A Low-Temperature Reliability Test Method and Device for a Vehicle Heat Pump Air Conditioner

Abstract

The present invention provides a method and device for testing the low-temperature reliability of a vehicle heat pump air conditioner. By controlling the vehicle to drive at different ambient temperatures and collecting the temperature changes inside the vehicle during each driving process of the vehicle, the temperature control effect of the vehicle heat pump air conditioner is obtained, and the low-temperature reliability of the heat pump air conditioner of the vehicle is judged, and the detection result of the low-temperature reliability of the vehicle heat pump air conditioner is obtained simply and effectively.

Description

Technical Field

[0001] The present invention relates to the field of vehicle air conditioner testing, and particularly to a method and device for low-temperature reliability testing of a vehicle heat pump air conditioner. Background Art

[0002] A heat pump air conditioner is an air conditioning system that can transfer the heat energy of a low-temperature heat source to a high temperature. By using a four-way reversing valve, the functions of the evaporator and condenser of the heat pump air conditioner can be interchanged with each other, changing the direction of heat transfer, so as to achieve the effect of cooling in summer and heating in winter.

[0003] Under the same working conditions, the heating energy consumption of the heat pump air conditioner system is about 50% of the heating energy consumption of the PTC. Therefore, the heat pump air conditioner technology is one of the important solutions to the pain point problem that the low-temperature cruising range of pure electric vehicles is significantly reduced. With the rapid development of new energy vehicles, the heat pump air conditioner has gradually realized its development potential and become a common configuration of mainstream pure electric vehicle models in the domestic and international markets.

[0004] However, there are also certain limitations in the low-temperature heating working condition of the heat pump air conditioner: one is that due to the low outdoor temperature, frosting is likely to occur on the surface of the evaporator, thus affecting the heating effect; the other is that the reduction of the outdoor temperature will increase the indoor heat load, and the heating capacity of the air conditioner continues to decrease, unable to meet the actual needs of users. Therefore, how to match and optimize the vehicle heat pump air conditioner system to reduce frosting is one of the design key points of pure electric vehicles equipped with heat pump air conditioners; how to verify the low-temperature working reliability of the heat pump air conditioner is one of the key verification works of the vehicle air conditioner.

[0005] At present, there is no relatively mature and unified test verification method for the low-temperature reliability of automotive heat pump air conditioners in the industry. Generally, during low-temperature calibration tests, the operating state and speed of the compressor are observed to determine whether the heat pump system is working properly. This method has a single temperature working condition and can only judge the working state of the compressor of the heat pump air conditioner system, and cannot rule out faults or functional deficiencies of other components of the air conditioner system. Summary of the Invention

[0006] The present invention provides a method and device for low-temperature reliability testing of a vehicle heat pump air conditioner, and simply and effectively obtains the detection result of the low-temperature reliability of the heat pump air conditioner of the vehicle.

[0007] To achieve the above object, the present invention provides a method for low-temperature reliability testing of a vehicle heat pump air conditioner, including:

[0008] Controlling the vehicle to perform several cyclic drives at several preset different ambient temperatures respectively according to a preset test cycle working condition;

[0009] During each cycle of the vehicle's driving, the temperature of a number of preset test points inside the vehicle and the time corresponding to the temperature are collected in real time;

[0010] After each cycle of driving ends, the average value of the temperatures of the number of test points at the same time is obtained, and the first duration of the average value within a preset temperature threshold and the second duration from when the average value first reaches the temperature threshold to when the vehicle stops cycling are calculated;

[0011] Based on the first duration and the second duration corresponding to each cycle of driving, a number of effective temperature control duration ratios of the vehicle's heat pump air conditioner at different ambient temperatures are obtained;

[0012] Based on the obtained number of effective temperature control duration ratios, the test results of the low-temperature reliability of the vehicle's heat pump air conditioner are obtained.

[0013] The present invention provides a method for testing the low-temperature reliability of a vehicle's heat pump air conditioner. According to a preset test cycle condition and preset different ambient temperatures, the vehicle is controlled to cycle and drive so that the test conforms to the actual driving situation of the vehicle, improving the authenticity and accuracy of the test method. By setting different ambient temperatures, it is ensured that the vehicle's heat pump air conditioner is tested under different low-temperature environments, improving the comprehensiveness of the test method. During the test process, by collecting the temperatures of a number of different test points inside the vehicle and the time corresponding to the temperature, the temperature data and time data provide an intuitive basis for subsequent evaluation of the heat pump air conditioner, reducing the complexity of the test method. Then, based on the obtained temperature data and duration data, the first duration and the second duration that meet the evaluation conditions are judged and selected. Based on the first duration and the second duration, the effective temperature control duration ratio of the vehicle's heat pump air conditioner is obtained. By comparing the effective temperature control duration ratio with a preset temperature control duration ratio threshold, the test results of the low-temperature reliability of the vehicle's heat pump air conditioner are simply and directly obtained. Through the temperatures and time data of different test points, the comprehensive and effective temperature control degree of the heat pump air conditioner on the vehicle's temperature is obtained. Based on the temperature and time data inside the vehicle, the test results of the low-temperature reliability of the heat pump air conditioner are simply and effectively obtained.

[0014] As a preferred example, before controlling the vehicle to perform a number of cycles of driving at a number of preset different ambient temperatures, it specifically includes:

[0015] By activating various function switches of the heat pump air conditioner, it is judged whether the functions of each component of the heat pump air conditioner are normal;

[0016] By adjusting the cooling or heating temperature of the heat pump air conditioner, determine whether the compressor and temperature adjustment functions of the heat pump air conditioner are normal;

[0017] By adjusting the wind speed of the heat pump air conditioner, determine whether the wind speed adjustment function of the heat pump air conditioner is normal;

[0018] Start the internal circulation or external circulation function of the heat pump air conditioner, and by observing whether there is a corresponding internal circulation or external circulation logo on the vehicle screen, determine whether the internal circulation or external circulation function of the vehicle is normal;

[0019] Start the heat pump air conditioner of the vehicle and adjust the temperature of the heat pump air conditioner to reach the preset temperature standard.

[0020] Before evaluating the low-temperature reliability of the heat pump air conditioner, the present invention first checks various functions of the heat pump air conditioner to ensure that the test method is based on the normal operation of the heat pump air conditioner, eliminates various factors that affect the heating of the heat pump air conditioner, ensures the accuracy of the test method, and then starts the heat pump air conditioner of the vehicle and adjusts it to the preset temperature standard for testing.

[0021] As a preferred example, according to the preset test cycle conditions, control the vehicle to perform cyclic driving at several different preset ambient temperatures, specifically including:

[0022] According to different driving environments and the driving requirements of the vehicle, determine CLTC-P as the preset test cycle condition;

[0023] Combined with the low-temperature conditions in different regions and the working temperature range of the heat pump air conditioner, formulate several different temperature environments for the vehicle to perform cyclic driving;

[0024] According to the driving duration requirement of the vehicle and the working efficiency of the heat pump air conditioner, determine the number of cycles for each cyclic driving of the vehicle.

[0025] Based on the actual driving situation of the vehicle and the low-temperature environment in different regions, the present invention selects CLTC-P in the working conditions as the test cycle condition, and at the same time formulates various different ambient temperatures, controls the vehicle to perform cyclic driving, and at the same time formulates the number of cycles for each test of the vehicle, so as to ensure that the heat pump air conditioner can work fully, ensuring the reliability and authenticity of the test method.

[0026] As a preferred example, during the real-time acquisition of the vehicle during each cyclic driving process, the temperatures of several preset test points inside the vehicle and the corresponding time of the temperatures are specifically included:

[0027] By means of a plurality of temperature sensors arranged at the plurality of test points, the temperature of a plurality of test points inside the vehicle is collected in real time according to a preset time period, and the temperature of a plurality of preset test points inside the vehicle and the corresponding time of the temperature are obtained.

[0028] The plurality of test points include the head of the driver's seat, the feet of the driver's seat, the air outlet of the driver's seat, the head of the co-driver's seat, the feet of the co-driver's seat, and the air outlet of the feet of the co-driver's seat.

[0029] In the present invention, the temperature data of different positions inside the vehicle and the corresponding time of each temperature data are obtained through a plurality of temperature sensors arranged inside the vehicle, and the degree of temperature influence on the inside of the vehicle caused by the heat pump air conditioner after operation is simply and directly obtained. At the same time, different positions inside the vehicle are respectively the head of the driver's seat, the feet of the driver's seat, the air outlet of the driver's seat, the head of the co-driver's seat, the feet of the co-driver's seat, and the air outlet of the feet of the co-driver's seat. The positions cover all aspects inside the vehicle, ensuring the effectiveness of the test method.

[0030] As a preferred example, when obtaining the average value of the temperatures of the plurality of test points at the same time, and calculating the first duration of the average value within a preset temperature threshold and the second duration from when the average value first reaches the temperature threshold to when the vehicle stops circulating and driving, specifically includes:

[0031] According to the temperatures collected by the plurality of temperature sensors and the preset time period, the first temperature duration before the average value of the temperature of the head of the driver's seat and the head of the co-driver's seat first reaches the temperature threshold from when the vehicle starts to start and the first duration of the average value within the temperature threshold range are obtained.

[0032] According to the preset test cycle condition and the number of cycles, the first driving duration of each cycle of driving of the vehicle is obtained.

[0033] According to the first temperature duration and the first driving duration, the second duration from when the average value of the temperature of the head of the driver's seat and the head of the co-driver's seat is within the temperature threshold to when the vehicle stops circulating and driving is obtained.

[0034] In the present invention, the temperature sensors arranged at the plurality of test points directly feedback temperature data and time data. According to the temperature data and time data, the first duration between effective temperature data inside the vehicle and the second duration from when the heat pump air conditioner starts to work to when the inside of the vehicle is within the effective temperature threshold range are calculated, providing data for evaluation simply and clearly.

[0035] As a preferred example, obtaining a plurality of effective temperature control duration ratios of the vehicle heat pump air conditioner at different ambient temperatures according to the first duration and the second duration corresponding to each cyclic driving specifically includes:

[0036] According to each cyclic driving of the vehicle, by calculating the duration ratio of the first duration occupying the second duration, a plurality of effective temperature control duration ratios of the heat pump air conditioner of the vehicle at different ambient temperatures are obtained.

[0037] The present invention obtains the effective temperature control duration ratio through the first duration and the second duration, proving the simplicity and effectiveness of the test method.

[0038] As a preferred example, obtaining the test result of the low-temperature reliability of the vehicle heat pump air conditioner according to the obtained plurality of effective temperature control duration ratios specifically includes:

[0039] By conducting tests at different ambient temperatures, a plurality of effective temperature control duration ratios of the heat pump air conditioner at different ambient temperatures are obtained;

[0040] Calculate the average value of the two effective temperature control duration ratios with the largest numerical values among the obtained plurality of effective temperature control duration ratios, and confirm the temperature control duration ratio threshold according to the average value;

[0041] After excluding the first effective temperature control duration ratio and the second effective temperature control duration ratio, compare the remaining plurality of effective temperature control duration ratios with the temperature control duration ratio threshold to determine whether all the remaining plurality of effective temperature control duration ratios are greater than the temperature control duration ratio threshold;

[0042] If so, the heat pump air conditioner of the vehicle has low-temperature reliability;

[0043] If not, the heat pump air conditioner of the vehicle does not have low-temperature reliability.

[0044] The present invention compares the preset temperature control duration ratio threshold with the obtained effective temperature control duration ratio, and obtains the evaluation result through a simple numerical ratio, and the whole test method is simple and effective.

[0045] On the other hand, the present invention provides a test device for the low-temperature reliability of a vehicle heat pump air conditioner, including: a cyclic driving module, a collection module, a duration module, a calculation module, and an evaluation module;

[0046] The cyclic driving module is configured to control the vehicle to perform a plurality of cyclic drivings at a plurality of preset different ambient temperatures respectively according to a preset test cycle condition;

[0047] The acquisition module is used to collect the temperature of a number of preset test points inside the vehicle and the corresponding time during each cyclic driving process of the vehicle in real time;

[0048] The duration module is used to, after each cyclic driving ends, obtain the average value of the temperatures of the number of test points at the same time, and calculate the first duration of the average value within a preset temperature threshold and the second duration from when the average value first reaches the temperature threshold to when the vehicle stops cyclic driving;

[0049] The calculation module is used to obtain a number of effective temperature control duration ratios of the vehicle heat pump air conditioner at different ambient temperatures according to the first duration and the second duration corresponding to each cyclic driving;

[0050] The evaluation module is used to compare the obtained number of effective temperature control duration ratios with a preset temperature control duration ratio threshold respectively to obtain the test result of the low-temperature reliability of the heat pump air conditioner of the vehicle.

[0051] The present invention provides a test device for the low-temperature reliability of a vehicle heat pump air conditioner. The cyclic driving module controls the vehicle to cyclic drive according to a preset test cyclic working condition and preset different ambient temperatures, so that the test fits the actual driving situation of the vehicle, improves the authenticity and accuracy of the test method. By setting different ambient temperatures, it ensures that the heat pump air conditioner of the vehicle is tested under different low-temperature environments, improving the comprehensiveness of the test method. During the test process, the acquisition module collects the temperatures of a number of different test points inside the vehicle and the corresponding time. The temperature data and time data provide an intuitive basis for subsequent evaluation of the heat pump air conditioner, reducing the complexity of the test method. Then, according to the duration module, the first duration and the second duration that meet the evaluation conditions are obtained by judging and screening through the obtained temperature data and duration data. The calculation module obtains the effective temperature control duration ratio of the heat pump air conditioner of the vehicle according to the first duration and the second duration. The evaluation module simply and directly obtains the test result of the low-temperature reliability of the heat pump air conditioner of the vehicle by comparing the effective temperature control duration ratio with a preset temperature control duration ratio threshold. Through the temperatures and time data of different test points, the overall and effective temperature control degree of the heat pump air conditioner on the temperature of the vehicle is obtained. According to the temperature and time data inside the vehicle, the test result of the low-temperature reliability of the heat pump air conditioner is simply and effectively obtained.

[0052] As a preferred example, in the duration module, it includes a first duration unit and a second duration unit;

[0053] The first duration unit is configured to obtain a first temperature duration before the average value of the head temperatures of the driver's seat and the co-driver's seat first reaches a temperature threshold from the start of the vehicle startup according to the temperatures collected by the plurality of temperature sensors and the preset time period, and a first duration during which the average value is within the temperature threshold range;

[0054] The second duration unit is configured to obtain a first driving duration for each cycle of the vehicle according to the preset test cycle conditions and the number of cycles; and obtain a second duration from when the average value of the head temperatures of the driver's seat and the co-driver's seat is within the temperature threshold to the stop of the vehicle cycle driving according to the first temperature duration and the first driving duration.

[0055] The present invention, through the first duration unit and the second duration unit, directly feeds back temperature data and time data according to the temperature sensors arranged at the plurality of test points, and calculates a first duration between valid temperature data inside the vehicle according to the temperature data and time data, and a second duration from when the heat pump air conditioner starts to work until the inside of the vehicle is within the valid temperature threshold range, providing data for evaluation in a simple and clear manner.

[0056] As a preferred example, the evaluation module includes a statistics unit, a confirmation unit, and an evaluation unit;

[0057] The statistics unit is configured to obtain a plurality of valid temperature control duration ratios of the heat pump air conditioner at different ambient temperatures by conducting tests at different ambient temperatures;

[0058] The confirmation unit is configured to obtain an average value of the two valid temperature control duration ratios with the largest values among the obtained plurality of valid temperature control duration ratios, and confirm a temperature control duration ratio threshold according to the average value;

[0059] The evaluation unit is configured to compare the remaining plurality of valid temperature control duration ratios obtained after excluding the first valid temperature control duration ratio and the second valid temperature control duration ratio with the temperature control duration ratio threshold, and determine whether all of the remaining plurality of valid temperature control duration ratios are greater than the temperature control duration ratio threshold; if so, the heat pump air conditioner of the vehicle has low-temperature reliability; if not, the heat pump air conditioner of the vehicle does not have low-temperature reliability.

[0060] The present invention obtains a number of effective temperature control duration ratios obtained after the vehicle is tested at different ambient temperatures through a statistical unit. The ambient temperatures are tested in descending order. Then, through a confirmation unit, two with the largest ratio values are selected from the obtained number of effective temperature control duration ratios, and then the average value of the two largest ratio values is calculated. The ratio threshold is obtained by calculating the average value according to a certain ratio. Then, the remaining number of effective temperature control duration ratios are respectively compared with the ratio threshold to evaluate the low-temperature reliability of the heat pump air conditioner of the vehicle. If all the remaining number of effective temperature control duration ratios are greater than the ratio threshold, the heat pump air conditioner of the vehicle has low-temperature reliability. If there is one effective temperature control duration ratio less than the ratio threshold, the heat pump air conditioner of the vehicle does not have low-temperature reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 : is a schematic flow chart of a method for testing the low-temperature reliability of a vehicle heat pump air conditioner provided by an embodiment of the present invention;

[0062] Figure 2 : is a schematic structural diagram of a device for testing the low-temperature reliability of a vehicle heat pump air conditioner provided by an embodiment of the present invention;

[0063] Figure 3 : is a schematic flow chart of a method for testing the low-temperature reliability of a vehicle heat pump air conditioner provided by another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0064] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0065] Embodiment 1

[0066] Please refer to Figure 1 , which is a schematic flow chart of a method for testing the low-temperature reliability of a vehicle heat pump air conditioner provided by an embodiment of the present invention, and mainly includes steps 101 to 105, specifically including:

[0067] Step 101: Control the vehicle to perform several cyclic runs at several preset different ambient temperatures according to a preset test cycle condition.

[0068] Before performing this step, by activating various function switches of the heat pump air conditioner, determine whether the functions of each component of the heat pump air conditioner are normal; by adjusting the cooling or heating temperature of the heat pump air conditioner, determine whether the compressor and temperature adjustment functions of the heat pump air conditioner are normal; by adjusting the air volume of the heat pump air conditioner, determine whether the air volume adjustment function of the heat pump air conditioner is normal; activate the internal or external circulation function of the heat pump air conditioner, and by observing whether there is a corresponding internal or external circulation indicator on the vehicle screen, determine whether the internal or external circulation function of the vehicle is normal; start the heat pump air conditioner of the vehicle and adjust the temperature of the heat pump air conditioner to reach the preset temperature standard.

[0069] In this embodiment, this step specifically includes: determining the CLTC-P in the working conditions as the preset test cycle working condition according to different driving environments and the driving requirements of the vehicle; combining the low temperature conditions in different regions and the working temperature range of the heat pump air conditioner, formulating several different temperature environments for the vehicle to perform cyclic driving; determining the number of cycles for each cyclic driving of the vehicle according to the driving duration requirement of the vehicle and the working efficiency of the heat pump air conditioner.

[0070] Step 102: During each cyclic driving of the vehicle, collect in real time the temperatures of several preset test points inside the vehicle and the time corresponding to the temperatures.

[0071] In this embodiment, this step specifically includes: through several temperature sensors arranged at the several test points, collect in real time the temperatures of several test points inside the vehicle according to a preset time period, and obtain the temperatures of several preset test points inside the vehicle and the time corresponding to the temperatures; the several test points include the head of the driver's seat, the feet of the driver's seat, the air outlet of the driver's seat, the head of the passenger seat, the feet of the passenger seat, and the air outlet of the feet of the passenger seat.

[0072] After each cyclic driving ends, calculate the average value of the temperatures of the several test points at the same time, and calculate the first duration of the average value within a preset temperature threshold and the second duration from the first time the average value reaches the temperature threshold to the vehicle stopping cyclic driving.

[0073] In this embodiment, this step specifically includes: obtaining a first temperature duration before the average value of the head temperature of the driver's seat and the head temperature of the co-driver's seat first reaches the temperature threshold from the start of the vehicle startup according to the temperatures collected by the plurality of temperature sensors and the preset time period, and a first duration when the average value is within the temperature threshold range; obtaining a first driving duration for each cyclic driving of the vehicle according to the preset test cycle conditions and the number of cycles; and obtaining a second duration from when the average value of the head temperature of the driver's seat and the head temperature of the co-driver's seat is within the temperature threshold to the stop of the cyclic driving of the vehicle according to the first temperature duration and the first driving duration.

[0074] Step 104: Obtain a plurality of effective temperature control duration ratios of the vehicle heat pump air conditioner at different ambient temperatures according to the first duration corresponding to each cyclic driving and the second duration.

[0075] In this embodiment, this step specifically includes: for each cyclic driving of the vehicle, obtaining a plurality of effective temperature control duration ratios of the heat pump air conditioner of the vehicle at different ambient temperatures by calculating the duration ratio of the first duration to the second duration.

[0076] Step 105: Obtain the test result of the low-temperature reliability of the vehicle heat pump air conditioner according to the obtained plurality of effective temperature control duration ratios.

[0077] In this embodiment, this step specifically includes: obtaining a plurality of effective temperature control duration ratios of the heat pump air conditioner at different ambient temperatures through tests at different ambient temperatures; obtaining the average value of the two effective temperature control duration ratios with the largest values among the obtained plurality of effective temperature control duration ratios, and determining the temperature control duration ratio threshold according to the average value; comparing the remaining plurality of effective temperature control duration ratios obtained after excluding the first effective temperature control duration ratio and the second effective temperature control duration ratio with the temperature control duration ratio threshold to determine whether all the remaining plurality of effective temperature control duration ratios are greater than the temperature control duration ratio threshold; if so, the heat pump air conditioner of the vehicle has low-temperature reliability; if not, the heat pump air conditioner of the vehicle does not have low-temperature reliability.

[0078] Please refer to Figure 2 , a vehicle heat pump air conditioner low-temperature reliability test device provided by an embodiment of the present invention, includes a cyclic driving module 201, a collection module 202, a duration module 203, a calculation module 204, and an evaluation module 205.

[0079] The cyclic driving module 201 is configured to control the vehicle to perform several cyclic drives at several preset different ambient temperatures respectively according to a preset test cycle condition;

[0080] The acquisition module 202 is configured to collect in real time the temperatures of several preset test points inside the vehicle and the corresponding times during each cyclic drive of the vehicle;

[0081] The duration module 203 is configured to, after each cyclic drive ends, obtain the average value of the temperatures of the several test points at the same time, and calculate the first duration of the average value within a preset temperature threshold and the second duration from when the average value first reaches the temperature threshold to when the vehicle stops cyclic driving;

[0082] The calculation module 204 is configured to obtain several effective temperature control duration ratios of the vehicle heat pump air conditioner at different ambient temperatures according to the first duration and the second duration corresponding to each cyclic drive;

[0083] The evaluation module 205 is configured to obtain the test result of the low-temperature reliability of the heat pump air conditioner of the vehicle according to the several obtained effective temperature control duration ratios.

[0084] In this embodiment, the duration module 203 includes a first duration unit and a second duration unit;

[0085] The first duration unit is configured to obtain a first temperature duration before the average value of the driver's seat head temperature and the co-driver's seat head temperature first reaches the temperature threshold from when the vehicle starts to start and a first duration within the temperature threshold range according to the temperatures collected by the several temperature sensors and the preset time period;

[0086] The second duration unit is configured to obtain a first driving duration of each cyclic drive of the vehicle according to the preset test cycle condition and the number of cycles; and obtain the second duration from when the average value of the driver's seat head temperature and the co-driver's seat head temperature is within the temperature threshold to when the vehicle stops cyclic driving according to the first temperature duration and the first driving duration.

[0087] In this embodiment, the evaluation module 205 includes a statistics unit, a confirmation unit, and an evaluation unit;

[0088] The statistics unit is configured to obtain several effective temperature control duration ratios of the heat pump air conditioner at different ambient temperatures by conducting tests at different ambient temperatures;

[0089] The confirmation unit is used to calculate the average value of the two largest effective temperature control duration ratios among the obtained several effective temperature control duration ratios, and confirm the temperature control duration ratio threshold according to the average value;

[0090] The evaluation unit is used to compare the remaining several effective temperature control duration ratios obtained after excluding the first effective temperature control duration ratio and the second effective temperature control duration ratio with the temperature control duration ratio threshold, and judge whether all the remaining several effective temperature control duration ratios are greater than the temperature control duration ratio threshold; if so, the heat pump air conditioner of the vehicle has low-temperature reliability; if not, the heat pump air conditioner of the vehicle does not have low-temperature reliability.

[0091] In this embodiment, according to the low-temperature reliability test device and the low-temperature reliability test method of the vehicle heat pump air conditioner, and according to the preset test cycle conditions and preset different ambient temperatures, the vehicle is controlled to circulate and drive, so that the test fits the actual driving conditions of the vehicle, improving the authenticity and accuracy of the test method. By setting different ambient temperatures, it is ensured that the heat pump air conditioner of the vehicle is tested in different low-temperature environments, improving the comprehensiveness of the test method. During the test process, by collecting the temperatures of several different test points inside the vehicle and the corresponding time of the temperature, the temperature data and time data provide an intuitive basis for the subsequent evaluation of the heat pump air conditioner, reducing the complexity of the test method. Then, according to the obtained temperature data and duration data, the first duration and the second duration that meet the evaluation conditions are judged and screened. According to the first duration and the second duration, the effective temperature control duration ratio of the heat pump air conditioner of the vehicle is obtained. By comparing the effective temperature control duration ratio with the preset temperature control duration ratio threshold, the test result of the low-temperature reliability of the heat pump air conditioner of the vehicle is obtained simply and directly. Through the temperatures and time data of different test points, the comprehensive and effective temperature control degree of the heat pump air conditioner on the temperature of the vehicle is obtained. According to the temperature and time data inside the vehicle, the test result of the low-temperature reliability of the heat pump air conditioner is obtained simply and effectively.

[0092] Embodiment 2

[0093] Please refer to Figure 3 , a low-temperature reliability test method for a vehicle heat pump air conditioner provided by another embodiment of the present invention, which mainly includes steps 301 to 305, specifically including:

[0094] Step 301: Check whether the heat pump air conditioner system of the vehicle works normally. If it is normal, set the heat pump air conditioner to the heating mode.

[0095] In this embodiment, before starting the vehicle heat pump air conditioner, it is necessary to detect whether the working performance of the heat pump air conditioner is normal, including that all components of the air conditioning system work normally, the air conditioning temperature adjustment function is normal, the air conditioning wind speed adjustment function is normal, the air conditioning internal and external circulation mode switching function is normal, etc., and check whether the airtightness of the vehicle meets the vehicle technical requirements. If all the above inspections meet the requirements, then start the heat pump air conditioner of the vehicle to start heating. The inspection steps in this embodiment include:

[0096] 1. Check the working status of the components of the air conditioning system. After starting the vehicle, turn on the air conditioning system, press the AC switch, adjust the temperature to the lowest and the air volume to the maximum. If cold air blows out from the air outlet of the air conditioner, it means that the air conditioner blower and compressor work normally. Open the engine hood and observe that the front electric fan rotates normally;

[0097] 2. Adjust the air conditioning temperature to the highest and feel the increase in the air temperature at the air outlet of the air conditioner, indicating that the air conditioning temperature adjustment function is normal;

[0098] 3. Adjust the air conditioning wind speed and feel the change in the wind speed at the air outlet of the air conditioner, indicating that the air conditioning wind speed adjustment function is normal;

[0099] 4. Press the internal and external circulation switch or the internal circulation switch (for some models, the internal and external circulation have separate buttons. When the internal circulation switch is in the off state), the internal circulation indicator light is on or the internal circulation logo is displayed on the screen; press the internal and external circulation switch or the external circulation switch again (for models with separate internal and external circulation buttons), adjust the air conditioner to the maximum air volume gear, place a thin piece of paper on the air inlet grille outside the front wiper cover, the internal circulation indicator light goes out, and the external circulation indicator light is on. Check that the thin piece of paper on the air inlet grille outside the front wiper cover is adsorbed.

[0100] Step 302: Control the vehicle to perform multiple cyclic driving at different ambient temperatures according to the set test conditions.

[0101] In this embodiment, by comprehensively considering the winter temperatures in different regions and combining the theoretical working range of the heat pump air conditioner and the actual temperature range with heating requirements, the test ambient temperatures are set as 10°C, 5°C, 0°C, -5°C, and -10°C respectively. By considering the driving habits of different drivers in different regions across the country, the CLTC-P in the working conditions is selected as the test cycle condition. To ensure the driving duration of the vehicle, it is necessary to continuously drive 4 CLTC-P cycles, and then considering rest, charging, etc., add 1 hour of in-place idling condition. According to the above-mentioned set test conditions and the ambient temperature, the specific test conditions formulated in this embodiment are:

[0102]

[0103] According to the test conditions, the vehicle is controlled to run in a cycle, and during each cycle, the deviation between the temperature of each measuring point in the passenger compartment and the ambient temperature is not more than ±2°C when the vehicle is immersed in the ambient temperature of the condition. During the immersion period, all doors and windows are opened.

[0104] Step 303: The temperature sensors disposed at a plurality of test points inside the vehicle collect the temperature during the cyclic driving of the vehicle under different ambient temperatures. The temperature sensors inside the vehicle collect the temperature.

[0105] In this embodiment, the step is specifically as follows: first, several test points are set inside the vehicle, and temperature sensors are set at the several test points to collect the temperature of the several test points in real time. In this embodiment, the several test points are as follows:

[0106]

[0107]

[0108] In this embodiment, temperature sensors are arranged at the plurality of test points to collect the temperature of the vehicle when it is traveling under different working conditions.

[0109] Step 304: Calculate the effective ratio of temperature control of the vehicle at different ambient temperatures, and determine a ratio threshold.

[0110] In this embodiment, firstly, taking working condition 1 as an example, according to the collected measuring point temperature data, the data before the average values ​​of the driver's head temperature and the co-driver's head temperature first reach the range of 22°C±2°C at the beginning of the test are excluded, and the remaining data are the effective test duration, recorded as t1; the number of data whose average values ​​of the driver's head temperature and the co-driver's head temperature are within the range of 22°C±2°C selected in the effective test duration, that is, the duration occupied, is recorded as t2; then the effective ratio of the heat pump air conditioner temperature control under working condition 1 is V1=t1 / t2, and the temperature change table of the driver's head temperature and the co-driver's head temperature changing with time is obtained as follows:

[0111]

[0112] Taking the above table as an example, t1 = 10500s, t2 = 10500 - 9 = 10491s, then V1 = 10491 / 10500 ≈ 100%. During actual tests, the lower the ambient temperature, the longer the time for the average value to exceed the range. Therefore, the ambient temperatures set for working conditions 1 and 2 are taken as the preferred working temperatures of the heat pump air conditioner. The average value of the effective temperature control ratios of the heat pump air conditioners under working conditions 1 and 2 is obtained. Then, the normal working duration ratio of the heat pump air conditioner under other working conditions should ensure that the heating effect of the vehicle reaches 90% of the average heating effect under the preferred working temperature for reference. Then, the ratio threshold is V = (V1 + V2) / 2 × 90%.

[0113] Step 305: Determine the low-temperature reliability of the vehicle's heat pump according to the ratio threshold.

[0114] In this embodiment, the effective temperature control ratios of the heat pump air conditioner obtained under the remaining working conditions of the vehicle are obtained and compared with the ratio threshold. If V3, V4, and V5 are all greater than the ratio threshold, the vehicle's heat pump air conditioner has low-temperature reliability. If there is any working condition where the effective temperature control ratio is less than the ratio threshold, the heat pump air conditioner does not have low-temperature reliability.

[0115] Another embodiment of the present invention provides a method for testing the low-temperature reliability of a vehicle's heat pump air conditioner. According to the preset test cycle working conditions and preset different ambient temperatures, the vehicle is controlled to circulate and drive, so that the test fits the actual driving situation of the vehicle, improving the authenticity and accuracy of the test method. By setting different ambient temperatures, it is ensured that the vehicle's heat pump air conditioner is tested under different low-temperature environments, improving the comprehensiveness of the test method. During the test process, by collecting the temperatures of several different test points inside the vehicle and the corresponding time, the temperature data and time data provide an intuitive basis for subsequent evaluation of the heat pump air conditioner, reducing the complexity of the test method. Then, according to the obtained temperature data and duration data, the first duration and the second duration that meet the evaluation conditions are determined and screened. According to the first duration and the second duration, the effective temperature control duration ratio of the vehicle's heat pump air conditioner is obtained. By comparing the effective temperature control duration ratio with the preset temperature control duration ratio threshold, the test result of the low-temperature reliability of the vehicle's heat pump air conditioner is obtained simply and directly. Through the temperatures and time data of different test points, the comprehensive and effective temperature control degree of the heat pump air conditioner on the vehicle's temperature is obtained. According to the temperature and time data inside the vehicle, the test result of the low-temperature reliability of the heat pump air conditioner is obtained simply and effectively.

[0116] The specific embodiments described above further elaborate on the object, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only for the specific embodiments of the present invention and is not intended to limit the protection scope of the present invention. In particular, it is pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A low-temperature reliability test method for a vehicle heat pump air conditioner, characterized in that Including: Controlling the vehicle to perform several cyclic drives respectively at several preset different ambient temperatures according to a preset test cycle condition; Collecting in real time the temperatures of several preset test points inside the vehicle and the corresponding times during each cyclic drive of the vehicle; After each cyclic drive ends, obtaining the average value of the temperatures of the several test points at the same time, and calculating the first duration of the average value within a preset temperature threshold and the second duration from when the average value first reaches the temperature threshold to when the vehicle stops cyclic driving; Obtaining several effective temperature control duration ratios of the vehicle's heat pump air conditioner at different ambient temperatures according to the first duration and the second duration corresponding to each cyclic drive; Obtaining the test result of the low-temperature reliability of the vehicle's heat pump air conditioner according to the several obtained effective temperature control duration ratios.

2. The low-temperature reliability test method for a vehicle heat pump air conditioner according to claim 1, characterized in that Before controlling the vehicle to perform several cyclic drives respectively at several preset different ambient temperatures, it specifically includes: Judging whether the functions of each component of the heat pump air conditioner are normal by starting various function switches of the heat pump air conditioner; Judging whether the compressor and temperature regulation functions of the heat pump air conditioner are normal by adjusting the cooling or heating temperature of the heat pump air conditioner; Judging whether the wind speed regulation function of the heat pump air conditioner is normal by adjusting the wind speed of the heat pump air conditioner; Starting the internal circulation or external circulation function of the heat pump air conditioner, and judging whether the internal circulation or external circulation function of the vehicle is normal by observing whether there is a corresponding internal circulation or external circulation mark on the vehicle's screen; Starting the vehicle's heat pump air conditioner and adjusting the temperature of the heat pump air conditioner to reach a preset temperature standard.

3. A method for testing the low-temperature reliability of a vehicle heat pump air conditioner according to claim 1, characterized in that, The controlling the vehicle to perform several cyclic drives respectively at several preset different ambient temperatures according to a preset test cycle condition specifically includes: Determining CLTC-P in the condition as the preset test cycle condition according to different driving environments and the driving requirements of the vehicle; Formulating several different temperature environments for the vehicle to perform cyclic driving in combination with the low-temperature conditions in different regions and the working temperature range of the heat pump air conditioner; Determining the number of cycles for each cyclic drive of the vehicle according to the driving duration requirement of the vehicle and the working efficiency of the heat pump air conditioner.

4. The low-temperature reliability test method for a vehicle heat pump air conditioner according to claim 1, characterized in that The collecting in real time the temperatures of several preset test points inside the vehicle and the corresponding times during each cyclic drive of the vehicle specifically includes: Collecting the temperatures of several test points inside the vehicle in real time through several temperature sensors arranged at the several test points according to a preset time period, and obtaining the temperatures of several preset test points inside the vehicle and the corresponding times; The several test points include the head of the driver's seat, the feet of the driver's seat, the air outlet of the driver's seat, the head of the co-driver's seat, the feet of the co-driver's seat, and the air outlet of the feet of the co-driver's seat.

5. The method for testing the low-temperature reliability of a vehicle heat pump air conditioner according to claim 3, characterized in that, Obtaining the average temperature of the several test points at the same time, and calculating a first duration of the average value within a preset temperature threshold and a second duration from when the average value first reaches the temperature threshold to when the vehicle stops cyclic driving, specifically includes: According to the temperatures collected by several temperature sensors and a preset time period, obtaining a first temperature duration before the average value of the temperature at the driver's seat head and the temperature at the co-driver's seat head first reaches the temperature threshold from when the vehicle starts, and a first duration of the average value within the temperature threshold range; According to a preset test cycle condition and the number of cycles, obtaining a first driving duration for each cyclic driving of the vehicle; According to the first temperature duration and the first driving duration, obtaining a second duration from when the average value of the temperature at the driver's seat head and the temperature at the co-driver's seat head is within the temperature threshold to when the vehicle stops cyclic driving.

6. The low-temperature reliability test method for a vehicle heat pump air conditioner according to claim 1, characterized in that The obtaining, according to the first duration and the second duration corresponding to each cyclic driving, of several effective temperature control duration ratios of the vehicle heat pump air conditioner at different ambient temperatures, specifically includes: According to each cyclic driving of the vehicle, obtaining several effective temperature control duration ratios of the heat pump air conditioner of the vehicle at different ambient temperatures by calculating the duration ratio of the first duration occupying the second duration.

7. The low-temperature reliability test method for a vehicle heat pump air conditioner according to claim 1, characterized in that The obtaining, according to the several obtained effective temperature control duration ratios, of the test result of the low-temperature reliability of the vehicle heat pump air conditioner, specifically includes: By conducting tests at different ambient temperatures, obtaining several effective temperature control duration ratios of the heat pump air conditioner at different ambient temperatures; Obtaining the average value of the two effective temperature control duration ratios with the largest values among the several obtained effective temperature control duration ratios, and determining a temperature control duration ratio threshold according to the average value; After excluding the first effective temperature control duration ratio and the second effective temperature control duration ratio, comparing the remaining several effective temperature control duration ratios with the temperature control duration ratio threshold to determine whether all the remaining several effective temperature control duration ratios are greater than the temperature control duration ratio threshold; If so, the heat pump air conditioner of the vehicle has low-temperature reliability; If not, the heat pump air conditioner of the vehicle does not have low-temperature reliability.

8. A low-temperature reliability test device for a vehicle heat pump air conditioner, characterized in that, Including: A cyclic driving module, a collection module, a duration module, a calculation module, and an evaluation module; The cyclic driving module is used to control the vehicle to perform several cyclic drivings at several preset different ambient temperatures respectively according to a preset test cycle condition; The collection module is used to collect in real time the temperatures of several preset test points inside the vehicle and the corresponding times during each cyclic driving of the vehicle; The duration module is used, after each cyclic driving ends, to obtain the average temperature of the several test points at the same time, and calculate a first duration of the average value within a preset temperature threshold and a second duration from when the average value first reaches the temperature threshold to when the vehicle stops cyclic driving; The calculation module is used to obtain several effective temperature control duration ratios of the vehicle heat pump air conditioner at different ambient temperatures according to the first duration and the second duration corresponding to each cyclic driving; The evaluation module is used to obtain the test result of the low-temperature reliability of the heat pump air conditioner of the vehicle according to the obtained several effective temperature control duration ratios.

9. The low-temperature reliability test device for a vehicle heat pump air conditioner according to claim 8, characterized in that The duration module includes a first duration unit and a second duration unit; The first duration unit is used to obtain the first temperature duration before the average value of the head temperatures of the driver's seat and the co-driver's seat first reaches the temperature threshold and the first duration within the temperature threshold range from the start of the vehicle to the average value of the head temperatures of the driver's seat and the co-driver's seat collected by several temperature sensors and a preset time period; The second duration unit is used to obtain the first driving duration of each cyclic driving of the vehicle according to a preset test cycle condition and the number of cycles; According to the first temperature duration and the first driving duration, obtain the second duration from the temperature threshold to the stop of the cyclic driving of the vehicle when the average value of the head temperatures of the driver's seat and the co-driver's seat is located there; 10. A low-temperature reliability test device for a vehicle heat pump air conditioner according to claim 8, characterized in that, The evaluation module includes a statistics unit, a confirmation unit and an evaluation unit; The statistics unit is used to obtain several effective temperature control duration ratios of the heat pump air conditioner at different ambient temperatures by conducting tests at different ambient temperatures; The confirmation unit is used to obtain the average value of the two largest effective temperature control duration ratios among the obtained several effective temperature control duration ratios, and confirm the temperature control duration ratio threshold according to the average value; The evaluation unit is used to compare the remaining several effective temperature control duration ratios obtained after excluding the first effective temperature control duration ratio and the second effective temperature control duration ratio with the temperature control duration ratio threshold, and determine whether all the remaining several effective temperature control duration ratios are greater than the temperature control duration ratio threshold; if so, the heat pump air conditioner of the vehicle has low-temperature reliability; if not, the heat pump air conditioner of the vehicle does not have low-temperature reliability.

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