Braking noise diagnosis method, device and equipment

Abstract

The invention discloses a brake noise diagnosis method, device and equipment, and relates to the technical field of noise, the method comprises the following steps: when vehicle brake noise exists under a brake working condition, analyzing the vehicle brake noise, and determining noise order characteristics; analyzing the vibration data of each steering knuckle corresponding to the braking working condition, and determining vibration order characteristics; and noise diagnosis is carried out according to the vibration order characteristics and the noise order characteristics, and a braking noise source is determined. Through the mode, the low-frequency braking noise can be diagnosed through the noise order characteristics and the vibration order characteristics under the braking working condition, so that the source of the braking noise is efficiently and accurately determined, the problem source can be quickly locked, and the troubleshooting time is saved.

Description

Technical Field

[0001] The present application relates to the field of noise technology, and in particular to a method, device and equipment for diagnosing brake noise. Background Art

[0002] During the braking process, the vehicle will continue to produce low-frequency roaring noise when the speed changes from high speed to low speed. At present, the source of the roaring noise during braking is usually analyzed by the source-path-response method, which requires checking the chassis components and the body to find the vibration source. Through the above method, it is impossible to accurately locate the noise source of the low-frequency braking noise caused by defects in the brake disc or friction pad. Summary of the invention

[0003] The main purpose of the present application is to provide a method, device and equipment for diagnosing brake noise, aiming to solve the technical problem in the prior art that the noise source of the low-frequency brake noise generated during the braking process cannot be accurately located.

[0004] To achieve the above object, the present application proposes a brake noise diagnosis method, the brake noise diagnosis method comprising:

[0005] When low-frequency braking noise exists under braking conditions, the low-frequency braking noise is analyzed to determine the noise order characteristics;

[0006] Analyzing the vibration data of each steering knuckle corresponding to the braking condition to determine the vibration order characteristics;

[0007] Noise diagnosis is performed according to the vibration order characteristics and the noise order characteristics to determine the source of the braking noise.

[0008] In one embodiment, when there is low-frequency braking noise under the braking condition, the step of analyzing the low-frequency braking noise to determine the noise order characteristics includes:

[0009] When low-frequency braking noise exists under braking conditions, Fourier transform is performed on the low-frequency braking noise, and a noise spectrum diagram is generated according to the Fourier transform result;

[0010] Performing filtering analysis on the noise spectrum to determine target order noise and target resonance band noise;

[0011] A noise order characteristic is determined according to the target order noise and the target resonance band noise.

[0012] In one embodiment, the step of performing noise diagnosis according to the vibration order characteristics and the noise order characteristics to determine the source of the braking noise includes:

[0013] Comparing the vibration order characteristics with the noise order characteristics;

[0014] When the comparison result shows that the vibration order feature and the noise order feature have the same order feature, noise positioning is performed according to the noise order feature and the vibration order feature to determine the source of the braking noise.

[0015] In one embodiment, the step of performing noise location according to the noise order characteristics and the vibration order characteristics to determine the source of the braking noise includes:

[0016] Determining a target order noise and a target resonance band noise according to the noise order characteristics;

[0017] Performing analysis based on the noise order of the target order noise and the number of heat dissipation ribs of the brake disc to obtain a first analysis result;

[0018] Performing characteristic analysis according to the vibration order characteristics and vibration data of associated components to obtain a second analysis result;

[0019] A source of the brake noise is determined according to the first analysis result and the second analysis result.

[0020] In one embodiment, the step of performing feature analysis based on the vibration order feature and the vibration data of the associated component to obtain a second analysis result includes:

[0021] determining a component resonance band characteristic based on vibration data of an associated component;

[0022] comparing the vibration order characteristics with the component resonance band characteristics;

[0023] When the comparison result shows that the vibration order characteristic and the component resonance band characteristic have the same resonance band characteristic, the same resonance band characteristic is compared with the modal characteristic of the associated component to obtain a second analysis result.

[0024] In one embodiment, the step of determining the source of the brake noise according to the first analysis result and the second analysis result comprises:

[0025] When the first analysis result is that the noise order is inconsistent with the number of the heat dissipation ribs and the second analysis result is that the resonance band characteristics are consistent, determining the resonance component according to the second analysis result;

[0026] A source of the brake noise is determined based on the resonant component.

[0027] In one embodiment, after the step of performing noise diagnosis according to the vibration order characteristics and the noise order characteristics to determine the source of the braking noise, the method further includes:

[0028] determining a noise coping strategy according to the brake noise source;

[0029] Braking noise improvement is performed according to the noise countermeasure strategy.

[0030] In addition, to achieve the above-mentioned purpose, the present application also proposes a brake noise diagnostic device, the brake noise diagnostic device comprising:

[0031] An analysis module, used for analyzing the low-frequency braking noise when there is low-frequency braking noise under braking conditions to determine the noise order characteristics;

[0032] The analysis module is further used to analyze the vibration data of each steering knuckle corresponding to the braking condition to determine the vibration order characteristics;

[0033] The diagnosis module is used to perform noise diagnosis according to the vibration order characteristics and the noise order characteristics to determine the source of the braking noise.

[0034] In addition, to achieve the above-mentioned purpose, the present application also proposes a diagnostic device for brake noise, which 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 diagnostic method for brake noise as described above.

[0035] 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 on the storage medium. When the computer program is executed by a processor, the steps of the brake noise diagnosis method described above are implemented.

[0036] 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 brake noise diagnosis method described above are implemented.

[0037] The present application analyzes the low-frequency braking noise when there is low-frequency braking noise under braking conditions to determine the noise order characteristics; analyzes the vibration data of each steering knuckle corresponding to the braking conditions to determine the vibration order characteristics; and performs noise diagnosis based on the vibration order characteristics and the noise order characteristics to determine the source of the braking noise. In the above manner, the low-frequency braking noise can be diagnosed through the noise order characteristics and vibration order characteristics under braking conditions, thereby efficiently and accurately determining the source of the braking noise, and quickly locking the source of the problem, saving troubleshooting time. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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.

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0040] Figure 1 A flow chart of a first embodiment of a method for diagnosing brake noise according to the present application;

[0041] Figure 2 A schematic diagram of a low-frequency brake noise spectrum of the brake noise diagnosis method provided in Embodiment 1 of the present application;

[0042] Figure 3 A schematic diagram of a vibration spectrum of a steering knuckle of a method for diagnosing brake noise provided in Example 1 of the present application;

[0043] Figure 4 A schematic diagram of a flow chart provided for Embodiment 2 of the method for diagnosing brake noise of the present application;

[0044] Figure 5 A schematic diagram of a brake disc for a method for diagnosing brake noise provided in Embodiment 2 of the present application;

[0045] Figure 6 A schematic diagram of a vibration spectrum of a subframe of a method for diagnosing brake noise provided in Embodiment 2 of the present application;

[0046] Figure 7 A schematic diagram of a rigid body mode of a subframe of a method for diagnosing brake noise provided in Embodiment 2 of the present application;

[0047] Figure 8 This is a schematic diagram of the module structure of the diagnostic device for brake noise according to an embodiment of the present application;

[0048] Fig. 9 Schematic diagram of the device structure of the hardware operating environment involved in the method for diagnosing brake noise in the embodiment of the present application.

[0049] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0050] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0051] 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.

[0052] The main solution of the embodiment of the present application is: when low-frequency braking noise exists under braking conditions, the low-frequency braking noise is analyzed to determine the noise order characteristics; the vibration data of each steering knuckle corresponding to the braking condition is analyzed to determine the vibration order characteristics; noise diagnosis is performed according to the vibration order characteristics and the noise order characteristics to determine the source of the braking noise.

[0053] At present, the source of the booming noise generated during braking is usually analyzed by the source-path-response analysis method, which requires checking the chassis components and the body to find the vibration source. Through the above method, it is impossible to accurately locate the noise source of the low-frequency braking noise caused by defects in the brake disc or friction pad.

[0054] The present application provides a solution to diagnose low-frequency brake noise through the noise order characteristics and vibration order characteristics under braking conditions, so as to efficiently and accurately determine the source of the brake noise, quickly identify the source of the problem, and save troubleshooting time.

[0055] It should be noted that the execution subject of this embodiment may be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or a brake noise diagnostic device capable of realizing the above functions, etc. The following takes the brake noise diagnostic device as an example of the execution subject to illustrate this embodiment and the following embodiments.

[0056] Based on this, the embodiment of the present application provides a method for diagnosing brake noise, referring to Figure 1 , Figure 1 This is a flow chart of a first embodiment of a method for diagnosing brake noise of the present application.

[0057] In this embodiment, the brake noise diagnosis method includes steps S10 to S30:

[0058] Step S10: When low-frequency braking noise exists under braking conditions, the low-frequency braking noise is analyzed to determine the noise order characteristics.

[0059] It should be noted that when the vehicle is in a braking condition and there is low-frequency braking noise when decelerating from high speed to low speed, the noise source diagnosis of the low-frequency braking noise is performed. At this time, the spectrum analysis of the low-frequency braking noise is performed to identify all problematic noise orders, thereby obtaining the noise order characteristics corresponding to the low-frequency braking noise. In this embodiment, the low-frequency braking noise covers the entire braking process; the noise order characteristics include but are not limited to simple order noise and low-order resonance band noise.

[0060] In a feasible implementation, step S10 may include steps A11 to A13:

[0061] Step A11, when low-frequency braking noise exists under braking conditions, Fourier transform is performed on the low-frequency braking noise, and a noise spectrum diagram is generated according to the Fourier transform result.

[0062] Step A12, performing filtering analysis on the noise spectrum to determine target order noise and target resonance band noise.

[0063] Step A13: determining a noise order characteristic according to the target order noise and the target resonance band noise.

[0064] It should be noted that when there is low-frequency braking noise under braking conditions, the collected low-frequency braking noise is pre-processed, such as removing DC offset, windowing, etc. The low-frequency braking noise in the time domain is converted into a noise signal in the frequency domain using fast Fourier transform, and the corresponding noise spectrum is generated to show the noise intensity at different frequencies, such as Figure 2 The noise spectrum is shown in Figure 2.

[0065] It is understandable that filtering analysis is performed on the noise spectrum diagram to confirm the frequency band or order of the roar in the car, and the coordinates are adjusted to the appropriate magnitude until all the problematic noise orders can be clearly seen in the spectrum diagram, so that the noise characteristics in the noise spectrum diagram are more obvious. In this case, it can be clearly seen that the roar in the car consists of two parts, one is pure order noise, and the other is low-order resonance band noise. In this embodiment, the target order noise refers to pure order noise, and the target resonance band noise refers to low-order resonance band noise. Based on the distinguished target order noise and target resonance band noise, the noise order characteristics corresponding to the low-frequency braking noise can be obtained.

[0066] Step S20, analyzing the vibration data of each steering knuckle corresponding to the braking condition to determine the vibration order characteristics.

[0067] It should be noted that the vibration data of each steering knuckle refers to the vibration of the steering knuckles at all wheels on the vehicle. In this embodiment, the braking condition when obtaining the vibration data of each steering knuckle is consistent with the condition when obtaining the low-frequency braking noise, and the vibration data of each steering knuckle covers the entire braking process. The spectrum analysis of the vibration data of each steering knuckle is performed to generate the corresponding spectrum diagram, such as Figure 3 As shown, Figure 3 The frequency spectrum corresponding to a certain steering knuckle vibration data is used to find the order characteristics in the corresponding steering knuckle vibration data. In this embodiment, the vibration order characteristics include the order characteristics in all steering knuckle vibration data.

[0068] Step S30: performing noise diagnosis according to the vibration order characteristics and the noise order characteristics to determine the source of the braking noise.

[0069] It should be noted that the vibration order characteristics and noise order characteristics are compared to determine whether there are order characteristics consistent with the noise order characteristics in the steering knuckle vibration data. If there are similar order characteristics in one or more steering knuckle vibration data, further analysis is performed. If the simple order noise is consistent with the number of brake disc cooling ribs, it is considered that the noise is caused by the deformation of the brake disc. If the roar in the car belongs to the order resonance band type, look for the modal characteristics of other chassis components (such as the subframe) associated with the brake disc. By comparing the vibration spectrum of the subframe and its rigid body mode, confirm whether the resonance band characteristics are consistent. In the end, it can be determined that the source of the brake noise corresponds to the low-frequency brake noise.

[0070] In a feasible implementation manner, after step S30, steps B11 to B12 may be included:

[0071] Step B11, determining a noise coping strategy according to the brake noise source.

[0072] Step B12: improving braking noise according to the noise coping strategy.

[0073] It should be noted that the corresponding noise coping strategy is determined according to the source of the braking noise, and the braking noise is improved through the noise coping strategy, thereby reducing the low-frequency braking noise. In this embodiment, the coping strategies corresponding to different sources of braking noise are stored locally. For example, if the low-frequency braking noise is caused by the deformation of the brake disc, the corresponding coping strategy may be to replace the heat dissipation ribs on the brake disc; if the vibration caused by the brake disc is transmitted through the structure and resonates and amplifies the low-frequency braking noise on the path, then damping materials can be added to the associated components that generate resonance to reduce vibration transmission. Other methods can also be used, and this embodiment does not limit this.

[0074] This embodiment analyzes the low-frequency braking noise when there is low-frequency braking noise under braking conditions to determine the noise order characteristics; analyzes the vibration data of each steering knuckle corresponding to the braking conditions to determine the vibration order characteristics; and performs noise diagnosis based on the vibration order characteristics and the noise order characteristics to determine the source of the braking noise. In the above manner, the low-frequency braking noise can be diagnosed through the noise order characteristics and vibration order characteristics under braking conditions, thereby efficiently and accurately determining the source of the braking noise, and quickly locking the source of the problem, saving troubleshooting time.

[0075] 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-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 4 In the method for diagnosing brake noise, step S30 further includes steps S31 to S32:

[0076] Step S31, comparing the vibration order characteristics with the noise order characteristics.

[0077] Step S32: when the comparison result shows that the vibration order feature and the noise order feature have the same order feature, noise location is performed according to the noise order feature and the vibration order feature to determine the source of the braking noise.

[0078] It should be noted that the vibration order characteristics and noise order characteristics are compared to determine whether there are order characteristics consistent with the noise order characteristics in the steering knuckle vibration data. If there are similar order characteristics in one or more steering knuckle vibration data, it means that the comparison result is that the vibration order characteristics and the noise order characteristics have the same order characteristics. At this time, further analysis is required based on the noise order characteristics and vibration order characteristics to determine the source of the braking noise.

[0079] In a feasible implementation, step S32 may include steps C11 to C14:

[0080] Step C11, determining a target order noise and a target resonance band noise according to the noise order characteristics.

[0081] Step C12, analyzing according to the noise order of the target order noise and the number of heat dissipation ribs of the brake disc to obtain a first analysis result.

[0082] It should be noted that the number of heat dissipation ribs on the brake disc on the vehicle is found, and the noise order of the target order noise is compared with the number of heat dissipation ribs to obtain the result of whether the noise order is consistent with the number of heat dissipation ribs. If the number of heat dissipation ribs is consistent with the order of the simple order vibration, it means that this order is caused by the deformation of the brake disc, which is generally caused by overheating of the brake disc, resulting in uneven heat dissipation of the heat dissipation ribs and their intervals, and striped ablation marks appear on the disc surface, such as Figure 5 As shown in the figure, the brake pressure fluctuates multiple times (the number of times corresponding to the number of heat dissipation ribs) when the brake disc rotates one circle, so order vibration occurs, which in turn causes order noise in the car.

[0083] Step C13, performing characteristic analysis based on the vibration order characteristics and vibration data of related components to obtain a second analysis result.

[0084] It should be noted that, based on the low-order resonance band noise existing in the low-frequency brake noise, when it is clear that the roar in the car belongs to the order resonance band type, the modal characteristics of other chassis components (such as subframes) associated with the brake disc are searched. By comparing the vibration order characteristics and the vibration data of the associated components, and then comparing the vibration spectrum of the associated components and its rigid body mode, it is confirmed whether the resonance band characteristics are consistent, thereby obtaining the second analysis result of whether the resonance band characteristics are consistent, and finally it can be determined that the brake noise source corresponding to the low-frequency brake noise.

[0085] In a feasible implementation manner, step C13 may include steps D11 to D13:

[0086] Step D11, determining the resonance band characteristics of the component according to the vibration data of the associated component.

[0087] Step D12, comparing the vibration order characteristics with the component resonance band characteristics.

[0088] Step D13, when the comparison result shows that the vibration order characteristic and the component resonance band characteristic have the same resonance band characteristic, the same resonance band characteristic is compared with the modal characteristic of the associated component to obtain a second analysis result.

[0089] It should be noted that the associated components are other chassis components associated with the brake disc. The vibration data of the associated components under braking conditions and their corresponding rigid body modal characteristics are obtained. The vibration data of the associated components are subjected to spectrum analysis to determine the component resonance band characteristics in the vibration data of the associated components.

[0090] It can be understood that when the vibration order characteristics and the component resonance band characteristics are compared, if the component resonance band characteristics have order resonance band characteristics similar to those in the vibration order characteristics, then the comparison result indicates that the vibration order characteristics and the component resonance band characteristics have the same resonance band characteristics. In this embodiment, the order resonance band characteristics that appear in the component resonance band characteristics and are similar to those in the vibration order characteristics are the same resonance band characteristics.

[0091] In a specific implementation, the same resonance band feature consistency and the modal characteristics of the associated components are compared to determine whether the resonance band feature consistency and the modal characteristics are consistent. When the same resonance band feature and the modal characteristics are consistent, it means that the second analysis result is the resonance band feature consistency; otherwise, it means that the second analysis result is the resonance band feature inconsistency. Figure 6 is the vibration spectrum of the subframe, Figure 7 is the rigid body modal characteristic of the subframe. By comparison, it can be seen that the modal characteristics are consistent with the resonance band characteristics.

[0092] Step C14: determining the source of the braking noise according to the first analysis result and the second analysis result.

[0093] In a feasible implementation, step C14 may include steps E11 to E12:

[0094] Step E11, when the first analysis result is that the noise order is inconsistent with the number of the heat dissipation ribs and the second analysis result is that the resonance band characteristics are consistent, determine the resonance component according to the second analysis result.

[0095] Step E12: determining the source of the braking noise according to the resonance component.

[0096] It should be noted that when the first analysis result is that the noise order is consistent with the number of heat dissipation ribs and the second analysis result is consistent with the resonance band characteristics, the associated component corresponding to the second analysis result being consistent with the resonance band characteristics is the associated component that resonates with the brake disc. In this embodiment, the associated component that resonates with the brake disc is the resonant component. At this time, it can be determined that the brake noise sources of the low-frequency brake noise mainly include the following two sources: 1. Deformation of the brake disc; 2. The vibration caused by the brake disc is transmitted through the structure and resonates and amplifies with the resonant component on the path.

[0097] It can be understood that when the first analysis result shows that the noise order is inconsistent with the number of heat dissipation ribs and the second analysis result shows that the resonance band characteristics are consistent, the resonance component can be determined through the second analysis result. At this time, it can be determined that the brake noise source of the low-frequency brake noise is mainly caused by the vibration caused by the brake disc, which is transmitted through the structure and resonates and amplifies with the resonance component on the path.

[0098] In a specific implementation, when the first analysis result is that the noise order is consistent with the number of heat dissipation ribs and the second analysis result is that the resonance band characteristics are inconsistent, it can be determined that the brake noise source of the low-frequency brake noise is mainly caused by brake disc deformation.

[0099] In this embodiment, the vibration order feature is compared with the noise order feature; when the comparison result shows that the vibration order feature and the noise order feature have the same order feature, the noise is located according to the noise order feature and the vibration order feature to determine the source of the braking noise. In this way, the source of the braking noise can be accurately located.

[0100] For example, in order to help understand the implementation process of the brake noise diagnosis method obtained by combining this embodiment with the above-mentioned embodiment 1, specifically:

[0101] The method of this embodiment collects the noise inside the car and the vibration of the steering knuckle under braking conditions, and there is a correlation between the two. There are obvious integer orders in the vibration of the steering knuckle, including the order corresponding to the number of heat dissipation ribs of the brake disc and other lower integer orders. Therefore, there may be two situations of roaring in the car: one is the order vibration caused by the number of heat dissipation ribs of the brake disc, generally at 100-500Hz, transmitted to the car through the structure or air path; the second is the lower integer order (lower than the number of heat dissipation ribs) vibration, coupled with the mode of other chassis parts, such as the rigid body mode of the subframe and the rigid body mode of the powertrain, causing resonance, and transmitted to the car through the structural path. This roar is generally lower than 100Hz. This embodiment targets the roar caused by the deformation of the ventilated brake disc, collects the vibration signal of the steering knuckle, finds the corresponding relationship with the roar, and then judges whether it is related to the brake disc based on the order vibration characteristics on the steering knuckle, so as to find the cause of the fault.

[0102] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the diagnostic method of brake noise of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0103] This application also provides a diagnostic device for brake noise, please refer to Figure 8 , the brake noise diagnostic device comprises:

[0104] The analysis module 10 is used to analyze the low-frequency braking noise when there is low-frequency braking noise under braking conditions to determine the noise order characteristics.

[0105] The analysis module 10 is further used to analyze the vibration data of each steering knuckle corresponding to the braking condition to determine the vibration order characteristics.

[0106] The diagnosis module 20 is used to perform noise diagnosis according to the vibration order characteristics and the noise order characteristics to determine the source of the braking noise.

[0107] Optionally, the analysis module 10 is further used for:

[0108] When low-frequency braking noise exists under braking conditions, Fourier transform is performed on the low-frequency braking noise, and a noise spectrum diagram is generated according to the Fourier transform result; filtering analysis is performed on the noise spectrum diagram to determine a target order noise and a target resonance band noise; and a noise order characteristic is determined according to the target order noise and the target resonance band noise.

[0109] Optionally, the diagnosis module 20 is further used for:

[0110] The vibration order characteristics are compared with the noise order characteristics; when the comparison result shows that the vibration order characteristics and the noise order characteristics have the same order characteristics, noise positioning is performed according to the noise order characteristics and the vibration order characteristics to determine the source of the braking noise.

[0111] Optionally, the diagnosis module 20 is further used for:

[0112] Determine the target order noise and the target resonance band noise according to the noise order characteristics; perform analysis according to the noise order of the target order noise and the number of heat dissipation ribs of the brake disc to obtain a first analysis result; perform feature analysis according to the vibration order characteristics and vibration data of related components to obtain a second analysis result; determine the source of the braking noise according to the first analysis result and the second analysis result.

[0113] Optionally, the diagnosis module 20 is further used for:

[0114] Determine the component resonance band characteristics according to the vibration data of the associated component; compare the vibration order characteristics with the component resonance band characteristics; when the comparison result shows that the vibration order characteristics and the component resonance band characteristics have the same resonance band characteristics, compare the same resonance band characteristics with the modal characteristics of the associated component to obtain a second analysis result.

[0115] Optionally, the diagnosis module 20 is further used for:

[0116] When the first analysis result is that the noise order is inconsistent with the number of the heat dissipation ribs and the second analysis result is that the resonance band characteristics are consistent, the resonance component is determined according to the second analysis result; and the source of the braking noise is determined according to the resonance component.

[0117] Optionally, the diagnosis module 20 is further used for:

[0118] A noise coping strategy is determined according to the brake noise source; and brake noise is improved according to the noise coping strategy.

[0119] The diagnostic device for brake noise provided by the present application adopts the diagnostic method for brake noise in the above embodiment, which can solve the technical problem that the prior art cannot accurately locate the source of the low-frequency brake noise generated during braking. Compared with the prior art, the beneficial effect of the diagnostic device for brake noise provided by the present application is the same as the beneficial effect of the diagnostic method for brake noise provided by the above embodiment, and the other technical features of the diagnostic device for brake noise are the same as the features disclosed in the above embodiment method, which will not be described in detail here.

[0120] The present application provides a brake noise diagnostic device, which 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 so that the at least one processor can execute the brake noise diagnostic method in the above-mentioned embodiment 1.

[0121] Reference below Fig. 9 , which shows a schematic diagram of the structure of a diagnostic device for brake noise suitable for implementing the embodiment of the present application. The diagnostic device for brake noise in the embodiment of the present application may 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), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Fig. 9 The brake noise diagnostic device 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.

[0122] like Fig. 9As shown, the diagnostic device for brake noise may include a processing device 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the diagnostic device for brake noise are also stored. The processing device 1001, ROM1002, and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the diagnostic device for brake noise to communicate with other devices wirelessly or by wire to exchange data. Although the diagnostic device for brake noise with various systems is shown in the figure, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have alternatively.

[0123] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a 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 through 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.

[0124] The diagnostic device for brake noise provided by the present application adopts the diagnostic method for brake noise in the above embodiment, which can solve the technical problem that the prior art cannot accurately locate the source of the low-frequency brake noise generated during braking. Compared with the prior art, the beneficial effects of the diagnostic device for brake noise provided by the present application are the same as the beneficial effects of the diagnostic method for brake noise provided by the above embodiment, and the other technical features of the diagnostic device for brake noise are the same as the features disclosed in the method of the previous embodiment, which will not be described in detail here.

[0125] It should be understood that the various parts disclosed in this application can be implemented by 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.

[0126] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0127] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the brake noise diagnosis method in the above-mentioned embodiment.

[0128] The computer-readable storage medium provided in the present 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 of the above. 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 of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination 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 of the above.

[0129] The computer-readable storage medium may be included in the brake noise diagnostic device; or may exist independently without being assembled into the brake noise diagnostic device.

[0130] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the diagnostic device for brake noise, the diagnostic device for brake noise: when there is low-frequency brake noise under braking conditions, analyze the low-frequency brake noise to determine the noise order characteristics; analyze the vibration data of each steering knuckle corresponding to the braking conditions to determine the vibration order characteristics; perform noise diagnosis based on the vibration order characteristics and the noise order characteristics to determine the source of the brake noise. In the above manner, noise diagnosis can be performed through the noise order characteristics and vibration order characteristics under braking conditions, thereby efficiently and accurately locating the source of the low-frequency brake noise, quickly locking the source of the problem, and saving troubleshooting time.

[0131] 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 separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of 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., via the Internet using an Internet service provider).

[0132] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the 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 square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square 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 square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0133] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0134] The readable storage medium provided by the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned brake noise diagnosis method, and can solve the technical problem in the prior art that the noise source of the low-frequency brake noise generated during the braking process cannot be accurately located. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by the present application are the same as the beneficial effects of the brake noise diagnosis method provided by the above-mentioned embodiment, and will not be repeated here.

[0135] The present application also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the steps of the above-mentioned method for diagnosing brake noise are implemented.

[0136] The computer program product provided by the present application can solve the technical problem that the prior art cannot accurately locate the source of the low-frequency brake noise generated during braking. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as those of the brake noise diagnosis method provided by the above embodiment, and will not be elaborated here.

[0137] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for diagnosing brake noise, characterized in that: The method for diagnosing brake noise comprises: When there is vehicle braking noise under braking conditions, analyzing the vehicle braking noise to determine the noise order characteristics; Analyzing the vibration data of each steering knuckle corresponding to the braking condition to determine the vibration order characteristics; Noise diagnosis is performed according to the vibration order characteristics and the noise order characteristics to determine the source of the braking noise.

2. The method according to claim 1, characterized in that When there is vehicle braking noise under the braking condition, the step of analyzing the vehicle braking noise and determining the noise order characteristics comprises: When there is vehicle braking noise under braking conditions, Fourier transform is performed on the vehicle braking noise, and a noise spectrum diagram is generated according to the Fourier transform result; Performing filtering analysis on the noise spectrum to determine target order noise and target resonance band noise; A noise order characteristic is determined according to the target order noise and the target resonance band noise.

3. The method according to claim 1, characterized in that The step of performing noise diagnosis according to the vibration order characteristics and the noise order characteristics to determine the source of the braking noise comprises: Comparing the vibration order characteristics with the noise order characteristics; When the comparison result shows that the vibration order feature and the noise order feature have the same order feature, noise positioning is performed according to the noise order feature and the vibration order feature to determine the source of the braking noise.

4. The method according to claim 3, characterized in that The step of locating the noise according to the noise order characteristics and the vibration order characteristics to determine the source of the braking noise comprises: Determining a target order noise and a target resonance band noise according to the noise order characteristics; Performing analysis based on the noise order of the target order noise and the number of heat dissipation ribs of the brake disc to obtain a first analysis result; Performing characteristic analysis according to the vibration order characteristics and vibration data of associated components to obtain a second analysis result; A source of the brake noise is determined according to the first analysis result and the second analysis result.

5. The method according to claim 4, characterized in that The step of performing feature analysis based on the vibration order feature and the vibration data of the associated components to obtain a second analysis result comprises: determining a component resonance band characteristic based on vibration data of an associated component; comparing the vibration order characteristics with the component resonance band characteristics; When the comparison result shows that the vibration order characteristic and the component resonance band characteristic have the same resonance band characteristic, the same resonance band characteristic is compared with the modal characteristic of the associated component to obtain a second analysis result.

6. The method according to claim 4, characterized in that The step of determining the source of the brake noise according to the first analysis result and the second analysis result comprises: When the first analysis result is that the noise order is inconsistent with the number of the heat dissipation ribs and the second analysis result is that the resonance band characteristics are consistent, determining the resonance component according to the second analysis result; A source of the brake noise is determined based on the resonant component.

7. The method according to any one of claims 1 to 6, characterized in that After the step of performing noise diagnosis according to the vibration order characteristics and the noise order characteristics to determine the source of the brake noise, the method further includes: determining a noise coping strategy according to the brake noise source; Braking noise improvement is performed according to the noise countermeasure strategy.

8. A diagnostic device for brake noise, characterized in that: The brake noise diagnostic device comprises: An analysis module, used for analyzing the vehicle braking noise when there is vehicle braking noise under braking conditions to determine the noise order characteristics; The analysis module is further used to analyze the vibration data of each steering knuckle corresponding to the braking condition to determine the vibration order characteristics; The diagnosis module is used to perform noise diagnosis according to the vibration order characteristics and the noise order characteristics to determine the source of the braking noise.

9. A diagnostic device for brake noise, characterized in that: The brake noise diagnostic device includes: a memory, a processor, and a brake noise diagnostic program stored in the memory and executable on the processor, wherein the brake noise diagnostic program is configured to implement a brake noise diagnostic method according to any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium stores a brake noise diagnostic program, and when the brake noise diagnostic program is executed by the processor, the brake noise diagnostic method according to any one of claims 1 to 7 is implemented.

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