Threshold assembly for automobile

Abstract

The invention relates to a doorsill assembly for an automobile, which comprises a doorsill body and is characterized in that an independent gas storage cavity for storing gas is arranged on the doorsill body, and the gas storage cavity is communicated with an air suspension system. The doorsill has the advantages that the independent air storage cavity used for storing air is formed in the doorsill body and communicates with the air suspension system, so that a traditional air storage tank independently arranged through a mounting support is replaced, and the air suspension function is greatly improved while the original air suspension function is not affected. The assembly efficiency and the space utilization rate of the automobile are improved, and the weight of the whole automobile body is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, and in particular to a door sill assembly assembled on an automobile. Background Art

[0002] The air suspension system can automatically adjust the height of the vehicle body according to road conditions, thereby improving the stability and comfort of the vehicle. For example, the specific structure can refer to the air suspension system provided in the Japanese patent application "Air Suspension Device" with application number JP2021143302, which includes an air tank and an air spring. The air tank can realize the lifting function of the air suspension system by inflating or deflating the air spring. Commonly used air tanks can refer to the air tank provided in the Chinese invention application "A Gas Tank, Air Suspension System and Vehicle" with application number CN202411106064.X (publication number CN118935226A).

[0003] The air spring in the prior art is arranged between the vehicle body and the wheel. The door sill on the vehicle body is located between the front and rear wheels and is adjacent to the front and rear wheels at the same time. The gas tank is an independent component with a certain volume to meet the demand for storing gas. This leads to the following limitations of the gas tank in actual use: first, since the gas tank is an independent component, it needs to be additionally installed in the vehicle body through a mounting bracket, which not only reduces the assembly efficiency of the vehicle, but also increases the overall weight of the vehicle body; second, since the gas tank has a certain volume, installing an independent gas tank will also reduce the space utilization of the vehicle. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a door sill assembly capable of improving automobile assembly efficiency and space utilization in view of the above-mentioned existing technical status.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: the threshold assembly for a car includes a threshold body, which is characterized in that an independent gas storage cavity for storing gas is provided on the threshold body, and the gas storage cavity is connected to the air suspension system.

[0006] In order to ensure the sealing of the air storage chamber, preferably, the threshold body is provided with a sub-chamber that is independently closed into a tubular shape, and sealing covers are respectively provided along the two ends of the sub-chamber, and each of the sealing covers and the sub-chamber together surround the air storage chamber. Such a design is made in consideration of the fact that the threshold body is usually long, so in order to make the air storage chamber have a sufficient volume, a tubular sub-chamber will inevitably be formed, and by providing sealing covers at the two ends of the sub-chamber, a chamber with sufficient sealing can be formed, so that the threshold body not only has the function of constituting the automobile body, but also can be used as an air storage chamber, achieving the effect of "one thing for two purposes", and on the other hand, the two sealing covers can also play a role in strengthening the structural strength of the threshold body.

[0007] In order to achieve the connection between the air storage chamber and the air suspension system, preferably, the air storage chamber is also provided with a first joint for connecting with the air suspension system and for air intake or air exhaust, or a second joint integrated with air intake and air exhaust, and the first joint or the second joint can be selectively adapted to the corresponding sealing cover. During use, the air storage chamber also needs to be connected with the air suspension system to be able to intake and exhaust air to the air suspension system. According to actual needs, two independent first joints can be provided on the air storage chamber, which are used for air intake and air exhaust respectively, or only one second joint that can be used for both inflation and deflation. If two independent first joints are provided, the two can be provided on the same sealing cover or on different sealing covers.

[0008] In order to simplify the connection structure between the air storage chamber and the air suspension system, preferably, the sealing cover is provided with the second joint, the second joint includes a first connection channel and a second connection channel connected to the air source fluid of the air suspension system, and the first connection channel or the second connection channel is provided with a one-way valve capable of controlling one-way air inlet or outlet. Compared with the above-mentioned two independent first joints, the solution of only providing a second joint capable of both inflation and deflation is simpler in layout on the one hand, and on the other hand, sometimes the surface area of ​​the sealing cover is small, and the solution of only providing a second joint can occupy a smaller area and space.

[0009] In order to improve the strength of the threshold body, preferably, a cavity is left inside the threshold body, and a partition is also arranged in the cavity, and together with at least a part of the peripheral wall surrounding the cavity, the partition forms the sub-cavity. Since the partition and the peripheral wall surrounding the cavity form the sub-cavity together, the partition can also play the role of "reinforcement rib", so that the partition not only strengthens the strength of the threshold body itself, but also strengthens the structural strength of the air storage cavity, thereby improving the safety of the air storage cavity.

[0010] Furthermore, in order to realize that the partition can separate the threshold body, preferably, the partition is in the shape of a plate and abuts against the peripheral wall of the cavity to divide the cavity into at least two sub-chambers distributed vertically and / or horizontally, and the sub-chamber located in the center of each sub-chamber and surrounded by a closed tubular wall constitutes the air storage chamber. In order to install the threshold body on the vehicle body, the peripheral sub-chamber is often provided with processing features such as through holes and openings for connection with other parts, and the sealing is relatively difficult to ensure. However, setting the air storage chamber in the sub-chamber located in the center and surrounded by a closed tubular wall is conducive to ensuring the sealing.

[0011] In order to avoid excessive pressure inside the air storage chamber, preferably, the second joint is provided on the sealing cover at one end of the air storage chamber, and correspondingly, a safety valve for adjusting the internal pressure of the air storage chamber is provided on the sealing cover at the other end. The safety valve can be a breathing valve or a pressure relief valve, etc., and its function is that when the internal pressure of the air storage chamber is too high due to the air discharge of the air suspension system or other abnormal conditions, the safety valve can automatically open and release the pressure to ensure the safety of the air storage chamber and surrounding parts. The second joint and the safety valve are provided on two different sealing covers because the threshold body is divided into at least two sub-chambers by a plate-shaped partition, so that the cross-sectional area of ​​a single sub-chamber is small and insufficient to simultaneously provide the second joint and the safety valve.

[0012] In order to improve the strength of the air storage cavity and the threshold body, preferably, any one of the chambers located outside the sub-cavity has four side walls, including an outer side wall directly using a portion of the peripheral wall of the threshold body, an inner side wall directly using the side wall corresponding to the air storage cavity, and a first side wall and a second side wall connected to the outer side wall and the inner side wall, and the first side wall and / or the second side wall are provided with reinforcing ribs to assist in strengthening the strength of the outer side wall. Such a design is based on the consideration that in order to ensure the strength of the air storage cavity and the threshold body, the outer side wall usually needs to be thicker, and through the reinforcing ribs, the thickness of the outer side wall can be reduced while ensuring the strength of the air storage cavity and the threshold body.

[0013] In order to ensure that the reinforcing rib can reduce the thickness of the outer side wall while ensuring the strength of the air storage cavity and the threshold body, preferably, the reinforcing rib includes an end portion sharing a common end with the corresponding first side wall or second side wall and a terminal end arranged in a bifurcated manner with the common end, and the terminal end is connected to the outer side wall. The reinforcing rib is connected to the first side wall or the second side wall through the common end, and at the same time, the terminal end is connected to the outer side wall to support the outer side wall, thereby improving the strength of the air storage cavity and the threshold body.

[0014] The "fluid connection" referred to in the present invention refers to the spatial position relationship between two parts or parts (hereinafter collectively referred to as the first part and the second part respectively), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, duct, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

[0015] Compared with the prior art, the advantages of the present invention are as follows: an independent gas storage chamber for storing gas is provided on the door sill body, and the gas storage chamber is connected with the air suspension system, thereby replacing the traditional gas storage tank independently arranged by means of an installation bracket, and at the same time without affecting the function of the original air suspension, the assembly efficiency and space utilization of the automobile are improved, and the overall weight of the vehicle body is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a door sill assembly in Embodiment 1 of the present invention;

[0017] Figure 2 This is a schematic structural diagram of the door sill assembly from another angle in Embodiment 1 of the present invention;

[0018] Figure 3 is a schematic cross-sectional structure diagram of a door sill assembly in Embodiment 1 of the present invention;

[0019] Figure 4 It is a schematic diagram of the exploded structure of the door sill assembly in Embodiment 1 of the present invention;

[0020] Figure 5 This is a schematic diagram of the structure of the door sill body in Embodiment 1 of the present invention;

[0021] Figure 6 This is a schematic structural diagram of a door sill body, a first sealing cover and a second joint in Embodiment 1 of the present invention;

[0022] Figure 7 is a schematic structural diagram of a door sill assembly in Embodiment 2 of the present invention;

[0023] Figure 8 is a schematic structural diagram of a door sill assembly in Embodiment 3 of the present invention;

[0024] Fig. 9 Schematic diagram of the structure of the door sill assembly in embodiment 4 of the present invention. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with specific embodiments.

[0026] Example 1

[0027] like Figures 1 to 6 FIG. 1 is a preferred embodiment of the present invention. Figures 1-2 The threshold assembly for a vehicle in this embodiment includes a threshold body 1, on which an independent gas storage chamber 2 for storing gas is provided, and the gas storage chamber 2 is connected to the air suspension system. Figures 3-4 As shown, the threshold body 1 is provided with a sub-chamber 11 which is independently closed into a tubular shape, and sealing covers are respectively provided along the two ends of the sub-chamber 11. Each sealing cover and the sub-chamber 11 together surround the gas storage chamber 2. The two sealing covers may be named as the first sealing cover 12 and the second sealing cover 13. Such a design is made in consideration of the fact that the threshold body 1 is usually long. Therefore, in order to make the gas storage chamber 2 have a sufficient volume, a tubular sub-chamber 11 will inevitably be formed. The first sealing cover 12 and the second sealing cover 13 are respectively provided at the two ends of the sub-chamber 11 to ensure the sealing of the gas storage chamber 2. On the other hand, the first sealing cover 12 and the second sealing cover 13 can also play a role in strengthening the structural strength of the threshold body 1.

[0028] Considering that the air storage chamber 2 needs to be connected to the air suspension system, a second connector 21 for connecting to the air suspension system and integrating air inlet and outlet is also provided in the structure of the air storage chamber 2, and the second connector 21 is adapted on the first sealing cover 12. The second connector 21 includes a first connecting channel and a second connecting channel connected to the air source fluid of the air suspension system, and a one-way valve capable of controlling one-way air inlet or air outlet is provided on the first connecting channel or the second connecting channel. The solution of only providing a second connector 21 capable of both inflation and deflation is simpler in layout on the one hand, and on the other hand, sometimes the surface area of ​​the first sealing cover 12 is small, and the solution of only providing a second connector 21 can occupy a smaller area and space.

[0029] Considering that the door sill body 1 also needs to have sufficient strength, such as Figures 5-6As shown, a cavity 10 is left inside the threshold body 1, and a partition 101 is also arranged in the cavity 10, and together with at least part of the peripheral wall surrounding the cavity 10, a sub-chamber 11 is formed. The partition 101 and the peripheral wall surrounding the cavity 10 together form the sub-chamber 11, and the partition 101 can also play the role of a "reinforcement rib", so that the partition 101 not only strengthens the strength of the threshold body 1 itself, but also strengthens the structural strength of the air storage chamber 2, thereby improving the safety of the air storage chamber 2. The partition 101 is plate-shaped and abuts against the peripheral wall of the cavity 10 to divide the cavity 10 into at least two sub-chambers 11 distributed up and down and left and right. The cavity 10 in this embodiment is divided into ten sub-chambers 11, and the layout is similar to a "nine-square grid". The sub-chamber 11 located in the center of each sub-chamber 11 and surrounded by a closed tubular wall constitutes the air storage chamber 2. The reason why the gas storage chamber 2 is formed by the sub-chamber 11 located in the center and surrounded by the wall to form a closed tubular shape is that in order to install the threshold body 1 on the vehicle body, the peripheral sub-chamber 11 is often provided with processing features such as through holes and openings for connecting with other parts, and the sealing is relatively difficult to ensure. However, the gas storage chamber 2 is arranged in the sub-chamber 11 located in the center and surrounded by the wall to form a closed tubular shape, which is conducive to ensuring the sealing. Since the threshold body 1 and the first sealing cover 11 and the second sealing cover 12 are usually difficult to be integrally processed and formed, welding connection is often used. In order to ensure the welding quality between the first sealing cover 12 and the second sealing cover 13 and the partition 101 and further improve the sealing, the edges where the first sealing cover 12 and the second sealing cover 13 contact the partition 101 are also chamfered, so that a welding groove is reserved at the connection between the two to ensure the welding quality.

[0030] Finally, regarding the safety of the air storage chamber 2 when in use, in order to avoid excessive pressure inside the air storage chamber 2, a safety valve 22 for adjusting the internal pressure of the air storage chamber 2 is provided on the second sealing cover 13 of the air storage chamber 2. Its function is that when the internal pressure of the air storage chamber 2 is too high due to the air discharge of the air suspension system or other abnormal conditions, the safety valve 22 can open and release the pressure automatically to ensure the safety of the air storage chamber 2 and surrounding parts. In addition, since the cavity 10 of the sill body 1 is divided by the partition 101, the cross-sectional area of ​​a single sub-chamber 11 is relatively small, and it is difficult to set the second joint 21 and the safety valve 22 on the first sealing cover 12 or the second sealing cover 13 at the same time.

[0031] Furthermore, in order to better ensure the safety of the gas storage chamber 2 when in use, a pressure sensor and a gas concentration sensor are arranged, and the above sensor arrangements are connected to the intelligent control system through a dedicated sensor bus.

[0032] Regarding the arrangement of pressure sensors, a plurality of high-precision pressure sensors are evenly distributed inside the air storage chamber 2 , and the sensors are installed along the length and circumference of the air storage chamber 2 to ensure that the pressure changes at different positions in the air storage chamber 2 can be fully monitored.

[0033] Regarding the arrangement of the gas concentration sensor, a high-sensitivity gas concentration sensor is arranged in the inner cavity 10 of the rocker body 1 and near the sealing portion in contact with the external environment.

[0034] After the intelligent control system receives the data from the pressure sensor and gas concentration sensor, the specific operation process is as follows:

[0035] Step S100, performing preliminary processing using a sliding window averaging method.

[0036] Specifically, the sliding window average method is a data processing technology used to smooth time series data, reduce noise and short-term fluctuations in the data, and thus present the trends and characteristics of the data more clearly. Its core principle is to define a "window" of fixed length (i.e., window size) on the data sequence, and then calculate the average value of the data in the window in turn as the smoothed value of the data at the center of the window. By continuously moving this window, the entire data sequence is processed to obtain a series of smoothed values.

[0037] The intelligent control system obtains raw data from multiple high-precision pressure sensors arranged inside the gas storage chamber 2 and high-sensitivity gas concentration sensors in the cavity 10 and near the sealing part of the door sill body 1 through a dedicated sensor bus. For example, the pressure sensor measures the pressure values ​​at different positions in the gas storage chamber 2 at a certain sampling frequency (such as collecting data once every 0.1 seconds), and the gas concentration sensor also monitors the concentration data of a specific gas at a set frequency (such as once every 1 second). These raw data are transmitted to the intelligent control system in real time.

[0038] The processing process of the sliding window averaging method is as follows: Assume that we set the sliding window size to 5 data points. Taking the pressure sensor data processing as an example, when the intelligent control system receives a series of data sequences from the pressure sensor: P1 = 5.0MPa, P2 = 5.2MPa, P3 = 4.9MPa, P4 = 5.1MPa, P5 = 4.8MPa, P6 = 5.3MPa. For the data point P3, the corresponding data in the sliding window is P1-P5, and the average value of the data in the window is calculated: (5.0+5.2+4.9+5.1+4.8) / 5 = 5.0MPa. This 5.0MPa is the pressure value at the P3 position after the sliding window averaging method is processed.

[0039] Then the window is moved one position to the right to process the P4 data point. At this time, the data in the window is P2-P6, and the average value is calculated: (5.2+4.9+5.1+4.8+5.3) / 5=5.06MPa, which is the pressure value after processing at the P4 position. Similarly, the entire pressure sensor data sequence is processed to obtain a series of smoothed pressure values. For gas concentration sensor data, the processing method is the same. For example, the original data sequence of gas concentration: C1=10ppm, C2=12ppm, C3=9ppm, C4=11ppm, C5=8ppm... If the window size is still 5, when processing the C3 data point, the average gas concentration in the window is calculated: (10+12+9+11+8) / 5=10ppm, which is the gas concentration value of C3 after processing by the sliding window averaging method. Subsequently, the window is moved in sequence to process the entire gas concentration data sequence, thereby preliminarily smoothing the data fluctuations caused by sensor noise or instantaneous interference, improving the stability of the data, and laying the foundation for subsequent data processing and analysis.

[0040] Step S200, using the Kalman filter algorithm to further optimize the data processed by the sliding window averaging method. The Kalman filter algorithm makes an optimal estimate of the state variables of pressure and gas concentration based on the state equation and measurement equation of the system.

[0041] Among them, Kalman filtering is a recursive algorithm that optimally estimates the state of a system based on the linear system state equation and measurement equation. It can effectively estimate the state variables of the system in the presence of noise and uncertainty by integrating the prior knowledge of the system (prediction based on the state equation) and real-time measurement data. In this application scenario, it is used to further optimize the pressure and gas concentration data processed by the sliding window averaging method to obtain more accurate state variable estimates of pressure and gas concentration. The core is to continuously predict the state at the current moment based on the state estimate at the previous moment, and combine the measurement value at the current moment to obtain a better state estimate at the current moment by weighted averaging. The weight is determined based on the covariance matrix of the system and measurement noise, and can automatically adapt to the reliability of measurement under different working conditions.

[0042] Step S300: Based on the state variables of pressure and gas concentration obtained by optimal estimation, a dynamic mathematical analysis model is used to analyze and obtain the evaluation results of the pressure change rate and the gas leakage rate.

[0043] Among them, the dynamic mathematical analysis model is a mathematical model that integrates multivariable relationships. It aims to accurately evaluate the working state changes of the gas storage chamber, including key parameters such as the pressure change rate and the gas leakage rate, by analyzing state variables such as pressure and gas concentration. The model is constructed based on a large amount of experimental data, theoretical physical principles, and statistical analysis of actual vehicle operation data. It can consider the impact of multiple factors on the gas storage chamber 2 system, such as the physical properties of the gas (such as compressibility, diffusivity, etc.), the geometric structure of the gas storage chamber 2 (volume, shape, etc.), the operating conditions of the vehicle (speed, acceleration, driving road conditions, etc.) and environmental factors (temperature, altitude, etc.), so as to accurately quantify and predict the dynamic changes in the pressure inside the gas storage chamber 2 and possible gas leakage.

[0044] The dynamic mathematical analysis model is constructed by combining physical principles and data-driven methods. From the perspective of physical principles, based on the continuity equation and momentum equation in fluid mechanics, the conservation of mass and momentum of the gas in the gas storage chamber 2 during flow and leakage is considered to construct a basic framework for describing the changes in gas pressure and flow rate. At the same time, combined with the principles of heat transfer, the influence of heat exchange between the gas and the wall of the gas storage chamber 2 and the environment on the gas state is considered.

[0045] In terms of data-driven, a large amount of historical experimental data and actual vehicle operation data are used, and machine learning algorithms (such as multivariate linear regression, neural network, etc.) are used to fit and optimize some parameters in the model that are difficult to accurately calculate theoretically. For example, for some complex resistance coefficients in the gas leakage process, the heat transfer coefficient of the wall of the gas storage chamber 2, etc., the empirical relationship between them and various input variables is determined by regression analysis or neural network training of actual data under different working conditions, so that the model can more accurately reflect the behavior of the actual system.

[0046] Step S400, input the evaluation results of the pressure change rate and the gas leakage rate into the safety valve 22 pre-adjustment opening analysis model, output the safety valve 22 pre-adjustment opening value, and adjust the safety valve 22 opening according to the obtained safety valve 22 pre-adjustment opening value.

[0047] Among them, the safety valve 22 pre-adjustment opening analysis model is a model that performs calculations and decisions based on multiple input parameters. Its core purpose is to accurately determine the pre-adjustment opening value of the safety valve 22 based on the evaluation results of the pressure change rate and the gas leakage rate. The model comprehensively considers the safety operation requirements of the gas storage chamber 2, the current operating status of the vehicle, and the effect of the safety valve 22 on the pressure control of the gas storage chamber 2 under different openings. By establishing mathematical relationships and logical rules, the opening of the safety valve 22 is intelligently controlled to ensure that the gas storage chamber 2 can be maintained within a safe pressure range under various working conditions, while avoiding unnecessary gas emissions and energy waste.

[0048] The model first makes a preliminary judgment on the danger level of the gas storage chamber 2 based on the preset pressure change rate and gas leakage rate threshold. Assume that the pressure change rate threshold is set to: when the pressure change rate is greater than +0.1MPa / s or less than -0.05MPa / s (positive means the pressure rises too fast, negative means the pressure drops too fast), and the gas leakage rate threshold is set to when the gas leakage rate is greater than 0.15L / min, the gas storage chamber 2 is considered to be in a relatively dangerous state.

[0049] If the pressure change rate is +0.12MPa / s and the gas leakage rate is 0.2L / min, which exceeds the above threshold, the model enters the corresponding calculation branch. For example, the model uses the following calculation formula to calculate the pre-adjustment opening value of the safety valve 22: is a coefficient determined based on a large number of experiments and vehicle characteristics). Assuming a=5, b=10, c=3, then O=0.6+2+3=5.6%. The opening value calculated here is only an example, and the actual coefficient and calculation will be more complicated and accurately calibrated). This opening value indicates that the safety valve 22 should be opened to an opening of about 5.6% to release a certain amount of gas to alleviate the pressure rise and leakage of the gas storage chamber 2.

[0050] Output and control execution: The model outputs the final determined pre-adjusted opening value of the safety valve 22 to the control module of the safety valve 22. Based on this value, the control module of the safety valve 22 accurately adjusts the opening of the safety valve 22 through a high-precision electric actuator. For example, the electric actuator drives the motor to rotate the corresponding angle and number of steps according to the received opening value signal, driving the valve core of the safety valve 22 to move to the specified opening position, thereby controlling the gas discharge of the air storage chamber 2, so that the pressure of the air storage chamber 2 is maintained within a safe and appropriate range, ensuring the safety of vehicle operation and taking into account energy utilization efficiency and the normal operation of the air suspension system.

[0051] Furthermore, considering that the applied safety valve 22 pre-adjustment opening analysis model will be affected by external parameters, it is necessary to establish a quantitative adjustment method for external parameters to adjust the dynamic mathematical analysis model, so as to ensure that the applied safety valve 22 pre-adjustment opening analysis model is reasonable and accurate. For details, please refer to the following implementation method.

[0052] The evaluation results of the pressure change rate and the gas leakage rate are input into the safety valve 22 pre-adjustment opening analysis model, and the output safety valve 22 pre-adjustment opening value includes:

[0053] Step S410, obtaining the altitude data, climate type, and road type of the vehicle's current location in real time.

[0054] Specifically, altitude data refers to the vertical height information of the vehicle's position relative to the sea level. This data is of key significance for analyzing the changes in the physical properties of the gas and the pressure relationship between the inside and outside of the gas storage chamber 2. As the altitude increases, the atmospheric pressure decreases, and the physical properties of the gas, such as density and volume, will change accordingly, thereby affecting the change law of the internal pressure of the gas storage chamber 2 and the working performance of the safety valve 22. For example, in high-altitude areas, the mass of the same volume of gas will decrease, and the threshold and rate of pressure change may need to be re-evaluated to ensure that the safety valve 22 can be accurately pre-adjusted at the right time. The altitude data is obtained as follows: through the interaction of the global positioning system (GPS) and the geographic information system (GIS) data integrated in the vehicle navigation system or intelligent control system. GPS satellite positioning can determine the longitude and latitude coordinates of the vehicle, and then accurately determine the altitude of the current position of the vehicle with the help of the terrain altitude information stored in the GIS database. For example, when the vehicle is driving in a mountainous area, the GPS locates the specific longitude and latitude coordinates of the vehicle in a certain mountainous area, and the GIS system matches the corresponding altitude data according to the coordinates, such as displaying that the current altitude of the vehicle is 1500 meters. The accuracy of data acquisition can reach ±10 meters, which can meet the needs of adjusting the pre-adjustment opening analysis model of the safety valve 22.

[0055] Climate type: reflects the long-term weather characteristics of the area where the vehicle is located, including comprehensive information such as temperature, humidity, air pressure change trends, precipitation conditions, etc. Different climate types will have various effects on the air storage chamber 2 and related components. For example, a high temperature environment may cause the gas to expand more rapidly, causing the pressure in the air storage chamber 2 to rise faster; a high humidity environment may affect the accuracy of the sensor, and at the same time, moisture may react with the gas in the air storage chamber 2 or corrode the components, indirectly affecting the pressure change and the normal operation of the safety valve 22; in cold climates, the gas may shrink, and the material properties of some components may change, such as reduced elasticity, increased brittleness, etc. These factors need to be considered in the analysis of the pre-adjustment opening of the safety valve 22. The climate type is obtained as follows:

[0056] The vehicle can be equipped with an on-board meteorological sensor to directly measure the temperature, humidity, air pressure and other meteorological parameters at the current location, and then determine the climate type based on these parameters and the preset climate type classification rules. For example, if the temperature is measured to be above 35°C, the humidity is between 60%-90%, and the air pressure is relatively stable, combined with long-term meteorological data statistical analysis, it can be determined that the vehicle is in a high temperature and high humidity climate type. In addition, the vehicle can also establish a data connection with the local meteorological service agency or the Internet meteorological data platform to obtain more comprehensive and detailed climate type information, including the recent precipitation probability, wind direction and speed, etc., so as to more accurately evaluate the impact of climate on the air storage cavity 2 system.

[0057] Road type: indicates the road conditions on which the vehicle is traveling, such as expressways, urban roads, rural roads, off-road roads, etc. Different road types will bring different driving conditions to the vehicle, which will in turn affect the pressure of the air storage chamber 2 and the operation of the safety valve 22. On expressways, the vehicle's driving speed is usually high and relatively stable, and the air demand of the air suspension system is relatively stable, but the airflow generated by high-speed driving has a certain impact on the external pressure of the air storage chamber 2; when driving on urban roads, the vehicle frequently starts and stops, accelerates and decelerates, which will cause the pressure of the air storage chamber 2 to fluctuate frequently; on off-road roads, due to the rugged road conditions, the vehicle bumps violently, which will not only cause the pressure of the air storage chamber 2 to change due to vibration, but also increase the wear and leakage risks of components. Therefore, the setting of the pre-adjustment opening of the safety valve 22 under different road types needs to be different. The road type is obtained as follows: Comprehensive judgment is made using the vehicle's camera and image processing technology as well as the inertial measurement unit (IMU) data. The camera captures the image of the road in front of the vehicle, and analyzes the characteristics of the road through the image recognition algorithm, such as the width of the road, marking lines, road surface material and other information, to preliminarily judge the road type. For example, if the image shows that the road is wide, the markings are clear, and there is a central divider, it may be a highway; if the road is narrow, there are many buildings around it, and there are frequent intersections, it may be a city road. At the same time, the IMU measures the acceleration, angular velocity and other information of the vehicle, and further assists in determining the road type by analyzing the characteristics of the vehicle's vibration frequency, amplitude, and driving posture changes. For example, when driving on an off-road road, the IMU will detect the frequent up and down bumps and large lateral swings of the vehicle. Combined with the camera image recognition results, it is determined that the vehicle is driving on an off-road road, thereby providing accurate road type information for the safety valve 22 pre-adjustment opening analysis model, so that it can perform reasonable opening calculations and adjustments according to different road conditions.

[0058] Step S420, input the altitude data, climate type, and road type of the current position of the vehicle into the adjustment model of the pre-adjustment opening analysis model of the safety valve 22, and output the adjusted pre-adjustment opening analysis model of the safety valve 22.

[0059] Regarding the adjustment model of the safety valve 22 pre-adjustment opening analysis model, this is a model specifically used to dynamically adjust the safety valve 22 pre-adjustment opening analysis model according to external parameters (altitude data, climate type, road type). It is constructed based on a large amount of experimental data, actual vehicle operation data and theoretical physical principles. By establishing a quantitative relationship between external parameters and the internal parameters of the safety valve 22 pre-adjustment opening analysis model, the original model is accurately corrected to adapt to different operating environments and ensure the accuracy and reliability of the safety valve 22 pre-adjustment opening value.

[0060] The adjustment model workflow is as follows: 1. Data input and parameter mapping: The adjustment model receives the altitude data, climate type, and road type of the vehicle's current location as input. For altitude data, for example, when the altitude is 2000 meters, it will affect the physical properties of the gas, such as the atmospheric pressure is about 80% of the sea level (according to the standard atmospheric model), which will cause the pressure difference between the inside and outside of the gas storage chamber 2 to change. The adjustment model will map the altitude data to the pressure correction coefficient, assuming that the pressure correction coefficient is 0.9 for every 1000 meters increase in altitude (that is, the pressure-related calculation parameters need to be multiplied by 0.9). For climate types, such as high temperature and high humidity climates. High temperature will cause the gas to expand. Assuming that the gas volume expansion coefficient is 1.03 for every 10°C increase in temperature (approximately calculated based on the ideal gas state equation), the adjustment model will adjust the calculation parameters of the pressure change rate of the gas storage chamber 2 according to this coefficient. High humidity environment may affect the accuracy of the sensor. If the humidity exceeds 80%, the adjustment model will correct the sensor measurement compensation parameters, such as increasing the compensation value by 5%, to ensure that the data input into the safety valve 22 pre-adjustment opening analysis model is more accurate. For road types, such as off-road roads. Due to the severe bumps on off-road roads, the vibration of the vehicle has a greater impact on the pressure of the air storage chamber 2 and the safety valve 22. The adjustment model will set the vibration influence coefficient according to the degree of bumpiness of the off-road road. Assuming that the bump amplitude is within a certain range, the vibration influence coefficient is 1.2. This means that when calculating the pre-adjustment opening of the safety valve 22, it is necessary to consider the increase in pressure fluctuations caused by vibration and adjust the calculation parameters accordingly. 2. Model adjustment algorithm and calculation: The adjustment model adopts an algorithm based on a combination of rules and data fitting. Taking the altitude as an example, when the altitude data is input, the preset altitude-pressure correction coefficient table is used for search and interpolation calculation to obtain an accurate pressure correction coefficient. For climate types and road types, similar rule tables and data fitting curves are used for parameter adjustment.

[0061] Step S430, outputting the pre-adjustment opening value of the safety valve 22 according to the evaluation results of the pressure change rate and the gas leakage rate and the pre-adjustment opening analysis model of the safety valve 22 that has been adjusted.

[0062] In addition, the intelligent control system also includes a step of adjusting the opening of the safety valve 22 in parallel with the pre-adjusted opening value of the safety valve 22 obtained, which is as follows:

[0063] Step SA00, obtaining the regulation data, pressure change rate, gas leakage rate and geographic information related features of the safety valve 22 within a preset past time range, wherein the geographic information related features include altitude change features, climate type classification features and road bump features.

[0064] Preset past time range: This is a pre-set time interval used to review and collect data information related to the air storage chamber 2 and the safety valve 22 during this time period. By determining such a range, the recent system operation status can be comprehensively considered to more comprehensively and accurately analyze the potential problems or failure trends that may exist in the safety valve 22. For example, the past 10 minutes, half an hour, or several hours can be set as the preset past time range, and the specific duration will be determined based on actual needs and vehicle operation characteristics.

[0065] The adjustment data of the safety valve 22 refers to the relevant record data of each opening adjustment of the safety valve 22 within the past time range. It includes detailed information such as the specific opening value of each adjustment of the safety valve 22 (for example, it has been adjusted to 5%, 10%, etc.), the time node of the adjustment (accurate to specific hours, minutes and seconds, such as an opening adjustment at 10:20:30), and the triggering reason of the adjustment (whether the adjustment is caused by excessive pressure rise or gas leakage, etc.). These data reflect the changes in the working state of the safety valve 22 in the past, which is of great significance for analyzing its performance stability and whether there are abnormalities.

[0066] Altitude change characteristics: reflect the changes in the altitude of the vehicle during driving. As the vehicle moves, the altitude of its location may rise or fall. For example, when the vehicle drives from a plain area to a mountainous area, the altitude gradually rises. This dynamic change in altitude will affect the pressure difference between the inside and outside of the gas storage chamber 2 and the physical properties of the gas (such as density, volume, etc.), which will in turn be related to the working state and adjustment requirements of the safety valve 22. The altitude data at different times can be obtained through the vehicle positioning system combined with the geographic information database, and its change characteristics can be further analyzed, such as calculating the rate of increase or decrease in altitude within a certain period of time.

[0067] Climate type classification characteristics: reflects the climate type of the vehicle's current environment, such as tropical, temperate, and cold climates, or more detailed climate conditions such as high temperature and high humidity, drought, and cold. Under different climate types, environmental factors such as temperature, humidity, and air pressure vary greatly, which will directly affect the state of the gas in the air storage chamber 2 and the performance of related components. For example, in high temperature climates, gas is easy to expand, which may cause the pressure in the air storage chamber 2 to rise faster; high humidity environments may affect sensor accuracy, moisture and rust resistance of components, etc. Temperature, humidity, air pressure and other data can be obtained through on-board meteorological sensors, and then the climate type classification characteristics can be determined based on certain climate classification standards.

[0068] Road bump characteristics: describes the flatness of the road on which the vehicle is traveling, that is, the degree to which the vehicle is subject to bumps and vibrations during driving. The degree of bumps varies with different road conditions. For example, highways are relatively flat and have less bumps, while off-road roads are rugged and have severe bumps. Strong bumps may cause vibration shocks to the air storage chamber 2 and its connecting parts, affecting the sealing, causing pressure fluctuations or increasing the risk of gas leakage, and may also interfere with the normal measurement of the sensor. The acceleration sensor on the vehicle can be used to detect parameters such as the vibration acceleration size and frequency of the vehicle during driving to characterize the road bump characteristics.

[0069] After acquiring the data from the above aspects, the intelligent control system will integrate and process the data to make it in a unified format and convenient for subsequent analysis. For example, the timestamps collected by different sensors are calibrated uniformly to ensure that the time corresponding to each data is accurate and consistent; possible abnormal values ​​(such as data points that are obviously deviated from the normal range due to temporary sensor failure or strong electromagnetic interference) are identified and eliminated or corrected using appropriate interpolation methods; the values ​​such as the pressure change rate and gas leakage rate are normalized to be within a reasonable numerical range that is easy to compare and analyze, etc., and finally a complete data set containing the regulation data, pressure change rate, gas leakage rate and geographic information related features of the safety valve 22 within a preset past time range is formed, preparing for the next step of inputting the fault prediction model.

[0070] Step SB00, input the historical adjustment data, pressure change rate, gas leakage rate and geographic information related features of the safety valve 22 within a preset past time range into the trained fault prediction model, and output the fault prediction severity value.

[0071] The trained fault prediction model is a model built based on a machine learning algorithm and trained with a large amount of historical data. It has the ability to predict possible future faults of the safety valve 22 by learning the intrinsic relationship and law between the historical adjustment data of the safety valve 22, the pressure change rate, the gas leakage rate, and the geographic information related features and the safety valve 22 fault. The model training process involves multiple links such as data preprocessing, feature engineering, model selection and training, model evaluation and optimization. The machine learning algorithm used can be a decision tree, a neural network, a support vector machine, etc., depending on the data characteristics and actual application requirements. Its purpose is to accurately output the severity value of the safety valve 22 fault prediction based on the relevant input data characteristics, and provide a strong basis for subsequent decision-making and maintenance.

[0072] The model workflow is as follows:

[0073] Data input and feature extraction: The historical adjustment data, pressure change rate, gas leakage rate and geographic information related features (altitude change characteristics, climate type classification characteristics, road bump characteristics) of the safety valve 22 within the preset past time range obtained in step SA00 are provided as input data to the trained fault prediction model. For example, the historical adjustment data includes five opening adjustment records of the safety valve 22 in the past 30 minutes. For example, the first adjustment was at 5 minutes, and the opening was adjusted from 0 to 5% because the pressure rise rate reached 0.05MPa / s; the pressure change rate data is a series of pressure change rate values ​​that change with time, such as the pressure change rate is stable at around 0.03MPa / s for a period of time, but suddenly rises to 0.1MPa / s at a specific moment; the gas leakage rate data shows that the average leakage rate in the past 10 minutes is 0.05L / min, but there is a short peak reaching 0.12L / min; among the geographic information related features, the altitude has gradually increased from 500 meters to 800 meters in the past 20 minutes, the climate type is temperate continental climate, and the road bump feature shows that the vehicle has passed through a relatively bumpy rural road, and the root mean square value of the bump acceleration is 0.5m / s 2 The model will extract features from these input data and convert them into a form suitable for model calculation, such as converting time series data into specific statistical features (mean, variance, maximum, minimum, etc.), encoding classification features (such as climate type), etc.

[0074] Model prediction calculation: Use the trained machine learning algorithm for prediction calculation. Taking the decision tree algorithm as an example, the decision tree model will start from the root node according to the characteristics of the input data, and gradually branch according to the value conditions of different characteristics until it reaches the leaf node. The leaf node is the interval or specific value of the predicted fault severity value. Assume that the decision tree model makes judgments based on the mean and maximum values ​​of the pressure change rate, the peak value of the gas leakage rate, and the altitude change rate. If the mean value of the pressure change rate is greater than 0.08MPa / s, the peak value of the gas leakage rate is greater than 0.1L / min, and the altitude rise rate is greater than 10 meters / minute, the model may predict that the fault severity is high, for example, the output fault severity value is 8 (assuming that the fault severity value range is 1-10, 10 means the most serious); if the mean value of the pressure change rate is between 0.03-0.08MPa / s, the peak value of the gas leakage rate is less than 0.1L / min, and the altitude change is relatively stable, the model may output a fault severity value between 3-5, corresponding to a medium level of fault risk. Different machine learning algorithms have different calculation logics, but generally they all make predictions based on the correlation between data features and faults.

[0075] Output fault severity value: After the model calculation, a fault prediction severity value is finally output. This value reflects the possibility and severity of the safety valve 22 failing in the future. For example, if the output fault severity value is 6, it means that the safety valve 22 has a high risk of failure, and it needs to be taken seriously and corresponding measures should be taken, such as increasing the monitoring frequency, preparing possible maintenance tools and accessories, etc., to provide a key basis for determining the associated hardware and processing solutions based on the fault severity value.

[0076] Step SC00, according to the corresponding relationship between the interval range of the fault prediction severity value and the associated hardware and processing solution, analyze and determine the associated hardware and processing solution, and send them to the terminal held by the relevant person in charge in a timely manner.

[0077] For example, the fault severity values ​​are divided into mild (1-3), moderate (4-6), severe (7-10) and other intervals. Each interval corresponds to a different hardware device combination and processing method, aiming to ensure that when the safety valve 22 has different degrees of failure risks, targeted measures can be taken to ensure the safe and stable operation of the air storage chamber 2 and the entire vehicle system, while optimizing resource utilization and reducing unnecessary intervention.

[0078] Interval range judgment and hardware and solution determination:

[0079] After obtaining the severity value of the fault prediction, first determine the range it falls in. For example, if the fault severity value is 4, it is in the medium range (4-6).

[0080] For the moderate fault range, the associated hardware may include some functional modules of the air suspension system, the fault diagnosis module of the in-vehicle local area network (CAN bus), the infotainment system display, etc. The solution is: the air suspension system automatically adjusts the working mode, such as switching from comfort mode to economy mode, reducing the demand for the pressure of the air storage chamber 2, and reducing some non-essential functions of the air suspension system (such as the suspension of the automatic body level adjustment function); the fault diagnosis module of the in-vehicle local area network comprehensively checks the communication status between various electronic control units related to the safety valve 22 to ensure normal data transmission. If communication abnormalities are found, try to perform self-repair or record detailed communication fault information for reference by maintenance personnel; the infotainment system display pops up a detailed fault information page, showing the specific content of the fault prediction, such as possible causes of the fault (slight sticking of the valve core, slight wear of the seal, etc.), the current pressure change trend chart and maintenance suggestions (such as checking the cleanliness of the valve core of the safety valve 22, checking the integrity of the seal, etc.).

[0081] Information sending and notification are as follows: The intelligent control system will promptly send the determined associated hardware and processing solutions to the terminal held by the relevant person in charge. For example, the information is sent to the mobile phones, tablets and other terminal devices of vehicle maintenance personnel through the on-board communication module (such as 4G / 5G module) in the form of text messages, dedicated APP push notifications or emails. The notification content includes detailed information such as the severity of the fault, the hardware equipment involved, the specific processing steps and the recommended processing time. For example, "The severity of the fault is moderate, involving the air suspension system, the CAN bus fault diagnosis module, and the infotainment system display. Processing solution: The air suspension system switches to economy mode and suspends the automatic body level adjustment function; the CAN bus performs communication status inspection and repair; the infotainment system displays fault details. It is recommended to check and handle within 2 hours." In this way, the relevant person in charge can understand the vehicle status in a timely manner and make corresponding preparations and arrangements to maintain and repair the vehicle at the appropriate time and place to ensure the normal operation and safety performance of the vehicle.

[0082] Example 2

[0083] like Figure 7 As shown, the structure is basically the same as that of Example 1, except that the air storage chamber 2 is independently arranged outside the threshold body 1. Compared with Example 1, this solution does not require the threshold body 1 to have a cavity 10, but it will occupy a larger volume.

[0084] Example 3

[0085] like Figure 8 As shown, the structure is basically the same as that of Example 1, except that the partition 101 is in an arc shape and is separately surrounded by the peripheral wall in the cavity 10 to form an air storage cavity 2.

[0086] Example 4

[0087] like Fig. 9As shown, the structure is basically the same as that of the embodiment 1, except that any chamber 11' located outside the sub-chamber 11 has four side walls, including an outer side wall 111' directly using a part of the peripheral wall of the door sill body 1, an inner side wall 112' directly using the side wall corresponding to the air storage chamber 2, and a first side wall 113' and a second side wall 114' connected to the outer side wall 111' and the inner side wall 112', and the first side wall 113' and / or the second side wall 114' are provided with reinforcing ribs 115' for auxiliary strengthening the strength of the outer side wall 111'. Such a design is considered that in order to ensure the strength of the air storage chamber 2 and the door sill body 1, the outer side wall 111' usually needs to be thicker, and through the reinforcing ribs 115', the thickness of the outer side wall 111' can be reduced while ensuring the strength of the air storage chamber 2 and the door sill body 1. Specifically, the reinforcing rib 115' includes an end portion that shares a common end 116' with the corresponding first side wall 113' or second side wall 114' and a terminal end 117' that is disposed in a bifurcated manner with the common end 116', and the terminal end 117' is connected to the outer side wall 111'. The reinforcing rib 115' is connected to the first side wall 113' or the second side wall 114' through the common end 116', and is connected to the outer side wall 111' through the terminal end 117', thereby supporting the outer side wall 111' and improving the strength of the air storage chamber 2 and the threshold body 1. In this embodiment, the reinforcing rib 115' is disposed on the outer side of the threshold assembly 1 along the width direction, considering that this side is the first side to be subjected to force. In addition, it should be noted that the reinforcing rib 115' can also be used in other positions, but at the same time, it will increase the processing difficulty of the threshold assembly 1.

Claims

1. A threshold assembly for a vehicle, comprising a threshold body (1), characterized in that: An independent gas storage chamber (2) for storing gas is provided on the door sill body (1), and the gas storage chamber (2) is connected to the air suspension system.

2. The door sill assembly according to claim 1, characterized in that: The threshold body (1) is provided with a sub-chamber (11) which is independently sealed into a tubular shape, and sealing covers (12; 13) are respectively provided along the two ends of the sub-chamber (11), and each of the sealing covers (12; 13) and the sub-chamber (11) together surround the air storage chamber (2).

3. The door sill assembly according to claim 2, characterized in that: The air storage chamber (2) is also provided with a first connector for connecting with the air suspension system and for air intake or air exhaust, or a second connector (21) with integrated air intake and air exhaust, and the first connector or the second connector (21) can be selectively adapted to the corresponding sealing cover (12; 13).

4. The door sill assembly according to claim 3, characterized in that: The sealing cover (12; 13) is provided with the second joint (21), the second joint (21) comprising a first connecting channel and a second connecting channel connected to the air source fluid of the air suspension system, and the first connecting channel or the second connecting channel is provided with a one-way valve capable of controlling one-way air intake or air outlet.

5. The door sill assembly according to claim 3 or 4, characterized in that: A cavity (10) is left inside the threshold body (1), and a partition (101) is also arranged in the cavity (10), and together with at least a part of the peripheral wall surrounding the cavity (10), the partition (101) forms the sub-chamber (11).

6. The door sill assembly according to claim 5, characterized in that: The partition (101) is plate-shaped and abuts against the peripheral wall of the cavity (10) to divide the cavity (10) into at least two sub-chambers (11) distributed vertically and / or horizontally. The sub-chamber (11) located in the center of each sub-chamber (11) and surrounded by a peripheral wall to form a closed tubular shape constitutes the air storage chamber (2).

7. The door sill assembly according to claim 6, characterized in that: The sealing cover (12; 13) at one end of the gas storage chamber (2) is provided with the second joint (21), and correspondingly, the sealing cover (12; 13) at the other end is provided with a safety valve (22) for adjusting the internal pressure of the gas storage chamber (2).

8. The door sill assembly according to any one of claims 2 to 4, characterized in that: Any chamber (11') located outside the sub-chamber (11) has four side walls, including an outer side wall (111') directly using a portion of the peripheral wall of the threshold body (1), an inner side wall (112') directly using the side wall corresponding to the air storage chamber (2), and a first side wall (113') and a second side wall (114') connected to the outer side wall (111') and the inner side wall (112'), wherein the first side wall (113') and / or the second side wall (114') are provided with reinforcing ribs (115') for assisting in strengthening the strength of the outer side wall (111').

9. The door sill assembly according to claim 8, characterized in that: The reinforcing rib (115') includes an end portion that shares a common end (116') with the corresponding first side wall (113') or second side wall (114') and an end portion (117') that is disposed in a bifurcated manner with the common end (116'), and the end portion (117') is connected to the outer side wall (111').

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