Air suspension fault diagnosis method, device and equipment and readable storage medium

Abstract

The invention provides an air suspension fault diagnosis method, device and equipment and a readable storage medium, and the method comprises the steps that in the process that an air pump inflates a target object, the change condition of a first target parameter is monitored, and the first target parameter at least comprises the pressure of an air pipeline where the air pump and the target object are located; if the change condition of the first target parameter meets a first condition, an air pipeline between the air pump and the target object is cut off, the change condition of a second target parameter is monitored, and the second target parameter at least comprises the pressure of the air pipeline where the air pump is located; and determining a reason for abnormal inflation of the target object by the air pump according to the change condition of the second target parameter. Through the method and the device, the reason for abnormal inflation of the target object by the air pump can be accurately diagnosed, so that the maintenance difficulty is reduced, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle fault diagnosis, and in particular to an air suspension fault diagnosis method, device, equipment and readable storage medium. Background Art

[0002] With the continuous development of the automobile industry, air suspension systems have been widely used in various types of vehicles. Air suspension has many advantages, such as adjustable vehicle height, improved ride comfort and improved vehicle handling.

[0003] At present, the fault diagnosis technology of air suspension has made some progress. In the prior art, when diagnosing the fault of air suspension, it is usually to monitor specific parameters during a specific working process, and diagnose whether there is a fault and the cause of the fault based on the specific performance of the specific parameters. However, the cause of the fault diagnosed in this way is not accurate, which brings great trouble to the maintenance personnel, making the maintenance process complicated and time-consuming, and may also lead to wrong maintenance decisions, further aggravating the degree of damage to the vehicle. Summary of the invention

[0004] The present application provides an air suspension fault diagnosis method, device, equipment and readable storage medium, which can accurately diagnose the cause of abnormal inflation of a target object by an air pump.

[0005] In a first aspect, an embodiment of the present application provides an air suspension fault diagnosis method, the air suspension fault diagnosis method comprising:

[0006] During the process of the air pump inflating the target object, monitoring the change of the first target parameter, wherein the first target parameter at least includes the pressure of the air pipeline where the air pump and the target object are located;

[0007] If the change of the first target parameter meets the first condition, the air pipeline between the air pump and the target object is cut off, and the change of the second target parameter is monitored, wherein the second target parameter at least includes the pressure of the air pipeline where the air pump is located;

[0008] The reason why the air pump inflates the target object abnormally is determined according to the change of the second target parameter.

[0009] Further, in one embodiment, the target object is an air spring, and the first target parameter includes the pressure of the air pump and the air pipeline where the air spring is located and the height of the air spring;

[0010] The step of monitoring the change of the first target parameter comprises:

[0011] When the inflation time reaches a first preset time, the pressure of the air pipeline where the air pump and the air spring are located is recorded as a first initial value, and the height of the air spring is recorded as a second initial value;

[0012] The difference between the pressure of the air pipeline where the air pump and the air spring are located and the first initial value is calculated in real time to obtain a first real-time difference, and the difference between the height of the air spring and the second initial value is calculated in real time to obtain a second real-time difference;

[0013] The first condition includes: at each moment within the second preset time length, the absolute value of the first real-time difference is less than the first threshold, and the absolute value of the second real-time difference is less than the second threshold.

[0014] Further, in one embodiment, the second target parameter includes the pressure of the air line where the air pump is located;

[0015] The step of monitoring the change of the second target parameter comprises:

[0016] When the air pipeline between the air pump and the air spring is cut off, the pressure of the air pipeline where the air pump is located is recorded as the third initial value;

[0017] Calculate in real time the difference between the pressure of the air pipeline where the air pump is located and the third initial value to obtain a third real-time difference value;

[0018] The step of determining the reason why the air pump inflates the target object abnormally according to the change of the second target parameter comprises:

[0019] If the change of the second target parameter meets the second condition, it is determined that the air pump and its power supply line are broken, and the second condition includes: at each moment within the third preset time length, the absolute value of the third real-time difference is less than the third threshold value;

[0020] If the change in the second target parameter meets the third condition, it is determined that the air spring or its air pipeline is leaking. The third condition includes: at any time within a third preset time period, the absolute value of the third real-time difference is greater than or equal to a third threshold.

[0021] Further, in one embodiment, the target object is an air tank, and the first target parameter includes the pressure of the air pipeline where the air pump and the air tank are located;

[0022] The step of monitoring the change of the first target parameter comprises:

[0023] When the inflation time reaches a fourth preset time, the pressure of the air pipeline where the air pump and the air storage tank are located is recorded as a fourth initial value;

[0024] The difference between the pressure of the air pipeline where the air pump and the air storage tank are located and the fourth initial value is calculated in real time to obtain a fourth real-time difference value;

[0025] The first condition includes: at each moment within the fifth preset time length, the absolute value of the fourth real-time difference is less than the fourth threshold.

[0026] Further, in one embodiment, the second target parameter includes the pressure of the air line where the air pump is located;

[0027] The step of monitoring the change of the second target parameter comprises:

[0028] When the air pipeline between the air pump and the air storage tank is cut off, the pressure of the air pipeline where the air pump is located is recorded as the fifth initial value;

[0029] Calculate in real time the difference between the pressure of the air line where the air pump is located and the fifth initial value to obtain a fifth real-time difference value;

[0030] The step of determining the reason why the air pump inflates the target object abnormally according to the change of the second target parameter comprises:

[0031] If the change of the second target parameter meets the fourth condition, it is determined that the air pump and its power supply line are broken, and the fourth condition includes: at each moment within the sixth preset time length, the absolute value of the fifth real-time difference is less than the fifth threshold value;

[0032] If the change in the second target parameter meets the fifth condition, it is determined that the air tank or its air pipeline is leaking, and the fifth condition includes: at any time within the sixth preset time period, the absolute value of the fifth real-time difference is greater than or equal to the fifth threshold.

[0033] Further, in one embodiment, during the process of the air pump inflating the target object, the pressure of the air pipeline where the air pump and the target object are located is measured by a pressure sensor in the air distribution valve;

[0034] The step of isolating the air pipeline between the air pump and the target object comprises:

[0035] Close the valve of the target object in the air distribution valve to measure the pressure of the air line where the air pump is located through the pressure sensor in the air distribution valve.

[0036] Furthermore, in one embodiment, the air suspension fault diagnosis method further includes:

[0037] When the air pump is not inflating any object, monitoring the pressure of the air line where the air pump is located;

[0038] If the pressure of the air pipeline where the air pump is located is greater than or equal to the sixth threshold value, it is determined that the air pump and its power supply circuit are short-circuited.

[0039] In a second aspect, an embodiment of the present application further provides an air suspension fault diagnosis device, the air suspension fault diagnosis device comprising:

[0040] A first monitoring module, used for monitoring changes in a first target parameter during the process of the air pump inflating the target object, wherein the first target parameter at least includes the pressure of the air pipeline where the air pump and the target object are located;

[0041] A second monitoring module is used for isolating the air pipeline between the air pump and the target object if the change of the first target parameter meets the first condition, and monitoring the change of the second target parameter, wherein the second target parameter at least includes the pressure of the air pipeline where the air pump is located;

[0042] The cause determination module is used to determine the cause of abnormal inflation of the target object by the air pump according to the change of the second target parameter.

[0043] In a third aspect, an embodiment of the present application further provides an air suspension fault diagnosis device, which includes a processor, a memory, and an air suspension fault diagnosis program stored in the memory and executable by the processor, wherein when the air suspension fault diagnosis program is executed by the processor, the steps of the above-mentioned air suspension fault diagnosis method are implemented.

[0044] In a fourth aspect, an embodiment of the present application further provides a readable storage medium, on which an air suspension fault diagnosis program is stored, wherein when the air suspension fault diagnosis program is executed by a processor, the steps of the above-mentioned air suspension fault diagnosis method are implemented.

[0045] In the present application, during the process of the air pump inflating the target object, the change of the first target parameter is monitored; if the change of the first target parameter meets the first condition, the air pipeline between the air pump and the target object is cut off, and the change of the second target parameter is monitored; the reason why the air pump inflates the target object abnormally is determined according to the change of the second target parameter. Through the present application, the reason why the air pump inflates the target object abnormally can be accurately diagnosed, thereby reducing the difficulty of maintenance and improving maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a flow chart of an air suspension fault diagnosis method in one embodiment of the present application;

[0047] Figure 2 This is a schematic diagram of the structure of an air suspension system in one embodiment of the present application;

[0048] Figure 3 This is a schematic diagram of the functional modules of an air suspension fault diagnosis device in one embodiment of the present application;

[0049] Figure 4 This is a schematic diagram of the hardware structure of the air suspension fault diagnosis device involved in the embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0052] In a first aspect, an embodiment of the present application provides an air suspension fault diagnosis method.

[0053] Figure 1 A schematic flow chart of an air suspension fault diagnosis method in an embodiment of the present application is shown.

[0054] Reference Figure 1 In one embodiment, the air suspension fault diagnosis method includes the following steps:

[0055] S1. During the process of the air pump inflating the target object, monitor the change of the first target parameter, wherein the first target parameter at least includes the pressure of the air pipeline where the air pump and the target object are located.

[0056] Specifically, in the air suspension system, the air pump does not work when the air tank has sufficient air. If the air spring needs to be inflated, the valve of the air tank and the valve of the air spring are opened to connect the air line between the air tank and the air spring, thereby inflating the air spring through the air tank.

[0057] The air pump works when the air volume in the air tank is insufficient, and the inflated object may be the air spring or the air tank. If the air spring needs to be inflated, start the air pump, open the valve of the air pump and the valve of the air spring, so that the air pipeline between the air pump and the air spring is connected, and the air pump is used to inflate the air spring. If the air spring does not need to be inflated, start the air pump, open the valve of the air pump and the valve of the air tank, so that the air pipeline between the air pump and the air tank is connected, and the air pump is used to inflate the air tank.

[0058] During the process of the air pump inflating the target object, if there is no abnormality, the first target parameter will show an expected change.

[0059] For example, when the air pump is inflating the air spring, the pressure of the air line where the air pump and the air spring are located will increase, and the height of the air spring will also increase.

[0060] For example, during the process of the air pump charging the air tank, the pressure of the air line where the air pump and the air tank are located will increase.

[0061] When the first target parameter shows an unexpected change, it indicates that there is an abnormality in the process of the air pump inflating the target object. However, under different abnormal reasons, the first target parameter may show the same change, resulting in the inability to accurately diagnose the cause of the inflation abnormality based on the change of the first target parameter.

[0062] For example, during the process of the air pump inflating the air spring, when the air pump and its power supply line are disconnected, the air pump does not supply high-pressure air to the air pipe between the air pump and the air spring. This may result in no obvious change in the pressure of the air pipe where the air pump and the air spring are located, and no obvious change in the height of the air spring for a period of time. When the air spring or its air pipe leaks, the high-pressure air that the air pump has supplied to the air pipe between the air pump and the air spring leaks. This may also result in no obvious change in the pressure of the air pipe where the air pump and the air spring are located, and no obvious change in the height of the air spring for a period of time.

[0063] For example, when the air pump is inflating an air tank, if the air pump and its power supply line are disconnected, the air pump does not introduce high-pressure air into the air pipeline between the air pump and the air tank, which may result in no obvious change in the pressure of the air pipeline where the air pump and the air tank are located for a period of time. When the air tank or its air pipeline leaks, the high-pressure air introduced by the air pump into the air pipeline between the air pump and the air tank leaks, which may also result in no obvious change in the pressure of the air pipeline where the air pump and the air tank are located for a period of time.

[0064] S2. If the change of the first target parameter meets the first condition, the air pipeline between the air pump and the target object is cut off, and the change of the second target parameter is monitored, wherein the second target parameter at least includes the pressure of the air pipeline where the air pump is located.

[0065] In this embodiment, the first condition is used to describe the change of the first target parameter when it is not in accordance with expectations and there are multiple possibilities for the corresponding abnormal cause. After the air pipeline between the air pump and the target object is cut off, the second target parameter will show different changes for different abnormal causes. Therefore, the cause of the inflation abnormality can be accurately diagnosed based on the change of the second target parameter.

[0066] Optionally, the air line between the air pump and the target object can be isolated by closing one of the valves of the air pump and the target object.

[0067] S3. Determine the reason why the air pump inflates the target object abnormally according to the change of the second target parameter.

[0068] For example, during the process of the air pump inflating the air spring, there is no obvious change in the pressure of the air pipe where the air pump and the air spring are located, and there is no obvious change in the height of the air spring. After isolating the air pipe between the air pump and the air spring, if the pressure of the air pipe where the air pump is located changes significantly, it means that the air pump and its power supply line are normal, and the abnormality is caused by leakage of the air spring or its air pipe. Conversely, if there is no obvious change in the pressure of the air pipe where the air pump is located, it means that the air pump and its power supply line are broken.

[0069] For example, during the process of the air pump inflating the air tank, there is no obvious change in the pressure of the air pipeline where the air pump and the air tank are located for a period of time. After the air pipeline between the air pump and the air tank is cut off, if the pressure of the air pipeline where the air pump is located changes significantly, it means that the air pump and its power supply line are normal, and the abnormality is caused by leakage of the air tank or its air pipeline. Conversely, if there is no obvious change in the pressure of the air pipeline where the air pump is located, it means that the air pump and its power supply line are broken.

[0070] In this embodiment, during the process of the air pump inflating the target object, the change of the first target parameter is monitored; if the change of the first target parameter meets the first condition, the air pipeline between the air pump and the target object is cut off, and the change of the second target parameter is monitored; the reason why the air pump inflates the target object abnormally is determined according to the change of the second target parameter. Through this embodiment, the reason why the air pump inflates the target object abnormally can be accurately diagnosed, thereby reducing the difficulty of maintenance and improving maintenance efficiency.

[0071] Further, in one embodiment, the target object is an air spring, and the first target parameter includes the pressure of the air pump and the air pipeline where the air spring is located and the height of the air spring;

[0072] The step of monitoring the change of the first target parameter comprises:

[0073] When the inflation time reaches a first preset time, the pressure of the air pipeline where the air pump and the air spring are located is recorded as a first initial value, and the height of the air spring is recorded as a second initial value;

[0074] The difference between the pressure of the air pipeline where the air pump and the air spring are located and the first initial value is calculated in real time to obtain a first real-time difference, and the difference between the height of the air spring and the second initial value is calculated in real time to obtain a second real-time difference;

[0075] The first condition includes: at each moment within the second preset time length, the absolute value of the first real-time difference is less than the first threshold, and the absolute value of the second real-time difference is less than the second threshold.

[0076] In this embodiment, when the air pump is inflating the air spring, and the pressure of the air pipeline where the air pump and the air spring are located does not change significantly and the height of the air spring does not change significantly for a period of time, specific parameter monitoring methods and condition judgment methods are provided to improve the accuracy of fault diagnosis.

[0077] It is particularly noted that in the short period of time when the valves of the air spring and the air pump are just opened, there is usually a pressure difference on both sides of the valve, and the first target parameter measured at this time will fluctuate significantly. The first preset time length is used to ensure that the pressure difference on both sides of the valve has been eliminated, so as to improve the reliability of the first initial value and the second initial value.

[0078] Further, in one embodiment, the second target parameter includes the pressure of the air line where the air pump is located;

[0079] The step of monitoring the change of the second target parameter comprises:

[0080] When the air pipeline between the air pump and the air spring is cut off, the pressure of the air pipeline where the air pump is located is recorded as the third initial value;

[0081] Calculate in real time the difference between the pressure of the air pipeline where the air pump is located and the third initial value to obtain a third real-time difference value;

[0082] The step of determining the reason why the air pump inflates the target object abnormally according to the change of the second target parameter comprises:

[0083] If the change of the second target parameter meets the second condition, it is determined that the air pump and its power supply line are broken, and the second condition includes: at each moment within the third preset time length, the absolute value of the third real-time difference is less than the third threshold value;

[0084] If the change in the second target parameter meets the third condition, it is determined that the air spring or its air pipeline is leaking. The third condition includes: at any time within a third preset time period, the absolute value of the third real-time difference is greater than or equal to a third threshold.

[0085] In this embodiment, after isolating the air pipeline between the air pump and the air spring, the cause of abnormal inflation of the air spring by the air pump is determined according to the change in the pressure of the air pipeline where the air pump is located. For the cases where the pressure of the air pipeline where the air pump is located changes significantly and the cases where the pressure of the air pipeline where the air pump is located does not change significantly, specific parameter monitoring methods and condition judgment methods are provided to improve the accuracy of fault diagnosis.

[0086] It should be noted that after isolating the air pipeline between the air pump and the air spring, in theory, the reason for the abnormal inflation of the air spring by the air pump can also be determined based on the change in the pressure of the air pipeline where the air spring is located. That is, if the pressure of the air pipeline where the air spring is located changes significantly, it means that the abnormal cause is leakage of the air spring or its air pipeline, and the air pump and its power supply line are normal. On the contrary, if the pressure of the air pipeline where the air spring is located does not change significantly, it means that the air pump and its power supply line are broken.

[0087] However, considering that in actual situations, the leakage rate of the air spring or its air pipeline is difficult to predict, while the inflation rate of the air pump is known, it would be more accurate to determine the cause of abnormal inflation of the air spring by the air pump based on the changes in the pressure of the air pipeline where the air pump is located.

[0088] Further, in one embodiment, the target object is an air tank, and the first target parameter includes the pressure of the air pipeline where the air pump and the air tank are located;

[0089] The step of monitoring the change of the first target parameter comprises:

[0090] When the inflation time reaches a fourth preset time, the pressure of the air pipeline where the air pump and the air storage tank are located is recorded as a fourth initial value;

[0091] The difference between the pressure of the air pipeline where the air pump and the air storage tank are located and the fourth initial value is calculated in real time to obtain a fourth real-time difference value;

[0092] The first condition includes: at each moment within the fifth preset time length, the absolute value of the fourth real-time difference is less than the fourth threshold.

[0093] In this embodiment, when the air pump is inflating the air tank, if the pressure of the air pipeline where the air pump and the air tank are located does not change significantly for a period of time, a specific parameter monitoring method and condition determination method are provided to improve the accuracy of fault diagnosis.

[0094] Similar to the previous article, in the short period of time when the valves of the gas tank and the air pump are just opened, there is usually a pressure difference on both sides of the valve, and the first target parameter measured at this time will have obvious fluctuations. The fourth preset time length is used to ensure that the pressure difference on both sides of the valve has been eliminated to improve the reliability of the fourth initial value.

[0095] Further, in one embodiment, the second target parameter includes the pressure of the air line where the air pump is located;

[0096] The step of monitoring the change of the second target parameter comprises:

[0097] When the air pipeline between the air pump and the air storage tank is cut off, the pressure of the air pipeline where the air pump is located is recorded as the fifth initial value;

[0098] Calculate in real time the difference between the pressure of the air line where the air pump is located and the fifth initial value to obtain a fifth real-time difference value;

[0099] The step of determining the reason why the air pump inflates the target object abnormally according to the change of the second target parameter comprises:

[0100] If the change of the second target parameter meets the fourth condition, it is determined that the air pump and its power supply line are broken, and the fourth condition includes: at each moment within the sixth preset time length, the absolute value of the fifth real-time difference is less than the fifth threshold value;

[0101] If the change in the second target parameter meets the fifth condition, it is determined that the air tank or its air pipeline is leaking, and the fifth condition includes: at any time within the sixth preset time period, the absolute value of the fifth real-time difference is greater than or equal to the fifth threshold.

[0102] In the present embodiment, after isolating the air pipeline between the air pump and the air tank, the cause of abnormal inflation of the air tank by the air pump is determined according to the change in the pressure of the air pipeline where the air pump is located. For the cases where the pressure of the air pipeline where the air pump is located changes significantly and the cases where the pressure of the air pipeline where the air pump is located does not change significantly, specific parameter monitoring methods and condition judgment methods are provided to improve the accuracy of fault diagnosis.

[0103] As mentioned above, the leakage rate of the air tank or its air pipeline is difficult to predict, but the inflation rate of the air pump is known. It will be more accurate to determine the cause of abnormal inflation of the air tank by the air pump based on the changes in the pressure of the air pipeline where the air pump is located.

[0104] Figure 2 A schematic structural diagram of an air suspension system in an embodiment of the present application is shown.

[0105] Reference Figure 2 In some air suspension systems, instead of separately setting pressure sensors for the air pump, air tank, and each air spring, the pressure of the air line where a single object is located and the pressure of the air line where multiple objects are located are measured with the help of pressure sensors in the air distribution valve and different valve opening methods.

[0106] Specifically, when the valve of a certain object (air pump / air tank / left front air spring / right front air spring / left rear air spring / right rear air spring) in the air distribution valve is opened and other valves are closed, the pressure sensor in the air distribution valve measures the pressure of the air pipeline where the object is located. When the valves of multiple objects in the air distribution valve (such as air pump and air tank, air pump and air spring, air tank and air spring) are opened and other valves are closed, the pressure sensor in the air distribution valve measures the pressure of the air pipeline where these objects are located.

[0107] Further, in one embodiment, during the process of the air pump inflating the target object, the pressure of the air pipeline where the air pump and the target object are located is measured by a pressure sensor in the air distribution valve;

[0108] The step of isolating the air pipeline between the air pump and the target object comprises:

[0109] Close the valve of the target object in the air distribution valve to measure the pressure of the air line where the air pump is located through the pressure sensor in the air distribution valve.

[0110] In this embodiment, during the process of the air pump inflating the target object, the valves of the air pump and the target object in the air distribution valve are opened, and other valves are closed. The pressure measured by the pressure sensor in the air distribution valve is the pressure of the air pipeline where the air pump and the target object are located. After closing the valve of the target object in the air distribution valve, the valve of the air pump in the air distribution valve is opened, and other valves are closed. The pressure measured by the pressure sensor in the air distribution valve is the pressure of the air pipeline where the air pump is located.

[0111] Furthermore, in one embodiment, the air suspension fault diagnosis method further includes:

[0112] When the air pump is not inflating any object, monitoring the pressure of the air line where the air pump is located;

[0113] If the pressure of the air pipeline where the air pump is located is greater than or equal to the sixth threshold value, it is determined that the air pump and its power supply circuit are short-circuited.

[0114] In this embodiment, when the air pump is not inflating any object, the pressure of the air pipeline where the air pump is located is monitored to determine whether the air pump and its power supply circuit are short-circuited, thereby improving the comprehensiveness of fault diagnosis.

[0115] Optionally, the sixth threshold is greater than the maximum operating pressure of the entire air suspension system and less than the opening pressure of the mechanical protection valve of the air pump.

[0116] For example, the maximum working pressure of the entire air suspension system is 18 bar, the opening pressure of the mechanical protection valve of the air pump is 21 bar, and the sixth threshold value can be set to 19 bar.

[0117] In a second aspect, an embodiment of the present application also provides an air suspension fault diagnosis device.

[0118] Figure 3 A schematic diagram of functional modules of an air suspension fault diagnosis device in one embodiment of the present application is shown.

[0119] Reference Figure 3 In one embodiment, the air suspension fault diagnosis device includes:

[0120] A first monitoring module 10 is used to monitor changes in a first target parameter during the process of the air pump inflating the target object, wherein the first target parameter at least includes the pressure of the air pipeline where the air pump and the target object are located;

[0121] The second monitoring module 20 is used to cut off the air pipeline between the air pump and the target object if the change of the first target parameter meets the first condition, and monitor the change of the second target parameter, wherein the second target parameter at least includes the pressure of the air pipeline where the air pump is located;

[0122] The cause determination module 30 is used to determine the cause of abnormal inflation of the target object by the air pump according to the change of the second target parameter.

[0123] Further, in one embodiment, the target object is an air spring, and the first target parameter includes the pressure of the air pump and the air pipeline where the air spring is located and the height of the air spring;

[0124] The first monitoring module 10 is used for:

[0125] When the inflation time reaches a first preset time, the pressure of the air pipeline where the air pump and the air spring are located is recorded as a first initial value, and the height of the air spring is recorded as a second initial value;

[0126] The difference between the pressure of the air pipeline where the air pump and the air spring are located and the first initial value is calculated in real time to obtain a first real-time difference, and the difference between the height of the air spring and the second initial value is calculated in real time to obtain a second real-time difference;

[0127] The first condition includes: at each moment within the second preset time length, the absolute value of the first real-time difference is less than the first threshold, and the absolute value of the second real-time difference is less than the second threshold.

[0128] Further, in one embodiment, the second target parameter includes the pressure of the air line where the air pump is located;

[0129] The second monitoring module 20 is used for:

[0130] When the air pipeline between the air pump and the air spring is cut off, the pressure of the air pipeline where the air pump is located is recorded as the third initial value;

[0131] Calculate in real time the difference between the pressure of the air pipeline where the air pump is located and the third initial value to obtain a third real-time difference value;

[0132] The cause determination module 30 is used for:

[0133] If the change of the second target parameter meets the second condition, it is determined that the air pump and its power supply line are broken, and the second condition includes: at each moment within the third preset time length, the absolute value of the third real-time difference is less than the third threshold value;

[0134] If the change in the second target parameter meets the third condition, it is determined that the air spring or its air pipeline is leaking. The third condition includes: at any time within a third preset time period, the absolute value of the third real-time difference is greater than or equal to a third threshold.

[0135] Further, in one embodiment, the target object is an air tank, and the first target parameter includes the pressure of the air pipeline where the air pump and the air tank are located;

[0136] The first monitoring module 10 is used for:

[0137] When the inflation time reaches a fourth preset time, the pressure of the air pipeline where the air pump and the air storage tank are located is recorded as a fourth initial value;

[0138] The difference between the pressure of the air pipeline where the air pump and the air storage tank are located and the fourth initial value is calculated in real time to obtain a fourth real-time difference value;

[0139] The first condition includes: at each moment within the fifth preset time length, the absolute value of the fourth real-time difference is less than the fourth threshold.

[0140] Further, in one embodiment, the second target parameter includes the pressure of the air line where the air pump is located;

[0141] The second monitoring module 20 is used for:

[0142] When the air pipeline between the air pump and the air storage tank is cut off, the pressure of the air pipeline where the air pump is located is recorded as the fifth initial value;

[0143] Calculate in real time the difference between the pressure of the air line where the air pump is located and the fifth initial value to obtain a fifth real-time difference value;

[0144] The cause determination module 30 is used for:

[0145] If the change of the second target parameter meets the fourth condition, it is determined that the air pump and its power supply line are broken, and the fourth condition includes: at each moment within the sixth preset time length, the absolute value of the fifth real-time difference is less than the fifth threshold value;

[0146] If the change in the second target parameter meets the fifth condition, it is determined that the air tank or its air pipeline is leaking, and the fifth condition includes: at any time within the sixth preset time period, the absolute value of the fifth real-time difference is greater than or equal to the fifth threshold.

[0147] Furthermore, in one embodiment, the first monitoring module 10 is used to:

[0148] When the air pump is inflating the target object, the pressure of the air pipeline where the air pump and the target object are located is measured by the pressure sensor in the air distribution valve;

[0149] The second monitoring module 20 is used for:

[0150] Close the valve of the target object in the air distribution valve to measure the pressure of the air line where the air pump is located through the pressure sensor in the air distribution valve.

[0151] Further, in one embodiment, the air suspension fault diagnosis device further includes a third monitoring module;

[0152] The third monitoring module is used to monitor the pressure of the air pipeline where the air pump is located when the air pump is not inflating any object;

[0153] The cause determination module 30 is further configured to determine that the air pump and its power supply circuit are short-circuited if the pressure of the air pipeline where the air pump is located is greater than or equal to a sixth threshold.

[0154] Among them, the functional implementation of each module in the above-mentioned air suspension fault diagnosis device corresponds to the various steps in the above-mentioned air suspension fault diagnosis method embodiment, and its functions and implementation processes are no longer repeated here one by one.

[0155] In a third aspect, an embodiment of the present application provides an air suspension fault diagnosis device, which may be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0156] Figure 4 A schematic diagram of the hardware structure of the air suspension fault diagnosis device involved in the embodiment of the present application is shown.

[0157] Reference Figure 4 In an embodiment of the present application, the air suspension fault diagnosis device may include a processor, a memory, a communication interface, and a communication bus.

[0158] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0159] The communication interface includes an input / output (I / O) interface, a physical interface, and a logical interface, etc., which are used to interconnect the devices inside the air suspension fault diagnosis device, and an interface used to interconnect the air suspension fault diagnosis device with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, an optical fiber interface, an ATM interface, etc.; the user device can be a display, a keyboard, etc.

[0160] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0161] The processor may be a general-purpose processor, and the general-purpose processor may call the air suspension fault diagnosis program stored in the memory and execute the air suspension fault diagnosis method provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the air suspension fault diagnosis program is called may refer to the various embodiments of the air suspension fault diagnosis method of the present application, which will not be repeated here.

[0162] Those skilled in the art will understand that Figure 4 The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0163] In a fourth aspect, an embodiment of the present application also provides a readable storage medium.

[0164] An air suspension fault diagnosis program is stored on a readable storage medium of the present application, wherein when the air suspension fault diagnosis program is executed by a processor, the steps of the air suspension fault diagnosis method as described above are implemented.

[0165] Among them, the method implemented when the air suspension fault diagnosis program is executed can refer to the various embodiments of the air suspension fault diagnosis method of the present application, and will not be repeated here.

[0166] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0167] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0168] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0169] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0170] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0171] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0172] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for diagnosing air suspension faults, characterized in that: The air suspension fault diagnosis method comprises: During the process of the air pump inflating the target object, monitoring the change of the first target parameter, wherein the first target parameter at least includes the pressure of the air pipeline where the air pump and the target object are located; If the change of the first target parameter meets the first condition, the air pipeline between the air pump and the target object is cut off, and the change of the second target parameter is monitored, wherein the second target parameter at least includes the pressure of the air pipeline where the air pump is located; The reason why the air pump inflates the target object abnormally is determined according to the change of the second target parameter.

2. The air suspension fault diagnosis method according to claim 1, characterized in that: The target object is an air spring, and the first target parameter includes the pressure of the air pipeline where the air pump and the air spring are located and the height of the air spring; The step of monitoring the change of the first target parameter comprises: When the inflation time reaches a first preset time, the pressure of the air pipeline where the air pump and the air spring are located is recorded as a first initial value, and the height of the air spring is recorded as a second initial value; The difference between the pressure of the air pipeline where the air pump and the air spring are located and the first initial value is calculated in real time to obtain a first real-time difference, and the difference between the height of the air spring and the second initial value is calculated in real time to obtain a second real-time difference; The first condition includes: at each moment within the second preset time length, the absolute value of the first real-time difference is less than the first threshold, and the absolute value of the second real-time difference is less than the second threshold.

3. The air suspension fault diagnosis method according to claim 2, characterized in that: The second target parameter includes the pressure of the air line where the air pump is located; The step of monitoring the change of the second target parameter comprises: When the air pipeline between the air pump and the air spring is cut off, the pressure of the air pipeline where the air pump is located is recorded as the third initial value; Calculate in real time the difference between the pressure of the air pipeline where the air pump is located and the third initial value to obtain a third real-time difference value; The step of determining the reason why the air pump inflates the target object abnormally according to the change of the second target parameter comprises: If the change of the second target parameter meets the second condition, it is determined that the air pump and its power supply line are broken, and the second condition includes: at each moment within the third preset time length, the absolute value of the third real-time difference is less than the third threshold value; If the change in the second target parameter meets the third condition, it is determined that the air spring or its air pipeline is leaking. The third condition includes: at any time within a third preset time period, the absolute value of the third real-time difference is greater than or equal to a third threshold.

4. The air suspension fault diagnosis method according to claim 1, characterized in that: The target object is an air tank, and the first target parameter includes the pressure of the air pipeline where the air pump and the air tank are located; The step of monitoring the change of the first target parameter comprises: When the inflation time reaches a fourth preset time, the pressure of the air pipeline where the air pump and the air storage tank are located is recorded as a fourth initial value; The difference between the pressure of the air pipeline where the air pump and the air storage tank are located and the fourth initial value is calculated in real time to obtain a fourth real-time difference value; The first condition includes: at each moment within the fifth preset time length, the absolute value of the fourth real-time difference is less than the fourth threshold.

5. The air suspension fault diagnosis method according to claim 4, characterized in that: The second target parameter includes the pressure of the air line where the air pump is located; The step of monitoring the change of the second target parameter comprises: When the air pipeline between the air pump and the air storage tank is cut off, the pressure of the air pipeline where the air pump is located is recorded as the fifth initial value; Calculate in real time the difference between the pressure of the air line where the air pump is located and the fifth initial value to obtain a fifth real-time difference value; The step of determining the reason why the air pump inflates the target object abnormally according to the change of the second target parameter comprises: If the change of the second target parameter meets the fourth condition, it is determined that the air pump and its power supply line are broken, and the fourth condition includes: at each moment within the sixth preset time length, the absolute value of the fifth real-time difference is less than the fifth threshold value; If the change in the second target parameter meets the fifth condition, it is determined that the air tank or its air pipeline is leaking, and the fifth condition includes: at any time within the sixth preset time period, the absolute value of the fifth real-time difference is greater than or equal to the fifth threshold.

6. The air suspension fault diagnosis method according to any one of claims 1 to 5, characterized in that: When the air pump is inflating the target object, the pressure of the air pipeline where the air pump and the target object are located is measured by the pressure sensor in the air distribution valve; The step of isolating the air pipeline between the air pump and the target object comprises: Close the valve of the target object in the air distribution valve to measure the pressure of the air line where the air pump is located through the pressure sensor in the air distribution valve.

7. The air suspension fault diagnosis method according to any one of claims 1 to 5, characterized in that: The air suspension fault diagnosis method further includes: monitoring the pressure of the air line where the air pump is located when no request for the air pump to inflate any object is detected; If the pressure of the air pipeline where the air pump is located is greater than or equal to the sixth threshold value, it is determined that the air pump and its power supply circuit are short-circuited.

8. An air suspension fault diagnosis device, characterized in that: The air suspension fault diagnosis device comprises: A first monitoring module, used for monitoring changes in a first target parameter during the process of the air pump inflating the target object, wherein the first target parameter at least includes the pressure of the air pipeline where the air pump and the target object are located; A second monitoring module is used for isolating the air pipeline between the air pump and the target object if the change of the first target parameter meets the first condition, and monitoring the change of the second target parameter, wherein the second target parameter at least includes the pressure of the air pipeline where the air pump is located; The cause determination module is used to determine the cause of abnormal inflation of the target object by the air pump according to the change of the second target parameter.

9. An air suspension fault diagnosis device, characterized in that: The air suspension fault diagnosis device includes a processor, a memory, and an air suspension fault diagnosis program stored in the memory and executable by the processor, wherein when the air suspension fault diagnosis program is executed by the processor, the steps of the air suspension fault diagnosis method as described in any one of claims 1 to 7 are implemented.

10. A readable storage medium, characterized in that: An air suspension fault diagnosis program is stored on the readable storage medium, wherein when the air suspension fault diagnosis program is executed by the processor, the steps of the air suspension fault diagnosis method according to any one of claims 1 to 7 are implemented.

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