Road noise control method, device, equipment and storage medium based on controlling tailgate support rod

Abstract

This application discloses a road noise control method, apparatus, device, and storage medium based on tailgate strut control. This method relates to the field of automotive NVH technology and includes the following steps: obtaining vibration accelerations of the tailgate in different directions as captured by a preset sensor; calculating target vibration accelerations based on the vibration accelerations in different directions; obtaining a control current based on the target vibration acceleration and a preset vibration acceleration-current mapping table; and adjusting the motion parameters of the vehicle's tailgate strut based on the control current to achieve tailgate strut road noise control. By collecting tailgate vibration data, calculating the target vibration acceleration, and dynamically adjusting the tailgate strut motion parameters based on the preset vibration acceleration-current mapping table, the method effectively reduces in-vehicle noise caused by road unevenness.

Description

Technical Field

[0001] The present application relates to the field of automotive NVH technology, and in particular to a road noise control method, device, equipment and storage medium based on controlling a tailgate support rod. Background Art

[0002] In recent years, China has seen rapid growth in electric vehicles. However, due to the lack of engine noise shielding, low-frequency road noise has become a challenge in controlling NVH (noise, vibration, and harshness). When a vehicle travels on rough or uneven roads, road excitation is transmitted through the tires to the suspension, and then through the suspension to the upper body sheet metal, causing it to vibrate and generate noise. The typical frequency range for road noise is 20Hz-500Hz, with the 20Hz-50Hz range being called road noise, which is easily perceived by drivers and passengers, especially in SUVs.

[0003] Existing solutions generally shift the road excitation frequency by changing the tailgate's constrained modal frequency. The tailgate is generally connected to the vehicle body via hinges, latches, buffer blocks, limit blocks, sealing strips, and struts, and the tailgate's constrained modal is strongly correlated with these connectors. Changing the property parameters of any one of the connectors can change the tailgate's rigid body mode, but in actual engineering, these connector property parameters will affect related performance such as tailgate dimensional deviation, durability, cost, and weight. Therefore, changing the tailgate's rigid body mode by changing the physical properties of the connector is difficult to implement. Monitoring the microphone on the headrest and the vehicle speed inside the vehicle and identifying the frequency and amplitude of low-frequency drum noise based on the microphone signal will be affected by objective factors such as atmospheric temperature and humidity, resulting in distortion of the collected noise signal, which in turn affects the efficiency of controlling road noise.

[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 road noise control method, device, equipment and storage medium based on controlling the tailgate support rod, aiming to control the technical problem of road noise caused by low-frequency road noise when an electric vehicle is driving on rough roads.

[0006] To achieve the above objectives, the present application proposes a road noise control method based on controlling a tailgate support rod, the method comprising:

[0007] Obtain the vibration acceleration of the tailgate in different directions collected by the preset sensor;

[0008] Calculating target vibration acceleration according to the vibration accelerations in different directions;

[0009] Obtaining a control current according to the target vibration acceleration and a preset vibration acceleration-current mapping table;

[0010] The motion parameters of the tailgate support rod of the vehicle are adjusted according to the control current to complete the road noise control of the tailgate support rod.

[0011] In one embodiment, before the step of obtaining the vibration acceleration of the tailgate in different directions collected by the preset sensor, the method further includes:

[0012] Get the vehicle's speed and tailgate status;

[0013] determining whether the speed is greater than a first preset speed, and obtaining a first determination result when the speed is greater than the first preset speed;

[0014] determining whether the tailgate of the vehicle is in a closed state, and obtaining a second determination result when the tailgate of the vehicle is in a closed state;

[0015] When the first judgment result and the second judgment result are simultaneously met, the road noise detection condition is met;

[0016] The obtaining of the vibration acceleration of the tailgate in different directions collected by the preset sensor further includes:

[0017] When the judgment result is that the road noise detection condition is met, the vibration acceleration of the tailgate in different directions collected by the preset sensor is obtained.

[0018] In one embodiment, the step of obtaining the vibration acceleration of the tailgate in different directions collected by a preset sensor includes:

[0019] Obtaining the tailgate vibration frequency collected by the preset sensor;

[0020] When the vibration frequency of the tailgate is within a preset vibration frequency range, the first acceleration in a first direction, the second acceleration in a second direction, and the third acceleration in a third direction of the tailgate are collected, where the first direction, the second direction, and the third direction are perpendicular to each other.

[0021] In one embodiment, the step of obtaining the control current according to the target vibration acceleration and a preset vibration acceleration-current mapping table includes:

[0022] Searching for the target vibration acceleration in the preset vibration acceleration-current mapping table to obtain an acceleration-current mapping relationship;

[0023] The control current is obtained according to the acceleration current mapping relationship.

[0024] In one embodiment, the step of adjusting the motion parameters of the tailgate stay of the vehicle according to the control current to complete the road noise control of the tailgate stay includes:

[0025] changing the output torque of the motor inside the tailgate support rod according to the control current;

[0026] changing a motion parameter of a tailgate stay of the vehicle according to the output torque;

[0027] changing a rigid body modal frequency of a tailgate of the vehicle according to a motion parameter of the tailgate support rod;

[0028] Obtain the vehicle's road excitation frequency;

[0029] Road noise control of the tailgate support rod is completed according to the tailgate rigid body modal frequency and the road surface excitation frequency.

[0030] In one embodiment, before the step of obtaining the control current according to the target vibration acceleration and the preset vibration acceleration-current mapping table, the method further includes:

[0031] acquiring a first velocity and a first vibration acceleration of the vehicle;

[0032] obtaining, according to the first speed and the first vibration acceleration, road noise of the vehicle at the first speed and the first vibration acceleration;

[0033] adjusting the control current according to the road noise, and recording the first speed, the first vibration acceleration, and the current control current when the road noise disappears;

[0034] When the recording is completed, the first speed is updated to obtain an updated first speed, the first vibration acceleration is updated according to the updated first speed, and the process returns to the step of obtaining the road noise of the vehicle under the first speed and the first vibration acceleration according to the first speed and the first vibration acceleration;

[0035] When the first speed is a second preset speed, recording is stopped to obtain the preset vibration acceleration-current mapping table.

[0036] In one embodiment, before the step of searching the target vibration acceleration in the preset vibration acceleration-current mapping table to obtain the acceleration-current mapping relationship, the step further includes:

[0037] Obtaining a vehicle speed, a first preset speed, and a second preset speed;

[0038] determining whether the speed is greater than the first preset speed and less than the second preset speed;

[0039] When the speed is greater than the first preset speed and less than the second preset speed, obtaining a third judgment result;

[0040] Determining whether the vibration acceleration has the acceleration-current mapping relationship;

[0041] When the vibration acceleration has the acceleration-current mapping relationship, obtaining a fourth judgment result;

[0042] When the third judgment result and the fourth judgment result are satisfied at the same time, the vibration acceleration is searched in the preset vibration acceleration-current mapping table.

[0043] In addition, to achieve the above-mentioned purpose, the present application also proposes a road noise control device based on controlling a tailgate support rod, the road noise control device based on controlling a tailgate support rod comprises:

[0044] An acquisition module is used to obtain the vibration acceleration of the tailgate in different directions collected by a preset sensor;

[0045] a calculation module, configured to calculate a target vibration acceleration according to the vibration accelerations in different directions;

[0046] An obtaining module, configured to obtain a control current according to the target vibration acceleration and a preset vibration acceleration-current mapping table;

[0047] The control module is used to adjust the motion parameters of the tailgate support rod of the vehicle according to the control current to complete the road noise control of the tailgate support rod.

[0048] In addition, to achieve the above-mentioned purpose, the present application also proposes a road noise control device based on controlling a tailgate strut, the device comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, the computer program being configured to implement the steps of the road noise control method based on controlling a tailgate strut as described above.

[0049] 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 road noise control method based on controlling the tailgate support rod as described above are implemented.

[0050] 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, the steps of the road noise control method based on controlling the tailgate support rod as described above are implemented.

[0051] One or more technical solutions proposed in this application have at least the following technical effects:

[0052] The vibration acceleration is calculated using the acceleration collected by a preset sensor, and a control current is obtained based on the vibration acceleration and a preset vibration acceleration-current mapping table. The restraining force of the vehicle's tailgate strut is changed by controlling the current, and the rigid-body modal frequency of the vehicle's tailgate is changed according to the restraining force of the tailgate strut. The road noise is controlled according to the rigid-body modal frequency of the tailgate, thereby achieving dynamic adjustment of the restraining force of the electric tailgate strut and controlling the coupling problem between the rigid-body modal of the tailgate and the road excitation frequency caused by the fixed restraining force. The vibration characteristics of the tailgate can be automatically optimized under different driving conditions without changing the vehicle's structural design or increasing additional hardware costs, effectively reducing the noise inside the vehicle caused by low-frequency road noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] 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.

[0054] 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.

[0055] Figure 1 A flowchart of a first embodiment of a road noise control method based on controlling a tailgate support rod is provided in this application;

[0056] Figure 2 A schematic structural diagram of a road noise control device provided in Example 1 of the road noise control method based on controlling a tailgate support rod of the present application;

[0057] Figure 3 This is a flowchart of a second embodiment of the road noise control method based on controlling the tailgate support rod of the present application;

[0058] Figure 4 A schematic flow chart of a road noise control method based on controlling a tailgate support rod provided in the second embodiment of the present application;

[0059] Figure 5 This is a schematic diagram showing the effect of the road noise control method based on controlling the tailgate support rod provided in the second embodiment of the present application;

[0060] Figure 6 This is a schematic diagram of the module structure of a road noise control device based on controlling a tailgate support rod according to an embodiment of the present application;

[0061] Figure 7 Schematic diagram of the device structure of the hardware operating environment involved in the road noise control method based on controlling the tailgate support rod in the embodiment of the present application.

[0062] Description of Figure Numbers:

[0063] A tailgate of a vehicle 1; a vibration sensor 2; an electric strut 3; and a controller 4.

[0064] 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

[0065] 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.

[0066] 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.

[0067] The main control scheme of the embodiment of the present application is: obtaining the vibration acceleration of the tailgate in different directions collected by a preset sensor;

[0068] Calculating target vibration acceleration according to the vibration accelerations in different directions;

[0069] Obtaining a control current according to the target vibration acceleration and a preset vibration acceleration-current mapping table;

[0070] The motion parameters of the tailgate support rod of the vehicle are adjusted according to the control current to complete the road noise control of the tailgate support rod.

[0071] In this embodiment, for ease of description, the following description is based on identifying a road noise control device based on controlling a tailgate stay as an execution subject.

[0072] The existing technology of changing the rigid body mode of the tailgate by changing the physical properties of the connecting parts is difficult to implement. However, by monitoring the microphone on the headrest and the vehicle speed, the frequency and amplitude of the low-frequency drum noise are identified based on the microphone signal. However, this will be affected by objective factors such as atmospheric temperature and humidity, resulting in distortion of the collected noise signal, which in turn affects the efficiency of controlling road noise.

[0073] The present application provides a control scheme, which calculates vibration acceleration through acceleration collected by a preset sensor, and then obtains a control current based on the vibration acceleration and a preset vibration acceleration-current mapping table. The restraining force of the vehicle's tailgate strut is changed by the control current, and the vehicle's tailgate rigid body modal frequency is changed according to the restraining force of the tailgate strut. The road noise is controlled according to the tailgate rigid body modal frequency, thereby achieving dynamic adjustment of the restraining force of the electric tailgate strut, controlling the coupling problem between the tailgate rigid body mode and the road excitation frequency caused by the fixed restraining force, and automatically optimizing the vibration characteristics of the tailgate under different driving conditions without changing the vehicle's structural design or increasing additional hardware costs, thereby effectively reducing the noise inside the vehicle caused by low-frequency road noise.

[0074] 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 implementing the aforementioned functions, such as a road noise control device for controlling a tailgate strut. This embodiment and the following embodiments will be described below using a road noise control device for controlling a tailgate strut as an example.

[0075] Based on this, the embodiment of the present application provides a road noise control method based on controlling the tailgate support rod, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the road noise control method based on controlling the tailgate support rod of the present application.

[0076] In this embodiment, the road noise control method based on controlling the tailgate support bar includes steps S10 to S40:

[0077] Step S10, obtaining the vibration acceleration of the tailgate in different directions collected by a preset sensor;

[0078] It should be noted that the pre-set sensors refer to sensors pre-set and installed on the vehicle's tailgate for road noise control. These sensors are specifically designed to collect vibration data. In this embodiment, the pre-set sensors represent vibration sensors. Compared to microphones, vibration sensors offer the advantages of strong signal immunity and low cost. Furthermore, since the vibration sensors are installed on the inner sheet metal surface of the tailgate, there is no need to modify the headrest structure, keeping the overall vehicle cost under control.

[0079] It's important to note that the first, second, and third accelerations refer to the acceleration values ​​of the tailgate measured by the sensor in three mutually perpendicular directions. Acceleration is a physical quantity that describes the change in an object's velocity. In this embodiment, it represents the vibration of the tailgate in different directions.

[0080] Reference Figure 2 , Figure 2 This is a schematic structural diagram of a road noise control device provided in Example 1 of the road noise control method based on controlling a tailgate support rod of the present application.

[0081] like Figure 2 As shown, the road noise control device includes: a tailgate 1 of a vehicle, a vibration sensor 2, an electric strut 3 and a controller 4.

[0082] Step S20, calculating a target vibration acceleration according to the vibration accelerations in different directions;

[0083] It should be noted that vibration acceleration is a physical quantity that describes the vibration characteristics of an object. It can reflect the dynamic characteristics of vibration. The magnitude of vibration acceleration is related to the frequency and amplitude of vibration and can be used to assess the potential impact of vibration on structures or mechanical components. The target vibration acceleration represents the total vibration acceleration of the vehicle, and the control current is derived based on the target vibration acceleration.

[0084] In addition, it should be noted that the vibration accelerations in different directions are divided into the first acceleration, the second acceleration and the third acceleration in the first direction, the second direction and the third direction.

[0085] It can be understood that after obtaining the first acceleration, the second acceleration, and the third acceleration, the vibration acceleration is calculated as follows:

[0086]

[0087] In the above formula 1, a x is the first acceleration, a y is the second acceleration, a z is the third acceleration.

[0088] Step S30, obtaining a control current according to the target vibration acceleration and a preset vibration acceleration-current mapping table;

[0089] It should be noted that the preset vibration acceleration-current mapping table is a predefined table or database that stores the correspondence between vibration acceleration and control current. In this embodiment, the preset vibration acceleration-current mapping table refers to a predefined table that can be used to map specific vibration acceleration values ​​to specific control current values ​​through completed testing and calibration processes.

[0090] It's important to note that the control current refers to the current supplied to the motor inside the power tailgate strut. Its magnitude determines the motor's output torque, which in turn affects the strut's restraining force on the tailgate. Controlling the current is a direct means of adjusting the rigid-body modal frequency of the tailgate.

[0091] Step S40 , adjusting the motion parameters of the tailgate strut of the vehicle according to the control current to complete road noise control of the tailgate strut.

[0092] It should be noted that the vehicle's tailgate support's motion parameters refer to the force exerted on the tailgate by the power tailgate support through movement within the specified range. This force limits the tailgate's vibration amplitude. The support's restraining force can be either a push or a pull, depending on whether the support is used to hold the tailgate open or assist in closing it. The magnitude of the restraining force directly affects the tailgate's vibration characteristics. Increasing the restraining force can reduce tailgate vibration, while reducing it may allow for greater vibration amplitude.

[0093] It's understandable that adjusting the tailgate support's restraining force can alter the tailgate's rigid-body modal frequency. By adjusting the tailgate's rigid-body modal frequency to avoid the primary frequency range of road excitation, the noise and vibration caused by resonance can be reduced, achieving road noise control.

[0094] In a feasible implementation manner, step S10 may include steps S01 to S05:

[0095] Step S01, obtaining the vehicle speed and the tailgate status of the vehicle;

[0096] It should be noted that the vehicle's tailgate status refers to whether the tailgate is open or closed, and can be detected by a tailgate position sensor or other mechanism. In this embodiment, the tailgate status includes two states: open and closed, indicating that the tailgate is open and closed, respectively. The vehicle's speed refers to the current vehicle speed, typically measured by the vehicle's speed sensor and expressed in kilometers per hour (km / h).

[0097] Step S02, determining whether the speed is greater than a first preset speed, and obtaining a first determination result when the speed is greater than the first preset speed;

[0098] It should be noted that the first preset speed is a predefined threshold used to determine whether road noise detection is required. In this embodiment, the first preset speed threshold is set to 10 km / h, indicating that road noise control will only be considered when the vehicle speed exceeds this value.

[0099] In addition, it should be noted that the first judgment result indicates that if the current vehicle speed is greater than the first preset speed, a positive judgment result can be obtained, indicating that there may be a road noise problem and further detection is required.

[0100] Step S03, determining whether the tailgate of the vehicle is in a closed state, and obtaining a second determination result when the tailgate of the vehicle is in a closed state;

[0101] It should be noted that the closed state refers to the tailgate being in the fully closed position with no gaps or misalignments.

[0102] In addition, it should be noted that the second judgment result indicates that if the tailgate is in the closed state, a second positive judgment result can be obtained, indicating that the tailgate is in a state suitable for road noise control.

[0103] Step S04: When both the first judgment result and the second judgment result are satisfied, the road noise detection condition is satisfied.

[0104] It is understood that when both the first and second judgment results are met, the road noise detection condition is satisfied when the vehicle speed exceeds a first preset speed and the tailgate is closed. Only when these two conditions are met are the conditions for initiating road noise detection and control considered to be met.

[0105] Step S05 : when the judgment result is that the road noise detection condition is met, obtaining the vibration acceleration of the tailgate in different directions collected by a preset sensor.

[0106] It is understandable that when the judgment result is that the road noise detection condition is met, obtaining the vibration acceleration of the tailgate in different directions collected by the preset sensor means that the vibration acceleration of the tailgate in different directions will be collected and the road noise control process will be started only when the conditions for starting road noise detection and control are met.

[0107] In a feasible implementation, step S10 may include steps S11 to S12:

[0108] Step S11, obtaining the tailgate vibration frequency collected by the preset sensor;

[0109] It should be noted that tailgate vibration frequency refers to the frequency of the reciprocating vibrations generated by the tailgate when subjected to excitation, such as the impact and vibration caused by uneven road surfaces during driving. This vibration frequency is generally related to the road conditions on which the vehicle is traveling, the structural characteristics and materials of the tailgate, and its connection to the vehicle body.

[0110] It is understandable that, when the judgment result is that the road noise detection condition is met, obtaining the tailgate vibration frequency collected by the preset sensor means starting to collect tailgate vibration frequency data from the preset sensor when the road noise detection condition is met.

[0111] Step S12: When the vibration frequency of the tailgate is within a preset vibration frequency range, the first acceleration in a first direction, the second acceleration in a second direction, and the third acceleration in a third direction of the tailgate are collected, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0112] It should be noted that the preset vibration frequency range is a vibration frequency interval defined in advance during design, which is used to determine which frequency range of vibration needs to be detected and analyzed. In this embodiment, the preset vibration frequency range is 20Hz to 50Hz, representing the low-frequency drum noise range.

[0113] In addition, it should be noted that the first direction, the second direction and the third direction refer to three independent directions perpendicular to each other in space, which in this embodiment represent the X, Y and Z axes, and are used to comprehensively capture the vibration of the tailgate in different directions.

[0114] It can be understood that the first acceleration a x is the vibration acceleration value of the tailgate in the x direction of the vehicle, a y is the vibration acceleration value of the tailgate in the y direction of the vehicle, a z is the vibration acceleration value of the tailgate in the z direction of the vehicle.

[0115] In a feasible implementation manner, step S30 may include steps S301 to S305 before step S30:

[0116] Step S301, obtaining a first speed and a first vibration acceleration of the vehicle;

[0117] It should be noted that the first speed refers to the initial speed of the vehicle during a specific test or calibration process, and the speed here usually starts from a low speed and gradually increases.

[0118] In addition, it should be noted that the first vibration acceleration represents an acceleration value of the tailgate vibration measured by the vibration sensor at a first speed.

[0119] Step S302: obtaining road noise of the vehicle at the first speed and the first vibration acceleration according to the first speed and the first vibration acceleration;

[0120] It should be noted that road noise refers to the noise caused by the vibration of the tailgate due to uneven road surface during vehicle driving.

[0121] It can be understood that obtaining the road noise of the vehicle at the first speed and the first vibration acceleration according to the first speed and the first vibration acceleration represents evaluating the road noise level generated by the vehicle under the current first speed and first vibration acceleration conditions.

[0122] Step S303: adjusting the control current according to the road noise, and recording the first speed, the first vibration acceleration, and the current control current when the road noise disappears;

[0123] It can be understood that, based on the measured road noise level, the control current of the motor inside the power tailgate strut is adjusted to change the tailgate's restraining force, thereby affecting the tailgate's vibration characteristics. When the road noise is reduced to an acceptable level or disappears, the current first velocity, first vibration acceleration, and corresponding control current are recorded to form an acceleration-current mapping relationship.

[0124] Step S304: When recording is completed, the first speed is updated to obtain an updated first speed, the first vibration acceleration is updated according to the updated first speed, and the process returns to the step of obtaining the vehicle road noise under the first speed and the first vibration acceleration according to the first speed and the first vibration acceleration;

[0125] It is understood that after recording the road noise and control current at the current speed, the vehicle speed will be gradually increased to test and calibrate the conditions at higher speeds. After the speed is updated, the road noise at the new speed is repeatedly evaluated and the control current is adjusted accordingly.

[0126] Step S305 : When the first speed is equal to a second preset speed, stop recording and obtain the preset vibration acceleration-current mapping table.

[0127] It should be noted that the second preset speed index is the maximum speed threshold of the calibration process. When the vehicle speed reaches this value, the calibration process ends.

[0128] It is understandable that when the first speed is the second preset speed, data collection will stop and a mapping table will be generated based on the recorded data. This mapping table will be used in the real-time control process to quickly find the appropriate control current based on the current speed and vibration acceleration.

[0129] In a specific embodiment, the preset vibration acceleration-current mapping table shown in Table 1 is calibrated. Table 1 lists the tailgate vibration signal a of the vehicle at different vehicle speeds. Rms And the corresponding calibration data of the strut motor current A.

[0130] The column headings of the table include vehicle speed v, tailgate vibration signal a Rms , and the strut motor current A. The vehicle speed is in kilometers per hour (km / h), the tailgate vibration signal is in meters per second squared (m / s2), and the strut motor current is in amperes (A).

[0131] The data in the table are arranged in increasing order of vehicle speed. Each row corresponds to the vibration signal and motor current value at a specific vehicle speed, starting from the initial vehicle speed v0 and increasing by nkm / h until the maximum vehicle speed v n+nk, each data point in the table represents the correspondence between the vibration signal and the motor current calibrated to suppress tailgate vibration at a specific vehicle speed. The tailgate vibration signal, that is, the target vibration acceleration, can be input to find the corresponding strut motor current. This strut motor current is used as the output and, after further processing, can achieve the effect of controlling road noise.

[0132] Table 1

[0133]

[0134] In the actual application scenario, the calibration is performed from the initial vehicle speed v0 of 10 km / h, and the vehicle speed v is increased by 10 km / h, that is, the vehicle speed v is 20 km / h, 30 km / h, 40 km / h until v = 100 km / h, and the tailgate vibration acceleration a at each vehicle speed is obtained. Rms , manually adjust the internal motor control current A of the strut until the drumming sound inside the car is completely acceptable at each vehicle speed, and finally write the corresponding strut motor control current A value into the preset vibration acceleration-current mapping table.

[0135] In a feasible implementation, step S40 may include steps S41 to S45:

[0136] Step S41, changing the output torque of the motor inside the tailgate support rod according to the control current;

[0137] It should be noted that the output torque refers to the torque generated by the motor inside the electric strut. It is a measure of the motor's rotational force and directly affects the force of the strut on the tailgate.

[0138] Step S42, changing the motion parameters of the tailgate support rod of the vehicle according to the output torque;

[0139] It can be understood that changing the restraining force of the tailgate support rod of the vehicle according to the output torque means that changing the output torque of the motor will correspondingly change the restraining force of the support rod on the tailgate, thereby adjusting the vibration characteristics of the tailgate.

[0140] Step S43, changing the rigid body modal frequency of the vehicle's tailgate according to the motion parameters of the tailgate support rod;

[0141] It's important to note that the rigid-body modal frequency of a vehicle's tailgate refers to the frequency at which the tailgate, as a whole, naturally vibrates without external restraints or damping. This frequency is an inherent vibration characteristic of the tailgate structure and is dependent on factors such as its material, shape, and mass distribution. The rigid-body modal frequency of the tailgate determines the frequency at which it responds to a specific vibration excitation. If the frequency of the road excitation couples with the rigid-body modal frequency of the tailgate, resonance can occur, leading to increased noise and vibration.

[0142] It is understandable that changing the rigid modal frequency of the vehicle's tailgate according to the restraining force of the tailgate stay means that the rigid modal frequency of the tailgate can be changed to avoid the main frequency of road excitation, thereby reducing vibration and noise.

[0143] Step S44, obtaining the road surface excitation frequency of the vehicle;

[0144] It should be noted that the road excitation frequency represents the frequency of periodic excitation of the vehicle structure caused by road irregularities during vehicle travel. In this embodiment, this frequency information needs to be monitored in real time or acquired in advance for comparison and adjustment with the rigid body modal frequency of the tailgate.

[0145] Step S45 , completing road noise control of the tailgate support rod according to the tailgate rigid body modal frequency and the road surface excitation frequency.

[0146] It is understood that the rigid body modal frequency of the tailgate is matched to the road excitation frequency to ensure that they do not resonate. If there is a risk of resonance, the vibration characteristics of the tailgate will be changed by adjusting the control current and output torque to control the road noise problem.

[0147] This embodiment controls the technical problem of low-frequency road noise caused by uneven road surfaces during vehicle driving by means of real-time monitoring of the vibration acceleration of the vehicle tailgate and dynamically adjusting the output torque of the motor inside the electric tailgate support rod, thereby achieving the beneficial effect of reducing noise inside the vehicle and improving ride comfort.

[0148] 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 3 After step S30, the road noise control method based on controlling the tailgate support rod further includes steps S31 to S32:

[0149] Step S31, searching the preset vibration acceleration-current mapping table for the target vibration acceleration to obtain an acceleration-current mapping relationship;

[0150] It should be noted that the acceleration-current mapping relationship refers to the correspondence between the vibration acceleration value and the control current value in the mapping table. The correspondence relationship can be used to determine how much current should be output to adjust the restraining force of the tailgate support rod.

[0151] It is understandable that, according to the vibration acceleration value collected in real time, the corresponding control current can be found in the preset vibration acceleration-current mapping table.

[0152] Step S32: Obtain the control current according to the acceleration current mapping relationship.

[0153] It is understandable that once the system finds the corresponding relationship in the mapping table, it will determine the specific value of the control current based on this relationship.

[0154] In a feasible implementation manner, step S31 may include steps S311 to S316 before step S31:

[0155] Step S311, obtaining the vehicle speed, the first preset speed, and the second preset speed;

[0156] It should be noted that the first preset speed is a predefined threshold value used to determine the minimum speed at which road noise control is to be considered, and the second preset speed is another predefined threshold value used to determine the maximum speed at which road noise control is to be stopped.

[0157] Step S312, determining whether the speed is greater than the first preset speed and less than the second preset speed;

[0158] It is understandable that determining whether the speed is greater than the first preset speed and less than the second preset speed means determining whether the subsequent road noise control process needs to be continued by determining whether the current vehicle speed is between two preset speed thresholds.

[0159] Step S313, when the speed is greater than the first preset speed and less than the second preset speed, obtaining a third judgment result;

[0160] It should be noted that the third judgment result indicates that if the vehicle speed is between the two thresholds, a positive judgment result is obtained. This third judgment result indicates that the vehicle speed is within the speed range requiring road noise control.

[0161] Step S314, determining whether the vibration acceleration has the acceleration-current mapping relationship;

[0162] It is understandable that it is necessary to determine whether the vibration acceleration has the acceleration-current mapping relationship through the vibration acceleration value collected in real time, which means that it is necessary to find out whether the vibration acceleration value of the vehicle has a corresponding control current value in the preset vibration acceleration-current mapping table.

[0163] Step S315, obtaining a fourth judgment result when the vibration acceleration has the acceleration-current mapping relationship;

[0164] It should be noted that the fourth judgment result indicates that if the vibration acceleration has a corresponding current value in the mapping table, a positive judgment result is obtained, indicating that this mapping relationship can be used to determine the control current.

[0165] Step S316 : When both the third judgment result and the fourth judgment result are satisfied, searching the preset vibration acceleration-current mapping table for the vibration acceleration.

[0166] It is understandable that if the vehicle speed is within a preset range and the vibration acceleration has a corresponding current value in the mapping table, the mapping table will be searched and this relationship will be used to determine the control current that should be output.

[0167] This embodiment dynamically monitors vehicle speed and tailgate vibration acceleration, searches for the corresponding control current based on a preset vibration acceleration-current mapping table, and determines whether the vehicle is within a preset speed threshold. The system then checks whether the collected vibration acceleration is present in the mapping table. If the conditions are met, the system determines and outputs an appropriate control current based on the mapping relationship to adjust the restraining force of the tailgate support bar, changing the rigid body modal frequency of the tailgate to avoid resonance with the road excitation frequency, effectively reducing interior noise. This process achieves intelligent control of road noise and improves ride comfort.

[0168] For example, in order to help understand the implementation process of the road noise control method based on controlling the tailgate support rod obtained by combining this embodiment with the above embodiment 1, please refer to Figure 4 , Figure 4 A simplified flowchart of a road noise control method based on controlling the tailgate support rod is provided. Specifically:

[0169] After the vehicle starts, the system will continuously detect whether the vehicle's speed v is within the preset minimum speed v0 and maximum speed v n +nk, and at the same time check whether the tailgate is in the closed state M=1. If the speed is within the range and the tailgate is closed, it will further determine whether the tailgate vibration acceleration value is within the calibration range of the Map. This Map is the preset vibration acceleration-current mapping table. Once it is confirmed that the vibration acceleration value is within the Map, the controller will adjust the tailgate vibration acceleration value according to the vibration acceleration value a Rms The map is searched to determine the appropriate control current A, which is then output to the motor of the electric strut. The restraining force of the strut on the tailgate is adjusted to dynamically avoid the road excitation frequency and control road noise.

[0170] Reference Figure 5 , Figure 5 A schematic diagram of the effect of a road noise control method based on controlling the tailgate support rod is provided. Figure 5As shown: The red line represents the vibration state of the vehicle tailgate when the road noise control based on controlling the tailgate strut is not used, while the green line represents the use of road noise control based on controlling the tailgate strut. By adjusting the output torque of the motor inside the electric strut in real time, the restraint force of the tailgate is changed, and then the rigid body modal frequency of the tailgate is adjusted, successfully avoiding the road excitation frequency and significantly reducing the drumming sound in the car.

[0171] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the road noise control method based on controlling the tailgate support rod of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0172] This application also provides a road noise control device based on controlling the tailgate support rod, please refer to Figure 6 , the road noise control device based on controlling the tailgate support rod includes:

[0173] An acquisition module 10 is used to acquire the vibration acceleration of the tailgate in different directions collected by a preset sensor;

[0174] A calculation module 20, configured to calculate a target vibration acceleration according to the vibration accelerations in different directions;

[0175] An obtaining module 30 is configured to obtain a control current according to the target vibration acceleration and a preset vibration acceleration-current mapping table;

[0176] The control module 40 is configured to adjust the motion parameters of the tailgate support rod of the vehicle according to the control current to achieve road noise control of the tailgate support rod.

[0177] The road noise control device based on tailgate strut control provided in this application, employing the road noise control method based on tailgate strut control described in the aforementioned embodiment, can address the technical issue of low-frequency road noise caused by electric vehicles traveling on rough roads. Compared to the prior art, the beneficial effects of the road noise control device based on tailgate strut control provided in this application are the same as those of the road noise control method based on tailgate strut control described in the aforementioned embodiment. Other technical features of the road noise control device based on tailgate strut control are the same as those disclosed in the aforementioned embodiment and are not further elaborated here.

[0178] The present application provides a road noise control device based on controlling a tailgate strut. The road noise control device based on controlling a tailgate strut 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 road noise control method based on controlling a tailgate strut in the above-mentioned embodiment 1.

[0179] Reference below Figure 7 , which shows a schematic structural diagram of a tailgate stay-controlled road noise control device suitable for implementing embodiments of the present application. The tailgate stay-controlled road noise control device in embodiments 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), and in-vehicle terminals (e.g., in-vehicle navigation terminals), as well as fixed terminals such as digital TVs and desktop computers. Figure 7 The road noise control device based on controlling the tailgate support rod is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0180] like Figure 7 As shown, the tailgate stay-based road noise control device may include a processing device 1001 (e.g., a central processing unit, 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 tailgate stay-based road noise control 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 I / O interface 1006: input device 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output device 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage device 1003 including, for example, a magnetic tape, hard disk, etc.; and communication device 1009. Communication device 1009 may allow the tailgate stay-based road noise control device to communicate with other devices wirelessly or by wire to exchange data. While the figure illustrates a tailgate stay-based road noise control device with various systems, it should be understood that implementation or presence of all illustrated systems is not required. More or fewer systems may alternatively be implemented or present.

[0181] 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.

[0182] The tailgate strut-based road noise control device provided in this application utilizes the tailgate strut-based road noise control method described in the aforementioned embodiment to address the technical issue of low-frequency road noise caused by electric vehicles traveling on rough roads. Compared to the prior art, the tailgate strut-based road noise control device provided in this application achieves the same beneficial effects as the tailgate strut-based road noise control method described in the aforementioned embodiment. Other technical features of this tailgate strut-based road noise control device are the same as those disclosed in the aforementioned embodiment and are not further elaborated here.

[0183] 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.

[0184] 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.

[0185] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, a computer program) stored thereon, wherein the computer-readable program instructions are used to execute the road noise control method based on controlling the tailgate support rod in the above embodiment.

[0186] 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.

[0187] The computer-readable storage medium may be included in the road noise control device based on controlling the tailgate stay, or may exist independently without being assembled into the road noise control device based on controlling the tailgate stay.

[0188] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by a road noise control device based on controlling a tailgate stay, the device is configured to: obtain vibration accelerations of the tailgate in different directions collected by a preset sensor;

[0189] Calculating target vibration acceleration according to the vibration accelerations in different directions;

[0190] Obtaining a control current according to the target vibration acceleration and a preset vibration acceleration-current mapping table;

[0191] The motion parameters of the tailgate support rod of the vehicle are adjusted according to the control current to complete the road noise control of the tailgate support rod.

[0192] 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).

[0193] 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.

[0194] 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.

[0195] The computer-readable storage medium provided in this application stores computer-readable program instructions (i.e., a computer program) for executing the aforementioned road noise control method based on controlling a tailgate strut. This computer-readable storage medium can address the technical issue of low-frequency road noise caused by electric vehicles traveling on rough roads. 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 noise control method based on controlling a tailgate strut provided in the aforementioned embodiment, and are not further elaborated here.

[0196] The present application also provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of the above-mentioned road noise control method based on controlling a tailgate support bar.

[0197] The computer program product provided in this application can address the technical issue of low-frequency road noise caused by electric vehicles traveling on rough roads. Compared to the prior art, the beneficial effects of the computer program product provided in this application are similar to those of the road noise control method based on controlling the tailgate strut provided in the aforementioned embodiment, and are not further elaborated here.

[0198] 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 road noise control method based on controlling the tailgate support rod, characterized in that: The method comprises: Obtain the vibration acceleration of the tailgate in different directions collected by the preset sensor; Calculating target vibration acceleration according to the vibration accelerations in different directions; Obtaining a control current according to the target vibration acceleration and a preset vibration acceleration-current mapping table; adjusting the motion parameters of the tailgate support rod of the vehicle according to the control current to achieve road noise control of the tailgate support rod; The step of obtaining the control current according to the target vibration acceleration and the preset vibration acceleration-current mapping table includes: Searching for the target vibration acceleration in the preset vibration acceleration-current mapping table to obtain an acceleration-current mapping relationship; Obtaining the control current according to the acceleration current mapping relationship; The step of adjusting the motion parameters of the tailgate support rod of the vehicle according to the control current to complete the road noise control of the tailgate support rod comprises: changing the output torque of the motor inside the tailgate support rod according to the control current; changing a motion parameter of a tailgate stay of the vehicle according to the output torque; changing a rigid body modal frequency of a tailgate of the vehicle according to a motion parameter of the tailgate support rod; Obtain the vehicle's road excitation frequency; Road noise control of the tailgate support rod is completed according to the tailgate rigid body modal frequency and the road surface excitation frequency.

2. The method according to claim 1, wherein Before the step of obtaining the vibration acceleration of the tailgate in different directions collected by the preset sensor, the method further includes: Get the vehicle's speed and tailgate status; determining whether the speed is greater than a first preset speed, and obtaining a first determination result when the speed is greater than the first preset speed; determining whether the tailgate of the vehicle is in a closed state, and obtaining a second determination result when the tailgate of the vehicle is in a closed state; When the first judgment result and the second judgment result are simultaneously met, the road noise detection condition is met; The obtaining of the vibration acceleration of the tailgate in different directions collected by the preset sensor further includes: When the judgment result is that the road noise detection condition is met, the vibration acceleration of the tailgate in different directions collected by a preset sensor is obtained.

3. The method according to claim 1, wherein The step of obtaining the vibration acceleration of the tailgate in different directions collected by the preset sensor includes: Obtaining the tailgate vibration frequency collected by the preset sensor; When the vibration frequency of the tailgate is within a preset vibration frequency range, a first acceleration of the tailgate in a first direction, a second acceleration in a second direction, and a third acceleration in a third direction are collected, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

4. The method according to claim 1, wherein Before the step of obtaining the control current according to the target vibration acceleration and the preset vibration acceleration-current mapping table, the method further includes: acquiring a first velocity and a first vibration acceleration of the vehicle; obtaining, according to the first speed and the first vibration acceleration, road noise of the vehicle at the first speed and the first vibration acceleration; adjusting the control current according to the road noise, and recording the first speed, the first vibration acceleration, and the current control current when the road noise disappears; When the recording is completed, the first speed is updated to obtain an updated first speed, the first vibration acceleration is updated according to the updated first speed, and the process returns to the step of obtaining the road noise of the vehicle under the first speed and the first vibration acceleration according to the first speed and the first vibration acceleration; When the first speed is a second preset speed, recording is stopped to obtain the preset vibration acceleration-current mapping table.

5. The method according to claim 1, wherein Before the step of searching the target vibration acceleration in the preset vibration acceleration-current mapping table to obtain the acceleration-current mapping relationship, the method further includes: Obtaining a vehicle speed, a first preset speed, and a second preset speed; determining whether the speed is greater than the first preset speed and less than the second preset speed; When the speed is greater than the first preset speed and less than the second preset speed, obtaining a third judgment result; Determining whether the vibration acceleration has the acceleration-current mapping relationship; When the vibration acceleration has the acceleration-current mapping relationship, obtaining a fourth judgment result; When the third judgment result and the fourth judgment result are satisfied at the same time, the vibration acceleration is searched in the preset vibration acceleration-current mapping table.

6. A road noise control device based on controlling a tailgate stay according to any one of claims 1 to 5, characterized in that: The device comprises: An acquisition module is used to obtain the vibration acceleration of the tailgate in different directions collected by a preset sensor; a calculation module, configured to calculate a target vibration acceleration according to the vibration accelerations in different directions; An obtaining module, configured to obtain a control current according to the target vibration acceleration and a preset vibration acceleration-current mapping table; The control module is used to adjust the motion parameters of the tailgate support rod of the vehicle according to the control current to complete the road noise control of the tailgate support rod.

7. A road noise control device based on controlling the tailgate support rod, 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 road noise control method based on controlling a tailgate stay according to any one of claims 1 to 5.

8. A storage medium, characterized in that: The storage medium is a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the road noise control method based on controlling a tailgate stay are implemented as claimed in any one of claims 1 to 5.

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