A method and system for evaluating robustness of trailer suspension

Abstract

The present invention discloses a method and system for evaluating the robustness of a trailer suspension, belonging to the technical field of vehicle suspension robustness evaluation, and comprising a data analysis module, a temperature detection module, a deformation detection module and an evaluation module. The data analysis module collects the expansion and contraction value, expansion and contraction frequency of an air spring and the numerical value of the lateral force of the suspension, and the evaluation module is used to evaluate the robustness of the suspension. The present invention can collect and process the lateral force data of the suspension when the vehicle is at different speeds and loads through the data analysis module, compare the collected data with various data of a standard suspension through the evaluation module, judge whether it is within a qualified range through the comparison value, evaluate the robustness of the suspension on a bumpy road section, and avoid the suspension being affected by the lateral impact force on the bumpy road section, resulting in a reduction in the suspension buffering effect, thereby affecting the safety of the vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle suspension robustness assessment, and more specifically, to a trailer suspension robustness assessment method and system. Background Art

[0002] The trailer suspension is a key component connecting the trailer and the tractor. It is used to support the load of the trailer and ensure the stability and comfort of the trailer during driving.

[0003] When a trailer is carrying goods through a bumpy road, the suspension part will generate a large pulling force. The air spring part of the air suspension can effectively play a buffering role through changes in air pressure during use, thereby reducing the vibration of the vehicle and improving the driver's feeling. It can also effectively ensure the stability of the goods and prevent the goods from tipping over or being damaged.

[0004] The requirements for trailer suspension are relatively strict, including rigidity, robustness and smoothness. When evaluating the robustness of air suspension, only the robustness of suspension during braking, acceleration or turning is often tested. However, when the vehicle passes through bumpy sections during operation, due to the vibration of the vehicle, and the front and body of the vehicle are connected by the suspension, the different bump amplitudes of the front and body of the vehicle will continuously squeeze the air suspension, thereby affecting the stability of the air suspension. When the vehicle passes through bumpy sections, it will continuously hit the inner wall of the concave part of the ground, causing the suspension to be subjected to a large lateral thrust. The existing suspension robustness evaluation method and system cannot collect data when the suspension is subjected to lateral thrust and evaluate the robustness of the suspension during bumps. Therefore, it is necessary to provide a trailer suspension robustness evaluation method and system. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a method and system for evaluating the robustness of a trailer suspension.

[0006] To solve the above problems, the present invention adopts the following technical solutions:

[0007] A method for evaluating the robustness of a trailer suspension comprises the following steps:

[0008] The data acquisition terminals of the data analysis module, the temperature detection module, and the deformation detection module are installed on the suspension to be evaluated, the force data of the suspension is collected by using the data analysis module, and the collected data is preprocessed;

[0009] When the data analysis module detects that the suspension is subjected to lateral force, the signal is transmitted to the temperature detection module, the temperature of the air spring part of the suspension is detected by the temperature detection module, the detected data is recorded, and then the data is transmitted to the evaluation module;

[0010] The deformation detection module is used to detect the deformation of the vehicle body and the frame, and the detected data is transmitted to the data analysis module. The data analysis module processes the deformation data to determine whether the frame or the body is deformed. When the frame and the body are deformed, it means that the suspension does not meet the standards. When the frame and the body are not deformed, the data is continued to be analyzed and the processed data is transmitted to the evaluation module;

[0011] After receiving the data from the temperature detection module and the data analysis module, the evaluation module compares the received data with the data obtained during the evaluation of the standard suspension to calculate the robustness value of the suspension to be evaluated, and evaluates the robustness of the suspension to be evaluated based on the ratio of the robustness values ​​of the suspension to be evaluated and the standard suspension.

[0012] A trailer suspension robustness assessment system, comprising:

[0013] Data analysis module: used to obtain the lateral force of the suspension air spring part when the test vehicle passes through the bumpy road section, and obtain the lateral force data of the suspension air spring part when the vehicle is driving on the bumpy road section;

[0014] When the air spring part of the suspension expands and contracts due to vibration, the temperature data of the air spring part of the suspension generated by friction is obtained through the temperature detection module;

[0015] According to the suspension extension and retraction state, the extension and retraction times of the suspension and the extension and retraction value of the air spring extension part are obtained when the test vehicle passes through a bumpy road section;

[0016] Evaluation module: Compare the expansion and contraction frequency and extension degree data of the air spring expansion and contraction part when the vehicle is loaded and unloaded at different speeds with the standard data to evaluate the robustness of the air spring expansion and contraction part under different conditions.

[0017] Furthermore, the data analysis module includes:

[0018] Data acquisition unit: collects the lateral force data of the suspension during continuous bumping when the vehicle is at different speeds and at different loads, and obtains the lateral force data of the suspension when the vehicle is traveling;

[0019] Collect the data of the extension and retraction degree and the number of extension and retraction times of the air spring extension part to obtain the data of the extension and retraction degree and the frequency of extension and retraction times of the air spring extension part when the vehicle is loaded and unloaded;

[0020] Data processing unit: used to analyze the expansion and contraction frequency of the air spring expansion and contraction part of the suspension when the vehicle is loaded and unloaded and in a continuous bumpy state, and to analyze the expansion and contraction data of the air spring expansion and contraction part of the vehicle when the vehicle is loaded and unloaded;

[0021] According to the data collected by the data acquisition module, the expansion and contraction signal of the expansion and contraction part of the air spring is made into a time domain graph, and the expansion and contraction frequency of the expansion and contraction part of the air spring is transformed into a spectrum diagram through Fourier transform to analyze the influence of the lateral force of the suspension on the expansion and contraction part of the air spring.

[0022] Further, the temperature detection module is used to monitor the temperature of the telescopic part of the air spring when it vibrates according to the vibration data collected by the data collection module, and collect the temperature data of the telescopic part of the air spring during the telescopic process of the air spring;

[0023] According to the collected temperature data, the temperature change is recorded and a waveform diagram is formed, and then the data is transmitted to the data processing unit.

[0024] Furthermore, the deformation detection module: monitors the deformation degree of the vehicle body and frame during bumps;

[0025] The degree of deformation of the vehicle body and frame when squeezed by the suspension connection when the vehicle is running smoothly is obtained according to the monitoring data, and the degree of deformation of the vehicle body and frame when squeezed by the suspension connection when the vehicle is bumpy is obtained according to the detection data;

[0026] The recovery data of the vehicle body and the frame after deformation are recorded, and the degree of recovery of the frame or the vehicle body after deformation is detected, and the data are transmitted to the data processing unit.

[0027] Furthermore, the suspension lateral force data collected by the data collection unit includes the lateral impact force received by the suspension when the vehicle moves horizontally and linearly and bumps;

[0028] Also, collect the lateral impact force on the suspension of the vehicle when passing through an inclined section or making an emergency lane change;

[0029] The expansion and contraction times and expansion and contraction values ​​of the suspension air spring are collected according to the different directions of the impact force.

[0030] Further, the data processing unit cleans, converts and standardizes the data collected by the data collection unit, and compares the collected data with the standard data, including the following steps:

[0031] The data processing unit calculates the lateral impact force on the vehicle suspension at different vehicle speeds or loads through the relationship between the vehicle speed and the vehicle load, and constructs a function graph through linear model calculation;

[0032] When the vehicle is subjected to different lateral impact forces, the influence of the lateral impact force on the suspension expansion frequency and expansion value is calculated, and the function graph is constructed through the neural network model calculation;

[0033] When the suspension to be evaluated is subjected to a frontal lateral impact force, the expansion and contraction frequency and expansion and contraction degree of the suspension to be evaluated are compared with the expansion and contraction frequency and expansion and contraction degree of the standard suspension when the suspension to be evaluated is subjected to a frontal lateral impact force, to obtain comparative data;

[0034] When the suspension to be evaluated is subjected to frontal and lateral impact forces at the same time, the expansion and contraction frequency and expansion and contraction degree of the suspension to be evaluated are compared with the expansion and contraction frequency and expansion and contraction degree of the standard suspension when they are subjected to frontal and lateral impact forces at the same time to obtain comparative data.

[0035] Furthermore, the data processing unit compares the deformation data and the restored data of the vehicle body and the frame to determine whether the vehicle body and the frame are damaged by using the following formula:

[0036] ;

[0037] Where P is the deformation difference, L max is the total deformation of the frame, L fou is the basic deformation of the frame or body when the vehicle is loaded and at rest or in steady driving, and K0 is the recovery amount of the body or frame after deformation;

[0038] The acquired deformation difference is transmitted to the evaluation module, which evaluates the status of the vehicle body or frame:

[0039] When P is equal to 1, the vehicle body or frame is in good condition;

[0040] When P is not equal to 1, the vehicle body or frame is deformed and in a damaged state.

[0041] Furthermore, the evaluation module receives the detection data from the data processing unit and the temperature detection module and calculates the robustness value of the suspension to be evaluated by using the following formula:

[0042] ;

[0043] Among them, Q is the robustness value of the suspension to be evaluated, F i is the bump frequency of the suspension to be evaluated when it passes through a bumpy road, F0 is the bump frequency of the standard suspension when it passes through a bumpy road section, and C i is the temperature of the suspension to be evaluated when the air spring is partially extended and retracted on a bumpy road, C0 is the temperature of the standard suspension when the air spring is partially extended and retracted on a bumpy road, B max is the maximum value each time the suspension air spring is partially contracted, B load It is the basic expansion and contraction value of the air spring part of the suspension when the vehicle is at rest or driving steadily during the load process. (B max -B load ) iIt is the increased contraction value of the air spring part when the vehicle is bumped during loading, and B0 is the increased contraction value of the air spring part when the standard suspension is loaded.

[0044] Furthermore, the evaluation module compares the calculated robustness value of the suspension to be evaluated with the robustness value calculated by the standard suspension.

[0045] When the ratio of the robustness value of the suspension to be evaluated to the robustness value of the standard suspension is within the allowable error range, the robustness of the suspension to be evaluated is in a qualified state;

[0046] When the ratio of the robustness value of the suspension to be evaluated to the robustness value of the standard suspension is beyond the allowable error range, the robustness of the suspension to be evaluated is in an unqualified state.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] (1) The present invention can collect and process the lateral force data of the suspension when the vehicle is at different speeds and loads through the data analysis module, and judge the influence of the lateral force on the air spring by collecting the deformation frequency of the air spring part and the expansion and contraction degree of the air spring. The collected data is compared with various data of the standard suspension through the evaluation module, and it is judged whether it is within the qualified range through the comparison value, and the robustness of the suspension on the bumpy road section is evaluated to avoid the suspension being affected by the lateral impact force on the bumpy road section, resulting in a reduction in the suspension buffering effect and affecting the safety of the vehicle.

[0049] (2) The present invention can detect the temperature of the air spring when it is extended and retracted through the temperature detection module. By detecting the temperature of the air spring, the state of the air spring can be determined to avoid the situation where the air spring temperature is too high, which leads to a decrease in the strength of metal parts and a decrease in the elasticity of the air spring during driving. When evaluating the suspension, the influence of temperature on the vibration frequency and extension value of the air spring can be determined.

[0050] (3) The present invention can determine the degree of deformation of the connection between the vehicle body and the frame and the suspension through the deformation detection module. When the vehicle body or the frame is deformed, it means that the suspension buffering effect does not meet the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic diagram of the system framework of the present invention;

[0052] Figure 2 Schematic diagram of the evaluation method of the present invention. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0054] See also Figure 1 to Figure 2 , a method for robustness assessment of a trailer suspension, comprising the following steps:

[0055] The data acquisition terminals of the data analysis module, the temperature detection module, and the deformation detection module are installed on the suspension to be evaluated, the force data of the suspension is collected by using the data analysis module, and the collected data is preprocessed;

[0056] When the data analysis module detects that the suspension is subjected to lateral force, the signal is transmitted to the temperature detection module, the temperature of the air spring part of the suspension is detected by the temperature detection module, the detected data is recorded, and then the data is transmitted to the evaluation module;

[0057] The deformation detection module is used to detect the deformation of the vehicle body and the frame, and the detected data is transmitted to the data analysis module. The data analysis module processes the deformation data to determine whether the frame or the body is deformed. When the frame and the body are deformed, it means that the suspension does not meet the standards. When the frame and the body are not deformed, the data is continued to be analyzed and the processed data is transmitted to the evaluation module;

[0058] After receiving the data from the temperature detection module and the data analysis module, the evaluation module compares the received data with the data obtained during the evaluation of the standard suspension to calculate the robustness value of the suspension to be evaluated, and evaluates the robustness of the suspension to be evaluated based on the ratio of the robustness values ​​of the suspension to be evaluated and the standard suspension.

[0059] A trailer suspension robustness assessment system, comprising:

[0060] Data analysis module: used to obtain the lateral force of the suspension air spring part when the test vehicle passes through the bumpy road section, and obtain the lateral force data of the suspension air spring part when the vehicle is driving on the bumpy road section;

[0061] When the air spring part of the suspension expands and contracts due to vibration, the temperature data of the air spring part of the suspension generated by friction is obtained through the temperature detection module;

[0062] According to the suspension extension and retraction state, the extension and retraction times of the suspension and the extension and retraction value of the air spring extension part are obtained when the test vehicle passes through a bumpy road section;

[0063] Evaluation module: Compare the expansion and contraction frequency and extension degree data of the air spring expansion and contraction part when the vehicle is loaded and unloaded at different speeds with the standard data to evaluate the robustness of the air spring expansion and contraction part under different conditions.

[0064] Data analysis modules include:

[0065] Data acquisition unit: collects the lateral force data of the suspension during continuous bumping when the vehicle is at different speeds and at different loads, and obtains the lateral force data of the suspension when the vehicle is traveling;

[0066] Collect the data of the extension and retraction degree and the number of extension and retraction times of the air spring extension part to obtain the data of the extension and retraction degree and the frequency of extension and retraction times of the air spring extension part when the vehicle is loaded and unloaded;

[0067] Data processing unit: used to analyze the expansion and contraction frequency of the air spring expansion and contraction part of the suspension when the vehicle is loaded and unloaded and in a continuous bumpy state, and to analyze the expansion and contraction data of the air spring expansion and contraction part of the vehicle when the vehicle is loaded and unloaded;

[0068] The expansion and contraction signal of the expansion and contraction part of the air spring is made into a time domain graph according to the data collected by the data acquisition module, and the expansion and contraction frequency of the expansion and contraction part of the air spring is transformed into a spectrum graph through Fourier transformation to analyze the influence of the lateral force of the suspension on the expansion and contraction part of the air spring;

[0069] The suspension lateral force data collected by the data acquisition unit includes the lateral impact force on the suspension when the vehicle moves horizontally and linearly and bumps;

[0070] Also, collect the lateral impact force on the suspension of the vehicle when passing through an inclined section or making an emergency lane change;

[0071] The expansion and contraction times and expansion and contraction values ​​of the suspension air spring part are collected according to different directions of the impact force;

[0072] The data processing unit cleans, converts and standardizes the data collected by the data collection unit, and compares the collected data with the standard data, including the following steps:

[0073] The data processing unit calculates the lateral impact force on the vehicle suspension at different vehicle speeds or loads through the relationship between the vehicle speed and the vehicle load, and constructs a function graph through linear model calculation;

[0074] When the vehicle is subjected to different lateral impact forces, the influence of the lateral impact force on the suspension expansion frequency and expansion value is calculated, and the function graph is constructed through the neural network model calculation;

[0075] When the suspension to be evaluated is subjected to a frontal lateral impact force, the expansion and contraction frequency and expansion and contraction degree of the suspension to be evaluated are compared with the expansion and contraction frequency and expansion and contraction degree of the standard suspension when the suspension to be evaluated is subjected to a frontal lateral impact force, to obtain comparative data;

[0076] When the suspension to be evaluated is subjected to frontal and lateral impact forces at the same time, the expansion and contraction frequency and expansion and contraction degree of the suspension to be evaluated are compared with the expansion and contraction frequency and expansion and contraction degree of the standard suspension when they are subjected to frontal and lateral impact forces at the same time to obtain comparative data.

[0077] By adopting the above technical scheme, the lateral impact force on the suspension is detected when the vehicle passes through a bumpy road section, and the influence of the lateral impact force on the suspension is determined. When the air spring of the suspension is hindered by the lateral force, the expansion and contraction frequency of the air spring is detected, and the expansion and contraction value of the air spring is detected. The expansion and contraction frequency of the air spring can be used to determine whether the air spring has undergone a sufficient number of deformations during the test. The number of times the air spring effectively acts as a buffer during deformation can be calculated by combining the expansion and contraction value of the air spring at each deformation with the expansion and contraction frequency. The prepared spectrum diagram is then compared with the spectrum diagram of the standard suspension during the evaluation process to determine whether the ratio result is within the allowable range, thereby evaluating whether the robustness of the suspension is qualified.

[0078] Temperature detection module: used to monitor the temperature of the telescopic part of the air spring when it vibrates according to the vibration data collected by the data collection module, and collect the temperature data of the telescopic part of the air spring during the telescopic process of the air spring;

[0079] According to the collected temperature data, the temperature change is recorded and a waveform diagram is formed, and then the data is transmitted to the data processing unit.

[0080] By adopting the above technical solution, the temperature of the air spring when it is deformed is detected by the temperature detection module, and the temperature of the air spring is compared with the temperature of the air spring of the standard suspension to determine whether the temperature of the air spring is in a qualified range. When the temperature of the suspension is not within the qualified range, it is marked as unqualified. When the temperature is in the qualified range, the detected data is transmitted to the evaluation module, and the evaluation module performs a comprehensive evaluation on the suspension to be evaluated.

[0081] The data processing unit compares the deformation data and the restored data of the vehicle body and frame using the following formula to determine whether the vehicle body and frame are damaged:

[0082] ;

[0083] Where P is the deformation difference, L max is the total deformation of the frame, L fouis the basic deformation of the frame or body when the vehicle is loaded and at rest or in steady driving, and K0 is the recovery amount of the body or frame after deformation;

[0084] The acquired deformation difference is transmitted to the evaluation module, which evaluates the status of the vehicle body or frame:

[0085] When P is equal to 1, the vehicle body or frame is in good condition;

[0086] When P is not equal to 1, the vehicle body or frame is deformed and in a damaged state.

[0087] By adopting the above technical solution, after calculation by the data processing unit, the evaluation module determines whether the vehicle body or frame is damaged. When the vehicle body or frame is damaged, it means that the suspension is unqualified and cannot effectively play a role in buffering and unloading. When the vehicle body or frame is damaged, the data calculated by the data processing unit is recorded.

[0088] The evaluation module receives the detection data from the data processing unit and the temperature detection module and calculates the robustness value of the suspension to be evaluated using the following formula:

[0089] ;

[0090] Among them, Q is the robustness value of the suspension to be evaluated, F i is the bump frequency of the suspension to be evaluated when it passes through a bumpy road, F0 is the bump frequency of the standard suspension when it passes through a bumpy road section, and C i is the temperature of the suspension to be evaluated when the air spring is partially extended and retracted on a bumpy road, C0 is the temperature of the standard suspension when the air spring is partially extended and retracted on a bumpy road, B max is the maximum value each time the suspension air spring is partially contracted, B load It is the basic expansion and contraction value of the air spring part of the suspension when the vehicle is at rest or driving steadily during the load process. (B max -B load ) i It is the additional contraction value of the air spring part when the vehicle is bumped during loading, and B0 is the additional contraction value of the air spring part when the standard suspension is loaded;

[0091] The evaluation module compares the calculated robustness value of the suspension to be evaluated with the robustness value calculated by the standard suspension.

[0092] When the ratio of the robustness value of the suspension to be evaluated to the robustness value of the standard suspension is within the allowable error range, the robustness of the suspension to be evaluated is in a qualified state;

[0093] When the ratio of the robustness value of the suspension to be evaluated to the robustness value of the standard suspension is beyond the allowable error range, the robustness of the suspension to be evaluated is in an unqualified state.

[0094] By adopting the above technical solution, the evaluation module comprehensively evaluates the suspension based on the vibration frequency, expansion value, and temperature of the air spring of the suspension. The evaluation value is obtained by superimposing and comparing multiple data and taking the average value. The obtained evaluation value is then compared with the evaluation value obtained by the standard suspension to determine whether the suspension to be evaluated is qualified.

[0095] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for evaluating the robustness of a trailer suspension, comprising the following steps: The data acquisition terminals of the data analysis module, the temperature detection module, and the deformation detection module are installed on the suspension to be evaluated, the force data of the suspension is collected by using the data analysis module, and the collected data is preprocessed; When the data analysis module detects that the suspension is subjected to lateral force, the signal is transmitted to the temperature detection module, the temperature of the air spring part of the suspension is detected by the temperature detection module, the detected data is recorded, and then the data is transmitted to the evaluation module; The deformation detection module is used to detect the deformation of the vehicle body and the frame, and the detected data is transmitted to the data analysis module. The data analysis module processes the deformation data to determine whether the frame or the body is deformed. When the frame and the body are deformed, it means that the suspension does not meet the standards. When the frame and the body are not deformed, the data is continued to be analyzed and the processed data is transmitted to the evaluation module; After receiving the data from the temperature detection module and the data analysis module, the evaluation module compares the received data with the data obtained during the evaluation of the standard suspension to calculate the robustness value of the suspension to be evaluated, and evaluates the robustness of the suspension to be evaluated based on the ratio of the robustness values ​​of the suspension to be evaluated and the standard suspension.

2. A trailer suspension robustness assessment system, characterized in that: include: Data analysis module: used to obtain the lateral force of the suspension air spring part when the test vehicle passes through the bumpy road section, and obtain the lateral force data of the suspension air spring part when the vehicle is driving on the bumpy road section; When the air spring part of the suspension expands and contracts due to vibration, the temperature data of the air spring part of the suspension generated by friction is obtained through the temperature detection module; According to the suspension expansion and contraction state, the expansion and contraction times of the suspension and the expansion and contraction value of the air spring expansion and contraction part when the test vehicle passes through a bumpy road section are obtained; Evaluation module: Compare the expansion and contraction frequency and expansion and contraction degree data of the air spring expansion and contraction part when the vehicle is loaded and unloaded at different speeds with the standard data to evaluate the robustness of the air spring expansion and contraction part under different conditions; Data analysis modules include: Data acquisition unit: collects the lateral force data of the suspension during continuous bumping when the vehicle is at different speeds and at different loads, and obtains the lateral force data of the suspension when the vehicle is traveling; Collect the data of the extension and retraction degree and the number of extension and retraction times of the air spring extension part to obtain the data of the extension and retraction degree and the frequency of extension and retraction times of the air spring extension part when the vehicle is loaded and unloaded; Data processing unit: used to analyze the expansion and contraction frequency of the air spring expansion and contraction part of the suspension when the vehicle is loaded and unloaded and in a continuous bumpy state, and to analyze the expansion and contraction data of the air spring expansion and contraction part of the vehicle when the vehicle is loaded and unloaded; The expansion and contraction signal of the expansion and contraction part of the air spring is made into a time domain graph according to the data collected by the data acquisition module, and the expansion and contraction frequency of the expansion and contraction part of the air spring is transformed into a spectrum graph through Fourier transformation to analyze the influence of the lateral force of the suspension on the expansion and contraction part of the air spring; The evaluation module receives the detection data from the data processing unit and the temperature detection module and calculates the robustness value of the suspension to be evaluated using the following formula: ； Among them, Q is the robustness value of the suspension to be evaluated, F i is the bump frequency of the suspension to be evaluated when it passes through a bumpy road, F0 is the bump frequency of the standard suspension when it passes through a bumpy road section, and C i is the temperature of the suspension to be evaluated when the air spring is partially extended and retracted on a bumpy road, C0 is the temperature of the standard suspension when the air spring is partially extended and retracted on a bumpy road, B max is the maximum value each time the suspension air spring is partially contracted, B load It is the basic expansion and contraction value of the air spring part of the suspension when the vehicle is at rest or driving steadily during the loading process. (B max -B load ) i It is the increased contraction value of the air spring part when the vehicle is bumped during loading, and B0 is the increased contraction value of the air spring part when the standard suspension is loaded.

3. A trailer suspension robustness assessment system according to claim 2, characterized in that: Temperature detection module: used to monitor the temperature of the telescopic part of the air spring when it vibrates according to the vibration data collected by the data collection module, and collect the temperature data of the telescopic part of the air spring during the telescopic process of the air spring; According to the collected temperature data, the temperature change is recorded and a waveform diagram is formed, and then the data is transmitted to the data processing unit.

4. A trailer suspension robustness assessment system according to claim 3, characterized in that: Deformation detection module: monitors the deformation of the vehicle body and frame during bumps; The degree of deformation of the vehicle body and frame when squeezed by the suspension connection when the vehicle is running smoothly is obtained according to the monitoring data, and the degree of deformation of the vehicle body and frame when squeezed by the suspension connection when the vehicle is bumpy is obtained according to the detection data; The recovery data of the vehicle body and the frame after deformation are recorded, and the degree of recovery of the frame or the vehicle body after deformation is detected, and the data are transmitted to the data processing unit.

5. A trailer suspension robustness assessment system according to claim 4, characterized in that: The suspension lateral force data collected by the data acquisition unit includes the lateral impact force on the suspension when the vehicle moves horizontally and linearly and bumps; Also, collect the lateral impact force on the suspension of the vehicle when passing through an inclined section or making an emergency lane change; The expansion and contraction times and expansion and contraction values ​​of the suspension air spring are collected according to the different directions of the impact force.

6. A trailer suspension robustness assessment system according to claim 5, characterized in that: The data processing unit cleans, converts and standardizes the data collected by the data collection unit, and compares the collected data with the standard data, including the following steps: The data processing unit calculates the lateral impact force on the vehicle suspension at different vehicle speeds or loads through the relationship between the vehicle speed and the vehicle load, and constructs a function graph through linear model calculation; When the vehicle is subjected to different lateral impact forces, the influence of the lateral impact force on the suspension expansion frequency and expansion value is calculated, and the function graph is constructed through the neural network model calculation; When the suspension to be evaluated is subjected to a frontal lateral impact force, the expansion and contraction frequency and expansion and contraction degree of the suspension to be evaluated are compared with the expansion and contraction frequency and expansion and contraction degree of the standard suspension when the suspension to be evaluated is subjected to a frontal lateral impact force, to obtain comparative data; When the suspension to be evaluated is subjected to frontal and lateral impact forces at the same time, the expansion and contraction frequency and expansion and contraction degree of the suspension to be evaluated are compared with the expansion and contraction frequency and expansion and contraction degree of the standard suspension when they are subjected to frontal and lateral impact forces at the same time to obtain comparative data.

7. A trailer suspension robustness assessment system according to claim 6, characterized in that: The data processing unit compares the deformation data and the restored data of the vehicle body and frame using the following formula to determine whether the vehicle body and frame are damaged: ； Where P is the deformation difference, L max is the total deformation of the frame, L fou is the basic deformation of the frame or body when the vehicle is loaded and at rest or in steady driving, and K0 is the recovery amount of the body or frame after deformation; The acquired deformation difference is transmitted to the evaluation module, which evaluates the status of the vehicle body or frame: When P is equal to 1, the vehicle body or frame is in good condition; When P is not equal to 1, the vehicle body or frame is deformed and in a damaged state.

8. The trailer suspension robustness assessment system according to claim 7, characterized in that: The evaluation module compares the calculated robustness value of the suspension to be evaluated with the robustness value calculated by the standard suspension. When the ratio of the robustness value of the suspension to be evaluated to the robustness value of the standard suspension is within the allowable error range, the robustness of the suspension to be evaluated is in a qualified state; When the ratio of the robustness value of the suspension to be evaluated to the robustness value of the standard suspension is beyond the allowable error range, the robustness of the suspension to be evaluated is in an unqualified state.

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