Active suspension air supply system, control method thereof and computer readable storage medium

Abstract

The invention discloses a control method of an active suspension air supply system, the active suspension air supply system and a computer readable storage medium. The control method of the active suspension air supply system comprises the steps that the external humidity value of a vehicle is obtained; determining that the external humidity value is smaller than a preset first humidity threshold value; acquiring an internal humidity value of the air supply system; determining that the internal humidity value is greater than or equal to a preset second humidity threshold value; and back-blowing the drying agent. The external humidity value is detected, whether the external humidity value is smaller than the preset first humidity value or not is judged, then the situation that the back flushing effect is not ideal or even negative is eliminated, the problem that the back flushing effect of the drying agent is not ideal is solved, and the purpose that moisture of the drying agent is better discharged out of an internal system through back flushing of the drying agent is achieved.

Description

Technical Field

[0001] The present invention relates to the field of active suspension air supply systems, and particularly to a control method for an active suspension air supply system, an active suspension air supply system, and a computer-readable storage medium. Background Art

[0002] An active suspension air supply system can actively form compressed air through an air compressor according to road conditions and send the compressed air to an air spring device to adjust the vehicle body height. The air compressor can draw air from the atmosphere, and the air contains water vapor. During the compression process of the air, the water vapor will liquefy. After passing through the desiccant, there will still be some moisture accumulating inside the system. After the air supply system works for a period of time, the water absorption capacity of the desiccant reaches the upper limit, and the drying function of the desiccant fails. At the same time, it may cause the failure of other actuating components, such as corrosion. Therefore, the desiccant usually needs to be regenerated regularly to prevent the drying function of the desiccant from failing.

[0003] Currently, in the active suspension air supply system, the compressed air is dried by the desiccant, and the desiccant is backflushed by exhausting air. For example, the high-pressure gas in the air storage tank or the air spring assembly flows through the desiccant in a reverse path, so as to bring the moisture in the desiccant to the atmosphere and realize the regeneration of the drying capacity. However, when the desiccant is backflushed, there is a problem that the backflushing effect of the desiccant is not ideal. Summary of the Invention

[0004] The main object of the present invention is to provide a control method for an active suspension air supply system, an active suspension air supply system, and a computer-readable storage medium, aiming to solve the problem that the backflushing effect of the desiccant is not ideal in some cases.

[0005] The second object of the present invention is to propose a computer-readable storage medium, on which a drying program based on the active suspension air supply system is stored. When the drying program of the active suspension air supply system is executed by a controller, the above-mentioned control method for the active suspension air supply system is realized.

[0006] The third object of the present invention is an active suspension air supply system, including a controller, and the controller is used to execute the control method for the active suspension air supply system as described above.

[0007] To achieve the above object, an embodiment of the present invention provides a control method for an active suspension air supply system, including: Obtaining an external humidity value of the vehicle; Determining that the external humidity value is less than a preset first humidity threshold; Obtaining an internal humidity value of the air supply system; Determining that the internal humidity value is greater than or equal to a preset second humidity threshold; Performing backflushing of the desiccant.

[0008] In one embodiment, after determining that the external humidity value is less than a preset first humidity threshold and before obtaining the internal humidity value of the air supply system, the following steps are further included: Obtain parameters related to noise; If it is determined that the parameters related to noise meet the preset conditions, then execute the step of obtaining the internal humidity value of the air supply system.

[0009] In one embodiment, the parameters related to noise are one or several of vehicle noise decibels, motor speed, vehicle speed, and torque.

[0010] In one embodiment, after determining that the external humidity value is less than a preset first humidity threshold and before obtaining the internal humidity value of the air supply system, the following steps are further included: Obtain parameters related to the environment outside the vehicle; Set the number of times of backwashing the desiccant according to the parameters related to the environment; The step of backwashing the desiccant is specifically: backwash the desiccant according to the number of backwashing times.

[0011] In one embodiment, the parameters related to the environment at least include the temperature and time outside the vehicle.

[0012] In one embodiment, the step of backwashing the desiccant further includes: If the number of times of backwashing the desiccant is less than the number of backwashing times, then obtain the internal air pressure of the air storage tank; If the internal air pressure of the air storage tank is less than the preset air pressure threshold; Start the air compressor to supplement the internal air pressure to be greater than or equal to the preset air pressure.

[0013] In one embodiment, the step of backwashing the desiccant further includes: If the number of times of backwashing the desiccant is less than the number of backwashing times, then after each backwashing stops, start the air compressor to pump air and execute the step of obtaining the internal humidity value of the air supply system.

[0014] In one embodiment, the step of backwashing the desiccant further includes: If the number of times of backwashing the desiccant is greater than the number of backwashing times and the internal humidity value is greater than or equal to the preset second humidity threshold; then give an alarm.

[0015] An active suspension air supply system provided by an embodiment of the present invention further includes: An external humidity sensor for detecting the air humidity outside the vehicle; An air storage tank for storing compressed air; A dryer having a desiccant therein; A distribution valve, which is respectively connected to the dryer and the air storage tank; An air compressor, which is connected to the dryer; An internal humidity sensor, which is arranged between the dryer and the distribution valve, or between the distribution valve and the air storage tank, and the internal humidity sensor is used to detect the humidity of the air after passing through the desiccant; and A controller, when the controller executes, it realizes the control method of the active suspension air supply system as described above.

[0016] In the technical solution of the present invention, by obtaining the external humidity value of the vehicle; determining that the external humidity value is less than a preset first humidity threshold; obtaining the internal humidity value of the air supply system; determining that the internal humidity value is greater than or equal to a preset second humidity threshold; and performing backwashing of the desiccant. If the humidity of the external air is too high, it will cause the backwashed desiccant to discharge part of the water vapor, and at the same time inhale part or more water vapor, so that the effect of the backwashed desiccant will be weakened, or even have a reverse effect. The present invention detects the external humidity value and judges whether the external humidity value is less than the preset first humidity value, thereby excluding the situation where the backwashing effect is not ideal or even has a negative effect, and realizing the purpose of making the water vapor of the desiccant better discharged from the internal system by backwashing the desiccant. Description of the Drawings

[0017] Figure 1 It is a flowchart of the control method of the active suspension air supply system according to an embodiment of the present invention; Figure 2 It is a flowchart of the control method of the active suspension air supply system according to another embodiment of the present invention; Figure 3 It is a flowchart of the control method of the active suspension air supply system according to still another embodiment of the present invention; Figure 4 It is Figure 3 The specific flowchart of a further embodiment in Figure 5 It is Figure 3 The specific flowchart of a further embodiment in Figure 6 It is the specific flowchart of the control method of the active suspension air supply system of the present invention; Figure 7 It is the specific flowchart of the active suspension air supply system according to an embodiment of the present invention.

[0018] The realization, functional characteristics and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed Embodiments

[0019] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] At present, the active suspension air supply system dries compressed air through a desiccant, and back blows the desiccant by exhausting air. For example, the high-pressure gas in the air storage tank or the air spring assembly flows through the desiccant in a reverse path, thereby bringing the moisture in the desiccant to the atmosphere and realizing the regeneration of the drying capacity. However, when the desiccant is back blown, there is a problem that the back blowing effect of the desiccant is not ideal.

[0021] The inventor found that in some cases, the internal humidity value of the vehicle's air supply system reaches a critical value, and it is necessary to back blow the desiccant to regenerate the desiccant, so as to ensure the drying function of the desiccant, avoid the failure of the drying function of the desiccant, and at the same time, it may cause the failure of other actuating components, such as corrosion.

[0022] However, in the above cases, the number of times the vehicle back blows the desiccant is too frequent, which does not match the number of times of back blowing the desiccant under normal circumstances. Even in extreme cases, back blowing is continuously carried out, so that the user thinks that the drying function of the desiccant has failed. However, the inventor detected after disassembly and found that although the water adsorption capacity of the desiccant has reached saturation, the regeneration function has not failed, that is, it can still be recycled after back blowing, that is, there is a problem that the operation of back blowing the desiccant cannot achieve an ideal effect.

[0023] The inventor also found that in the current process of back blowing the desiccant, it is not considered that after the air compressor back blows the desiccant, the air compressor actively sucks air from the external air to supplement. If the humidity of the external air is too high, it will cause some water vapor to be discharged during the back blowing of the desiccant, and some or more water vapor will be inhaled, so that the effect of back blowing the desiccant will be weakened or even have a reverse effect.

[0024] It can be understood that during the process of back blowing the desiccant, the factors affected by the external humidity are very hidden. Because the situation of high external humidity does not always exist; moreover, the desiccant itself has a certain water adsorption capacity, and the starting condition according to the internal humidity value of the air supply system is a lower threshold, that is, during this process, the desiccant can still continue to adsorb water, which leads to that even if occasionally the external humidity is high, the back blowing of the desiccant will not have a very intuitive manifestation, and the problem that the effect of back blowing the desiccant will be affected by the external air humidity cannot be found.

[0025] In other words, if the effect of back blowing the desiccant is taken as the standard when the external humidity is not greater than the internal humidity of the air supply system, then when the external humidity is greater than or equal to the internal humidity of the air supply system, the following situations exist: 1. The back blowing of the desiccant has an effect, but the effect is weakened.

[0026] 2. The effect of back blowing the desiccant is not obvious, and the discharged water vapor is close to the inhaled water vapor.

[0027] 3. The backflush desiccant has no effect, and the discharged water vapor is less than the inhaled water vapor.

[0028] Therefore, the present invention provides a control method for an active suspension air supply system to solve the above problems. In the first embodiment of the control method for the active suspension air supply system, referring to Figure 1 , the control method for the active suspension air supply system includes: S1. Obtain the external humidity value of the vehicle.

[0029] The external humidity value of the vehicle can be understood as the content of water vapor in the air. Humidity is usually expressed as a percentage, indicating the relative saturation degree of water vapor contained in the air. The external humidity value of the vehicle can be obtained through a humidity sensor installed on the vehicle surface. The external humidity value of the vehicle can be obtained through the windshield wiper at the front windshield of the vehicle or other sensors used to measure the external humidity at other positions. Such sensors usually use capacitance or resistance to measure the water vapor content in the environment and then convert it into an electrical signal for output. This signal can be transmitted to the vehicle controller via the CAN bus. In addition, some high-end models can also use an on-vehicle weather station to obtain a more accurate humidity value. Additionally, the current external humidity information can be obtained through weather forecasts or mobile applications, etc., so as to obtain the external humidity value within a general range.

[0030] S2. Determine that the external humidity value is less than a preset first humidity threshold.

[0031] Based on the fact that the external humidity value is less than the preset first humidity threshold, it can be inferred that the current environment is relatively dry and the humidity is low.

[0032] To determine whether the obtained external humidity value is less than the preset first humidity threshold, the following steps can be implemented: A humidity sensor needs to be installed outside the vehicle, and this sensor can monitor the external humidity value in real time. Transmit the humidity value obtained by the humidity sensor to the vehicle's internal control system via the CAN bus. Set the first humidity threshold in the vehicle's control system, and this threshold will be used as the basis for judging whether the external humidity meets the preset conditions. The control system will receive the humidity value transmitted by the sensor in real time and compare it with the preset first humidity threshold to determine whether the external humidity is less than the preset threshold. According to the judgment result, the vehicle control system can take corresponding actions.

[0033] The specific value of the first humidity threshold can be adjusted according to the actual vehicle model used.

[0034] S6. Obtain the internal humidity value of the air supply system.

[0035] S7. Determine that the internal humidity value is greater than or equal to a preset second humidity threshold.

[0036] S8. Blow back the desiccant.

[0037] Refer to Figure 7 , the active suspension air supply system includes an air compressor, a distribution valve, an air storage tank, an air spring device (not shown in the figure), and a controller; the air compressor includes a dryer and a compressor driven by an electric motor. The dryer is provided with a desiccant; the distribution valve is respectively connected to the dryer, the air storage tank, and the air spring device. The distribution valve is provided with a sensor, and the sensor can be connected to the gas pipeline connected to the distribution valve. The sensor is used to detect the internal humidity value of the air supply system.

[0038] CAN bus protocol (Controller Area Network), the CAN protocol is mainly used for communication between various different components in a vehicle. The controller (ECU, Electronic Control Unit), also known as the "vehicle computer" of the car, plays a crucial role during the driving process of the car. Its main function is to control the driving state of the car and realize various convenient functions.

[0039] To achieve this goal, the ECU mainly relies on various sensors and the data acquisition and exchange technology of the CAN bus protocol to judge the vehicle state and the driver's intention, and precisely control the car through actuators.

[0040] In modern cars, the application scope of the ECU is becoming more and more extensive. It can not only control core components such as the engine and braking system, but also adjust comfort functions such as air conditioning, seat adjustment, and window lifting. In addition, the ECU can also cooperate with intelligent devices such as in-vehicle navigation and communication systems to provide a convenient driving experience for the driver.

[0041] Specifically, the active suspension air supply system will actively form compressed air through the air compressor according to the road conditions and send the compressed air to the air spring device to realize the adjustment of the vehicle body height. The air compressor can draw air from the atmosphere. The air contains water vapor. During the compression process of the air, the water vapor will liquefy. After passing through the desiccant, there will still be some moisture accumulated inside the system. After the air supply system works for a period of time, the water absorption capacity of the desiccant reaches the upper limit, and the drying function of the desiccant fails. At the same time, it may cause the failure of other actuator components, such as corrosion. Therefore, the desiccant usually needs to be regenerated regularly to prevent the drying function of the desiccant from failing.

[0042] Currently, the active suspension air supply system dries the compressed air through a desiccant and blows back the desiccant by exhausting air. For example, the high-pressure gas in the air storage tank or the air spring assembly flows through the desiccant in a reverse path, thereby bringing the moisture in the desiccant to the atmosphere to realize the regeneration of the drying capacity.

[0043] Understandably, when the humidity outside the vehicle is relatively high, the active suspension air supply system blows back the desiccant. Since air replenishment operation needs to be actively carried out after blowing back the desiccant, and the air compressor sucks air from the atmosphere with relatively high humidity, as a result, during the air compression process, there will still be some moisture accumulated inside the system, and thus the operation effect of blowing back the desiccant is not obvious.

[0044] In this solution, the present invention proposes an innovative application scenario: using the ECU to intelligently control the corresponding functions of the vehicle according to the external humidity value of the vehicle, the internal humidity value of the air supply system, and the parameters related to noise. Specifically, the sensors outside the vehicle will collect humidity information and transmit it to the ECU. In one embodiment, when the sensors outside the vehicle convert the external humidity information into electrical signals and then transmit these signals to the ECU. In one embodiment, when the humidity sensor outside the vehicle detects a relatively high humidity level, it will transmit this information to the ECU.

[0045] During the implementation process, a series of judgment conditions and countermeasures for different humidity conditions are pre-stored inside the ECU. These preset values are obtained based on a large amount of experimental data and practical experience to ensure that the vehicle can maintain good performance in various humidity environments.

[0046] The ECU that receives the humidity information will make judgments and process them. First, the ECU will compare the measured humidity value with the preset threshold. If the measured humidity exceeds the preset threshold, the ECU will activate the corresponding countermeasures, such as starting the reverse exhaust of the active suspension air supply system mentioned below.

[0047] In addition, the ECU will also combine this humidity information with the data collected by other sensors to achieve more accurate judgments. For example, when the humidity is relatively high, the ECU may consider that the external environment of the vehicle is relatively harsh, and thus avoid starting the reverse exhaust function of the active suspension air supply system to avoid being affected by the humid environment.

[0048] Specifically, the method for controlling the drying ability of the active suspension air supply system further includes: determining that the external humidity value is greater than or equal to the preset first humidity threshold, and the ECU may not start the reverse exhaust function of the active suspension air supply system to avoid useless exhaust work.

[0049] When the external humidity obtained by the EUC meets the preset conditions, the ECU obtains the internal humidity value of the active suspension air supply system and determines whether exhaust is required. In one embodiment, the drying capacity control method of the active suspension air supply system further includes: determining that the internal humidity value is less than a preset second humidity threshold; not starting the backflush of the desiccant. When the internal humidity value is less than the preset second humidity threshold, it indicates that the desiccant dryer functions normally and no exhaust operation is required. The desiccant in the desiccant dryer is regenerated, and the second humidity threshold can be set according to system requirements.

[0050] When the ECU determines that the external humidity is less than the preset first humidity threshold and the internal humidity value is greater than or equal to the second humidity threshold, it indicates that the external environment meets the requirements for backflush, and the backflush effect will not be reduced. Moreover, it is time for the desiccant dryer to be backflushed to regenerate the desiccant. At this time, the ECU will control the air storage tank and the distribution valve to open, allowing the dry high-pressure gas to pass through the desiccant dryer, taking the moisture away from the desiccant dryer to the external atmosphere. During the subsequent active air replenishment process of the air compressor, since the humidity of the air decreases, the desiccant dryer will not absorb a large amount of water vapor again, affecting the regeneration effect of the desiccant. In addition, excessive backflush processes will also generate relatively large noise, affecting the riding experience of the occupants.

[0051] In the above technical solution of the present invention, by obtaining the external humidity value of the vehicle; determining that the external humidity value is less than the preset first humidity threshold; obtaining the internal humidity value of the air supply system; determining that the internal humidity value is greater than or equal to the preset second humidity threshold; and performing backflushing of the desiccant. If the humidity of the external air is too high, it will cause the desiccant to expel some water vapor during backflushing, but at the same time, it will also inhale some or more water vapor, thus weakening the backflushing effect of the desiccant and even producing a countereffect. The present invention detects the external humidity value and determines whether the external humidity value is less than the preset first humidity value, thereby excluding the situation where the backflushing effect is not ideal or even negative, and achieving the purpose of discharging the water vapor of the desiccant from the internal system by backflushing the desiccant.

[0052] In the second embodiment of the control method of the active suspension air supply system, refer to Figure 2 , the control method of the active suspension air supply system includes: The difference between this embodiment and the first embodiment is that after step S1, obtaining the external humidity value of the vehicle and step S2, determining that the external humidity value is less than the preset first humidity threshold, steps S3 and S5 are performed. Specifically: S3. Obtain the parameters related to noise.

[0053] S5. Determine that the parameters related to noise meet the preset conditions, and then execute the step of obtaining the internal humidity value of the air supply system.

[0054] S6. Obtain the internal humidity value of the air supply system.

[0055] S7. Determine that the internal humidity value is greater than or equal to a preset second humidity threshold.

[0056] S8. Perform backwashing on the desiccant.

[0057] The active suspension air supply system dries compressed air through a desiccant and backwashes the desiccant by exhausting. For example, the high-pressure gas in the air storage tank or the air spring assembly flows through the desiccant in a reverse path, thereby bringing the moisture in the desiccant to the atmosphere and realizing the regeneration of the drying capacity. However, when the desiccant is backwashed, the noise generated by the system is relatively large, which will affect the user's riding experience. When the desiccant is backwashed, the noise generated by the system is relatively large, which will affect the user's riding experience.

[0058] After determining that the external humidity value is less than the preset first humidity threshold; that is, the humidity outside the vehicle at this time is at least not higher than the humidity of the internal air storage tank. In this way, after backwashing the desiccant and restoring the desiccant, it will not cause more water vapor to enter the desiccant due to the air compressor's intake from the atmosphere, affecting the effect of backwashing the desiccant.

[0059] When the desiccant is backwashed, the noise generated by the system is relatively large, which will affect the user's riding experience. In order to improve the user experience when the system backwashes the desiccant.

[0060] S3. Obtain parameters related to noise.

[0061] S5. If it is determined that the parameters related to noise meet the preset conditions, then execute the step of obtaining the internal humidity value of the air supply system.

[0062] The parameters related to noise are parameters that directly or indirectly reflect the magnitude of vehicle noise. For example, it can be the vehicle noise decibel. The larger the vehicle noise decibel, the more directly it can reflect the greater the vehicle noise; for another example, it can also be parameters such as vehicle speed. The greater the vehicle speed, the greater the wind noise, tire noise, and engine noise generated by the vehicle, thereby indirectly reflecting the greater the vehicle noise.

[0063] Optionally, the parameters related to noise can be one or several of the vehicle noise decibel, motor speed, vehicle speed, and torque. The controller can be connected to sensors to obtain the external humidity of the vehicle and the parameters related to noise. For example, the external humidity of the atmosphere outside the vehicle can be obtained through a humidity sensor, and for another example, the parameters related to noise such as the vehicle noise decibel can be obtained through a noise sensor. The controller can also receive vehicle information data in real time through the CAN bus. The vehicle information data includes one or several of the parameters related to noise such as motor speed, vehicle speed, and torque.

[0064] Among them, the vehicle speed can be measured by a vehicle speed sensor or obtained by analyzing information sent from the vehicle instrument cluster, body controller, vehicle braking system, automatic transmission controller, GPS, etc. The parameter related to noise is a parameter that directly or indirectly reflects the magnitude of vehicle noise. For example, it can be the vehicle noise decibel. The larger the vehicle noise decibel, the greater the vehicle noise can be directly reflected. Another example is a parameter such as the vehicle speed. The greater the vehicle speed, the greater the wind noise, tire noise, and engine noise generated by the vehicle, thus indirectly reflecting that the vehicle noise is greater.

[0065] It should be noted that step S1 and step S3 can be carried out simultaneously, or step S3 can be carried out first and then step S1. For example, in the first method, obtain the parameter related to noise; determine that the parameter related to noise meets the preset condition. If so, then obtain the external humidity value of the vehicle; determine that the external humidity value is less than the preset first humidity threshold; if so, then obtain the internal humidity value of the air supply system; determine that the internal humidity value is greater than or equal to the preset second humidity threshold; perform backwashing of the desiccant.

[0066] The second method is to obtain the external humidity value of the vehicle; determine that the external humidity value is less than the preset first humidity threshold; if so, then determine whether the parameter related to noise meets the preset condition. If it is determined that the parameter related to noise meets the preset condition, then execute the step of obtaining the internal humidity value of the air supply system. If so, obtain the internal humidity value of the air supply system; determine that the internal humidity value is greater than or equal to the preset second humidity threshold; perform backwashing of the desiccant.

[0067] The third method is to obtain the external humidity value of the vehicle and the parameter related to noise simultaneously; determine that the external humidity value is less than the preset first humidity threshold and determine that the parameter related to noise meets the preset condition simultaneously. If both are satisfied, then execute the step of obtaining the internal humidity value of the air supply system. If both are satisfied, then obtain the internal humidity value of the air supply system; determine that the internal humidity value is greater than or equal to the preset second humidity threshold; perform backwashing of the desiccant.

[0068] In one embodiment, the preset value of the parameter related to noise, such as the size of the preset vehicle speed threshold, can be determined by first obtaining through testing the parameter related to noise, such as the vehicle speed, and measuring the different experience levels of users when the desiccant backwashing is turned on at different sizes.

[0069] In one embodiment, the method for controlling the drying capacity of the active suspension air supply system further includes: when it is determined that the parameter related to noise does not meet the preset condition, but the external humidity value is less than the preset first humidity threshold and it is determined that the internal humidity value is greater than or equal to the preset second humidity threshold, prompt the user through the display panel that the desiccant needs to be backflushed, and can prompt to turn on the music player, etc., to prompt to start backflushing the desiccant to reduce the moisture in the desiccant and improve the user experience when the system backflushes the desiccant.

[0070] In the above manner, if any one of the external humidity value, the parameter related to noise, and the internal humidity value of the vehicle does not meet the condition, the desiccant is not backflushed.

[0071] In one embodiment, the method for controlling the drying capacity of the active suspension air supply system further includes: determining that the external humidity value is greater than or equal to the preset first humidity threshold; not starting the backflushing of the desiccant. The first humidity threshold can be set according to system requirements.

[0072] In one embodiment, the method for controlling the drying capacity of the active suspension air supply system further includes: determining that the internal humidity value is less than the preset second humidity threshold; not starting the backflushing of the desiccant. The second humidity threshold can be set according to system requirements.

[0073] In one embodiment, the method for controlling the drying capacity of the active suspension air supply system further includes: if the parameter related to noise does not meet the preset condition, the backflushing of the desiccant is not started. The parameter related to noise can be referred to as described above.

[0074] In the above technical solution of the present invention, by obtaining the external humidity value of the vehicle; determining that the external humidity value is less than the preset first humidity threshold; obtaining the parameter related to noise; determining that the parameter related to noise meets the preset condition, obtaining the internal humidity value of the air supply system; determining that the internal humidity value is greater than or equal to the preset second humidity threshold; backflushing the desiccant. If the humidity of the external air is too high, it will cause the backflushing of the desiccant to discharge some water vapor, and then inhale some or more water vapor, so that the effect of backflushing the desiccant will be weakened or even have a negative effect. The present invention detects the external humidity value and judges whether the external humidity value is less than the preset first humidity value, thereby excluding the situation where the backflushing effect is not ideal or even has a negative effect, and realizing the purpose of backflushing the desiccant to discharge the water vapor of the desiccant from the internal system; on this basis, through the concept that the vehicle noise can cover the noise during the backflushing of the desiccant, using wind noise and road noise to cover the exhaust sound, reducing the influence of the backflushing process, and improving the user experience when the system backflushes the desiccant.

[0075] In the third embodiment of the control method of the active suspension air supply system, refer to Figure 3, The difference between this embodiment and the second embodiment is that after step S3, obtaining parameters related to noise, and before step S5, determining that the parameters related to noise meet the preset conditions and then performing the step of obtaining the internal humidity value of the air supply system, step S4 is executed to control the number of back blows according to step S4. Specifically: The control method of the active suspension air supply system includes: Step S4, obtaining parameters related to the environment outside the vehicle; The parameters related to the environment outside the vehicle at least include the temperature and time outside the vehicle. The parameters related to the environment outside the vehicle can be sent by the in-vehicle intelligent cockpit controller to obtain the location of the vehicle and relevant time and weather information. For example, the vehicle obtains relevant weather and time information of the area where it is located through the vehicle network.

[0076] Step S4 can be carried out synchronously with step S5. For example, when the vehicle is driving and the vehicle speed reaches the preset speed threshold, the ECU synchronously obtains the weather information at this time, such as the temperature in the area where the vehicle is driving and / or the time in this area at this time, so as to set a reasonable number of back blows according to the parameters related to the environment and ensure the back blow effect. For example, when the temperature is greater than the preset temperature value, back blow two or three times; when the temperature is lower than the preset temperature value, back blow once; or set ladder conditions according to the external temperature, such as back blow once when the obtained temperature value is at a certain preset temperature threshold; back blow two or three times when the obtained temperature value is at another preset temperature threshold. Another example is to set the number of back blows according to the time. For example, if the time is during the day (8:00 - 18:00), then back blow two or three times; if the time is at night (18:00 - 8:00, excluding integers), then back blow once to reduce noise.

[0077] Refer to Figure 4 , after step S4, obtaining the parameters related to the environment outside the vehicle, it further includes: Step S41, setting the number of back blows for back blowing the desiccant according to the parameters related to the environment; Step S42, the step of back blowing the desiccant is specifically: back blowing the desiccant according to the number of back blows.

[0078] In this embodiment, step 1 and step S3 are executed synchronously. That is, when obtaining the external humidity value, parameters related to noise are obtained synchronously. Then, steps S2 and S5 are executed synchronously, that is, it is judged whether the external humidity value and the parameters related to external noise meet the start conditions. If the external humidity value does not meet the start conditions, the external humidity is too high and the back-blowing effect is not ideal. If the parameters related to external noise do not meet the start conditions, even if the external humidity meets the conditions, the noise is large during the start-up process and the user experience is poor. That is, if either step 1 or step S3 does not meet the conditions, it will not start. If the conditions are met, the subsequent steps are executed. Since the relevant data of step S4 can be directly obtained on the vehicle, step S4 can be executed simultaneously with steps S1 and S3. It can also obtain the relevant data when judging S2 and S5, or after judging that S2 meets the conditions, execute step S4 and execute step S5 simultaneously.

[0079] In one embodiment, the parameters related to the environment at least include the temperature and time outside the vehicle. The temperature and time can be that the intelligent cockpit controller in the vehicle sends the location of the vehicle and the relevant time weather information, combines the signal of the external temperature sensor with the signals of time, address weather, etc. transmitted by the intelligent cockpit controller, and reasonably increases the number of back-blowing times during the high temperature in the daytime and reduces the number of back-blowing times during the low temperature at night.

[0080] This solution can also be combined with the solution in the first embodiment; or combined with the solution in the second embodiment. Taking the application of this solution in the solution of the second embodiment as an example, when the external environment is daytime, the number of back-blowing times is set according to the external temperature to reduce the moisture in the desiccant, and at the same time, prevent excessive back-blowing from reducing the service life of the air compressor. Reducing the noise during the back-blowing process of the vehicle can be: during the whole vehicle driving process, the vehicle speed is detected. When the vehicle speed is greater than the preset vehicle speed threshold, such as 40 km / h, the external humidity value is obtained. After the external humidity value is less than the first humidity threshold, the controller reads the internal humidity value. When the internal humidity value is greater than the preset first humidity threshold, the air compressor works or the air storage tank exhausts air to back-blow the dryer. The number of back-blowing times can be, for example, 5 times during the day, and the interval between each time is 2h / 3h, etc. After the number of back-blowing times is completed, it needs to be separated by a period of time before it can be restarted to prevent excessive back-blowing from reducing the service life of the air compressor.

[0081] This excludes the behavior of back-blowing the desiccant multiple times or frequently in a short time, avoiding affecting the user's driving experience.

[0082] Refer to Figure 5 , in one embodiment, the step of back-blowing the desiccant further includes: S43. If the number of times of back-blowing the desiccant is less than the number of back-blowing times, obtain the internal air pressure of the air storage tank; S44. If the internal air pressure of the air storage tank is less than the preset air pressure; S45. Start the air compressor to replenish the internal air pressure to be greater than or equal to the preset air pressure. If the vehicle body height is adaptively adjusted downward, the airbag exhausts to the outside of the system. During this process, the air compressor will pump air to detect whether the internal humidity value is greater than or equal to the second humidity threshold. If it is greater than or equal to, continue to backflush the desiccant. During this process, different second humidity thresholds require different air pressures in the air storage tank. For example, for 50% humidity, 12 Mpa - 13 Mpa is required; for 60% humidity, 14 Mpa is required. The relationship between humidity and air pressure is approximately that for every 10% increase in humidity, 1 Mpa of air pressure is increased. Therefore, to ensure the backflushing effect, after each backflushing is completed, read the internal humidity according to the controller and obtain the air pressure value inside the air storage tank. If it is less than the preset air pressure threshold, start the air compressor to replenish the internal air pressure to be greater than or equal to the preset air pressure.

[0083] In one embodiment, the time for backflushing the desiccant is a fixed time, such as 1 s, 1.5 s, 2 s, 2.2 s, etc.

[0084] In the above technical solution of the present invention, by obtaining the external humidity value of the vehicle; determining that the external humidity value is less than the preset first humidity threshold; obtaining the parameter related to noise; determining that the parameter related to noise meets the preset condition, obtaining the internal humidity value of the air supply system; determining that the internal humidity value is greater than or equal to the preset second humidity threshold; and performing backflushing of the desiccant. If the humidity of the external air is too high, it will cause the backflushed desiccant to discharge some water vapor and then inhale some or more water vapor, thus weakening the backflushing effect of the desiccant or even producing a reverse effect. The present invention detects the external humidity value and judges whether the external humidity value is less than the preset first humidity value, thereby eliminating the situation where the backflushing effect is not ideal or even negative, and achieving the purpose of discharging the water vapor of the desiccant from the internal system; on this basis, through the concept that the vehicle noise can cover the noise during the backflushing of the desiccant, using wind noise and road noise to cover the exhaust sound, reducing the influence during the backflushing process, and improving the user experience when the system backflushes the desiccant. On this basis, according to the signal of the external temperature sensor of the vehicle, combining with the signals such as time, address, and weather transmitted by the intelligent cockpit controller, reasonably increase the number of backflushing times during the day at high temperature and reduce the number of times at night at low temperature to prevent excessive backflushing from reducing the service life of the air compressor.

[0085] Further, in the fourth embodiment of the control method of the active suspension air supply system, refer to Figure 5 and Figure 6 , the control method of the active suspension air supply system includes: The step of performing backflushing of the desiccant further includes: S46. If the number of times of backwashing the desiccant is greater than the backwashing times and the internal humidity value is greater than or equal to the preset second humidity threshold, a warning is given.

[0086] This solution can be used in combination with the first embodiment, the second embodiment, and the third embodiment.

[0087] Specifically, in one embodiment, if the number of backwashing times determined according to temperature and time is 5 times, and the fixed backwashing time for each time is 1 s; after each backwashing ends, the air compressor performs a gas replenishment operation. During this process, the humidity sensor inside the air supply system will obtain the internal humidity value. If the internal humidity value is greater than the second humidity threshold, the backwashing process is restarted after a period of time, such as 1 h; if after the 5 backwashing times end, the humidity sensor will obtain the internal humidity value at the last time, and if the internal humidity value is greater than the second humidity threshold, a warning is given. This warning behavior can be to prompt the user to replace the desiccant through a display panel, etc.

[0088] , In the subsequent description, the use of suffixes such as "module", "component", or "unit" for representing elements is only for the convenience of the description of the present invention, and it has no specific meaning itself. Therefore, "module", "component", or "unit" can be used interchangeably.

[0089] It should be noted that in this article, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including that element.

[0090] The above serial numbers of the embodiments of the present invention are only for description and do not represent the advantages and disadvantages of the embodiments.

[0091] Refer to Figure 7, the present invention also provides an active suspension air supply system, which includes an external humidity sensor, an air storage tank, a dryer, an air compressor, a distribution valve, an internal humidity sensor, and a controller. The external humidity sensor is used to detect the air humidity outside the vehicle; the air storage tank is used to store compressed air; the dryer contains a desiccant; the air compressor is connected to the dryer; the distribution valve is respectively connected to the dryer and the air storage tank; the internal humidity sensor is arranged between the dryer and the distribution valve, or between the distribution valve and the air storage tank, and the in-vehicle humidity sensor is used to detect the air humidity after passing through the desiccant; when the controller executes, it realizes the control method of the above-mentioned active suspension air supply system.

[0092] Combined with Figure 6 , in one embodiment, a drying program of the active suspension air supply system is stored on the controller and can run on the controller. When the drying program of the active suspension air supply system is executed by the controller, it realizes the steps of the control method of the above-mentioned active suspension air supply system. The specific steps of the control method of the active suspension air supply system refer to the above-mentioned embodiment. Since the present active suspension air supply system adopts all the technical solutions of the above-mentioned all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one.

[0093] In one embodiment, a memory is further included. A drying program of the active suspension air supply system is stored on the memory and can run on the controller. When the drying program of the active suspension air supply system is executed by the controller, it realizes the steps of the control method of the above-mentioned active suspension air supply system. The specific steps of the control method of the active suspension air supply system refer to the above-mentioned embodiment.

[0094] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disc), and includes several instructions to enable a terminal device (which can be a fixed terminal, such as an Internet of Things intelligent device, or a mobile terminal, including many networked devices such as autonomous driving vehicles) to execute the methods described in various embodiments of the present invention.

[0095] Specifically, the present invention further provides a computer-readable storage medium, on which a drying program based on the active suspension air supply system is stored. When the drying program of the active suspension air supply system is executed by a controller, the steps of the control method of the active suspension air supply system as described above are implemented. For the specific steps of the control method of the active suspension air supply system, reference may be made to the above embodiments. Since this computer-readable storage medium adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one.

[0096] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A control method for an active suspension air supply system, characterized in that Including: Obtain the external humidity value of the vehicle; Determine that the external humidity value is less than a preset first humidity threshold; Obtain the internal humidity value of the air supply system; Determine that the internal humidity value is greater than or equal to a preset second humidity threshold; Perform backflushing of the desiccant.

2. The control method of the active suspension air supply system according to claim 1, characterized in that After determining that the external humidity value is less than the preset first humidity threshold and before obtaining the internal humidity value of the air supply system, it further includes: Obtain parameters related to noise; Determine that the parameters related to noise meet the preset conditions, and then execute the step of obtaining the internal humidity value of the air supply system.

3. The control method of the active suspension air supply system according to claim 2, characterized in that, The parameters related to noise are one or several of vehicle noise decibels, motor speed, vehicle speed, and torque.

4. The control method of the active suspension air supply system according to claim 1, characterized in that, After determining that the external humidity value is less than the preset first humidity threshold and before obtaining the internal humidity value of the air supply system, it further includes: Obtain parameters related to the environment outside the vehicle; Set the number of backflushes of the desiccant according to the parameters related to the environment; The step of performing backflushing of the desiccant is specifically: perform backflushing of the desiccant according to the number of backflushes.

5. The control method of the active suspension air supply system according to claim 4, characterized in that, The parameters related to the environment at least include the temperature and time outside the vehicle.

6. The control method of the active suspension air supply system according to claim 4, characterized in that, The step of performing backflushing of the desiccant further includes: If the number of times of backflushing the desiccant is less than the number of backflushes, obtain the internal air pressure of the air storage tank; If the internal air pressure of the air storage tank is less than the preset air pressure threshold; Start the air compressor and supplement the internal air pressure to be greater than or equal to the preset air pressure.

7. The control method of the active suspension air supply system according to claim 4, characterized in that The step of performing backflushing of the desiccant further includes: If the number of times of backflushing the desiccant is less than the number of backflushes, then after each backflush stops, start the air compressor to draw air and execute the step of obtaining the internal humidity value of the air supply system.

8. The control method of the active suspension air supply system according to claim 4, characterized in that, The step of performing backflushing of the desiccant further includes: If the number of times of backflushing the desiccant is greater than the number of backflushes and the internal humidity value is greater than or equal to the preset second humidity threshold; Then give an alarm.

9. An active suspension air supply system, characterized in that, Including: An external humidity sensor for detecting the air humidity outside the vehicle; An air storage tank for storing compressed air; A dryer with desiccant therein; A distribution valve connected to the dryer and the air storage tank respectively; An air compressor connected to the dryer; An internal humidity sensor provided between the dryer and the distribution valve or between the distribution valve and the air storage tank, and the in-vehicle humidity sensor is used to detect the air humidity after passing through the desiccant; And A controller, which when executed realizes the control method of the active suspension air supply system as described in any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that, A drying program based on the active suspension air supply system is stored thereon, and when the drying program of the active suspension air supply system is executed by the controller, it realizes the control method of the active suspension air supply system as described in any one of claims 1 to 8.

Images