Shock absorber abnormal sound suppression method, device and equipment based on pavement preview and storage medium

Abstract

The invention discloses a shock absorber abnormal sound suppression method, device and equipment based on road surface preview and a storage medium, and relates to the technical field of automobile shock absorption. The method comprises the steps that feature information of a road surface in front of a vehicle is obtained in real time; when the feature information is that the road surface prone to abnormal sound of the shock absorber exists in front, the driving state parameters of the vehicle are obtained, and the driving state parameters comprise the current vehicle speed, the acceleration and the steering wheel rotating angle; when the acceleration does not exceed a preset acceleration threshold value and the steering angle of the steering wheel does not exceed a preset steering angle threshold value, a shock absorber abnormal sound suppression strategy table is inquired based on the road surface feature information and the current vehicle speed, and the working current of a shock absorber is determined; the damping force of the shock absorber is adjusted based on the working current so as to suppress abnormal sound of the shock absorber, the proper damping force of the shock absorber is selected through the shock absorber control unit in combination with the vehicle driving state signal, and therefore the abnormal sound of the shock absorber is suppressed, and the requirement for comfort of a user is met at zero cost.

Description

Technical Field

[0001] The present application relates to the technical field of automobile vibration reduction, and in particular to a method, device, equipment and storage medium for suppressing abnormal noise of a shock absorber based on road surface preview. Background Art

[0002] Users are increasingly demanding on the car experience. Abnormal noises throughout the vehicle have a significant impact on driving comfort, with shock absorber noises ("thumping noises") occurring frequently and severely impacting the driving experience. When a car is driving on special roads such as cement grooved roads, jointed roads, and bad roads, the shock absorber makes a noticeable thumping noise, resulting in poor sound quality, which is an important source of noise affecting the car's sound quality. Currently, commonly used optimization solutions include: adjusting shock absorber parameters such as the throttling area of the flow valve, oil viscosity, gas pressure in the oil storage chamber, and the initial preload of the restoring valve to reduce the damping force of the shock absorber; reducing the stiffness of the bushing on the shock absorber; increasing the stiffness of the wheel arch or increasing the point-dynamic stiffness of the shock absorber installation to reduce the sensitivity of the vehicle body. All of the above solutions will result in structural design changes, making them difficult to implement in the later stages of product development, while also increasing costs and cycles.

[0003] When a vehicle is traveling on bumpy roads such as cement grooved roads, jointed roads, and pothole-filled roads, in order to ensure the vehicle's handling stability, the CDC shock absorber damping is often large, resulting in obvious abnormal noise from the CDC shock absorber. Market complaints are increasing. How to solve the abnormal noise of the shock absorber on bumpy roads such as cement grooved roads, jointed roads, and dilapidated roads while ensuring the vehicle's handling stability has become a major problem.

[0004] The above content is only used to assist in understanding the technical solution of this application and does not constitute an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of this application is to provide a method, device, equipment and storage medium for suppressing abnormal noise of shock absorbers based on road surface preview, aiming to solve the technical problem of loud abnormal noise of vehicle shock absorbers.

[0006] To achieve the above objectives, the present application proposes a method for suppressing abnormal noise of a shock absorber based on road surface preview. The method for suppressing abnormal noise of a shock absorber based on road surface preview comprises:

[0007] Obtain characteristic information of the road ahead of the vehicle in real time;

[0008] When the characteristic information indicates that there is a road surface ahead where shock absorber abnormal noise is likely to occur, obtaining driving state parameters of the vehicle, wherein the driving state parameters include current vehicle speed, acceleration, and steering wheel angle;

[0009] When the acceleration does not exceed a preset acceleration threshold and the steering wheel angle does not exceed a preset angle threshold, querying a shock absorber abnormal noise suppression strategy table based on the road feature information and the current vehicle speed to determine an operating current of the shock absorber;

[0010] The damping force of the shock absorber is adjusted based on the operating current to suppress abnormal sound of the shock absorber.

[0011] In one embodiment, the step of acquiring characteristic information of the road surface in front of the vehicle in real time includes:

[0012] Recognizing a road surface image of the road ahead of the vehicle;

[0013] Matching the road surface image with a pre-stored road surface feature classification model to obtain a matching result;

[0014] When the matching result indicates that the road ahead of the vehicle is a speed bump, a cement grooved road, or a pothole-prone road, it is determined that the characteristic information indicates that there is a road ahead that is prone to abnormal noise from the shock absorber.

[0015] In one embodiment, before the step of querying the shock absorber abnormal noise suppression strategy table, the method further includes:

[0016] When the vehicle is on a road surface prone to abnormal noise from the shock absorber, the vehicle speed is increased by a first preset step length, and the operating current of the shock absorber is decreased by a second preset step length;

[0017] collecting a noise signal and a vibration signal of a shock absorber in a vehicle in real time, performing spectrum analysis on the noise signal and the vibration signal of the shock absorber, and obtaining an analysis result;

[0018] When the analysis result shows that the noise signal is less than or equal to a preset target value and the amplitude changes of the noise signal and the shock absorber vibration signal are synchronized within a preset frequency band, the shock absorber operating current corresponding to the current vehicle speed is recorded and a shock absorber abnormal noise suppression strategy table is determined.

[0019] In one embodiment, the step of performing spectrum analysis on the noise signal and the vibration signal of the shock absorber includes:

[0020] Separate the abnormal sound frequency band of the noise signal by filtering and replaying technology;

[0021] Aligning the abnormal sound frequency band with the frequency band of the vibration signal of the shock absorber in the time domain;

[0022] When the amplitude changes of the noise signal and the vibration signal of the shock absorber are consistent, the current operating current is determined to be an effective suppression parameter.

[0023] In one embodiment, the step of adjusting the damping force of the shock absorber based on the operating current to suppress abnormal noise of the shock absorber includes:

[0024] According to the mapping relationship between the current vehicle speed and the operating current stored in the shock absorber abnormal noise suppression strategy table, the operating current of the shock absorber is adjusted in real time so that the damping force of the shock absorber decreases as the operating current decreases, so as to suppress abnormal noise in the vehicle. The adjustment process of the operating current is dynamically matched with the vehicle driving state. When the vehicle is driving on a road surface prone to abnormal noise, the adjustment amplitude of the operating current is dynamically corrected based on the real-time feedback of the road surface characteristic information and the current vehicle speed.

[0025] In one embodiment, the step of determining whether the amplitude changes of the noise signal and the vibration signal of the vibration absorber within the preset frequency band are synchronized includes:

[0026] Performing time domain alignment on the noise signal and the shock absorber vibration signal to ensure that their time axes are consistent;

[0027] Extracting the noise signal amplitude sequence and the vibration signal amplitude sequence within a preset frequency band;

[0028] A correlation coefficient between the noise signal amplitude sequence and the vibration signal amplitude sequence is determined, and when the correlation coefficient is greater than a preset value, it is determined that the amplitude changes are synchronized.

[0029] In one embodiment, the method further comprises:

[0030] When the acceleration exceeds a preset acceleration threshold or the steering wheel angle exceeds a preset angle threshold, the shock absorber abnormal noise suppression strategy is suspended until the driving state parameter recovers to not exceed the preset threshold, and then the suppression strategy is reactivated.

[0031] In addition, to achieve the above-mentioned purpose, the present application also proposes a shock absorber abnormal noise suppression device based on road surface pre-aiming, the device comprising:

[0032] The first acquisition module is used to acquire characteristic information of the road surface in front of the vehicle in real time;

[0033] a second acquisition module, configured to acquire driving state parameters of the vehicle when the characteristic information indicates that there is a road surface ahead that is prone to abnormal shock absorber noise, wherein the driving state parameters include current vehicle speed, acceleration, and steering wheel angle;

[0034] a query module, configured to query a shock absorber abnormal noise suppression strategy table based on the road surface characteristic information and the current vehicle speed to determine an operating current of the shock absorber when the acceleration does not exceed a preset acceleration threshold and the steering wheel angle does not exceed a preset angle threshold;

[0035] A control module is configured to adjust the damping force of the shock absorber based on the operating current to suppress abnormal noise of the shock absorber.

[0036] In addition, to achieve the above-mentioned purpose, the present application also proposes a device for suppressing abnormal noise of a shock absorber based on road surface preview, the device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the method for suppressing abnormal noise of a shock absorber based on road surface preview as described above.

[0037] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium and stores a computer program. When the computer program is executed by a processor, the steps of the shock absorber abnormal noise suppression method based on road surface preview as described above are implemented.

[0038] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the steps of the shock absorber abnormal noise suppression method based on road surface preview as described above.

[0039] One or more technical solutions proposed in this application have at least the following technical effects:

[0040] Acquire characteristic information of the road surface in front of the vehicle in real time; when the characteristic information indicates that there is a road surface in front that is prone to shock absorber noise, obtain the vehicle's driving state parameters, where the driving state parameters include the current vehicle speed, acceleration and steering wheel angle; when the acceleration does not exceed the preset acceleration threshold and the steering wheel angle does not exceed the preset angle threshold, query the shock absorber noise suppression strategy table based on the road surface characteristic information and the current vehicle speed to determine the operating current of the shock absorber; adjust the shock absorber damping force based on the operating current to suppress the shock absorber noise, and combine the vehicle driving state signal to select the appropriate shock absorber damping force through the shock absorber control unit, thereby suppressing the shock absorber noise and meeting the user's comfort requirements at zero cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0043] Figure 1 A flow chart of the first embodiment of the shock absorber noise suppression method based on road surface previewing provided in this application;

[0044] Figure 2A schematic diagram of the vehicle camera installation position provided in Example 1 of the shock absorber abnormal noise suppression method based on road surface preview of this application;

[0045] Figure 3 A schematic diagram of the installation position of a vehicle-mounted laser radar provided in Example 1 of the shock absorber abnormal noise suppression method based on road surface previewing of this application;

[0046] Figure 4 The CDC shock absorber damping force curve provided in Example 1 of the shock absorber abnormal noise suppression method based on road surface pre-aiming of this application;

[0047] Figure 5 A flow chart of the second embodiment of the shock absorber noise suppression method based on road surface previewing provided in this application;

[0048] Figure 6 This is a schematic diagram of the module structure of the shock absorber abnormal noise suppression device based on road surface pre-aiming according to an embodiment of the present application;

[0049] Figure 7 Schematic diagram of the device structure of the hardware operating environment involved in the shock absorber abnormal noise suppression method based on road surface preview in the embodiment of the present application.

[0050] The purpose, features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0051] It should be understood that the specific embodiments described herein are merely used to explain the technical solutions of the present application and are not intended to limit the present application.

[0052] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0053] It should be noted that the execution subject of this embodiment may be a computing service device with data processing, network communication, and program execution capabilities, such as a tablet computer, personal computer, or mobile phone, or an electronic device capable of performing the aforementioned functions, such as a shock absorber noise suppression device based on road surface pre-targeting. This embodiment and the following embodiments will be described below using the shock absorber noise suppression device based on road surface pre-targeting as an example.

[0054] Based on this, the embodiment of the present application provides a method for suppressing abnormal noise of a shock absorber based on road surface preview, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the shock absorber abnormal noise suppression device method based on road surface previewing of this application.

[0055] In this embodiment, the shock absorber abnormal noise suppression device method based on road surface preview includes steps S10 to S40:

[0056] Step S10, acquiring characteristic information of the road surface in front of the vehicle in real time;

[0057] In the specific implementation, the road surface feature information ahead is obtained based on the road surface preview system, such as detecting whether there is a road surface ahead where shock absorber abnormal noise is prone to occur (such as speed bumps, cement grooved roads, joint roads, potholes, etc.).

[0058] It should be noted that road surface pre-sighting technology uses cameras, lidar, and other sensors in the vehicle's environmental perception system to proactively identify road surface information and adjust the shock absorber's damping characteristics based on this information and vehicle status. It can predict and identify road features such as speed bumps, potholes, and slippery surfaces, enabling more optimal suspension control and enhancing ride comfort. For example, pre-sighting can proactively detect speed bumps ahead and proactively apply millisecond-level damping control, effectively reducing vertical impact by approximately 15% when negotiating the bump. Combined with adaptive torque control, the overall impact of the obstacle is reduced by 31%. Road surface pre-sighting accurately identifies and classifies different road surface types, including smooth, uneven, potholed, and rugged mountain roads. It can generally identify road features and elevation curves within a range of 5-150 meters ahead of the vehicle with an accuracy of up to ±3mm, and over 99% accuracy within 15 meters.

[0059] The pain point of traditional CDC shock absorbers is that they react too late, but the road preview system can achieve foresight and control in advance to avoid abnormal noise from the shock absorber.

[0060] As cars become more intelligent, their environmental perception systems are equipped with sensors such as cameras and lidar. Road surface preview can be achieved using a single sensor recognition technology, such as a camera, lidar, or other environmental perception sensor, or by integrating multiple sensor recognition technologies.

[0061] Camera-based road surface recognition methods such as Figure 2 As shown, the forward-facing camera is mounted at point C above the vehicle's roof. It captures road images within a certain range in front of the vehicle, enabling it to identify road conditions. The specific process is as follows: the forward-facing camera captures road images, extracts road features based on these images, and then compares them with a road feature classification model to determine the road type (e.g., speed bump, cement grooved road, jointed road, pothole road, etc.).

[0062] Road surface recognition based on LiDAR Figure 3As shown in the figure, compared to cameras, lidar is more robust to varying lighting conditions and is gaining widespread application in intelligent vehicle environmental perception research. Vehicle-mounted lidar is mounted on a bracket above the vehicle's roof and can acquire point cloud data of the road surface within a certain range around the vehicle. Due to the varying reflectivity of the laser beam on different surfaces, the reflection intensity distribution detected by lidar varies across various road surfaces. Therefore, the reflection intensity distribution model parameters are extracted as road features and combined with a road feature classification model to perform road surface recognition.

[0063] In a feasible implementation, step S10 may include steps A11 to A14:

[0064] Step A11: Recognizing a road surface image of the road ahead of the vehicle;

[0065] Step A12: matching the road surface image with a pre-stored road surface feature classification model to obtain a matching result;

[0066] Step A13: When the matching result shows that the road ahead of the vehicle is a speed bump, a cement grooved road, or a pothole road, it is determined that the characteristic information indicates that there is a road ahead that is prone to abnormal shock absorber noise.

[0067] CDC (Continuous Damping Control) shock absorbers feature continuously variable damping. By receiving information from sensors, the CAN (Controller Area Network), and driver input, the Electronic Control Unit (ECU) performs comprehensive processing and outputs commands to dynamically adjust the shock absorber's damping force, thereby improving vehicle handling stability and driving smoothness. For vehicles equipped with semi-active CDC shock absorbers, controlling the CDC shock absorber's damping force can improve driving stability. The operating principle is that the suspension controller controls the opening of the CDC shock absorber's solenoid valve, changing the throttling area to achieve oil flow in the working chamber. This in turn controls the CDC shock absorber's damping force, ensuring the vehicle maintains a stable posture on bumpy roads. However, this approach does not fully consider the impact of shock absorber damping adjustment on abnormal noise.

[0068] Step S20, when the characteristic information indicates that there is a road ahead that is prone to abnormal shock absorber noise, obtaining driving state parameters of the vehicle, wherein the driving state parameters include current vehicle speed, acceleration, and steering wheel angle;

[0069] In a specific implementation, the vehicle's driving state is acquired, including information such as vehicle speed and acceleration. The vehicle controller unit (VCU) obtains signals such as the vehicle's current speed, acceleration, and steering wheel angle to identify the driver's intent and predict the vehicle's motion state. If the vehicle's acceleration is less than or equal to a preset acceleration threshold, and the steering wheel angle is less than or equal to a preset steering wheel angle threshold, step S30 is executed.

[0070] Step S30, when the acceleration does not exceed the preset acceleration threshold and the steering wheel angle does not exceed the preset angle threshold, querying the shock absorber abnormal noise suppression strategy table based on the road surface characteristic information and the current vehicle speed to determine the operating current of the shock absorber;

[0071] In a specific implementation, based on the characteristic information of the road surface prone to abnormal noise and the driving status of the vehicle, a pre-set shock absorber abnormal noise suppression strategy table is queried to determine the operating current of the CDC shock absorber.

[0072] The damper squeak suppression activation threshold is calculated using the formula S = V0 + 0.5 × a × t2, where S is the distance between the drive wheel and the noise-prone surface when the damper squeak suppression strategy is activated, V0 is the vehicle's current speed, a is the vehicle's current acceleration, and t is the system response time (typically around 10ms) from the time the damper squeak suppression strategy is activated to the time the CDC executes the strategy. A camera or lidar detects the distance between the drive wheel and the noise-prone surface. When the distance is less than the set threshold, the damper squeak suppression strategy is activated.

[0073] It should be noted that the mechanism of shock absorber abnormal noise is as follows: the reciprocating vibration of the shock absorber piston rod is transmitted to the shock absorber mounting point through the bushing on the shock absorber, causing the wheel cover and other body panels to vibrate. The body panel vibration radiates noise, generating shock absorber abnormal noise in the car. When the status of the vehicle components is determined, the size of the CDC shock absorber abnormal noise is uniquely determined by the vibration of the shock absorber piston rod, and the vibration of the shock absorber piston rod is determined by the shock absorber damping. The CDC shock absorber damping force curve is a curve that changes with the vibration speed of the shock absorber piston rod, such as Figure 4As shown in the figure, when the current of the CDC shock absorber is constant, the damping force of the CDC shock absorber decreases as the vibration velocity of the shock absorber piston rod decreases. Under the same shock absorber piston rod vibration, the damping force of the CDC shock absorber decreases as the current decreases. The vibration velocity of the shock absorber piston rod is determined by the road surface characteristics (affecting the displacement of the shock absorber piston rod vibration) and the vehicle speed (affecting the vibration frequency of the shock absorber piston rod). During the research and development stage, with the goal of no abnormal noise from the shock absorber, through actual vehicle calibration, the correspondence between the shock absorber operating current and the road surface characteristics and vehicle speed can be obtained, that is, the shock absorber abnormal noise suppression strategy table, which is pre-stored in the vehicle control unit. The CDC shock absorber abnormal noise suppression strategy is to select a reasonable CDC shock absorber current based on the road surface characteristics and vehicle speed to ensure that the vehicle has no abnormal noise from the shock absorber.

[0074] It should be understood that if the vehicle acceleration is greater than the preset acceleration threshold or the steering wheel angle is greater than the preset steering wheel angle threshold, it means that the vehicle is being driven aggressively, and priority is given to ensuring the vehicle's handling stability. The vehicle travels in its current state without adjusting the shock absorber's operating current.

[0075] Step S40: adjusting the damping force of the shock absorber based on the operating current to suppress abnormal noise of the shock absorber.

[0076] In a specific implementation, the operation of the CDC shock absorber is controlled according to the operating current of the CDC shock absorber determined in S30 , thereby suppressing abnormal noise of the shock absorber during the driving of the vehicle.

[0077] It should be noted that the specific steps for actual vehicle calibration for different types of noise-prone road surfaces are as follows:

[0078] Step C1: Detect the interior noise and shock absorber vibration signals when the vehicle is driving on a road prone to abnormal noise, and compare the interior noise with a preset interior noise target value; if the interior noise value is greater than the interior noise target value, and the time when the shock absorber abnormal noise occurs coincides with the time when the shock absorber vibrates, execute step C2; if the interior noise value is less than the interior noise target value, the calibration is completed.

[0079] Among them, the specific procedures for CDC shock absorber abnormal noise test diagnosis are as follows:

[0080] Measurement point arrangement: A three-axis acceleration sensor is arranged at the upper end of the shock absorber piston rod to collect the shock absorber vibration signal; a microphone is arranged at the outer ear position of the vehicle occupant to collect the noise signal inside the vehicle.

[0081] Test conditions: The vehicle is driven on cement grooved roads, jointed roads, bad roads and other roads prone to abnormal noises to test the shock absorber vibration and in-vehicle noise.

[0082] Shock absorber noise diagnosis: Spectral analysis is performed on the shock absorber vibration signal and the interior noise signal. The interior noise and shock absorber vibration are replayed. If the occurrence of the interior noise coincides with the shock absorber vibration, the noise is determined to be caused by the shock absorber. Through filtered playback, the frequency range of the shock absorber noise is determined and the noise level within this frequency range (referred to as interior noise) is calculated.

[0083] Step C2: The vehicle is traveling at 5 km / h on a road prone to abnormal noise. The CDC shock absorber control unit sets the operating current. Starting from the maximum allowable CDC shock absorber operating current, the current is reduced in steps. The interior noise level is monitored until the interior noise level is ≤ the target interior noise level. The operating current at this point is recorded as the target current value for the vehicle traveling at 5 km / h. The target interior noise level is the maximum noise level without abnormal shock absorber noise.

[0084] Road surfaces prone to abnormal noise are typically bumpy surfaces such as speed bumps, grooved concrete roads, jointed roads, and potholes. To ensure vehicle stability, reduce body sway, and maintain tire grip, the shock absorber damping force is set high, which can easily cause abnormal shock absorber noise. The target current value determined using the above method is the maximum current value that meets the target in-vehicle noise level.

[0085] Step C3: Increase the vehicle speed in steps of 5 km / h, repeat step C3, and record the target operating current value of the CDC shock absorber corresponding to each vehicle speed when the vehicle is on a road surface prone to abnormal noise.

[0086] Step C4: Change the road surface prone to abnormal noise and repeat S31-S33 until all road surfaces prone to abnormal noise are calibrated. Record the target operating current value of the CDC shock absorber corresponding to each vehicle speed when the vehicle is driving on various road surfaces prone to abnormal noise.

[0087] Step C5: The target operating current values of the CDC shock absorber corresponding to each vehicle speed when the vehicle is driving on all roads prone to abnormal noise are obtained and summarized into a table showing the relationship between the CDC shock absorber operating current, road surface characteristics, and vehicle speed, which is the CDC shock absorber abnormal noise suppression strategy.

[0088] Furthermore, step S40 includes:

[0089] Based on the mapping relationship between the current vehicle speed and the operating current stored in the shock absorber abnormal noise suppression strategy table, the shock absorber's operating current is adjusted in real time so that the damping force of the shock absorber decreases as the operating current decreases, thereby suppressing abnormal noise inside the vehicle. Among them, the adjustment process of the operating current is dynamically matched with the vehicle's driving state. When the vehicle is driving on a road surface prone to abnormal noise, the adjustment amplitude of the operating current is dynamically corrected based on the real-time feedback of the road surface characteristics and the current vehicle speed.

[0090] It should be noted that current adjustment needs to be synchronized with the vehicle's driving status (such as speed and acceleration) in real time.

[0091] Road surface characteristic information: such as road bump density (number of potholes / meter) and type (speed bump height, groove depth).

[0092] The higher the vehicle speed, the higher the vibration frequency of the shock absorber piston rod, requiring a faster current response.

[0093] Furthermore, when the acceleration exceeds a preset acceleration threshold or the steering wheel angle exceeds a preset angle threshold, the shock absorber abnormal noise suppression strategy is suspended until the driving state parameter recovers to within the preset threshold, and then the suppression strategy is reactivated.

[0094] It should be noted that in intense driving scenarios, priority is given to ensuring vehicle handling stability, suspending the abnormal noise suppression strategy and restarting it after the status is restored.

[0095] This embodiment provides a method for suppressing shock absorber noise based on road surface pre-targeting. This method, while driving, uses the vehicle's environmental perception system to pre-identify road surfaces prone to noise. Based on road surface information and vehicle status, the CDC shock absorber's operating current is pre-determined to adjust the shock absorber's damping force, thereby preventing noise from occurring. This eliminates the need for hardware modifications, achieving zero-cost improvements to the shock absorber's noise problem, significantly shortening the R&D cycle and reducing development costs. Existing technical solutions optimize shock absorber noise through structural modifications, making it difficult to balance handling stability and NVH performance. The technical solution provided by the present invention, however, eliminates noise from the shock absorber through a control strategy, resulting in a superior driving experience.

[0096] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above embodiment 1 can be referred to the above introduction and will not be described in detail later. Figure 5 Before the step S30 of querying the shock absorber abnormal noise suppression strategy table, the process further includes steps S301 to S303:

[0097] Step S301, when the road surface is prone to abnormal shock absorber noise, the vehicle speed is increased by a first preset step size, and the operating current of the shock absorber is decreased by a second preset step size;

[0098] It should be noted that the first preset step size can be calibrated, such as 5 km / h, and the vehicle speed can be gradually increased to cover different working conditions.

[0099] The second preset step size can be calibrated, for example, to gradually reduce the operating current by 5% of the maximum allowable current of the shock absorber.

[0100] Step S302: collecting the vehicle interior noise signal and the shock absorber vibration signal in real time, performing spectrum analysis on the noise signal and the shock absorber vibration signal, and obtaining analysis results;

[0101] It should be noted that spectrum analysis is used to diagnose the source of abnormal noise and verify the effect of current adjustment.

[0102] In a feasible implementation, step S302 may include steps A21 to A23:

[0103] Step A21: Separate the abnormal sound frequency band of the noise signal through filtering and playback technology;

[0104] In the specific implementation, a bandpass filter (180Hz to 380Hz) is used to extract the abnormal sound frequency band in the noise signal, and the shock absorber vibration signal is filtered in the same frequency band to ensure the consistency of the analysis range and eliminate the interference of non-abnormal noise (such as wind noise and tire noise).

[0105] Step A22: Align the abnormal sound frequency band with the frequency band of the shock absorber vibration signal in the time domain;

[0106] In the specific implementation, the time axis of the noise signal and the vibration signal are adjusted to ensure that the two are synchronized. Among them, the abnormal noise is transmitted to the car body by the vibration of the shock absorber, and the causal relationship of the signals must be consistent.

[0107] Step A23: When the amplitude changes of the noise signal and the vibration signal of the shock absorber are consistent, determine that the current operating current is an effective suppression parameter.

[0108] In the specific implementation, the time axis of the noise signal and the vibration signal are adjusted to ensure that the two are synchronized. Among them, the abnormal noise is transmitted to the car body by the vibration of the shock absorber, and the causal relationship of the signals must be consistent.

[0109] Step S303 , when the analysis result shows that the noise signal is less than or equal to the preset target value and the amplitude changes of the noise signal and the shock absorber vibration signal are synchronized within the preset frequency band, the shock absorber operating current corresponding to the current vehicle speed is recorded and the shock absorber abnormal noise suppression strategy table is determined.

[0110] It should be noted that the shock absorber abnormal noise suppression strategy table establishes a mapping relationship between vehicle speed, current and abnormal noise suppression effect based on calibration data.

[0111] In a feasible implementation, step S303 may include steps A31 to A33:

[0112] Step A31: Align the noise signal and the shock absorber vibration signal in the time domain to ensure that their time axes are consistent;

[0113] In the specific implementation, the time axes of the noise and vibration signals are aligned again to ensure data reliability and avoid misjudgment due to signal acquisition delays.

[0114] Step A32: extracting a noise signal amplitude sequence and a vibration signal amplitude sequence within a preset frequency band;

[0115] In a specific implementation, an amplitude sequence in the frequency band of 180 Hz to 380 Hz is extracted from the noise signal, and an amplitude sequence in the same frequency band is extracted from the vibration signal.

[0116] Step A33: Determine the correlation coefficient between the noise signal amplitude sequence and the vibration signal amplitude sequence. When the correlation coefficient is greater than a preset value, it is determined that the amplitude changes are synchronized.

[0117] In the specific implementation, the Pearson correlation coefficient formula can be used to calculate the linear correlation of the two amplitude sequences. If the correlation coefficient r>0.8, it is determined that the amplitude changes are synchronized (strong correlation). When the noise value inside the vehicle is ≤ the preset target value (such as 60dB) and the correlation coefficient meets the standard, the working current corresponding to the current vehicle speed is recorded.

[0118] Furthermore, a strategy table may be generated to store mapping relationships between different vehicle speeds, road surface types, and optimal operating currents.

[0119] This embodiment provides a shock absorber abnormal noise suppression method based on road preview. It uses filter playback technology to separate the abnormal noise frequency band to avoid interference from other noises, ensures signal causality through time domain alignment, and quantifies synchronization through correlation coefficients. It replaces traditional subjective judgment to improve diagnostic accuracy and avoid human experience errors. It also covers the entire vehicle speed range and adapts to different road conditions through system calibration with increasing / decreasing step size.

[0120] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the shock absorber abnormal noise suppression method based on road surface pre-aiming of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0121] This application also provides a device for suppressing abnormal noise of shock absorber based on road surface preview, please refer to Figure 6 The shock absorber abnormal noise suppression device based on road surface pre-aiming includes:

[0122] The first acquisition module 10 is used to acquire characteristic information of the road surface in front of the vehicle in real time;

[0123] The second acquisition module 20 is configured to acquire driving state parameters of the vehicle when the characteristic information indicates that there is a road ahead where shock absorber noise is likely to occur, wherein the driving state parameters include the current vehicle speed, acceleration, and steering wheel angle;

[0124] a query module 30 for querying a shock absorber abnormal noise suppression strategy table based on road surface characteristic information and current vehicle speed to determine an operating current of the shock absorber when the acceleration does not exceed a preset acceleration threshold and the steering wheel angle does not exceed a preset angle threshold;

[0125] The control module 40 is configured to adjust the damping force of the shock absorber based on the operating current to suppress abnormal noise of the shock absorber.

[0126] The road surface pre-targeting-based shock absorber noise suppression device provided in this application utilizes the road surface pre-targeting-based shock absorber noise suppression method described in the aforementioned embodiment to address the technical issue of excessive noise from vehicle shock absorbers. Compared to the prior art, the road surface pre-targeting-based shock absorber noise suppression device provided in this application offers the same beneficial effects as the road surface pre-targeting-based shock absorber noise suppression method described in the aforementioned embodiment. Other technical features of the road surface pre-targeting-based shock absorber noise suppression device are the same as those disclosed in the aforementioned embodiment and are not further elaborated here.

[0127] In one embodiment, the first acquisition module 10 is further configured to recognize a road surface image of the road ahead of the vehicle;

[0128] Matching the road surface image with the pre-stored road surface feature classification model to obtain a matching result;

[0129] When the matching result shows that the road ahead of the vehicle is a speed bump, a cement grooved road or a pothole road, the characteristic information is determined to be that there is a road ahead that is prone to abnormal noise from the shock absorber.

[0130] In one embodiment, the query module 30 is further configured to increase the vehicle speed by a first preset step size and decrease the operating current of the shock absorber by a second preset step size when the road surface is prone to abnormal shock absorber noise;

[0131] Collect the noise signal and shock absorber vibration signal in the vehicle in real time, perform spectrum analysis on the noise signal and shock absorber vibration signal, and obtain the analysis results;

[0132] When the analysis result shows that the noise signal is less than or equal to the preset target value, and the amplitude changes of the noise signal and the shock absorber vibration signal are synchronized within the preset frequency band, the shock absorber operating current corresponding to the current vehicle speed is recorded and the shock absorber abnormal noise suppression strategy table is determined.

[0133] In one embodiment, the query module 30 is further configured to perform time domain alignment between the frequency band of the abnormal sound and the frequency band of the vibration signal of the shock absorber;

[0134] When the amplitude changes of the noise signal and the vibration signal of the shock absorber are consistent, the current working current is determined to be an effective suppression parameter.

[0135] In one embodiment, the control module 40 is further used to adjust the operating current of the shock absorber in real time according to the mapping relationship between the current vehicle speed and the operating current stored in the shock absorber abnormal noise suppression strategy table, so that the damping force of the shock absorber decreases as the operating current decreases, so as to suppress abnormal noise in the vehicle. The adjustment process of the operating current is dynamically matched with the vehicle driving state. When the vehicle is driving on a road surface prone to abnormal noise, the adjustment amplitude of the operating current is dynamically corrected based on the real-time feedback of the road surface characteristic information and the current vehicle speed.

[0136] In one embodiment, the query module 30 is further configured to perform time domain alignment on the noise signal and the shock absorber vibration signal to ensure that their time axes are consistent;

[0137] Extracting the noise signal amplitude sequence and the vibration signal amplitude sequence within a preset frequency band;

[0138] The correlation coefficient between the noise signal amplitude sequence and the vibration signal amplitude sequence is determined, and when the correlation coefficient is greater than a preset value, it is determined that the amplitude changes are synchronized.

[0139] In one embodiment, the control module 40 is further configured to suspend the shock absorber abnormal noise suppression strategy when the acceleration exceeds a preset acceleration threshold or the steering wheel angle exceeds a preset angle threshold, and to re-enable the suppression strategy when the driving state parameters recover to a value below the preset threshold.

[0140] The present application provides a device for suppressing abnormal noise of a shock absorber based on road surface preview. The device for suppressing abnormal noise of a shock absorber based on road surface preview includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method for suppressing abnormal noise of a shock absorber based on road surface preview in the above-mentioned embodiment 1.

[0141] Reference below Figure 7 , which shows a schematic structural diagram of a shock absorber noise suppression device based on road surface preview suitable for implementing an embodiment of the present application. The shock absorber noise suppression device based on road surface preview in the embodiment of the present application can include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (such as in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 7The shock absorber abnormal noise suppression device based on road surface pre-aiming shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0142] like Figure 7 As shown, the road surface preview-based shock absorber noise suppression device may include a processing device 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes based on programs stored in a read-only memory (ROM) 1002 or programs loaded from a storage device 1003 into a random access memory (RAM) 1004. RAM 1004 also stores various programs and data required for the operation of the road surface preview-based shock absorber noise suppression device. Processing device 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems may be connected to the I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, a magnetic tape, hard disk, etc.; and communication devices 1009. Communication devices 1009 may allow the road surface pre-targeting-based shock absorber squeak and rattle suppression device to communicate wirelessly or wired with other devices to exchange data. While the figures illustrate a road surface pre-targeting-based shock absorber squeak and rattle suppression device with various systems, it should be understood that implementation or presence of all of the illustrated systems is not required. More or fewer systems may alternatively be implemented or present.

[0143] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0144] The road surface pre-targeting-based shock absorber noise suppression device provided in this application utilizes the road surface pre-targeting-based shock absorber noise suppression method described in the aforementioned embodiment to address the technical issue of excessive noise from vehicle shock absorbers. Compared to the prior art, the road surface pre-targeting-based shock absorber noise suppression device provided in this application offers the same beneficial effects as the road surface pre-targeting-based shock absorber noise suppression device method described in the aforementioned embodiment. Other technical features of this road surface pre-targeting-based shock absorber noise suppression device are the same as those disclosed in the aforementioned embodiment and are not further elaborated here.

[0145] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0146] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0147] The present application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, and the computer-readable program instructions are used to execute the shock absorber abnormal noise suppression method based on road surface preview in the above embodiment.

[0148] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0149] The computer-readable storage medium may be included in the shock absorber noise suppression device based on road surface preview, or may exist independently without being assembled into the shock absorber noise suppression device based on road surface preview.

[0150] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the shock absorber abnormal noise suppression device based on road surface preview, the shock absorber abnormal noise suppression device based on road surface preview: obtains characteristic information of the road surface in front of the vehicle in real time; when the characteristic information indicates that there is a road surface in front that is prone to shock absorber abnormal noise, obtains the vehicle's driving state parameters, wherein the driving state parameters include the current vehicle speed, acceleration and steering wheel angle; when the acceleration does not exceed the preset acceleration threshold and the steering wheel angle does not exceed the preset angle threshold, based on the road surface characteristic information and the current vehicle speed, queries the shock absorber abnormal noise suppression strategy table to determine the operating current of the shock absorber; and adjusts the damping force of the shock absorber based on the operating current to suppress the shock absorber abnormal noise.

[0151] Computer program code for performing the operations of the present application may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages such as Java, Smalltalk, C++, and conventional procedural programming languages such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0152] The flow charts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, program segment or a part of code, and the module, program segment or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented by a dedicated hardware-based system that performs the specified function or operation, or can be implemented by a combination of dedicated hardware and computer instructions.

[0153] The modules described in the embodiments of the present application may be implemented in software or hardware, wherein the name of a module does not necessarily limit the unit itself.

[0154] The computer-readable storage medium provided in this application stores computer-readable program instructions (i.e., a computer program) for executing the aforementioned road surface preview-based shock absorber noise suppression method. This computer-readable storage medium can address the technical issue of excessive noise in vehicle shock absorbers. Compared to the prior art, the beneficial effects of the computer-readable storage medium provided in this application are similar to those of the road surface preview-based shock absorber noise suppression method provided in the aforementioned embodiments, and are not further elaborated here.

[0155] The present application also provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the above-mentioned method for suppressing abnormal noise of a shock absorber based on road surface preview.

[0156] The computer program product provided in this application can address the technical issue of excessive noise from vehicle shock absorbers. Compared to existing technologies, the computer program product provided in this application offers the same beneficial effects as the shock absorber noise suppression method based on road surface preview provided in the aforementioned embodiment, and will not be further elaborated here.

[0157] The above description is only part of the embodiments of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for suppressing abnormal noise of shock absorber based on road surface preview, characterized in that: The shock absorber abnormal noise suppression method based on road surface preview includes: Obtain characteristic information of the road ahead of the vehicle in real time; When the characteristic information indicates that there is a road surface ahead where shock absorber abnormal noise is likely to occur, obtaining driving state parameters of the vehicle, wherein the driving state parameters include current vehicle speed, acceleration, and steering wheel angle; When the acceleration does not exceed a preset acceleration threshold and the steering wheel angle does not exceed a preset angle threshold, querying a shock absorber abnormal noise suppression strategy table based on the road feature information and the current vehicle speed to determine an operating current of the shock absorber; The damping force of the shock absorber is adjusted based on the operating current to suppress abnormal sound of the shock absorber.

2. The method for suppressing abnormal noise of shock absorber based on road surface preview according to claim 1, characterized in that: The step of acquiring characteristic information of the road surface in front of the vehicle in real time includes: Recognizing a road surface image of the road ahead of the vehicle; Matching the road surface image with a pre-stored road surface feature classification model to obtain a matching result; When the matching result indicates that the road ahead of the vehicle is a speed bump, a cement grooved road, or a pothole-prone road, it is determined that the characteristic information indicates that there is a road ahead that is prone to abnormal noise from the shock absorber.

3. The method for suppressing abnormal noise of shock absorber based on road surface preview according to claim 1, characterized in that: Before the step of querying the shock absorber abnormal noise suppression strategy table, the method further includes: When the vehicle is on a road surface prone to abnormal noise from the shock absorber, the vehicle speed is increased by a first preset step length, and the operating current of the shock absorber is decreased by a second preset step length; collecting a noise signal and a vibration signal of a shock absorber in a vehicle in real time, performing spectrum analysis on the noise signal and the vibration signal of the shock absorber, and obtaining an analysis result; When the analysis result shows that the noise signal is less than or equal to a preset target value and the amplitude changes of the noise signal and the shock absorber vibration signal are synchronized within a preset frequency band, the shock absorber operating current corresponding to the current vehicle speed is recorded and a shock absorber abnormal noise suppression strategy table is determined.

4. The method for suppressing abnormal noise of shock absorber based on road surface preview according to claim 3, characterized in that: The step of performing spectrum analysis on the noise signal and the vibration signal of the shock absorber comprises: Separate the abnormal sound frequency band of the noise signal by filtering and replaying technology; Aligning the abnormal sound frequency band with the frequency band of the vibration signal of the shock absorber in the time domain; When the amplitude changes of the noise signal and the vibration signal of the shock absorber are consistent, the current operating current is determined to be an effective suppression parameter.

5. The method for suppressing abnormal noise of shock absorber based on road surface preview according to claim 1, characterized in that: The step of adjusting the damping force of the shock absorber based on the operating current to suppress abnormal noise of the shock absorber includes: According to the mapping relationship between the current vehicle speed and the operating current stored in the shock absorber abnormal noise suppression strategy table, the operating current of the shock absorber is adjusted in real time so that the damping force of the shock absorber decreases as the operating current decreases, so as to suppress abnormal noise in the vehicle. The adjustment process of the operating current is dynamically matched with the vehicle driving state. When the vehicle is driving on a road surface prone to abnormal noise, the adjustment amplitude of the operating current is dynamically corrected based on the real-time feedback of the road surface characteristic information and the current vehicle speed.

6. The method for suppressing abnormal noise of shock absorber based on road surface preview according to claim 3, characterized in that: The step of determining whether the amplitude changes of the noise signal and the vibration signal of the shock absorber within the preset frequency band are synchronized comprises: Performing time domain alignment on the noise signal and the shock absorber vibration signal to ensure that their time axes are consistent; Extracting the noise signal amplitude sequence and the vibration signal amplitude sequence within a preset frequency band; A correlation coefficient between the noise signal amplitude sequence and the vibration signal amplitude sequence is determined, and when the correlation coefficient is greater than a preset value, it is determined that the amplitude changes are synchronized.

7. The method for suppressing abnormal noise of shock absorber based on road surface preview according to claim 1, characterized in that: The method further comprises: When the acceleration exceeds a preset acceleration threshold or the steering wheel angle exceeds a preset angle threshold, the shock absorber abnormal noise suppression strategy is suspended until the driving state parameter recovers to not exceed the preset threshold, and then the suppression strategy is reactivated.

8. A shock absorber abnormal noise suppression device based on road surface preview, characterized in that: The device comprises: The first acquisition module is used to acquire characteristic information of the road surface in front of the vehicle in real time; a second acquisition module, configured to acquire driving state parameters of the vehicle when the characteristic information indicates that there is a road surface ahead that is prone to abnormal shock absorber noise, wherein the driving state parameters include current vehicle speed, acceleration, and steering wheel angle; a query module, configured to query a shock absorber abnormal noise suppression strategy table based on the road surface characteristic information and the current vehicle speed to determine an operating current of the shock absorber when the acceleration does not exceed a preset acceleration threshold and the steering wheel angle does not exceed a preset angle threshold; A control module is configured to adjust the damping force of the shock absorber based on the operating current to suppress abnormal noise of the shock absorber.

9. A shock absorber abnormal noise suppression device based on road surface preview, characterized in that: The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the shock absorber abnormal noise suppression method based on road surface preview according to any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the shock absorber abnormal noise suppression method based on road surface preview are implemented as described in any one of claims 1 to 7.

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