation of a network environment. Program modules 442 typically perform the functions and / or methods described in the embodiments of the present invention.

[0082] Electronic device 412 can also communicate with one or more external devices 414 (e.g., keyboard, pointing terminal, display 424, etc.), and with one or more terminals that enable a user to interact with the electronic device 412, and / or with any terminal that enables the electronic device 412 to communicate with one or more other computing terminals (e.g., network card, modem, etc.). This communication can be performed via input / output (I / O) interface 422. Furthermore, electronic device 412 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 420. Figure 5 As shown, network adapter 420 communicates with other modules of electronic device 412 via bus 418. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with 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.

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

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

[0085] Determine the outlet superheat of the cold plate based on the outlet temperature and outlet pressure;

[0086] Based on the outlet superheat, the opening of the first electronic expansion valve and the opening of the second electronic expansion valve are adjusted to control the outlet superheat of the cold plate; the opening change rate of the first electronic expansion valve is different from that of the second electronic expansion valve.

[0087] Example 5

[0088] Embodiment 5 of the present invention also provides a computer-readable storage medium having a computer program stored thereon. When executed by a processor, the program implements the method for controlling the superheat of the cold plate outlet as provided in 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 of the cold plate based on the outlet temperature and outlet pressure;

[0091] Based on the outlet superheat, the opening of the first electronic expansion valve and the opening of the second electronic expansion valve are adjusted to control the outlet superheat of the cold plate; the opening change rate of the first electronic expansion valve is different from that of the second electronic expansion valve.

[0092] The computer storage medium of this invention can be any combination of one or more computer-readable media. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A 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 thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0093] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs 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 suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0095] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or terminal. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0096] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, rearrangements, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for controlling superheat at the outlet of a cold plate, characterized in that, The control system for the superheat of 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 and second electronic expansion valves are located on different pipelines. The outlet of the cold plate is connected to the inlet of the compressor, and the outlet of the compressor is connected to the inlet of the condenser. The outlet of the condenser is connected to the inlet of the cold plate through the pipelines containing the first and second electronic expansion valves. The control method is executed by the controller and includes: Obtain the outlet temperature and outlet pressure of the cold plate; The outlet superheat of the cold plate is determined based on the outlet temperature and the outlet pressure. Based on the outlet superheat, the opening of the first electronic expansion valve and the opening of the second electronic expansion valve are adjusted to control the outlet superheat of the cold plate; the opening change rate of the first electronic expansion valve is different from that of the second electronic expansion valve. The step of adjusting the opening of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat includes: The difference between the outlet superheat and the target superheat is determined based on the outlet superheat and the target superheat. When the difference between the outlet superheat and the target superheat exceeds a preset range, the opening of the second electronic expansion valve is controlled to increase or decrease at a preset second opening rate, and the opening of the first electronic expansion valve is controlled to remain unchanged, wherein the opening of the first electronic expansion valve remains unchanged at a preset initial opening when the first electronic expansion valve is open. When the difference between the outlet superheat and the target superheat is within the preset range, the opening of the second electronic expansion valve is kept constant, and the opening of the first electronic expansion valve is increased or decreased at a preset first opening rate; the preset first opening rate is less than the preset second opening rate.

2. The control method according to claim 1, characterized in that, Determining the outlet superheat of the cold plate based on the outlet temperature and the outlet pressure includes: Based on the outlet pressure, determine the saturation temperature corresponding to the outlet pressure; The difference between the outlet temperature and the saturation temperature is taken as the outlet superheat.

3. The control method according to claim 1, characterized in that, When the difference between the outlet superheat and the target superheat exceeds a preset range, controlling the opening of the second electronic expansion valve to increase or decrease at a preset second opening rate includes: When the difference between the outlet superheat and the target superheat is higher than a preset first threshold, the opening of the second electronic expansion valve is controlled to increase at a preset second opening rate. When the difference between the outlet superheat and the target superheat is lower than a preset second threshold, the opening of the second electronic expansion valve is controlled to decrease at a preset second opening rate; the preset first threshold is greater than the preset second threshold.

4. The control method according to claim 1, characterized in that, Before obtaining the outlet temperature and outlet pressure of the cold plate, the following steps are included: The first electronic expansion valve and the second electronic expansion valve are controlled to open and operate at their respective preset initial opening degrees.

5. The control method according to claim 4, characterized in that, The step of adjusting the opening of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat includes: When the operating time of the first electronic expansion valve and the second electronic expansion valve reaches the preset time, the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve are adjusted according to the outlet superheat.

6. The control method according to claim 1, characterized in that, The cold plate is the cold plate of the battery pack.

7. A device for controlling the superheat of a cold plate outlet, characterized in that, The control system for the superheat of 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 and second electronic expansion valves are located on different pipelines. The outlet of the cold plate is connected to the inlet of the compressor, and the outlet of the compressor is connected to the inlet of the condenser. The outlet of the condenser is connected to the inlet of the cold plate through the pipelines containing the first and second electronic expansion valves. The control device includes: The parameter acquisition module is used to acquire the outlet temperature and outlet pressure of the cold plate. The superheat determination module is used to determine the outlet superheat of the cold plate based on the outlet temperature and the outlet pressure. The superheat control module is used to adjust the opening of the first electronic expansion valve and the second electronic expansion valve according to the outlet superheat, so as to control the outlet superheat of the cold plate; the opening change rate of the first electronic expansion valve is less than the opening change rate of the second electronic expansion valve; wherein, the difference between the outlet superheat and the target superheat is determined according to the outlet superheat and the target superheat. When the difference between the outlet superheat and the target superheat exceeds a preset range, the opening of the second electronic expansion valve is controlled to increase or decrease at a preset second opening rate, and the opening of the first electronic expansion valve is controlled to remain unchanged, wherein the opening of the first electronic expansion valve remains unchanged at a preset initial opening when the first electronic expansion valve is open. When the difference between the outlet superheat and the target superheat is within the preset range, the opening of the second electronic expansion valve is kept constant, and the opening of the first electronic expansion valve is increased or decreased at a preset first opening rate; the preset first opening rate is less than the preset second opening rate.

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