A method, device, equipment and storage medium for testing a new energy automobile air conditioner

Abstract

The application relates to the field of automobile thermal management, and particularly provides a method, device and equipment for testing a new energy automobile air conditioner and a storage medium, the method comprising the following steps: adding refrigerant to a charging quantity platform in an alternating mode of single evaporator and double evaporator, and determining optimal charging quantity of the air conditioner according to a drawn single-double-evaporator charging quantity platform curve; under a rated working condition, adjusting the opening degree of an electronic expansion valve to adjust the supercooling degree of a condenser outlet, and determining optimal supercooling degree of the air conditioner according to a drawn air conditioner supercooling degree performance curve; under the conditions of ensuring the optimal charging quantity of the air conditioner and the optimal supercooling degree of the air conditioner, analyzing the air conditioner circulating oil return rate under different modes. The method can achieve the effect of comprehensively testing the new energy automobile air conditioner.

Description

Technical Field

[0001] This application relates to the field of automotive thermal management, and more specifically, to a method, apparatus, device, and storage medium for testing the air conditioning system of a new energy vehicle. Background Technology

[0002] With the rapid development of China's economy and automotive industry, automotive thermal management technology, as a crucial component of the vehicle system, has become a highlight of competition among automakers. The rapid development of new energy vehicles has significantly increased the importance of the vehicle's thermal management system, and thermal management system testing, as a means of assessing its comprehensive performance, plays an irreplaceable and critical role. Currently, new energy vehicle air conditioning systems not only utilize air conditioning heat pump technology but also facilitate heat exchange between the vehicle's cooling system and the battery cooling system. Automotive air conditioning heat pump systems offer significant advantages in energy saving, especially crucial for improving the driving range of electric vehicles (EVs) and hybrid electric vehicles (HEVs). Heat pump systems can reduce automotive air conditioning heating energy consumption by more than 50%, significantly extending the driving range of electric vehicles, particularly in environments ranging from 0℃ to -15℃. With technological maturity and cost reduction, it is expected to become a standard feature in new energy vehicles. Existing air conditioning system testing methods only include air conditioning system performance testing, and the test conditions and evaluation methods can only be tested through a single performance. For example, bench testing methods include placing the battery refrigerant direct cooling plate, low-pressure temperature and pressure sensor, electronic expansion valve, and temperature control heating device in the auxiliary evaporation chamber of the enthalpy difference bench chamber, and placing the temperature control heating device below the battery refrigerant direct cooling plate; placing the air conditioning controller, pressure switch, evaporator, electromagnetic shut-off valve, and heating, ventilation, and air conditioning assembly in the main evaporation chamber of the enthalpy difference bench chamber. When the subcooling at the outlet of the condenser assembly and the superheat at the outlet of the evaporator and battery refrigerant direct cooling plate are in a stable state, the compressor speed, electronic expansion valve opening, battery refrigerant direct cooling plate temperature, and low-pressure temperature and pressure sensor signals are collected and analyzed.

[0003] The aforementioned testing methods can only perform performance tests on the cooling modes and battery cooling modes of new energy vehicles, but do not include system charge volume and system oil tests, and therefore cannot complete the entire thermal management system test. Furthermore, with the increasing number of components in the thermal management systems of existing new energy vehicles, the air conditioning system needs to interact with more and more automotive cooling components, making the testing of the air conditioning system incomplete.

[0004] Therefore, how to comprehensively test the air conditioning in new energy vehicles is a technical problem that needs to be solved. Summary of the Invention

[0005] The purpose of this application is to provide a method for testing the air conditioning of new energy vehicles. The technical solution of this application can achieve the effect of comprehensively testing the air conditioning of new energy vehicles.

[0006] In a first aspect, embodiments of this application provide a method for testing the air conditioning of a new energy vehicle, including: adding refrigerant to a charge platform in an alternating manner of single evaporator and dual evaporator, and determining the optimal charge amount of the air conditioning based on the plotted single and dual evaporator charge platform curves; adjusting the opening of the electronic expansion valve to adjust the subcooling of the condenser outlet under rated operating conditions, and determining the optimal subcooling of the air conditioning based on the plotted air conditioning subcooling performance curve; and analyzing the air conditioning circulation oil return rate under different modes while ensuring the optimal charge amount and optimal subcooling of the air conditioning.

[0007] In the above embodiments, the optimal charge amount of the air conditioning system can be obtained by alternating between single and dual evaporators. The optimal subcooling can be obtained by adjusting the opening of the electronic expansion valve to adjust the subcooling of the condenser outlet. The compressor oil flow can be accurately measured by analyzing the oil return rate of the air conditioning system under different modes, thus achieving the effect of comprehensively testing the air conditioning of new energy vehicles.

[0008] In some embodiments, the method is performed using an air conditioning system test bench, which includes: a vehicle interior and exterior environment simulation test chamber, a condenser and evaporator enthalpy difference test wind tunnel, an electric compressor high-voltage power supply, an ultrasonic oil circulation rate device, a high-precision air conditioning recovery and charging machine, an automotive air conditioning system control module, and an air conditioning system data acquisition module.

[0009] In the above embodiments, through the coordination of various hardware and software components of the air conditioning system test bench, the various performance characteristics of the air conditioner can be accurately tested in all aspects under different conditions.

[0010] In some embodiments, oil is added to the charge volume platform in an alternating manner with single evaporator and dual evaporator, and the optimal charge volume for air conditioning is determined based on the plotted single and dual evaporator charge volume platform curves. This includes: providing the simulated ambient temperature and humidity inside and outside the vehicle and the condenser intake air velocity according to the test conditions, and controlling the compressor speed and air volume to preset values; controlling the cooling interaction component heating simulation system to a specified heating value; adding refrigerant to the air conditioning system using a high-precision air conditioning recovery charging machine; monitoring and recording the condenser outlet subcooling, compressor suction and discharge pressure, and air-side performance, and plotting the single and dual evaporator charge volume platform curves for the air conditioning system; and selecting the charge volume corresponding to the maximum values ​​of condenser outlet subcooling, compressor suction and discharge pressure, and air-side performance in the single and dual evaporator charge volume platform curves as the optimal charge volume for air conditioning.

[0011] In the above embodiments, during the alternating charging process of a single evaporator and dual evaporators, the condenser outlet subcooling, compressor suction and discharge pressure, and air-side performance can be monitored and recorded to accurately obtain the optimal charging amount for the air conditioner.

[0012] In some embodiments, oil is added to the charge volume platform in an alternating manner between single evaporator and dual evaporator modes, and the optimal charge volume for the air conditioner is determined based on the plotted single / dual evaporator charge volume platform curve. This includes: continuously adding a preset mass of refrigerant to the charge volume platform using a single evaporator; when the data value change is less than a preset threshold after two consecutive charges in the charge volume platform mode, continuously adding a second preset mass of refrigerant to the charge volume platform using a dual evaporator mode, where the data values ​​include: condenser outlet subcooling, compressor discharge pressure, and evaporator outlet superheat; switching back to single evaporator mode when the air conditioner temperature remains constant, and comparing the current data value with the data value before the single evaporator mode to obtain a comparison result; determining whether the refrigerant is still in the charge volume platform based on the comparison result; if the refrigerant is in the charge volume platform, continuing to add refrigerant until the air conditioner temperature remains constant, and then switching back to dual evaporator mode; plotting the single / dual evaporator charge volume platform curve during the above cycle; and selecting the charge volume corresponding to the maximum current data value in the single / dual evaporator charge volume platform curve as the optimal charge volume for the air conditioner.

[0013] In the above embodiments, during the alternation between single evaporator mode and dual evaporator mode, the air conditioning charge amount is continuously recorded, which can quickly obtain the single and dual evaporator charge amount platform curves and the optimal charge amount.

[0014] In some embodiments, under rated operating conditions, adjusting the opening of the electronic expansion valve to adjust the subcooling at the condenser outlet, and determining the optimal subcooling of the air conditioner based on the plotted air conditioner subcooling performance curve, includes: controlling the compressor to rated speed, speed, and speed respectively under rated operating conditions; adjusting the subcooling at the condenser outlet by adjusting the opening of the electronic expansion valve; monitoring and recording the compressor output power and air conditioning cooling performance of the air conditioning system; plotting the condenser subcooling, air conditioning efficiency, and air conditioning performance; and plotting the air conditioner subcooling performance curve; determining the subcooling corresponding to the optimal air conditioning performance coefficient under subcooling conditions as the optimal subcooling.

[0015] In the above embodiments, this application adjusts the subcooling at the condenser outlet by regulating the opening of the electronic expansion valve, monitors and records the compressor output power and air conditioning cooling performance of the air conditioning system, and plots the condenser subcooling, air conditioning efficiency, and air conditioning performance to quickly obtain the air conditioning subcooling performance curve. This allows for the accurate determination of the optimal subcooling.

[0016] In some embodiments, under the condition of ensuring the optimal air conditioning charge and the optimal subcooling, the air conditioning circulation oil return rate under different modes is analyzed, including: under the condition of ensuring the optimal air conditioning charge and the optimal subcooling, acquiring various data from various measuring instruments, including: excess pipeline volume, ultrasonic oil circulation sensor volume, and refrigerant density; and analyzing the air conditioning circulation oil return rate under normal cooling and heating conditions and extreme cooling and heating conditions by acquiring various data.

[0017] In the above embodiments, this application can accurately analyze the air conditioning circulation oil return rate based on various data under both conventional cooling and heating conditions and extreme cooling and heating conditions.

[0018] In some embodiments, after analyzing the air conditioning circulation oil return rate under different modes, under the condition of ensuring the optimal air conditioning charge and optimal air conditioning subcooling, the method further includes: outputting a test report, which includes: optimal charge, optimal air conditioning subcooling, air conditioning circulation oil return rate, condenser outlet subcooling, compressor suction and discharge pressure, air-side performance, compressor discharge pressure, and evaporator outlet superheat.

[0019] In the above embodiments, the test report can be used to quickly read the relevant test parameters of the air conditioner.

[0020] Secondly, embodiments of this application provide an apparatus for testing the air conditioning of a new energy vehicle, comprising:

[0021] The air conditioning system charge test module is used to add refrigerant to the charge platform in an alternating manner of single evaporator and dual evaporator, and determine the optimal charge of the air conditioner based on the plotted single and dual evaporator charge platform curves.

[0022] The air conditioning system performance testing module is used to adjust the opening of the electronic expansion valve to regulate the subcooling of the condenser outlet under rated operating conditions, and to determine the optimal subcooling of the air conditioner based on the plotted air conditioning subcooling performance curve.

[0023] The air conditioning system oil circulation test module is used to analyze the air conditioning circulation oil return rate under different modes, while ensuring the optimal charge and subcooling of the air conditioning system.

[0024] Optionally, the device can be an air conditioning system test bench, which includes: a vehicle interior and exterior environment simulation test chamber, a condenser and evaporator enthalpy difference test wind tunnel, an electric compressor high-voltage power supply, an ultrasonic oil circulation rate device, a high-precision air conditioning recovery and charging machine, an automotive air conditioning system control module, and an air conditioning system data acquisition module.

[0025] Optionally, the air conditioning system charge quantity test module is specifically used for:

[0026] Based on the test conditions, the simulated temperature and humidity inside and outside the vehicle and the condenser air intake speed are given, and the compressor speed and air volume are controlled to the preset values.

[0027] Control the cooling system of the interactive component's heat generation simulation system to a specified heat value;

[0028] Refrigerant is added to the air conditioner using a high-precision air conditioner refrigerant recovery and charging machine;

[0029] Monitor and record the condenser outlet subcooling, compressor suction and discharge pressures, and air-side performance; plot the single and dual evaporation charge platform curves of the air conditioning system.

[0030] The optimal charge quantity for air conditioning is determined by selecting the charge quantity corresponding to the maximum values ​​of condenser outlet subcooling, compressor suction and discharge pressure, and air-side performance in the single and double evaporation charge quantity platform curves.

[0031] Optionally, the air conditioning system charge quantity test module is specifically used for:

[0032] The refrigerant is continuously charged to a preset mass based on a single evaporator as the charging platform.

[0033] When the data value change is less than the preset threshold after two consecutive charges on the charge platform, the second preset mass of refrigerant is continuously added to the charge platform according to the dual evaporator method. The data values ​​include: condenser outlet subcooling, compressor discharge pressure and evaporator outlet superheat.

[0034] When the air conditioner temperature remains constant, switch back to single evaporator mode and compare the data value at this time with the data value before single evaporator mode to obtain the comparison result.

[0035] Determine whether the refrigerant is still within the charge level plateau based on the comparison results;

[0036] Continue adding refrigerant to the charging platform until the air conditioning temperature remains constant, then switch to dual-evaporation mode.

[0037] Based on the above method, plot the single and double steam injection volume plateau curves during the cyclic process;

[0038] The charge amount corresponding to the largest current data value in the single and double steam charge amount platform curve is selected as the optimal charge amount for air conditioning.

[0039] Optionally, the air conditioning system performance testing module is specifically used for:

[0040] Under rated operating conditions, the compressor is controlled to the rated speed, speed, and speed respectively;

[0041] The subcooling of the condenser outlet is adjusted by regulating the opening of the electronic expansion valve. The compressor output power and air conditioning cooling performance of the air conditioning system are monitored and recorded. The subcooling of the condenser, the air conditioning efficiency and the air conditioning performance are plotted, and the subcooling performance curve is plotted.

[0042] The optimal subcooling is defined as the subcooling at which the coefficient of performance (COP) of the air conditioner is at its best.

[0043] Optionally, the air conditioning system oil circulation test module is specifically used for:

[0044] Under the condition of ensuring the optimal charge and subcooling of the air conditioner, various data are obtained from multiple measuring instruments, including: excess pipeline volume, ultrasonic oil circulation sensor volume, and refrigerant density.

[0045] The air conditioning oil return rate was analyzed using various data obtained under both normal cooling and heating conditions and extreme cooling and heating conditions.

[0046] Optionally, the device further includes:

[0047] The output module is used to analyze the air conditioning system oil circulation test module under different modes and output a test report after ensuring the optimal charge and subcooling of the air conditioning system. The test report includes: optimal charge, optimal subcooling of the air conditioning system, oil circulation return rate of the air conditioning system, subcooling of the condenser outlet, compressor suction and discharge pressure, air-side performance, compressor discharge pressure, and superheat of the evaporator outlet.

[0048] Thirdly, embodiments of this application provide an electronic device, including a processor and a memory, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the steps of the method provided in the first aspect above are performed.

[0049] Fourthly, embodiments of this application provide a readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the steps of the method provided in the first aspect above.

[0050] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. Attached Figure Description

[0051] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 A flowchart illustrating a method for testing the air conditioning system of a new energy vehicle, provided as an embodiment of this application;

[0053] Figure 2 This application provides a schematic diagram of a test structure for an air conditioner in a new energy vehicle.

[0054] Figure 3A schematic block diagram of a device for testing the air conditioning of a new energy vehicle, provided as an embodiment of this application;

[0055] Figure 4 A schematic block diagram of a device for testing the air conditioning of a new energy vehicle, provided as an embodiment of this application;

[0056] Figure 5 This is a schematic block diagram of a device for testing the air conditioning of a new energy vehicle, provided as an embodiment of this application. Detailed Implementation

[0057] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0058] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0059] First, some of the terms used in the embodiments of this application will be explained to facilitate understanding by those skilled in the art.

[0060] A Map (or mapping table) is an abstract data structure that stores key-value pairs, allowing for quick lookup of the corresponding value using a unique key. Its core features include key uniqueness, efficient query performance (average time complexity O(1)), and dynamic addition and deletion capabilities. It is widely used in programming languages ​​(such as Java's HashMap and Go's map) and databases.

[0061] The Coefficient of Performance (COP) is a core parameter for measuring the energy conversion efficiency of a refrigeration system. It is defined as the ratio of system output heat to input energy and is commonly used in refrigeration systems, heat pump cycles, and renewable energy utilization.

[0062] Vehicle OCR testing refers to the process of automatically recognizing and testing vehicle-related documents and markings using Optical Character Recognition (OCR) technology. OCR technology can convert text in images into editable text and is widely used in vehicle inspection and registration.

[0063] This application applies to automotive air conditioning testing scenarios, specifically air conditioning system charge quantity testing, air conditioning system performance testing, and air conditioning system oil circulation testing principles and experiments in heat pump air conditioning system testing. Specifically, it determines the optimal COP of the system by testing the subcooling MAP table, completing the optimal performance test of the heat pump air conditioning system with an electronic expansion valve. For OCR testing, a sight glass is installed at the compressor suction end to achieve real-time monitoring of compressor oil flow. While ensuring visualization of the oil circulation status, it accurately measures the compressor oil flow, thereby significantly improving the experimental accuracy of OCR testing.

[0064] With the rapid development of China's economy and automotive industry, automotive thermal management technology, as a crucial component of the vehicle system, has become a highlight of competition among automakers. The rapid development of new energy vehicles has significantly increased the importance of the vehicle's thermal management system, and thermal management system testing, as a means of assessing its comprehensive performance, plays an irreplaceable and critical role. Currently, new energy vehicle air conditioning systems not only utilize air conditioning heat pump technology but also facilitate heat exchange between the vehicle's cooling system and the battery cooling system. Automotive air conditioning heat pump systems offer significant advantages in energy saving, especially crucial for improving the driving range of electric vehicles (EVs) and hybrid electric vehicles (HEVs). Heat pump systems can reduce automotive air conditioning heating energy consumption by more than 50%, significantly extending the driving range of electric vehicles, particularly in environments ranging from 0℃ to -15℃. With technological maturity and cost reduction, it is expected to become a standard feature in new energy vehicles. Existing air conditioning system testing methods only include performance testing, and the test conditions and evaluation methods can only test a single performance aspect. For example, bench testing methods involve placing the battery refrigerant direct cooling plate, low-pressure temperature and pressure sensor, electronic expansion valve, and temperature regulating heating device in the auxiliary evaporator chamber of the enthalpy difference bench chamber, with the temperature regulating heating device placed below the battery refrigerant direct cooling plate; and placing the air conditioning controller, pressure switch, evaporator, electromagnetic shut-off valve, and heating, ventilation, and air conditioning assembly in the main evaporator chamber of the enthalpy difference bench chamber. When the subcooling at the condenser assembly outlet and the superheat at the evaporator and battery refrigerant direct cooling plate outlet are in a stable state, the compressor speed, electronic expansion valve opening, battery refrigerant direct cooling plate temperature, and low-pressure temperature and pressure sensor signals are collected and analyzed. These testing methods can only complete performance testing of the cooling mode and battery cooling mode of new energy vehicles, but do not include system charge quantity and system oil testing, and cannot complete the entire thermal management system test. Furthermore, the number of components in the thermal management system of existing new energy vehicles has increased, and the air conditioning system needs to interact with more and more automotive cooling components, making the testing of the air conditioning system incomplete.

[0065] Therefore, this application uses alternating methods of adding refrigerant to the charging platform using a single evaporator and dual evaporators, and determines the optimal charging amount of the air conditioner based on the plotted single and dual evaporator charging platform curves. Under rated operating conditions, the opening of the electronic expansion valve is adjusted to regulate the subcooling at the condenser outlet, and the optimal subcooling is determined based on the plotted air conditioner subcooling performance curve. Under the condition of ensuring the optimal charging amount and optimal subcooling, the air conditioner circulation oil return rate under different modes is analyzed. The optimal charging amount can be obtained by testing the air conditioner system charging amount using alternating methods of single and dual evaporators; the optimal subcooling can be obtained by testing the air conditioner system performance by adjusting the opening of the electronic expansion valve to regulate the subcooling at the condenser outlet; and the oil circulation test of the air conditioner system by analyzing the air conditioner circulation oil return rate under different modes can accurately measure the compressor oil flow rate, achieving a comprehensive test effect for the air conditioner of new energy vehicles.

[0066] In this embodiment of the application, the executing entity can be the testing equipment for testing new energy vehicle air conditioning systems. In practical applications, the testing equipment for testing new energy vehicle air conditioning systems can be electronic devices such as terminal devices and servers, and there are no restrictions here.

[0067] The following is combined with Figure 1 The method for testing the air conditioning of new energy vehicles according to the embodiments of this application will be described in detail.

[0068] Please refer to Figure 1 , Figure 1 A flowchart of a method for testing the air conditioning of a new energy vehicle is provided as an embodiment of this application, such as... Figure 1 The methods for testing the air conditioning of new energy vehicles shown include:

[0069] Step 110: Add refrigerant to the charge platform by alternating between single evaporator and dual evaporator, and determine the optimal charge for the air conditioner based on the plotted single and dual evaporator charge platform curves.

[0070] The refrigerant can be refrigerated coal, or it can include refrigeration oil and other refrigerants.

[0071] In some embodiments of this application, the method is performed using an air conditioning system test bench, which includes: a vehicle interior and exterior environment simulation test chamber, a condenser and evaporator enthalpy difference test wind tunnel, an electric compressor high-voltage power supply, an ultrasonic oil circulation rate device, a high-precision air conditioning recovery and refill machine, an automotive air conditioning system control module, and an air conditioning system data acquisition module.

[0072] In the aforementioned process, through the coordination of various hardware and software components of the air conditioning system test bench, this application can comprehensively and accurately test the various performance characteristics of the air conditioner under different conditions.

[0073] Specifically, the air conditioning system test bench can be used to... Figure 2 The schematic diagram of the air conditioning system test bench shown is described in detail.

[0074] Please refer to Figure 2 , Figure 2 A schematic diagram of an air conditioning system test bench provided in this application includes:

[0075] Vehicle interior and exterior environment simulation test chamber, condenser and evaporator enthalpy difference wind tunnel, electric compressor high-voltage power supply, ultrasonic oil circulation rate equipment, high-precision air conditioning recovery and charging machine, automotive air conditioning system control module and air conditioning system data acquisition module (data acquisition).

[0076] This also includes air conditioning units, a cooling interactive heat simulation system, a refrigerant charging machine, a condenser compartment, a high-voltage power supply, a control system, and an equipment operating room.

[0077] Figure 2 The specific implementation process shown can be achieved through Figure 1 The methods and steps shown will not be elaborated further here.

[0078] In some embodiments of this application, oil is added to the charge volume platform in an alternating manner of single evaporator and dual evaporator, and the optimal charge volume of the air conditioner is determined based on the plotted single and dual evaporator charge volume platform curves. This includes: providing the simulated temperature and humidity of the vehicle interior and exterior environment and the condenser intake air velocity according to the test conditions, and controlling the compressor speed and air volume to preset values; controlling the cooling interaction component heat simulation system to a specified heat value; adding refrigerant to the air conditioner using a high-precision air conditioner recovery charging machine; monitoring and recording the condenser outlet subcooling, compressor suction and discharge pressure, and air-side performance, and plotting the single and dual evaporator charge volume platform curves of the air conditioning system; and selecting the charge volume corresponding to the maximum values ​​of condenser outlet subcooling, compressor suction and discharge pressure, and air-side performance in the single and dual evaporator charge volume platform curves as the optimal charge volume of the air conditioner.

[0079] In the above process, during the alternating charging of a single evaporator and dual evaporators, this application can monitor and record the condenser outlet subcooling, compressor suction and discharge pressure, and air-side performance to accurately obtain the optimal charging amount for the air conditioner.

[0080] The preset values ​​can be set according to requirements.

[0081] For example, before the test, the air conditioning refrigerant charge is estimated based on the air conditioning pipeline volume (calculated as: liquid pipeline volume (V1) × R134a liquid density (ρ) + gas-liquid two-phase pipeline volume (V2) × R134a liquid density (ρ) / 2), and then reduced by 200g as the starting point for the test. The air conditioning system is installed on the air conditioning system test bench according to the actual vehicle pipeline conditions. A condenser outlet TP sensor, an electric compressor intake and exhaust TP sensor, and an evaporator outlet TP sensor are installed, and data is collected using a data acquisition module. Based on the test conditions, the simulated indoor and outdoor ambient temperature and humidity, and the condenser intake air velocity are given. The air conditioning system control module controls the compressor speed and HVAC airflow to specified values, and controls the cooling interaction component heating simulation system to specified heating values. Refrigerant is added using a high-precision air conditioning recovery and charging machine. The condenser outlet subcooling, compressor intake and exhaust pressures, and HVAC air-side performance are monitored and recorded to plot the air conditioning system charge plateau curve.

[0082] In some embodiments of this application, oil is added to the charge volume platform in an alternating manner between single evaporator and dual evaporator modes. The optimal charge volume for the air conditioner is determined based on the plotted single / dual evaporator charge volume platform curves. This includes: continuously adding a preset mass of refrigerant to the charge volume platform using a single evaporator; when the data value change is less than a preset threshold after two consecutive charges in the charge volume platform mode, continuously adding a second preset mass of refrigerant to the charge volume platform using a dual evaporator mode, where the data values ​​include: condenser outlet subcooling, compressor discharge pressure, and evaporator outlet superheat; switching back to single evaporator mode when the air conditioner temperature remains constant, and comparing the current data value with the data value before the single evaporator mode to obtain a comparison result; determining whether the refrigerant is still in the charge volume platform based on the comparison result; if the refrigerant is in the charge volume platform, continuing to add refrigerant until the air conditioner temperature remains constant before switching back to dual evaporator mode; plotting single / dual evaporator charge volume platform curves during the above-described cyclic process; and selecting the charge volume corresponding to the maximum current data value in the single / dual evaporator charge volume platform curve as the optimal charge volume for the air conditioner.

[0083] In the above process, during the alternation between single evaporator mode and dual evaporator mode, this application continuously records the air conditioning charge amount, which can quickly obtain the single and dual evaporator charge amount platform curves and the optimal charge amount.

[0084] The preset refrigerant mass, preset threshold, and second preset threshold can be set according to requirements.

[0085] For example, a heat pump air conditioning system for a new energy vehicle can use multiple evaporators. The test begins by charging each evaporator individually, 50g at a time. Once the charge level plateau is reached (determined by two consecutive charges where there are no significant changes in condenser outlet subcooling, compressor discharge pressure, and evaporator outlet superheat), 25g is added each time. At this point, the system switches to dual evaporator mode and continues charging until stabilization. Then, it switches back to single evaporator mode. This data is compared to the data before the single / dual evaporator switch to observe if the system is still on the plateau. If it is, refrigerant is added again until stabilization, then the system switches back to dual evaporator mode to observe if it reaches the plateau. This cycle is repeated to measure the single / dual evaporator charge level plateau curve of the air conditioning system.

[0086] Step 120: Under rated operating conditions, adjust the opening of the electronic expansion valve to adjust the subcooling at the condenser outlet, and determine the optimal subcooling of the air conditioner based on the plotted air conditioner subcooling performance curve.

[0087] In some embodiments of this application, under rated operating conditions, the subcooling degree at the condenser outlet is adjusted by regulating the opening of the electronic expansion valve, and the optimal subcooling degree of the air conditioner is determined based on the plotted air conditioner subcooling performance curve. This includes: controlling the compressor to the rated speed, speed, and speed respectively under rated operating conditions; adjusting the subcooling degree at the condenser outlet by adjusting the opening of the electronic expansion valve; monitoring and recording the compressor output power and air conditioning cooling performance of the air conditioning system; plotting the condenser subcooling degree, air conditioning efficiency, and air conditioning performance; and plotting the air conditioner subcooling performance curve; and determining the subcooling degree corresponding to the optimal air conditioning performance coefficient under the subcooling degree as the optimal subcooling degree.

[0088] In the above process, this application adjusts the subcooling at the condenser outlet by regulating the opening of the electronic expansion valve, monitors and records the compressor output power and air conditioning cooling performance of the air conditioning system, and plots the condenser subcooling, air conditioning efficiency, and air conditioning performance to quickly obtain the air conditioning subcooling performance curve. This allows for the accurate determination of the optimal subcooling.

[0089] The rated speed, speed, and rotational speed can be set according to requirements.

[0090] For example, after determining the optimal charge amount for the air conditioning system, performance testing should be conducted. Before performance testing, the optimal subcooling degree needs to be calibrated. Keeping the air conditioning system test bench unchanged, the compressor is controlled to its rated speed, maximum speed, and low speed under rated operating conditions. The subcooling degree at the condenser outlet is adjusted by regulating the opening of the electronic expansion valve. The compressor output power and air conditioning cooling performance are monitored and recorded, and a curve of condenser subcooling degree (SC), air conditioning efficiency (COP), and air conditioning performance is plotted. The optimal subcooling degree is determined by analyzing the curve to identify the optimal COP. Finally, the determined optimal subcooling degree is used to conduct performance tests on the air conditioning system under various operating conditions.

[0091] Step 130: Under the condition of ensuring the optimal charge and subcooling of the air conditioner, analyze the oil return rate of the air conditioner circulation under different modes.

[0092] The different modes include conventional cooling and heating conditions and extreme cooling and heating conditions.

[0093] In some embodiments of this application, under the condition of ensuring the optimal air conditioning charge and the optimal subcooling, the air conditioning circulation oil return rate under different modes is analyzed, including: under the condition of ensuring the optimal air conditioning charge and the optimal subcooling, acquiring various data from various measuring instruments, including: excess pipeline volume, ultrasonic oil circulation sensor volume, and refrigerant density; and analyzing the air conditioning circulation oil return rate under normal cooling and heating conditions and extreme cooling and heating conditions by acquiring various data.

[0094] In the above process, under both conventional cooling and heating conditions and extreme cooling and heating conditions, this application can accurately analyze the air conditioning circulation oil return rate based on various data.

[0095] Among them are various measuring instruments, including a redundant pipeline volume measuring instrument, an ultrasonic oil circulation sensor, and a refrigerant density measuring instrument.

[0096] For example, system oil circulation tests need to be conducted under known optimal charge and subcooling conditions. Before the test, the air conditioning piping needs to be cleaned to ensure that no compressor lubricating oil remains in any air conditioning components except for the compressor's factory-installed lubricating oil. After ensuring these conditions, the piping is modified, with an ultrasonic oil circulation rate sensor installed in the pure liquid section of the system and an oil level sight glass installed in the compressor suction section. Finally, based on the system's optimal charge, excess refrigerant is added to the ultrasonic oil circulation sensor and the modified piping. The excess refrigerant is calculated as (Excess refrigerant = (Excess piping volume + Ultrasonic oil circulation sensor volume) × Refrigerant density). The system oil circulation rate is monitored using ultrasonic oil circulation rate testing equipment, and the refrigerant return is observed through the oil level sight glass. In addition to the conventional cooling and heating conditions (evaluating whether the oil circulation and oil return rate of the air conditioning system meet the design requirements under normal operating conditions) and the extreme cooling and heating conditions (evaluating whether the oil circulation of the air conditioning system meets the design requirements under the minimum and maximum compressor load conditions), a refrigerant lower limit oil circulation test has been added. This test is to verify whether the leakage of refrigerant in the system to the lower limit of the charge quantity after many years of operation will cause compressor damage.

[0097] In some embodiments of this application, after analyzing the air conditioning circulation oil return rate under different modes, under the condition of ensuring the optimal air conditioning charge and optimal air conditioning subcooling, the method further includes: outputting a test report, which includes: optimal charge, optimal air conditioning subcooling, air conditioning circulation oil return rate, condenser outlet subcooling, compressor suction and discharge pressure, air-side performance, compressor discharge pressure, and evaporator outlet superheat.

[0098] In the above process, the relevant test parameters of the air conditioner can be quickly read through the test report.

[0099] In the above Figure 1 In the process described, this application adds refrigerant to the charging platform by alternating between single and dual evaporators, and determines the optimal charging amount of the air conditioner based on the plotted single / dual evaporator charging platform curves. Under rated operating conditions, the opening of the electronic expansion valve is adjusted to regulate the subcooling at the condenser outlet, and the optimal subcooling is determined based on the plotted air conditioner subcooling performance curve. Under the condition of ensuring the optimal charging amount and optimal subcooling, the air conditioner circulation oil return rate under different modes is analyzed. The optimal charging amount can be obtained by alternating between single and dual evaporators for air conditioner system charging amount testing; the optimal subcooling can be obtained by adjusting the opening of the electronic expansion valve to regulate the subcooling at the condenser outlet for air conditioner system performance testing; and the compressor oil flow can be accurately measured by analyzing the air conditioner circulation oil return rate under different modes for air conditioner system oil circulation testing, achieving the effect of comprehensive testing of new energy vehicle air conditioners.

[0100] The following is combined with Figure 3 The implementation method for testing the air conditioning of new energy vehicles according to the embodiments of this application will be described in detail.

[0101] Please refer to Figure 3 , Figure 3 A flowchart illustrating an implementation method for testing the air conditioning system of a new energy vehicle, as provided in this application embodiment, is shown below. Figure 3 The implementation method for testing the air conditioning of new energy vehicles shown includes:

[0102] Step 310: Air conditioning system charge test.

[0103] Specifically: Install the test specimen onto the air conditioning system test bench according to the actual vehicle piping layout. Connect the TP sensor to the data acquisition module and set the real-time calculation formula for supercooling and superheat. Pre-charge using a high-precision recovery charging machine at the determined starting point. Set the temperature and wind speed of the environmental chamber and enthalpy difference wind tunnel according to the charging load conditions. Generally, the standard load for both chambers is an ambient temperature of 38℃ and humidity of 50%; the standard load for the heat pump is an ambient temperature of -10℃ and humidity of 0%; the condenser enthalpy difference wind tunnel inlet air temperature is set according to the condenser chamber; the condenser inlet air velocity is 1.67 m / s at the standard load; the evaporator enthalpy difference wind tunnel wind velocity is set according to the rated airflow of the HVAC outlet. After all operating conditions stabilize, start the air conditioning system in single-evaporation mode to begin testing. Using a high-precision refrigerant recovery and charging machine, 50g of refrigerant is added to the compressor's suction section. After the system stabilizes for 30 minutes, data is recorded (including all TP sensor readings and real-time calculated subcooling and superheat values). Another 50g of refrigerant is added, and data is recorded again. This process is repeated. If there is no significant change in the recorded data after two consecutive additions, it indicates that the system has entered the charging plateau, and the amount added each time is reduced to 25g. Once in the charging plateau, the system is switched to dual-evaporation mode. After recording data, 25g of refrigerant is added, and then the system is switched to single-evaporation mode. If there is no sudden change in data, the system is switched back to dual-evaporation mode, data is recorded, and another 25g of refrigerant is added, followed by switching back to single-evaporation mode. This process is repeated until there is no change in data after two consecutive switches to dual-evaporation mode. Single-evaporation mode is then used for charging until it reaches the overcharge point (the point of data mutation). The refrigerant amount is then reduced to 10g, and the system is switched back to dual-evaporation mode. The system is then switched back to dual-evaporation mode until it also reaches the overcharge point, and then 25g is added three more times before stopping charging. Stop the test, plot the refrigerant charge curve, and mark the plateau points and overcharge points for both single-evaporation and dual-evaporation modes. Switch the system to heat pump mode and repeat the above operations, plotting the refrigerant charge curve again. Complete the charge test, and determine the optimal charge for the system by fitting the refrigerant charge curves for both heat pump and cooling modes (the optimal charge calculation method is: minimum system plateau point + 10g refrigerant leakage over 10 years × number of air conditioning system connections + 50g factory charging machine error).

[0104] Step 320: Air conditioning system performance test.

[0105] Specifically: Charge the air conditioning system according to the optimal charge level. Install PT sensors and connect them to the data acquisition module, setting the subcooling and superheating calculation formulas. Set the optimal subcooling calibration conditions for cooling mode, typically 38℃ and 50% humidity for the condenser compartment, and 27℃ and 35% humidity for the evaporator compartment. After the conditions stabilize, start the air conditioning system and control the compressor to its rated speed, maximum speed, and low speed modes, testing the system's COP and cooling performance at subcooling levels of 5℃, 10℃, 15℃, and 20℃ respectively. Plot the condenser SC / COP / air conditioning performance curves and select the subcooling corresponding to the optimal COP as the optimal subcooling for system cooling. Set the optimal subcooling calibration conditions for heat pump mode, typically -10℃ and 0% humidity for both the condenser and evaporator compartments. After the conditions stabilize, start the air conditioning system and control the compressor to its rated speed mode, testing the system's COP and heating performance at subcooling levels of 5℃, 10℃, 15℃, and 20℃ respectively. Plot the condenser SC / COP / air conditioning performance curves and select the subcooling corresponding to the optimal COP to determine the optimal subcooling of the system heat pump. Control the electronic expansion valve of the system according to the optimal subcooling for cooling and conduct routine performance tests (routine performance tests generally include rated cooling condition, high-load cooling condition, low-load cooling condition, water cooling condition, etc.). Control the electronic expansion valve of the system according to the optimal subcooling of the heat pump and conduct routine performance tests (routine performance tests generally include frosting condition, rated heating condition, high-load heating condition, waste heat recovery condition, etc.). Complete the performance tests, record the data for each set of tests, and evaluate whether they meet the thermal management performance design requirements.

[0106] Step 330: Air conditioning system oil circulation test.

[0107] Specifically: After completing system piping cleaning and compressor oil filling, install the air conditioning system on the test bench, set up the ultrasonic oil circulation rate sensor and oil level sight glass (ensuring no significant rise in piping from the sight glass to the compressor suction port), and add refrigerant. Start the air conditioning system and test it under normal oil circulation conditions, generally including normal cooling and heating conditions and extreme cooling and heating conditions. After the system runs stably under each condition, record the system oil circulation values ​​and the state of the oil return sight glass. Determine whether the oil circulation meets the requirements based on the test oil circulation rate values, and determine the oil return level based on the oil level in the sight glass. The oil return levels are divided into LV1: no oil return throughout; LV2: some wavy oil return at the bottom; LV3: more wavy oil return at the bottom; LV4: good oil return at the bottom and wavy oil return at the top; LV5: wavy oil return throughout. An oil return level of LV3 is considered qualified. After completing the standard oil circulation test, the air conditioning system is cleaned again and refilled with oil for a refrigerant lower limit test. The refrigerant is added according to the minimum charge amount specified in the charge test (referring to the minimum starting charge point of the system, without adding extra refrigerant for leakage or factory error). Then, the test is performed again according to the standard oil circulation test conditions described above. The test results are evaluated according to the evaluation method in step C. The oil circulation test is now complete.

[0108] also, Figure 3 The specific methods and steps shown can be found in [reference]. Figure 1 The method shown will not be elaborated further here.

[0109] The previous text passed Figure 1 , Figure 3 The method for testing the air conditioning of new energy vehicles is described below. Figures 4-5 Describe the apparatus for testing the air conditioning system of a new energy vehicle.

[0110] Please refer to Figure 4 This is a schematic block diagram of a device 400 for testing the air conditioning of a new energy vehicle, provided in an embodiment of this application. The device 400 can be a module, program segment, or code on an electronic device. This device 400 is similar to the one described above. Figure 1 The method implementation corresponds to this and can be executed. Figure 1 The various steps involved in the method embodiment, and the specific functions of the device 400, can be found in the following description. To avoid repetition, detailed descriptions are omitted here.

[0111] Optionally, the device 400 includes:

[0112] The air conditioning system charge quantity test module 410 is used to add refrigerant to the charge quantity platform in an alternating manner of single evaporator and dual evaporator, and determine the optimal charge quantity of the air conditioner based on the plotted single and dual evaporator charge quantity platform curves.

[0113] The air conditioning system performance test module 420 is used to adjust the opening of the electronic expansion valve to regulate the subcooling of the condenser outlet under rated operating conditions, and to determine the optimal subcooling of the air conditioner based on the plotted air conditioning subcooling performance curve.

[0114] The air conditioning system oil circulation test module 430 is used to analyze the air conditioning circulation oil return rate under different modes, while ensuring the optimal charge and subcooling of the air conditioning system.

[0115] Optionally, the device can be an air conditioning system test bench, which includes: a vehicle interior and exterior environment simulation test chamber, a condenser and evaporator enthalpy difference test wind tunnel, an electric compressor high-voltage power supply, an ultrasonic oil circulation rate device, a high-precision air conditioning recovery and charging machine, an automotive air conditioning system control module, and an air conditioning system data acquisition module.

[0116] Optionally, the air conditioning system charge quantity test module is specifically used for:

[0117] Based on the test conditions, the simulated ambient temperature and humidity inside and outside the vehicle, as well as the condenser intake air velocity, are given, and the compressor speed and air volume are controlled to preset values; the heat simulation system of the cooling interaction components is controlled to the specified heat value; refrigerant is added to the air conditioner using a high-precision air conditioning recovery and charging machine; the condenser outlet subcooling, compressor suction and discharge pressure, and air-side performance are monitored and recorded, and the single and dual evaporation charge platform curves of the air conditioning system are plotted; the charge amount corresponding to the maximum values ​​of condenser outlet subcooling, compressor suction and discharge pressure, and air-side performance in the single and dual evaporation charge platform curves is selected as the optimal charge amount for the air conditioner.

[0118] Optionally, the air conditioning system charge quantity test module is specifically used for:

[0119] The system continuously adds a preset mass of refrigerant to the single evaporator charging platform. When the data value change after two consecutive charges is less than a preset threshold, a second preset mass of refrigerant is added to the dual evaporator charging platform. The data values ​​include: condenser outlet subcooling, compressor discharge pressure, and evaporator outlet superheat. When the air conditioner temperature remains constant, the system switches back to single evaporator mode and compares the current data value with the data value before switching to single evaporator mode. Based on the comparison result, it is determined whether the refrigerant is still in the charging platform. If the refrigerant is in the charging platform, refrigerant is added until the air conditioner temperature remains constant before switching back to dual evaporator mode. The single / dual evaporator charging platform curves are plotted during the above cycle. The charging amount corresponding to the maximum current data value in the single / dual evaporator charging platform curves is selected as the optimal charging amount for the air conditioner.

[0120] Optionally, the air conditioning system performance testing module is specifically used for:

[0121] Under rated operating conditions, the compressor is controlled to the rated speed, speed, and speed respectively; the subcooling of the condenser outlet is adjusted by adjusting the opening of the electronic expansion valve; the compressor output power and air conditioning cooling performance of the air conditioning system are monitored and recorded; the subcooling of the condenser, the air conditioning efficiency and the air conditioning performance are plotted; and the subcooling performance curve is plotted; the subcooling corresponding to the optimal air conditioning performance coefficient under the subcooling condition is taken as the optimal subcooling.

[0122] Optionally, the air conditioning system oil circulation test module is specifically used for:

[0123] Under the conditions of ensuring the optimal charge and subcooling of the air conditioner, various data are obtained from multiple measuring instruments, including: excess pipeline volume, ultrasonic oil circulation sensor volume, and refrigerant density; under normal cooling and heating conditions and extreme cooling and heating conditions, the air conditioner circulation oil return rate is analyzed by acquiring various data.

[0124] Optionally, the device further includes:

[0125] The output module is used to analyze the air conditioning system oil circulation test module under different modes and output a test report after ensuring the optimal charge and subcooling of the air conditioning system. The test report includes: optimal charge, optimal subcooling of the air conditioning system, oil circulation return rate of the air conditioning system, subcooling of the condenser outlet, compressor suction and discharge pressure, air-side performance, compressor discharge pressure, and superheat of the evaporator outlet.

[0126] Please refer to Figure 5 This is a schematic block diagram of a device for testing the air conditioning of a new energy vehicle, provided in an embodiment of this application. The device may include a memory 510 and a processor 520. Optionally, the device may further include a communication interface 530 and a communication bus 540. This device is similar to the one described above. Figure 1 The method implementation corresponds to this and can be executed. Figure 1 The specific functions of the device involved in the method embodiments can be found in the following description.

[0127] Specifically, memory 510 is used to store computer-readable instructions.

[0128] Processor 520 is used to process readable instructions stored in memory and is capable of executing... Figure 1 Each step in the method.

[0129] The communication interface 530 is used for signaling or data communication with other node devices. For example, it is used for communication with a server or terminal, or for communication with other device nodes, but the embodiments of this application are not limited thereto.

[0130] Communication bus 540 is used to enable direct communication between the above components.

[0131] In this embodiment, the communication interface 530 of the device is used for signaling or data communication with other node devices. The memory 510 can be high-speed RAM or non-volatile memory, such as at least one disk storage device. Optionally, the memory 510 can also be at least one storage device located remotely from the aforementioned processor. The memory 510 stores computer-readable instructions, which, when executed by the processor 520, enable the electronic device to perform the aforementioned... Figure 1 The method process is shown. The processor 520 can be used on the device 400 and is used to perform the functions in this application. Exemplarily, the processor 520 described above can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components, and the embodiments of this application are not limited thereto.

[0132] This application embodiment also provides a readable storage medium, wherein when the computer program is executed by a processor, it performs the following... Figure 1 The method process executed by the electronic device in the illustrated method embodiment.

[0133] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the device described above can be referred to the corresponding process in the aforementioned method, and will not be elaborated further here.

[0134] In summary, this application provides a method, apparatus, equipment, and storage medium for testing the air conditioning system of a new energy vehicle. The method includes: adding refrigerant to a charge platform using alternating single and dual evaporators, and determining the optimal charge amount based on the plotted single / dual evaporator charge platform curves; adjusting the condenser outlet subcooling under rated operating conditions by regulating the opening of the electronic expansion valve, and determining the optimal subcooling degree based on the plotted air conditioning subcooling performance curve; and analyzing the air conditioning circulation oil return rate under different modes while ensuring the optimal charge amount and optimal subcooling degree. This method can achieve a comprehensive testing effect for the air conditioning system of new energy vehicles.

[0135] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0136] In addition, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0137] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0138] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of 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 principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0139] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

[0140] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 limitations, 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.

Claims

1. A method for testing the air conditioning system of a new energy vehicle, characterized in that, include: Refrigerant was added to the charge platform using alternating methods of single and dual evaporators, and the optimal charge amount for the air conditioner was determined based on the plotted single and dual evaporator charge platform curves. Under rated operating conditions, adjust the opening of the electronic expansion valve to regulate the subcooling at the condenser outlet, and determine the optimal subcooling of the air conditioner based on the plotted air conditioner subcooling performance curve. Under the condition of ensuring the optimal charge amount and the optimal subcooling degree of the air conditioner, the oil return rate of the air conditioner circulation under different modes is analyzed.

2. The method according to claim 1, characterized in that, The method is performed using an air conditioning system test bench, which includes: a vehicle interior and exterior environment simulation test chamber, a condenser and evaporator enthalpy difference test wind tunnel, an electric compressor high-voltage power supply, an ultrasonic oil circulation rate device, a high-precision air conditioning recovery and refill machine, an automotive air conditioning system control module, and an air conditioning system data acquisition module.

3. The method according to claim 1 or 2, characterized in that, The process of adding oil to the charge volume platform using alternating methods of single and dual evaporators, and determining the optimal charge volume for the air conditioner based on the plotted single / dual evaporator charge volume platform curves, includes: Based on the test conditions, the simulated temperature and humidity inside and outside the vehicle and the condenser air intake speed are given, and the compressor speed and air volume are controlled to the preset values. Control the cooling system of the interactive component's heat generation simulation system to a specified heat value; Refrigerant is added to the air conditioner using a high-precision air conditioner refrigerant recovery and charging machine; Monitor and record the condenser outlet subcooling, compressor suction and discharge pressures, and air-side performance; plot the single and dual evaporation charge platform curves of the air conditioning system. The charge amount corresponding to the maximum values ​​of condenser outlet subcooling, compressor suction and discharge pressure, and air-side performance in the single and double evaporation charge amount platform curves is taken as the optimal charge amount for the air conditioner.

4. The method according to claim 1 or 2, characterized in that, The process of adding oil to the charge volume platform using alternating methods of single and dual evaporators, and determining the optimal charge volume for the air conditioner based on the plotted single / dual evaporator charge volume platform curves, includes: The preset mass of refrigerant is continuously added according to the individual evaporator as the charging volume platform; When the data value change is less than a preset threshold after two consecutive charges on the charge volume platform, a second preset mass of refrigerant is continuously added according to the charge volume platform of the dual evaporators. The data values ​​include: condenser outlet subcooling, compressor discharge pressure and evaporator outlet superheat. When the air conditioner temperature remains constant, switch back to single evaporator mode and compare the data value at this time with the data value before single evaporator mode to obtain the comparison result. Based on the comparison results, determine whether the refrigerant is still in the charge level plateau; The refrigerant is added to the charging platform until the air conditioning temperature remains constant before switching to dual-evaporation mode. The single and double steam injection volume plateau curves are plotted during the cyclic process described above. The charge amount corresponding to the largest current data value in the single and double steam charge amount platform curve is selected as the optimal charge amount for the air conditioner.

5. The method according to claim 1 or 2, characterized in that, The process of adjusting the opening of the electronic expansion valve to regulate the subcooling at the condenser outlet under rated operating conditions, and determining the optimal subcooling of the air conditioner based on the plotted air conditioner subcooling performance curve, includes: Under rated operating conditions, the compressor is controlled to the rated speed, speed, and speed respectively; The subcooling of the condenser outlet is adjusted by regulating the opening of the electronic expansion valve. The compressor output power and air conditioning cooling performance of the air conditioning system are monitored and recorded. The subcooling of the condenser, the air conditioning efficiency and the air conditioning performance are plotted, and the subcooling performance curve of the air conditioning is plotted. The optimal subcooling degree is defined as the subcooling degree at which the coefficient of performance (COP) of the air conditioner is at its best.

6. The method according to claim 1 or 2, characterized in that, The analysis of the air conditioning circulation oil return rate under different modes, while ensuring the optimal charge quantity and optimal subcooling degree of the air conditioning, includes: Under the condition of ensuring the optimal charge amount and the optimal subcooling degree of the air conditioner, various data are obtained from various measuring instruments, including: excess pipeline volume, ultrasonic oil circulation sensor volume and refrigerant density; The air conditioning oil return rate is analyzed using the various data obtained under normal cooling and heating conditions and extreme cooling and heating conditions.

7. The method according to claim 1 or 2, characterized in that, After analyzing the air conditioning circulation oil return rate under different modes while ensuring the optimal air conditioning charge and optimal air conditioning subcooling, the method further includes: Output a test report, which includes: the optimal charge amount, the optimal subcooling degree of the air conditioner, the oil return rate of the air conditioner circulation, the subcooling degree of the condenser outlet, the compressor suction and discharge pressure, the air-side performance, the compressor discharge pressure, and the superheat degree of the evaporator outlet.

8. A device for testing the air conditioning of new energy vehicles, characterized in that, include: The air conditioning system charge test module is used to add refrigerant to the charge platform in an alternating manner of single evaporator and dual evaporator, and determine the optimal charge of the air conditioner based on the plotted single and dual evaporator charge platform curves. The air conditioning system performance testing module is used to adjust the opening of the electronic expansion valve to regulate the subcooling of the condenser outlet under rated operating conditions, and to determine the optimal subcooling of the air conditioner based on the plotted air conditioning subcooling performance curve. The air conditioning system oil circulation test module is used to analyze the air conditioning oil return rate under different modes, while ensuring the optimal charge and subcooling of the air conditioner.

9. An electronic device, characterized in that, include: A memory and a processor, the memory storing computer-readable instructions that, when executed by the processor, perform the steps of the method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, include: A computer program that, when run on a computer, causes the computer to perform the method as described in any one of claims 1-7.

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