Engineering vehicle thermal management system adjusting method and device and medium

Abstract

The invention discloses an engineering vehicle thermal management system adjusting method and device and a medium, and is applied to a thermal management adjusting system.The method comprises the steps that the suction pressure corresponding to a compressor is collected; if the suction pressure is smaller than the first pressure threshold value and the rotating speed of the compressor is lower than the preset high rotating speed interval, the opening value of the first expansion valve is increased till the suction pressure is higher than the first pressure threshold value; and if the suction pressure is smaller than the first pressure threshold value and the rotating speed of the compressor is in the preset high rotating speed interval, reducing the rotating speed of the compressor until the suction pressure is higher than the first pressure threshold value. Based on the thermal management system of the engineering vehicle, the suction pressure of the compressor can be adjusted according to the rotating speed of the compressor and the opening value of the expansion valve, so that the compressor can be in a normal working state, and the situation that effective refrigeration cannot be achieved due to too low suction pressure is reduced.

Description

Technical Field

[0001] This application relates to the field of engineering vehicles, specifically to a method, equipment, and medium for regulating the thermal management system of engineering vehicles. Background Technology

[0002] In the design of modern engineering vehicles, an effective thermal management system is crucial for driver comfort and stable equipment operation.

[0003] Currently, the thermal management system of engineering vehicles can achieve synchronous regulation of the cab temperature by adjusting the opening of the expansion valve and the speed of the compressor. However, existing regulation strategies usually rely on simple on / off control or regulation methods based on fixed time periods. If the expansion valve is not properly adjusted, it can easily lead to low compressor suction pressure, ineffective cooling, or insufficient cooling flow, resulting in poor cooling performance. Summary of the Invention

[0004] To address the aforementioned issues, this application proposes a method for regulating the thermal management system of an engineering vehicle. This method is applied to a thermal management regulation system installed on the engineering vehicle. The thermal management regulation system includes a compressor, a condenser, and an evaporator branch. The evaporator branch includes an evaporator and a first expansion valve. The evaporator is used to cool the cab of the engineering vehicle.

[0005] The method includes:

[0006] The compressor is started, and the corresponding suction pressure of the compressor is collected;

[0007] If the suction pressure is less than the first pressure threshold and the compressor speed is lower than the preset high speed range, then increase the opening value of the first expansion valve until the suction pressure is higher than the first pressure threshold.

[0008] If the opening value of the first expansion valve is adjusted to the highest level and the suction pressure is still not higher than the first pressure threshold, then the compressor speed is reduced until the suction pressure is higher than the first pressure threshold.

[0009] If the suction pressure is less than the first pressure threshold and the compressor speed is in the preset high speed range, then reduce the compressor speed until the suction pressure is higher than the first pressure threshold.

[0010] If the compressor speed is adjusted to the minimum value of the high speed range and the suction pressure is still not higher than the first pressure threshold, then the opening value of the first expansion valve is increased until the suction pressure is higher than the first pressure threshold.

[0011] On the other hand, this application also proposes a thermal management system regulating device for engineering vehicles, comprising:

[0012] At least one processor; and,

[0013] A memory communicatively connected to the at least one processor; wherein,

[0014] The memory stores instructions that can be executed by the at least one processor, which enables the at least one processor to perform, for example, the engineering vehicle thermal management system adjustment method described above.

[0015] On the other hand, this application also proposes a non-volatile computer storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured as: the engineering vehicle thermal management system adjustment method described in the above example.

[0016] The method for adjusting the thermal management system of engineering vehicles proposed in this application can bring the following beneficial effects:

[0017] Based on the thermal management system of engineering vehicles, the compressor suction pressure can be adjusted by controlling the compressor speed and the opening value of the expansion valve, so that the compressor can be in a normal working state and reduce the occurrence of ineffective cooling due to excessively low suction pressure.

[0018] Furthermore, by prioritizing the adjustment of compressor speed and expansion valve opening based on the current operating status of the compressor, positive adjustment of suction pressure can be achieved while minimizing the impact on the compressor's operating status. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0020] Figure 1 This is a flowchart illustrating the adjustment method of the thermal management system for engineering vehicles in an embodiment of this application.

[0021] Figure 2 This is a schematic diagram of the architecture of the thermal management regulation system in the embodiments of this application;

[0022] Figure 3 This is a schematic diagram of the regulating device of the thermal management system for engineering vehicles in this application embodiment. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 As shown in the figure, this application provides a method for adjusting the thermal management system of an engineering vehicle, which is applied in a thermal management adjustment system.

[0026] Thermal management systems are installed on engineering vehicles, which typically refer to specialized vehicles and machinery used for construction, infrastructure development, and other heavy engineering projects. These vehicles may include excavators, bulldozers, cranes, road rollers, etc. The thermal management systems are usually installed on the side or at the corresponding location of the main body of the engineering vehicle.

[0027] like Figure 2 As shown, the thermal management and control system includes a compressor, a condenser, and an evaporator branch. The evaporator branch includes an evaporator and a first expansion valve. The evaporator is used to cool the cab of the engineering vehicle and can be installed inside the cab.

[0028] like Figure 1 As shown, the method includes:

[0029] S101: Determine that the compressor has started and collect the corresponding suction pressure of the compressor.

[0030] The compressor can start automatically, for example, by automatically starting the compressor to begin cooling when a relatively high temperature is detected. Alternatively, the user can manually turn on the compressor to make it work.

[0031] The suction pressure can be detected by a pressure sensor located on the compressor, or by a built-in detection device on the compressor, and the data can be obtained through the corresponding interface.

[0032] S102: If the suction pressure is less than the first pressure threshold and the compressor speed is lower than the preset high speed range, then increase the opening value of the first expansion valve until the suction pressure is higher than the first pressure threshold.

[0033] A first pressure threshold is preset. If the suction pressure is lower than the first pressure threshold, it is considered that the suction pressure is too low, which may cause problems such as vacuuming and make it difficult to achieve effective cooling. The first pressure threshold can be set based on the actual situation of each compressor.

[0034] At this point, the compressor speed is obtained through sensors installed inside the compressor, or through the compressor's built-in detection equipment. A corresponding high-speed range is preset; when the compressor speed exceeds the preset value, it is considered to be in the high-speed range. When the compressor speed is below the high-speed range, i.e., in the low-speed range, the adjustable range for the compressor speed is smaller. In this case, if you want to adjust the suction pressure, you should first adjust the opening value of the first expansion valve.

[0035] Normally, the opening degree of the expansion valve is positively correlated with the suction pressure; the higher the opening degree, the higher the suction pressure. Therefore, the opening degree of the first expansion valve can be increased to raise the suction pressure until it exceeds the first pressure threshold, reaching the normal pressure value. Of course, once it exceeds the first pressure threshold, the opening degree of the first expansion valve can be further increased based on actual needs to further adjust the suction pressure to its optimal value.

[0036] S103: If the opening value of the first expansion valve is adjusted to the highest level and the suction pressure is still not higher than the first pressure threshold, then the compressor speed is reduced until the suction pressure is higher than the first pressure threshold.

[0037] Of course, if the suction pressure is still not higher than the first pressure threshold after adjusting the opening value of the first expansion valve to the maximum (this maximum value can be the theoretical maximum value of the first expansion valve or the maximum allowable value after manual setting), then the opening value of the first expansion valve can no longer be adjusted. Therefore, the suction pressure is adjusted by reducing the compressor speed.

[0038] Generally speaking, compressor speed and suction pressure are negatively correlated; the lower the compressor speed, the higher the suction pressure. Therefore, by reducing the compressor speed, the suction pressure can be adjusted and increased until it exceeds a first pressure threshold. Similarly, after reaching the first pressure threshold, the compressor speed can be further reduced based on actual needs to further adjust the suction pressure to its optimal value.

[0039] S104: If the suction pressure is less than the first pressure threshold and the compressor speed is in the preset high speed range, then reduce the compressor speed until the suction pressure is higher than the first pressure threshold.

[0040] When the suction pressure is low, if the compressor speed is in the high-speed range, it is assumed that there is some room for adjustment in the compressor speed. Therefore, the compressor speed is adjusted first to increase the suction pressure above the first pressure threshold by reducing the compressor speed. Similarly, after reaching the first pressure threshold, the compressor speed can be further reduced based on actual needs to further adjust the suction pressure to the optimal value.

[0041] S105: If the compressor speed is adjusted to the minimum value of the high speed range and the suction pressure is still not higher than the first pressure threshold, then the opening value of the first expansion valve is increased until the suction pressure is higher than the first pressure threshold.

[0042] Of course, when reducing the compressor speed to increase the suction pressure, since the compressor speed is currently in the high speed range, it is considered that the required cooling efficiency is high. Therefore, it is not recommended to reduce the compressor speed to an excessively low level. Thus, the minimum value of the high speed range is used as the lower limit of this adjustment.

[0043] If the compressor speed is adjusted to the minimum value in the high-speed range, but the suction pressure still does not exceed the first pressure threshold, the suction pressure is adjusted to reach the first pressure threshold by increasing the opening value of the first expansion valve. Of course, once the pressure exceeds the first pressure threshold, the opening value of the first expansion valve can be further increased based on actual needs to further adjust the suction pressure to the optimal value.

[0044] Based on the thermal management system of engineering vehicles, the compressor suction pressure can be adjusted by controlling the compressor speed and the opening value of the expansion valve, so that the compressor can be in a normal working state and reduce the occurrence of ineffective cooling due to excessively low suction pressure.

[0045] Furthermore, by prioritizing the adjustment of compressor speed and expansion valve opening based on the current operating status of the compressor, positive adjustment of suction pressure can be achieved while minimizing the impact on the compressor's operating status.

[0046] In one embodiment, such as Figure 2 As shown, the thermal management control system also includes a plate heat exchanger branch, which includes a plate heat exchanger and a second electronic expansion valve. The plate heat exchanger is used to cool the battery pack of the engineering vehicle. For example, as... Figure 2As shown, a water pump is installed in the battery pack cooling system. The water pump supplies coolant at room temperature. When the coolant passes through the battery pack, it exchanges heat with the battery pack, thereby dissipating heat. After heat exchange, the coolant is cooled by air cooling through a low-temperature radiator fan and / or by heat exchange through a plate heat exchanger. The cooled coolant then flows back to the water pump and is reused to cool the battery pack. At this point, both the plate heat exchanger branch and the evaporator branch have cooling requirements.

[0047] Based on this, in the first case, that is, if the intake pressure is less than the first pressure threshold and the compressor speed is lower than the preset high speed range, the intake pressure is no longer increased by simply increasing the opening value of the first expansion valve. Instead, the current ambient temperature of the engineering vehicle is collected, and the optimal battery temperature corresponding to the current ambient temperature is determined based on the pre-generated first mapping table.

[0048] The first mapping table contains the optimal battery temperature for various ambient temperatures. This optimal battery temperature is pre-calibrated, taking into account both battery lifespan and energy consumption. Maintaining the battery within its healthiest temperature range is beneficial for battery life; however, the thermal management costs of maintaining this healthy temperature range vary under different ambient temperatures. Generally, when the current ambient temperature is within a normal range, the optimal battery temperature is also within a normal range, and the two show a relatively weak negative correlation. However, if the current ambient temperature is particularly high or low, to ensure the battery remains relatively within its healthy temperature range, a relatively significant negative correlation will appear, and the optimal battery temperature will be relatively lower or higher.

[0049] At this time, the first temperature difference between the current cab temperature and the set cab temperature (that is, the target cab temperature set by the user or the automatic control system) is obtained, as well as the second temperature difference between the current battery temperature and the optimal battery temperature of the battery pack.

[0050] Based on the first and second differences, determine the required increase in opening value for the first and second expansion valves, respectively. For example, when increasing the intake pressure by increasing the opening value, assuming the ratio between the first and second differences is 2:1 each time, and assuming the unit opening value to be adjusted is A each time, then the opening value of the first expansion valve is adjusted by 2 / 3A each time, and the opening value of the second expansion valve is adjusted by 1 / 3A each time. After one unit opening value adjustment, observe the intake pressure. If the intake pressure still does not meet the requirements, further adjust the opening values ​​of the first and second expansion valves according to the unit opening value.

[0051] In the second case, that is, if the compressor speed is adjusted to the minimum value of the high speed range and the suction pressure is still not higher than the first pressure threshold, similarly, instead of just increasing the opening value of the first expansion valve, the current ambient temperature of the engineering vehicle is collected.

[0052] Based on the pre-generated first mapping table, the optimal battery temperature corresponding to the current ambient temperature is determined, and based on the pre-generated second mapping table, the optimal driving temperature corresponding to the current cab temperature is determined.

[0053] Similar to the first mapping table, the optimal driving temperature table is also pre-calibrated. However, it is primarily based on human comfort. The power cost of controlling the cab to achieve optimal comfort varies depending on the ambient temperature. The optimal cab temperature for optimal driving is pre-calibrated based on a trade-off between achieving optimal driver comfort and minimizing power consumption for cab temperature control. At this point, the temperature closest to the current cab temperature is selected from the set cab temperature and the optimal cab temperature and designated as the specified cab temperature.

[0054] At this point, since the compressor speed is in the high-speed range, it is assumed that the required cooling efficiency of the engineering vehicle is high, and the importance of cooling the battery pack is higher than that of cooling the cab. Therefore, the set cab temperature is no longer used as the reference value. Instead, the specified cab temperature, which is closer to the current cab temperature, is selected as the reference value between the set cab temperature and the optimal cab temperature. At this point, the required cooling efficiency is relatively low, so more cooling efficiency can be used to cool the battery pack.

[0055] Obtain the first temperature difference between the current cab temperature and the specified cab temperature, and the second temperature difference between the current battery temperature and the optimal battery temperature. Based on the first and second differences, determine the required increase in opening value for the first and second expansion valves, respectively. This process is similar to the process in the first case described above, and will not be repeated here.

[0056] In one embodiment, when increasing the suction pressure by adjusting the opening values ​​of the first expansion valve and the second expansion valve, the suction pressure may become too high, exceeding the second pressure threshold. When the suction pressure is too high, it is also not conducive to the operation of the compressor. At this time, the increased opening values ​​of the first expansion valve and the second expansion valve are adjusted back until the suction pressure is within the preset pressure range between the first pressure threshold and the second pressure threshold.

[0057] Similarly, when increasing the suction pressure by reducing the compressor speed, if the suction pressure is higher than the second pressure threshold, the reduced compressor speed is reversed until the suction pressure is within the preset pressure range formed by the first pressure threshold and the second pressure.

[0058] Furthermore, when adjusting the first and second expansion valves, the degree of influence of each valve on the intake pressure can be obtained. This degree of influence refers to the impact on the intake pressure when adjusting the first or second expansion valve alone, while keeping other conditions constant.

[0059] At this point, the increased opening values ​​of the first and second expansion valves can be adjusted back based on the degree of impact. For example, assuming the ratio of the degree of impact of the first and second expansion valves is 2:1, meaning that adjusting the opening value of the first expansion valve by 1 unit has the same impact on the suction pressure as adjusting the opening value of the second expansion valve by 2 units, the adjustment degree of each expansion valve can be determined based on this degree of impact to prevent excessive adjustment at one time, which could lead to an excessively low suction pressure.

[0060] In one embodiment, when adjusting the opening value of the expansion valve or the compressor speed, if it is determined that the suction pressure has been in the preset pressure range for a longer than a preset time, it is considered that the current suction pressure is in a normal state and there is no significant fluctuation. At this time, the current compressor speed is determined.

[0061] The current battery temperature corresponding to the battery pack is obtained. Based on the pre-generated third mapping table, the optimal compressor speed corresponding to the current battery temperature is determined. Since the compressor speed is an important parameter that determines the cooling efficiency, and the cooling efficiency determines whether the battery temperature can be kept stable, similar to the first mapping table, the temperature of each battery is determined in advance based on experiments. At what compressor speed can the temperature of that battery be basically kept stable, and the corresponding third mapping table is generated.

[0062] If the third difference between the current compressor speed and the optimal compressor speed is less than the preset difference, it is considered that the current compressor speed is basically in line with expectations and can maintain the current battery temperature stable. Therefore, the current compressor speed is maintained unchanged.

[0063] If the third difference is greater than the preset difference, it is considered that the current compressor speed is insufficient to maintain a stable battery temperature. In this case, the current compressor speed is gradually adjusted towards the optimal compressor speed. During the adjustment process, a slow adjustment method is adopted, that is, the adjustment speed within a unit time should be lower than a certain value, and the adjustment is carried out while keeping the suction pressure fluctuation as small as possible. Of course, the opening values ​​of the first expansion valve and the second expansion valve can also be adjusted simultaneously and slowly to ensure the normal suction pressure.

[0064] Furthermore, such as Figure 2As shown, a low-temperature radiator is also installed in the plate heat exchanger branch, which is used to dissipate heat from the coolant in the battery pack.

[0065] During the process of gradually adjusting the current compressor speed towards the optimal compressor speed, the frequency of sudden drops in suction pressure per unit time is measured. The unit time is set based on actual conditions, for example, within a range of 1 to 5 minutes. A sudden drop refers to a decrease exceeding a certain value within a very short time (usually within 1 second), followed by a return to normal within a very short time. This sudden drop is usually caused by an anomaly during compressor adjustment. Therefore, if the frequency exceeds a preset frequency threshold, the adjustment of the current compressor speed is stopped. Instead of improving the cooling capacity of the battery pack by adjusting the compressor speed, the cooling fan of the low-temperature radiator is increased to enhance the cooling capacity of the battery pack through other means.

[0066] like Figure 3 As shown in the illustration, this application also provides a thermal management system regulating device for engineering vehicles, comprising:

[0067] At least one processor; and,

[0068] A memory communicatively connected to the at least one processor; wherein,

[0069] The memory stores instructions that can be executed by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform, for example, the engineering vehicle thermal management system adjustment method described in any of the above embodiments.

[0070] This application also provides a non-volatile computer storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured as: the engineering vehicle thermal management system adjustment method described in any of the above embodiments.

[0071] The various embodiments in this application are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device and medium embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the description of the method embodiments.

[0072] The devices and media provided in this application are one-to-one with the methods. Therefore, the devices and media also have similar beneficial technical effects as their corresponding methods. Since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the devices and media will not be repeated here.

[0073] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0074] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0075] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0076] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0077] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0078] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0079] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0080] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0081] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A method for adjusting the thermal management system of an engineering vehicle, characterized in that, The system is used in a thermal management and control system installed on an engineering vehicle. The thermal management and control system includes a compressor, a condenser, and an evaporator branch. The evaporator branch includes an evaporator and a first expansion valve. The evaporator is used to cool the cab of the engineering vehicle. The method includes: The compressor is started, and the corresponding suction pressure of the compressor is collected; If the suction pressure is less than the first pressure threshold and the compressor speed is lower than the preset high speed range, then increase the opening value of the first expansion valve until the suction pressure is higher than the first pressure threshold. If the opening value of the first expansion valve is adjusted to the highest level and the suction pressure is still not higher than the first pressure threshold, then the compressor speed is reduced until the suction pressure is higher than the first pressure threshold. If the suction pressure is less than the first pressure threshold and the compressor speed is in the preset high speed range, then the compressor speed is reduced until the suction pressure is higher than the first pressure threshold. If the compressor speed is adjusted to the minimum value of the high speed range and the suction pressure is still not higher than the first pressure threshold, then the opening value of the first expansion valve is increased until the suction pressure is higher than the first pressure threshold.

2. The method according to claim 1, characterized in that, The thermal management and regulation system also includes a plate heat exchanger branch, which includes a plate heat exchanger and a second expansion valve. The plate heat exchanger is used to cool the battery pack of the engineering vehicle.

3. The method according to claim 2, characterized in that, If the suction pressure is less than the first pressure threshold and the compressor speed is lower than the preset high speed range, then the opening value of the first expansion valve is increased, specifically including: If the intake pressure is less than the first pressure threshold and the compressor speed is lower than the preset high speed range, then the current ambient temperature of the engineering vehicle is collected. Based on the pre-generated first mapping table, the optimal battery temperature corresponding to the current ambient temperature is determined; Obtain a first temperature difference between the current cab temperature and the set cab temperature, and a second temperature difference between the current battery temperature and the optimal battery temperature of the battery pack. Based on the first difference and the second difference, determine the required increase in opening value for the first expansion valve and the second expansion valve, respectively.

4. The method according to claim 2, characterized in that, If the compressor speed is adjusted to the minimum value of the high-speed range, and the suction pressure still does not exceed the first pressure threshold, then the opening value of the first expansion valve is increased, specifically including: If the compressor speed is adjusted to the minimum value of the high speed range and the suction pressure is still not higher than the first pressure threshold, then the current ambient temperature of the engineering vehicle is collected. Based on the pre-generated first mapping table, the optimal battery temperature corresponding to the current ambient temperature is determined. Based on the pre-generated second mapping table, the optimal driving temperature corresponding to the current ambient temperature is determined. The temperature that is closer to the current driving temperature is selected from the set driving temperature and the optimal driving temperature and used as the specified driving temperature. Obtain a first temperature difference between the current cab temperature and the specified cab temperature, and a second temperature difference between the current battery temperature and the optimal battery temperature of the battery pack; Based on the first difference and the second difference, determine the required increase in opening value for the first expansion valve and the second expansion valve, respectively.

5. The method according to claim 2, characterized in that, After determining the required increase in opening value for the first expansion valve and the second expansion valve based on the first difference and the second difference, the method further includes: If the inhalation pressure is higher than the second pressure threshold, the increased opening values ​​of the first expansion valve and the second expansion valve are adjusted back until the inhalation pressure is within the preset pressure range between the first pressure threshold and the second pressure threshold. After reducing the compressor speed until the suction pressure is higher than the first pressure threshold, the method further includes: If the suction pressure is higher than the second pressure threshold, the reduced compressor speed is reversed until the suction pressure is within a preset pressure range formed by the first pressure threshold and the second pressure.

6. The method according to claim 5, characterized in that, The increased opening values ​​of the first and second expansion valves are reverted, specifically including: The degree of influence of the first expansion valve and the second expansion valve on the intake pressure is obtained, and the increased opening value of the first expansion valve and the second expansion valve is adjusted back according to the degree of influence.

7. The method according to claim 5, characterized in that, The method further includes: The system determines that the duration during which the intake pressure remains within the preset pressure range exceeds a preset duration, and then determines the current compressor speed. Obtain the current battery temperature corresponding to the battery pack, and determine the optimal compressor speed corresponding to the current battery temperature based on the pre-generated third mapping table; If the third difference between the current compressor speed and the optimal compressor speed is less than a preset difference, then the current compressor speed is kept unchanged. If the third difference is greater than the preset difference, then the current compressor speed is gradually adjusted towards the optimal compressor speed.

8. The method according to claim 7, characterized in that, The plate heat exchanger branch is also equipped with a low-temperature radiator, and the method further includes: During the process of gradually adjusting the current compressor speed towards the optimal compressor speed, the frequency of sudden drops in suction pressure per unit time is obtained; If the frequency is higher than the preset frequency threshold, the adjustment of the current compressor speed will be stopped, and the airflow of the cooling fan of the low-temperature radiator will be increased.

9. A regulating device for a thermal management system of an engineering vehicle, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform, for example, the engineering vehicle thermal management system adjustment method as described in any one of claims 1 to 8.

10. A non-volatile computer storage medium storing computer-executable instructions, characterized in that, The computer-executable instructions are configured as follows: the engineering vehicle thermal management system adjustment method according to any one of claims 1 to 8.

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