Method, device, equipment and storage medium for processing abnormal noise of vehicle powertrain bearing

Abstract

The present application discloses a method, device, equipment, and storage medium for processing abnormal noise from a vehicle powertrain bearing, and relates to the field of vehicle noise optimization technology. The method for processing abnormal noise from a vehicle powertrain bearing comprises: monitoring the current motor temperature when detecting that the main vehicle door is open; braking the wheel when the current motor temperature is lower than the target motor temperature, and controlling the motor for stall heating according to the target stall heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature. The present application can reduce abnormal noise from the powertrain bearing during low-temperature startup of a vehicle without increasing costs or changing the structural design, thereby improving driving comfort and vehicle reliability and enhancing the user experience, making the vehicle start and run smoother in cold weather.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle noise optimization, and in particular to a method, device, equipment and storage medium for processing abnormal noise of vehicle powertrain bearings. Background Art

[0002] As the new energy vehicle market continues to expand, consumers are increasingly demanding vehicle performance, especially in terms of comfort. Bearings, as a core component of the powertrain system of new energy vehicles, have a direct impact on the vehicle's noise, vibration, and harshness (NVH) performance. In low-temperature environments, the increased viscosity of the lubricant in the bearings reduces lubrication effectiveness, leading to frequent abnormal noise during startup. This is especially noticeable in pure electric driving mode, where the noise is more pronounced due to the lack of engine noise to mask it. This directly impacts the driving experience and overall vehicle performance.

[0003] In response to the problem of abnormal noise in the bearings of new energy vehicle powertrains at low temperatures, the industry has currently taken some optimization measures. These measures mainly include: ① Replacing lubricants or greases with better low-temperature performance; ② Improving lubrication effects at low temperatures through design improvements, such as expanding oil channels; ③ Adjusting the fit tolerance between bearings and bearing chambers. These methods can, to a certain extent, reduce or avoid abnormal noise in bearings during low-temperature startup.

[0004] While the aforementioned measures can alleviate bearing noise to a certain extent, they each have their own drawbacks. Replacing lubricants or grease increases vehicle maintenance costs; expanding oil passages and adjusting fit tolerances require structural design changes, which are difficult to implement late in product development and increase costs and development cycles. Furthermore, these methods may not be suitable for all vehicle models and may be inconsistent in practice. Therefore, reducing the noise associated with powertrain bearings during cold-temperature startup without increasing costs or requiring structural design changes has become a pressing issue.

[0005] The above content is only used to assist in understanding the technical solution of this application and does not constitute an admission that the above content is prior art. Summary of the Invention

[0006] The purpose of this application is to provide a method, device, equipment and storage medium for processing abnormal noise of vehicle powertrain bearings, aiming to solve the technical problem of how to reduce the abnormal noise of powertrain bearings when the vehicle is started at low temperature without increasing costs and changing the structural design.

[0007] To achieve the above objectives, the present application proposes a method for treating abnormal noise in a vehicle powertrain bearing, the method comprising:

[0008] When the main car door is detected to be open, the current motor temperature is monitored;

[0009] When the current motor temperature is lower than the target motor temperature, the wheel is braked, and the motor is controlled to perform locked-rotor heating according to the target locked-rotor heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature.

[0010] In one embodiment, when the current motor temperature is lower than the target motor temperature, braking the wheel and controlling the motor to perform locked-rotor heating according to the target locked-rotor heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature includes:

[0011] braking the wheels when the current motor temperature is lower than the target motor temperature;

[0012] When the wheel is braked, increasing the current motor temperature according to a preset direct-axis current value;

[0013] When the current motor temperature is greater than or equal to the target motor temperature, outputting the pulse width modulation signal is stopped.

[0014] In one embodiment, when the wheel is braked, the step of increasing the current motor temperature according to a preset direct-axis current value includes:

[0015] When the wheel is braked, a current control signal is generated according to a preset direct-axis current value;

[0016] generating a pulse width modulation signal according to the current control signal;

[0017] The pulse width modulation signal is sent to the direct axis winding of the motor to increase the current motor temperature.

[0018] In one embodiment, before the step of braking the wheel when the current motor temperature is lower than the target motor temperature and controlling the motor to perform locked-rotor heating according to the target locked-rotor heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature, the method further includes:

[0019] Measuring the noise inside the vehicle by means of a microphone, wherein the microphone is mounted on a seat inside the vehicle;

[0020] Measuring the vibration amplitude of the powertrain by an acceleration sensor, wherein the acceleration sensor is installed on the electric drive assembly or the hybrid powertrain;

[0021] When the in-vehicle noise is less than a preset noise value and the powertrain vibration amplitude is less than a preset vibration amplitude, the current motor temperature is acquired and used as the target motor temperature.

[0022] In one embodiment, before the step of monitoring the current motor temperature when detecting that the driver's door is opened, the method further includes:

[0023] Acquiring in-vehicle noise data through the microphone;

[0024] Acquiring powertrain vibration and noise data through the acceleration sensor;

[0025] Performing order analysis on the powertrain vibration and noise data to obtain abnormal noise orders;

[0026] When the powertrain vibration noise data corresponds to the in-vehicle noise data and the abnormal noise order is a powertrain bearing order, it is determined that the vehicle has abnormal noise from the powertrain bearing.

[0027] In one embodiment, before the step of braking the wheel when the current motor temperature is lower than the target motor temperature and controlling the motor to perform locked-rotor heating according to the target locked-rotor heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature, the method further includes:

[0028] Sending a shift command to the transmission system to put the vehicle into park;

[0029] When the vehicle enters a parking gear, sending a motor power adjustment instruction to a motor control unit so that the motor control unit increases the motor power;

[0030] When the in-vehicle noise is greater than or equal to the preset noise value, the current motor power is obtained and used as the target locked-rotor heating power.

[0031] In one embodiment, before the step of braking the wheel when the current motor temperature is lower than the target motor temperature and controlling the motor to perform locked-rotor heating according to the target locked-rotor heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature, the method further includes:

[0032] When the current motor temperature is lower than the target motor temperature, the motor locked-rotor heating time is calculated according to the current motor temperature, the target motor temperature and the target locked-rotor heating power;

[0033] Sending the motor stall heating time to an instrument panel, so that the instrument panel provides a prompt according to the first preset prompt content and the motor stall heating time;

[0034] When the current motor temperature is greater than or equal to the target motor temperature, a display update instruction is sent to the instrument panel, so that the instrument panel prompts according to the second preset prompt content.

[0035] In addition, to achieve the above-mentioned purpose, the present application also proposes a device for processing abnormal noise of a vehicle powertrain bearing, the device comprising:

[0036] The temperature monitoring module is used to monitor the current motor temperature when it detects that the main driving door is open;

[0037] The stall heating module is used to brake the wheel when the current motor temperature is lower than the target motor temperature, and control the motor to perform stall heating according to the target stall heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature.

[0038] In addition, to achieve the above-mentioned purpose, the present application also proposes a device for processing abnormal noise of vehicle powertrain bearings, which includes: a memory, a processor, and a computer program stored on the memory and runnable on the processor, and the computer program is configured to implement the steps of the method for processing abnormal noise of vehicle powertrain bearings as described above.

[0039] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium. A computer program is stored on the storage medium. When the computer program is executed by the processor, the steps of the method for processing abnormal noise of the vehicle powertrain bearing are implemented as described above.

[0040] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the steps of the method for processing abnormal noise of vehicle powertrain bearings as described above.

[0041] One or more technical solutions proposed in this application have at least the following technical effects:

[0042] When it is detected that the main driving door is open, the current motor temperature is monitored; when the current motor temperature is lower than the target motor temperature, the wheel is braked, and the motor is controlled to perform stall heating according to the target stall heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature. When the on-board system detects that the main driving door is opened, it will start the temperature monitoring program to check the current temperature of the motor. This is because in a low temperature environment, the motor and its bearings need to be preheated to ensure good lubrication and reduce abnormal noise during startup. If the current motor temperature is lower than the preset target motor temperature, the system will issue a command to brake the wheel and adjust the motor power through the motor control unit (MCU) to put the motor into a stalled state. This can use the heat generated by the motor itself to heat the electric drive assembly or hybrid powertrain, increase the temperature of the motor and its surrounding components, thereby reducing bearing wear and damage caused by low temperatures, reducing maintenance costs, and improving energy efficiency. The system continuously monitors and adjusts the motor's stalled-rotor heating process until the motor temperature reaches or exceeds the target motor temperature. This process reduces abnormal noise from the powertrain bearings during low-temperature startup without increasing costs or making structural design changes. This not only improves driving comfort and vehicle reliability, but also enhances the user experience, making vehicle startup and operation smoother in cold weather. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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.

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0045] Figure 1 A flow chart of the first embodiment of the method for treating abnormal noise of a vehicle powertrain bearing of the present application;

[0046] Figure 2 A schematic diagram comparing abnormal bearing noise in cold and hot engine states, provided in Example 1 of the method for treating abnormal bearing noise in a vehicle powertrain of the present application;

[0047] Figure 3 A flow chart illustrating a second embodiment of the method for treating abnormal noise in a vehicle powertrain bearing of the present application;

[0048] Figure 4 This is a schematic diagram of the module structure of a device for processing abnormal noise of a vehicle powertrain bearing according to an embodiment of the present application;

[0049] Figure 5 Schematic diagram of the equipment structure of the hardware operating environment involved in the method for processing abnormal noise of vehicle powertrain bearings in an embodiment of the present application.

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

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

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

[0053] With the growth of the new energy vehicle market, consumers are demanding more comfort in their vehicles, with a particular focus on the NVH performance of bearings in the powertrain system. In low-temperature environments, the lubrication effectiveness of bearings decreases, leading to abnormal noise during startup, which is especially noticeable in pure electric mode and seriously affects the driving experience. To address this issue, the industry has implemented optimization measures, such as using lubricants / greases with better low-temperature performance, improving oil channel design to enhance lubrication, and adjusting bearing fit tolerances. However, these measures increase maintenance costs, involve structural changes that lead to increased development difficulty and cost, may not be applicable to all models, and the actual results are also unstable.

[0054] The main solution of the embodiment of the present application is: when it is detected that the main driving door is opened, the vehicle system will check the motor temperature. If it is lower than the preset value, the system will brake the wheel and adjust the motor power to put the motor into a stalled state, and use the heat generated by itself to preheat the motor and bearings, reducing wear and abnormal noise caused by low temperature. The system continuously monitors and adjusts the heating process until the motor temperature reaches the target value, thereby reducing maintenance costs and improving energy efficiency.

[0055] It should be noted that the execution subject of the embodiments of the present application may be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, mobile phone, etc., or an electronic device or in-vehicle system capable of implementing the above functions. The following uses an in-vehicle system as an example to illustrate this embodiment and the following embodiments.

[0056] Based on this, the embodiment of the present application provides a method for processing abnormal noise of a vehicle powertrain bearing, referring to Figure 1 , Figure 1 This is a flow chart of a first embodiment of a method for treating abnormal noise in a vehicle powertrain bearing of the present application.

[0057] In this embodiment, the method for processing abnormal noise of a vehicle powertrain bearing includes steps S10 to S20:

[0058] Step S10, when it is detected that the main driving door is open, monitoring the current motor temperature;

[0059] It should be noted that the main driver's door refers to the door on the driver's side of the vehicle. This is the main operating entrance in the vehicle and is usually located on the left side (for left-hand drive vehicles) or right side (for right-hand drive vehicles) of the vehicle. In new energy vehicles, when the main driver's door is detected to be open, it usually means that the driver is about to enter the vehicle and prepare to start the vehicle or drive. Therefore, the system will start to detect the motor temperature at this moment so that appropriate measures can be taken according to the temperature conditions, such as motor heating to optimize the vehicle's low-temperature starting performance. The current motor temperature refers to the actual temperature of the motor in the powertrain of new energy vehicles. The motor temperature is a key parameter because it is directly related to the lubrication performance and abnormal noise of the bearing. When the motor temperature is lower than the preset target motor temperature, the lubrication effect of the bearing will deteriorate due to the increased viscosity of the lubricating oil or grease, which may cause abnormal noise. Therefore, monitoring the current motor temperature is crucial to determine whether to initiate the heating process to improve lubrication performance and avoid abnormal noise.

[0060] As you can see, first, when the vehicle's door sensor detects the driver's door being opened, it activates a pre-set program to initiate motor temperature monitoring. Secondly, the system uses the temperature sensor built into the motor to accurately measure and record real-time motor temperature data. This data is crucial for assessing the bearing's lubrication status and predicting the possibility of abnormal noise.

[0061] Step S20 , when the current motor temperature is lower than the target motor temperature, braking the wheel, and controlling the motor to perform locked-rotor heating according to the target locked-rotor heating power and the target motor temperature, until the current motor temperature is greater than or equal to the target motor temperature.

[0062] It should be noted that the target motor temperature refers to a preset motor temperature threshold to prevent abnormal noise from the powertrain bearings of new energy vehicles at low temperatures. When the motor temperature falls below this critical value, the lubrication performance of the bearings will decrease, which can easily cause abnormal noise. Therefore, the target motor temperature is a key parameter to ensure good bearing lubrication and avoid abnormal noise. It is determined through experiments and tests. That is, under different operating conditions, when the motor temperature rises to a certain value, the abnormal bearing noise will decrease to the preset target value. This specific value is the target motor temperature. Braking the wheel refers to braking the wheel through the brake system to stop the wheel from rotating. This is done to increase the temperature of the motor and its surrounding components through motor stall heating when the vehicle is parked, thereby improving the lubrication performance of the bearings. In actual operation, wheel braking may be achieved through the electronic braking system or manual braking by the driver. Stalled-rotor heating is a heating method that allows the motor to output torque even when the speed is zero. In this state, the motor's rotor cannot rotate due to braking. However, a specific current (usually direct-axis (ID) current without quadrature-axis (IQ) current) is fed into the motor, causing iron and copper losses within the motor, which in turn generates heat. This heating method rapidly raises the motor's temperature, which is then transferred to the electric or hybrid powertrain through the cooling system, improving bearing lubrication. Stalled-rotor heating is an effective method for controlling motor temperature, resolving the issue of abnormal bearing noise during low-temperature startup without incurring additional costs or structural design changes.

[0063] It's understandable that, first, the onboard system detects through a temperature sensor that the motor's real-time temperature is lower than the set target motor temperature. This target temperature is designed to ensure that the bearings don't produce abnormal noise during startup due to insufficient lubrication caused by low temperatures. Secondly, the system sends a signal to the vehicle's braking system to apply brake pressure, thereby braking the wheels. This is done to heat the motor when the vehicle is stationary, using the heat generated by the motor's stalled rotor. Because when the wheels are braked, even if the motor outputs torque, the wheels won't rotate, and in this state, the motor will generate heat. The system then uses a preset target stalled rotor heating power. This power is the optimal heating power experimentally determined without damaging the motor or generating excessive noise. The system then sends a command to the motor controller, causing the motor to output torque without rotating. This generates additional heat within the motor, which is transferred to the electric drive or hybrid powertrain through the motor's cooling system, thereby increasing the temperature of the entire powertrain. Finally, the system will continue to monitor the motor temperature until the motor temperature reaches or exceeds the target motor temperature. At this time, the motor's stall heating process will stop. The effect of this is that by precisely controlling the motor's stall heating, the temperature of the motor and its surrounding components can be quickly increased without adding additional costs or structural changes, the lubrication condition of the bearings can be improved, abnormal noise during low-temperature startup can be reduced or eliminated, the vehicle's NVH performance can be improved, and driving comfort and powertrain reliability can be ensured.

[0064] As an example, when the current motor temperature is lower than the target motor temperature, the wheel is braked, and the motor is controlled to perform stall heating according to the target stall heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature. Before the step, the method also includes: measuring the noise inside the vehicle by a microphone, and the microphone is installed on the seat inside the vehicle; measuring the vibration amplitude of the powertrain by an acceleration sensor, and the acceleration sensor is installed on the electric drive assembly or the hybrid powertrain; when the noise inside the vehicle is less than a preset noise value and the vibration amplitude of the powertrain is less than a preset vibration amplitude, obtaining the current motor temperature and using the current motor temperature as the target motor temperature.

[0065] A microphone refers to a sound measuring device used to capture and record the noise inside the car. In this solution, the microphone is installed on the seat inside the car in order to accurately measure the noise level inside the car, especially the noise generated when the powertrain of a new energy vehicle is running. The noise inside the car refers to the sound level that can be heard inside the vehicle, including noise generated by various factors such as the powertrain, tires, wind noise, etc. In new energy vehicles, due to the lack of engine noise masking, the noise inside the car mainly comes from the operation of the motor and powertrain. The noise level inside the car is an important indicator for measuring vehicle comfort and NVH performance. An accelerometer is a sensor that detects the acceleration of an object. It can measure the vibration amplitude of the powertrain during operation. In this embodiment, the accelerometer is installed on the electric drive assembly or hybrid powertrain for real-time monitoring and recording of the vibration of the powertrain, which is crucial for diagnosing and optimizing the NVH performance of the powertrain. Powertrain vibration amplitude refers to the intensity of vibration generated by the powertrain during operation. Vibration amplitude is a key factor affecting vehicle comfort and component durability. Excessive vibration can cause problems such as unusual noise and component wear. By measuring vibration amplitude, the operating status of the powertrain can be assessed and appropriate optimization measures can be taken. The electric drivetrain refers to the electric motor and its related components responsible for driving the vehicle in a new energy vehicle, including the motor and electronic control system. The electric drivetrain is one of the core components of new energy vehicles, and its performance directly affects the vehicle's power output and energy consumption. The hybrid powertrain refers to the core components of a hybrid system that uses both an electric motor and an internal combustion engine as power sources, including the electric motor, the internal combustion engine, and the energy management system between them. The hybrid powertrain combines the advantages of electric motors and internal combustion engines to improve fuel efficiency and reduce emissions. The preset noise level is a pre-set noise level threshold based on vehicle design and performance requirements. For example, the preset noise level could be a noise level of no more than 65 decibels (dB) inside the vehicle. This is to ensure vehicle comfort and compliance with relevant noise standards during driving. The preset vibration amplitude refers to a vibration intensity threshold set in advance according to the vehicle design and performance requirements. For example, the preset vibration amplitude can be that the powertrain vibration does not exceed 0.5G (unit of gravity acceleration). This is to ensure the stability of the powertrain and reduce component wear or abnormal noise caused by excessive vibration. By comparing the actually measured in-vehicle noise and powertrain vibration amplitude with these preset values, it can be determined whether the vehicle needs further temperature control and NVH optimization.

[0066] First, the vehicle's system activates a microphone mounted on a seat in the vehicle. This device accurately captures the sounds inside the vehicle and measures the noise level in real time. This is to assess whether the acoustic environment of the vehicle during operation meets the preset comfort standards. Secondly, the system simultaneously activates an accelerometer mounted on the electric drive or hybrid powertrain. This sensor monitors and records the vibration amplitude of the powertrain in real time to ensure the operational stability of the powertrain and predict possible mechanical problems. The system then compares the actual measured values ​​of the interior noise and powertrain vibration amplitude with the preset target values. If the interior noise is less than the preset noise value and the powertrain vibration amplitude is less than the preset vibration amplitude, it indicates that the vehicle's NVH performance is in good condition. At this point, the system will obtain and record the current motor temperature. Finally, the system sets the real-time measured motor temperature as the target motor temperature and stores it in the vehicle system. This temperature value will be used to control the motor's stall heating process to ensure that when starting in a low-temperature environment, the temperature of the motor and its surrounding components can quickly reach an optimal operating temperature that can avoid abnormal bearing noise. This can improve vehicle comfort and reliability by precisely controlling the motor temperature without adding additional costs or structural changes, reducing or eliminating abnormal noise during low-temperature startup.

[0067] In addition, the target motor temperature can also be obtained by performing a whole-vehicle vibration and noise test using a new energy vehicle powertrain vibration and noise test system (i.e., the microphone and accelerometer can be installed on the vehicle and regarded as part of the vehicle, or the new energy vehicle powertrain vibration and noise test system can be regarded as independent of the vehicle and can be removed at any time). The new energy vehicle powertrain vibration and noise test system includes: a microphone installed on a seat in the vehicle and an accelerometer installed on an electric drive assembly or a hybrid powertrain. The microphone and accelerometer are connected to a vibration and noise data acquisition front end via a cable. The vehicle CAN bus OBD diagnostic port is connected to the vibration and noise data acquisition front end and the host computer respectively via a one-to-two OBD adapter cable. The vibration and noise data acquisition front end is connected to a computer to form a new energy vehicle powertrain vibration and noise test system. The system can collect vehicle powertrain vibration and noise data, motor speed, motor torque and motor temperature while adjusting the motor control strategy.

[0068] As an example, when it is detected that the main driving door is opened, before the step of monitoring the current motor temperature, it also includes: obtaining in-vehicle noise data through the microphone; obtaining powertrain vibration noise data through the acceleration sensor; performing order analysis on the powertrain vibration noise data to obtain abnormal sound order; when the powertrain vibration noise data corresponds to the in-vehicle noise data and the abnormal sound order is the powertrain bearing order, it is determined that the vehicle has abnormal powertrain bearing noise.

[0069] Interior noise data refers to sound signals captured by microphones installed inside the vehicle and is used to assess the noise level inside the vehicle. This data, including information such as noise intensity and frequency, is used for subsequent noise source identification and problem diagnosis. Powertrain vibration and noise data refers to vibration data collected by accelerometers installed on the electric drive or hybrid powertrain. This data reflects the vibration generated by the powertrain during operation, including amplitude and frequency. This information is crucial for identifying internal powertrain issues, such as bearing noise. Order analysis is a technique that decomposes vibration or noise signals into different frequency components, particularly useful for identifying periodic variations in rotating machinery. In this embodiment, order analysis is used to process powertrain vibration and noise data to identify vibration frequencies specific to the powertrain bearings, namely, noise orders. Noise orders refer to specific vibration frequencies obtained through order analysis. This frequency is associated with the rotational speed of the powertrain bearings. If the interior noise data and the powertrain vibration and noise data exhibit a peak at the same frequency, and this frequency matches the rotational order of the bearings, then this frequency is the noise order. The powertrain bearing order refers to the specific vibration frequency directly related to the rotation of the powertrain bearing. Each bearing has its own unique order, which depends on the bearing design and rotation speed. When a problem occurs with the powertrain bearing, abnormal vibration will occur at its specific order. Powertrain bearing abnormal noise refers to abnormal sound caused by physical damage, poor lubrication or other problems with the powertrain bearing. This abnormal noise is usually related to the specific order of the bearing and can be identified through the correspondence between the in-vehicle noise data and the powertrain vibration noise data. When the on-board system confirms through analysis that there is an abnormal noise order that matches the powertrain bearing order, it can be determined that the vehicle has a powertrain bearing abnormal noise problem. Such a judgment helps to diagnose and repair potential mechanical failures in a timely manner to avoid further damage and improve vehicle reliability.

[0070] First, the on-board system (which can also use a new energy vehicle powertrain vibration and noise test system) uses an in-vehicle microphone to collect acoustic signals inside the vehicle and converts these analog signals into digital data, generating in-vehicle noise data. This accurately captures and records the in-vehicle acoustic environment. Second, the system uses accelerometers mounted on the powertrain to collect vibration data generated during operation. This data is converted into digital form, generating powertrain vibration and noise data for subsequent analysis of the powertrain's vibration characteristics. The system then performs order analysis on the collected powertrain vibration and noise data. This technique decomposes complex vibration signals into distinct frequency components. This analysis identifies specific vibration frequencies, known as abnormal noise orders, to identify and locate the possible source of the abnormal noise. Finally, after obtaining the abnormal noise orders, the system compares these orders with the in-vehicle noise data. If the in-vehicle noise data contains frequencies that match the powertrain vibration and noise data, and if these frequencies are orders specific to powertrain bearings, the system determines that the vehicle has abnormal powertrain bearing noise. This process can accurately diagnose whether the powertrain bearings are producing abnormal noise due to wear, damage or poor lubrication, so that timely repairs or replacements can be carried out to ensure the normal operation of the vehicle and the comfort of passengers.

[0071] The motor speed and torque corresponding to all working conditions where abnormal noise from the low-temperature bearing occurs are recorded, and the summary results are shown in the following table.

[0072] Low temperature bearing abnormal noise working condition table

[0073] Motor torque Motor speed range Working condition 1 T1 N1b-N1e Working condition 2 T2 N2b-N2e ... ... ... Working condition n Tn Nnb-Nne

[0074] Please refer to Figure 2 , Figure 2The first embodiment of the method for treating abnormal bearing noise in a vehicle powertrain of the present application provides a schematic diagram comparing abnormal bearing noise in cold and hot engine states. The diagram shows a comparison of the frequency spectra of the interior noise and the vibration of the entire vehicle motor in the cold and hot engine states of a new energy vehicle. The horizontal axis of the diagram represents frequency, in Hertz (Hz). Frequency describes the number of periodic changes in vibration or sound waves per unit time. In this diagram, the horizontal axis shows noise and vibration data at different frequencies, which is used to analyze the distribution of interior noise and motor vibration at different frequencies. The vertical axis represents motor speed, in revolutions per minute (rpm). In a spectrum diagram, the vertical axis is usually used to show the changes in the signal within the motor's operating speed range. In this diagram, the vertical axis represents the motor's operating speed range, which is used to observe the changes in the noise and vibration spectrum at different speeds. In addition, the color coding in the diagram represents the intensity of the noise or vibration, usually expressed in decibels (dB) or acceleration (g). The higher the value on the color bar, the greater the noise or vibration intensity at that frequency and time point. This color coding makes it possible to visually identify peak areas of noise and vibration, and how they vary with motor speed and frequency.

[0075] In the cold engine state, the figure shows the spectrum of the noise and vibration inside the vehicle when the motor is started at low temperature. There is a clear noise peak at 480Hz-560Hz, which corresponds to the 7.2-order abnormal noise of the motor speed (7.2-order is twice the order of a certain bearing of the motor), indicating that the abnormal noise of the bearing is more significant in the cold engine state. In the hot engine state, as the motor temperature increases, the bearing lubrication performance is improved. In the spectrum of the noise and vibration inside the vehicle, the 7.2-order noise peak is significantly weakened or disappears. This is consistent with the technical solution of this embodiment, that is, the motor temperature is quickly increased by motor stall heating, and the heat is transferred to the electric drive assembly or hybrid powertrain through the cooling system, thereby improving the bearing lubrication performance and avoiding the occurrence of low-temperature bearing abnormal noise. This comparison clearly demonstrates the effectiveness of the optimization method in reducing bearing abnormal noise during low-temperature startup, and achieves the improvement of the vehicle's NVH performance and driving comfort through intelligent temperature management without increasing costs and changing structural design.

[0076] As an example, when the current motor temperature is lower than the target motor temperature, the wheel is braked, and the motor is controlled to perform stall heating according to the target stall heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature. The step also includes: sending a shift instruction to the transmission system to make the vehicle enter the parking gear; when the vehicle enters the parking gear, sending a motor power adjustment instruction to the motor control unit to make the motor control unit increase the motor power; when the noise inside the vehicle is greater than or equal to the preset noise value, obtaining the current motor power, and using the current motor power as the target stall heating power.

[0077] A shift command is a control signal sent by the onboard system to the vehicle's drivetrain, instructing the vehicle to change gears. In vehicles with automatic transmissions, a shift command tells the transmission control system to shift to a specific gear, such as from Drive to Park. The drivetrain refers to the series of mechanical components in a vehicle responsible for transmitting engine (or motor) power to the drive wheels. This includes components such as the transmission, driveshaft, and differential, working together to ensure efficient power delivery based on driving conditions. Park (P) is a gear in an automatic transmission that locks the drivetrain when the vehicle is parked, preventing it from moving. When in Park, the transmission is mechanically locked, preventing the drive wheels from rotating. A motor power adjustment command is a signal sent to the motor control unit, instructing it to adjust the motor's output power. This command can increase or decrease the motor's power output to adapt to different driving demands or vehicle conditions. The Motor Control Unit (MCU) is a key electronic control unit in new energy vehicles, responsible for managing the operation of the motor, including starting and stopping, speed, and power output, and precisely controlling its operating state. Current motor power refers to the actual output power of the motor at a certain moment, reflecting the energy output level of the motor at a specific point in time. It is usually measured in watts (W) or kilowatts (kW). Motor power is a key factor affecting vehicle performance and energy consumption.

[0078] First, the onboard system sends a shift command to the transmission, instructing the vehicle to shift into park. This ensures the vehicle is safely parked and prevents movement during motor stall heating. Second, the system sends a motor power adjustment command to the motor control unit, instructing the MCU to increase the motor's output power for stall heating. Then, as the motor power increases, the system monitors the interior noise. If the interior noise reaches or exceeds a preset value, this indicates that the motor has reached a suitable operating point. Finally, the current motor power is obtained and set as the target stall heating power. This power value is used to control the motor's power output during stall heating until the motor temperature reaches the target motor temperature. This ensures that the motor is heated within a safe power range while avoiding excessive noise, ensuring the safety and comfort of the vehicle and passengers.

[0079] In addition, the target stall heating power can also be obtained in advance by conducting a whole vehicle vibration and noise test using a new energy vehicle powertrain vibration and noise test system.

[0080] As an example, when the current motor temperature is lower than the target motor temperature, the wheel is braked, and the motor is controlled to perform stall heating according to the target stall heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature. The step also includes: when the current motor temperature is lower than the target motor temperature, the motor stall heating time is calculated according to the current motor temperature, the target motor temperature and the target stall heating power; the motor stall heating time is sent to the instrument panel so that the instrument panel prompts according to the first preset prompt content and the motor stall heating time; when the current motor temperature is greater than or equal to the target motor temperature, a display update instruction is sent to the instrument panel so that the instrument panel prompts according to the second preset prompt content.

[0081] The motor stall heating time refers to the length of time from the start of stall heating until the motor reaches the target motor temperature. This time is calculated based on the current motor temperature, the target motor temperature, and the target stall heating power. It determines how long the motor needs to heat up to a temperature sufficient to improve bearing lubrication and prevent low-temperature noise. The instrument panel refers to the control panel inside the vehicle that displays various vehicle information and warnings. It typically includes the speedometer, tachometer, fuel gauge, temperature gauge, and other indicators and displays, providing the driver with vehicle status information. The first preset prompt content refers to the prompt information pre-set by the vehicle system during the stall heating process. This information is displayed to the driver on the instrument panel. This information may include the cause of motor heating, the estimated heating time, and the current heating power, so that the driver understands the current vehicle status and upcoming operations. For example, due to low temperatures, to ensure driving performance, the vehicle will enter the self-heating state and provide a heating time, asking the driver to wait patiently. The display update command is a signal sent by the vehicle system to the instrument panel to instruct it to update its display. When the motor temperature reaches the target temperature, the system sends this command, allowing the instrument panel to switch the display content and provide new information or prompts. The second preset prompt content refers to another set of prompt information pre-set by the vehicle system after the motor temperature reaches the target motor temperature. This information is also displayed to the driver through the instrument panel. This may include prompting the driver that motor heating is complete, the vehicle is ready to drive, or it is safe to start the vehicle.

[0082] Before the motor reaches the target motor temperature, the onboard system calculates the specific time required for motor stall heating based on the motor's current temperature, target temperature, and target stall heating power. This calculation, the motor stall heating time, is sent to the instrument panel. In this embodiment, the onboard system controls the motor stall heating by sending a stall heating command to the motor control unit. The onboard system calculates the heating time before sending the stall heating command and sends the heating time to the instrument panel after sending the stall heating command. The instrument panel then provides the driver with a prompt based on this data and a first preset prompt (e.g., "Due to the low temperature, to ensure vehicle performance, the vehicle will enter self-heating mode and a heating time is provided. Please be patient."). When the motor temperature reaches the target temperature, the onboard system sends a display update command to the instrument panel, causing it to update the display based on a second preset prompt (e.g., "Vehicle heating is complete and can be driven normally"), notifying the driver that the motor heating process has concluded and the vehicle is ready for safe driving. This process ensures that the driver receives necessary information throughout the heating process, improving driving safety and comfort.

[0083] This embodiment provides a method for handling abnormal noise in a vehicle powertrain bearing. When it is detected that the main driving door is open, the current motor temperature is monitored; when the current motor temperature is lower than the target motor temperature, the wheel is braked, and the motor is controlled to perform stall heating according to the target stall heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature. When the vehicle system detects that the main driving door is opened, it will start a temperature monitoring program to check the current temperature of the motor. This is because in a low temperature environment, the motor and its bearings need to be preheated to ensure good lubrication and reduce abnormal noise during startup. If the current motor temperature is lower than the preset target motor temperature, the system will issue a command to brake the wheel and adjust the motor power through the motor control unit (MCU) to put the motor into a stalled state. This can use the heat generated by the motor itself to heat the electric drive assembly or hybrid powertrain, increase the temperature of the motor and its surrounding components, thereby reducing bearing wear and damage caused by low temperature, reducing maintenance costs, and improving energy efficiency. The system continuously monitors and adjusts the motor's stalled-rotor heating process until the motor temperature reaches or exceeds the target motor temperature. This process reduces abnormal noise from the powertrain bearings during low-temperature startup without increasing costs or making structural design changes. This not only improves driving comfort and vehicle reliability, but also enhances the user experience, making vehicle startup and operation smoother in cold weather.

[0084] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above embodiment 1 can be referred to the above introduction and will not be described in detail later. Figure 3 , Figure 3 This is a flow chart of a second embodiment of the method for treating abnormal noise in a vehicle powertrain bearing of the present application. Step S20 of the method for treating abnormal noise in a vehicle powertrain bearing includes steps S21 to S23:

[0085] Step S21, braking the wheel when the current motor temperature is lower than the target motor temperature;

[0086] It is understood that when the vehicle system detects through the temperature sensor that the current motor temperature is lower than the preset target motor temperature, it will initiate a safety protocol, that is, send a command to the vehicle's brake system to brake the wheel. This step involves the transmission of electronic signals from the vehicle system's control unit to the brake system's actuator, causing the brake caliper to clamp the brake disc or brake drum, generating friction, thereby preventing the wheel from rotating. The purpose of doing this is to allow the next step of the motor stall heating process to be carried out when the vehicle is stationary. Because when the wheel is braked, even if the motor attempts to rotate the wheel, the wheel will remain stationary due to the braking effect. This allows the motor to generate heat without actually rotating, ensuring that the vehicle will not move unexpectedly during the motor heating process, protecting the safety of passengers and the vehicle.

[0087] Step S22, when the wheel is braked, increasing the current motor temperature according to a preset direct-axis current value;

[0088] It should be noted that the preset direct-axis current value refers to a current parameter pre-set in the motor control. This parameter is specifically used to control the direct-axis current of the motor during the motor stall (i.e., wheel braking) heating process. The direct-axis current is one of the current components used to generate torque in motor control, but during the stall heating process, it is used to generate heat rather than torque, for example, 50 amperes (A).

[0089] It is understandable that when the wheel is braked, the motor control unit (MCU) of the vehicle system will adjust the direct-axis current value of the motor according to pre-set parameters to increase the current motor temperature. Specifically, the MCU will send a precise current control signal to the motor, such as setting the direct-axis current value to 50 amperes. This value is determined through calculation and testing and can generate sufficient heat without damaging the motor. When the motor receives this signal, its internal direct-axis current will increase to the set value, resulting in an increase in the copper loss and iron loss of the motor. These losses are released in the form of heat, causing the temperature of the motor to rise. This method of generating heat by increasing the direct-axis current is a safe and effective way to quickly increase the temperature of the motor and its surrounding components when the wheel is braked and the motor cannot rotate, so as to optimize the lubrication state of the bearings, reduce abnormal noise during low-temperature startup, and improve the comfort and reliability of the vehicle.

[0090] As an example, the step of increasing the current motor temperature according to a preset direct-axis current value when the wheel is braked includes: generating a current control signal according to a preset direct-axis current value when the wheel is braked; generating a pulse width modulation signal according to the current control signal; and sending the pulse width modulation signal to the direct-axis winding of the motor to increase the current motor temperature.

[0091] A current control signal is an electronic signal generated by the motor control unit based on a preset direct-axis current value. This signal instructs the motor's power electronics to adjust the motor's current supply. The current control signal is generated based on the preset direct-axis current value. This value is used to increase the motor temperature through motor stall heating during wheel braking. The current control signal ensures that the motor receives the correct current to generate the required heat energy. A pulse-width modulated signal (PWM signal) is a periodic signal characterized by adjusting the output voltage or average current by varying the pulse width. In motor control, PWM signals are used to precisely control the motor's power electronics, such as the inverter, to adjust the current flowing to the motor. Pulse-width modulation allows for fine control of the motor's speed and torque. In this scenario, it is also used to control the current during motor stall heating to precisely increase the motor temperature. The direct-axis winding refers to a component inside the motor. It is a set of windings on the motor stator that interacts with the motor's magnetic field to generate braking torque or heat. In motor control theory, the direct axis and the quadrature axis are two orthogonal coordinate axes used to describe the relationship between the motor's magnetic field and current. In this embodiment, the direct-axis winding specifically refers to those windings that generate heat by increasing the direct-axis current when the wheel is braked, thereby increasing the motor temperature.

[0092] When the wheels brake, the onboard system first generates a current control signal based on the preset direct-axis current value. This signal is used by the motor control unit to instruct the motor's power electronics on how to adjust the motor's current supply. Next, the MCU converts this current control signal into a pulse-width modulation signal, a technique that controls the current by adjusting the duration of the pulse, allowing for precise control of the current in the motor winding. Finally, the MCU sends the PWM signal to the motor's direct-axis winding, causing current to flow through the winding and generate heat, thereby increasing the motor's temperature. This process involves precise electronic control to ensure that when the wheels brake, the motor can generate the required heat energy by increasing the direct-axis current, optimizing the bearing lubrication and reducing abnormal noise during cold-temperature startup, thereby improving vehicle comfort and reliability.

[0093] Step S23 , when the current motor temperature is greater than or equal to the target motor temperature, stop outputting the pulse width modulation signal.

[0094] It's understandable that when the onboard system detects through a temperature sensor that the current motor temperature has reached or exceeded the preset target motor temperature, the system automatically executes a pre-set control logic. This logic sends a stop signal to the motor control unit (MCU), instructing the MCU to immediately stop outputting the pulse-width modulation (PWM) signal to the motor's direct-axis winding. The PWM signal is a key signal used to control the current during the motor's stall heating process. By adjusting the pulse width, it can precisely control the current in the motor winding, and thus the heat generated by the motor. Stopping the PWM signal output interrupts the current supply, thus stopping the motor heating process. This prevents the motor from overheating, ensuring it operates within a safe temperature range and avoiding potential damage caused by overheating. It also improves energy efficiency, as once the desired temperature is reached, no additional energy is required to maintain heating. This step ensures the motor's reliability and lifespan under various environmental conditions.

[0095] This embodiment brakes the wheels when the current motor temperature is lower than the target motor temperature; while the wheels are braked, the current motor temperature is increased according to a preset direct-axis current value; and when the current motor temperature is greater than or equal to the target motor temperature, the pulse-width modulation signal output is stopped. When the vehicle system detects that the current motor temperature is lower than the target motor temperature, it first issues a command to brake the wheels, ensuring that the vehicle remains stationary during the subsequent motor heating process. This step not only ensures safety by preventing accidental vehicle movement during heating, but also provides the necessary conditions for motor stall heating. Next, the system generates a current control signal based on the preset direct-axis current value, converts it into a pulse-width modulation (PWM) signal, and feeds it into the motor's direct-axis winding. This precisely controls the motor's internal current, causing it to generate heat without rotating, thereby increasing the motor temperature. This control method allows the desired motor temperature to be reached quickly and efficiently, optimizes bearing lubrication, reduces abnormal noise during cold-start startup, and improves driving comfort. Finally, once the current motor temperature reaches or exceeds the target motor temperature, the system immediately stops outputting PWM signals. This measure effectively prevents motor overheating, ensures motor operation within a safe temperature range, avoids potential damage from overheating, improves energy efficiency, extends the life of the motor and its related components, and reduces maintenance costs, thereby enhancing vehicle performance and reliability and increasing customer satisfaction. The entire process not only improves the driving experience but also ensures vehicle stability and durability in various environmental conditions.

[0096] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the method for dealing with abnormal noise of vehicle powertrain bearings in the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0097] This application also provides a device for processing abnormal noise of vehicle powertrain bearings, please refer to Figure 4 The device for processing abnormal noise of a vehicle powertrain bearing comprises:

[0098] The temperature monitoring module 10 is used to monitor the current motor temperature when it detects that the main driving door is open;

[0099] The stall heating module 20 is used to brake the wheel when the current motor temperature is lower than the target motor temperature, and control the motor to perform stall heating according to the target stall heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature.

[0100] In one embodiment, the stall heating module 20 is further used to brake the wheel when the current motor temperature is lower than the target motor temperature; when the wheel is braked, increase the current motor temperature according to a preset direct-axis current value; and stop outputting the pulse width modulation signal when the current motor temperature is greater than or equal to the target motor temperature.

[0101] In one embodiment, the stalled-rotor heating module 20 is further used to generate a current control signal according to a preset direct-axis current value when the wheel is braked; generate a pulse width modulation signal according to the current control signal; and send the pulse width modulation signal to the direct-axis winding of the motor to increase the current motor temperature.

[0102] In one embodiment, the locked-rotor heating module 20 is further used to measure the in-vehicle noise through a microphone installed on a seat in the vehicle; measure the powertrain vibration amplitude through an acceleration sensor installed on an electric drive assembly or a hybrid powertrain; when the in-vehicle noise is less than a preset noise value and the powertrain vibration amplitude is less than a preset vibration amplitude, obtain the current motor temperature and use the current motor temperature as the target motor temperature.

[0103] In one embodiment, the temperature monitoring module 10 is further used to obtain in-vehicle noise data through the microphone; obtain powertrain vibration noise data through the acceleration sensor; perform order analysis on the powertrain vibration noise data to obtain abnormal noise order; when the powertrain vibration noise data corresponds to the in-vehicle noise data and the abnormal noise order is the powertrain bearing order, it is determined that the vehicle has abnormal powertrain bearing noise.

[0104] In one embodiment, the stall heating module 20 is also used to send a shift instruction to the transmission system to enable the vehicle to enter the parking gear; when the vehicle enters the parking gear, a motor power adjustment instruction is sent to the motor control unit to enable the motor control unit to increase the motor power; when the noise inside the vehicle is greater than or equal to the preset noise value, the current motor power is obtained, and the current motor power is used as the target stall heating power.

[0105] In one embodiment, the stall heating module 20 is further used to calculate the motor stall heating time according to the current motor temperature, the target motor temperature and the target stall heating power when the current motor temperature is lower than the target motor temperature; send the motor stall heating time to the instrument panel so that the instrument panel prompts according to the first preset prompt content and the motor stall heating time; and send a display update instruction to the instrument panel when the current motor temperature is greater than or equal to the target motor temperature so that the instrument panel prompts according to the second preset prompt content.

[0106] The device for treating abnormal noise from a vehicle powertrain bearing provided in this application, employing the method for treating abnormal noise from a vehicle powertrain bearing provided in the aforementioned embodiment, can address the technical problem of reducing abnormal noise from a vehicle powertrain bearing during low-temperature startup without increasing costs or changing the structural design. Compared to the prior art, the device for treating abnormal noise from a vehicle powertrain bearing provided in this application achieves the same beneficial effects as the method for treating abnormal noise from a vehicle powertrain bearing provided in the aforementioned embodiment. Other technical features of the device for treating abnormal noise from a vehicle powertrain bearing are the same as those disclosed in the aforementioned embodiment and are not further elaborated here.

[0107] The present application provides a device for processing abnormal noise from a vehicle powertrain bearing. The device for processing abnormal noise from a vehicle powertrain bearing 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 method for processing abnormal noise from a vehicle powertrain bearing in the above-mentioned embodiment one.

[0108] Reference below Figure 5, which shows a schematic structural diagram of a device suitable for implementing an embodiment of the present application to process abnormal noise from a vehicle powertrain bearing. The device for processing abnormal noise from a vehicle powertrain bearing 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), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 5 The device for processing abnormal noise of a vehicle powertrain bearing shown is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0109] like Figure 5 As shown, the vehicle powertrain bearing noise processing device may include a processing device 1001 (e.g., a central processing unit, graphics processing unit, etc.), which can perform various appropriate actions and processes based on programs stored in a read-only memory (ROM) 1002 or programs loaded from a storage device 1003 into a random access memory (RAM) 1004. RAM 1004 also stores various programs and data required for the operation of the vehicle powertrain bearing noise processing device. Processing device 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, a magnetic tape, hard disk, etc.; and communication devices 1009. Communication devices 1009 can allow the vehicle powertrain bearing noise processing device to communicate wirelessly or wired with other devices to exchange data. Although the figure shows a vehicle powertrain bearing noise processing device with various systems, it should be understood that not all of the illustrated systems are required to be implemented or present. More or fewer systems may be implemented or present instead.

[0110] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0111] The device for treating abnormal noise from vehicle powertrain bearings provided in this application, employing the method for treating abnormal noise from vehicle powertrain bearings described in the aforementioned embodiment, can address the technical problem of reducing abnormal noise from vehicle powertrain bearings during low-temperature startup without increasing costs or changing the structural design. Compared to the prior art, the device for treating abnormal noise from vehicle powertrain bearings provided in this application achieves the same beneficial effects as the method for treating abnormal noise from vehicle powertrain bearings described in the aforementioned embodiment. Other technical features of the device for treating abnormal noise from vehicle powertrain bearings are the same as those disclosed in the aforementioned embodiment and are not further elaborated here.

[0112] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0113] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0114] The present application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, and the computer-readable program instructions are used to execute the method for processing abnormal noise of a vehicle powertrain bearing in the above-mentioned embodiment.

[0115] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0116] The computer-readable storage medium may be included in the device for processing abnormal noise from a vehicle powertrain bearing; or it may exist independently without being assembled into the device for processing abnormal noise from a vehicle powertrain bearing.

[0117] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the processing device for abnormal noise of vehicle powertrain bearings, the processing device for abnormal noise of vehicle powertrain bearings: monitors the current motor temperature when it detects that the main driving door is open; brakes the wheel when the current motor temperature is lower than the target motor temperature, and controls the motor to perform locked-rotor heating according to the target locked-rotor heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature.

[0118] Computer program code for performing the operations of the present application may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0119] The flow charts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, program segment or a part of code, and the module, program segment or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented by a dedicated hardware-based system that performs the specified function or operation, or can be implemented by a combination of dedicated hardware and computer instructions.

[0120] The modules described in the embodiments of the present application may be implemented in software or hardware, wherein the name of a module does not necessarily limit the unit itself.

[0121] The computer-readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the aforementioned method for treating abnormal noise in vehicle powertrain bearings. This computer-readable storage medium addresses the technical problem of reducing abnormal noise in vehicle powertrain bearings during low-temperature startup without increasing costs or changing the structural design. Compared to the prior art, the beneficial effects of the computer-readable storage medium provided in this application are similar to those of the method for treating abnormal noise in vehicle powertrain bearings provided in the aforementioned embodiments, and are not further elaborated here.

[0122] The present application also provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the method for processing abnormal noise of a vehicle powertrain bearing as described above.

[0123] The computer program product provided in this application solves the technical problem of reducing abnormal noise from vehicle powertrain bearings during low-temperature startup without increasing costs or changing the structural design. Compared to the prior art, the beneficial effects of the computer program product provided in this application are similar to those of the method for addressing abnormal noise from vehicle powertrain bearings provided in the aforementioned embodiments, and are not further elaborated here.

[0124] The above description is only part of the embodiments of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for treating abnormal noise of a vehicle powertrain bearing, characterized in that: The method comprises: When the main car door is detected to be open, the current motor temperature is monitored; Sending a shift command to the transmission system to put the vehicle into park; When the vehicle enters a parking gear, sending a motor power adjustment instruction to a motor control unit so that the motor control unit increases the motor power; When the vehicle interior noise is greater than or equal to a preset noise value, obtaining the current motor power and using the current motor power as the target locked-rotor heating power; When the current motor temperature is lower than the target motor temperature, the wheel is braked, and the motor is controlled to perform locked-rotor heating according to the target locked-rotor heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature.

2. The method according to claim 1, wherein The step of braking the wheel when the current motor temperature is lower than the target motor temperature and controlling the motor to perform locked-rotor heating according to the target locked-rotor heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature comprises: braking the wheels when the current motor temperature is lower than the target motor temperature; When the wheel is braked, increasing the current motor temperature according to a preset direct-axis current value; When the current motor temperature is greater than or equal to the target motor temperature, outputting the pulse width modulation signal is stopped.

3. The method according to claim 2, wherein The step of increasing the current motor temperature according to a preset direct-axis current value when the wheel is braked comprises: When the wheel is braked, a current control signal is generated according to a preset direct-axis current value; generating a pulse width modulation signal according to the current control signal; The pulse width modulation signal is sent to the direct axis winding of the motor to increase the current motor temperature.

4. The method according to claim 1, wherein Before the step of braking the wheel when the current motor temperature is lower than the target motor temperature and controlling the motor to perform locked-rotor heating according to the target locked-rotor heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature, the method further includes: Measuring the noise inside the vehicle by means of a microphone, wherein the microphone is mounted on a seat inside the vehicle; Measuring the vibration amplitude of the powertrain by an acceleration sensor, wherein the acceleration sensor is installed on the electric drive assembly or the hybrid powertrain; When the in-vehicle noise is less than a preset noise value and the powertrain vibration amplitude is less than a preset vibration amplitude, the current motor temperature is acquired and used as the target motor temperature.

5. The method according to claim 4, wherein Before the step of monitoring the current motor temperature when detecting that the main vehicle door is opened, the method further includes: Acquiring in-vehicle noise data through the microphone; Acquiring powertrain vibration and noise data through the acceleration sensor; Performing order analysis on the powertrain vibration and noise data to obtain abnormal noise orders; When the powertrain vibration noise data corresponds to the in-vehicle noise data and the abnormal noise order is a powertrain bearing order, it is determined that the vehicle has abnormal powertrain bearing noise.

6. The method according to any one of claims 1 to 5, characterized in that Before the step of braking the wheel when the current motor temperature is lower than the target motor temperature and controlling the motor to perform locked-rotor heating according to the target locked-rotor heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature, the method further includes: When the current motor temperature is lower than the target motor temperature, the motor locked-rotor heating time is calculated according to the current motor temperature, the target motor temperature and the target locked-rotor heating power; Sending the motor stall heating time to an instrument panel, so that the instrument panel provides a prompt according to the first preset prompt content and the motor stall heating time; When the current motor temperature is greater than or equal to the target motor temperature, a display update instruction is sent to the instrument panel, so that the instrument panel prompts according to the second preset prompt content.

7. A device for processing abnormal noise of a vehicle powertrain bearing, characterized in that: The device comprises: The temperature monitoring module is used to monitor the current motor temperature when it detects that the main driving door is open; The locked-rotor heating module is configured to send a shift command to the transmission system to shift the vehicle into a parking gear; when the vehicle enters the parking gear, send a motor power adjustment command to the motor control unit to increase the motor power; and when the noise level inside the vehicle is greater than or equal to a preset noise value, obtain the current motor power and use the current motor power as the target locked-rotor heating power; The stall heating module is also used to brake the wheel when the current motor temperature is lower than the target motor temperature, and control the motor to perform stall heating according to the target stall heating power and the target motor temperature until the current motor temperature is greater than or equal to the target motor temperature.

8. A device for processing abnormal noise of vehicle powertrain bearings, characterized in that: The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the method for processing abnormal noise of a vehicle powertrain bearing according to any one of claims 1 to 6.

9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the method for processing abnormal noise of a vehicle powertrain bearing are implemented as described in any one of claims 1 to 6.

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