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

Abstract

A method, device, equipment and computer-readable storage medium for diagnosing under-pressure of an air spring relate to the field of vehicle diagnostic technology, including: when the target air spring is in an exhaust condition, when it is detected that the height reduction of the target air spring is less than a preset reduction threshold, then based on the actual height of the target air spring, determining whether the target air spring is in the lower limit position of the suspension stroke; if the difference between the historical height of the target air spring at a preset historical moment and the actual height is greater than the preset height difference threshold, then controlling the target air 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 air spring pressure value; when the air spring pressure value is less than the preset under-pressure threshold, determining that the target air spring is in an under-pressure state. Through this application, 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 under-pressure diagnosis can be effectively eliminated, so as to achieve accurate diagnosis of air spring under-pressure.

Description

Technical Field

[0001] The present application relates to the field of vehicle diagnosis technology, and in particular to a method, device, equipment and computer-readable storage medium for diagnosing undervoltage of an air spring. 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 within the normal pressure range; among them, if the air spring pressure is too low, it may cause the air spring to fall out, and then damage the air spring hardware structure. Therefore, it is very necessary to diagnose air spring underpressure.

[0003] In the prior art, when diagnosing under-pressure in an empty spring, an alarm is triggered if the height drop during the lowering process is detected to be less than a preset drop threshold. However, this solution simply detects the height and fails to consider the impact of abnormal operation of the distribution valve, pressure relief valve, and air spring pressure-maintaining valve on the air spring pressure, leading to the possibility of misdiagnosis. Therefore, accurately diagnosing under-pressure in an empty spring is an urgent problem that needs to be solved. Summary of the Invention

[0004] The present application provides a method, device, equipment and computer-readable storage medium for diagnosing under-voltage of an empty spring, which can solve the technical problem of being unable to accurately diagnose under-voltage of an empty spring in the prior art.

[0005] In a first aspect, an embodiment of the present application provides a method for diagnosing under-voltage of an empty spring, the method comprising:

[0006] When the target empty spring is in the exhaust condition, if it is detected that the height reduction of the target empty spring is less than a preset reduction threshold, 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;

[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 a 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 under-pressure threshold, it is determined that the target empty spring is in an under-pressure 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, controlling the target empty spring distribution valve and the air pump to be in an open state to determine whether the height of the target empty spring increases;

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

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

[0014] Waiting for the target air spring internal pressure value 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 pipeline of the target air-spring pressure-maintaining valve.

[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 method further includes:

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

[0021] In combination with the first aspect, in one embodiment, 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 embodiment, after the step of determining that the target empty spring is in an under-pressure state, the method 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 configured to determine, when the target empty spring is in an exhausting condition and the target empty spring is in an exhausting condition, whether the target empty spring is in a lower limit position of the suspension travel based on an actual height of the target empty spring when detecting that the height reduction of the target empty spring is less than a preset reduction threshold;

[0031] a control module configured 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 an 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 that 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 embodiment, the diagnostic module is specifically configured to:

[0035] Waiting for the target air spring internal pressure value 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 pipeline of the target air-spring pressure-maintaining valve.

[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 stroke, 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 increased.

[0039] In combination with the second aspect, in one embodiment, the diagnostic module is further configured 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.

[0040] In conjunction with the second aspect, in one embodiment, the diagnostic module is further configured to:

[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 conjunction with the second aspect, in one embodiment, the empty spring undervoltage diagnostic device further includes a recovery module, which is configured 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 air spring undervoltage diagnostic device, which includes a processor, a memory, and an air spring undervoltage diagnostic program stored in the memory and executable by the processor, wherein when the air spring undervoltage diagnostic program is executed by the processor, the steps of the air spring undervoltage 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 an empty spring undervoltage diagnostic program is stored, wherein when the empty spring undervoltage diagnostic program is executed by a processor, the steps of the aforementioned empty spring undervoltage diagnostic method are implemented.

[0050] The beneficial effects of the technical solutions 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 height reduction amount is used to detect whether there is any fault in the target air spring distribution valve, pressure relief valve and target air spring pressure maintaining valve pipeline. That is, if the height reduction amount is less than the reduction amount threshold, it indicates that the above objects may have a fault; then continue to determine whether the target air spring is at 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 indicates that the air spring system can be exhausted normally, that is, the target air spring distribution valve, There is no fault 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 underpressure 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. The pressure value can be used to accurately diagnose whether the target air spring has an underpressure problem, that is, when the air spring pressure value is less than the underpressure threshold, it is determined that the target air spring is in an underpressure 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 air spring underpressure diagnosis can be effectively eliminated, so as to achieve accurate diagnosis of air spring underpressure. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0053] Figure 2 This is a functional module diagram of an embodiment of the 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 present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this 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 at the lower limit position of the suspension stroke based on the actual height of the target empty spring.

[0060] For 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. It is not limited here. For example, the reduction threshold is set to 3mm; the exhaust working 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 it can be determined whether there is any fault in the air spring system. If there is a fault, the ASC (Air Suspension Controller) controller will issue a system fault alarm; if there is no fault, when the target air spring is in the exhaust condition, it will first preliminarily detect 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 the 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) can be collected by the height sensor 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 threshold is used to preliminarily determine whether there may be faults in objects such as the target air spring distribution valve, the pressure relief valve, and the target air spring pressure maintaining valve pipeline; among them, if the height reduction of the target air spring is less than the reduction threshold, it means that there may be faults in objects such as the target air spring distribution valve, the pressure relief valve, and the target air spring pressure maintaining valve pipeline, 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 there is actually a fault in objects such as the target air spring distribution valve, the pressure relief valve, and the target air spring pressure maintaining valve pipeline.

[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 the open state and the pressure relief valve and the air pump are in the 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 stroke 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 stroke; wherein, 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 diagnose based on the size 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 certain moment in the past. For example, if the preset historical moment is 10s, 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, if it is set to 10s, 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 air 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 air spring system exhaust is normal, that is, the target air spring distribution valve, pressure relief valve, and target air spring pressure maintaining valve pipelines related to the target air spring exhaust are all installed normally; then the target air spring distribution valve is individually controlled to be in the open state and the pressure relief valve and air pump are in the closed state, so that the pressure value detected by the pressure detector (i.e., the air spring pressure value) is the actual pressure value of the target air spring, and then the air spring pressure value is used to accurately diagnose whether the target air spring has an underpressure problem. It should be noted that the pressure sensor in the air spring system is a shared component. Therefore, whether it is air spring pressure detection or 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 under-pressure threshold, it is determined that the target empty spring is in a non-under-pressure state.

[0069] For example, it should be noted that the underpressure threshold refers to the pressure value used to determine whether the spring is underpressured. The specific value can be determined based on the actual needs of different vehicle models or through experimental calibration, and is not limited here. For example, the underpressure threshold is set to 3 bar. In this embodiment, the relationship between the spring pressure and the underpressure threshold is used to diagnose whether the target spring is underpressured. Specifically, if the spring pressure is less than the underpressure threshold, it indicates that the target spring is indeed underpressured, and the ASC controller in the spring system will warn that the target spring is underpressured. If the spring pressure is not less than the underpressure threshold, it indicates that the airflow of the spring system is normal, meaning that the target spring is not underpressured, but has simply reached the lower limit of suspension travel and cannot be lowered further. The ASC controller will then warn that the target spring is not underpressured and will warn that the target spring has reached the lower limit of suspension travel. This demonstrates that the present invention effectively eliminates the impact of malfunctions of the spring distribution valve, pressure relief valve, and spring pressure-maintaining valve on spring underpressure diagnosis, thereby accurately diagnosing spring underpressure.

[0070] Furthermore, 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, controlling the target empty spring distribution valve and the air pump to be in an open state to determine whether the height of the target empty spring increases;

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

[0073] If so, the target air spring distribution valve, air pump and pressure relief valve are opened and closed and controlled 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 air spring is at the lower limit position of the suspension stroke and the difference between the historical height of the target air spring at the preset historical moment and the actual height is not greater than the height difference, it proves that there is an abnormality in the exhaust of the target air spring, that is, there is an abnormality in at least one of the target air spring distribution valve, pressure relief valve or target air spring pressure maintaining valve pipeline related to the exhaust of the target air spring; then this embodiment will inflate the target air spring by controlling the target air spring distribution valve and the air pump to be in the open state. 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, the height of the target air spring can be judged by The ASC controller can diagnose whether there is a fault in the target air spring distribution valve by judging 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, so the ASC controller will alarm that there is a fault in the target air spring distribution valve; but 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] Furthermore, in one embodiment, the on-off control of the target air spring distribution valve, the air pump, and the pressure relief valve to determine the fault diagnosis result of the target object according to the control result includes:

[0076] After the target air spring internal pressure value reaches 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 pipeline of the target air-spring pressure-maintaining valve.

[0079] For 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 set to 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 it is observed 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 to 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 to 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; if the air spring pressure-maintaining valve pipeline is assembled, it will be a two-way valve, which can inflate and deflate the air spring.

[0081] Furthermore, 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] For example, in this embodiment, if the target air spring is not at the lower limit position of the suspension stroke, 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 the open state to inflate the target air spring. At this time, if the target air spring distribution valve has no fault, 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, 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.

[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 will be 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 the closed state, and the pressure relief valve is in the 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 to 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 to 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] Furthermore, 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] For example, in this embodiment, when the target spring is in the exhaust state, if the height reduction of the target spring within the cumulative exhaust time T, as measured by the height sensor, is not less than a reduction threshold, it can be confirmed that the target spring distribution valve, pressure relief valve, and target spring pressure-maintaining valve pipeline are all normal and not faulty. At this point, the diagnosis of whether the target spring is under-pressurized can be continued. Specifically, the current pressure value of the target spring can be first obtained, and the relationship between the current pressure value of the target spring and the under-pressure threshold can be used to diagnose whether the target spring is under-pressurized. If the current pressure value is less than the under-pressure threshold, it indicates that the target spring is indeed under-pressurized, and the ASC controller will warn that the target spring is under-pressurized. If the current pressure value is not less than the under-pressure threshold, it indicates that the spring system is functioning normally, i.e., the target spring is not under-pressurized, and the ASC controller will warn that the target spring is not under-pressurized.

[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 purposes of illustration, it should be noted that the underpressure recovery threshold is used to determine whether the target spring pressure has returned to normal. The specific value can be determined based on the actual needs of different vehicle models or through experimental calibration, and is not limited here. For example, the underpressure recovery threshold is set to 5 bar. In this embodiment, when the ASC controller issues an alarm indicating underpressure in the target spring, it opens the air pump and the target spring distribution valve to replenish air to the target spring. When the pressure within the target spring exceeds the underpressure recovery threshold of 5 bar, indicating that the target spring pressure has returned to normal, inflation of the target spring ceases, and the target spring is no longer underpressured.

[0095] It is understandable that, when implementing the diagnosis of air spring underpressure, traditionally, only the height value of the height sensor is detected, which cannot rule out the possibility of failure of the distribution valve or the pressure relief valve, resulting in possible misdiagnosis, and therefore there is a problem of low diagnostic accuracy; in addition, it can only detect that the height change of the height sensor is relatively small, and cannot accurately locate whether it is an abnormal failure of the distribution valve, the pressure relief valve or the 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 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 without being able 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 this application. Figure 2 As shown, the air spring undervoltage diagnostic device includes:

[0099] a detection module configured to determine, when the target empty spring is in an exhausting condition and the target empty spring is in an exhausting condition, whether the target empty spring is in a lower limit position of the suspension travel based on an actual height of the target empty spring when detecting that the height reduction of the target empty spring is less than a preset reduction threshold;

[0100] a control module configured 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 an 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 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 increased; the diagnostic module is also used to determine that 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, the air pump and the 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.

[0103] Furthermore, in one embodiment, the diagnostic module is specifically configured to:

[0104] Waiting for the target air spring internal pressure value 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 pipeline of the target air-spring pressure-maintaining valve.

[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 stroke, 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 increased.

[0108] Furthermore, in one embodiment, the diagnostic module is further configured 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 diagnostic module is further configured to:

[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 configured 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, memory, and communication interface.

[0121] Communication interfaces include input / output (I / O), physical, and logical interfaces, which interconnect components within the air-spring undervoltage diagnostic device and connect the device to other devices (such as other computing devices or user devices). Physical interfaces can include Ethernet, fiber, or ATM interfaces; user devices can include displays and keyboards.

[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 can be a general-purpose processor that can call an empty spring undervoltage diagnostic program stored in a memory and execute the empty spring undervoltage diagnostic method provided in the embodiments of the present application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the empty spring undervoltage diagnostic program is called can be referred to in the various embodiments of the empty spring undervoltage diagnostic method of the present application and will not be further described here.

[0124] Those skilled in the art will understand that Figure 3 The hardware structure shown in the figure does not constitute a limitation to the present application and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

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

[0126] The readable storage medium of the present application stores an empty spring undervoltage diagnostic program, wherein when the empty spring undervoltage diagnostic program is executed by the 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 undervoltage diagnosis program is executed can refer to the various embodiments of the empty spring undervoltage diagnosis method of this 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 for description only 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 the "first", "second" and "third" to different types.

[0130] In the description of the embodiments of this application, the words "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 this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[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; “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 are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed 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 the necessary general hardware platform, of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, 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, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling 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 do not 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 includes: When the target empty spring is in the exhaust condition, if it is detected that the height reduction of the target empty spring is less than a preset reduction threshold, 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; If the difference between the historical height of the target empty spring at the preset historical moment and the actual height is greater than a 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 under-pressure threshold, it is determined that the target empty spring is in an under-pressure state.

2. The method for diagnosing undervoltage of an empty spring according to claim 1, wherein: After the step of determining whether the target empty spring is at the lower limit position of the suspension stroke 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 threshold, controlling the target empty spring distribution valve and the air pump to be in an open state to determine whether the target empty spring height increases; If the target empty spring height does not rise, it is determined that the target empty spring distribution valve has a fault; If the height of the target empty spring rises, the target empty spring distribution valve, air pump and pressure relief valve are opened and closed to determine the fault diagnosis result of the target object based on the control result. The target object includes the pressure relief valve and the target empty spring pressure maintaining valve pipeline.

3. The method for diagnosing undervoltage of an empty spring according to claim 2, wherein: 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 target air spring internal pressure value 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 pipeline of the target air-spring pressure-maintaining valve.

4. The method for diagnosing undervoltage of an empty spring according to claim 2, wherein: After the step of determining whether the target empty spring is at the lower limit position of the suspension stroke 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 according to claim 1, 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: If the empty spring pressure value is not less than the under-pressure threshold, it is determined that the target empty spring is in a non-under-pressure state.

6. The method for diagnosing undervoltage of an empty spring according to claim 1, wherein: 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 the current pressure value is less than the under-pressure threshold, it is determined that the target empty spring is in an under-pressure state; If the current pressure value is not less than the under-pressure threshold, it is determined that the target empty spring is in a non-under-pressure 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 air spring undervoltage diagnostic device comprises: a detection module configured to determine, when the target empty spring is in an exhausting condition and the target empty spring is in an exhausting condition, whether the target empty spring is in a lower limit position of the suspension travel based on an actual height of the target empty spring when detecting that the height reduction of the target empty spring is less than a preset reduction threshold; a control module configured 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 an 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 air 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 undervoltage diagnostic program, wherein when the empty spring undervoltage diagnostic program is executed by the processor, the steps of the empty spring undervoltage diagnostic method according to any one of claims 1 to 7 are implemented.

Images