Air quantity control method, device and equipment of air suspension system

Abstract

The invention relates to an air flow control method, device and equipment of an air suspension system. The method comprises the following steps: detecting gas data of a preset air suspension system; according to the gas data of the air suspension system, the lifting performance state of the air suspension system is determined; and under the condition that the lifting performance state of the air suspension system is abnormal, air flow control is executed on the air suspension system according to the lifting performance state of the air suspension system. According to the embodiment of the invention, the air quantity in the air suspension system can be intelligently controlled, and especially in the vehicle driving process, when the lifting performance state is abnormal, the air quantity control can be dynamically executed, so that the air quantity in the air suspension system is normal, and the defect that the air quantity is not normal in the vehicle driving process is overcome. The problem that an air quantity control scheme for the air suspension system is lacked is solved, and the driving safety and comfort are improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an air volume control method, device and equipment for an air suspension system. Background Art

[0002] With the continuous development of my country's automobile industry, air suspension systems are increasingly being used in different vehicles. Vehicles equipped with air suspension systems can actively raise and lower the vehicle suspension according to driver needs and road conditions, which greatly improves the vehicle's passability and comfort. Compared with traditional coil spring mechanical suspensions, air suspension systems are more sophisticated and have rubber structures such as bladders and pipes. Because the air suspension system has a rubber structure, the air suspension system has poor resistance to external force impacts, bad roads, and other situations, and parts are easily damaged, resulting in air leakage. When the air suspension system leaks, the height of the leaking end will collapse, which is a hidden danger to vehicle safety and driving safety. Moreover, the rubber structure of the air suspension system needs to be inflated. If the amount of air in the rubber structure is too large, the overall air pressure of the air suspension system will be too high, the height of the vehicle body will be abnormal, etc., which will affect the stability and comfort of the vehicle, and the user experience will be poor.

[0003] At present, there is no solution to control the air volume of the air suspension system during driving. In case of air leakage in the air suspension system, the user can only stop driving immediately and hand the vehicle over to a technician for inspection after seeing the air leakage warning of the air suspension system. In case of excessive air volume in the air suspension system, the vehicle will not issue an alarm under normal circumstances, and the vehicle can only be inspected when the user sends the vehicle for repair. Summary of the invention

[0004] The present application provides an air volume control method, device and equipment for an air suspension system to solve the problem of lack of a solution for air volume control of an air suspension system during driving a vehicle.

[0005] In view of the above technical problems, the technical solution of this application is solved by the following embodiments:

[0006] An embodiment of the present application provides a method for controlling the air volume of an air suspension system, comprising: detecting gas data of a preset air suspension system; determining a lifting performance state of the air suspension system according to the gas data of the air suspension system; and performing air volume control on the air suspension system according to the lifting performance state of the air suspension system when an abnormality occurs in the lifting performance state of the air suspension system.

[0007] Wherein, the detecting of the gas data of the air suspension system includes: when a preset time node arrives, detecting the system gas volume of the air suspension system and the air tank pressure of the air suspension system; wherein, the time node includes: a preset first moment before the vehicle body height is adjusted, a preset second moment after the vehicle body height is adjusted, and / or a preset third moment after the vehicle is switched to the parking gear.

[0008] Wherein, determining the lifting and lowering performance state of the air suspension system according to the gas data of the air suspension system includes: when the system gas volume is greater than a preset first gas volume threshold, determining that the lifting and lowering performance state of the air suspension system is a slow lowering state; when the system gas volume is less than or equal to the first gas volume threshold and the system gas volume is greater than a preset second gas volume threshold, determining that the lifting and lowering performance state of the air suspension system is a normal lifting and lowering state; when the system gas volume is less than or equal to the second gas volume threshold and the gas tank pressure is greater than or equal to a preset pressure threshold, determining that the lifting and lowering performance state of the air suspension system is a slow rising state; when the system gas volume is less than or equal to the second gas volume threshold and the gas tank pressure is less than the pressure threshold, determining that the lifting and lowering performance state of the air suspension system is a lifting and lowering failure state; wherein the slow lowering state, the slow rising state and the lifting and lowering failure state are abnormal lifting performance states.

[0009] Among them, the air volume control of the air suspension system is performed according to the lifting performance state of the air suspension system, including: when the lifting performance state of the air suspension system is a slow lowering state, opening the exhaust valve of the air suspension system; when it is detected that the system air volume is less than or equal to the first air volume threshold and the system air volume is greater than the second air volume threshold, closing the exhaust valve of the air suspension system.

[0010] Among them, the air volume control of the air suspension system is performed according to the lifting performance state of the air suspension system, including: when the lifting performance state of the air suspension system is a slow rising state or a lifting failure state, obtaining the current vehicle body gear height; for each drive shaft of the vehicle, detecting the actual vehicle body height corresponding to the drive shaft; and performing an air replenishment operation on the air suspension system according to the vehicle body gear height and the actual vehicle body height corresponding to the drive shaft.

[0011] Among them, the air replenishing operation is performed on the air suspension system according to the vehicle body gear height and the actual vehicle body height corresponding to the drive shaft, including: for each drive shaft of the vehicle, determining the deviation value between the actual vehicle body height corresponding to the drive shaft and the vehicle body gear height; when the deviation value is greater than the difference threshold corresponding to the current vehicle state, performing an inflation operation on the gas spring corresponding to the drive shaft until the deviation value between the actual vehicle body height corresponding to the drive shaft and the vehicle body gear height is less than or equal to the difference threshold.

[0012] The method comprises: performing an air replenishment operation on the air suspension system according to the vehicle gear height and the real vehicle height corresponding to the drive shaft, comprising: determining the height reduction speed of the drive shaft according to the change of the real vehicle height corresponding to the drive shaft for each drive shaft of the vehicle; performing an air replenishment operation on the air tank of the air suspension system and accumulating the number of air replenishment operations when the height reduction speed is greater than zero and less than a preset first speed threshold and the current vehicle state is a stationary state; performing a preset first fault warning operation when the number of air replenishment operations reaches a preset number within a preset time period; and performing an air replenishment operation when the height reduction speed is greater than zero and less than a preset first speed threshold when the current vehicle state is a stationary state. When the speed is greater than or equal to the first speed threshold and less than a preset second speed threshold, a gas replenishment operation is performed on the gas tank and the first fault alarm operation is performed; when the altitude reduction speed is greater than the second speed threshold, a gas replenishment operation is performed on the gas tank and the preset second fault alarm operation is performed, or only the second fault alarm operation is performed; wherein the alarm level of the second fault alarm operation is higher than the alarm level of the first fault alarm operation; wherein the end condition for each execution of the gas replenishment operation is: the system gas volume is less than or equal to the first gas volume threshold and the system gas volume is greater than the preset second gas volume threshold.

[0013] Among them, the types of air replenishing operations include: performing an air replenishing operation on the gas spring in the air suspension system and performing an air replenishing operation on the air tank of the air suspension system; when the lifting performance state of the air suspension system is a slow rising state, the priority of the air replenishing operation performed on the gas spring is higher than the air replenishing operation performed on the air tank; when the lifting performance state of the air suspension system is a lifting failure state, the priority of the air replenishing operation performed on the gas spring is lower than the air replenishing operation performed on the air tank.

[0014] An embodiment of the present application also provides an air volume control device for an air suspension system, comprising: a detection module for detecting gas data of a preset air suspension system; a determination module for determining a lifting performance state of the air suspension system based on the gas data of the air suspension system; and a control module for performing air volume control on the air suspension system according to the lifting performance state of the air suspension system when an abnormality occurs in the lifting performance state of the air suspension system.

[0015] An embodiment of the present application also provides an air volume control device for an air suspension system, comprising: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; and at least one memory connected to the at least one bus, wherein the processor is configured to: execute an air volume control program for the air suspension system stored in the memory to implement any of the above-described air volume control methods for the air suspension system.

[0016] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are executed to implement any of the above-mentioned air volume control methods for the air suspension system.

[0017] The above technical solution provided by the embodiment of the present application has the following advantages over the prior art: the method provided by the embodiment of the present application can detect the gas data of the preset air suspension system; determine the lifting performance state of the air suspension system according to the gas data of the air suspension system; when the lifting performance state of the air suspension system is abnormal, perform air volume control on the air suspension system according to the lifting performance state of the air suspension system. The embodiment of the present application can intelligently control the air volume in the air suspension system, especially in the process of driving the vehicle, when the lifting performance state is abnormal, the air volume control can be dynamically performed to make the air volume in the air suspension system normal, which makes up for the problem of lack of air volume control scheme for the air suspension system during vehicle driving, and improves driving safety and comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0021] Figure 1 is a flow chart of an air volume control method of an air suspension system according to an embodiment of the present application;

[0022] Figure 2 is a schematic diagram of an air volume control method of an air suspension system according to an embodiment of the present application;

[0023] Figure 3 is a structural diagram of an air volume control device of an air suspension system according to an embodiment of the present application;

[0024] Figure 4 4 is a structural diagram of an air volume control device of an air suspension system according to an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, 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 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 making creative work are within the scope of protection of this application.

[0026] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0027] The present application provides an air volume control method for an air suspension system. Figure 1 , which is a flow chart of an air volume control method of an air suspension system according to an embodiment of the present application.

[0028] Step S110, detecting gas data of a preset air suspension system.

[0029] Step S120: determining the lifting performance state of the air suspension system according to the gas data of the air suspension system.

[0030] Step S130 , when the lifting performance state of the air suspension system is abnormal, performing air volume control on the air suspension system according to the lifting performance state of the air suspension system.

[0031] The air suspension system includes a plurality of gas containing components. The gas containing components raise or lower the vehicle's body height by inflating or deflating. Furthermore, the types of gas containing components include, but are not limited to: a gas tank and a plurality of gas springs connected thereto. The gas tank can inflate or exhaust the gas springs it is connected to. The vehicle in which the air suspension system is located includes at least two drive shafts, each drive shaft is respectively connected to two wheels, and each wheel corresponds to a gas spring. The gas tank inflates the two gas springs corresponding to the same drive shaft, which can raise the body height corresponding to the drive shaft position. The gas tank exhausts the two gas springs corresponding to the same drive shaft, which can lower the body height corresponding to the drive shaft position.

[0032] Gas data includes but is not limited to: the system gas volume of the air suspension system and the gas tank pressure of the air suspension system. The system gas volume refers to the total gas volume of the air suspension system. The gas tank pressure refers to the gas pressure of the gas tank in the air suspension system.

[0033] The lifting performance status refers to whether the air suspension system can rise and fall at the calibrated rate. Generally speaking, the air suspension system can only rise and fall at the calibrated rate if the system gas volume is within the normal range; in the case of leakage, the rising rate of the air suspension system will be reduced. If the leakage is too large, there will be insufficient gas in the gas tank to replenish the gas spring, and the air suspension system will not be able to adjust. In the case of excessive system gas volume, the descent rate of the air suspension system will be reduced. The calibrated rate refers to the pre-set lifting and lowering rate.

[0034] When the air suspension system cannot rise or fall at the calibrated rate, it indicates that the lifting performance of the air suspension system is abnormal. At this time, according to the type of lifting performance, such as: the rising rate is reduced, the upgrade cannot be performed, and the descent rate is reduced, the corresponding air volume control is performed on the air suspension system. For example, when the rising rate of the air suspension system is reduced and it cannot be raised or lowered, the air suspension system is supplemented with air, and when the descent rate of the air suspension system is reduced, the air suspension system is exhausted.

[0035] In an embodiment of the present application, the gas data of a preset air suspension system is detected; the lifting performance state of the air suspension system is determined according to the gas data of the air suspension system; when the lifting performance state of the air suspension system is abnormal, the air volume control of the air suspension system is performed according to the lifting performance state of the air suspension system. The embodiment of the present application can intelligently control the air volume in the air suspension system, especially in the process of driving a vehicle, when the lifting performance state is abnormal, the air volume control can be dynamically performed to make the air volume in the air suspension system normal, which makes up for the problem of lack of air volume control scheme for the air suspension system during vehicle driving, and improves driving safety and comfort.

[0036] In an embodiment of the present application, the gas data of the preset air suspension system can be detected after the vehicle is started. Further, the gas data of the air suspension system can be preset during the driving of the vehicle. The gas data includes but is not limited to: the system gas volume of the air suspension system and the gas tank pressure of the air suspension system.

[0037] In the embodiment of the present application, detecting the system gas volume of the air suspension system includes: detecting the effective volume and gas pressure of the container corresponding to each gas containing component; detecting the gas temperature corresponding to each gas containing component; obtaining the gas mole number and gas constant corresponding to each gas containing component; for each gas containing component, determining the gas volume of the gas containing component according to the effective volume of the container, gas mole number, gas constant, gas temperature and gas pressure corresponding to the gas containing component; calculating the sum of the gas volumes of each gas containing component as the system gas volume of the air suspension system. Among them, the gas mole number and the gas constant are both preset fixed values. Generally speaking, the gas constant is 8.314. Each gas containing component corresponds to the same gas temperature. When the type of the gas containing component is a gas tank, the gas pressure of the gas containing component is the gas tank pressure of the air suspension system, that is, in the process of detecting the system gas volume of the air suspension system, the gas tank pressure of the air suspension system can be detected. Further, since the effective volume and gas pressure of the container corresponding to different gas containing components are different, it is necessary to detect the effective volume and gas pressure of the container corresponding to each gas containing component separately.

[0038] When detecting the effective volume of the container, if the type of gas containing component is a gas tank, the effective volume of the container corresponding to the gas tank is obtained. This is because the gas tank does not involve deformation and the volume is fixed, so it is sufficient to detect the effective volume of the container corresponding to the gas tank once in advance. If the type of gas containing component is an air spring, a height sensor is used to detect the actual height of the vehicle body; based on the actual height of the vehicle body, the elastic deformation stroke of the air spring is calculated; based on the elastic deformation stroke of the air spring, the effective volume of the container in the air spring is queried in the preset stroke-volume comparison table. Among them, the elastic deformation stroke refers to the stretching or compression stroke (such as height) of the gas spring relative to the preset initial position. The stroke-volume comparison table is a pre-recorded effective volume of the container corresponding to each elastic deformation stroke.

[0039] When detecting the gas temperature, the temperature sensor of the vehicle air conditioner is used to detect the outdoor ambient temperature, and the preset weight value is used to perform weighted calculation on the outdoor ambient temperature to obtain the gas temperature. Furthermore, for multiple gas containing components, the gas temperature can be detected only once.

[0040] When detecting the gas pressure, a preset pressure sensor is used to detect the gas pressure in the gas containing component. Furthermore, a pressure sensor connected to each gas containing component is pre-set in the vehicle, so that the pressure sensor is sequentially connected to each gas containing component to sequentially detect the gas pressure of each gas containing component. For example: sequentially detect the gas pressure of the left front gas spring, the right front gas spring, the left rear gas spring, the right rear gas spring and the gas tank.

[0041] In the embodiment of the present application, the gas volume of each gas containing component can be determined by using a preset gas volume calculation formula. For example, the gas volume calculation formula is: V = nRT / P; V represents the effective volume of the container; n represents the number of gas moles; R represents the gas constant; T represents the gas temperature; and P represents the gas pressure.

[0042] In an embodiment of the present application, the gas data of the air suspension system can be detected when a preset time node arrives. Wherein, the time node includes: a preset first moment before the vehicle height adjustment, a preset second moment after the vehicle height adjustment, and / or a preset third moment after the vehicle switches to the parking gear. Wherein, the first moment, the second moment and the third moment are all values ​​greater than or equal to 0. The specific values ​​of the first moment, the second moment and the third moment are all empirical values ​​or values ​​obtained through experiments. In this way, after receiving the vehicle height adjustment instruction, the gas data is detected once at the first moment (such as the first 0.5 seconds) before the vehicle height adjustment is performed according to the vehicle height adjustment instruction, so that the vehicle height adjustment can be carried out smoothly; at the second moment after the vehicle height adjustment is performed according to the vehicle height adjustment instruction, the gas data is detected once, and the newly formed gas data after the vehicle height adjustment can be obtained; during the vehicle driving process, at the third moment after the vehicle gear is detected to be switched to the parking gear (P gear), if it is detected that the vehicle gear is switched to the P gear, the gas data is detected once immediately, so that the gas data after the vehicle is stable in the static state can be obtained. By detecting the gas data at the above three time nodes, the gas volume control can be made more accurate.

[0043] In the embodiment of the present application, after the gas data of the air suspension system is detected, it is necessary to determine the lifting performance state of the air suspension system according to the gas data of the air suspension system.

[0044] In the embodiment of the present application, the types of lifting performance states include but are not limited to: a slow lowering state, a normal lifting state, a slow raising state, and a lifting failure state. The slow lowering state indicates that the lowering rate of the air suspension system is slower than the calibrated rate. The normal lifting state indicates that the lifting rate of the air suspension system is normal. The slow raising state indicates that the lowering speed of the air suspension system is slower than the calibrated rate. The lifting failure state indicates that the air suspension system cannot perform lifting control. The calibrated rate is a preset lifting rate. The user feels most comfortable when lifting and lowering according to the calibrated rate.

[0045] When the system gas volume is greater than a preset first gas volume threshold, the lifting performance state of the air suspension system is determined to be a slow lowering state; when the system gas volume is less than or equal to the first gas volume threshold and the system gas volume is greater than a preset second gas volume threshold, the lifting performance state of the air suspension system is determined to be a normal lifting state; when the system gas volume is less than or equal to the second gas volume threshold and the gas tank pressure is greater than or equal to the preset pressure threshold, the lifting performance state of the air suspension system is determined to be a slow rising state; when the system gas volume is less than or equal to the second gas volume threshold and the gas tank pressure is less than the pressure threshold, the lifting performance state of the air suspension system is determined to be a lifting failure state; wherein the slow lowering state, the slow rising state and the lifting failure state are abnormal lifting performance states. The first gas volume threshold, the second gas volume threshold and the pressure threshold are all empirical values ​​or values ​​obtained through experiments.

[0046] In the embodiment of the present application, after determining the lifting performance state of the air suspension system, the flag value corresponding to the current lifting performance state can be recorded; wherein different lifting performance states correspond to different flag values. Further, when the lifting performance state is a slow lowering state, the flag position is a first value; when the lifting performance state is a normal lifting state, the flag position is a second value; when the lifting performance state is a slow raising state, the flag position is a third value; when the lifting performance state is a lifting failure state, the flag position is a fourth value. For example: the first value is 0, the second value is 1, the third value is 2, and the fourth value is 3.

[0047] For example: the first gas volume threshold is set to 150, the second gas volume threshold is set to 130, and the pressure threshold is set to 4 bar;

[0048] When the system air volume is greater than 150, the system air volume is too high, and the lowering speed of the air suspension system is reduced. At this time, it can be determined that the air suspension system is in a slow lowering state, and the mark position is 0;

[0049] When 130<system air volume≤150, the system air volume is normal, and the air suspension system can be raised and lowered normally. At this time, it can be determined that the lifting performance state of the air suspension system is a normal lifting state, and the mark position is 1;

[0050] When the system gas volume is ≤130 and the gas tank pressure is ≥4bar, the system gas volume is low and the air suspension system lifting rate is reduced. At this time, it can be determined that the air suspension system is in a slow lifting state, and the mark position is 2;

[0051] When the system gas volume is ≤130 and the gas tank pressure is <4bar, the system gas volume is too low and the air suspension system cannot be adjusted. At this time, it can be determined that the lifting performance status of the air suspension system is a lifting failure status, and the mark position is 3.

[0052] In the embodiment of the present application, after an abnormal lifting performance state occurs, it is necessary to perform air volume control on the air suspension system. When the lifting performance state of the air suspension system is a slow lowering state, the air suspension system is controlled to exhaust; when the lifting performance state of the air suspension system is a slow rising state or a lifting failure state, the air suspension system is controlled to replenish air. Further, when the lifting performance state of the air suspension system is a slow lowering state, it means that the air volume in the air suspension system is large. In order not to affect the descent rate of the air suspension system, part of the air volume in the air suspension system can be discharged to improve the comfort of the lifting of the air suspension system. When the lifting performance state of the air suspension system is a slow rising state or a lifting failure state, it means that the air volume in the air suspension system is small or too small. At this time, the air suspension system can be replenished with air. By replenishing air, the air suspension system can temporarily maintain stability and safety, providing users with time to drive the vehicle to a safe area in a stable state.

[0053] The exhaust control for the air suspension system includes: when the lifting performance state of the air suspension system is a slow lowering state, opening the exhaust valve of the air suspension system; when it is detected that the system gas volume is less than or equal to the first gas volume threshold and the system gas volume is greater than the second gas volume threshold, closing the exhaust valve of the air suspension system. The exhaust valve is used to control the exhaust of gas in the air suspension system. After the exhaust valve is opened, the gas in the air suspension system will be gradually discharged into the external environment until the lifting performance state of the air suspension system is a normal upgrading state, and then the exhaust valve is closed.

[0054] The air replenishment control for the air suspension system includes: when the lifting performance state of the air suspension system is a slow lifting state or a lifting failure state, obtaining the current vehicle body gear height; for each drive shaft of the vehicle, detecting the real vehicle body height corresponding to the drive shaft; performing the air replenishment operation on the air suspension system according to the vehicle body gear height and the real vehicle body height corresponding to the drive shaft. Further, the vehicle body gear height refers to the height that the vehicle body should have under the corresponding suspension gear. Among them, multiple suspension gears are pre-set, and each suspension gear corresponds to a vehicle body gear height; when adjusting the vehicle body height, the vehicle body heights at the front and rear of the vehicle are adjusted to the vehicle body gear height corresponding to the currently selected suspension gear. The real vehicle body height corresponding to the drive shaft refers to: under the currently selected suspension gear, the average value of the real vehicle body heights corresponding to the two tires connected to the drive shaft. Furthermore, the following operations can be performed for each drive shaft: for each wheel connected to the drive shaft, a height sensor is set between the wheel center and the wheel arch corresponding to the wheel; the height value detected by the height sensor is used as the vehicle body height value corresponding to the wheel; the average value of the vehicle body height values ​​corresponding to the two wheels connected to the drive shaft is calculated as the actual vehicle body height corresponding to the drive shaft.

[0055] In an embodiment of the present application, performing an air replenishment operation on the air suspension system includes: performing an air replenishment operation on the gas spring in the air suspension system and performing an air replenishment operation on the gas tank of the air suspension system. Wherein, when the lifting performance state of the air suspension system is a slow rising state, the priority of the air filling operation performed on the gas spring is higher than the air filling operation performed on the gas tank; when the lifting performance state of the air suspension system is a lifting failure state, the priority of the air filling operation performed on the gas spring is lower than the air filling operation performed on the gas tank. Further, when the lifting performance state of the air suspension system is a slow rising state, the air leakage problem of the air suspension system is not serious, so the gas spring is replenished with air first, the air suspension system is leveled, the stability of the air suspension system is ensured, and the discomfort caused by the collapse of the air suspension system leakage position is avoided. When the lifting performance state of the air suspension system is a lifting failure state, the air leakage problem of the air suspension system is more serious, so the air tank is replenished with air first, which is equivalent to increasing the system air volume in the air suspension system to avoid the danger caused by serious air leakage of the air suspension system.

[0056] Performing a gas filling operation on the gas spring in the air suspension system includes: for each driving shaft of the vehicle, determining the deviation value between the actual height of the vehicle body corresponding to the driving shaft and the height of the vehicle body gear; when the deviation value is greater than the difference threshold corresponding to the current vehicle state, performing a gas filling operation on the gas spring corresponding to the driving shaft until the deviation value between the actual height of the vehicle body corresponding to the driving shaft and the height of the vehicle body gear is less than or equal to the difference threshold. Further, the deviation value refers to the absolute value of the difference between the actual height of the vehicle body and the height of the vehicle body gear. The difference threshold is used to measure whether the air suspension system needs to be leveled. For example, if the deviation value corresponding to one driving shaft of the vehicle is greater than the difference threshold, and the deviation value corresponding to one driving shaft is less than the difference threshold, it means that the vehicle has tilted due to leakage in the air suspension system. The difference threshold is an empirical value or a value obtained through experiments. The vehicle state includes a stationary state and a driving state. The stationary state and the driving state correspond to different difference thresholds. The difference threshold corresponding to the stationary state is less than the difference threshold corresponding to the driving state.

[0057] For example: the difference threshold corresponding to the stationary state is 10mm, and the difference threshold corresponding to the driving state is 15mm; the following operations are performed for each drive shaft: in the stationary state (vehicle speed = 0kph), the height information detected by the height sensor is used to monitor the height of the drive shaft center point (that is, monitor the average value of the actual vehicle body height corresponding to the two tires connected to the drive shaft). When the deviation value between the actual vehicle body height and the vehicle body gear height corresponding to the current gear position exceeds 10mm, the air suspension system actively issues a height leveling request, and inflates the gas spring according to the height leveling request to compensate for the deviation height and level the vehicle body height to the vehicle body gear height corresponding to the current suspension gear position. When driving (vehicle speed>0kph), the height information detected by the height sensor is used to monitor the height of the drive shaft center point. Taking into account the large height fluctuations caused by road excitation during dynamic driving, when the deviation between the actual vehicle height and the vehicle gear height corresponding to the current suspension gear exceeds 15mm, the air suspension system actively issues a height leveling request. According to the height leveling request, the gas spring is inflated to compensate for the deviation height and level the vehicle height to the vehicle gear height corresponding to the current suspension gear.

[0058] The air filling operation for the air tank of the air suspension system includes: for each drive shaft of the vehicle, determining the height reduction speed of the drive shaft according to the change of the actual height of the vehicle body corresponding to the drive shaft; potential small leakage scenario: when the height reduction speed is greater than zero and less than a preset first speed threshold, and the current vehicle state is a stationary state, performing an air filling operation on the air tank of the air suspension system and accumulating the number of air filling operations; wherein, within a preset time period, when the number of air filling operations reaches a preset number, performing a preset first fault alarm operation; potential medium leakage scenario: when the height reduction speed is greater than or equal to the first In the case where the height reduction speed exceeds a preset speed threshold and is less than a preset second speed threshold, a gas replenishment operation is performed on the gas tank and the first fault alarm operation is performed; potential large leakage scenario: when the height reduction speed is greater than the second speed threshold, a gas replenishment operation is performed on the gas tank and a preset second fault alarm operation is performed, or only the second fault alarm operation is performed; wherein the alarm level of the second fault alarm operation is higher than the alarm level of the first fault alarm operation; wherein the end condition for each execution of the gas replenishment operation is: the system gas volume is less than or equal to the first gas volume threshold and the system gas volume is greater than the preset second gas volume threshold.

[0059] The height reduction speed refers to the speed at which the real height of the vehicle body is reduced. When a leak occurs, the real height of the vehicle body corresponding to the leak will be reduced. The faster the height reduction speed, the more serious the air leakage problem of the air suspension system; the slower the height reduction speed, the less serious the air leakage problem of the air suspension system. Furthermore, the real height of the vehicle body can be compared with the gear height of the vehicle body in real time. If the real height of the vehicle body is less than the gear height of the vehicle body, the real height of the vehicle body and the detection time are recorded at each detection time period, and the height reduction speed is calculated based on the recorded multiple sets of real heights and detection times of the vehicle body. For example: subtract the minimum real height of the vehicle body from the recorded maximum real height of the vehicle body to obtain the vehicle height change value; subtract the detection time corresponding to the minimum real height of the vehicle body from the detection time corresponding to the maximum real height of the vehicle body to obtain the vehicle height change time; divide the vehicle height change value by the vehicle height change time to obtain the height reduction speed.

[0060] The first speed threshold and the second speed threshold are used to measure the speed of air leakage. The first speed threshold and the second speed threshold are empirical values ​​or values ​​obtained through experiments. For example: the first speed threshold is set to 0.1mm / min, and the second speed threshold is set to 0.5mm / min. In this way, when 0<height reduction speed<0.1mm / min, it is determined as a potential small leakage scene; when 0.1mm / min≤height reduction speed<0.5mm / min, it is determined as a potential medium leakage scene; when the height reduction speed ≥0.5mm / min, it is determined as a potential large leakage scene.

[0061] The first fault warning operation is used to remind the user that the air suspension system needs to be repaired as soon as possible. For example, the first fault warning operation controls the warning light to be yellow. The second fault warning operation is used to remind the user that the air suspension system needs to be repaired immediately. For example, the second fault warning operation controls the warning light to be red.

[0062] When the height reduction speed is greater than zero and less than the first speed threshold, it is a small leakage scenario and can support short-term driving. The air tank can be refilled when the vehicle stops (stationary state). When the number of refilling operations exceeds three times within 24 hours, the yellow light reminds the user to repair the air suspension system as soon as possible.

[0063] When the height reduction speed is greater than or equal to the first speed threshold and less than the second speed threshold, it is a medium leakage scenario. The user can sense the leakage and can refill the air tank while driving to maintain short-term driving. The yellow light will prompt the user to repair the air suspension system as soon as possible.

[0064] When the height reduction speed is greater than the second speed threshold, it is a large leakage scenario, the leakage effect is obviously perceptible, and the leakage speed is extremely fast. In this case, the air tank cannot be refilled in time, and a red light can be displayed to remind the user that for safety reasons, the air suspension system should be repaired immediately.

[0065] A more specific example is provided below to illustrate the air volume control method of the air suspension system of the embodiment of the present application. Figure 2 , which is a schematic diagram of an air volume control method for an air suspension system according to an embodiment of the present application.

[0066] Based on the gas data detected last time, determine the flag position corresponding to the lifting performance status.

[0067] When the flag bit of the lifting performance status is 0, that is, when the lifting performance status is in a slow lowering state, the exhaust valve is opened to automatically exhaust the gas until the system gas volume is within a normal range.

[0068] When the flag bit of the lifting performance state is 1, that is, when the lifting performance state is in the normal lifting state, no processing is performed. Among them, the flag bit is 0 or 1 for a non-leakage scenario. Figure 2 The processing for the non-leakage scenario is not shown.

[0069] When the flag bit of the lifting performance status is 2, that is, when the lifting performance status is in the slow lifting status, if it is determined that the current scenario is a potential small leakage, when the vehicle speed is 0, the air suspension system starts to be replenished, and during the replenishment process, the priority of replenishing the air spring (height leveling) is higher than the priority of replenishing the air tank, and the timer is started. If the number of replenishment operations exceeds 3 times within 24 hours, a yellow light alarm prompt is reported, and the timer is automatically reset every 24 hours; if it is determined that the current scenario is a potential medium leakage, the air suspension system is immediately replenished, and during the replenishment process, the priority of replenishing the air spring is higher than the priority of replenishing the air tank, and a yellow light alarm prompt is reported; if it is determined that the current scenario is a potential large leakage, the air suspension system is immediately replenished, and during the replenishment process, the priority of replenishing the air spring is higher than the priority of replenishing the air tank, and a red light fault prompt is reported. Furthermore, when the air suspension system is replenished with air, it is detected whether a height leveling request is received. If a height leveling request is received, the height leveling operation is performed, that is, the air spring is replenished with air; if no height leveling request is received, the air tank replenishing operation is performed, that is, the air tank is replenished with air.

[0070] When the flag bit of the lifting performance status is 3, that is, when the lifting performance status is the lifting failure status, if it is determined that the current scenario is a potential small leakage, when the vehicle speed is 0, the air suspension system starts to be replenished with air, and during the replenishment process, because the gas in the current gas tank is too low to support height leveling, the priority of replenishing the air spring is lower than the priority of replenishing the gas tank, and the timer is started. If the number of replenishment operations exceeds 3 times within 24 hours, a yellow light alarm is given, and the timer is automatically reset every 24 hours; if it is determined that the current scenario is a potential medium leakage, the air suspension system is immediately replenished with air, and during the replenishment process, the priority of replenishing the air spring is lower than the priority of replenishing the gas tank, and a yellow light alarm is given; if it is determined that the current scenario is a potential large leakage, replenishing the air suspension system is prohibited and a red light alarm is given immediately.

[0071] The embodiment of the present application proposes a method of replenishing air to maintain vehicle driving after the air suspension system leaks. For small, medium and large leakage scenarios, the air replenishment and leveling strategies are controlled by software, so that the vehicle can drive in a stable state to a safe area.

[0072] An embodiment of the present application also provides an air volume control device for an air suspension system. Figure 3 is a structural diagram of an air volume control device of an air suspension system according to an embodiment of the present application.

[0073] The air volume control device of the air suspension system comprises:

[0074] The detection module 310 is used to detect gas data of a preset air suspension system.

[0075] The determination module 320 is used to determine the lifting performance state of the air suspension system according to the gas data of the air suspension system.

[0076] The control module 330 is used to perform air volume control on the air suspension system according to the lifting performance state of the air suspension system when the lifting performance state of the air suspension system is abnormal.

[0077] The functions of the device described in the embodiment of the present application have been described in the above method embodiment. Therefore, for any details not provided in the description of this embodiment, please refer to the relevant descriptions in the above embodiment and will not be repeated here.

[0078] The present application also provides an air volume control device for an air suspension system. Figure 4 is a structural diagram of an air volume control device of an air suspension system according to an embodiment of the present application.

[0079] The air volume control device of the air suspension system includes: a processor 410 , a communication interface 420 , a memory 430 and a communication bus 440 . The processor 410 , the communication interface 420 , and the memory 430 communicate with each other through the communication bus 440 .

[0080] The memory 430 is used to store computer programs.

[0081] In one embodiment of the present application, the processor 410, when executing the program stored in the memory 430, implements the air volume control method of the air suspension system provided by any one of the aforementioned method embodiments, including: detecting gas data of a preset air suspension system; determining the lifting performance state of the air suspension system according to the gas data of the air suspension system; when the lifting performance state of the air suspension system is abnormal, performing air volume control on the air suspension system according to the lifting performance state of the air suspension system.

[0082] Wherein, the detecting of the gas data of the air suspension system includes: when a preset time node arrives, detecting the system gas volume of the air suspension system and the air tank pressure of the air suspension system; wherein, the time node includes: a preset first moment before the vehicle body height is adjusted, a preset second moment after the vehicle body height is adjusted, and / or a preset third moment after the vehicle is switched to the parking gear.

[0083] Wherein, determining the lifting and lowering performance state of the air suspension system according to the gas data of the air suspension system includes: when the system gas volume is greater than a preset first gas volume threshold, determining that the lifting and lowering performance state of the air suspension system is a slow lowering state; when the system gas volume is less than or equal to the first gas volume threshold and the system gas volume is greater than a preset second gas volume threshold, determining that the lifting and lowering performance state of the air suspension system is a normal lifting and lowering state; when the system gas volume is less than or equal to the second gas volume threshold and the gas tank pressure is greater than or equal to a preset pressure threshold, determining that the lifting and lowering performance state of the air suspension system is a slow rising state; when the system gas volume is less than or equal to the second gas volume threshold and the gas tank pressure is less than the pressure threshold, determining that the lifting and lowering performance state of the air suspension system is a lifting and lowering failure state; wherein the slow lowering state, the slow rising state and the lifting and lowering failure state are abnormal lifting performance states.

[0084] Among them, the air volume control of the air suspension system is performed according to the lifting performance state of the air suspension system, including: when the lifting performance state of the air suspension system is a slow lowering state, opening the exhaust valve of the air suspension system; when it is detected that the system air volume is less than or equal to the first air volume threshold and the system air volume is greater than the second air volume threshold, closing the exhaust valve of the air suspension system.

[0085] Among them, the air volume control of the air suspension system is performed according to the lifting performance state of the air suspension system, including: when the lifting performance state of the air suspension system is a slow rising state or a lifting failure state, obtaining the current vehicle body gear height; for each drive shaft of the vehicle, detecting the actual vehicle body height corresponding to the drive shaft; and performing an air replenishment operation on the air suspension system according to the vehicle body gear height and the actual vehicle body height corresponding to the drive shaft.

[0086] Among them, the air replenishing operation is performed on the air suspension system according to the vehicle body gear height and the actual vehicle body height corresponding to the drive shaft, including: for each drive shaft of the vehicle, determining the deviation value between the actual vehicle body height corresponding to the drive shaft and the vehicle body gear height; when the deviation value is greater than the difference threshold corresponding to the current vehicle state, performing an inflation operation on the gas spring corresponding to the drive shaft until the deviation value between the actual vehicle body height corresponding to the drive shaft and the vehicle body gear height is less than or equal to the difference threshold.

[0087] The method comprises: performing an air replenishment operation on the air suspension system according to the vehicle gear height and the real vehicle height corresponding to the drive shaft, comprising: determining the height reduction speed of the drive shaft according to the change of the real vehicle height corresponding to the drive shaft for each drive shaft of the vehicle; performing an air replenishment operation on the air tank of the air suspension system and accumulating the number of air replenishment operations when the height reduction speed is greater than zero and less than a preset first speed threshold and the current vehicle state is a stationary state; performing a preset first fault warning operation when the number of air replenishment operations reaches a preset number within a preset time period; and performing an air replenishment operation when the height reduction speed is greater than zero and less than a preset first speed threshold when the current vehicle state is a stationary state. When the speed is greater than or equal to the first speed threshold and less than a preset second speed threshold, a gas replenishment operation is performed on the gas tank and the first fault alarm operation is performed; when the altitude reduction speed is greater than the second speed threshold, a gas replenishment operation is performed on the gas tank and the preset second fault alarm operation is performed, or only the second fault alarm operation is performed; wherein the alarm level of the second fault alarm operation is higher than the alarm level of the first fault alarm operation; wherein the end condition for each execution of the gas replenishment operation is: the system gas volume is less than or equal to the first gas volume threshold and the system gas volume is greater than the preset second gas volume threshold.

[0088] Among them, the types of air replenishing operations include: performing an air replenishing operation on the gas spring in the air suspension system and performing an air replenishing operation on the air tank of the air suspension system; when the lifting performance state of the air suspension system is a slow rising state, the priority of the air replenishing operation performed on the gas spring is higher than the air replenishing operation performed on the air tank; when the lifting performance state of the air suspension system is a lifting failure state, the priority of the air replenishing operation performed on the gas spring is lower than the air replenishing operation performed on the air tank.

[0089] The embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the air volume control method of the air suspension system provided in any of the above method embodiments are implemented. Since the air volume control method of the air suspension system has been described in detail above, the details not detailed in the description of this embodiment can be referred to the relevant descriptions in the above embodiments, and will not be repeated here.

[0090] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0091] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0092] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0093] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for controlling the air volume of an air suspension system, It is characterized in that include: Detect gas data of preset air suspension system; determining a lifting performance state of the air suspension system according to gas data of the air suspension system; When the lifting performance state of the air suspension system is abnormal, air volume control is performed on the air suspension system according to the lifting performance state of the air suspension system.

2. The method according to claim 1, It is characterized in that The detecting of gas data of the air suspension system comprises: When a preset time node arrives, the system air volume of the air suspension system and the air tank pressure of the air suspension system are detected; wherein the time node includes: a preset first moment before the vehicle body height is adjusted, a preset second moment after the vehicle body height is adjusted, and / or a preset third moment after the vehicle is switched to a parking gear.

3. The method according to claim 2, It is characterized in that Determining the lifting performance state of the air suspension system according to the gas data of the air suspension system includes: When the system air volume is greater than a preset first air volume threshold, determining that the lifting performance state of the air suspension system is a slow lowering state; When the system air volume is less than or equal to the first air volume threshold and the system air volume is greater than a preset second air volume threshold, determining that the lifting performance state of the air suspension system is a normal lifting state; When the system air volume is less than or equal to the second air volume threshold and the air tank air pressure is greater than or equal to a preset air pressure threshold, determining that the lifting performance state of the air suspension system is a slow lifting state; When the system gas volume is less than or equal to the second gas volume threshold and the gas tank pressure is less than the gas pressure threshold, determining that the lifting performance state of the air suspension system is a lifting failure state; Among them, the slow lowering state, the slow raising state and the lifting failure state are abnormal lifting performance states.

4. The method according to claim 3, It is characterized in that The performing air volume control on the air suspension system according to the lifting performance state of the air suspension system comprises: When the lifting performance state of the air suspension system is a slow lowering state, opening the exhaust valve of the air suspension system; When it is detected that the system air volume is less than or equal to the first air volume threshold and the system air volume is greater than the second air volume threshold, the exhaust valve of the air suspension system is closed.

5. The method according to claim 3, It is characterized in that The performing air volume control on the air suspension system according to the lifting performance state of the air suspension system comprises: When the lifting performance state of the air suspension system is a slow lifting state or a lifting failure state, obtaining a current vehicle body gear height; For each drive shaft of the vehicle, detecting the actual height of the vehicle body corresponding to the drive shaft; The air suspension system is operated to replenish air according to the gear height of the vehicle body and the actual height of the vehicle body corresponding to the driving shaft.

6. The method according to claim 5, It is characterized in that The step of performing an air replenishment operation on the air suspension system according to the vehicle body gear height and the actual vehicle body height corresponding to the drive shaft includes: For each drive shaft of the vehicle, determining a deviation value between a real vehicle height corresponding to the drive shaft and a gear height of the vehicle; When the deviation value is greater than the difference threshold corresponding to the current vehicle state, an inflation operation is performed on the gas spring corresponding to the drive shaft until the deviation value between the actual vehicle height corresponding to the drive shaft and the vehicle gear height is less than or equal to the difference threshold.

7. The method according to claim 5, It is characterized in that The step of performing an air replenishment operation on the air suspension system according to the vehicle body gear height and the actual vehicle body height corresponding to the drive shaft includes: For each drive shaft of the vehicle, determining a height reduction speed of the drive shaft according to a change in a real vehicle body height corresponding to the drive shaft; When the height reduction speed is greater than zero and less than a preset first speed threshold, and the current vehicle state is a stationary state, a gas replenishment operation is performed on the gas tank of the air suspension system and the number of gas replenishment operations is accumulated; wherein, within a preset time period, when the number of gas replenishment operations reaches a preset number, a preset first fault warning operation is performed; When the height reduction speed is greater than or equal to the first speed threshold and less than a preset second speed threshold, performing a gas replenishment operation on the gas tank and performing the first fault alarm operation; When the altitude reduction speed is greater than the second speed threshold, a gas replenishment operation is performed on the gas tank and a preset second fault warning operation is performed, or only the second fault warning operation is performed; wherein the warning level of the second fault warning operation is higher than the warning level of the first fault warning operation; Wherein, the end condition of each execution of the gas replenishment operation is: the system gas volume is less than or equal to the first gas volume threshold and the system gas volume is greater than a preset second gas volume threshold.

8. The method according to claim 5, It is characterized in that The types of the air replenishment operation include: performing an air replenishment operation on a gas spring in the air suspension system and performing an air replenishment operation on an air tank of the air suspension system; When the lifting performance state of the air suspension system is a slow lifting state, the priority of the inflation operation performed on the gas spring is higher than the gas replenishment operation performed on the gas tank; When the lifting performance state of the air suspension system is a lifting failure state, the priority of the inflation operation performed on the gas spring is lower than the gas replenishment operation performed on the gas tank.

9. An air volume control device for an air suspension system, It is characterized in that include: A detection module, used for detecting gas data of a preset air suspension system; A determination module, configured to determine a lifting performance state of the air suspension system according to gas data of the air suspension system; The control module is used to perform air volume control on the air suspension system according to the lifting performance state of the air suspension system when the lifting performance state of the air suspension system is abnormal.

10. An air volume control device for an air suspension system, It is characterized in that include: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; At least one memory connected to the at least one bus, wherein the processor is configured to: execute an air volume control program of the air suspension system stored in the memory to implement the air volume control method of the air suspension system according to any one of claims 1-8.

Images