Crawling starting noise identification method and device, electronic equipment and medium

Abstract

The invention discloses a wriggling starting noise recognition method and device, electronic equipment and a medium. The wriggling starting noise recognition method and device are used for recognizing wriggling starting noise. The method comprises the steps that actually-measured data are received, the actually-measured data comprise brake pipeline pressure, driving torque and vibration acceleration collected by an acceleration sensor on a suspension, and the actually-measured data are the vibration acceleration collected by the acceleration sensor when a brake pedal of a vehicle is in a treading state; the noise frequency of the in-vehicle actually-measured sound data is matched with the data acquired when the acceleration sensor is matched with the noise frequency of the in-vehicle actually-measured sound data; and according to the brake pipeline pressure, the driving torque and the vibration acceleration, whether the actually-measured sound data is the wriggling starting noise or not is determined.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a method, device, electronic equipment and medium for recognizing creeping start noise. Background Art

[0002] In recent years, as the market's requirements for commodity comfort have gradually increased, brake noise has become a common market complaint point in the market, and the development and market sides have paid more and more attention to it. Among them, starting brake Groan (creeping starting noise) is one of the main complaints about brake noise. The mechanism of the brake Groan problem is that when the vehicle is stationary and rotating, there are traction and braking forces at the same time. The vehicle is in a state of seemingly rotating but not rotating. The stick-slip motion of the friction plate during the static-dynamic or dynamic-static μ conversion process causes pulse vibration and noise. The cause is relatively complicated, and involves multiple vehicle parts.

[0003] Currently, there is a lack of a solution for creep start noise recognition. Summary of the invention

[0004] The present application provides a method, device, electronic device and medium for identifying creeping start noise, so as to identify creeping start noise.

[0005] In a first aspect, a method for recognizing creeping start noise is provided, comprising:

[0006] Receiving measured data, the measured data including brake line pressure, driving torque, and vibration acceleration collected by an acceleration sensor on the suspension, wherein the measured data is data collected when the noise frequency of the measured sound data in the vehicle matches the acceleration sensor when the brake pedal of the vehicle is in a depressed state;

[0007] It is determined whether the measured sound data is creeping start noise according to the brake line pressure, the driving torque and the vibration acceleration.

[0008] In one implementation, determining whether the measured sound data is creeping start noise according to the brake line pressure, the driving torque and the vibration acceleration includes:

[0009] When the driving torque is greater than or equal to a preset torque value, the second-order moment root value corresponding to the vibration acceleration is greater than or equal to a preset calibration value, and the brake line pressure is within a preset pressure range, determining that the measured sound data is the creeping start noise;

[0010] When the driving torque is less than the preset torque value, or the second-order moment root value corresponding to the vibration acceleration is less than the preset calibration value, or the brake line pressure is not within the preset pressure range, it is determined that the measured sound data is not the creeping start noise.

[0011] In one implementation, the second-order moment root value corresponding to the vibration acceleration is obtained by:

[0012] Performing Fourier transformation on the vibration acceleration to convert it into a first-order frequency domain signal;

[0013] Calculate the second-order root moment value of the first-order frequency domain signal within a preset frequency range.

[0014] In one implementation, the measured data includes brake line pressures and the vibration accelerations corresponding to multiple rounds of tests, the brake line pressures in each round of the tests are different, and the same brake line pressure is maintained in the same round of the tests.

[0015] In one implementation, the test range of the brake line pressure is 3 bar to 20 bar, and a round of the test is performed at intervals of 1 bar.

[0016] In one implementation, after determining whether the measured sound data is creeping start noise according to the brake line pressure, the driving torque and the vibration acceleration, the method further includes:

[0017] Determining a brake line pressure-driving torque interval according to the test interval of the brake line pressure and the driving torque, wherein the brake line pressure-driving torque interval includes a range interval in which the creeping start noise is generated;

[0018] An output map corresponding to the brake line pressure-driving torque interval is generated and output, wherein the range interval generating the creeping start noise and the range interval not generating the creeping start noise are distinguished by different marks.

[0019] In one implementation, the measured sound data is collected by a microphone installed at the wheel end or the headrest of the driver's seat.

[0020] In one implementation, the acceleration sensor on the suspension includes one of the following acceleration sensors: an acceleration sensor on a brake caliper, an acceleration sensor on a lower swing arm, an acceleration sensor on a steering knot, an acceleration sensor on a steering rod, and an acceleration sensor on a shock absorber.

[0021] In a second aspect, a creeping start noise recognition device is provided, comprising:

[0022] A receiving module, used to receive measured data, wherein the measured data includes brake line pressure, driving torque, and vibration acceleration collected by an acceleration sensor on the suspension, wherein the measured data is data collected when the noise frequency of the measured sound data matches the acceleration sensor when the brake pedal of the vehicle is in a depressed state;

[0023] The determination module is used to determine whether the measured sound data is creeping start noise according to the brake line pressure, driving torque and vibration acceleration.

[0024] In a third aspect, a creeping start noise test device is provided, the creeping start noise test device comprising a test vehicle, the test vehicle comprising vehicle-mounted equipment, a suspension and a brake line; a vibration acceleration sensor is installed on the suspension, a pickup is installed in the test vehicle, and a line pressure gauge is installed on the brake line, wherein:

[0025] The pickup is used to collect the measured sound data inside the test vehicle when the brake pedal is in the depressed state;

[0026] The acceleration sensor is used to collect the vibration acceleration of the test vehicle when the brake pedal is in a depressed state;

[0027] The pipeline pressure gauge is used to collect the brake pipeline pressure of the test vehicle when the brake pedal is in the depressed state;

[0028] The vehicle-mounted device is used to receive measured data, the measured data including the brake line pressure, driving torque and vibration acceleration, wherein the measured data is data collected when the noise frequency of the measured sound data matches the acceleration sensor; based on the brake line pressure, driving torque and vibration acceleration, determine whether the measured sound data is creeping start noise.

[0029] In one implementation, the pickup is installed at the wheel end or the headrest of the driver's seat.

[0030] In one implementation, the acceleration sensor on the suspension includes one of the following acceleration sensors: an acceleration sensor on a brake caliper, an acceleration sensor on a lower swing arm, an acceleration sensor on a steering knot, an acceleration sensor on a steering rod, and an acceleration sensor on a shock absorber.

[0031] In one implementation, the vehicle-mounted device includes a T-box device.

[0032] In a fourth aspect, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the creeping start noise recognition method as described in any one of the above items are implemented.

[0033] In a fifth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the creeping start noise recognition method as described in any one of the above items are implemented.

[0034] In one of the solutions provided above, the method is based on a creeping start noise test device under a real vehicle. When the noise frequency of the measured sound data matches the vibration frequency of the vibration acceleration collected by the acceleration sensor, the corresponding brake line pressure, driving torque and vibration acceleration measured data are collected, and the creeping start noise is determined based on these data. It can be applied to the product development stage of automobile OEMs, and the main characteristics and occurrence conditions of creeping start noise can be identified under real vehicle conditions, which is beneficial for OEMs to carry out technical research and product problem solving, and improve the design of creeping start noise from the pre-R&D stage, which has great application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0036] Figure 1 It is a schematic diagram of a connection relationship of a creeping start noise test device in one embodiment of the present application;

[0037] Figure 2 This is a schematic diagram of the arrangement of sensors in a creeping start noise test device in one embodiment of the present application;

[0038] Figure 3 It is a flow chart of a method for recognizing creeping start noise in one embodiment of the present application;

[0039] Figure 4 is a schematic diagram of a curve relationship of sensor data in this application;

[0040] Figure 5 yes Figure 3 A specific flow chart of step S20;

[0041] Figure 6 is a schematic diagram of an output diagram corresponding to a brake line pressure-driving torque interval in one embodiment of the present application;

[0042] Figure 7 It is a structural schematic diagram of a creeping start noise recognition device in one embodiment of the present application;

[0043] Figure 8 It is a structural schematic diagram of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] The embodiment of the present application mainly provides a creeping start noise identification method and related devices to effectively identify braking Groan (uniformly referred to as creeping start noise in this application). The solution of the embodiment of the present application is applied to the creeping start noise of various automobiles, and is not specifically limited. For ease of understanding, the creeping start noise test device provided in the embodiment of the present application is first introduced. The creeping start noise test device is built based on a real vehicle (i.e., an actual test vehicle).

[0046] Combination Figure 1 and Figure 2 As shown, in one embodiment, the creeping start noise test device includes a test vehicle, an on-board device, a suspension and a brake line; a vibration acceleration sensor is installed on the suspension, a pickup is installed in the test vehicle, and a line pressure gauge is installed in the brake line, wherein: the pickup is used to collect the measured sound data in the vehicle when the brake pedal of the test vehicle is in a stepped state; the acceleration sensor is used to collect the vibration acceleration of the test vehicle when the brake pedal is in a stepped state; the line pressure gauge is used to collect the brake line pressure of the test vehicle when the brake pedal is in a stepped state; the on-board device is used to receive the measured data, and the measured data includes the brake line pressure, driving torque and vibration acceleration, wherein the measured data is the data collected when the noise frequency of the measured sound data matches the acceleration sensor; according to the brake line pressure, driving torque and vibration acceleration, it is determined whether the measured sound data is creeping start noise. Among them, the on-board device can obtain the pedal state and other signals by reading the on-board bus of the test vehicle.

[0047] In one embodiment, the pickup is installed at the wheel end or the headrest of the main driver's seat. For example, the sound detector can be installed at a certain position just above the wheel center. For example, the sound detector can be installed 20cm-50cm just above the wheel center, or at other positions of the wheel end, without specific limitation.

[0048] In one embodiment, the acceleration sensor on the suspension includes one of the following acceleration sensors: an acceleration sensor 1 of a brake caliper, an acceleration sensor 2 on a lower arm, an acceleration sensor 3 on a steering knot, an acceleration sensor 4 on a steering tie rod, and an acceleration sensor 5 on a shock absorber. Figure 2 For example, Figure 2It is a schematic diagram of the local structure of the test vehicle. Acceleration sensors are installed on the brake caliper, the lower arm, the steering knot, the steering rod and the shock absorber, so that the corresponding vibration acceleration data can be obtained through the installed acceleration sensors. It should be noted that in actual applications, the type and position of the installed acceleration sensor can be selected according to the test requirements, and there is no specific limitation.

[0049] In one embodiment, if Figure 1 As shown, the vehicle-mounted device includes a T-box device, which may have a built-in software module, and is used to implement the creeping start noise identification method in the embodiment of the present application based on the measured data obtained by the creeping start noise test device. It should be noted that the vehicle-mounted device may also be other vehicle-mounted devices on the vehicle, such as a vehicle controller, or other external devices, which are not specifically limited. In this embodiment, since the test is based on the actual vehicle state, it is more convenient and quick to build a creeping start noise test device based on the T-box device.

[0050] It is also worth mentioning that when building a creeping start noise test device, each sensor can be connected to the vehicle-mounted equipment through a noise-resistant cable to reduce the impact of interference data on the test results and further improve the accuracy and reliability of the results.

[0051] In one embodiment, the creeping start noise test device may further include a temperature sensor built into the friction plate and an environmental sensor for obtaining the ambient temperature. The vehicle-mounted equipment may further obtain these measured temperature data to feed back into the creeping start noise identification process, so as to facilitate the analysis of the impact of parameters such as temperature on the creeping start noise, without specific limitation.

[0052] Based on the creeping start noise test device, the embodiment of the present application provides a creeping start noise identification method, which can effectively identify creeping start noise and can be applied to the product development stage of automobile OEMs. From the adaptation of the input brake line pressure and the wheel end drive torque at the moment of starting / stopping, as well as for friction plates of different formulations and the main characteristics and occurrence conditions of creeping start noise under actual vehicle conditions, it is beneficial for OEMs to carry out technical research and product problem solving, and to improve the design of creeping start noise from the pre-research and development stage, which has great application value. The following is a detailed description of a creeping start noise identification method provided by the present application through various embodiments.

[0053] See also Figure 3 As shown, in one embodiment, a method for identifying creeping start noise is provided, which mainly includes the following steps:

[0054] S10: receiving measured data, where the measured data includes brake line pressure, driving torque, and vibration acceleration collected by an acceleration sensor on the suspension.

[0055] During the creeping start noise identification test, it is necessary to select the vehicle model that needs creeping start noise, and then select the actual vehicle corresponding to the vehicle model as the test vehicle. Based on the test vehicle, the creeping start noise test device described in the above embodiment is built, that is, the sensors and connection relationships required for the creeping start noise test device are built, such as acceleration sensor, pipeline pressure gauge, sound recognition device and pedal travel sensor, etc. After the test environment is built, the main driver steps on the brake pedal, and the motor spindle gradually increases the torque to the wheel center until the brake disc rotates. At this time, each sensor can collect the corresponding measured data, and the vehicle-mounted equipment can receive these measured data during the test.

[0056] In this embodiment, the measured data is the data collected when the noise frequency of the measured sound data in the vehicle matches the acceleration sensor when the brake pedal is in the depressed state. That is to say, during the test, when the noise frequency of the measured sound data collected by the microphone matches the vibration frequency of the vibration acceleration collected by the acceleration sensor, the other sensors will send the measured data to the vehicle-mounted device. The frequency matching means that the difference between the noise frequency of the measured sound data and the vibration frequency of the vibration acceleration is less than the preset value. The measured data at this time includes the brake line pressure, the driving torque and the vibration acceleration collected by the acceleration sensor on the suspension in the matching state.

[0057] It should be understood that when creeping start noise occurs, the vibration acceleration collected by the acceleration sensor must have a sudden change. Therefore, based on the sudden change characteristics, measured data with matching frequencies can be obtained to determine whether the measured sound data is creeping start noise.

[0058] S20: Determine whether the measured sound data is creeping start noise according to the brake line pressure, driving torque and vibration acceleration.

[0059] After receiving the measured data, the on-board equipment can determine whether the corresponding measured sound data is creeping start noise based on the brake line pressure, driving torque and vibration acceleration in the measured data, thereby determining whether the sound data currently collected by the pickup is noise.

[0060] It can be seen that in this embodiment, a creeping start noise identification method is provided. The method is based on a creeping start noise test device under a real vehicle. When the noise frequency of the measured sound data is matched with the vibration frequency of the vibration acceleration collected by the acceleration sensor, the corresponding brake line pressure, driving torque and vibration acceleration measured data are collected, and the creeping start noise is determined based on these data. It can be applied to the product development stage of automobile main engine manufacturers, from the adaptation of the input brake line pressure and the wheel end driving torque at the moment of starting / stopping, as well as for friction plates of different formulations and the main characteristics and occurrence conditions of creeping start noise under real vehicle conditions, which is conducive to the main engine manufacturers to carry out technical research and product problem solving, and to improve the design of creeping start noise from the pre-research and development stage, which has great application value.

[0061] It is also worth noting that this embodiment is based on objective data obtained from tests under actual vehicle conditions, rather than some traditional solutions which are based on subjective human evaluation. It can also reduce the non-objectivity brought about by human evaluation, and is also different from some traditional solutions which are merely based on model simulation analysis.

[0062] In one embodiment, when the creeping start noise test device performs an identification test, the test vehicle may be first run-in, and the parameters such as the relevant status of the whole vehicle after the run-in may be recorded. After the run-in is completed, the creeping start noise test device is parked at a selected test site, and the test is performed when the brake disc temperature cools to room temperature. The test run-in includes the data reception between the run-in vehicle equipment and the sensor.

[0063] In this embodiment, running-in and recording are performed before the test, and the temperature of the brake disc is cooled to room temperature, so as to simulate the actual initial state of the actual vehicle for testing, which can further improve the accuracy of the test.

[0064] In one embodiment, in step S20, that is, determining whether the measured sound data is the creeping start noise based on the brake line pressure, the driving torque and the vibration acceleration, includes: when the driving torque ≥ the preset torque value, the second-order moment root value corresponding to the vibration acceleration ≥ the preset calibration value, and the brake line pressure is in the preset pressure interval, then determining that the measured sound data is the creeping start noise; when the driving torque < the preset torque value, or the second-order moment root value corresponding to the vibration acceleration < the preset calibration value, or the brake line pressure is not in the preset pressure interval, then determining that the measured sound data is not the creeping start noise.

[0065] Please read first Figure 4 As stated, Figure 4In the figure, the curve relationship diagram of the brake line pressure (bar), driving torque (Nm), sound pressure value (dB(A)) and vibration acceleration (g) collected during the test is shown in Figure 1. Figure 4 It can be seen that when creeping start noise occurs, the vibration acceleration sensor produces a sudden change. In the interval where creeping start noise occurs (the long shaded area in the figure), the corresponding brake line pressure, driving torque and vibration acceleration show certain threshold characteristics. Therefore, in this embodiment, the received measured data can be used based on Figure 4 , jointly determine whether the measured sound data is creeping start noise. Specifically, when the driving torque ≥ preset torque value, the second-order moment root value corresponding to the vibration acceleration ≥ preset calibration value, and the brake line pressure is within the preset pressure interval, it is determined that the measured sound data is the creeping start noise; when the driving torque < preset torque value, or the second-order moment root value corresponding to the vibration acceleration < preset calibration value, or the brake line pressure is not within the preset pressure interval, it is determined that the measured sound data is not the creeping start noise.

[0066] In one embodiment, the second-order moment root value corresponding to the vibration acceleration is obtained by: performing Fourier transform on the vibration acceleration to convert it into a first-order frequency domain signal; calculating the second-order moment root value of the first-order frequency domain signal within a preset frequency range. It should be noted that the vibration acceleration is collected in the time domain signal, which can be converted into a first-order frequency domain signal through Fourier transform (FFT). Since the frequency of creeping start noise is generally between 60Hz-100Hz, this is a range judgment basis, and therefore it is necessary to calculate the second-order moment root value of the first-order frequency domain signal within a preset frequency range (such as 60Hz-100Hz). The second-order moment root value can be understood as variance, which is a measure of the discreteness of vibration acceleration data. When creeping noise occurs, the vibration will suddenly change, i.e., a peak value, over a period of time. A preset calibration value (which can be an artificially created creeping noise measurement value as a standard) is used to measure whether the measured sound is creeping noise (if it is greater than or equal to the preset calibration value, it is one of the conditions for being judged as creeping noise, otherwise it is not). Therefore, the second-order moment root value is the basis for determining the occurrence of the second-order moment root value.

[0067] For example, more specifically, Figure 5As described, the current test duration is set to 1s, the driving force ≥ the preset torque value, which can be characterized as within the current 1s test duration, the vehicle speed ≤3km / h and the vehicle speed slope K ≥0, the second-order moment root value corresponding to the vibration acceleration ≥ the preset calibration value, that is, the second-order moment root value of the vibration acceleration at the first-order frequency of the creeping starting noise ≥ the preset calibration value, and the brake line pressure is in the preset pressure range, which can be characterized as the brake caliper hydraulic pressure is 3 to 7bar. The above measured data is when the pedal is in the depressed state, that is, within the 1s test duration, the brake pedal signal is in the "on" state.

[0068] It should be noted that Figure 5 This is merely an illustrative description and does not limit the embodiments of the present application.

[0069] It should also be noted that the preset calibration value, the preset torque value and the preset pressure range are empirical values, which can be obtained through test calibration of different vehicle models and are not specifically limited.

[0070] Through this embodiment, it is clear that the measured sound data is determined to be creeping start noise based on the brake line pressure, driving torque and vibration acceleration, which ensures the feasibility of the solution. In addition, it is also possible to refer to temperature parameters to determine whether it is creeping start noise, thereby referring to the influence of temperature factors on creeping start noise, which is not specifically limited.

[0071] In one embodiment, during the test, the acceleration sensor on the suspension includes one of the following acceleration sensors: an acceleration sensor on a brake caliper, an acceleration sensor on a lower arm, an acceleration sensor on a steering knot, an acceleration sensor on a steering tie rod, and an acceleration sensor on a shock absorber. Figure 2 For example, Figure 2 is a schematic diagram of the local structure of the test vehicle. Acceleration sensors are installed on the brake caliper, lower arm, steering knot, steering rod and shock absorber, so that the corresponding vibration acceleration data can be obtained through the installed acceleration sensors. It should be noted that in actual applications, the type and position of the installed acceleration sensor can be selected according to the test requirements, and there is no specific limitation. That is to say, in steps S10-S20, the received vibration acceleration data can be Figure 2 The vibration acceleration data collected by any one of the acceleration sensors shown is not specifically limited.

[0072] In one embodiment, during the test, the measured sound data is collected by a microphone installed at the wheel end or the headrest of the driver's seat.

[0073] It is worth noting that when multiple acceleration sensors are arranged, the data obtained by selecting or integrating suitable acceleration sensors is sent to the vehicle-mounted device, and the specific details are not limited. The creeping start noise can also be compared and determined based on the test results obtained under each acceleration sensor.

[0074] It can be seen that in this embodiment, by building part or all of the vibration acceleration on the suspension, the vibration acceleration at different positions on the suspension can be identified for use in determining the creeping start noise, providing multiple application test scenarios to make the test more convenient.

[0075] In one embodiment, the measured data includes brake line pressures and vibration accelerations corresponding to multiple rounds of tests, the brake line pressures in each round of the tests are different, and the same brake line pressure is maintained in the same round of the tests.

[0076] As an example, the test range of the brake line pressure is 3 bar to 20 bar, and a round of the test is performed every 1 bar. It should be noted that the test range and test interval of the brake line pressure are only for illustrative purposes and are not specifically limited.

[0077] In this embodiment, when conducting tests based on the creeping start noise test device, multiple rounds of tests can be repeated, and the brake line pressure under each round of the test is different. The same brake line pressure is maintained in the same round of the test, for example, each round of operation is performed and the line pressure is maintained, and a brake line pressure is maintained for each test, and the brake line pressure is increased from 3 bar to 20 bar and measured once at intervals of 1 bar. Among them, maintaining the brake line pressure in each round of the test can detect and identify the brake pressure section where the creeping start noise occurs, so as to obtain the creeping start noise characteristics and the causes of the creeping start noise under each different brake pressure section, expand the test application scenarios, provide more reference data for guiding the design, and comprehensively and effectively reduce the creeping start noise improvement design in each brake pressure section.

[0078] In one embodiment, after step S20, that is, after determining whether the measured sound data is creeping start noise according to the brake line pressure, the driving torque and the vibration acceleration, the method further includes:

[0079] S30: determining a brake line pressure-driving torque interval according to the test interval of the brake line pressure and the driving torque, wherein the brake line pressure-driving torque interval includes a range interval in which the creeping start noise is generated;

[0080] S40: Generate and output an output map corresponding to the brake line pressure-driving torque range, wherein a range range where the creeping start noise is generated and a range range where the creeping start noise is not generated are distinguished by different identifiers.

[0081] In this embodiment, multiple rounds of test have other functions, that is, after multiple rounds of test are conducted to obtain the corresponding creeping start noise test results in each round of test, the brake line pressure-driving torque interval can be determined according to the test interval of the brake line pressure and the driving torque, wherein the brake line pressure-driving torque interval includes the range interval for generating the creeping start noise, such as Figure 6 As shown, Figure 6 The horizontal axis represents the driving torque range (indicated by T), the vertical axis represents the brake line pressure range (indicated by P), and the two intervals with different shades represent the ranges where the creeping start noise is generated, and the darker gray represents the range with a larger creeping start noise, and the lighter gray represents the range with a smaller creeping start noise; and the non-shaded interval represents the range where the creeping start noise is not generated, which is distinguished by different symbols. Figure 6 The display is in the form of color, or other display methods, which are not specifically limited. Finally, an output diagram corresponding to the brake line pressure-driving torque interval can be generated and output.

[0082] In this embodiment, multiple rounds of tests are conducted while maintaining different brake line pressures. Maintaining the brake line pressure facilitates the detection and identification of creeping start noise. Different brake line pressures and driving torques form a matrix that can identify the brake line pressure, driving force and torque range that produces creeping start noise. The output diagram is intuitive, which makes it easier to add measures to avoid creeping start noise or to evaluate components such as friction plates during friction plate selection.

[0083] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0084] In one embodiment, a creeping start noise recognition device is provided, and the creeping start noise recognition device corresponds to the creeping start noise recognition method in the above embodiment. Figure 7 As shown, the creeping start noise recognition device includes a receiving module 101 and a determining module 102. The functional modules are described in detail as follows:

[0085] The receiving module 101 is used to receive measured data, wherein the measured data includes brake line pressure, driving torque, and vibration acceleration collected by an acceleration sensor on the suspension, wherein the measured data is data collected when the noise frequency of the measured sound data matches the acceleration sensor when the brake pedal of the vehicle is in a stepped state;

[0086] The determination module 102 is used to determine whether the measured sound data is creeping start noise according to the brake line pressure, driving torque and vibration acceleration.

[0087] In one embodiment, the determination module 102 is used to:

[0088] When the driving torque is greater than or equal to a preset torque value, the second-order moment root value corresponding to the vibration acceleration is greater than or equal to a preset calibration value, and the brake line pressure is within a preset pressure range, determining that the measured sound data is the creeping start noise;

[0089] When the driving torque is less than the preset torque value, or the second-order moment root value corresponding to the vibration acceleration is less than the preset calibration value, or the brake line pressure is not within the preset pressure range, it is determined that the measured sound data is not the creeping start noise.

[0090] In one embodiment, the second-order moment root value corresponding to the vibration acceleration is obtained by:

[0091] Performing Fourier transformation on the vibration acceleration to convert it into a first-order frequency domain signal;

[0092] Calculate the second-order root moment value of the first-order frequency domain signal within a preset frequency range.

[0093] In one embodiment, the measured data includes brake line pressures and vibration accelerations corresponding to multiple rounds of tests, the brake line pressures in each round of the tests are different, and the same brake line pressure is maintained in the same round of the tests.

[0094] In one embodiment, the test range of the brake line pressure is 3 bar to 20 bar, and a round of the test is performed at every 1 bar interval.

[0095] In one embodiment, the determination module 102 is further configured to:

[0096] Determining a brake line pressure-driving torque interval according to the test interval of the brake line pressure and the driving torque, wherein the brake line pressure-driving torque interval includes a range interval in which the creeping start noise is generated;

[0097] An output map corresponding to the brake line pressure-driving torque interval is generated and output, wherein the range interval generating the creeping start noise and the range interval not generating the creeping start noise are distinguished by different marks.

[0098] In one embodiment, the measured sound data is collected by a microphone installed at the wheel end or the headrest of the driver's seat.

[0099] In one embodiment, the acceleration sensor on the suspension includes one of the following acceleration sensors: an acceleration sensor on a brake caliper, an acceleration sensor on a lower control arm, an acceleration sensor on a steering knot, an acceleration sensor on a steering rod, and an acceleration sensor on a shock absorber.

[0100] It can be seen that in this embodiment, a creeping start noise identification device is provided. The creeping start noise identification device is based on a creeping start noise test device under a real vehicle. When the noise frequency of the measured sound data is matched with the vibration frequency of the vibration acceleration collected by the acceleration sensor, the corresponding brake line pressure, driving torque and vibration acceleration measured data are collected, and the creeping start noise is determined based on these data. It can be applied to the product development stage of automobile main engine manufacturers, from the adaptation of the input brake line pressure and the wheel end driving torque at the moment of starting / stopping, as well as for friction plates of different formulations and the main characteristics and occurrence conditions of creeping start noise under real vehicle conditions, which is conducive to the main engine manufacturers to carry out technical research and product problem solving, and to improve the design of creeping start noise from the pre-research and development stage, which has great application value.

[0101] The specific definition of the creeping start noise recognition device can be found in the definition of the creeping start noise recognition method above, which will not be repeated here. Each module in the creeping start noise recognition device can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a computer device in the form of software, such as a memory in a T-box device, so that the processor can call and execute operations corresponding to each of the modules above.

[0102] In one embodiment, an electronic device is provided, whose internal structure diagram can be as follows: Figure 8 As shown. The electronic device includes a processor, a memory, and a network interface connected through a system bus. Exemplarily, the electronic device can be a vehicle-mounted device, such as a T-box device, which is not specifically limited. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the controller includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The network interface of the processor is used to communicate with an actuator, etc. through a network connection to send actuator control parameters. When the computer program is executed by the processor, a method for identifying creeping start noise is implemented.

[0103] In one embodiment, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program:

[0104] Receiving measured data, the measured data including brake line pressure, driving torque, and vibration acceleration collected by an acceleration sensor on the suspension, wherein the measured data is data collected when the noise frequency of the measured sound data in the vehicle matches the acceleration sensor when the brake pedal of the vehicle is in a depressed state;

[0105] It is determined whether the measured sound data is creeping start noise according to the brake line pressure, the driving torque and the vibration acceleration.

[0106] In one embodiment, determining whether the measured sound data is creeping start noise according to the brake line pressure, the driving torque and the vibration acceleration includes:

[0107] When the driving torque is greater than or equal to a preset torque value, the second-order moment root value corresponding to the vibration acceleration is greater than or equal to a preset calibration value, and the brake line pressure is within a preset pressure range, determining that the measured sound data is the creeping start noise;

[0108] When the driving torque is less than the preset torque value, or the second-order moment root value corresponding to the vibration acceleration is less than the preset calibration value, or the brake line pressure is not within the preset pressure range, it is determined that the measured sound data is not the creeping start noise.

[0109] In one embodiment, the second-order moment root value corresponding to the vibration acceleration is obtained by:

[0110] Performing Fourier transformation on the vibration acceleration to convert it into a first-order frequency domain signal;

[0111] Calculate the second-order root moment value of the first-order frequency domain signal within a preset frequency range.

[0112] In one embodiment, the measured data includes brake line pressures and vibration accelerations corresponding to multiple rounds of tests, the brake line pressures in each round of the tests are different, and the same brake line pressure is maintained in the same round of the tests.

[0113] In one embodiment, the test range of the brake line pressure is 3 bar to 20 bar, and a round of the test is performed at every 1 bar interval.

[0114] In one embodiment, after determining whether the measured sound data is creeping start noise according to the brake line pressure, the driving torque and the vibration acceleration, the method further comprises:

[0115] Determining a brake line pressure-driving torque interval according to the test interval of the brake line pressure and the driving torque, wherein the brake line pressure-driving torque interval includes a range interval in which the creeping start noise is generated;

[0116] An output map corresponding to the brake line pressure-driving torque interval is generated and output, wherein the range interval generating the creeping start noise and the range interval not generating the creeping start noise are distinguished by different marks.

[0117] In one embodiment, the measured sound data is collected by a microphone installed at the wheel end or the headrest of the driver's seat.

[0118] In one embodiment, the acceleration sensor on the suspension includes one of the following acceleration sensors: an acceleration sensor on a brake caliper, an acceleration sensor on a lower control arm, an acceleration sensor on a steering knot, an acceleration sensor on a steering rod, and an acceleration sensor on a shock absorber.

[0119] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the creeping start noise recognition method mentioned in any of the above embodiments is implemented, which will not be repeated here.

[0120] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0121] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0122] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A creeping start noise recognition method, characterized in that: include: Receiving measured data, the measured data including brake line pressure, driving torque, and vibration acceleration collected by an acceleration sensor on the suspension, wherein the measured data is data collected when the noise frequency of the measured sound data in the vehicle matches the acceleration sensor when the brake pedal of the vehicle is in a depressed state; It is determined whether the measured sound data is creeping start noise according to the brake line pressure, the driving torque and the vibration acceleration.

2. The creeping start noise recognition method according to claim 1, characterized in that: The determining, based on the brake line pressure, the driving torque and the vibration acceleration, whether the measured sound data is creeping start noise comprises: When the driving torque is greater than or equal to a preset torque value, the second-order moment root value corresponding to the vibration acceleration is greater than or equal to a preset calibration value, and the brake line pressure is within a preset pressure range, determining that the measured sound data is the creeping start noise; When the driving torque is less than the preset torque value, or the second-order moment root value corresponding to the vibration acceleration is less than the preset calibration value, or the brake line pressure is not within the preset pressure range, it is determined that the measured sound data is not the creeping start noise.

3. The creeping start noise recognition method according to claim 2, characterized in that: The second-order moment root value corresponding to the vibration acceleration is obtained by: Performing Fourier transformation on the vibration acceleration to convert it into a first-order frequency domain signal; Calculate the second-order root moment value of the first-order frequency domain signal within a preset frequency range.

4. The creeping start noise recognition method according to claim 1, characterized in that: The measured data includes brake line pressures and vibration accelerations corresponding to multiple rounds of tests. The brake line pressures in each round of the tests are different, and the same brake line pressure is maintained in the same round of the tests.

5. The creeping start noise recognition method according to claim 4, characterized in that: The test range of the brake line pressure is 3 bar to 20 bar, and a round of the test is performed at every 1 bar interval.

6. The creeping start noise recognition method according to claim 4, characterized in that: After determining whether the measured sound data is creeping start noise according to the brake line pressure, the driving torque and the vibration acceleration, the method further includes: Determining a brake line pressure-driving torque interval according to the test interval of the brake line pressure and the driving torque, wherein the brake line pressure-driving torque interval includes a range interval in which the creeping start noise is generated; An output map corresponding to the brake line pressure-driving torque interval is generated and output, wherein the range interval generating the creeping start noise and the range interval not generating the creeping start noise are distinguished by different marks.

7. The creeping start noise recognition method according to claim 1, characterized in that: The measured sound data is collected by a microphone installed at the wheel end or the headrest of the driver's seat.

8. The creeping start noise recognition method according to any one of claims 1 to 7, characterized in that: The acceleration sensor on the suspension includes one of the following acceleration sensors: an acceleration sensor on a brake caliper, an acceleration sensor on a lower swing arm, an acceleration sensor on a steering knot, an acceleration sensor on a steering tie rod, and an acceleration sensor on a shock absorber.

9. A creeping start noise recognition device, characterized in that: include: A receiving module, used to receive measured data, wherein the measured data includes brake line pressure, driving torque, and vibration acceleration collected by an acceleration sensor on the suspension, wherein the measured data is data collected when the noise frequency of the measured sound data matches the acceleration sensor when the brake pedal of the vehicle is in a depressed state; The determination module is used to determine whether the measured sound data is creeping start noise according to the brake line pressure, driving torque and vibration acceleration.

10. A creeping start noise test device, characterized in that: The creep start noise test device comprises a test vehicle, which comprises vehicle-mounted equipment, a suspension and a brake pipeline; a vibration acceleration sensor is installed on the suspension, a pickup is installed in the test vehicle, and a pipeline pressure gauge is installed on the brake pipeline, wherein: The pickup is used to collect the measured sound data inside the test vehicle when the brake pedal is in the depressed state; The acceleration sensor is used to collect the vibration acceleration of the test vehicle when the brake pedal is in a depressed state; The pipeline pressure gauge is used to collect the brake pipeline pressure of the test vehicle when the brake pedal is in the depressed state; The vehicle-mounted device is used to receive measured data, the measured data including the brake line pressure, driving torque and vibration acceleration, wherein the measured data is data collected when the noise frequency of the measured sound data matches the acceleration sensor; based on the brake line pressure, driving torque and vibration acceleration, determine whether the measured sound data is creeping start noise.

11. The creeping start noise test device according to claim 10, characterized in that: The pickup is installed at the wheel end or the headrest of the main driver's seat.

12. The creeping start noise test device according to claim 10, characterized in that: The acceleration sensor on the suspension includes one of the following acceleration sensors: an acceleration sensor on a brake caliper, an acceleration sensor on a lower swing arm, an acceleration sensor on a steering knot, an acceleration sensor on a steering tie rod, and an acceleration sensor on a shock absorber.

13. The creeping start noise test device according to claim 10, characterized in that: The vehicle-mounted device includes a T-box device.

14. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the creeping start noise recognition method according to any one of claims 1 to 8 are implemented.

15. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the creeping start noise recognition method according to any one of claims 1 to 8 are implemented.

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