A commercial vehicle air conditioning system pressure protection method, device, equipment and medium

Abstract

The application discloses a commercial vehicle air conditioning system pressure protection method, device, equipment and medium, and the method comprises the following steps: based on a preset air conditioning pressure protection logic, controlling the air conditioner to enter or exit an air conditioner protection state; wherein, the air conditioner protection state comprises a high-pressure protection state, a low-pressure protection state and a medium-pressure protection state; the method can replace the current commercial vehicle air conditioning system pressure protection scheme which relies on experience values and has no air conditioning system and refrigerant parameter correction, and through setting the phase change temperature of the refrigerant, the corresponding phase change pressure of the refrigerant is calculated, so that the pressure parameters of the air conditioning system pressure protection are determined, the accuracy and reliability of the air conditioning system pressure protection logic are improved, and the demand of the commercial vehicle air conditioning system pressure protection using different components and refrigerants can also be met.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle air-conditioning pressure protection, and in particular to a method, device, equipment and medium for pressure protection of a commercial vehicle air-conditioning system. Background Art

[0002] The control logic of commercial vehicle air conditioning systems not only affects rider comfort but also vehicle energy consumption. Furthermore, beyond comfort and energy consumption, the control logic of the air conditioning system also ensures system reliability and is a crucial component of vehicle design. Currently, the pressure protection logic of traditional commercial vehicle air conditioning systems is still primarily based on empirical values ​​suitable for traditional refrigerants, making it inflexible to accommodate new refrigerants and new system components.

[0003] However, to control greenhouse gas emissions, many commonly used air conditioning refrigerants are on the verge of being phased out. The physical properties of newer refrigerants differ significantly from those of traditional refrigerants, making empirical values ​​for these refrigerants inappropriate. Furthermore, these newer refrigerants pose flammability or high pressure issues, necessitating significant changes to the air conditioning system architecture. This further distorts empirical values ​​based on traditional refrigerants and conventional commercial vehicle air conditioning systems. Therefore, a pressure protection logic for commercial vehicle air conditioning systems is urgently needed to meet the needs of different refrigerants and air conditioning system architectures. Summary of the Invention

[0004] The present application provides a commercial vehicle air conditioning system pressure protection method, device, equipment and medium to solve the above problems.

[0005] In one aspect, the present application provides a method for protecting the pressure of a commercial vehicle air conditioning system. The method includes: controlling the air conditioner to enter or exit an air conditioning protection state based on a preset air conditioning pressure protection logic; wherein the air conditioning protection state includes a high pressure protection state, a low pressure protection state, and a medium pressure protection state; the air conditioning pressure protection logic is specifically:

[0006] When the high pressure of the refrigerant inside the air conditioner exceeds the first pressure threshold that the air conditioning system components can withstand, the air conditioner enters the high-pressure protection state. When the high pressure of the refrigerant inside the air conditioner is within the range that can ensure heat dissipation when the original vehicle cooling fan is fully engaged, the air conditioner exits the high-pressure protection state.

[0007] When the low pressure of the refrigerant inside the air conditioner is lower than the second pressure threshold of the air conditioner system's icing protection, the air conditioner enters the low pressure protection state; when the low pressure of the refrigerant inside the air conditioner is higher than the second pressure threshold of the air conditioner system's icing protection, the air conditioner exits the low pressure protection state;

[0008] When the high pressure of the refrigerant inside the air conditioner is higher than the third pressure threshold for stable operation of the air conditioning system, but is still within the range where the original vehicle's cooling fan is fully engaged to ensure heat dissipation, the air conditioner enters the medium pressure protection state; when the high pressure of the refrigerant inside the air conditioner reaches the fourth pressure threshold for the air conditioning system charge calibration test, the air conditioner exits the medium pressure protection state.

[0009] In one implementation of the present application, the method further includes:

[0010] Set the air conditioning medium pressure protection exit pressure P0, air conditioning medium pressure protection pressure P1, air conditioning high pressure protection exit pressure P2, air conditioning high pressure protection pressure P3, air conditioning low pressure protection exit pressure P4, and air conditioning low pressure protection pressure P5, air conditioning system high pressure P h ;

[0011] When P1<P h <P2, the air conditioner enters the medium pressure protection state; when P h When P<P0, the air conditioner exits the medium pressure protection state; when P h >P3, the air conditioner enters high pressure protection state; when P h <P2, the air conditioner exits the high-voltage protection state; when P l <P5, the air conditioner enters low pressure protection state; when P l >P4, the air conditioner exits the low-pressure protection state.

[0012] In one implementation of the present application, the method further includes:

[0013] When the air conditioner enters the high-voltage protection state, the original car air conditioner will not start; when the air conditioner exits the high-voltage protection state, the original car air conditioner is allowed to start;

[0014] When the air conditioner enters the low-voltage protection state, the original car air conditioner will not start; when the air conditioner exits the low-voltage protection state, the original car air conditioner is allowed to start;

[0015] When the air conditioner enters the medium-pressure protection state, the original vehicle cooling fan is fully engaged; when the air conditioner exits the medium-pressure protection state, the original vehicle cooling fan returns to the state required by the cooling system.

[0016] In one implementation of the present application, the method further includes:

[0017] When P0≤P h ≤P1, the air conditioner maintains the medium pressure protection state;

[0018] When P2≤P h ≤P0, the air conditioner maintains high-voltage protection status;

[0019] When P5≤P l ≤P4, the air conditioner maintains low pressure protection status.

[0020] In one implementation of the present application, for the air conditioning high pressure protection, the value of the pressure protection pressure P3 is determined by the lowest pressure resistance value of each component of the air conditioning system; the value of the air conditioning high pressure protection exit pressure P2 is determined by the refrigerant phase change temperature T2 inside the condenser when the high pressure protection is no longer needed; wherein, the stable operation of the air conditioning condenser refrigerant phase change temperature and the test environment temperature T are defined when the original vehicle cooling fan is fully engaged. t The difference is ΔT2, then T2 is the instantaneous maximum ambient temperature T in the area where the air-conditioning user's car is located. h and ΔT2, that is, T2=T h +ΔT2; P2 is the phase change pressure when the refrigerant temperature of the commercial vehicle air conditioner is actually used at T2 minus the pressure fluctuation value P w .

[0021] In one implementation of the present application, for the air conditioner low pressure protection: the value of the air conditioner low pressure protection pressure P5 is determined by the set temperature T5 of the icing protection; P5 is the phase change pressure when the refrigerant temperature of the commercial vehicle air conditioner is actually used at T5; the low pressure protection exit pressure P4 is determined by the exit temperature T4 of the icing protection, and T4 is the product of T5 and the temperature fluctuation value T w The sum of T4 = T5 + T w ; P4 is the phase change pressure when the refrigerant temperature actually used by the commercial vehicle air conditioner is T4.

[0022] In one implementation of the present application, for the medium pressure protection of the air conditioner: the value of the medium pressure protection pressure P1 is determined by the phase change temperature T1 of the refrigerant inside the condenser when the medium pressure protection is required; the phase change temperature of the refrigerant in the stable operation of the air conditioner condenser when the original vehicle cooling fan is not engaged is defined as the phase change temperature of the refrigerant in the stable operation and the test environment temperature T t The difference is ΔT1, then T1 is T h and ΔT1, that is, T1=T h +ΔT1; P1 is the phase change pressure when the refrigerant temperature of the commercial vehicle air conditioner is T1; the medium pressure protection exit pressure P0 is the high pressure value P of the commercial vehicle air conditioner system in stable operation. n and pressure fluctuation value P w The sum of P0=P n +P w ;P n That is, the high pressure value when the commercial vehicle air conditioner is operating within the standard charging volume range and charging temperature.

[0023] The present application also provides a pressure protection device for a commercial vehicle air conditioning system, the device comprising:

[0024] A control module, configured to control the air conditioner to enter or exit an air conditioner protection state based on a preset air conditioner pressure protection logic; wherein the air conditioner protection state includes a high pressure protection state, a low pressure protection state, and a medium pressure protection state;

[0025] The high-pressure protection module is used to put the air conditioner into a high-pressure protection state when the high pressure of the refrigerant inside the air conditioner exceeds the first pressure threshold that the air conditioning system components can withstand; the air conditioner exits the high-pressure protection state when the high pressure of the refrigerant inside the air conditioner is within the range that can ensure heat dissipation when the original vehicle cooling fan is fully engaged;

[0026] A low-pressure protection module is configured to: cause the air conditioner to enter a low-pressure protection state when the low pressure of the refrigerant inside the air conditioner is lower than a second pressure threshold for freezing protection of the air conditioner system; and to exit the low-pressure protection state when the low pressure of the refrigerant inside the air conditioner is higher than the second pressure threshold for freezing protection of the air conditioner system;

[0027] The medium-pressure protection module is used to put the air conditioner into the medium-pressure protection state when the high pressure of the refrigerant inside the air conditioner is higher than the third pressure threshold for stable operation of the air-conditioning system, but is still within the range where the original vehicle cooling fan is fully engaged to ensure heat dissipation; when the high pressure of the refrigerant inside the air conditioner reaches the fourth pressure threshold of the air-conditioning system charge calibration test, the air conditioner exits the medium-pressure protection state.

[0028] The present application also provides a pressure protection device for a commercial vehicle air conditioning system, the device comprising:

[0029] at least one processor; and,

[0030] a memory communicatively connected to the at least one processor; wherein,

[0031] The memory stores instructions that can be executed by the at least one processor. The instructions are executed by the at least one processor to enable the at least one processor to complete the aforementioned commercial vehicle air conditioning system pressure protection method.

[0032] The present application also provides a non-volatile computer storage medium for pressure protection of a commercial vehicle air-conditioning system, which stores computer-executable instructions. The computer-executable instructions are executed by a processor to implement the aforementioned commercial vehicle air-conditioning system pressure protection method.

[0033] The present application provides a commercial vehicle air-conditioning system pressure protection method, system, equipment and medium, which can replace the current commercial vehicle air-conditioning system pressure protection scheme that relies on empirical values ​​and does not correct the air-conditioning system and its refrigerant parameters. At the main operating points of high-pressure protection, medium-pressure protection, low-pressure protection and exit protection of the air-conditioning system, by setting the allowable phase change temperature of the refrigerant and calculating the corresponding phase change pressure of the refrigerant, the various pressure parameters of the air-conditioning system pressure protection are determined, thereby improving the accuracy and reliability of the air-conditioning system pressure protection logic, and meeting the pressure protection needs of commercial vehicle air-conditioning systems using different components and refrigerants. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0035] Figure 1 A flow chart of a pressure protection method for a commercial vehicle air-conditioning system provided in an embodiment of the present application;

[0036] Figure 2 A diagram showing the composition of a pressure protection device for a commercial vehicle air conditioning system provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of a pressure protection device for a commercial vehicle air conditioning system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0039] The embodiments of the present application provide a method, device, equipment, and medium for pressure protection of a commercial vehicle air-conditioning system. The technical solutions proposed in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0040] Example 1

[0041] Figure 1 The present invention provides a method for protecting the pressure of a commercial vehicle air conditioning system. Figure 1As shown, the method mainly includes the following steps: based on the preset air conditioning pressure protection logic, controlling the air conditioner to enter or exit the air conditioning protection state; wherein the air conditioning protection state includes a high pressure protection state, a low pressure protection state and a medium pressure protection state; the air conditioning pressure protection logic is specifically:

[0042] When the high pressure of the refrigerant inside the air conditioner exceeds the first pressure threshold that the air conditioning system components can withstand, the air conditioner enters the high-pressure protection state. When the high pressure of the refrigerant inside the air conditioner is within the range that can ensure heat dissipation when the original vehicle cooling fan is fully engaged, the air conditioner exits the high-pressure protection state.

[0043] When the low pressure of the refrigerant inside the air conditioner is lower than the second pressure threshold of the air conditioner system's icing protection, the air conditioner enters the low pressure protection state; when the low pressure of the refrigerant inside the air conditioner is higher than the second pressure threshold of the air conditioner system's icing protection, the air conditioner exits the low pressure protection state;

[0044] When the high pressure of the refrigerant inside the air conditioner is higher than the third pressure threshold for stable operation of the air conditioning system, but is still within the range where the original vehicle's cooling fan is fully engaged to ensure heat dissipation, the air conditioner enters the medium pressure protection state; when the high pressure of the refrigerant inside the air conditioner reaches the fourth pressure threshold for the air conditioning system charge calibration test, the air conditioner exits the medium pressure protection state.

[0045] This application sets the air conditioning medium pressure protection exit pressure P0, the air conditioning medium pressure protection pressure P1, the air conditioning high pressure protection exit pressure P2, the air conditioning high pressure protection pressure P3, the air conditioning low pressure protection exit pressure P4, and the air conditioning low pressure protection pressure P5.

[0046] When the high pressure Ph of the air conditioning system is between P1 and P2, that is, P1<Ph<P2, the air conditioning enters the medium pressure protection state.

[0047] When the system high pressure Ph is between the air conditioner medium pressure protection pressure P1 and the medium pressure protection exit pressure P0, that is, P0≤Ph≤P1, the air conditioner maintains the previous state.

[0048] When the high pressure Ph of the air conditioning system is less than P0, the air conditioner exits the medium pressure protection state.

[0049] When the high pressure Ph of the air conditioning system is higher than the high pressure protection pressure, that is, Ph>P3, the air conditioner enters the high pressure protection state.

[0050] When the system high pressure Ph is between the air conditioner high pressure protection pressure P3 and the high pressure protection exit pressure P2, that is, P2≤Ph≤P0, the air conditioner maintains the previous state.

[0051] When the high pressure Ph of the air conditioning system is lower than the high pressure protection exit pressure, that is, Ph<P2, the air conditioning exits the high pressure protection state.

[0052] When the low pressure Pl of the air conditioning system is lower than the low pressure protection pressure, that is, Pl<P5, the air conditioner enters the low pressure protection state.

[0053] When the system low pressure Pl is between the air conditioner low pressure protection pressure P5 and the low pressure protection exit pressure P4, that is, P5≤Pl≤P4, the air conditioner maintains the previous state.

[0054] When the low pressure Pl of the air conditioning system is higher than the low pressure protection exit pressure, that is, Pl>P4, the air conditioning exits the low pressure protection state.

[0055] The empirical values ​​and empirical formulas of the above protection pressure values ​​are as follows:

[0056] The value of the high-pressure protection pressure P3 is determined by the lowest pressure resistance value of each component of the air-conditioning system.

[0057] The value of the high-pressure protection exit pressure P2 is determined by the refrigerant phase change temperature T2 inside the condenser when high-pressure protection is no longer required.

[0058] When the original vehicle's cooling fan is fully engaged, the difference between the refrigerant phase change temperature of the stably operating air-conditioning condenser and the test ambient temperature Tt is defined as ΔT2. Then T2 is the sum of the instantaneous maximum ambient temperature Th and ΔT2 in the area where the air-conditioning user's car is located, that is, T2 = Th + ΔT2.

[0059] P2 is the phase change pressure when the refrigerant temperature actually used by the commercial vehicle air conditioner is T2 minus the pressure fluctuation value Pw.

[0060] The value of the low pressure protection pressure P5 is determined by the set temperature T5 of the ice protection.

[0061] P5 is the phase change pressure when the refrigerant temperature actually used by the commercial vehicle air conditioner is T5.

[0062] The low-pressure protection exit pressure P4 is determined by the exit temperature T4 of the icing protection. T4 is the sum of T5 and the temperature fluctuation value Tw, that is, T4=T5+Tw.

[0063] P4 is the phase change pressure when the refrigerant temperature actually used by the commercial vehicle air conditioner is T4.

[0064] The value of the medium pressure protection pressure P1 is determined by the refrigerant phase change temperature T1 inside the condenser when medium pressure protection is required.

[0065] The difference between the refrigerant phase change temperature of the stably operating air-conditioning condenser and the test ambient temperature Tt when the original vehicle cooling fan is not engaged is defined as ΔT1. Then T1 is the sum of Th and ΔT1, that is, T1 = Th + ΔT1.

[0066] P1 is the phase change pressure when the refrigerant temperature actually used by the commercial vehicle air conditioner is T1.

[0067] The medium pressure protection exit pressure P0 is the sum of the stable operation high pressure value Pn and the pressure fluctuation value Pw of the commercial vehicle air-conditioning system, that is, P0 = Pn + Pw.

[0068] Pn is the high pressure value when the commercial vehicle air conditioner is operating within the standard charging volume range and charging temperature.

[0069] like Figure 1 As shown, this embodiment provides a low-voltage protection logic for commercial vehicles, including the following steps:

[0070] Determine whether commercial vehicles require low voltage protection;

[0071] After the air conditioner is turned on, if the low pressure Pl of the air conditioning system is not lower than the low pressure protection pressure P5, that is, Pl ≥ P5, the air conditioning system does not need low pressure protection, and the subsequent high pressure protection and medium pressure protection judgments are carried out;

[0072] If the air conditioning system low pressure Pl is lower than the low pressure protection pressure P5, that is, Pl<P5, the air conditioner enters the low pressure protection state and the air conditioner compressor does not start;

[0073] Furthermore, if the low pressure of the air conditioning system is still not higher than the low pressure protection exit pressure P4, that is, when Pl ≤ P4, the air conditioning system continues to be in the low pressure protection state and the air conditioning compressor does not start;

[0074] Furthermore, if the low pressure of the air-conditioning system is higher than the low pressure protection exit pressure P4, that is, Pl>P4, the air-conditioning system exits the low pressure protection state and performs subsequent high pressure protection and medium pressure protection judgments.

[0075] Example 2

[0076] like Figure 1 As shown, this embodiment provides a commercial vehicle high-voltage protection logic, including the following steps:

[0077] After the air conditioner is turned on, if the air conditioner system does not require low-pressure protection, the high-pressure protection judgment is performed. If the high-pressure Ph is not higher than the high-pressure protection pressure P3, that is, Ph ≤ P3, the air conditioner does not require high-pressure protection, the air conditioner compressor is started, and the subsequent medium-pressure protection judgment is performed;

[0078] If the high pressure Ph of the air conditioning system is higher than the high pressure protection pressure P3, that is, Ph>P3, the air conditioning enters the high pressure protection state and the air conditioning compressor does not start;

[0079] Furthermore, if the high pressure of the air conditioning system is still not lower than the high pressure protection exit pressure P2, that is, when Ph≥P2, the air conditioning continues to be in the high pressure protection state and the air conditioning compressor does not start;

[0080] Furthermore, if the high pressure of the air-conditioning system is lower than the high pressure protection exit pressure P2, that is, Ph<P2, the air-conditioning system exits the high pressure protection state, the air-conditioning compressor starts, and the subsequent medium pressure protection judgment is performed.

[0081] Example 3

[0082] like Figure 1 As shown, this embodiment provides a medium voltage protection logic for commercial vehicles, including the following steps:

[0083] After the air conditioner is turned on, if the air conditioner system does not require low-pressure and high-pressure protection, the medium-pressure protection is judged. If the high-pressure Ph is not higher than the medium-pressure protection pressure P1, that is, Ph ≤ P1, the air conditioner does not need medium-pressure protection, and the original vehicle cooling fan does not need to be fully engaged;

[0084] If the high pressure Ph of the air conditioning system is higher than the medium pressure protection pressure P1, that is, Ph>P1, the air conditioning enters the medium pressure protection state, and the original vehicle cooling fan is fully engaged;

[0085] Furthermore, if the high pressure of the air conditioning system is still not lower than the medium pressure protection exit pressure P0, that is, when Ph≥P0, the air conditioning continues to be in the medium pressure protection state, and the original vehicle cooling fan is fully engaged;

[0086] Furthermore, if the high pressure of the air conditioning system is lower than the medium pressure protection exit pressure P0, that is, Ph<P0, the air conditioning system exits the medium pressure protection state, and the original vehicle cooling fan returns to the state required by the cooling system.

[0087] The above is a commercial vehicle air conditioning system pressure protection method provided by an embodiment of the present application. Based on the same inventive concept, an embodiment of the present application also provides a commercial vehicle air conditioning system pressure protection device. Figure 2 A composition diagram of a pressure protection device for a commercial vehicle air conditioning system provided in an embodiment of the present application is shown in FIG. Figure 2As shown, the device mainly includes: a control module 201, which is used to control the air conditioner to enter or exit the air conditioner protection state based on the preset air conditioner pressure protection logic; wherein, the air conditioner protection state includes a high-pressure protection state, a low-pressure protection state and a medium-pressure protection state; a high-pressure protection module 202, which is used to control the air conditioner to enter the high-pressure protection state when the high pressure of the refrigerant inside the air conditioner is higher than the first pressure threshold tolerated by the air conditioner system components; when the high pressure of the refrigerant inside the air conditioner is within the range that can ensure heat dissipation when the original vehicle cooling fan is fully engaged, the air conditioner exits the high-pressure protection state; a low-pressure protection module 203, which is used to control the air conditioner to enter or exit the high-pressure protection state when the high pressure of the refrigerant inside the air conditioner is higher than the first pressure threshold tolerated by the air conditioner system components; when the high pressure of the refrigerant inside the air conditioner is within the range that can ensure heat dissipation when the original vehicle cooling fan is fully engaged, the air conditioner exits the high-pressure protection state; When the low pressure of the internal refrigerant is lower than the second pressure threshold of the air-conditioning system's ice protection, the air-conditioning enters the low-pressure protection state; when the low pressure of the internal refrigerant of the air-conditioning is higher than the second pressure threshold of the air-conditioning system's ice protection, the air-conditioning exits the low-pressure protection state; the medium-pressure protection module 204 is used to enter the medium-pressure protection state when the high pressure of the internal refrigerant of the air-conditioning is higher than the third pressure threshold of the air-conditioning system's stable operation, but is still within the range where the original vehicle's cooling fan is fully engaged to ensure heat dissipation; when the high pressure of the internal refrigerant of the air-conditioning reaches the fourth pressure threshold of the air-conditioning system's charge calibration test, the air-conditioning exits the medium-pressure protection state.

[0088] The above is a commercial vehicle air conditioning system pressure protection device provided by the embodiment of the present application. Based on the same inventive concept, the embodiment of the present application also provides a commercial vehicle air conditioning system pressure protection device. Figure 3 A schematic diagram of a pressure protection device for a commercial vehicle air conditioning system provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the device mainly includes: at least one processor 301; and a memory 302 in communication with the at least one processor; wherein the memory 302 stores instructions that can be executed by the at least one processor 301, and the instructions are executed by the at least one processor 301 to enable the at least one processor 301 to complete the aforementioned commercial vehicle air conditioning system pressure protection method.

[0089] In addition, an embodiment of the present application also provides a non-volatile computer storage medium for pressure protection of a commercial vehicle air-conditioning system, which stores computer-executable instructions. The computer-executable instructions are executed by a processor to implement the aforementioned commercial vehicle air-conditioning system pressure protection method.

[0090] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts 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, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0091] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0092] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0093] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0094] The various embodiments in this application are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences from other embodiments. In particular, the device embodiments are generally similar to the method embodiments, so the description is relatively simple. For relevant parts, refer to the partial description of the method embodiments.

[0095] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0096] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A commercial vehicle air conditioning system pressure protection method, characterized in that: The method includes: controlling an air conditioner to enter or exit an air conditioner protection state based on a preset air conditioner pressure protection logic; wherein the air conditioner protection state includes a high pressure protection state, a low pressure protection state, and a medium pressure protection state; the air conditioner pressure protection logic is specifically: When the high pressure of the refrigerant inside the air conditioner exceeds the first pressure threshold that the air conditioning system components can withstand, the air conditioner enters the high-pressure protection state. When the high pressure of the refrigerant inside the air conditioner is within the range that can ensure heat dissipation when the original vehicle cooling fan is fully engaged, the air conditioner exits the high-pressure protection state. When the low pressure of the refrigerant inside the air conditioner is lower than the second pressure threshold of the air conditioner system's icing protection, the air conditioner enters the low pressure protection state; when the low pressure of the refrigerant inside the air conditioner is higher than the second pressure threshold of the air conditioner system's icing protection, the air conditioner exits the low pressure protection state; When the high pressure of the refrigerant inside the air conditioner exceeds the third pressure threshold for stable operation of the air conditioning system, but is still within the range where the original vehicle's cooling fan can fully engage to ensure heat dissipation, the air conditioner enters the medium pressure protection state. When the high pressure of the refrigerant inside the air conditioner reaches the fourth pressure threshold for the air conditioning system charge calibration test, the air conditioner exits the medium pressure protection state. The method further comprises: When the air conditioner enters the high-voltage protection state, the original car air conditioner will not start; when the air conditioner exits the high-voltage protection state, the original car air conditioner is allowed to start; When the air conditioner enters the low-voltage protection state, the original car air conditioner will not start; when the air conditioner exits the low-voltage protection state, the original car air conditioner is allowed to start; When the air conditioner enters the medium-pressure protection state, the original vehicle cooling fan is fully engaged; when the air conditioner exits the medium-pressure protection state, the original vehicle cooling fan returns to the state required by the cooling system.

2. A commercial vehicle air conditioning system pressure protection method according to claim 1, characterized in that: The method further comprises: Set the air conditioning medium pressure protection exit pressure P0, air conditioning medium pressure protection pressure P1, air conditioning high pressure protection exit pressure P2, air conditioning high pressure protection pressure P3, air conditioning low pressure protection exit pressure P4, and air conditioning low pressure protection pressure P5, air conditioning system high pressure P h ; When P1<P h <P2, the air conditioner enters the medium pressure protection state; when P h When P<P0, the air conditioner exits the medium pressure protection state; when P h >P3, the air conditioner enters high pressure protection state; when P h <P2, the air conditioner exits the high-voltage protection state; when P h <P5, the air conditioner enters low pressure protection state; when P h >P4, the air conditioner exits the low-pressure protection state.

3. A commercial vehicle air conditioning system pressure protection method according to claim 2, characterized in that: The method further comprises: When P0≤P h ≤P1, the air conditioner maintains the medium pressure protection state; When P2≤P h ≤P0, the air conditioner maintains high-voltage protection status; When P5≤P h ≤P4, the air conditioner maintains low pressure protection status.

4. A commercial vehicle air conditioning system pressure protection method according to claim 2, characterized in that: For the air conditioning high pressure protection, the value of the pressure protection pressure P3 is determined by the lowest pressure resistance value of each component of the air conditioning system; the value of the air conditioning high pressure protection exit pressure P2 is determined by the refrigerant phase change temperature T2 inside the condenser when the high pressure protection is no longer needed; among them, the stable operation of the air conditioning condenser refrigerant phase change temperature and the test environment temperature T are defined when the original vehicle cooling fan is fully engaged. t The difference is ΔT2, then T2 is the instantaneous maximum ambient temperature T in the area where the air-conditioning user's car is located. h and ΔT2, that is, T2=T h +ΔT2; P2 is the phase change pressure when the refrigerant temperature of the commercial vehicle air conditioner is actually used at T2 minus the pressure fluctuation value P w .

5. A commercial vehicle air conditioning system pressure protection method according to claim 2, characterized in that: For air conditioning low pressure protection: the value of the air conditioning low pressure protection pressure P5 is determined by the set temperature T5 of the icing protection; P5 is the phase change pressure when the refrigerant temperature of the commercial vehicle air conditioner is T5; the low pressure protection exit pressure P4 is determined by the exit temperature T4 of the icing protection, and T4 is the product of T5 and the temperature fluctuation value T w The sum of T4=T5+T w ; P4 is the phase change pressure when the refrigerant temperature actually used by the commercial vehicle air conditioner is T4.

6. A commercial vehicle air conditioning system pressure protection method according to claim 2, characterized in that: For air conditioning medium pressure protection: the value of medium pressure protection pressure P1 is determined by the refrigerant phase change temperature T1 inside the condenser when medium pressure protection is required; define the phase change temperature of the refrigerant in the air conditioning condenser in stable operation when the original vehicle cooling fan is not engaged and the test environment temperature T t The difference is ΔT1, then T1 is T h and ΔT1, that is, T1=T h +ΔT1; P1 is the phase change pressure when the refrigerant temperature of the commercial vehicle air conditioner is T1; the medium pressure protection exit pressure P0 is the high pressure value P of the commercial vehicle air conditioner system in stable operation. n and pressure fluctuation value P w The sum of P0=P n +P w ;P n That is, the high pressure value when the commercial vehicle air conditioner is operating within the standard charging volume range and charging temperature.

7. A pressure protection device for a commercial vehicle air conditioning system, applying a pressure protection method for a commercial vehicle air conditioning system according to any one of claims 1 to 6, characterized in that: The device comprises: A control module, configured to control the air conditioner to enter or exit an air conditioner protection state based on a preset air conditioner pressure protection logic; wherein the air conditioner protection state includes a high pressure protection state, a low pressure protection state, and a medium pressure protection state; The high-pressure protection module is used to put the air conditioner into a high-pressure protection state when the high pressure of the refrigerant inside the air conditioner exceeds the first pressure threshold that the air conditioning system components can withstand; the air conditioner exits the high-pressure protection state when the high pressure of the refrigerant inside the air conditioner is within the range that can ensure heat dissipation when the original vehicle cooling fan is fully engaged; A low-pressure protection module is configured to: cause the air conditioner to enter a low-pressure protection state when the low pressure of the refrigerant inside the air conditioner is lower than a second pressure threshold for freezing protection of the air conditioner system; and to exit the low-pressure protection state when the low pressure of the refrigerant inside the air conditioner is higher than the second pressure threshold for freezing protection of the air conditioner system; The medium-pressure protection module is used to put the air conditioner into the medium-pressure protection state when the high pressure of the refrigerant inside the air conditioner is higher than the third pressure threshold for stable operation of the air-conditioning system, but is still within the range where the original vehicle cooling fan is fully engaged to ensure heat dissipation; when the high pressure of the refrigerant inside the air conditioner reaches the fourth pressure threshold of the air-conditioning system charge calibration test, the air conditioner exits the medium-pressure protection state.

8. A pressure protection device for a commercial vehicle air conditioning system, characterized in that: The device comprises: at least one processor; and, 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, and the instructions are executed by the at least one processor so that the at least one processor can complete the commercial vehicle air-conditioning system pressure protection method according to any one of claims 1 to 6.

9. A non-volatile computer storage medium for pressure protection of a commercial vehicle air conditioning system, storing computer executable instructions, characterized in that: The computer executable instructions are executed by a processor to implement a commercial vehicle air-conditioning system pressure protection method according to any one of claims 1 to 6.

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