Method, device and equipment for testing air conditioner of new energy automobile and storage medium

Abstract

The invention 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, and the method comprises the steps: filling a refrigerant for a charge volume platform according to a mode that a single evaporator and double evaporators are alternated, and determining the optimal charge volume of the air conditioner according to a drawn single-double evaporator charge volume platform curve; under the rated working condition, the opening degree of an electronic expansion valve is adjusted, the condenser outlet supercooling degree is adjusted, and the optimal supercooling degree of the air conditioner is determined according to the drawn air conditioner supercooling degree performance curve; and under the condition of ensuring the optimal charging amount and the optimal supercooling degree of the air conditioner, analyzing the circulating oil return rate of the air conditioner in different modes. Through the method, the effect of comprehensively testing the new energy automobile air conditioner can be achieved.

Description

Technical Field

[0001] The present application relates to the field of automotive thermal management, and more specifically, to a method, apparatus, device, and storage medium for testing air conditioners in new energy vehicles. Background Art

[0002] With the rapid development of China's economy and automotive industry, automotive thermal management technology, as a crucial component of the entire vehicle system, has become a key competitive advantage for major automakers. The rapid development of new energy vehicles has significantly increased the importance of vehicle thermal management systems. Thermal management system testing, as a means of assessing their comprehensive performance, plays an irreplaceable and critical role. New energy vehicle air conditioning systems now integrate not only heat pump technology but also the heat exchange interaction between the vehicle's cooling system and the battery cooling system. Heat pump systems offer significant energy savings and are particularly crucial for improving the range of electric vehicles (EVs) and hybrid electric vehicles (HEVs). They can reduce heating energy consumption by over 50%, significantly extending the range of electric vehicles, particularly in temperatures between 0°C and -15°C. As the technology matures and costs decrease, they are expected to become standard equipment in new energy vehicles. The existing air-conditioning system testing method only includes the air-conditioning system performance test, and the test conditions and evaluation methods can only be tested through a single performance. For example, the bench test method includes placing the battery refrigerant direct cooling plate, low-pressure temperature and pressure sensor, electronic expansion valve, and thermostatic heating device in the auxiliary evaporation chamber of the enthalpy difference bench chamber, and placing the thermostatic heating device under the battery refrigerant direct cooling plate; placing the air-conditioning controller, pressure switch, evaporator, electromagnetic stop valve, and heating, ventilation and air conditioning assembly in the main evaporation chamber of the enthalpy difference bench chamber. When the subcooling degree of the condenser assembly outlet and the superheat degree of 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.

[0003] The aforementioned test method only tests the performance of new energy vehicle cooling and battery cooling modes, excluding system charge and oil testing, and therefore cannot fully test the entire thermal management system. Furthermore, with the increasing number of components in the thermal management systems of existing new energy vehicles, the air conditioning system must interact with an increasing number of cooling components, making air conditioning system testing incomplete.

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

[0005] The purpose of the embodiments of the present application is to provide a method for testing the air conditioner of a new energy vehicle. Through the technical solution of the embodiments of the present application, the effect of comprehensively testing the air conditioner of a new energy vehicle can be achieved.

[0006] In the first aspect, an embodiment of the present application provides a method for testing the air conditioner of a new energy vehicle, including filling the filling amount platform with refrigerant in an alternating manner between a single evaporator and a double evaporator, and determining the optimal filling amount of the air conditioner based on the drawn single and double evaporator filling amount platform curves; under rated operating conditions, adjusting the opening of the electronic expansion valve to adjust the subcooling of the condenser outlet, and determining the optimal subcooling of the air conditioner based on the drawn air conditioner subcooling performance curve; while ensuring the optimal filling amount and optimal subcooling of the air conditioner, analyzing the air conditioner circulation oil return rate under different modes.

[0007] In the above embodiments of the present application, the optimal filling amount can be obtained by testing the air-conditioning system filling amount by alternating between a single evaporator and a dual evaporator, the optimal subcooling can be obtained by adjusting the opening of the electronic expansion valve to adjust the condenser outlet subcooling to perform the air-conditioning system performance test, and the compressor oil flow can be accurately measured by analyzing the air-conditioning cycle oil return rate under different modes to perform the air-conditioning system oil circulation test, thereby achieving the effect of comprehensively testing the air-conditioning of new energy vehicles.

[0008] In some embodiments, the method is performed through 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 filling machine, an automobile air-conditioning system control module and an air-conditioning system data acquisition module.

[0009] In the above-mentioned embodiment of the present application, through the coordination of various hardware and software of the air-conditioning system test bench, various performances of the air-conditioning can be accurately tested in all aspects according to different conditions.

[0010] In some embodiments, the oil is added to the filling amount platform in an alternating manner of a single evaporator and a double evaporator, and the optimal filling amount of the air conditioner is determined based on the drawn single and double evaporator filling amount platform curves, including: providing simulated ambient temperature and humidity inside and outside the vehicle and the condenser inlet wind speed according to the test conditions, and controlling the compressor speed and air volume to preset values; controlling the heating simulation system of the cooling interaction component to a specified heating value; filling the air conditioner with refrigerant through a high-precision air conditioning recovery and filling machine; monitoring and recording the condenser outlet subcooling, compressor suction and exhaust pressure and air side performance, and drawing the single and double evaporator filling amount platform curves of the air conditioning system; selecting the filling amount corresponding to the maximum value of the condenser outlet subcooling, compressor suction and exhaust pressure and air side performance in the single and double evaporator filling amount platform curves as the optimal filling amount of the air conditioner.

[0011] In the above embodiment of the present application, during the alternating charging of the single evaporator and the dual evaporator, the condenser outlet subcooling, the compressor suction and exhaust pressure and the air side performance can be monitored and recorded to accurately obtain the optimal air conditioning charging amount.

[0012] In some embodiments, the oil is added to the filling amount platform in an alternating manner between a single evaporator and a dual evaporator, and the optimal filling amount of the air conditioner is determined based on the drawn single and dual evaporator filling amount platform curves, including: continuously adding a preset mass of refrigerant as the filling amount platform according to the single evaporator; when the data value change is less than a preset threshold after the filling amount platform is filled twice in a row, continuously adding a second preset mass of refrigerant as the filling amount platform according to the dual evaporator, the data values ​​including: condenser outlet subcooling, compressor exhaust pressure and evaporator outlet superheat; when the air conditioner temperature remains unchanged, switching back to the single evaporator mode, and comparing the data value at this time with the data value before the single evaporator mode to obtain a comparison result; judging whether the refrigerant is still in the filling amount platform based on the comparison result; if the refrigerant is in the filling amount platform, continuing to add refrigerant until the air conditioner temperature remains unchanged and then switching to the dual evaporator mode; drawing the single and dual evaporator filling amount platform curves during the cycle according to the above method; selecting the filling amount corresponding to the maximum current data value in the single and dual evaporator filling amount platform curves as the optimal filling amount of the air conditioner.

[0013] In the above embodiment of the present application, during the alternation between the single evaporator mode and the dual evaporator mode, continuously recording the air conditioner charge volume can quickly obtain the single and dual evaporator charge volume platform curves and the optimal charge volume.

[0014] In some embodiments, under rated operating conditions, the opening of the electronic expansion valve is adjusted to adjust the subcooling of the condenser outlet, and the optimal subcooling of the air conditioner is determined based on the drawn air conditioning subcooling performance curve, including: controlling the compressor to the rated speed, speed and speed respectively under rated operating conditions; adjusting the subcooling of the condenser outlet by adjusting the opening of the electronic expansion valve, monitoring and recording the compressor output power and air conditioning refrigeration performance of the air conditioning system to draw the condenser subcooling, air conditioning efficiency and air conditioning performance, and drawing the air conditioning subcooling performance curve; judging the subcooling corresponding to the optimal air conditioning performance coefficient under subcooling as the optimal subcooling.

[0015] In the above embodiment of the present application, the condenser outlet subcooling is adjusted by adjusting the opening of the electronic expansion valve, and the compressor output power and air conditioning refrigeration performance of the air conditioning system are monitored and recorded. The condenser subcooling, air conditioning efficiency, and air conditioning performance are plotted to quickly obtain an air conditioning subcooling performance curve, thereby accurately obtaining the optimal subcooling.

[0016] In some embodiments, under the condition of ensuring the optimal air conditioning filling amount and the optimal air conditioning supercooling degree, the air conditioning circulation oil return rate under different modes is analyzed, including: under the condition of ensuring the optimal air conditioning filling amount and the optimal air conditioning supercooling degree, obtaining multiple data obtained by multiple measuring instruments, the multiple data including: excess pipe volume, ultrasonic oil circulation sensor volume and refrigerant density; under conventional cooling and heating conditions and cooling and heating extreme conditions, the air conditioning circulation oil return rate is analyzed by using the multiple data obtained.

[0017] In the above-mentioned embodiments of the present application, under conventional cooling and heating operating conditions and cooling and heating extreme operating conditions, the air conditioning cycle oil return rate can be accurately analyzed based on a variety of data.

[0018] In some embodiments, after analyzing the air conditioning cycle oil return rate under different modes while ensuring the optimal air conditioning charge amount and the optimal air conditioning subcooling, it also includes: outputting a test report, the test report includes: optimal charge amount, optimal air conditioning subcooling, air conditioning cycle oil return rate, condenser outlet subcooling, compressor suction and exhaust pressure, air side performance, compressor exhaust pressure and evaporator outlet superheat. In the above embodiment of the present application, the air-conditioning related test parameters can be quickly read through the test report.

[0019] In a second aspect, an embodiment of the present application provides a device for testing an air conditioner of a new energy vehicle, comprising: The air conditioning system charge test module is used to add refrigerant to the charge platform in an alternating manner between a single evaporator and a 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 test module is used to adjust the opening of the electronic expansion valve to adjust the condenser outlet subcooling under rated operating conditions, and determine the optimal air conditioning subcooling based on the drawn air conditioning subcooling performance curve; 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 air conditioning charge amount and optimal air conditioning supercooling.

[0020] 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 equipment, a high-precision air-conditioning recovery and filling machine, an automobile air-conditioning system control module and an air-conditioning system data acquisition module.

[0021] Optionally, the air conditioning system charge test module is specifically used to: According to the test conditions, the simulated ambient temperature and humidity inside and outside the vehicle and the condenser inlet wind speed are given, and the compressor speed and air volume are controlled to the preset values; Control the cooling interactive component heating simulation system to the specified heating value; Refill refrigerant into air conditioner through high-precision air conditioner recovery and filling machine; Monitor and record the condenser outlet subcooling, compressor suction and exhaust pressure, and air side performance, and draw the single and double steam charge platform curves for the air conditioning system; The charge amount corresponding to the maximum value of condenser outlet subcooling, compressor suction and exhaust pressure and air side performance in the single and double steam charge amount platform curve is selected as the optimal charge amount of the air conditioner.

[0022] Optionally, the air conditioning system charge test module is specifically used to: Continuously charge the preset quality refrigerant according to the charging volume platform of the individual evaporator; When the data value change of the charging amount platform is less than the preset threshold after two consecutive charging, the second preset mass refrigerant is continuously added according to the dual evaporator as the charging amount platform, and the data values ​​include: condenser outlet subcooling, compressor exhaust pressure and evaporator outlet superheat; When the air-conditioning temperature remains unchanged, switch back to the single evaporator mode, and compare the data value at this time with the data value before the single evaporator mode to obtain a comparison result; Determine whether the refrigerant is still within the charging amount platform based on the comparison results; When the refrigerant is at the charging level, continue to add refrigerant until the air conditioner temperature remains constant before switching to double steam mode; According to the above method, a single and double vapor filling volume platform curve is drawn during the cycle; The charge volume corresponding to the maximum current data value in the single and double steam charge volume platform curve is selected as the optimal charge volume of the air conditioner.

[0023] Optionally, the air conditioning system performance test module is specifically used to: Under rated operating conditions, the compressor is controlled to the rated speed, speed and speed respectively; Adjust the condenser outlet subcooling by adjusting the opening of the electronic expansion valve, monitor and record the compressor output power and air conditioning refrigeration performance of the air conditioning system, plot the condenser subcooling, air conditioning efficiency and air conditioning performance, and draw the air conditioning subcooling performance curve; The subcooling degree corresponding to the optimal coefficient of performance of the air conditioner under the subcooling degree is determined as the optimal subcooling degree.

[0024] Optional, air conditioning system oil circulation test module is specifically used for: Under the conditions of ensuring the optimal air conditioning charge and optimal air conditioning subcooling, a variety of data obtained by various measuring instruments are obtained, including: excess pipe volume, ultrasonic oil circulation sensor volume and refrigerant density; Under normal cooling and heating conditions and cooling and heating extreme conditions, the air conditioning cycle oil return rate is analyzed by obtaining a variety of data.

[0025] Optionally, the device further includes: The output module is used for the air conditioning system oil circulation test module to output a test report after analyzing the air conditioning circulation oil return rate under different modes while ensuring the optimal air conditioning filling amount and the optimal air conditioning subcooling. The test report includes: optimal filling amount, optimal air conditioning subcooling, air conditioning circulation oil return rate, condenser outlet subcooling, compressor suction and exhaust pressure, air side performance, compressor exhaust pressure and evaporator outlet superheat.

[0026] In a third aspect, an embodiment of the present application provides an electronic device comprising a processor and a memory, wherein the memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, the steps in the method provided in the first aspect above are executed.

[0027] In a fourth aspect, an embodiment of the present application provides a readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps in the method provided in the first aspect are executed.

[0028] Other features and advantages of the present application will be described in the subsequent description, and in part will become apparent from the description, or will be understood by practicing the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A flow chart of a method for testing a new energy vehicle air conditioner provided in an embodiment of the present application; Figure 2 A schematic diagram of a structure for testing a new energy vehicle air conditioner provided in an embodiment of the present application; Figure 3 A schematic block diagram of a device for testing a new energy vehicle air conditioner provided in an embodiment of the present application; Figure 4 A schematic block diagram of the structure of a device for testing air conditioners in new energy vehicles provided in an embodiment of the present application; Figure 5 This is a schematic block diagram of the structure of a device for testing new energy vehicle air conditioners provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work fall within the scope of protection of the present application.

[0032] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0033] First, some of the terms involved in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

[0034] A map (or mapping table) is an abstract data structure that stores key-value pairs, allowing for quick lookup of corresponding values ​​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.

[0035] System COP (Coefficient of Performance) is a core parameter for measuring the energy conversion efficiency of a refrigeration system. It is defined as the ratio of the system's heat output to its input energy. It is commonly used in refrigeration systems, heat pump cycles, and renewable energy utilization. Vehicle OCR testing refers to the process of automatically identifying and testing vehicle-related documents and logos using optical character recognition (OCR) technology. OCR technology converts text within images into editable text and is widely used in vehicle inspection and registration processes.

[0036] This application is applied to automotive air conditioning testing scenarios, specifically the air conditioning system charge level test, air conditioning system performance test, and air conditioning system oil circulation test principles and experiments in heat pump air conditioning system tests. Specifically, the optimal COP of the system is determined by testing the subcooling MAP table, completing the optimal performance test of the heat pump air conditioning system with an electronic expansion valve. The OCR test achieves real-time monitoring of the compressor oil flow by installing a sight glass at the compressor suction end. While ensuring visualization of the oil circulation status, the compressor oil flow is accurately measured, significantly improving the test accuracy of the OCR test.

[0037] With the rapid development of China's economy and automotive industry, automotive thermal management technology, as a crucial component of the entire vehicle system, has become a key competitive advantage for major automakers. The rapid development of new energy vehicles has significantly increased the importance of vehicle thermal management systems. Thermal management system testing, as a means of assessing their comprehensive performance, plays an irreplaceable and critical role. New energy vehicle air conditioning systems now integrate not only heat pump technology but also the heat exchange interaction between the vehicle's cooling system and the battery cooling system. Heat pump systems offer significant energy savings and are particularly crucial for improving the range of electric vehicles (EVs) and hybrid electric vehicles (HEVs). They can reduce heating energy consumption by over 50%, significantly extending the range of electric vehicles, particularly in temperatures between 0°C and -15°C. As the technology matures and costs decrease, they are expected to become standard equipment 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 test a single performance. For example, the bench test method involves placing the battery refrigerant direct cooling plate, low-pressure temperature and pressure sensor, electronic expansion valve, and thermostatic heating device in the secondary evaporation chamber of a heat-difference test chamber, with the thermostatic heating device placed below the battery refrigerant direct cooling plate. The air conditioning controller, pressure switch, evaporator, solenoid shutoff valve, and heating, ventilation, and air conditioning assembly are placed in the main evaporation chamber of the heat-difference test chamber. When the subcooling at the condenser assembly outlet and the superheat at the evaporator and battery refrigerant direct cooling plate outlets are stable, 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. This test method only completes performance testing of new energy vehicle cooling and battery cooling modes, does not include system charge and system oil testing, and cannot complete the entire thermal management system test. Furthermore, with the increasing number of thermal management system components in existing new energy vehicles, the air conditioning system requires interaction with an increasing number of vehicle cooling components, making air conditioning system testing incomplete.

[0038] To this end, the present application adds refrigerant to the filling volume platform by alternating between a single evaporator and a double evaporator, and determines the optimal filling volume of the air conditioner based on the plotted single and double evaporator filling volume platform curves; under rated operating conditions, adjusts the electronic expansion valve opening to adjust the condenser outlet subcooling, and determines the optimal air conditioner subcooling based on the plotted air conditioner subcooling performance curve; and analyzes the air conditioner circulation oil return rate under different modes while ensuring the optimal filling volume and optimal air conditioner subcooling. The optimal filling volume can be obtained by performing an air conditioning system filling volume test by alternating between a single evaporator and a double evaporator, and the optimal subcooling can be obtained by performing an air conditioning system performance test by adjusting the condenser outlet subcooling by adjusting the electronic expansion valve opening. The compressor oil flow can be accurately measured by performing an air conditioning system oil circulation test by analyzing the air conditioning circulation oil return rate under different modes, achieving the effect of comprehensively testing the air conditioner of new energy vehicles.

[0039] In the embodiment of the present application, the execution entity can be the test new energy vehicle air-conditioning equipment in the test new energy vehicle air-conditioning system. In actual applications, the test new energy vehicle air-conditioning equipment can be electronic equipment such as terminal equipment and servers, and there is no restriction here.

[0040] The following combination Figure 1 The method for testing the air conditioner of a new energy vehicle in an embodiment of the present application is described in detail.

[0041] Please see Figure 1 , Figure 1 A flow chart of a method for testing a new energy vehicle air conditioner provided in an embodiment of the present application is shown as follows: Figure 1 The methods shown for testing new energy vehicle air conditioners include: Step 110: Refrigerant is added to the charge volume platform in an alternating manner between the single evaporator and the dual evaporator, and the optimal charge volume of the air conditioner is determined based on the drawn single and dual evaporator charge volume platform curves.

[0042] The refrigerant may be refrigerant, or may include refrigeration oil and other refrigerants.

[0043] In some embodiments of the present application, the method is performed through 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 equipment, a high-precision air-conditioning recovery and filling machine, an automobile air-conditioning system control module and an air-conditioning system data acquisition module.

[0044] In the above process, the present application can accurately test the various performances of the air conditioner according to different conditions in all aspects through the cooperation of various hardware and software of the air conditioning system test bench.

[0045] Specifically, the air conditioning system test bench can be Figure 2The air conditioning system test bench schematic diagram is described in detail.

[0046] Please see Figure 2 , Figure 2 A schematic diagram of an air conditioning system test bench provided for this application includes: In-vehicle and out-of-vehicle 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 filling machine, automobile air conditioning system control module and air conditioning system data acquisition module (data acquisition).

[0047] It also includes air conditioning equipment, cooling interactive thermal simulation system, refrigerant filling machine, condenser cabin, high-voltage power supply, control system and equipment operation room.

[0048] Figure 2 The specific implementation process shown can be achieved by Figure 1 The methods and steps shown are not described in detail here.

[0049] In some embodiments of the present application, engine oil is added to the filling amount platform in an alternating manner between a single evaporator and a double evaporator, and the optimal filling amount of the air conditioner is determined based on the drawn single and double evaporator filling amount platform curves, including: providing simulated ambient temperature and humidity inside and outside the vehicle and the condenser inlet wind speed according to the test conditions, and controlling the compressor speed and air volume to preset values; controlling the heating simulation system of the cooling interactive components to a specified heating value; filling the air conditioner with refrigerant through a high-precision air conditioning recovery and filling machine; monitoring and recording the condenser outlet subcooling, compressor suction and exhaust pressure and air side performance, and drawing the single and double evaporator filling amount platform curves of the air conditioning system; selecting the filling amount corresponding to the maximum value of the condenser outlet subcooling, compressor suction and exhaust pressure and air side performance in the single and double evaporator filling amount platform curves as the optimal filling amount of the air conditioner.

[0050] In the above process, the present application can monitor and record the condenser outlet subcooling, compressor suction and exhaust pressure and air side performance during the alternating charging of the single evaporator and the dual evaporator to accurately obtain the optimal air conditioning charging amount.

[0051] The preset value can be set according to requirements.

[0052] For example, before testing, the air conditioning refill volume 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). This refill volume is 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 positioned and collected using a data acquisition module. Based on the test conditions, simulated in-vehicle and outdoor ambient temperature and humidity, as well as condenser inlet air velocity, are applied. The air conditioning system control module controls the compressor speed and HVAC air volume to specified values, and the heat generation simulation system of the cooling interaction components is controlled to a specified heating value. Refrigerant is then added using a high-precision air conditioning recharger. The condenser outlet subcooling, compressor intake and exhaust pressure, and HVAC air-side performance are monitored and recorded to create a platform curve for the air conditioning system refill volume.

[0053] In some embodiments of the present application, oil is added to the filling amount platform in an alternating manner between a single evaporator and a dual evaporator, and the optimal filling amount of the air conditioner is determined based on the drawn single and dual evaporator filling amount platform curves, including: continuously adding a preset mass of refrigerant as the filling amount platform according to the single evaporator; when the data value change is less than a preset threshold after two consecutive fillings on the filling amount platform, continuously adding a second preset mass of refrigerant as the filling amount platform according to the dual evaporator, the data values ​​including: condenser outlet subcooling, compressor exhaust pressure and evaporator outlet superheat; when the air conditioner temperature remains unchanged, switching back to the single evaporator mode, and comparing the data value at this time with the data value before the single evaporator mode to obtain a comparison result; judging whether the refrigerant is still in the filling amount platform based on the comparison result; if the refrigerant is in the filling amount platform, continuing to add refrigerant until the air conditioner temperature remains unchanged and then switching to the dual evaporator mode; drawing the single and dual evaporator filling amount platform curves during the cycle according to the above method; and selecting the filling amount corresponding to the maximum current data value in the single and dual evaporator filling amount platform curves as the optimal filling amount of the air conditioner.

[0054] In the above process, the present application continuously records the air conditioning charge volume during the alternation between the single evaporator mode and the dual evaporator mode, so as to quickly obtain the single and dual evaporator charge volume platform curves and the optimal charge volume.

[0055] The preset quality refrigerant, the preset threshold value and the second preset threshold value can be set according to requirements.

[0056] For example, a new energy vehicle heat pump air conditioning system can use multiple evaporators. The test is performed by first filling a single evaporator, adding 50g each time. After reaching the charging volume platform (the method for determining whether it is on the charging volume platform is to check whether the condenser outlet subcooling, compressor exhaust pressure, and evaporator outlet superheat have no significant changes after two consecutive charging), the amount is added by 25g each time. At this time, the dual evaporator mode is switched, and the refrigerant is continued to be added and waited for stability before switching back to the single evaporator mode. This data is compared with the data before the single-dual evaporation switch to observe whether it is still on the platform. If it is still on the platform, the refrigerant is continued to be added and waited for stability before switching to the dual-evaporation mode to observe whether it enters the platform. Repeat this cycle to measure the single-dual evaporation charging volume platform curve of the air conditioning system.

[0057] Step 120: Under rated operating conditions, adjust the opening of the electronic expansion valve to adjust the condenser outlet subcooling, and determine the optimal air conditioning subcooling based on the drawn air conditioning subcooling performance curve.

[0058] In some embodiments of the present application, under rated operating conditions, the opening of the electronic expansion valve is adjusted to adjust the subcooling of the condenser outlet, and the optimal subcooling of the air conditioner is determined based on the drawn air conditioning subcooling performance curve, including: controlling the compressor to the rated speed, speed and speed respectively under rated operating conditions; adjusting the subcooling of the condenser outlet by adjusting the opening of the electronic expansion valve, monitoring and recording the compressor output power and air conditioning refrigeration performance of the air-conditioning system to draw the condenser subcooling, air conditioning efficiency and air conditioning performance, and drawing the air conditioning subcooling performance curve; judging the subcooling corresponding to the optimal air conditioning performance coefficient under subcooling as the optimal subcooling.

[0059] In the above process, the present application adjusts the condenser outlet subcooling by adjusting the opening of the electronic expansion valve, monitors and records the compressor output power and air conditioning refrigeration performance of the air conditioning system, and plots the condenser subcooling, air conditioning efficiency, and air conditioning performance to quickly obtain an air conditioning subcooling performance curve, thereby accurately obtaining the optimal subcooling.

[0060] Among them, the rated speed, speed and speed can be set according to requirements.

[0061] For example, after determining the optimal air conditioning charge, air conditioning system performance testing is conducted. Prior to system performance testing, the optimal system subcooling calibration is required. Maintaining the air conditioning system test bench, the compressor is controlled to rated speed, maximum speed, and low speed under rated operating conditions. The condenser outlet subcooling is adjusted by adjusting the opening of the electronic expansion valve. The compressor output power and air conditioning refrigeration performance of the air conditioning system are monitored and recorded, and a condenser subcooling curve (sc) / air conditioning efficiency (cop) / air conditioning performance curve is plotted. The optimal subcooling value is determined by using the curve to determine the optimal air conditioning COP under subcooling conditions. Finally, the determined optimal subcooling value is used to conduct air conditioning system performance tests under various operating conditions.

[0062] Step 130: Analyze the air conditioning cycle oil return rate in different modes while ensuring the optimal air conditioning charge amount and the optimal air conditioning supercooling degree.

[0063] Among them, different modes include conventional cooling and heating conditions and cooling and heating extreme conditions.

[0064] In some embodiments of the present application, under the condition of ensuring the optimal air conditioning filling amount and the optimal air conditioning supercooling degree, the air conditioning circulation oil return rate under different modes is analyzed, including: under the condition of ensuring the optimal air conditioning filling amount and the optimal air conditioning supercooling degree, obtaining multiple data obtained by multiple measuring instruments, the multiple data including: excess pipeline volume, ultrasonic oil circulation sensor volume and refrigerant density; under conventional cooling and heating conditions and cooling and heating extreme conditions, the air conditioning circulation oil return rate is analyzed by using the multiple data obtained.

[0065] In the above process, the present application can accurately analyze the air conditioning cycle oil return rate based on a variety of data under conventional cooling and heating conditions and cooling and heating extreme conditions.

[0066] Among them, the various measuring instruments include excess pipe volume measuring instruments, ultrasonic oil circulation sensors and refrigerant density measuring instruments.

[0067] For example, the system oil circulation test needs to be conducted with the optimal charge volume and optimal subcooling level known. Before the test, the air conditioning piping must be cleaned to ensure that no compressor lubricant, other than the factory-installed lubricant, is present in any other air conditioning components. Once these conditions are met, the piping is modified, with an ultrasonic oil circulation rate sensor installed in the system's pure liquid section and an oil level sight glass placed in the compressor's suction section. Finally, based on the optimal system charge volume, excess refrigerant is added to the ultrasonic oil circulation sensor and its modified piping. Excess refrigerant is calculated as (excess refrigerant volume = (excess piping volume + ultrasonic oil circulation sensor volume) × refrigerant density). The system's oil circulation rate is monitored using ultrasonic oil circulation rate testing equipment, and refrigerant return is observed using an oil level sight glass. In addition, a refrigerant lower limit oil circulation test has been added based on the conventional cooling and heating operating conditions (to judge whether the oil circulation and oil return rate of the air-conditioning system under conventional conditions meet the design requirements) and cooling and heating limit operating conditions (to judge whether the oil circulation of the air-conditioning system under the minimum and maximum load conditions of the compressor meets the design requirements). This test is to verify whether the refrigerant leakage in the system to the lower limit of the charge amount will cause damage to the compressor after the air-conditioning system has been running for many years.

[0068] In some embodiments of the present application, after analyzing the air conditioning cycle oil return rate under different modes while ensuring the optimal air conditioning filling amount and the optimal air conditioning supercooling, it also includes: outputting a test report, the test report includes: optimal filling amount, optimal air conditioning supercooling, air conditioning cycle oil return rate, condenser outlet subcooling, compressor suction and exhaust pressure, air side performance, compressor exhaust pressure and evaporator outlet superheat. During the above process, this application can quickly read the air conditioning related test parameters through the test report.

[0069] In the above Figure 1 In the process shown, the present application adds refrigerant to the filling volume platform in an alternating manner using a single evaporator and a dual evaporator, and determines the optimal filling volume of the air conditioner based on the plotted single and dual evaporator filling volume platform curves; under rated operating conditions, adjusts the condenser outlet subcooling by adjusting the opening of the electronic expansion valve, and determines the optimal subcooling of the air conditioner based on the plotted air conditioner subcooling performance curve; and analyzes the air conditioner circulation oil return rate under different modes while ensuring the optimal filling volume and optimal subcooling of the air conditioner. The optimal filling volume can be obtained by performing an air conditioning system filling volume test by alternating using a single evaporator and a dual evaporator, and the optimal subcooling can be obtained by performing an air conditioning system performance test by adjusting the condenser outlet subcooling by adjusting the opening of the electronic expansion valve. The compressor oil flow can be accurately measured by performing an air conditioning system oil circulation test by analyzing the air conditioning circulation oil return rate under different modes, thereby achieving the effect of comprehensively testing the air conditioner of new energy vehicles.

[0070] The following combination Figure 3 The implementation method of testing the air conditioner of a new energy vehicle in an embodiment of the present application is described in detail.

[0071] Please see Figure 3 , Figure 3 A flowchart of an implementation method for testing a new energy vehicle air conditioner provided in an embodiment of the present application is shown as follows: Figure 3 The implementation method for testing new energy vehicle air conditioners shown includes: Step 310: Air conditioning system charge test.

[0072] Specifically: Install the test specimen on the air conditioning system test bench according to the actual vehicle pipeline layout, arrange the TP sensor and connect it to the data acquisition module and set the real-time calculation formula for supercooling and superheating. Use a high-precision recovery and charging machine to pre-fill according to the determined starting point. Set the temperature and wind speed of the environmental chamber and enthalpy difference wind tunnel according to the filling amount working conditions. Generally, the standard refrigeration load is an ambient temperature of 38℃ and a humidity of 50% in both chambers; the standard heat pump load is an ambient temperature of -10℃ and a humidity of 0%; the condenser enthalpy difference wind tunnel inlet air temperature is set according to the condensing chamber; the condenser inlet air speed is 1.67m / s for the standard load; the evaporator enthalpy difference wind tunnel wind speed is set according to the HVAC outlet rated air volume. After all working conditions are stable, start the air conditioning system single steaming mode to start the test. Use a high-precision refrigerant recovery and charging machine to add 50g of refrigerant to the compressor suction section. After the system stabilizes for 30 minutes, record the data (including all TP sensors and the real-time calculated subcooling and superheat values). Then, add another 50g of refrigerant to the system and record the data. Repeat this cycle and observe the data. If the recorded data shows no significant change after two consecutive additions, it indicates that the filling volume has reached the filling volume plateau. Reduce the filling volume to 25g each time. After reaching the filling volume plateau, switch to dual steaming mode, record the data, add 25g of refrigerant, and then switch to single steaming mode. If the data does not change suddenly, switch back to dual steaming mode, record the data, add another 25g of refrigerant, and switch to single steaming mode. Repeat this process until the data shows no change after two consecutive switchings. Continue to use single steaming mode for filling. Wait for single steaming mode to reach the overcharge point (the overcharge point is the data change point). Then reduce the refrigerant charge to 10g and switch to dual steaming mode. Wait until the dual steaming mode also reaches the overcharge point, then add three more 25g of refrigerant and stop filling. Stop the test, plot the charge curve, and mark the plateau and overcharge points for both single- and dual-evaporation modes. Switch the system to heat pump mode and repeat the above steps, plotting the charge curve. Once the charge test is complete, fit the heat pump and cooling mode charge curves to determine the optimal charge for the system (calculated as the system's minimum plateau point + 10-year refrigerant leakage (10g) × number of air conditioning system connectors + 50g factory filler tolerance).

[0073] Step 320: Air conditioning system performance test.

[0074] Specifically: Fill the air conditioning system according to the optimal system charge, arrange the PT sensors, connect them to the data acquisition module, and configure the subcooling and superheat calculation formulas. Set the optimal subcooling calibration conditions for cooling mode, typically 38°C and 50% humidity in the condenser compartment, and 27°C and 35% humidity in the evaporator compartment. After the operating conditions stabilize, start the air conditioning system, control the compressor to rated speed, maximum speed, and low speed, and test the system's COP and cooling performance at subcooling levels of 5°C, 10°C, 15°C, and 20°C. Plot the condenser SC / COP / air conditioning performance curves, and select the subcooling corresponding to the optimal COP as the optimal cooling subcooling value. Set the optimal subcooling calibration conditions for heat pump mode, typically -10°C and 0% humidity in the condenser compartment, and -10°C and 0% humidity in the evaporator compartment. After the operating conditions stabilize, start the air conditioning system, control the compressor to rated speed, and test the system's COP and heating performance at subcooling levels of 5°C, 10°C, 15°C, and 20°C. Draw the condenser SC / COP / air conditioning performance curves and select the subcooling corresponding to the optimal COP to determine the optimal subcooling for the system heat pump. Conduct conventional performance tests on the electronic expansion valve of the refrigeration optimal subcooling control system (typically, rated cooling conditions, high-load cooling conditions, low-load cooling conditions, and water cooling conditions). Conduct conventional performance tests on the electronic expansion valve of the heat pump optimal subcooling control system (typically, frosting conditions, rated heating conditions, high-load heating conditions, and waste heat recovery conditions). Complete the performance test, record each set of test data, and evaluate whether it meets the thermal management performance design requirements.

[0075] Step 330: Air conditioning system oil circulation test.

[0076] Specifically: Complete the cleaning of the system pipes and oiling of the compressor, install the air conditioning system on the test bench, arrange the ultrasonic oil circulation rate sensor and the oil level sight glass (make sure there is no significant rise in the pipe section from the sight glass to the compressor suction port), and add refrigerant. Start the air conditioning system and test it according to the normal oil circulation conditions, which generally include normal cooling and heating conditions and cooling and heating extreme conditions. After waiting for the system to run smoothly under each operating condition, record the system oil circulation value and the status of the oil return sight glass. Determine whether the oil circulation meets the requirements based on the test oil circulation rate value, and determine its oil return level based on the oil level status in the sight glass. The oil return level is divided into LV1: no oil return in the entire area; LV2: less 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 in the entire area. The oil return level can be determined to be qualified when it reaches LV3. After completing the conventional oil circulation test, clean the air conditioning system again and refill it with oil to perform the refrigerant lower limit test. Fill the system according to the minimum charge volume (referring to the system's minimum starting point, without additional refrigerant for leakage and factory tolerance) as described in the charge volume test. Then, retest the system according to the standard oil circulation test described above. Evaluate the test results according to the evaluation method in step C. This completes the oil circulation test.

[0077] also, Figure 3 The specific methods and steps shown can be found in Figure 1 The method shown here will not be described in detail.

[0078] Previous article passed Figure 1 、 Figure 3 Describes the method of testing the air conditioner of new energy vehicles. Figure 4-Figure 5 Describe the device for testing the air conditioner of new energy vehicles.

[0079] Please refer to Figure 4 , is a schematic block diagram of a device 400 for testing a new energy vehicle air conditioner provided in an embodiment of the present application. The device 400 may be a module, program segment or code on an electronic device. The device 400 is similar to the above Figure 1 The method embodiment corresponds to the embodiment that 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 description below. To avoid repetition, detailed description is appropriately omitted here.

[0080] Optionally, the device 400 includes: The air conditioning system charge level test module 410 is used to add refrigerant to the charge level platform in an alternating manner between a single evaporator and a dual evaporator, and determine the optimal air conditioning charge level based on the plotted single and dual evaporator charge level platform curves; The air conditioning system performance test module 420 is used to adjust the opening of the electronic expansion valve to adjust the condenser outlet subcooling under rated operating conditions, and determine the optimal air conditioning subcooling based on the drawn air conditioning subcooling performance curve; The air conditioning system oil circulation test module 430 is used to analyze the air conditioning circulation oil return rate in different modes while ensuring the optimal air conditioning charge amount and the optimal air conditioning supercooling degree.

[0081] 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 equipment, a high-precision air-conditioning recovery and filling machine, an automobile air-conditioning system control module and an air-conditioning system data acquisition module.

[0082] Optionally, the air conditioning system charge test module is specifically used to: According to the test conditions, the simulated ambient temperature and humidity inside and outside the vehicle and the condenser inlet wind speed are given, and the compressor speed and air volume are controlled to the preset values; the cooling interactive component heat simulation system is controlled to the specified heat value; the air conditioner is filled with refrigerant through a high-precision air-conditioning recovery and filling machine; the condenser outlet subcooling, compressor suction and exhaust pressure and air side performance are monitored and recorded, and the single and double steam charging amount platform curves of the air-conditioning system are drawn; the charging amount corresponding to the maximum value of the condenser outlet subcooling, compressor suction and exhaust pressure and air side performance in the single and double steam charging amount platform curves is selected as the optimal charging amount of the air conditioner.

[0083] Optionally, the air conditioning system charge test module is specifically used to: Continuously add refrigerant of preset quality according to the single evaporator as the filling amount platform; when the data value change is less than the preset threshold value after two consecutive fillings on the filling amount platform, continuously add refrigerant of the second preset quality according to the dual evaporator as the filling amount platform, and the data values ​​include: condenser outlet subcooling, compressor exhaust pressure and evaporator outlet superheat; when the air-conditioning temperature remains unchanged, switch back to the single evaporator mode, and compare the data value at this time with the data value before the single evaporator mode to obtain a comparison result; judge whether the refrigerant is still in the filling amount platform according to the comparison result; if the refrigerant is in the filling amount platform, continue to add refrigerant until the air-conditioning temperature remains unchanged and then switch to the dual evaporation mode; draw the single and dual evaporation filling amount platform curve during the cycle according to the above method; select the filling amount corresponding to the maximum current data value in the single and dual evaporation filling amount platform curve as the optimal filling amount of the air conditioner.

[0084] Optionally, the air conditioning system performance test module is specifically used to: Under rated operating conditions, the compressor is controlled to the rated speed, speed and speed respectively; the condenser outlet subcooling is adjusted by adjusting the opening of the electronic expansion valve, the compressor output power and air conditioning refrigeration performance of the air-conditioning system are monitored and recorded, the condenser subcooling, air-conditioning efficiency and air-conditioning performance are plotted, and the air-conditioning subcooling performance curve is plotted; the subcooling corresponding to the best air-conditioning performance coefficient under subcooling is determined as the optimal subcooling.

[0085] Optional, air conditioning system oil circulation test module is specifically used for: While ensuring the optimal air conditioning charge volume and optimal air conditioning supercooling, various data obtained by various measuring instruments are obtained, including: excess pipe volume, ultrasonic oil circulation sensor volume and refrigerant density; under conventional cooling and heating conditions and cooling and heating extreme conditions, the air conditioning circulation oil return rate is analyzed through the various data obtained.

[0086] Optionally, the device further includes: The output module is used for the air conditioning system oil circulation test module to output a test report after analyzing the air conditioning circulation oil return rate under different modes while ensuring the optimal air conditioning filling amount and the optimal air conditioning subcooling. The test report includes: optimal filling amount, optimal air conditioning subcooling, air conditioning circulation oil return rate, condenser outlet subcooling, compressor suction and exhaust pressure, air side performance, compressor exhaust pressure and evaporator outlet superheat.

[0087] Please refer to Figure 5 This is a schematic block diagram of the structure of a device for testing a new energy vehicle air conditioner provided in an embodiment of the present application. The device may include a memory 510 and a processor 520. Optionally, the device may also include: a communication interface 530 and a communication bus 540. The device is similar to the above Figure 1 The method embodiment corresponds to the embodiment that can be executed Figure 1 The various steps involved in the method embodiment and the specific functions of the device can be found in the description below.

[0088] Specifically, the memory 510 is used to store computer-readable instructions.

[0089] Processor 520 is used to process the readable instructions stored in the memory and execute Figure 1 The steps in the method.

[0090] The communication interface 530 is used for signaling or data communication with other node devices, for example, for communication with a server or terminal, or for communication with other device nodes, but the embodiments of the present application are not limited thereto.

[0091] The communication bus 540 is used to realize direct connection and communication among the above components.

[0092] Among them, the communication interface 530 of the device in the embodiment of the present application is used to communicate signaling or data with other node devices. The memory 510 can be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 510 can also be at least one storage device located away from the aforementioned processor. The memory 510 stores computer-readable instructions. When the computer-readable instructions are executed by the processor 520, the electronic device executes the above-mentioned Figure 1 The method process shown. The processor 520 can be used on the device 400 and is used to perform the functions of the present application. For example, the above-mentioned processor 520 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, but the embodiments of the present application are not limited thereto.

[0093] The embodiment of the present application further provides a readable storage medium, wherein when the computer program is executed by a processor, Figure 1 The method process in the illustrated method embodiment is performed by the electronic device.

[0094] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working process of the device described above can refer to the corresponding process in the aforementioned method, and will not be described in detail here.

[0095] In summary, the embodiments of the present application provide a method, apparatus, device, and storage medium for testing new energy vehicle air conditioners. The method includes: filling a charge volume platform with refrigerant in alternating single and dual evaporator configurations, and determining the optimal air conditioner charge volume based on plotted single and dual evaporator charge volume platform curves; adjusting the condenser outlet subcooling by adjusting the opening of the electronic expansion valve under rated operating conditions, and determining the optimal air conditioner subcooling based on plotted air conditioner subcooling performance curves; and analyzing the air conditioner circulation oil return rate under different modes while ensuring the optimal air conditioner charge volume and optimal air conditioner subcooling. This method can achieve comprehensive testing of new energy vehicle air conditioners.

[0096] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions and operations of the devices, methods and computer program products according to the multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, program segment or a part of the code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or can be implemented using a combination of dedicated hardware and computer instructions.

[0097] In addition, the functional modules in each embodiment of the present 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.

[0098] If the functions are implemented in the form of software function 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 the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks.

[0099] The foregoing is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures.

[0100] The above is only a specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed in this application, which should be covered by the scope of protection of the present application.

[0101] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

Claims

1. A method for testing a new energy vehicle air conditioner, characterized in that: include: Refrigerant is added to the charge volume platform in an alternating manner between single evaporator and double evaporator, and the optimal charge volume of the air conditioner is determined based on the plotted single and double evaporator charge volume platform curves; Under rated working conditions, adjust the opening of the electronic expansion valve to adjust the subcooling degree of the condenser outlet, and determine the optimal subcooling degree of the air conditioner based on the drawn air conditioner subcooling performance curve; Under the condition of ensuring the optimal charging amount and the optimal supercooling degree of the air conditioner, the air conditioner circulation oil return rate under different modes is analyzed.

2. The method according to claim 1, characterized in that The method is performed through 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 filling machine, an automobile 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 method of filling the filling amount platform with engine oil in an alternating manner of the single evaporator and the double evaporator, and determining the optimal filling amount of the air conditioner based on the drawn single and double evaporator filling amount platform curves, includes: According to the test conditions, the simulated ambient temperature and humidity inside and outside the vehicle and the condenser inlet wind speed are given, and the compressor speed and air volume are controlled to the preset values; Control the cooling interactive component heating simulation system to the specified heating value; Refill refrigerant into air conditioner through high-precision air conditioner recovery and filling machine; Monitor and record the condenser outlet subcooling, compressor suction and exhaust pressure, and air side performance, and draw the single and double steam charge platform curves for the air conditioning system; The charge amount corresponding to the maximum values ​​of the condenser outlet subcooling, compressor suction and exhaust pressure, and air side performance in the single and double steam charge amount platform curve is selected as the optimal charge amount of the air conditioner.

4. The method according to claim 1 or 2, characterized in that The method of filling the filling amount platform with engine oil in an alternating manner of the single evaporator and the double evaporator, and determining the optimal filling amount of the air conditioner based on the drawn single and double evaporator filling amount platform curves, includes: Continuously charging the preset mass of refrigerant according to the said individual evaporator as the charging quantity platform; When the data value change of the filling amount platform is less than a preset threshold after two consecutive fillings, the second preset mass refrigerant is continuously added according to the dual evaporator as the filling amount platform, and the data values ​​include: condenser outlet subcooling, compressor exhaust pressure and evaporator outlet superheat; When the air-conditioning temperature remains unchanged, the single evaporator mode is switched back to the single evaporator mode, and the data value at this time is compared with the data value before the single evaporator mode to obtain a comparison result; determining whether the refrigerant is still in the charging amount platform according to the comparison result; The refrigerant is in the charging amount platform, and the refrigerant is continuously added until the air conditioner temperature remains constant and then switched to the double steam mode; According to the above method, the single and double vapor filling amount platform curves are drawn during the cycle; The charging amount corresponding to the maximum current data value in the single- and double-evaporation charging amount platform curve is selected as the optimal charging amount of the air conditioner.

5. The method according to claim 1 or 2, characterized in that Under the rated operating conditions, adjusting the opening of the electronic expansion valve to adjust the condenser outlet subcooling, and determining the optimal air conditioning subcooling according to the drawn air conditioning subcooling performance curve, includes: Under rated operating conditions, the compressor is controlled to the rated speed, speed and speed respectively; Regulating the condenser outlet subcooling by adjusting the opening of the electronic expansion valve, monitoring and recording the compressor output power and air conditioning refrigeration performance of the air conditioning system, plotting the condenser subcooling, air conditioning efficiency and air conditioning performance, and plotting the air conditioning subcooling performance curve; The subcooling degree corresponding to when the air conditioning performance coefficient is optimal under the subcooling degree is determined as the optimal subcooling degree.

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

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

8. A device for testing new energy vehicle air conditioners, characterized in that: include: The air conditioning system charge test module is used to add refrigerant to the charge platform in an alternating manner between a single evaporator and a 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 test module is used to adjust the opening of the electronic expansion valve to adjust the condenser outlet subcooling under rated operating conditions, and determine the optimal air conditioning subcooling based on the drawn air conditioning subcooling performance curve; 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 air conditioning filling amount and the optimal air conditioning supercooling degree.

9. An electronic device, characterized in that: include: A memory and a processor, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the steps of the method according to any one of claims 1 to 7 are executed.

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

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