Method and system for carrying out fault diagnosis on vehicle-mounted air conditioner of vehicle and vehicle

Abstract

The invention provides a method and system for carrying out fault diagnosis on a vehicle-mounted air conditioner of a vehicle, the vehicle and a computer readable storage medium. The method comprises the steps that the gas flow Fc of a cold air outlet of an evaporation box of the vehicle-mounted air conditioner is obtained; the air flow Fo of an air outlet of the vehicle-mounted air conditioner is obtained, and air flowing out of the cold air outlet flows to the air outlet through a cold air supply pipeline of the vehicle-mounted air conditioner; the leakage rate delta F of the cold air supply pipeline is monitored, and delta F = Fc-Fo; the unit leakage amount L of the cold air supply pipeline is determined, the # imgabs0 # responds to the situation that the unit leakage amount L is larger than a first preset value S1, it is determined that the cold air supply pipeline breaks down, and the first preset value S1 is determined according to the empirical value. According to the method, the system, the vehicle and the computer readable storage medium, the fault point of the vehicle-mounted air conditioner can be positioned under the condition that the vehicle-mounted air conditioner is not disassembled, the time for disassembling the vehicle-mounted air conditioner is saved, and damage to parts of the vehicle-mounted air conditioner due to disassembly is reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and in particular to a method, system, vehicle and computer-readable storage medium for diagnosing faults of an onboard air conditioner of a vehicle. Background Art

[0002] Car air conditioners are important components for achieving vehicle comfort functions, and whether they can work properly has a great impact on user experience. When a car air conditioner fails, users hope to quickly find the cause and solve it. However, the internal structure of a car air conditioner is complex, involving many parts, and troubleshooting requires complex disassembly, which takes a lot of time; and there are a large number of thin plastic parts in the car air conditioner, which can easily cause parts damage during disassembly. Summary of the invention

[0003] To at least partially solve the above problems, according to a first aspect of the present application, an embodiment of the present application provides a method for diagnosing a fault of an on-board air conditioner of a vehicle, comprising: obtaining a gas flow rate Fc of a cold air outlet of an evaporator box of the on-board air conditioner; obtaining a gas flow rate Fo of an air outlet of the on-board air conditioner, wherein the gas flowing out of the cold air outlet flows to the air outlet via a cold air supply pipeline of the on-board air conditioner; monitoring a leakage amount ΔF of the cold air supply pipeline, wherein ΔF=Fc-Fo; determining a unit leakage amount L of the cold air supply pipeline, wherein In response to the unit leakage amount L being greater than the first preset value S 1 , determine that the cold air supply pipeline fails, wherein the first preset value S 1 Determined based on empirical values.

[0004] In some preferred embodiments, the air outlet of the vehicle air conditioner includes a normal blowing outlet that is kept open and one or more controllable outlets that can be controlled to open and close, and the method further includes: opening one of the one or more controllable outlets in sequence and keeping the other controllable outlets closed; obtaining the gas flow Fm of the opened controllable outlet, and obtaining the gas flow Fc of the cold air outlet of the evaporator at this time 0 、Gas flow Fu of the normal blowing mouth 0 ; Calculate the unit leakage of the branch where the controllable opening of the cold air supply pipeline is opened Obtain multiple corresponding to each controllable port value; responds to all controllable ports The values ​​are all greater than the second preset value S 2 , determine that the branch where the normal blowing port of the cold air supply pipeline is located has a fault, wherein the second preset value S 2 Determined based on empirical values.

[0005] In some preferred embodiments, the method further comprises: in response to all controllable ports The values ​​are not greater than the second preset value S 2 , and exists The value is greater than the second preset value S 2 ,Sure The value is greater than the second preset value S 2 The branch where the controllable port is located fails.

[0006] In some preferred embodiments, the controllable openings include a face blowing opening, a foot blowing opening, and a defrost opening, and the method further includes: opening the face blowing opening, and closing the foot blowing opening and the defrost opening, and calculating the unit leakage of the branch where the face blowing opening of the cold air supply pipeline is located. Among them, Fc 1 is the gas flow rate of the cold air outlet of the evaporator at this time, Fu 1 Therefore, the gas flow rate of the mouthpiece is usually Fd 1 = The gas flow rate of the face blowing port at this time; open the foot blowing port, and close the face blowing port and defrost port, and calculate the unit leakage of the branch where the foot blowing port of the cold air supply pipeline is located Among them, Fc 2 is the gas flow rate of the cold air outlet of the evaporator at this time, Fu 2 Therefore, the gas flow rate of the mouthpiece is usually Ff 2 = The gas flow rate of the foot blowing port at this time; open the defrost port, and close the face blowing port and foot blowing port, and calculate the unit leakage of the branch where the defrost port of the cold air supply pipeline is located Among them, Fc 3 is the gas flow rate of the cold air outlet of the evaporator at this time, Fu 3 Therefore, the gas flow rate of the mouthpiece is usually Fw 3 The gas flow rate of the defrost port at this time; are greater than the second preset value S 2 , determine that the branch where the normal blowing outlet of the cold air supply duct is located has a fault.

[0007] In some preferred embodiments, the method further comprises: Not greater than the second preset value S 2 ,and Greater than the second preset value S 2 , determine that the branch where the blowing port is located has a fault; or respond to Not greater than the second preset value S 2 ,and Greater than the second preset value S 2 , determine that the branch where the foot outlet is located has a fault; or respond to Not greater than the second preset value S 2 ,and Greater than the second preset value S 2 , determine that the branch where the defrost outlet is located is faulty.

[0008] In some preferred embodiments, the first preset value S 1 has a value range of 5% - 20%, and the first preset value S 1 is any value within its value range. The second preset value S 2 has a value range of 30% - 90%, and the second preset value S 2 is any value within its value range.

[0009] In some preferred embodiments, the method further includes: obtaining the temperatures at different positions of the vehicle; and performing a fault diagnosis on the vehicle's on-vehicle air conditioner based on the temperatures at different positions of the vehicle.

[0010] In some preferred embodiments, obtaining the temperatures at different positions of the vehicle includes: obtaining the gas temperature Te outside the vehicle; obtaining the gas temperature Tc at the cold air outlet of the evaporator of the on-vehicle air conditioner; obtaining the gas temperature To at the air outlet of the on-vehicle air conditioner; and obtaining the gas temperature Ti inside the vehicle.

[0011] In some preferred embodiments, performing a fault diagnosis on the vehicle's on-vehicle air conditioner based on the temperatures at different positions of the vehicle includes: monitoring the relationship between the temperatures at different positions of the vehicle; and in response to the relationship between the temperatures at different positions of the vehicle not satisfying Tc ≤ To ≤ Ti < Te, determining that a fault has occurred in the refrigerant circulation pipeline of the on-vehicle air conditioner.

[0012] According to a second aspect of the present application, an embodiment of the present application provides a system for fault diagnosis of a vehicle's on-vehicle air conditioner, which is used to execute the method described in any embodiment of the present application. The system includes: a temperature sensor for obtaining the temperatures at different positions of the vehicle; a flow sensor for obtaining the gas flow rates at different positions of the cold air supply pipeline of the on-vehicle air conditioner; a processor connected to the temperature sensor and the flow sensor, and the processor is capable of performing a fault diagnosis on the vehicle's on-vehicle air conditioner based on the data collected by the temperature sensor and the flow sensor; and an output device connected to the processor for outputting the diagnosis result of the processor.

[0013] According to a third aspect of the present application, an embodiment of the present application provides a vehicle including the system for fault diagnosis of a vehicle's on-vehicle air conditioner described in any embodiment of the present application.

[0014] According to a fourth aspect of the present application, a computer-readable storage medium stores a computer program thereon, and the computer program can be executed by a processor to implement the method described in any embodiment of the present application.

[0015] The embodiments of the present application provide a method, system, vehicle and computer-readable storage medium for diagnosing faults of a vehicle's air conditioner, which can locate the fault point of the vehicle air conditioner without disassembling the vehicle air conditioner, saving the time for disassembling the vehicle air conditioner and reducing the damage to the parts of the vehicle air conditioner caused by disassembly; in addition, before the present application was proposed, the sealing of the cold air supply duct of the vehicle air conditioner was an overlooked factor when diagnosing faults of the vehicle air conditioner. The embodiments of the present application detect the sealing of the cold air supply duct of the vehicle air conditioner, which can conduct a more comprehensive investigation of the cause of the failure of the vehicle air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a partial structure of a vehicle air conditioner provided in an embodiment of the present application;

[0017] Figure 2 is a flow chart of a method for diagnosing a fault of an onboard air conditioner of a vehicle provided in an embodiment of the present application;

[0018] Figure 3 It is a schematic diagram of a cold air supply pipeline of a vehicle air conditioner provided in an embodiment of the present application;

[0019] Figure 4 It is a structural diagram of a portion of the cold air supply pipeline of the vehicle air conditioner provided in an embodiment of the present application;

[0020] Figure 5 It is a schematic diagram of a system for diagnosing faults of an onboard air conditioner of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] The technical solutions of the preferred embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them, and the various embodiments and technical features can be combined with each other without conflict. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection claimed in this application.

[0022] The embodiment of the present application provides a method for diagnosing a fault of an onboard air conditioner of a vehicle. The vehicle may be any transport vehicle or engineering vehicle, such as a car, a train, a crane, an excavator, etc., which is not limited in the present application. In order to obtain a comfortable riding experience, an onboard air conditioner is usually installed on the vehicle.

[0023] Figure 1 1 is a schematic diagram of a partial structure of a vehicle air conditioner provided in an embodiment of the present application. Figure 1As shown, the vehicle air conditioner is usually composed of two parts: a refrigerant circulation pipeline and a cold air supply pipeline. The refrigerant circulation pipeline mainly includes an evaporator 200, a compressor 400, a condenser 500, an expansion valve 600 and a connecting pipeline. When the vehicle air conditioner realizes the refrigeration function, the compressor 400 sucks in low-temperature and low-pressure refrigerant gas and compresses it into high-temperature and high-pressure refrigerant gas; the high-temperature and high-pressure refrigerant gas passes through the condenser 500 and the expansion valve 600 and becomes a low-temperature and low-pressure refrigerant liquid; the low-temperature and low-pressure refrigerant liquid passes through the evaporator 200 and exchanges heat with the air blown in by the blower 100 and flowing through the evaporator 200, the heat of the air is absorbed, the temperature is reduced, and it becomes cold air. The cold air enters the vehicle to realize the cooling of the vehicle, and the low-temperature and low-pressure refrigerant liquid becomes a low-temperature and low-pressure refrigerant gas, which is sucked in by the compressor 400 again to realize the circulation of the refrigerant.

[0024] Combine the following Figure 1 The cold air supply pipeline is briefly introduced. The air outside the vehicle air conditioner is sent into the vehicle air conditioner by the blower 100, and after being filtered by the filter, it exchanges heat with the refrigerant at the evaporator box 200 of the vehicle air conditioner, and the temperature is reduced to become cold air. The cold air flows out from the cold air outlet of the evaporator box 200, and reaches the air outlet 300 of the vehicle air conditioner through the cold air supply pipeline, and then flows into the driving room of the vehicle from the air outlet 300. In some vehicles, the vehicle air conditioner may have multiple air outlets 300, and the multiple air outlets 300 are set at different positions inside the vehicle to blow cold air into the vehicle from different positions. In this case, the cold air supply pipeline may include a main line and branches leading to each air outlet 300, and each branch is connected to the main line.

[0025] In the related art, when diagnosing a vehicle air conditioner's fault, the fault scope is often narrowed to the refrigerant circulation pipeline, and the detection is limited to the refrigerant circulation pipeline. This method makes it difficult to comprehensively investigate the cause of the vehicle air conditioner's fault.

[0026] The inventors of this application have found through long-term practical experience that since vehicles are often accompanied by bumps during driving, the connections between the various components of the cold air supply duct of the vehicle air conditioner may loosen or even fall off, resulting in reduced sealing, and then causing cold air to leak in the cold air supply duct, while reducing the air volume at the air outlet. These factors will cause the cooling performance of the vehicle air conditioner to decline, affecting the user experience.

[0027] Accordingly, an embodiment of the present application provides a method for diagnosing faults of an onboard air conditioner of a vehicle. Figure 1 FIG. 1 is a flow chart of a method for diagnosing a fault of an onboard air conditioner of a vehicle provided in an embodiment of the present application. Figure 1As shown, the method may include step S101, step S102, step S103, step S104, and step S105, specifically: step S101, obtaining the gas flow rate of the cold air outlet of the evaporator box of the vehicle air conditioner, represented by Fc; step S102, obtaining the gas flow rate of the air outlet of the vehicle air conditioner, represented by Fo, wherein the gas flowing out of the cold air outlet flows to the air outlet via the cold air supply pipeline of the vehicle air conditioner; step S103, monitoring the leakage of the cold air supply pipeline, represented by ΔF, wherein ΔF=Fc-Fo; step S104, determining the unit leakage of the cold air supply pipeline, represented by L, wherein, Step S105, in response to the unit leakage amount L being greater than the first preset value S 1 , determine that the cold air supply pipeline fails, wherein the first preset value S 1 Determined based on empirical values.

[0028] In step S101, the gas flow rate Fc of the cold air outlet of the evaporator box of the vehicle air conditioner is obtained. The gas blown into the vehicle air conditioner exchanges heat at the evaporator box, becomes cold air, and flows out from the cold air outlet of the evaporator box. In this step, the gas flow rate Fc at the cold air outlet of the evaporator box is obtained. Fc can represent the total flow rate of cold air in the cold air supply pipeline. When the evaporator box has multiple cold air outlets, Fc can be the sum of the gas flow rates of all cold air outlets.

[0029] In some embodiments, gas flow data can be obtained by setting a flow sensor at the cold air outlet. The flow sensor can be a hot wire flow sensor, the basic principle of which is to detect that when the fluid passes through the heating element, it exchanges heat with the heating element and takes away heat from the heating element. The heat taken away by the fluid is related to the mass of the fluid flowing through the heating element per unit time. Under the premise that the components of the measured fluid remain unchanged, the heat taken away by the fluid and the mass flowing through the heating element are in a single-valued function relationship. Therefore, the hot wire flow sensor is a mass flow meter, and the detection result is independent of the temperature, pressure, and density of the measured medium. In addition, the hot wire flow sensor has no moving parts, so it works reliably and has good response characteristics. It also has obvious advantages in cost compared to other types of air flow sensors. Of course, in other embodiments, the flow sensor can also be other forms of air flow sensors, such as vane flow sensors, Karman vortex flow sensors, and thermal film flow sensors.

[0030] In step S102, the gas flow Fo of the air outlet of the vehicle air conditioner is obtained, and the gas flowing out of the cold air outlet flows to the air outlet via the cold air supply pipeline of the vehicle air conditioner. The air outlet of the vehicle air conditioner can be one or more. When there are multiple air outlets, Fo is the sum of the gas flow rates of all air outlets. In some embodiments, the gas flow data can be obtained by arranging a flow sensor at the air outlet. The flow sensor can be a hot wire flow sensor, or a vane flow sensor, a Karman vortex flow sensor, a hot film flow sensor, etc.

[0031] In step S103, the leakage amount ΔF of the cold air supply pipeline is monitored, where ΔF=Fc-Fo. In this embodiment, the gas flowing out of the cold air outlet flows to the air outlet via the cold air supply pipeline of the vehicle air conditioner, so the leakage amount ΔF of the cold air supply pipeline can be represented by the difference between the gas flow rate Fc of the cold air outlet of the evaporator and the gas flow rate Fo of the air outlet.

[0032] In step S104, the unit leakage L of the cold air supply pipeline is determined, where: During the use of the vehicle air conditioner, the ambient temperature and the temperature inside the vehicle are constantly changing, so the gas flow in the pipeline is also constantly changing. In addition, the gas flow in the pipeline is also affected by the user's setting value for the air volume. It can be understood that a larger air volume will lead to a larger leakage. It is difficult to accurately determine whether the cold air supply pipeline has a reduced sealing fault based only on the absolute value of the leakage. Therefore, in this embodiment, the concept of unit leakage is proposed. The unit leakage is the ratio of the leakage to the gas flow at the cold air outlet of the evaporator. The absolute value of the leakage is converted into a relative value to eliminate the influence of the change in the size of the gas flow on the fault diagnosis.

[0033] In step S105, in response to the unit leakage amount L being greater than the first preset value S 1 , determine that the cold air supply pipeline fails, wherein the first preset value S 1 Determined by empirical values. It is understandable that in a vehicle air conditioner, due to technical reasons, its cold air supply pipeline itself has a certain inherent unit leakage. Therefore, it cannot be determined that there is a leakage fault in the cold air supply pipeline based on the unit leakage L not being 0. In this embodiment, by setting the first preset value S 1 , to eliminate the influence of inherent leakage on fault diagnosis. Specifically, only when the unit leakage L is greater than the first preset value S 1 Only then was it determined that a leak occurred in the cold air supply pipeline.

[0034] The first preset value S 1It can be determined based on empirical values. For example, when the vehicle leaves the factory, the vehicle's fault-free vehicle air conditioning cold air supply pipeline can be tested to obtain the unit leakage at this time as the inherent unit leakage, and a reasonable deviation value is added to obtain the first preset value S 1 The unit leakage of multiple vehicles of the same model can be detected, and the average value of the unit leakage can be calculated, and a reasonable deviation value can be added to the average value as the first preset value S 1 , to improve the accuracy of measurement; the unit leakage of multiple vehicles of different models can also be detected, and the average value of the unit leakage can be calculated, and a reasonable deviation value can be added to the average value as the first preset value S 1 , in order to improve the applicable scope of the first preset value; it is also possible to detect the cold air supply pipeline of the vehicle air conditioner when the vehicle leaves the factory, obtain the unit leakage at this time as the inherent unit leakage, and use the inherent unit leakage as the first preset value S of the vehicle. 1 , the first preset value S 1 It can be stored in a computer-readable storage medium of the vehicle. In some embodiments, the first preset value S 1 It can be 10%. Of course, the first preset value S 1 It can also be other values. Affected by the vehicle model, the shape, size, and connection method of the cold air supply duct may be different. These factors will cause different inherent leakage amounts of the cold air supply duct. The first preset value S 1 The value range of can be 5%-20%, the first preset value S 1 It can be any value within the value range, such as 5%, 6%, 7%, 8%, 9%, 9.9%, 10.1%, 11%, 12%, 15%, 20%, etc.

[0035] The method for diagnosing faults of a vehicle's air conditioner provided in an embodiment of the present application can locate the fault point of the vehicle air conditioner without disassembling the vehicle air conditioner. On this basis, maintenance personnel can disassemble the parts near the fault point of the vehicle air conditioner in a targeted manner, saving the time of disassembling the vehicle air conditioner and reducing the damage to the vehicle air conditioner parts caused by disassembly.

[0036] In addition, before the present application was proposed, the sealing of the cold air supply duct of the vehicle air conditioner was an overlooked factor when diagnosing faults of the vehicle air conditioner. The embodiments of the present application detect the sealing of the cold air supply duct of the vehicle air conditioner, and take the sealing of the cold air supply duct into consideration as a fault factor of the vehicle air conditioner. It can be combined with existing fault diagnosis methods to conduct a more comprehensive investigation of the causes of faults of the vehicle air conditioner.

[0037] Figure 3is a schematic diagram of a cold air supply duct of a vehicle air conditioner provided in an embodiment of the present application, Figure 4 This is a structural diagram of a portion of the cold air supply duct of the vehicle air conditioner provided in the embodiment of the present application. Figure 3 and Figure 4 In some embodiments, the air outlet 300 of the vehicle air conditioner includes a normal blowing port 301 that remains open and one or more controllable ports that can be controlled to open and close. In order to provide users with a better experience, the air outlet 300 of the vehicle air conditioner is usually multiple. Among the multiple air outlets 300, a normal blowing port 301 may be included. The normal blowing port 301 does not have a closing function and is always kept open to ensure that the cold air supply duct of the vehicle air conditioner is unobstructed; the multiple air outlets 300 may also include one or more controllable ports, for example, the controllable ports may include a face blowing port 302, a foot blowing port 303, a defrost port 304, etc. The controllable ports can be controlled to open or close to meet the different usage needs of users. In this embodiment, multiple branches extend from the main road of the cold air supply duct, and the multiple branches are used to guide the cold air in the main road into each air outlet 300. A flap valve is usually provided on the branch where the controllable port is located. When the flap valve is closed, the airflow of the branch where the controllable port is located can be cut off to realize the opening or closing of the controllable port.

[0038] It can be understood that each branch may have a leakage fault. Therefore, the method provided in this embodiment also includes: opening one of the one or more controllable ports in sequence, and keeping the other controllable ports closed, at which time only the opened controllable port and the normal blowing port can discharge air; obtaining the gas flow Fm of the opened controllable port, and obtaining the gas flow Fc of the cold air outlet of the evaporator at this time 0 、Gas flow Fu of the normal blowing mouth 0 ; Calculate the unit leakage of the branch where the controllable opening of the cold air supply pipeline is opened By calculating the unit leakage L of the branch where the measured port is located m , to eliminate the influence of flow change on leakage; sequentially complete the detection of the controllable ports, and obtain multiple corresponding to each controllable port value; responds to all controllable ports The values ​​are all greater than the second preset value S 2 , determine that the branch where the normal blowing outlet of the cold air supply duct is located has a fault.

[0039] In this embodiment, due to the existence of the permanent blowing port, when detecting whether a single branch has a leakage fault, there is still airflow in the branch where the permanent blowing port is located. At this time, by judging whether the unit leakage amount is greater than a certain preset value, it cannot be determined whether the leakage fault occurs in the branch where the permanent blowing port is located or in the branch where the opened controllable port is located. Furthermore, the structure and control logic of the vehicle air conditioner at present cannot realize the function of only opening the permanent opening and closing all controllable ports at the same time, and the branch where the permanent opening is located cannot be detected separately. In addition, when some controllable ports are closed, the position where the flap valve itself contacts the pipeline may also leak, affecting the judgment of the unit leakage amount. Therefore, this embodiment detects the corresponding positions of all controllable ports in turn. value, and judge whether it is equal to the second preset value S 2 The size relationship can be used to determine the specific location of the leakage fault. The value reflects the contribution of the sum of the leakage of the branch where the open controllable port is located and the branch where the normal blowing port is located to the total leakage of the cold air supply pipeline. The values ​​are all greater than the second preset value S 2 When the branch where the normal blowing port is located is faulty, it can be determined whether the branch where the normal blowing port is located has a leakage fault.

[0040] The second preset value S 2 It can be determined based on empirical values. For example, in the laboratory, different sizes and types of leakage points can be set up artificially to measure and calculate the branch with leakage points. value, and on this basis, set a reasonable deviation value to obtain the second preset value S 2 It is also possible to use the maintenance measurement data collected by the maintenance department of the vehicle air conditioner, and obtain a reasonable second preset value S based on the measurement data 2 In some embodiments, the second preset value S 2 It can be 80%. Of course, the second preset value S 2 It can also be other values. For example, the second preset value S 1 It can be a value within 30%-90%, and the second preset value S 2 It can be any value within the value range, such as 30%, 40%, 50%, 60%, 70%, 79%, 79.9%, 80.1%, 81%, 82%, 85%, 90%, etc.

[0041] In some embodiments, the method further comprises: responding to all controllable ports The values ​​are not greater than the second preset value S 2 , and exists The value is greater than the second preset value S 2 ,Sure The value is greater than the second preset value S 2The branch where the controllable port is located fails.

[0042] Understandably, all controllable ports The values ​​are not greater than the second preset value S 2 , that is, there are some controllable The value is less than or equal to the second preset value S 2 , since each controllable port corresponds to The values ​​are affected by the leakage of the branch where the normal blowing port is located. Therefore, when this situation occurs, it is impossible that the branch where the normal blowing port is located has a leakage fault; at this time, when there is a controllable port corresponding to The value is greater than the second preset value S 2 , it must be that the branch where the controllable port is located has a leak, thereby determining whether the branch where each controllable port is located has a leak.

[0043] Specifically, in some embodiments, the controllable openings may include a face blowing opening 302, a foot blowing opening 303, and a defrost opening 304. The method further includes: opening the face blowing opening 302, and closing the foot blowing opening 303 and the defrost opening 304, and calculating the unit leakage of the branch where the face blowing opening 302 of the cold air supply pipeline is located. Among them, Fc 1 is the gas flow rate of the cold air outlet of the evaporator at this time, Fu 1 Therefore, the gas flow rate of the blowing port 301 is often Fd 1 Open the foot blowing port 303, and close the face blowing port 302 and the defrost port 304, calculate the unit leakage of the branch where the foot blowing port 303 of the cold air supply pipeline is located Among them, Fc 2 is the gas flow rate of the cold air outlet of the evaporator at this time, Fu 2 Therefore, the gas flow rate of the blowing port 301 is often Ff 2 The gas flow rate of the foot blowing port 302 at this time; open the defrost port 304, and close the face blowing port 302 and the foot blowing port 303, calculate the unit leakage of the branch where the defrost port 304 of the cold air supply pipeline is located Among them, Fc 3 is the gas flow rate of the cold air outlet of the evaporator at this time, Fu 3 Therefore, the gas flow rate of the blowing port 301 is often, Fw 3 The gas flow rate of the defrost port 302 at this time; in response to are greater than the second preset value S 2 , it is determined that the branch where the normal blowing port 301 of the cold air supply pipeline is located has a fault.

[0044] In some embodiments, the method further comprises: Not greater than the second preset value S 2 ,and Greater than the second preset value S 2 , determine that the branch where the blowing port 302 is located has a fault; or respond to Not greater than the second preset value S 2 ,and Greater than the second preset value S 2 , determine that the branch where the foot blowing port 303 is located has a fault; or respond to Not greater than the second preset value S 2 ,and Greater than the second preset value S 2 , it is determined that the branch where the defrost port 304 is located is faulty.

[0045] In some embodiments, the method further includes: obtaining the temperature at different positions of the vehicle; and performing fault diagnosis on the vehicle air conditioner based on the temperature at different positions of the vehicle. Fault information of the refrigerant circulation pipeline can be obtained through the temperature information at different positions of the vehicle. For example, the temperature of the gas in the evaporator box can be monitored to determine whether it is lower than a predetermined value to determine whether the refrigerant circulation pipeline is working normally; the temperature drop value of the gas before and after passing through the evaporator box can also be monitored to determine whether it meets a predetermined threshold to determine whether the refrigerant circulation pipeline is working normally; the temperature of the refrigerant in different components of the refrigerant circulation pipeline can also be monitored to determine whether the refrigerant circulation pipeline is faulty.

[0046] In this embodiment, the temperature at different positions of the vehicle is used to determine whether there is a fault in the refrigerant circulation pipeline of the vehicle air conditioner. This can be achieved by installing temperature sensors at corresponding positions. The structure is relatively simple and the cost is low. In addition, by combining temperature information and gas flow information, it is possible to determine whether there is a fault in the refrigerant circulation pipeline and the cold air supply pipeline, which can more comprehensively troubleshoot the cause of the vehicle air conditioner failure.

[0047] In some embodiments, obtaining the temperature at different positions of the vehicle includes: obtaining the gas temperature Te outside the vehicle; obtaining the gas temperature Tc at the cold air outlet of the evaporator box of the vehicle air conditioner; obtaining the gas temperature To at the air outlet of the vehicle air conditioner; and obtaining the gas temperature Ti inside the vehicle. In this embodiment, the temperature acquisition of the above four positions is relatively simple, and the collection positions of multiple temperatures are distributed along the air flow direction of the vehicle air conditioner. By judging whether the temperature between any of the four positions meets the temperature change law when the air flows in the vehicle air conditioner, it can be judged whether there is a fault in the refrigerant circulation pipeline of the vehicle air conditioner.

[0048] The gas temperature data can be obtained by setting temperature sensors. When obtaining the external gas temperature Te of the vehicle, a temperature sensor can be set outside the vehicle. For example, the temperature sensor can be set on the front bumper of the vehicle or at a suitable position on the outer casing, which is not limited in this application; when obtaining the gas temperature Tc at the cold air outlet of the evaporator of the vehicle-mounted air conditioner, a temperature sensor can be set at the cold air outlet of the evaporator; when obtaining the gas temperature To at the air outlet of the vehicle-mounted air conditioner, a temperature sensor can be set at some or all of the air outlets of the vehicle-mounted air conditioner, and the average value of the temperatures of multiple air outlets where air is blowing is used as the air outlet gas temperature To; when obtaining the gas temperature Ti inside the vehicle, a temperature sensor can be set on the ceiling inside the vehicle, or on the back of the vehicle seat, or at other positions where the air from the air outlet cannot directly blow. Multiple temperature sensors can be set inside the vehicle at the same time, and the average value of the multiple temperature sensors is used as the gas temperature Ti inside the vehicle.

[0049] In some embodiments, for fault diagnosis of the vehicle-mounted air conditioner of the vehicle, it includes: monitoring the relationship between the temperatures at different positions of the vehicle; in response to the relationship between the temperatures at different positions of the vehicle not satisfying Tc≤To≤Ti<Te, determining that a fault has occurred in the refrigerant circulation pipeline of the vehicle-mounted air conditioner. It can be understood that the evaporator is the location where cold air is formed. During the formation of cold air in the evaporator, it flows into the cold air supply pipeline through the cold air outlet of the evaporator, and then flows through the cold air supply pipeline to the air outlet of the vehicle-mounted air conditioner, and finally flows into the vehicle through the air outlet of the vehicle-mounted air conditioner. When the cold air flows along this path, its temperature will inevitably gradually decrease, or remain unchanged when the temperature inside the vehicle reaches the user's set desired value, but be lower than the external gas temperature of the vehicle. Therefore, when the refrigerant circulation pipeline is working properly, Tc, To, Ti, and Te should satisfy the following relationship: Tc≤To≤Ti<Te. When any two or more values do not satisfy this relationship, it can be considered that a fault has occurred in the refrigerant circulation pipeline.

[0050] According to the second aspect of the present application, an embodiment of the present application further provides a system for fault diagnosis of a vehicle-mounted air conditioner of a vehicle, which is used to execute the method described in any embodiment of the present application. Figure 5 It is a schematic diagram of a system for fault diagnosis of a vehicle-mounted air conditioner of a vehicle provided by an embodiment of the present application. As Figure 5 shown, the system includes a temperature sensor 1, a flow sensor 2, a processor 3, and an output device 4.

[0051] The temperature sensor 1 is used to obtain the temperatures at different positions of the vehicle. There can be multiple temperature sensors 1, and the temperature sensors 1 can be arranged on the vehicle in the manner described in any embodiment of the present application. The flow sensor 2 is used to obtain the gas flow rates at different positions of the cold air supply pipeline of the vehicle-mounted air conditioner. There can be multiple flow sensors 2, and the flow sensors 2 can be arranged on the vehicle in the manner described in any embodiment of the present application.

[0052] The processor 3 is connected to the temperature sensor 1 and the flow sensor 2. The processor 3 can perform fault diagnosis on the vehicle-mounted air conditioner based on the data collected by the temperature sensor 1 and the flow sensor 2. The processor 3 can be connected to the temperature sensor 1 and the flow sensor 2 in a wired or wireless manner. The processor 3 can perform operations on the data collected by the temperature sensor 1 and the flow sensor 2 to perform fault diagnosis and locate the fault point. The output device 4 is connected to the processor 3 and is used to output the diagnosis result of the processor 3. The output device 4 can be a display device, a sound-emitting device, or a combination thereof.

[0053] The system for performing fault diagnosis on the vehicle-mounted air conditioner of the vehicle can continuously operate when the vehicle-mounted air conditioner is running, monitor the gas flow rate data and temperature data collected by the sensors, and timely remind the user that the vehicle-mounted air conditioner has a fault. The system for performing fault diagnosis on the vehicle-mounted air conditioner of the vehicle can also be started by the user himself only when the user notices a decrease in the performance of the vehicle-mounted air conditioner.

[0054] In some embodiments, when the system for performing fault diagnosis on the vehicle-mounted air conditioner of the vehicle is running, it monitors whether each temperature data satisfies Tc ≤ To ≤ Ti < Te. When Tc ≤ To ≤ Ti < Te is not satisfied, the output device prompts the operator that there is a fault in the refrigerant circulation pipeline. The system simultaneously monitors the gas flow rate data. When the unit leakage amount L is greater than the first preset value S 1 , it prompts the operator that there is a leak in the cold air supply pipeline. Next, the processor can automatically control the switches of each controllable port to realize the automatic progress of fault diagnosis, or it can prompt the user, and the user manually switches the switches of each controllable port. Finally, according to the value, the fault diagnosis result is output.

[0055] According to the third aspect of the present application, an embodiment of the present application further provides a vehicle, including the system for performing fault diagnosis on the vehicle-mounted air conditioner of the vehicle described in any embodiment of the present application.

[0056] According to the fourth aspect of the present application, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. The computer program can be executed by a processor to implement the method described in any embodiment of the present application.

[0057] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and detail without departing from the scope defined by the claims of the present application. The dimensions described in the drawings and embodiments are not related to the specific objects and are not used to limit the protection scope of the present application. The dimensions of the objects can be selected and changed according to actual needs.

Claims

1. A method for diagnosing a fault of an onboard air conditioner of a vehicle, characterized in that: Including: Obtaining the gas flow rate Fc at the cold air outlet of the evaporator of the vehicle air conditioner; Obtaining the gas flow rate FO at the air outlet of the vehicle air conditioner, wherein the gas flowing out from the cold air outlet flows to the air outlet through the cold air supply pipeline of the vehicle air conditioner; Monitoring the leakage amount ΔF of the cold air supply pipeline, wherein ΔF = Fc - Fo; Determine the unit leakage L of the cold air supply pipeline, where: In response to the unit leakage amount L being greater than the first preset value S1, determining that the cold air supply pipeline fails, wherein the first preset value S1 is determined according to empirical values.

2. The method according to claim 1, characterized in that The air outlet of the vehicle air conditioner includes a constantly blowing opening that remains open and one or more controllable openings that can be controlled to open and close. The method further includes: Sequentially opening one of the one or more controllable openings and keeping the other controllable openings closed; Obtaining the gas flow rate Fm of the opened controllable opening, and obtaining the gas flow rate Fc0 at the cold air outlet of the evaporator and the gas flow rate Fu0 of the constantly blowing opening at this time; Calculate the unit leakage of the branch where the open controllable port of the cold air supply pipeline is located Obtain multiple corresponding to each controllable port value; Responds to all controllable ports If the values ​​are all greater than a second preset value S2, it is determined that a fault occurs in the branch where the normal blowing port of the cold air supply pipeline is located, wherein the second preset value S2 is determined based on an empirical value.

3. The method according to claim 2, characterized in that Further including: Responds to all controllable ports The values ​​are not greater than the second preset value S2, and there is The value is greater than the second preset value S2, determining A branch where the controllable port whose value is greater than the second preset value S2 is located fails.

4. The method according to claim 2, characterized in that: Wherein, The controllable openings include a face-blowing opening, a foot-blowing opening, and a defrosting opening. The method further includes: Open the face blowing port, close the foot blowing port and defrost port, and calculate the unit leakage of the branch where the face blowing port of the cold air supply pipeline is located Among them, Fc1 is the gas flow rate of the cold air outlet of the evaporator at this time, Fu1 is the gas flow rate of the normal blowing port at this time, and Fd1 is the gas flow rate of the face blowing port at this time; Open the foot blowing port, close the face blowing port and defrost port, and calculate the unit leakage of the branch where the foot blowing port of the cold air supply pipeline is located Among them, Fc2 is the gas flow rate of the cold air outlet of the evaporator at this time, Fu2 is the gas flow rate of the regular blowing port at this time, and Ff2 is the gas flow rate of the foot blowing port at this time; Open the defrost port, close the face blowing port and foot blowing port, and calculate the unit leakage of the branch where the defrost port of the cold air supply pipeline is located Among them, Fc3 is the gas flow rate of the cold air outlet of the evaporator at this time, Fu3 is the gas flow rate of the normal blowing port at this time, and Fw3 is the gas flow rate of the defrost port at this time; In response to If both are greater than the second preset value S2, it is determined that a fault occurs in the branch where the normal blowing port of the cold air supply pipeline is located.

5. The method according to claim 4, characterized in that Further including: In response to are not greater than the second preset value S2, and is greater than the second preset value S2, it is determined that the branch where the blowing port is located has a fault; Or In response to are not greater than the second preset value S2, and If the value is greater than the second preset value S2, it is determined that the branch where the foot blowing port is located has a fault; Or In response to are not greater than the second preset value S2, and If the value is greater than the second preset value S2, it is determined that a fault occurs in the branch where the defrost port is located.

6. The method according to claim 2, characterized in that The value range of the first preset value S1 is 5% - 20%, the first preset value S1 is any value within its value range, the value range of the second preset value S2 is 30% - 90%, and the second preset value S2 is any value within its value range.

7. The method according to claim 1, characterized in that Further including: Obtaining the temperatures at different positions of the vehicle; Based on the temperatures at different positions of the vehicle, performing a fault diagnosis on the vehicle air conditioner.

8. The method according to claim 7, characterized in that Wherein, The obtaining the temperatures at different positions of the vehicle includes: Obtaining the gas temperature Te outside the vehicle; Obtaining the gas temperature Tc at the cold air outlet of the evaporator of the vehicle air conditioner; Obtaining the gas temperature To at the air outlet of the vehicle air conditioner; Obtaining the gas temperature Ti inside the vehicle.

9. The method according to claim 8, characterized in that Wherein, The performing a fault diagnosis on the vehicle air conditioner based on the temperatures at different positions of the vehicle includes: Monitoring the relationship between the temperatures at different positions of the vehicle; In response to the relationship between the temperatures at different positions of the vehicle not satisfying Tc ≤ To ≤ Ti < Te, determining that the refrigerant circulation pipeline of the vehicle air conditioner fails.

10. A system for diagnosing faults of a vehicle air conditioner, characterized in that: For executing the method according to any one of claims 1 - 9, including: A temperature sensor for obtaining the temperatures at different positions of the vehicle; A flow sensor for obtaining the gas flow rates at different positions of the cold air supply pipeline of the vehicle air conditioner; A processor connected to the temperature sensor and the flow sensor, and the processor can perform a fault diagnosis on the vehicle air conditioner based on the data collected by the temperature sensor and the flow sensor; An output device connected to the processor for outputting the diagnosis result of the processor.

11. A vehicle, characterized in that: Including the system for performing a fault diagnosis on the vehicle air conditioner according to claim 10.

12. A computer-readable storage medium, characterized in that: Having a computer program stored thereon, and the computer program can be executed by a processor to implement the method according to any one of claims 1 - 9.

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