Air spring underpressure diagnosis method, device and equipment and computer readable storage medium

Abstract

The invention discloses an air spring underpressure diagnosis method, device and equipment and a computer readable storage medium, and relates to the technical field of vehicle diagnos.The method comprises the steps that when a target air spring is in an exhaust working condition, when it is detected that the height reduction amount of the target air spring is smaller than a preset reduction amount threshold value, the target air spring is started; if yes, whether the target air spring is located at the lower limit position of the suspension stroke is determined based on the actual height of the target air spring; if the difference value between the historical height of the target air spring at the preset historical moment and the actual height is larger than a preset height difference threshold value, a target air spring distribution valve is controlled to be in an open state, and a pressure release valve and an air pump are controlled to be in a closed state, so that an air spring pressure value is obtained; and when the air spring pressure value is smaller than a preset under-pressure threshold value, it is judged that the target air spring is in an under-pressure state. By means of the air spring underpressure diagnosis method and device, the influence of abnormal work of the air spring distribution valve, the pressure release valve, the air spring pressure retaining valve and the like on air spring underpressure diagnosis can be effectively eliminated, and accurate diagnosis of air spring underpressure is achieved.

Description

Technical Field

[0001] The present application relates to the field of vehicle diagnosis technology, and in particular to an air spring underpressure diagnosis method, device, equipment and computer-readable storage medium. Background Art

[0002] In order to ensure the normal operation of the air spring system, it is usually necessary to control the pressure of the air spring system to be within the normal pressure range; among them, if the air spring pressure is too low, the air spring may fall out, and then damage the air spring hardware structure. Therefore, it is very necessary to diagnose the air spring underpressure.

[0003] In the related art, when realizing the diagnosis of the air spring underpressure, once it is detected that the height drop of the air spring during the lowering process is less than the preset drop threshold, an alarm of the air spring underpressure will be directly issued; because this scheme only performs height detection, and does not consider the influence of the working abnormalities of the distribution valve, the pressure relief valve and the air spring pressure maintaining valve on the air spring pressure, there is a possibility of misdiagnosis. It can be seen that how to realize the accurate diagnosis of the air spring underpressure is a problem that needs to be solved urgently. Summary of the invention

[0004] The present application provides an empty spring undervoltage diagnosis method, device, equipment and computer-readable storage medium, which can solve the technical problem of the inability to accurately diagnose empty spring undervoltage in the prior art.

[0005] In a first aspect, an embodiment of the present application provides an empty spring undervoltage diagnosis method, the empty spring undervoltage diagnosis method comprising:

[0006] When the target empty spring is in the exhaust condition, when it is detected that the height reduction amount of the target empty spring is less than a preset reduction amount threshold, it is determined whether the target empty spring is in the lower limit position of the suspension travel based on the actual height of the target empty spring;

[0007] If the difference between the historical height of the target empty spring at the preset historical moment and the actual height is greater than the preset height difference threshold, the target empty spring distribution valve is controlled to be in an open state and the pressure relief valve and the air pump are controlled to be in a closed state to obtain the empty spring pressure value;

[0008] When the empty spring pressure value is less than a preset underpressure threshold, it is determined that the target empty spring is in an underpressure state.

[0009] In combination with the first aspect, in one embodiment, after the step of determining whether the target empty spring is at the lower limit position of the suspension travel based on the actual height of the target empty spring, the method further includes:

[0010] If the target empty spring is at the lower limit position of the suspension travel and the difference between the historical height and the actual height is not greater than the height difference, the target empty spring distribution valve and the air pump are controlled to be in an open state to determine whether the height of the target empty spring rises;

[0011] If not, it is determined that the target air spring distribution valve is faulty;

[0012] If so, the target air spring distribution valve, air pump and pressure relief valve are opened and closed to control the target object to determine the fault diagnosis result of the target object according to the control result, and the target object includes the pressure relief valve and the target air spring pressure maintaining valve pipeline.

[0013] In combination with the first aspect, in one embodiment, the on-off control of the target air spring distribution valve, the air pump and the pressure relief valve is performed to determine the fault diagnosis result of the target object according to the control result, including:

[0014] Waiting for the pressure value in the target air spring to reach a preset pressure threshold, controlling the target air spring distribution valve and the air pump to be in a closed state, and controlling the pressure relief valve to be in an open state, so as to obtain the pipeline pressure value;

[0015] If the difference between the pipeline pressure value and the pressure threshold is less than a preset pressure difference threshold, it is determined that the pressure relief valve is faulty;

[0016] If the difference between the pipeline pressure value and the pressure threshold is not less than a preset pressure difference threshold, it is determined that there is a fault in the target air-spring pressure-maintaining valve pipeline.

[0017] In combination with the first aspect, in one embodiment, after the step of determining whether the target empty spring is at the lower limit position of the suspension travel based on the actual height of the target empty spring, the method further includes:

[0018] If the target empty spring is not at the lower limit position of the suspension stroke, the target empty spring distribution valve and the air pump are controlled to be in an open state and the step of determining whether the height of the target empty spring rises is performed.

[0019] In combination with the first aspect, in one embodiment, after the step of controlling the target empty spring distribution valve to be in an open state and the pressure relief valve and the air pump to be in a closed state to obtain the empty spring pressure value, the step further includes:

[0020] If the empty spring pressure value is not less than the underpressure threshold, it is determined that the target empty spring is in a non-underpressure state.

[0021] In combination with the first aspect, in one implementation, the method further includes:

[0022] When it is detected that the height reduction amount of the target empty spring is not less than the reduction amount threshold, obtaining the current pressure value of the target empty spring;

[0023] Determine whether the current pressure value is less than the undervoltage threshold,

[0024] If so, it is determined that the target empty spring is in an under-pressure state;

[0025] If not, it is determined that the target empty spring is in a non-underpressure state.

[0026] In combination with the first aspect, in one implementation, after the step of determining that the target empty spring is in an under-pressure state, the step further includes:

[0027] Controlling the air pump and the target empty spring distribution valve to be in an open state to replenish air to the target empty spring;

[0028] When the pressure in the target empty spring reaches a preset underpressure recovery threshold, the air replenishment operation is controlled to be in a stopped state so that the target empty spring is in a non-underpressure state.

[0029] In a second aspect, an embodiment of the present application provides an empty spring undervoltage diagnostic device, the empty spring undervoltage diagnostic device comprising:

[0030] a detection module, which is used to determine whether the target empty spring is at the lower limit position of the suspension travel based on the actual height of the target empty spring when it is detected that the height reduction amount of the target empty spring is less than a preset reduction amount threshold when the target empty spring is in the exhaust condition;

[0031] A control module, which is used to control the target empty spring distribution valve to be in an open state and the pressure relief valve and the air pump to be in a closed state, if the difference between the historical height of the target empty spring at a preset historical moment and the actual height is greater than a preset height difference threshold, so as to obtain the empty spring pressure value;

[0032] The diagnostic module is used to determine that the target empty spring is in an under-pressure state when the empty spring pressure value is less than a preset under-pressure threshold.

[0033] In combination with the second aspect, in one embodiment, the control module is also used to control the target air spring distribution valve and the air pump to be in an open state if the target air spring is at the lower limit position of the suspension stroke and the difference between the historical height and the actual height is not greater than the height difference, so as to determine whether the height of the target air spring has risen; the diagnostic module is also used to determine whether there is a fault in the target air spring distribution valve if not; if so, to control the opening and closing of the target air spring distribution valve, air pump and pressure relief valve to determine the fault diagnosis result of the target object according to the control result, and the target object includes the pressure relief valve and the target air spring pressure maintaining valve pipeline.

[0034] In conjunction with the second aspect, in one implementation, the diagnosis module is specifically used to:

[0035] Waiting for the pressure value in the target air spring to reach a preset pressure threshold, controlling the target air spring distribution valve and the air pump to be in a closed state, and controlling the pressure relief valve to be in an open state, so as to obtain the pipeline pressure value;

[0036] If the difference between the pipeline pressure value and the pressure threshold is less than a preset pressure difference threshold, it is determined that the pressure relief valve is faulty;

[0037] If the difference between the pipeline pressure value and the pressure threshold is not less than a preset pressure difference threshold, it is determined that there is a fault in the target air-spring pressure-maintaining valve pipeline.

[0038] In combination with the second aspect, in one embodiment, the control module is also used to: if the target empty spring is not at the lower limit position of the suspension travel, control the target empty spring distribution valve and the air pump to be in an open state and execute the step of determining whether the height of the target empty spring has risen.

[0039] In combination with the second aspect, in one implementation, the diagnostic module is further used to: if the empty spring pressure value is not less than the under-pressure threshold, determine that the target empty spring is in a non-under-pressure state.

[0040] In conjunction with the second aspect, in one implementation, the diagnosis module is further used for:

[0041] When it is detected that the height reduction amount of the target empty spring is not less than the reduction amount threshold, obtaining the current pressure value of the target empty spring;

[0042] Determine whether the current pressure value is less than the undervoltage threshold,

[0043] If so, it is determined that the target empty spring is in an under-pressure state;

[0044] If not, it is determined that the target empty spring is in a non-underpressure state.

[0045] In combination with the second aspect, in one implementation, the empty spring undervoltage diagnostic device further includes a recovery module, which is used to:

[0046] Controlling the air pump and the target empty spring distribution valve to be in an open state to replenish air to the target empty spring;

[0047] When the pressure in the target empty spring reaches a preset underpressure recovery threshold, the air replenishment operation is controlled to be in a stopped state so that the target empty spring is in a non-underpressure state.

[0048] In the third aspect, an embodiment of the present application provides an empty spring underpressure diagnostic device, which includes a processor, a memory, and an empty spring underpressure diagnostic program stored in the memory and executable by the processor, wherein when the empty spring underpressure diagnostic program is executed by the processor, the steps of the empty spring underpressure diagnostic method as described above are implemented.

[0049] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which is stored an empty spring underpressure diagnostic program, wherein when the empty spring underpressure diagnostic program is executed by a processor, the steps of the empty spring underpressure diagnostic method as described above are implemented.

[0050] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0051] When the target air spring is in the exhaust condition, firstly, the target air spring distribution valve, pressure relief valve, target air spring pressure maintaining valve pipeline and other objects are detected to see if there is any fault through the normal reduction of the target air spring height. That is, if the height reduction is less than the reduction threshold, it means that the above objects may have faults; then continue to determine whether the target air spring is in the lower limit position of the suspension stroke according to the actual height of the target air spring. If so and the difference between the historical height of the target air spring at the past moment and its current actual height is greater than the height difference threshold, it means that the air spring system can be exhausted normally, that is, the target air spring distribution valve, There are no faults in the pressure relief valve and the target air spring pressure-maintaining valve pipeline. In other words, even if it is subsequently detected that the target air spring has an under-pressure problem, it is not caused by abnormalities in the target air spring distribution valve, the pressure relief valve, and the target air spring pressure-maintaining valve pipeline. Then, the target air spring distribution valve is controlled to be in an open state and the pressure relief valve and the air pump are in a closed state, so that the pressure value detected by the pressure detector is the actual pressure value of the target air spring. This pressure value can be used to accurately diagnose whether the target air spring has an under-pressure problem, that is, when the air spring pressure value is less than the under-pressure threshold, it is determined that the target air spring is in an under-pressure state. Through this application, the influence of abnormal working conditions of the air spring distribution valve, the pressure relief valve, and the air spring pressure-maintaining valve on the diagnosis of air spring under-pressure can be effectively eliminated, so as to achieve accurate diagnosis of air spring under-pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a flow chart of an embodiment of the air spring undervoltage diagnosis method of the present application;

[0053] Figure 2 This is a functional module diagram of an embodiment of an air spring undervoltage diagnostic device of the present application;

[0054] Figure 3 This is a schematic diagram of the hardware structure of the air spring undervoltage diagnostic device involved in the embodiment of the present application. DETAILED DESCRIPTION

[0055] 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.

[0056] 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.

[0057] In a first aspect, an embodiment of the present application provides a method for diagnosing undervoltage of an empty spring.

[0058] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of an embodiment of the method for diagnosing undervoltage of an empty spring in this application. Figure 1 As shown, the air spring undervoltage diagnosis method includes:

[0059] Step S10: When the target empty spring is in the exhaust condition, when it is detected that the height reduction of the target empty spring is less than the preset reduction threshold, it is determined whether the target empty spring is in the lower limit position of the suspension travel based on the actual height of the target empty spring.

[0060] By way of example, it should be understood that the target empty spring refers to the empty spring that needs to be diagnosed for underpressure (i.e., the object to be diagnosed); the reduction threshold refers to the threshold used to determine whether the reduction in height of the empty spring is normal. The specific value setting can be determined by considering the impact of special road conditions and other working conditions on the diagnostic results or by experimental calibration. No limitation is made here. For example, the reduction threshold is set to 3mm; the exhaust condition refers to controlling the high-pressure gas in the air spring to be transmitted to the air spring distribution valve through the air spring pressure maintaining valve, so as to transmit the high-pressure gas to the pressure relief valve through the air spring distribution valve and discharge it into the atmosphere, thereby achieving the lowering of the vehicle body.

[0061] In this embodiment, the air spring system can be initialized first and a determination can be made as to whether the air spring system has any faults. If a fault exists, the ASC (Air Suspension Controller) controller will issue a system fault alarm. If no fault exists, when the target air spring is in the exhaust condition, a preliminary detection will be performed to determine whether the target air spring distribution valve, the pressure relief valve, and the target air spring pressure maintaining valve pipeline and other objects may have faults, so as to eliminate the influence of abnormal working of the air spring distribution valve, the pressure relief valve, and the air spring pressure maintaining valve on the air spring underpressure diagnosis. Specifically, the height reduction amount corresponding to the preset cumulative exhaust time T (for example, 5s, which can be determined according to actual needs) of the target air spring can be collected through a height sensor, so as to determine the height reduction amount based on the height reduction amount. The relationship between the height reduction of the target air spring and the reduction amount threshold is used to preliminarily determine whether objects such as the target air spring distribution valve, the pressure relief valve, and the target air spring pressure maintaining valve pipeline may have faults; among them, if the height reduction of the target air spring is less than the reduction amount threshold, it means that objects such as the target air spring distribution valve, the pressure relief valve, and the target air spring pressure maintaining valve pipeline may have faults, but there is no way to accurately determine it. At this time, it is necessary to detect whether the target air spring is at the lower limit position of the suspension stroke through the actual height of the target air spring, so as to further diagnose whether objects such as the target air spring distribution valve, the pressure relief valve, and the target air spring pressure maintaining valve pipeline are actually faulty.

[0062] Step S20: If the difference between the historical height of the target empty spring at the preset historical moment and the actual height is greater than the preset height difference threshold, the target empty spring distribution valve is controlled to be in an open state and the pressure relief valve and the air pump are in a closed state to obtain the empty spring pressure value.

[0063] Exemplarily, in this embodiment, whether the target empty spring is at the lower limit position of the suspension travel can be determined based on the difference between the actual height of the current target empty spring and the height threshold corresponding to the preset lower limit position of the suspension travel; if the difference is less than the preset difference calibration value (for example, 5mm), it means that the exhaust of the empty spring system should be normal. However, in order to improve the accuracy of the diagnosis, it is necessary to further perform the diagnosis based on the relationship between the difference between the historical height of the target empty spring at the preset historical moment and the actual height and the height difference threshold.

[0064] It should be understood that the preset historical moment refers to a moment in the past, for example, if the preset historical moment is 10s, then the historical height of the target empty spring at the preset historical moment refers to the height corresponding to the target empty spring in the past 10s; it should be noted that the specific value setting of the preset historical moment can be determined according to actual needs, and is not limited here. As long as the time corresponding to the preset historical moment is greater than the cumulative exhaust time, for example, if the cumulative exhaust time is 5s, the preset historical moment needs to be set to be greater than 5s, for example, set to 10s, then the height sensor will respectively collect the height reduction amount of the target empty spring in the past 5s and the historical height of the target empty spring in the past 10s (i.e. 10s ago); in addition, the specific value settings of the height threshold, difference calibration amount and height difference threshold can be determined according to the actual needs of different models or determined through experimental calibration, and are not limited here; for example, the height difference threshold is set to 10mm.

[0065] Among them, if the difference between the historical height of the target empty spring at the preset historical moment and the actual height is greater than the height difference threshold, then it can be accurately determined that the empty spring system is exhausted normally, that is, the target empty spring distribution valve, pressure relief valve, and target empty spring pressure maintaining valve pipelines related to the exhaust of the target empty spring are installed normally; then the target empty spring distribution valve is individually controlled to be in an open state and the pressure relief valve and the air pump are in a closed state, so that the pressure value detected by the pressure detector (i.e., the empty spring pressure value) is the actual pressure value of the target empty spring, and then the empty spring pressure value is used to accurately diagnose whether the target empty spring has an underpressure problem. It should be noted that the pressure sensor in the empty spring system is a common component, so whether it is the empty spring pressure detection or the air tank pressure detection, it is achieved through the pressure sensor after opening the corresponding distribution valve.

[0066] Step S30: When the empty spring pressure value is less than a preset under-pressure threshold, it is determined that the target empty spring is in an under-pressure state.

[0067] Wherein, after the step of controlling the target empty spring distribution valve to be in an open state and the pressure relief valve and the air pump to be in a closed state to obtain the empty spring pressure value, the method further includes:

[0068] If the empty spring pressure value is not less than the underpressure threshold, it is determined that the target empty spring is in a non-underpressure state.

[0069] Exemplarily, it should be noted that the underpressure threshold refers to the pressure value used to determine whether the air spring is underpressure. The specific value setting can be determined according to the actual needs of different models or determined by experimental calibration, and is not limited here. For example, the underpressure threshold is set to 3bar. In this embodiment, the relationship between the air spring pressure value and the underpressure threshold is used to diagnose whether the target air spring has an underpressure problem; specifically, if the air spring pressure value is less than the underpressure threshold, it proves that the target air spring is indeed underpressure, so the ASC controller in the air spring system will alarm the target air spring in an underpressure state; and if the air spring pressure value is not less than the underpressure threshold, it proves that the exhaust of the air spring system is indeed normal, that is, the target air spring does not have an underpressure problem, but the target air spring has reached the lower limit travel of the suspension and cannot be further reduced. Then the ASC controller will alarm the target air spring in a non-underpressure state, and alarm to prompt that the target air spring has reached the lower limit travel of the suspension. It can be seen that the present application can effectively eliminate the influence of abnormal working of the air spring distribution valve, the pressure relief valve and the air spring pressure maintaining valve on the air spring underpressure diagnosis, so as to achieve accurate diagnosis of air spring underpressure.

[0070] Further, in one embodiment, after the step of determining whether the target empty spring is at the lower limit position of the suspension travel based on the actual height of the target empty spring, the method further includes:

[0071] If the target empty spring is at the lower limit position of the suspension travel and the difference between the historical height and the actual height is not greater than the height difference, the target empty spring distribution valve and the air pump are controlled to be in an open state to determine whether the height of the target empty spring rises;

[0072] If not, it is determined that the target air spring distribution valve is faulty;

[0073] If so, the target air spring distribution valve, air pump and pressure relief valve are opened and closed to control the target object to determine the fault diagnosis result of the target object according to the control result, and the target object includes the pressure relief valve and the target air spring pressure maintaining valve pipeline.

[0074] Exemplarily, in this embodiment, if the target empty spring is at the lower limit position of the suspension stroke and the difference between the historical height of the target empty spring at the preset historical moment and the actual height is not greater than the height difference, it is proved that there is an abnormality in the exhaust of the target empty spring, that is, at least one of the target empty spring distribution valve, the pressure relief valve or the target empty spring pressure maintaining valve pipeline related to the exhaust of the target empty spring has an abnormality; then this embodiment will inflate the target empty spring by controlling the target empty spring distribution valve and the air pump to be in the open state. At this time, if the target empty spring distribution valve has no faults, then under normal circumstances the height of the target empty spring will rise; based on this, the height of the target empty spring can be judged The ASC controller can diagnose whether the target air spring distribution valve has a fault by checking whether the target air spring height has risen. That is, if the target air spring height has not risen, it proves that there is an abnormality in the target air spring distribution valve. Therefore, the ASC controller will alarm that there is a fault in the target air spring distribution valve. However, if the target air spring height has risen, it proves that the target air spring distribution valve can work normally, that is, there is no fault. In other words, there is a fault in one of the pressure relief valve and the target air spring pressure maintaining valve pipeline. Therefore, the target air spring distribution valve, air pump and pressure relief valve will continue to be opened and closed to determine the fault diagnosis results of the pressure relief valve and the target air spring pressure maintaining valve pipeline according to the pressure value collected by the pressure sensor.

[0075] Further, in one embodiment, the on-off control of the target air spring distribution valve, the air pump and the pressure relief valve is performed to determine the fault diagnosis result of the target object according to the control result, including:

[0076] After waiting for the pressure value in the target air spring to reach a preset pressure threshold, the target air spring distribution valve and the air pump are controlled to be in a closed state, and the pressure relief valve is controlled to be in an open state to obtain the pipeline pressure value;

[0077] If the difference between the pipeline pressure value and the pressure threshold is less than a preset pressure difference threshold, it is determined that the pressure relief valve is faulty;

[0078] If the difference between the pipeline pressure value and the pressure threshold is not less than a preset pressure difference threshold, it is determined that there is a fault in the target air-spring pressure-maintaining valve pipeline.

[0079] By way of example, it should be noted that the specific value settings of the pressure threshold and the pressure difference threshold can be determined according to the actual needs of different vehicle models or through experimental calibration, and are not limited here. For example, the pressure threshold is set to 5 bar and the pressure difference threshold is 0.3 bar. It should be understood that the pressure threshold is set slightly larger than the atmospheric pressure, so that after the pressure relief valve is opened, there is a large pressure difference between the pressure in the pipeline and the atmospheric pressure, which can effectively improve the diagnostic accuracy of the pressure relief valve failure.

[0080] In this embodiment, when it is determined that there is no fault in the target air spring distribution valve through the increase in the height of the target air spring, the pressure of the target air spring inflation process is collected based on the pressure sensor in the air spring system. After the pressure value collected by the pressure sensor reaches the pressure threshold of 5 bar, the target air spring distribution valve and the air pump are controlled to be in a closed state, and the pressure relief valve is in an open state; then observe whether the difference between the pipeline pressure value collected by the pressure sensor and the pressure threshold of 5 bar is less than the pressure difference threshold of 0.3 bar; if so, it proves that there is an abnormality in the pressure relief valve, so that it cannot be opened normally for exhaust, so the ASC controller will alarm the pressure relief valve failure; if not, it proves that the pressure relief valve can be opened normally for exhaust, then it can be determined that there is an abnormality in the installation of the target air spring pressure maintaining valve pipeline, so the ASC controller will alarm the target air spring pressure maintaining valve pipeline failure, and prompt that the target air spring cannot be lowered. It should be understood that if the air spring pressure-maintaining valve pipeline is not assembled, it will be a one-way valve, that is, it can only inflate the air spring; and if the air spring pressure-maintaining valve pipeline is assembled, it will be a two-way valve, that is, it can inflate and deflate the air spring.

[0081] Further, in one embodiment, after the step of determining whether the target empty spring is at the lower limit position of the suspension travel based on the actual height of the target empty spring, the method further includes:

[0082] If the target empty spring is not at the lower limit position of the suspension stroke, the target empty spring distribution valve and the air pump are controlled to be in an open state and the step of determining whether the height of the target empty spring rises is performed.

[0083] Exemplarily, in this embodiment, if the target air spring is not at the lower limit position of the suspension travel, it means that there is an abnormality in the exhaust path of the target air spring, that is, there is an abnormality in the installation of the target air spring distribution valve, pressure relief valve, and target air spring pressure maintaining valve pipelines related to the target air spring exhaust. Therefore, it is necessary to diagnose and locate the specific fault location of the target air spring distribution valve, pressure relief valve, and target air spring pressure maintaining valve pipeline installation.

[0084] Specifically, the target air spring distribution valve and the air pump are first controlled to be in an open state to inflate the target air spring. At this time, if the target air spring distribution valve has no faults, then under normal circumstances the height of the target air spring will rise; based on this, whether the target air spring distribution valve has a fault can be diagnosed by judging whether the height of the target air spring has risen, that is, if the height of the target air spring has not risen, it proves that there is an abnormality in the target air spring distribution valve, so the ASC controller will alarm that there is a fault in the target air spring distribution valve; but if the height of the target air spring has risen, it proves that the target air spring distribution valve can work normally, that is, there is no fault. In other words, one of the pressure relief valve and the target air spring pressure maintaining valve pipeline has a fault; therefore, the target air spring distribution valve, the air pump and the pressure relief valve will continue to be controlled to open and close, so as to determine the fault diagnosis results of the pressure relief valve and the target air spring pressure maintaining valve pipeline according to the pressure value collected by the pressure sensor.

[0085] When it is determined that there is no fault in the target air spring distribution valve through the increase in the height of the target air spring, the pressure of the target air spring inflation process is collected based on the pressure sensor in the air spring system. After the pressure value collected by the pressure sensor reaches the pressure threshold of 5 bar, the target air spring distribution valve and the air pump are controlled to be in a closed state, and the pressure relief valve is in an open state; then observe whether the difference between the pipeline pressure value collected by the pressure sensor and the pressure threshold of 5 bar is less than the pressure difference threshold of 0.3 bar; if so, it proves that there is an abnormality in the pressure relief valve, so that it cannot be opened normally for exhaust, so the ASC controller will alarm the pressure relief valve failure; if not, it proves that the pressure relief valve can be opened normally for exhaust, then it can be determined that there is an abnormality in the installation of the target air spring pressure maintaining valve pipeline, so the ASC controller will alarm the target air spring pressure maintaining valve pipeline failure, and prompt that the target air spring cannot be lowered.

[0086] Further, in one embodiment, when it is detected that the height reduction amount of the target empty spring is not less than the reduction amount threshold, the current pressure value of the target empty spring is obtained;

[0087] Determine whether the current pressure value is less than the undervoltage threshold,

[0088] If so, it is determined that the target empty spring is in an under-pressure state;

[0089] If not, it is determined that the target empty spring is in a non-underpressure state.

[0090] Exemplarily, in this embodiment, when the target empty spring is in the exhaust condition, when the height reduction amount corresponding to the target empty spring collected by the height sensor within the cumulative exhaust time T is not less than the reduction amount threshold, it can be proved that the target empty spring distribution valve, the pressure relief valve and the target empty spring pressure maintaining valve pipeline are all normal and there is no fault, then the target empty spring can continue to be diagnosed whether there is an underpressure problem. Specifically, the current pressure value of the target empty spring can be obtained first, and the target empty spring can be diagnosed whether it is underpressure by the relationship between the current pressure value of the target empty spring and the underpressure threshold; wherein, if the current pressure value is less than the underpressure threshold, it proves that the target empty spring is indeed underpressure, so the ASC controller will alarm the target empty spring in an underpressure state; and if the current pressure value is not less than the underpressure threshold, it proves that the empty spring system can work normally, that is, the target empty spring does not have an underpressure problem, then the ASC controller will alarm the target empty spring in a non-underpressure state.

[0091] Furthermore, in one embodiment, after the step of determining whether the target empty spring is in an under-pressure state, the method further includes:

[0092] Controlling the air pump and the target empty spring distribution valve to be in an open state to replenish air to the target empty spring;

[0093] When the pressure in the target empty spring reaches a preset underpressure recovery threshold, the air replenishment operation is controlled to be in a stopped state so that the target empty spring is in a non-underpressure state.

[0094] For example, it should be noted that the under-pressure recovery threshold refers to the value used to determine whether the target air spring pressure has returned to normal. The specific value setting can be determined according to the actual needs of different models or determined through experimental calibration. It is not limited here. For example, the under-pressure recovery threshold is set to 5bar. In this embodiment, when the ASC controller alarms that the target air spring is under-pressure, the air pump and the target air spring distribution valve will be opened to replenish air for the target air spring; when the pressure in the target air spring is greater than the under-pressure recovery threshold of 5bar, it means that the target air spring pressure has returned to normal, and the target air spring can be stopped from being inflated. At this time, the target air spring no longer has an under-pressure problem.

[0095] It is understandable that, when implementing the air spring underpressure diagnosis, traditionally, only the height value of the height sensor is detected, which cannot rule out the possibility of distribution valve and pressure relief valve failure, resulting in possible misdiagnosis, so there is a problem of low diagnostic accuracy; in addition, it can only detect that the height change of the height sensor is small, and cannot accurately locate whether it is an abnormal failure of the distribution valve, pressure relief valve or pressure maintaining valve assembly, and cannot accurately locate whether it is really an air spring underpressure, so there is also a problem of small diagnostic coverage.

[0096] The present embodiment can not only realize the accurate diagnosis of air spring underpressure to avoid false alarm of air spring underpressure, and can timely replenish air when the air spring is underpressure to control its pressure within a normal range, but also improve the diagnosis coverage, that is, it can simultaneously perform fault diagnosis of related distribution valves, pressure relief valves, pressure maintaining valve pipeline installation, etc., so that workers can quickly locate the cause of the problem and eliminate it in a targeted manner; in addition, the control logic of the air spring underpressure diagnosis involved in the present embodiment can be encapsulated in the ASC controller to intelligently detect whether there is an underpressure problem in the air spring through ASC, so as to avoid manual inspection that consumes a lot of man-hours of disassembly, and can quickly locate the cause of the problem, thereby avoiding the problem of repeated disassembly and failure to locate the cause of the fault, thereby saving a lot of after-sales man-hours.

[0097] In a second aspect, an embodiment of the present application also provides an empty spring undervoltage diagnostic device.

[0098] In one embodiment, referring to Figure 2 , Figure 2 This is a functional module diagram of an embodiment of the air spring undervoltage diagnostic device of the present application. Figure 2 As shown, the air spring undervoltage diagnostic device includes:

[0099] a detection module, which is used to determine whether the target empty spring is at the lower limit position of the suspension travel based on the actual height of the target empty spring when it is detected that the height reduction amount of the target empty spring is less than a preset reduction amount threshold when the target empty spring is in the exhaust condition;

[0100] A control module, which is used to control the target empty spring distribution valve to be in an open state and the pressure relief valve and the air pump to be in a closed state, if the difference between the historical height of the target empty spring at a preset historical moment and the actual height is greater than a preset height difference threshold, so as to obtain the empty spring pressure value;

[0101] The diagnostic module is used to determine that the target empty spring is in an under-pressure state when the empty spring pressure value is less than a preset under-pressure threshold.

[0102] Furthermore, in one embodiment, the control module is also used to control the target air spring distribution valve and the air pump to be in an open state if the target air spring is in the lower limit position of the suspension stroke and the difference between the historical height and the actual height is not greater than the height difference, so as to determine whether the height of the target air spring has risen; the diagnostic module is also used to determine if no, whether there is a fault in the target air spring distribution valve; if so, to control the opening and closing of the target air spring distribution valve, the air pump and the pressure relief valve, so as to determine the fault diagnosis result of the target object according to the control result, and the target object includes the pressure relief valve and the target air spring pressure maintaining valve pipeline.

[0103] Furthermore, in one embodiment, the diagnosis module is specifically used for:

[0104] Waiting for the pressure value in the target air spring to reach a preset pressure threshold, controlling the target air spring distribution valve and the air pump to be in a closed state, and controlling the pressure relief valve to be in an open state, so as to obtain the pipeline pressure value;

[0105] If the difference between the pipeline pressure value and the pressure threshold is less than a preset pressure difference threshold, it is determined that the pressure relief valve is faulty;

[0106] If the difference between the pipeline pressure value and the pressure threshold is not less than a preset pressure difference threshold, it is determined that there is a fault in the target air-spring pressure-maintaining valve pipeline.

[0107] Furthermore, in one embodiment, the control module is also used to: if the target empty spring is not at the lower limit position of the suspension travel, control the target empty spring distribution valve and the air pump to be in an open state and execute the step of determining whether the height of the target empty spring has risen.

[0108] Furthermore, in one embodiment, the diagnostic module is also used to: determine that the target empty spring is in a non-underpressure state if the empty spring pressure value is not less than the underpressure threshold.

[0109] Furthermore, in one embodiment, the diagnosis module is also used for:

[0110] When it is detected that the height reduction amount of the target empty spring is not less than the reduction amount threshold, obtaining the current pressure value of the target empty spring;

[0111] Determine whether the current pressure value is less than the undervoltage threshold,

[0112] If so, it is determined that the target empty spring is in an under-pressure state;

[0113] If not, it is determined that the target empty spring is in a non-underpressure state.

[0114] Furthermore, in one embodiment, the empty spring undervoltage diagnostic device further includes a recovery module, which is used to:

[0115] Controlling the air pump and the target empty spring distribution valve to be in an open state to replenish air to the target empty spring;

[0116] When the pressure in the target empty spring reaches a preset underpressure recovery threshold, the air replenishment operation is controlled to be in a stopped state so that the target empty spring is in a non-underpressure state.

[0117] Among them, the functional implementation of each module in the above-mentioned empty spring undervoltage diagnostic device corresponds to the various steps in the above-mentioned empty spring undervoltage diagnostic method embodiment, and its functions and implementation processes will not be repeated here one by one.

[0118] In a third aspect, an embodiment of the present application provides an air spring undervoltage diagnostic device, which may be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0119] Reference Figure 3 , Figure 3 Schematic diagram of the hardware structure of the empty spring undervoltage diagnosis device involved in the embodiment of the present application. In the embodiment of the present application, the empty spring undervoltage diagnosis device may include a processor, a memory, a communication interface and a communication bus.

[0120] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0121] The communication interface includes input / output (I / O) interface, physical interface and logical interface, etc., which are used to realize the interconnection of devices inside the air spring undervoltage diagnosis device, and the interface used to realize the interconnection of the air spring undervoltage diagnosis device with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, a fiber optic interface, an ATM interface, etc.; the user device can be a display (Display), a keyboard (Keyboard), etc.

[0122] 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.

[0123] The processor may be a general-purpose processor, which may call the empty spring undervoltage diagnosis program stored in the memory and execute the empty spring undervoltage 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 empty spring undervoltage diagnosis program is called may refer to the various embodiments of the empty spring undervoltage diagnosis method of the present application, which will not be described in detail here.

[0124] Those skilled in the art will understand that Figure 3 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.

[0125] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0126] An empty spring undervoltage diagnostic program is stored on a readable storage medium of the present application, wherein when the empty spring undervoltage diagnostic program is executed by a processor, the steps of the empty spring undervoltage diagnostic method as described above are implemented.

[0127] Among them, the method implemented when the empty spring underpressure diagnostic program is executed can refer to the various embodiments of the empty spring underpressure diagnostic method of the present application, and will not be repeated here.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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 undervoltage of an empty spring, characterized in that: The air spring undervoltage diagnosis method comprises: When the target empty spring is in the exhaust condition, when it is detected that the height reduction amount of the target empty spring is less than a preset reduction amount threshold, it is determined whether the target empty spring is in the lower limit position of the suspension travel based on the actual height of the target empty spring; If the difference between the historical height of the target empty spring at the preset historical moment and the actual height is greater than the preset height difference threshold, the target empty spring distribution valve is controlled to be in an open state and the pressure relief valve and the air pump are controlled to be in a closed state to obtain the empty spring pressure value; When the empty spring pressure value is less than a preset underpressure threshold, it is determined that the target empty spring is in an underpressure state.

2. The method for diagnosing undervoltage of an empty spring as claimed in claim 1, characterized in that: After the step of determining whether the target empty spring is at the lower limit position of the suspension travel based on the actual height of the target empty spring, the method further includes: If the target empty spring is at the lower limit position of the suspension travel and the difference between the historical height and the actual height is not greater than the height difference, the target empty spring distribution valve and the air pump are controlled to be in an open state to determine whether the height of the target empty spring rises; If not, it is determined that the target air spring distribution valve is faulty; If so, the target air spring distribution valve, air pump and pressure relief valve are opened and closed to control the target object to determine the fault diagnosis result of the target object according to the control result, and the target object includes the pressure relief valve and the target air spring pressure maintaining valve pipeline.

3. The method for diagnosing undervoltage of an empty spring as claimed in claim 2, characterized in that: The target air spring distribution valve, air pump and pressure relief valve are controlled to be opened and closed to determine the fault diagnosis result of the target object according to the control result, including: Waiting for the pressure value in the target air spring to reach a preset pressure threshold, controlling the target air spring distribution valve and the air pump to be in a closed state, and controlling the pressure relief valve to be in an open state, so as to obtain the pipeline pressure value; If the difference between the pipeline pressure value and the pressure threshold is less than a preset pressure difference threshold, it is determined that the pressure relief valve is faulty; If the difference between the pipeline pressure value and the pressure threshold is not less than a preset pressure difference threshold, it is determined that there is a fault in the target air-spring pressure-maintaining valve pipeline.

4. The method for diagnosing undervoltage of an empty spring as claimed in claim 2, characterized in that: After the step of determining whether the target empty spring is at the lower limit position of the suspension travel based on the actual height of the target empty spring, the method further includes: If the target empty spring is not at the lower limit position of the suspension stroke, the target empty spring distribution valve and the air pump are controlled to be in an open state and the step of determining whether the height of the target empty spring rises is performed.

5. The method for diagnosing undervoltage of an empty spring as claimed in claim 1, characterized in that: After the step of controlling the target empty spring distribution valve to be in an open state and the pressure relief valve and the air pump to be in a closed state to obtain the empty spring pressure value, the method further includes: If the empty spring pressure value is not less than the underpressure threshold, it is determined that the target empty spring is in a non-underpressure state.

6. The method for diagnosing undervoltage of an empty spring as claimed in claim 1, characterized in that: The method further comprises: When it is detected that the height reduction amount of the target empty spring is not less than the reduction amount threshold, obtaining the current pressure value of the target empty spring; Determine whether the current pressure value is less than the undervoltage threshold, If so, it is determined that the target empty spring is in an under-pressure state; If not, it is determined that the target empty spring is in a non-underpressure state.

7. The method for diagnosing undervoltage of an empty spring according to claim 1 or 6, characterized in that: After the step of determining that the target empty spring is in an under-pressure state, the method further includes: Controlling the air pump and the target empty spring distribution valve to be in an open state to replenish air to the target empty spring; When the pressure in the target empty spring reaches a preset underpressure recovery threshold, the air replenishment operation is controlled to be in a stopped state so that the target empty spring is in a non-underpressure state.

8. An empty spring undervoltage diagnostic device, characterized in that: The empty spring undervoltage diagnostic device comprises: a detection module, which is used to determine whether the target empty spring is at the lower limit position of the suspension travel based on the actual height of the target empty spring when it is detected that the height reduction amount of the target empty spring is less than a preset reduction amount threshold when the target empty spring is in the exhaust condition; A control module, which is used to control the target empty spring distribution valve to be in an open state and the pressure relief valve and the air pump to be in a closed state, if the difference between the historical height of the target empty spring at a preset historical moment and the actual height is greater than a preset height difference threshold, so as to obtain the empty spring pressure value; The diagnostic module is used to determine that the target empty spring is in an under-pressure state when the empty spring pressure value is less than a preset under-pressure threshold.

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

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores an empty spring underpressure diagnostic program, wherein when the empty spring underpressure diagnostic program is executed by the processor, the steps of the empty spring underpressure diagnostic method as described in any one of claims 1 to 7 are implemented.

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