Air spring strut fault detection method and device, and electronic controller

Abstract

The invention provides an air spring strut fault detection method and device, and an electronic controller. The air spring strut fault detection method comprises the following steps: obtaining a height adjustment instruction of an air spring strut; when the height adjusting instructions of the two air spring supporting columns of the first shaft are both ascending or descending, the adjusting time of the two air spring supporting columns of the first shaft is obtained; whether the two air spring struts of the first shaft leak air seriously or the strut valve cannot be opened normally is detected according to whether the adjusting time exceeds the preset time. According to the method, the detection process is simple, fault detection can be completed in the normal height adjusting process, dependence on special scenes is not needed, the situation that the strut valve cannot be normally opened due to clamping stagnation can be diagnosed through the detection method, the application range is wide, implementation is high, and additional sensors do not need to be additionally installed.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle suspension systems, and in particular to an air spring strut fault detection method and device, and an electronic controller. Background Art

[0002] For vehicles equipped with air suspension, the height of the vehicle body can be raised or lowered by inflating and deflating the air spring strut. If a mechanical failure occurs in the air spring strut, the vehicle may not be able to adjust to the target height as required, or even cause an unexpected vehicle body posture. Therefore, it is necessary to detect air spring strut failures and prompt users so that the air spring struts can be repaired and replaced as soon as possible. Mechanical failures of air spring struts include air bag leakage and sticking of the strut valve. Cracking of the air bag rubber can cause air bag leakage. Particles larger than 600μm in the air can cause the valve core to become clogged, causing the strut valve to fail to open or close normally. Existing detection methods generally do not take into account the situation of stuck strut valves, and therefore the detection results are not accurate enough. Summary of the invention

[0003] In view of the above defects of the prior art, the present invention provides an air spring strut fault detection method and device, and an electronic controller to solve the technical problem of inaccurate air spring strut fault detection.

[0004] To achieve the above-mentioned purpose and other related purposes, the present invention provides an air spring strut fault detection method, comprising the following steps: obtaining a height adjustment instruction of the air spring strut; when the height adjustment instructions of the two air spring struts of the first axis are both rising or both falling, obtaining the adjustment time of the two air spring struts of the first axis; and detecting whether the two air spring struts of the first axis have serious air leakage or a fault in which the strut valve cannot open normally, based on whether the adjustment time exceeds a preset time.

[0005] In one embodiment of the present invention, the step of obtaining the adjustment time of the two air spring struts of the first shaft includes: obtaining the first adjustment time of the left air spring strut and the second adjustment time of the right air spring strut of the first shaft; detecting whether the two air spring struts of the first shaft have serious leakage or the strut valves cannot open normally based on whether the adjustment time exceeds the preset time, including: detecting whether the two air spring struts of the first shaft have serious leakage or the strut valves cannot open normally based on the size relationship between the first adjustment time and the first preset time, and the size relationship between the second adjustment time and the second preset time.

[0006] In one embodiment of the present invention, based on the size relationship between the first adjustment time and the first preset time, as well as the size relationship between the second adjustment time and the second preset time, it is detected whether the two air spring struts of the first shaft have serious leakage or the strut valve cannot open normally, including: when the first adjustment time is greater than the first preset time and the second adjustment time is less than or equal to the second preset time, the left air spring strut of the first shaft has serious leakage or the strut valve cannot open normally; when the second adjustment time is greater than the second preset time and the first adjustment time is less than or equal to the first preset time, the right air spring strut of the first shaft has serious leakage or the strut valve cannot open normally.

[0007] In one embodiment of the present invention, the step of obtaining the height adjustment instruction of the air spring strut also includes: when the air spring strut of the first axis is in the height adjustment process and the air spring strut of the second axis is not in the height adjustment process, obtaining the height change of the air spring strut of the second axis; and detecting whether the air spring strut of the second axis has a fault in which the strut valve cannot be closed normally based on whether the height change exceeds a preset height change.

[0008] In one embodiment of the present invention, the step of obtaining the height change of the air spring strut of the second shaft includes: obtaining a first height change of the left air spring strut and a second height change of the right air spring strut of the second shaft; detecting whether the air spring strut of the second shaft has a fault that the strut valve cannot be closed normally based on whether the height change exceeds a preset height change, including: detecting whether the air spring strut of the second shaft has a fault that the strut valve cannot be closed normally based on the size relationship between the first height change and the first preset height change, and the size relationship between the second height change and the second preset height change.

[0009] In one embodiment of the present invention, based on the magnitude relationship between the first height change and the first preset height change, as well as the magnitude relationship between the second height change and the second preset height change, it is detected whether the air spring strut of the second shaft has a fault in which the strut valve cannot be closed normally, including: when the first height change is greater than the first preset height change, the left air spring strut of the second shaft has a fault in which the strut valve cannot be closed normally; when the second height change is greater than the second preset height change, the right air spring strut of the second shaft has a fault in which the strut valve cannot be closed normally.

[0010] In one embodiment of the present invention, the step of obtaining the height adjustment instruction of the air spring strut includes: determining whether a component in the air spring system is in a faulty state; when the component in the air spring system is not faulty, determining whether the vehicle is in a driving condition; when the vehicle is in a driving condition, determining whether the vehicle enters a height adjustment process; when the vehicle enters a height adjustment process, obtaining the height adjustment instruction of the air spring strut.

[0011] In one embodiment of the present invention, the components in the air spring system include a height sensor, an air tank valve, a strut valve, an exhaust valve, a relay, and a temperature sensor.

[0012] To achieve the above-mentioned purpose and other related purposes, the present invention also provides an air spring strut fault detection method, comprising the following steps: obtaining a height adjustment instruction of the air spring strut; when the air spring strut of the first axis is in the height adjustment process and the air spring strut of the second axis is not in the height adjustment process, obtaining the height change of the air spring strut of the second axis; and detecting whether the air spring strut of the second axis has a fault in which the strut valve cannot be closed normally, based on whether the height change exceeds a preset height change.

[0013] In one embodiment of the present invention, the step of obtaining the height adjustment instruction of the air spring strut includes: determining whether a component in the air spring system is in a faulty state; when the component in the air spring system is not faulty, determining whether the vehicle is in a driving condition; when the vehicle is in a driving condition, determining whether the vehicle enters a height adjustment process; when the vehicle enters a height adjustment process, obtaining the height adjustment instruction of the air spring strut.

[0014] In one embodiment of the present invention, the components in the air spring system include a height sensor, an air tank valve, a strut valve, an exhaust valve, a relay, and a temperature sensor. To achieve the above purpose and other related purposes, the present invention also provides a fault detection device for an air spring strut, including: an instruction acquisition unit for acquiring a height adjustment instruction of the air spring strut; an instruction judgment unit for judging whether the height adjustment instructions of the two air spring struts of the first axis are both rising or both falling; a time acquisition unit for acquiring the adjustment time of the two air spring struts of the first axis; and a fault analysis unit for detecting whether the two air spring struts of the first axis have serious air leakage or a fault that the strut valve cannot open normally, based on whether the adjustment time exceeds a preset time.

[0015] To achieve the above-mentioned purpose and other related purposes, the present invention also provides an electronic controller, including a processor, a memory and a communication bus; the communication bus is used to connect the processor and the memory; the processor is used to execute a computer program stored in the memory to implement the air spring strut fault detection method as described above.

[0016] Beneficial effects of the present invention: The present invention proposes an air spring strut fault detection method and device, and an electronic controller. The method has a simple detection process and can complete fault detection during the normal height adjustment process without relying on special scenarios. In addition, the detection method can diagnose the situation where the strut valve cannot open normally due to sticking. It has a wide range of applications, strong feasibility, and does not require the installation of additional sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A flow chart of a first fault detection method provided by an embodiment of the present invention;

[0019] Figure 2 A flowchart of performing a first fault detection provided by an embodiment of the present invention;

[0020] Figure 3 A flow chart of a second fault detection method provided by an embodiment of the present invention;

[0021] Figure 4 A flowchart of performing a second fault detection provided by an embodiment of the present invention;

[0022] Figure 5 A flowchart of obtaining a height adjustment instruction provided by an embodiment of the present invention;

[0023] Figure 6 A flowchart of component fault determination in an air spring system provided by an embodiment of the present invention;

[0024] Figure 7 A flow chart of a third fault detection method provided by an embodiment of the present invention;

[0025] Figure 8 A flow chart of a fourth fault detection method provided by an embodiment of the present invention;

[0026] Fig. 9A structural diagram of a fault detection device provided in one embodiment of the present invention.

[0027] Description of the accompanying drawings: 100, instruction acquisition unit; 200, instruction judgment unit; 300, time acquisition unit; 400, fault analysis unit. DETAILED DESCRIPTION

[0028] The following describes the embodiments of the present invention through specific specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. It should be noted that the following embodiments and the features in the embodiments can be combined with each other without conflict. In addition to the specific methods, equipment, and materials used in the embodiments, according to the technical personnel in this technical field's grasp of the prior art and the records of the present invention, any methods, equipment, and materials of the prior art that are similar or equivalent to the methods, equipment, and materials described in the embodiments of the present invention can also be used to implement the present invention.

[0029] It should be understood that the terms used in the embodiments of the present invention are for describing specific embodiments rather than for limiting the scope of protection of the present invention. Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those generally understood by those skilled in the art.

[0030] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In some of the embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0031] The flowchart and block diagram in the accompanying drawings illustrate the system architecture, functions and operations that may be implemented according to the methods and computer program products of various embodiments disclosed in the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment, or a part of a code, and the module, the program segment, or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of the boxes in the block diagram and / or the flowchart can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0032] The air spring system is an advanced automobile suspension system that uses the compressibility of compressed air in a sealed container to achieve elasticity, thereby providing support and cushioning functions for the vehicle. The core component of the air spring system is the air spring strut, which usually consists of a flexible sealed container and compressed air filled in it. This design gives the air spring strut a nonlinear elastic characteristic, which can adjust its own stiffness according to different load conditions, thereby maintaining a constant height of the vehicle body and not being affected by load increases or decreases. In addition, the air spring system includes many other components. The air spring system can provide better ride comfort and passability, and help improve the overall performance and intelligence level of the vehicle. In general, the air spring system is a complex but efficient automobile suspension solution that provides vehicles with excellent performance and a comfortable driving experience through precise control and adjustment.

[0033] In the following, some parameters are involved, which are described here uniformly:

[0034] FL: corresponds to the left air spring strut of the front axle, referred to as the left front strut;

[0035] FR: corresponds to the right air spring strut of the front axle, referred to as the right front strut;

[0036] RL: corresponds to the left air spring strut of the rear axle, referred to as the left rear strut;

[0037] RR: corresponds to the right air spring strut of the rear axle, referred to as the right rear strut;

[0038] T: represents the adjustment time. T plus the subscript corresponds to the adjustment time of a certain pillar, for example, T FL The adjustment time for the left front support;

[0039] h: indicates the real-time height. h plus the subscript corresponds to the real-time height of a pillar, for example h RL is the real-time height of the left rear pillar.

[0040] For a more concise description, the present invention mentions a first fault detection and a second fault detection, wherein the first fault detection is to detect whether the air spring strut has a serious air leakage or a fault in which the strut valve cannot open normally; the second fault detection is to detect whether the air spring strut has a fault in which the strut valve cannot close normally.

[0041] See also Figure 1 , Figure 1 An air spring strut fault detection method provided in one embodiment of the present invention includes steps S100 to S300, which are described in detail below.

[0042] Step S100, obtaining a height adjustment instruction for the air spring strut. In this embodiment, the fault detection of the air spring strut is performed when the vehicle enters the height adjustment process, so the fault detection of the air spring strut is performed only when the vehicle enters the ascending or descending mode, that is, after receiving the height adjustment instruction for the air spring strut.

[0043] For example, in one embodiment, the height of the vehicle is adjusted according to the following process. If the vehicle height is raised, the height of the two air spring struts of the rear axle will be raised at the same time, and when the height of the two air spring struts of the rear axle reaches the target height, the height of the two air spring struts of the front axle will be raised at the same time; if the vehicle height is lowered, the height of the two air spring struts of the front axle will be lowered at the same time, and then the height of the two air spring struts of the rear axle will be lowered at the same time.

[0044] Step S200: When the height adjustment instructions of the two air spring struts of the first axis are both rising or both falling, the adjustment time of the two air spring struts of the first axis is obtained. The first axis here can be the front axle of the vehicle or the rear axle of the vehicle. The first axis is just a synonym for conveniently describing which air spring strut is specifically targeted for fault detection later.

[0045] Taking the front axle of the vehicle as the first axle as an example, step S200 specifically includes: when the height adjustment instructions of the two air spring struts of the front axle are both rising or both falling, the adjustment time of the two air spring struts of the front axle is obtained. Taking the rear axle of the vehicle as the first axle as an example, step S200 specifically includes: when the height adjustment instructions of the two air spring struts of the rear axle are both rising or both falling, the adjustment time of the two air spring struts of the rear axle is obtained.

[0046] The process of performing the first fault detection on the front axle or the rear axle is independent. In the adjustment process of the air spring struts described above, the air spring struts of the front and rear axles will not be height-adjusted at the same time. However, in some other schemes, the height of both the front and rear axles may be adjusted at the same time. In this case, the first fault detection of the front axle and the first fault detection of the rear axle can be performed simultaneously.

[0047] It is understandable that two air spring struts are generally provided on the front axle or rear axle of a vehicle, namely, a left air spring strut and a right air spring strut. For some vehicles, more air spring struts may be provided, such as multiple air spring struts on one side. In this case, the one air spring strut mentioned in step S200 may be equivalent to multiple air spring struts on the same side.

[0048] It can be understood that the adjustment time of the air spring strut refers to the time from the start of adjustment of the air spring strut to the time when it is adjusted to the target height.

[0049] Step S300, based on whether the adjustment time exceeds the preset time, detect whether the two air spring struts of the first axis have serious air leakage or the strut valve cannot open normally, that is, perform the first fault detection. The first axis here is also just a synonym to clarify which air spring strut step S300 is specifically for the first fault detection. It corresponds to step S200. If the adjustment time of the two air spring struts of the front axle is obtained in step S200, then step S300 is naturally also the first fault detection for the two air spring struts of the front axle, and the same applies to the rear axle. When the air spring strut is fault-free, its adjustment time should be basically fixed for the same height. Therefore, the adjustment time of the air spring strut can directly reflect whether it has a fault, so in this step, the first fault detection is performed based on the adjustment time.

[0050] The first fault detection in this embodiment and the second fault detection in the following embodiments are both used to detect the stuck condition of the strut valve of the air spring strut, and they are different from other fault detections in the prior art (such as air bag leakage detection). Specifically, the first fault detection is for detecting the fault that the strut valve cannot open normally in the stuck state of the strut valve, and the second fault detection is for detecting the fault that the strut valve cannot close normally in the stuck state of the strut valve. For these two fault detections, only one of the faults can be detected, such as the present embodiment only detecting the first fault, or Figure 7 The embodiment shown only detects the second fault; it is also possible to detect both faults at the same time, such as Figure 3 The embodiment shown.

[0051] In a specific embodiment of the present invention, the step of obtaining the adjustment time of the two air spring struts of the first shaft includes: obtaining the first adjustment time of the left air spring strut of the first shaft and the second adjustment time of the right air spring strut. For example, taking the front shaft as an example, the first adjustment time of the left air spring strut of the front shaft can be recorded as T FL The second adjustment time of the right air spring strut of the front axle is recorded as T FR . Step S300 includes: according to the size relationship between the first adjustment time and the first preset time, as well as the size relationship between the second adjustment time and the second preset time, detecting whether the two air spring struts of the first axis have serious air leakage or the strut valve cannot open normally. The first preset time and the second preset time are respectively the maximum adjustment times allowed for the air spring struts on both sides. The first preset time and the second preset time can be set to different values, and the first preset time can also be equal to the second preset time. For example, in a specific embodiment of the present invention, the first preset time and the second preset time are equal and recorded as A. Then, in this step, it is determined by judging T FLThe relationship between A and T FR The first fault detection is performed based on the relationship between A and R.

[0052] See also Figure 2 In a specific embodiment of the present invention, step S300 includes: S301, when the first adjustment time is greater than the first preset time and the second adjustment time is less than or equal to the second preset time, the left air spring strut of the first shaft has a serious leakage or the strut valve cannot open normally; S302, when the second adjustment time is greater than the second preset time and the first adjustment time is less than or equal to the first preset time, the right air spring strut of the first shaft has a serious leakage or the strut valve cannot open normally. Taking the front shaft above as an example, when T FL >A and T FR ≤A, it means that the adjustment time of the left air spring strut is too long, there is a serious leakage or the strut valve cannot open normally; when T FR >A and T FL When ≤A, it means that the adjustment time of the right air spring strut is too long, there is a serious air leakage or the strut valve cannot open normally.

[0053] Understandably, when T FL ≤A and T FR When ≤A, it means that the left and right air spring struts of the front axle are normal and have no faults. Generally speaking, T rarely occurs. FL >A and T FR >A: When this happens, the fault generally comes from other components of the air spring system, rather than the air spring strut. Therefore, in the above step S300, only two of the conditions are judged for fault.

[0054] See also Figure 3 In a specific embodiment of the present invention, step S100 also includes step S400 and step S500. Figure 3 Step S400 and step S500 on the right side are mainly aimed at the situation that one axis has an adjustment instruction and the other axis has no adjustment instruction, but the height change of the other axis exceeds a preset range.

[0055] Step S400, when the air spring strut of the first axis is in the process of height adjustment and the air spring strut of the second axis is not in the process of height adjustment, obtain the height change of the air spring strut of the second axis. The first axis and the second axis here are also a synonym. When the first axis is the front axle of the vehicle, the second axis is the rear axle of the vehicle; similarly, when the first axis is the rear axle of the vehicle, the second axis is the front axle of the vehicle. So step S400 actually includes two solutions:

[0056] Solution 1: when the air spring strut of the front axle is in the process of height adjustment and the air spring strut of the rear axle is not in the process of height adjustment, obtaining the height change of the air spring strut of the rear axle;

[0057] Solution 2: when the air spring strut of the rear axle is in the process of height adjustment and the air spring strut of the front axle is not in the process of height adjustment, the height change of the air spring strut of the front axle is obtained.

[0058] In step S400, it is mainly to check whether the second shaft will produce abnormal height change when the first shaft is height-adjusted. Therefore, when the relevant conditions are met, the height change of the air spring strut of the second shaft is directly obtained.

[0059] Step S500, based on whether the height change exceeds the preset height change, detect whether the air spring strut of the second axis has a fault that the strut valve cannot be closed normally. The second axis here is also just a synonym to clarify which air spring strut step S500 is specifically for the second fault detection. Generally speaking, when the air spring strut of the front axle is adjusted, the height of the air spring strut of the rear axle should not change significantly. Therefore, the height change of the rear axle directly reflects whether the air spring strut has a fault, so in this step, the second fault detection is performed based on the height change.

[0060] It should be noted that step S200 and step S300 correspond to the first fault detection process, and step S400 and step S500 correspond to the second fault detection process, and the two are independent of each other. From the execution order, the first fault detection process can be executed before the second fault detection process, or after the second fault detection process, or at the same time as the second fault detection process (for example, the two processes are executed in a multi-threaded manner), and even the first fault detection process and the second fault detection process can be interspersed.

[0061] In a specific embodiment of the present invention, the step of obtaining the height change of the air spring strut of the second axis includes: obtaining a first height change of the left air spring strut and a second height change of the right air spring strut of the second axis. Generally speaking, a height sensor is provided in the air spring system to collect the height of the air spring strut, so the height change here is generally obtained by performing a difference calculation on the heights of the air spring struts at different times.

[0062] Taking the height change of the air spring strut of the rear axle as an example, the height h of the air spring strut on the left side at the start of the rear axle height adjustment can be obtained first. RL1 and the height h of the right air spring strut RR1 , and then obtain the real-time height h of the left air spring strut of the rear axle RLand the real-time height h of the right air spring strut RR , then the first height change Δh of the left air spring strut of the rear axle RL =abs(h RL -h RL1 ), the second height change Δh of the right air spring strut of the rear axle RR =abs(h RR -h RR1 ), where abs() is used to find the absolute value.

[0063] Step S500 includes: according to the magnitude relationship between the first height change and the first preset height change, and the magnitude relationship between the second height change and the second preset height change, detecting whether the air spring strut of the second axis has a fault that the strut valve cannot be closed normally. The first preset height change and the second preset height change are the maximum allowable height change ranges of the air spring struts on both sides. Similarly, the two can be set to different values ​​or the same value. For example, in a specific embodiment of the present invention, the first preset height change is equal to the second preset height change and is recorded as B. Then in step S500, by judging Δh RL The relationship between the size of B and Δh RR The second fault detection is carried out based on the size relationship between A and B.

[0064] See also Figure 4 In a specific embodiment of the present invention, step S500 includes: S501, when the first height change is greater than the first preset height change, the left air spring strut of the second shaft has a fault that the strut valve cannot be closed normally; S502, when the second height change is greater than the second preset height change, the right air spring strut of the second shaft has a fault that the strut valve cannot be closed normally. Taking the rear axle above as an example: when Δh RL >B, it means that the left air spring strut of the rear axle has a fault that the strut valve cannot be closed normally; when Δh RR >B, it means that the right air spring strut of the rear axle has a fault that the strut valve cannot be closed normally. Different from the first fault detection, which determines the adjustment time of the air spring struts on both sides at the same time, the second fault detection determines the height change of the air spring struts on both sides separately. It can be understood that when Δh RL ≤B, indicating that the left air spring strut of the rear axle is fault-free. RR When ≤B, it indicates that there is no fault in the right air spring strut of the rear axle.

[0065] See also Figure 5In order to more accurately determine the failure of the air spring strut, some other factors that affect the adjustment time and height change of the air spring strut should be eliminated. In a specific embodiment of the present invention, step S100 includes steps S110 to S140.

[0066] Step S110, determine whether the components in the air spring system are in a faulty state. The present invention mainly detects the fault of the air spring strut itself, so some other factors that may affect the action of the air spring strut are eliminated, which can improve the reliability of fault detection.

[0067] See also Figure 6 In a specific embodiment of the present invention, the components in the air spring system may include, for example, a height sensor, an air tank valve, a strut valve, an exhaust valve, a relay, and a temperature sensor. Taking these components as an example, step S110 includes: S111, judging whether there are electrical and rationality faults in the height sensor in the air spring system; S112, judging whether there are electrical faults in the air tank valve, the strut valve, the exhaust valve, the relay, and the temperature sensor in the air spring system. It can be understood that when these faults occur, the adjustment time or height change of the air spring strut will be affected, so the fault detection based on these two parameters will inevitably be affected. Therefore, in step S110, these faults are first eliminated. If any of these faults exists, the air spring strut is not detected for faults.

[0068] Electrical failures usually refer to damage to the power supply, circuit itself, or components (i.e. the various sensors, valves, relays, etc. mentioned above). Rational failures refer to problems that occur during the design, installation, or operation process due to non-compliance with scientific principles or engineering practices. Such failures may involve improper system design, human operating errors, insufficient maintenance, or the use of inappropriate materials and technologies.

[0069] Step S120: When there is no fault in the components of the air spring system, determine whether the vehicle is in a driving condition. The reason why it is necessary to determine whether the vehicle is in a driving condition is that when the vehicle is in a stationary condition, foreign objects above or below the vehicle may cause the height adjustment of the air spring strut to fail, and in this case, the fault detection of the air spring strut cannot be performed.

[0070] Step S130: When the vehicle is in a driving condition, determine whether the vehicle enters a height adjustment process. Since the air spring strut detection process in the present invention is performed during the air spring strut adjustment process, it is necessary to determine whether the vehicle enters a height adjustment process. If the vehicle does not enter a height adjustment process, the air spring strut fault diagnosis cannot be performed.

[0071] Step S140: When the vehicle enters the height adjustment process, a height adjustment instruction of the air spring strut is obtained.

[0072] It can be understood that when the prerequisites of step S120, step S130, and step S140 are not met, the process can return to step S110 and make another judgment until all conditions are met. Then, the height adjustment instruction of the air spring strut can be obtained and subsequent fault detection can be performed.

[0073] See also Figure 7 , Figure 7 An air spring strut fault detection method provided for one embodiment of the present invention includes the above-mentioned step S100, step S400 and step S500. According to the above description, step S200 and step S300 correspond to the first fault detection, and step S400 and step S500 correspond to the second fault detection. These two fault detections belong to two different branches, and each branch can be used as an independent solution. In this embodiment, only the second fault detection is performed on the air spring strut, that is, only the second fault detection is performed on the strut valve of the air spring strut. The specific implementation methods of step S400 and step S500 can be referred to the above description, which will not be repeated here.

[0074] exist Figure 7 On the basis of the embodiments of the present invention, in other embodiments of the present invention, step S100 may also specifically include all the detailed contents of the above steps S110 to S140. For example, step S100 includes: judging whether the components in the air spring system are in a faulty state; when the components in the air spring system are not faulty, judging whether the vehicle is in a driving condition; when the vehicle is in a driving condition, judging whether the vehicle enters a height adjustment process; when the vehicle enters a height adjustment process, obtaining a height adjustment instruction for the air spring strut. Among them, the components in the air spring system include a height sensor, an air tank valve, a strut valve, an exhaust valve, a relay, and a temperature sensor, as well as the specific detection contents of these components. To avoid repetition, it will not be expanded here.

[0075] See also Figure 8 , Figure 8 A fourth fault detection method flow chart provided for an embodiment of the present invention is an embodiment that includes all the steps in the above embodiments. Since the entire flow chart is relatively large, some of the text is abbreviated. From this figure, a very complete process for fault detection of an air spring strut can be seen.

[0076] It should be noted that the step division of the above methods is only for clear description. When implemented, they can be combined into one step or some steps can be split and decomposed into multiple steps. As long as they contain the same logical relationship, they are all within the scope of protection of this patent; adding insignificant modifications to the algorithm or process or introducing insignificant designs without changing the core design of the algorithm and process are all within the scope of protection of this patent.

[0077] See also Fig. 9 , Fig. 9 An air spring strut fault detection device provided in one embodiment of the present invention includes an instruction acquisition unit 100, an instruction judgment unit 200, a time acquisition unit 300 and a fault analysis unit 400. The instruction acquisition unit 100 is used to acquire the height adjustment instruction of the air spring strut; the instruction judgment unit 200 is used to determine whether the height adjustment instructions of the two air spring struts of the first axis are both rising or both falling; the time acquisition unit 300 is used to acquire the adjustment time of the two air spring struts of the first axis; the fault analysis unit 400 is used to detect whether the two air spring struts of the first axis have serious leakage or the strut valve cannot open normally according to whether the adjustment time exceeds the preset time.

[0078] It should be noted that the air spring strut fault detection device of the present embodiment is a device corresponding to the above-mentioned air spring strut fault detection method, and the functional modules in the air spring strut fault detection device may correspond to the corresponding steps in the air spring strut fault detection method. The air spring strut fault detection device of the present embodiment can be implemented in conjunction with the air spring strut fault detection method, that is, in the absence of conflict, the relevant technical details mentioned in the air spring strut fault detection method of the above-mentioned embodiments can also be applied to the air spring strut fault detection device.

[0079] An embodiment of the present invention also provides an electronic controller, including a processor, a memory and a communication bus; the communication bus is used to connect the processor and the memory; the processor is used to execute a computer program stored in the memory to implement the air spring strut fault detection method in any of the above embodiments.

[0080] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for detecting air spring strut faults, characterized in that: The steps include: Get the height adjustment command of the air spring strut; When the height adjustment instructions of the two air spring struts of the first shaft are both rising or both falling, obtaining the adjustment time of the two air spring struts of the first shaft; According to whether the adjustment time exceeds the preset time, it is detected whether the two air spring struts of the first shaft have serious air leakage or the strut valve cannot open normally.

2. The air spring strut fault detection method according to claim 1, characterized in that: The step of obtaining the adjustment time of the two air spring struts of the first shaft comprises: Obtaining a first adjustment time of a left air spring strut and a second adjustment time of a right air spring strut of the first shaft; According to whether the adjustment time exceeds the preset time, detecting whether the two air spring struts of the first shaft have serious air leakage or a fault in which the strut valve cannot open normally includes: According to the relationship between the first adjustment time and the first preset time, and the relationship between the second adjustment time and the second preset time, it is detected whether the two air spring struts of the first shaft have serious leakage or the strut valve cannot open normally.

3. The air spring strut fault detection method according to claim 2, characterized in that: According to the magnitude relationship between the first adjustment time and the first preset time, and the magnitude relationship between the second adjustment time and the second preset time, detecting whether the two air spring struts of the first shaft have serious air leakage or a fault in which the strut valve cannot open normally includes: When the first adjustment time is greater than the first preset time and the second adjustment time is less than or equal to the second preset time, the left air spring strut of the first shaft has a serious air leakage or the strut valve cannot open normally; When the second adjustment time is greater than the second preset time and the first adjustment time is less than or equal to the first preset time, the right air spring strut of the first shaft has a serious air leakage or the strut valve cannot open normally.

4. The air spring strut fault detection method according to claim 1, characterized in that: The step of obtaining the height adjustment instruction of the air spring strut also includes: When the air spring strut of the first shaft is in the process of height adjustment and the air spring strut of the second shaft is not in the process of height adjustment, obtaining a height change of the air spring strut of the second shaft; Whether the height change exceeds a preset height change is detected to determine whether the air spring strut of the second shaft has a failure in which the strut valve cannot be closed normally.

5. The air spring strut fault detection method according to claim 4, characterized in that: The step of obtaining the height change of the air spring strut of the second shaft comprises: Acquire a first height change of the left air spring strut and a second height change of the right air spring strut of the second shaft; Detecting whether there is a failure of the air spring strut of the second shaft that the strut valve cannot be closed normally according to whether the height change exceeds a preset height change, including: According to the magnitude relationship between the first height change and the first preset height change, and the magnitude relationship between the second height change and the second preset height change, it is detected whether the air spring strut of the second shaft has a fault in which the strut valve cannot be closed normally.

6. The air spring strut fault detection method according to claim 5, characterized in that: According to the magnitude relationship between the first height change and the first preset height change, and the magnitude relationship between the second height change and the second preset height change, detecting whether the air spring strut of the second shaft has a fault that the strut valve cannot be closed normally, including: When the first height change is greater than the first preset height change, a fault occurs in the left air spring strut of the second shaft, in which the strut valve cannot be closed normally; When the second height change is greater than the second preset height change, a right air spring strut of the second shaft has a fault in which the strut valve cannot be closed normally.

7. The air spring strut fault detection method according to claim 1, characterized in that: The step of obtaining the height adjustment instruction of the air spring strut comprises: Determine if a component in the air spring system is in a faulty state; When there is no fault in the components of the air spring system, determining whether the vehicle is in a driving condition; When the vehicle is in a driving condition, determining whether the vehicle enters a height adjustment process; When the vehicle enters a height adjustment process, a height adjustment instruction of the air spring strut is obtained.

8. The air spring strut fault detection method according to claim 7, characterized in that: Components in the air spring system include a height sensor, an air tank valve, a strut valve, an exhaust valve, a relay, and a temperature sensor.

9. A method for detecting air spring strut faults, characterized in that: The steps include: Get the height adjustment command of the air spring strut; When the air spring strut of the first shaft is in the process of height adjustment and the air spring strut of the second shaft is not in the process of height adjustment, obtaining a height change of the air spring strut of the second shaft; Whether the height change exceeds a preset height change is detected to determine whether the air spring strut of the second shaft has a failure in which the strut valve cannot be closed normally.

10. The air spring strut fault detection method according to claim 9, characterized in that: The step of obtaining the height adjustment instruction of the air spring strut comprises: Determine if a component in the air spring system is in a faulty state; When there is no fault in the components of the air spring system, determining whether the vehicle is in a driving condition; When the vehicle is in a driving condition, determining whether the vehicle enters a height adjustment process; When the vehicle enters a height adjustment process, a height adjustment instruction of the air spring strut is obtained.

11. The air spring strut fault detection method according to claim 10, characterized in that: Components in the air spring system include a height sensor, an air tank valve, a strut valve, an exhaust valve, a relay, and a temperature sensor.

12. A fault detection device for an air spring strut, characterized in that: include: An instruction acquisition unit, used for acquiring a height adjustment instruction of an air spring strut; An instruction judging unit, used for judging whether the height adjustment instructions of the two air spring struts of the first shaft are both rising or both falling; a time acquisition unit, used for acquiring the adjustment time of the two air spring struts of the first shaft; The fault analysis unit is used to detect whether the two air spring struts of the first shaft have serious leakage or the strut valve cannot open normally according to whether the adjustment time exceeds the preset time.

13. An electronic controller, characterized in that: It comprises a processor, a memory and a communication bus; the communication bus is used to connect the processor and the memory; the processor is used to execute the computer program stored in the memory to implement the air spring strut fault detection method as described in any one of claims 1 to 11.

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