Vehicle low-speed vibration noise suppression method, device, vehicle and storage medium based on correlation factors

Abstract

The present application discloses a method, device, vehicle, and storage medium for suppressing low-speed vehicle vibration noise based on correlation factors, relating to the field of vehicle control technology, including: obtaining a noise signal and a vibration signal; obtaining vehicle low-speed vibration information by performing data processing on the noise signal and the vibration signal; determining the drive motor torque based on the vehicle low-speed vibration information according to vehicle parameter information; and adjusting the vehicle control strategy by adjusting the correlation factors if the drive motor torque is greater than a preset torque threshold. The cause and correlation factors of the vehicle low-speed vibration noise are determined by judging the magnitude of the drive motor torque, and a corresponding vehicle control strategy is formulated based on the correlation factors, thereby suppressing the vehicle low-speed vibration noise.

Description

Technical Field

[0001] The present application relates to the field of vehicle control technology, and in particular to a method, device, vehicle, and storage medium for suppressing low-speed vibration noise of a vehicle based on correlation factors. Background Art

[0002] When hybrid vehicles are in series power generation mode, the driving motor torque is large at low speeds with high throttle, the powertrain suspension enters the nonlinear region, and the suspension vibration isolation deteriorates, causing the engine vibration excitation to be transmitted to the entire vehicle, resulting in low-speed jitter and loud noise.

[0003] Currently, the low-speed jitter problem in pure electric operation is usually improved by controlling the torque of the drive motor, but no consideration has been given to how to solve the low-speed jitter problem caused by engine vibration in hybrid series power generation mode. Summary of the Invention

[0004] The main purpose of this application is to provide a method, device, vehicle and storage medium for suppressing vehicle low-speed vibration noise based on correlation factors, aiming to solve the technical problem that in the existing hybrid series power generation mode, the driving motor torque is large at high throttle and low speed, resulting in low-speed jitter and high noise.

[0005] To achieve the above objectives, the present application proposes a method for suppressing vehicle low-speed vibration and noise based on correlation factors, the method comprising:

[0006] Acquire noise signals and vibration signals;

[0007] Obtaining low-speed vehicle vibration information by performing data processing on the noise signal and the vibration signal;

[0008] Based on the low-speed vibration information of the vehicle, determining the drive motor torque according to the vehicle parameter information;

[0009] If the driving motor torque is greater than a preset torque threshold, the vehicle control strategy is adjusted by adjusting the associated factors.

[0010] In one embodiment, before the step of adjusting the vehicle control strategy by adjusting the associated factors if the drive motor torque is greater than the preset torque threshold, the method further includes:

[0011] Test the vibration acceleration under different drive motor torques;

[0012] If the vibration acceleration is equal to the preset acceleration threshold, the drive motor torque corresponding to the vibration acceleration is recorded as the maximum torque of the drive motor;

[0013] determining a vehicle speed upper limit based on the vehicle low-speed vibration information;

[0014] Determine the power balance point based on power balance and demand scenarios.

[0015] In one embodiment, the associated factors include at least: drive motor torque, vehicle speed, engine operating condition, and power;

[0016] The step of adjusting the vehicle control strategy by adjusting the associated factors includes:

[0017] When the actual vehicle speed is greater than the upper speed limit, the engine is used to supplement power according to the first required power, and the vehicle is controlled to maintain the series power generation mode unchanged;

[0018] When the actual vehicle speed is less than or equal to the upper speed limit, and the actual battery level is greater than or equal to the battery balance point, starting the engine is prohibited, and the vehicle is controlled to enter pure electric mode;

[0019] When the actual vehicle speed is less than or equal to the upper speed limit, and the actual power is less than the power balance point, the engine is used to supplement power according to the second required power, and outputs power according to the required torque of the drive motor and the maximum torque of the drive motor, and controls the vehicle to maintain the series power generation mode unchanged.

[0020] In one embodiment, the step of outputting according to the required torque of the driving motor and the maximum torque of the driving motor includes:

[0021] If the required torque of the drive motor is less than the maximum torque of the drive motor, controlling the vehicle to output at the required torque of the drive motor;

[0022] If the required torque of the driving motor is greater than or equal to the maximum torque of the driving motor, the vehicle is controlled to output at the maximum torque of the driving motor.

[0023] In one embodiment, the step of determining the drive motor torque according to vehicle parameter information based on the vehicle low-speed vibration information includes:

[0024] Collect vibration signals from the active and passive ends of the suspension;

[0025] Based on the low-speed vibration information of the vehicle and the vibration signals of the active and passive ends of the suspension, the second-order vibration frequencies of the active and passive ends of the suspension are obtained according to the vehicle parameter information;

[0026] Obtaining a suspension vibration isolation rate according to the second-order vibration frequencies of the active end and the passive end of the suspension;

[0027] The driving motor torque is determined according to the mount vibration isolation rate.

[0028] In one embodiment, the step of obtaining the vehicle low-speed jitter information by performing data processing on the noise signal and the vibration signal includes:

[0029] Preprocessing the noise signal and the vibration signal to obtain preprocessed data, wherein the preprocessing at least includes: filtering, noise reduction, and signal enhancement;

[0030] Based on the pre-processed data, identifying and extracting engine main-order noise and vibration data;

[0031] By analyzing the main-order noise and vibration data of the engine, the low-speed vibration information of the vehicle is obtained.

[0032] In one embodiment, the step of obtaining the noise signal and the vibration signal includes:

[0033] Acquire the noise signal at the right ear of the driver through the microphone;

[0034] The vibration signal of the vehicle's driver's seat is obtained through the sensor.

[0035] In addition, to achieve the above-mentioned purpose, the present application also proposes a vehicle low-speed vibration and noise suppression device based on correlation factors, the vehicle low-speed vibration and noise suppression device based on correlation factors comprising:

[0036] An acquisition module, used for acquiring noise signals and vibration signals;

[0037] an analysis module, configured to obtain low-speed vehicle vibration information by performing data processing on the noise signal and the vibration signal;

[0038] a determination module, configured to determine a drive motor torque based on the vehicle low-speed vibration information and vehicle parameter information;

[0039] The control module is configured to adjust the vehicle control strategy by adjusting associated factors if the drive motor torque is greater than a preset torque threshold.

[0040] In addition, to achieve the above-mentioned purpose, the present application also proposes a vehicle, which includes: a memory, a processor, and a computer program stored on the memory and runnable on the processor, wherein the computer program is configured to implement the steps of the vehicle low-speed vibration and noise suppression method based on correlation factors as described above.

[0041] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by the processor, the steps of the vehicle low-speed vibration noise suppression method based on correlation factors as described above are implemented.

[0042] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, it implements the steps of the vehicle low-speed vibration and noise suppression method based on correlation factors as described above.

[0043] One or more technical solutions proposed in this application obtain noise and vibration signals; process the noise and vibration signals to obtain low-speed vehicle vibration information; determine the drive motor torque based on the low-speed vehicle vibration information and vehicle parameter information; and adjust the vehicle control strategy by adjusting related factors if the drive motor torque exceeds a preset torque threshold. The cause and related factors of the vehicle's low-speed vibration noise are determined by determining the magnitude of the drive motor torque, and a corresponding vehicle control strategy is formulated based on the related factors to suppress the vehicle's low-speed vibration noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] 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.

[0045] 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.

[0046] Figure 1 A flow chart of a first embodiment of a method for suppressing low-speed vehicle vibration noise based on correlation factors of the present application is provided;

[0047] Figure 2 This is a brief schematic diagram of vehicle low-speed vibration information according to an embodiment of the vehicle low-speed vibration noise suppression method based on correlation factors of the present application;

[0048] Figure 3 This is a schematic diagram of low-speed vibration and noise operating conditions of an embodiment of a method for suppressing low-speed vehicle vibration and noise based on correlation factors of this application;

[0049] Figure 4 A flow chart of a second embodiment of the method for suppressing low-speed vibration noise of a vehicle based on correlation factors is provided in this application;

[0050] Figure 5 A schematic diagram of a simplified process of a vehicle low-speed vibration and noise suppression method based on correlation factors provided in this application;

[0051] Figure 6 This is a schematic diagram of the module structure of a vehicle low-speed vibration and noise suppression device based on correlation factors according to an embodiment of the present application;

[0052] Figure 7 Schematic diagram of the vehicle structure of the hardware operating environment involved in the method for suppressing vehicle low-speed vibration and noise based on correlation factors in an embodiment of the present application.

[0053] 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

[0054] 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.

[0055] 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.

[0056] The main solutions of the embodiments of this application are:

[0057] Because hybrid vehicles are in series power generation mode, the driving motor torque is large at low speeds with high throttle, the powertrain suspension enters the nonlinear region, and the suspension vibration isolation deteriorates, causing the engine vibration excitation to be transmitted to the entire vehicle, causing low-speed jitter and high noise problems.

[0058] The present application provides a solution to determine the causes and related factors of low-speed vibration noise of the vehicle by judging the magnitude of the driving motor torque, and formulating corresponding vehicle control strategies based on the related factors, thereby suppressing the low-speed vibration noise of the vehicle.

[0059] It should be noted that the execution subject of this embodiment can 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 vehicle capable of implementing the above functions. The following uses a vehicle as an example to illustrate this embodiment and the following embodiments.

[0060] Based on this, the embodiment of the present application provides a method for suppressing low-speed vibration noise of a vehicle based on correlation factors, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the vehicle low-speed vibration and noise suppression method based on correlation factors of the present application.

[0061] In this embodiment, the method for suppressing low-speed vehicle vibration noise based on correlation factors includes steps S10 to S40:

[0062] Step S10: Acquire noise signals and vibration signals.

[0063] It should be noted that noise signals generally refer to sound signals generated during vehicle operation. These signals may cause discomfort to drivers and passengers, affect ride comfort, and may even be harmful to human health.

[0064] Vibration signals generally refer to signals expressed by physical quantities that change periodically over time. They can be collected, analyzed, and applied through various sensors and measuring devices.

[0065] In a specific embodiment, a noise signal at the right ear of the vehicle driver can be obtained through a microphone; and a vibration signal at the vehicle driver's seat can be obtained through a sensor.

[0066] Specifically, a microphone is a device that converts sound waves into electrical signals or mechanical effects and is widely used in the transmission and detection of sound. Depending on the principle, microphones can be divided into magnetoelectric microphones, piezoelectric microphones, and electrodynamic microphones. Magnetoelectric microphones are based on the magnetoelectric effect and convert sound wave signals into electrical signals for output. Piezoelectric microphones use the piezoelectric effect to convert sound wave signals into electrical signals. Electrodynamic microphones include electrodynamic speakers and electronic microphones, which use motor designs to transmit or receive sound. The microphone types here are compatible with currently used magnetoelectric microphones, piezoelectric microphones, and electrodynamic microphones.

[0067] Among them, a sensor is usually a device that detects and responds to certain types of input from the external environment, and it converts the detected information into electrical signals or other required forms of output for subsequent data processing and analysis.

[0068] It is understandable that from an ergonomic perspective, the position of the driver's right ear is relatively fixed and has a specific spatial relationship with the noise sources inside and outside the vehicle, which facilitates unified standard noise collection under different vehicle models and driving conditions. The resulting data is comparable and of reference value.

[0069] The driver's right ear directly receives noise signals from both inside and outside the vehicle. Noise collected here accurately reflects the driver's actual noise exposure, including intensity and frequency characteristics. This allows for understanding the direct impact of noise on the driver's auditory system and assessing the potential risk of auditory fatigue and damage. The driver's perception of driving comfort is significantly influenced by noise, and the noise level at the driver's right ear directly reflects the driver's subjective experience. By collecting noise signals at this location, we can assess the impact of the vehicle's noise control level on driving comfort, providing a basis for improving vehicle design and enhancing ride comfort.

[0070] The relatively open area near the driver's right ear makes it easy to install a microphone without obstructing the driver's normal operation or vision. Furthermore, installing the microphone here ensures more stable noise signal acquisition, reducing data errors caused by equipment shaking or displacement.

[0071] In addition, the seat is one of the main parts of contact between the driver and the vehicle. The vibration of the driver's seat will be directly transmitted to the driver, affecting his driving comfort. By obtaining the vibration signal of the vehicle's driver's seat, the impact of this vibration on driving comfort can be quantitatively evaluated so that measures can be taken to improve it.

[0072] Step S20: obtaining vehicle low-speed vibration information by performing data processing on the noise signal and the vibration signal.

[0073] It should be noted that data processing of vibration signals and noise signals is to extract valuable information from the original signals, which can better understand and analyze the vehicle's operating conditions, driving comfort and other issues.

[0074] In addition, low-speed vehicle vibration typically refers to noticeable vibration in parts such as the vehicle body, steering wheel, or seat when the vehicle is traveling at low speeds (usually around 20-60 km / h). Low-speed vehicle vibration is often accompanied by noise issues, which may be related to factors such as the powertrain, tire cavity modal resonance, the dynamic characteristics of the electric drive system, and pressure pulsation in the brake system. Solving these problems requires comprehensive analysis and optimization of the vehicle's noise, vibration, and harshness (NVH) performance.

[0075] Therefore, after obtaining the vehicle low-speed jitter information, the causes and related factors of the vehicle low-speed vibration noise can be analyzed based on the vehicle low-speed jitter information.

[0076] In a specific embodiment, the noise signal and the vibration signal can be preprocessed to obtain preprocessed data, wherein the preprocessing includes at least: filtering, noise reduction and signal enhancement; based on the preprocessed data, the engine main-order noise and vibration data are identified and extracted; and the vehicle low-speed jitter information is obtained by performing data analysis on the engine main-order noise and vibration data.

[0077] Specifically, by designing various filters, such as low-pass filters, high-pass filters, band-pass filters, etc., unnecessary frequency components in the noise signal are filtered out and the frequency components of the useful signal are retained; various noise reduction algorithms are used to process the noisy signal, such as wavelet noise reduction, adaptive filtering, etc., and by decomposing and reconstructing the signal, the noise components are suppressed and the useful signal is enhanced; some signal enhancement technologies, such as signal averaging and correlation detection, are used to increase the strength of the useful signal relative to the noise signal and improve the signal quality; the extracted engine main-order noise and vibration data are analyzed, especially focusing on the data performance when the vehicle is running at low speed, and the low-speed jitter information is determined based on the analysis results, including but not limited to jitter intensity, frequency distribution and its change pattern over time.

[0078] For easier understanding, please refer to Figure 2 , Figure 2 This is a brief schematic diagram of the low-speed vibration information of the vehicle in this embodiment, and according to Figure 2 The information obtained from the rectangular box marked with black lines in the lower left corner is that the second-order vibration frequency of the engine is more prominent in the low vehicle speed range (about 0-60 km / h).

[0079] Step S30: Based on the low-speed vibration information of the vehicle, the driving motor torque is determined according to the vehicle parameter information.

[0080] It should be noted that the vehicle parameter information includes at least data such as mass, stiffness, engine speed and torque, drive motor speed, power and vehicle speed.

[0081] In a specific implementation, the vibration signals of the active and passive ends of the suspension can be collected; based on the low-speed vibration information of the vehicle and the vibration signals of the active and passive ends of the suspension, the second-order vibration frequencies of the active and passive ends of the suspension are obtained according to the vehicle parameter information; the suspension vibration isolation rate is obtained according to the second-order vibration frequencies of the active and passive ends of the suspension; and the driving motor torque is determined according to the suspension vibration isolation rate.

[0082] Specifically, vibration sensors are arranged at the active end (usually the end connected to the engine or power source) and the passive end (the end connected to the frame or body) of the suspension. The sensor should be installed in a position where the vibration can be accurately measured. Generally, a rigid part near the suspension connection point is selected. According to the frequency range and amplitude of the vibration, a suitable acceleration sensor or displacement sensor is selected. When the vehicle is in a specific working condition (such as idling, constant speed driving, acceleration, etc.), a data acquisition system is used to synchronously collect the vibration signals of the active and passive end sensors. According to the collected vibration signals of the active and passive end sensors and combined with the vehicle parameter information, the second-order vibration frequency of the active and passive ends of the suspension can be obtained; and the suspension vibration isolation rate can be obtained through the second-order vibration frequency of the active and passive ends of the suspension. The range of smaller suspension vibration isolation rate also corresponds to the range of larger drive motor torque, so the drive motor torque can also be determined.

[0083] For easier understanding, please refer to Figure 3 , Figure 3 This is a schematic diagram of low-speed vibration and noise working conditions. Figure 3 is based on Figure 2 The low-speed vibration information of the vehicle is combined with the vehicle parameter information to obtain a schematic diagram, where: Figure 3 The red curve in the figure can represent the change law of the driving motor torque, the green curve can represent the change law of the engine torque, and the blue curve can represent the change law of the engine speed. The horizontal axis of the coordinate system represents the vehicle speed, the vertical axis on the left represents the torque size, and the vertical axis on the right represents the speed size.

[0084] Step S40: If the driving motor torque is greater than the preset torque threshold, the vehicle control strategy is adjusted by adjusting the associated factors.

[0085] It should be noted that the preset torque threshold is a manually set value. When the driving motor torque is greater than the preset torque threshold, it can be considered that the driving motor torque is too large. For example, according to Figure 3 Based on this information, we can determine that the NVH issue is caused by excessive drive motor torque at low speeds, which causes the powertrain mount to operate in the nonlinear stiffness region, resulting in poor mount vibration isolation. This causes engine vibration excitation to be transmitted to the entire vehicle, causing low-speed jitter and high noise. The relevant factors can be determined to be drive motor torque, vehicle speed, engine operating condition, and battery charge.

[0086] In addition, the vehicle control strategy may be a control strategy that suppresses low-speed vibration and noise of the vehicle by adjusting related factors.

[0087] This embodiment provides a method for suppressing low-speed vehicle vibration noise based on correlation factors. The method comprises obtaining a noise signal and a vibration signal; processing the noise and vibration signals to obtain low-speed vehicle vibration information; determining the drive motor torque based on vehicle parameter information based on the low-speed vehicle vibration information; and adjusting the vehicle control strategy by adjusting the correlation factors if the drive motor torque exceeds a preset torque threshold. The cause and correlation factors of the low-speed vehicle vibration noise are determined by determining the magnitude of the drive motor torque, and a corresponding vehicle control strategy is formulated based on the correlation factors to suppress the low-speed vehicle vibration noise.

[0088] 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 4 , step S40 includes steps S401 to S403:

[0089] Step S401: When the actual vehicle speed is greater than the upper speed limit, the engine is used to supplement power according to the first required power, and the vehicle is controlled to maintain the series power generation mode unchanged.

[0090] It should be noted that before step S40, it is necessary to test the vibration acceleration under different drive motor torques; if the vibration acceleration is equal to the preset acceleration threshold, the drive motor torque corresponding to the vibration acceleration is recorded as the maximum torque of the drive motor; the vehicle speed upper limit is determined based on the vehicle low-speed vibration information; and the power balance point is determined based on the power balance and demand scenario.

[0091] In a specific embodiment, the vibration acceleration under different drive motor torques is tested, and the vibration acceleration of the vehicle in a non-shaking state, which is subjectively evaluated, is used as a preset acceleration threshold. If the vibration acceleration is equal to the preset acceleration threshold, the drive motor torque corresponding to the preset acceleration is recorded as the maximum torque (T1) of the drive motor. The upper speed limit of the vehicle vibration can be determined from the low-speed vehicle vibration information above, which is recorded as H1. For example, according to Figure 2 or Figure 3 It can be determined that the upper limit of the vehicle vibration speed is 60 km / h; according to the electric balance and user demand scenarios, the electric balance point under different driving modes can be determined, recorded as soc1, and this electric balance point can be used to start the engine.

[0092] Specifically, when the actual vehicle speed is greater than H1, the engine is used to supplement power according to the first required power, and the vehicle is controlled to maintain the series power generation mode unchanged.

[0093] It should be understood that the hybrid vehicle of this embodiment is initially in series power generation mode. In this mode, the engine does not directly drive the vehicle, but instead drives the generator. Part of the electricity generated by the generator is used to directly drive the motor to propel the vehicle, while the remaining portion is used to charge the battery pack. In this mode, the vehicle is driven entirely by the drive motor, with the engine serving only as a generator, much like a mobile power station.

[0094] In addition, demand power usually refers to the electric power required by the vehicle under various driving conditions to meet various needs such as power output, maintaining normal vehicle operation, and powering on-board equipment.

[0095] Step S402: When the actual vehicle speed is less than or equal to the upper speed limit, and the actual battery level is greater than or equal to the battery balance point, starting the engine is prohibited, and the vehicle is controlled to enter the pure electric mode.

[0096] It's important to note that in pure electric mode, hybrid vehicles rely entirely on the energy stored in the battery pack to propel the vehicle. The vehicle's powertrain disconnects the engine's power output, and the drive motor directly drives the wheels. The drive motor draws electrical energy from the battery, converting it into mechanical energy to propel the vehicle. Furthermore, the drive motor operates with less noise, creating a quieter and more comfortable driving environment than an engine.

[0097] In a specific implementation, when the actual vehicle speed is ≤H1 and the actual power is ≥soc1, in order to avoid jitter and noise problems, starting the engine is prohibited and the vehicle is controlled to enter pure electric mode.

[0098] Step S403: When the actual vehicle speed is less than or equal to the upper speed limit, and the actual power is less than the power balance point, the engine is used to supplement power according to the second required power, and outputs power according to the required torque of the drive motor and the maximum torque of the drive motor, and controls the vehicle to maintain the series power generation mode unchanged.

[0099] In practice, when the actual vehicle speed is ≤ H1 and the actual battery charge is less than soc1, the engine must be used to replenish the battery to avoid vehicle power outages. This is done by using the engine to replenish power at the second required power. Furthermore, to avoid vibration, noise, and battery drain, the maximum torque of the drive motor must be limited. The first and second required power levels are typically different.

[0100] Therefore, if the required torque of the drive motor is less than the maximum torque (T1) of the drive motor, the vehicle is controlled to output with the required torque of the drive motor; if the required torque of the drive motor is greater than or equal to the maximum torque (T1) of the drive motor, the vehicle is controlled to output with the maximum torque (T1) of the drive motor.

[0101] It should be noted that recharging generally refers to the phenomenon in which the battery is unable to receive normal charging due to a charging system failure or other reasons while the vehicle is in motion, causing the battery power to gradually decrease. For example, a generator failure or a charging line disconnection can prevent the battery from receiving timely power replenishment while the vehicle is running, resulting in a recharging state.

[0102] Low battery generally refers to a condition where the battery charge is excessively depleted, falling below normal usage levels, either while the vehicle is idle or in use. This can occur due to various reasons, such as the vehicle being unused for an extended period while some devices are still drawing power, or the vehicle being used with high-power electrical equipment that exceeds the battery's capacity and the charging system's ability to replenish it.

[0103] In this embodiment, when the actual vehicle speed is greater than the upper speed limit, the engine is used to supplement power according to the first required power, and the vehicle is controlled to remain in series power generation mode. When the actual vehicle speed is less than or equal to the upper speed limit, and the actual battery charge is greater than or equal to the battery balance point, the engine is prohibited from starting, and the vehicle is controlled to enter pure electric mode. When the actual vehicle speed is less than or equal to the upper speed limit, and the actual battery charge is less than the battery balance point, the engine is used to supplement power according to the second required power, and output is based on the required torque of the drive motor and the maximum torque of the drive motor, and the vehicle is controlled to remain in series power generation mode. Based on different vehicle states, different vehicle control strategies are adjusted by adjusting related factors. Without changing the hardware or affecting other performance, the low-speed jitter and noise problems are solved with the most economical strategy, providing users with a quiet riding environment.

[0104] For example, in order to help understand the implementation process of the vehicle low-speed vibration noise suppression method based on correlation factors obtained by combining this embodiment with the above embodiment 1, please refer to Figure 5 , Figure 5A simplified flow chart of a method for suppressing low-speed vibration and noise of a vehicle based on correlation factors is provided, specifically: obtaining a noise signal and a vibration signal; performing data processing on the noise signal and the vibration signal to obtain low-speed vibration information of the vehicle; determining the drive motor torque based on the low-speed vibration information of the vehicle according to vehicle parameter information; if the drive motor torque is greater than a preset torque threshold, determining that the cause of the whole vehicle vibration and noise is that the drive motor is too large, causing the powertrain to be suspended in a nonlinear region, resulting in poor suspension vibration isolation; judging the actual vehicle speed, and if the actual vehicle speed is greater than the upper speed limit (H1), supplementing the power through the engine according to the first required power, and controlling the vehicle to maintain the series power generation mode unchanged; if the actual vehicle speed is less than or equal to the upper speed limit (H1), and ... If the actual battery charge is greater than or equal to the battery balance point (soc1), the engine is prohibited from starting and the vehicle is controlled to enter the pure electric mode; if the actual vehicle speed is less than or equal to the vehicle speed upper limit (H1), and the actual battery charge is less than the battery balance point (soc1), the engine is used to supplement the power according to the second required power, and output is performed according to the required torque of the drive motor and the maximum torque of the drive motor; if the required torque of the drive motor is less than the maximum torque of the drive motor (T1), the vehicle is controlled to output at the required torque of the drive motor; if the required torque of the drive motor is greater than or equal to the maximum torque of the drive motor (T1), the vehicle is controlled to output at the maximum torque of the drive motor (T1); and the vehicle is controlled to maintain the series power generation mode unchanged. By judging the size of the drive motor torque, the cause and related factors of the vehicle's low-speed vibration noise are determined, and the corresponding vehicle control strategy is formulated based on the related factors, thereby suppressing the vehicle's low-speed vibration noise.

[0105] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the vehicle low-speed vibration and noise suppression method based on correlation factors of the present application. More forms of simple transformations based on this technical concept are all within the scope of protection of the present application.

[0106] This application also provides a vehicle low-speed vibration noise suppression device based on correlation factors, please refer to Figure 6 The vehicle low-speed vibration noise suppression device based on correlation factors includes:

[0107] The acquisition module 10 is used to acquire noise signals and vibration signals.

[0108] The analysis module 20 is configured to obtain low-speed vehicle vibration information by performing data processing on the noise signal and the vibration signal.

[0109] The determination module 30 is configured to determine the drive motor torque based on the low-speed vibration information of the vehicle and according to vehicle parameter information.

[0110] The control module 40 is configured to adjust the vehicle control strategy by adjusting associated factors if the driving motor torque is greater than a preset torque threshold.

[0111] The low-speed vehicle vibration and noise suppression device based on correlation factors provided in this application utilizes the low-speed vehicle vibration and noise suppression method based on correlation factors described in the above-mentioned embodiment, and can resolve the technical problem of large low-speed jitter and noise caused by high drive motor torque at low speeds with high throttle in the existing hybrid series power generation mode. Compared with the prior art, the beneficial effects of the low-speed vehicle vibration and noise suppression device based on correlation factors provided in this application are the same as the beneficial effects of the low-speed vehicle vibration and noise suppression method based on correlation factors provided in the above-mentioned embodiment, and the other technical features of the low-speed vehicle vibration and noise suppression device based on correlation factors are the same as those disclosed in the above-mentioned embodiment method, and are not further described here.

[0112] In one embodiment, the control module 40 is also used to test the vibration acceleration under different drive motor torques; if the vibration acceleration is equal to a preset acceleration threshold, the drive motor torque corresponding to the vibration acceleration is recorded as the maximum torque of the drive motor; the vehicle speed upper limit is determined based on the low-speed jitter information of the vehicle; and the power balance point is determined based on the power balance and demand scenario.

[0113] In one embodiment, the control module 40 is further configured to, when the actual vehicle speed is greater than the vehicle speed upper limit, supplement power through the engine according to the first required power, and control the vehicle to maintain the series power generation mode unchanged; when the actual vehicle speed is less than or equal to the vehicle speed upper limit, and the actual power is greater than or equal to the power balance point, prohibit starting the engine, and control the vehicle to enter the pure electric mode; when the actual vehicle speed is less than or equal to the vehicle speed upper limit, and the actual power is less than the power balance point, supplement power through the engine according to the second required power, and output according to the drive motor required torque and the maximum torque of the drive motor, and control the vehicle to maintain the series power generation mode unchanged.

[0114] In one embodiment, the control module 40 is further used to control the vehicle to output at the required torque of the drive motor if the required torque of the drive motor is less than the maximum torque of the drive motor; and to control the vehicle to output at the maximum torque of the drive motor if the required torque of the drive motor is greater than or equal to the maximum torque of the drive motor.

[0115] In one embodiment, the determination module 30 is further used to collect vibration signals from the active and passive ends of the suspension; based on the low-speed vibration information of the vehicle and the vibration signals from the active and passive ends of the suspension, the second-order vibration frequencies of the active and passive ends of the suspension are obtained according to the vehicle parameter information; the suspension vibration isolation rate is obtained according to the second-order vibration frequencies of the active and passive ends of the suspension; and the drive motor torque is determined according to the suspension vibration isolation rate.

[0116] In one embodiment, the analysis module 20 is further used to preprocess the noise signal and the vibration signal to obtain preprocessed data, wherein the preprocessing includes at least: filtering, noise reduction and signal enhancement; based on the preprocessed data, identifying and extracting the engine main-order noise and vibration data; and obtaining vehicle low-speed jitter information by performing data analysis on the engine main-order noise and vibration data.

[0117] In one embodiment, the acquisition module 10 is further configured to acquire a noise signal at the right ear of the driver of the vehicle through a microphone; and acquire a vibration signal at the driver's seat of the vehicle through a sensor.

[0118] The present application provides a vehicle, comprising: 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 as to enable the at least one processor to execute the vehicle low-speed vibration and noise suppression method based on correlation factors in the above-mentioned embodiment one.

[0119] Reference below Figure 7 , which shows a schematic structural diagram of a vehicle suitable for implementing the embodiments of the present application. The vehicle in the embodiments 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 7 The vehicle shown is merely an example and should not limit the functionality and scope of use of the embodiments of the present application.

[0120] like Figure 7As shown, the vehicle may include a processing device 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes based on programs stored in a read-only memory (ROM) 1002 or programs loaded from a storage device 1003 into a random access memory (RAM) 1004. RAM 1004 also stores various programs and data required for vehicle operation. Processing device 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems may be connected to I / O interface 1006: input 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), speakers, and vibrator; storage device 1003 including, for example, a magnetic tape or hard disk; and communication device 1009. The communication device 1009 can allow the vehicle to communicate with other devices wirelessly or by wire to exchange data. Although the figure shows a vehicle with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have instead.

[0121] 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.

[0122] The vehicle provided in this application utilizes the low-speed vibration and noise suppression method based on correlation factors described in the aforementioned embodiment, resolving the technical issue of high low-speed jitter and noise caused by high drive motor torque at low speeds with high throttle in existing hybrid series power generation modes. Compared to the prior art, the beneficial effects of the vehicle provided in this application are the same as those of the low-speed vibration and noise suppression method based on correlation factors described in the aforementioned embodiment. The other technical features of this vehicle are the same as those disclosed in the aforementioned embodiment and are not further elaborated upon here.

[0123] 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.

[0124] 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.

[0125] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, a computer program) stored thereon, and the computer-readable program instructions are used to execute the method for suppressing low-speed vehicle vibration noise based on correlation factors in the above-mentioned embodiment.

[0126] 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.

[0127] The computer-readable storage medium may be included in the vehicle, or may exist independently without being installed in the vehicle.

[0128] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the vehicle, the vehicle: obtains noise signals and vibration signals; obtains vehicle low-speed jitter information by performing data processing on the noise signals and the vibration signals; determines the drive motor torque based on the vehicle low-speed jitter information according to vehicle parameter information; if the drive motor torque is greater than a preset torque threshold, adjusts the vehicle control strategy by adjusting related factors.

[0129] 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).

[0130] 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.

[0131] 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.

[0132] 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 above-described method for suppressing low-speed vehicle vibration and noise based on correlation factors. This computer-readable storage medium can address the technical issue of high low-speed jitter and noise caused by high drive motor torque at low speeds with high throttle in existing hybrid series power generation modes. Compared to the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the method for suppressing low-speed vehicle vibration and noise based on correlation factors provided in the above-described embodiments, and are not further elaborated here.

[0133] 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 suppressing low-speed vehicle vibration and noise based on correlation factors as described above.

[0134] The computer program product provided in this application can address the technical issue of high low-speed vibration and noise caused by high drive motor torque at low speeds with high throttle in existing hybrid series power generation modes. Compared to existing technologies, the beneficial effects of the computer program product provided in this application are similar to those of the correlation-based low-speed vehicle vibration and noise suppression method provided in the aforementioned embodiment, and are not further elaborated here.

[0135] The above description is only part of the embodiments of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for suppressing low-speed vehicle vibration noise based on correlation factors, characterized in that: The method comprises: Acquire noise signals and vibration signals; Obtaining low-speed vehicle vibration information by performing data processing on the noise signal and the vibration signal; Based on the low-speed vibration information of the vehicle, determining the drive motor torque according to the vehicle parameter information; If the drive motor torque is greater than a preset torque threshold, adjusting the vehicle control strategy by adjusting associated factors, wherein the associated factors include at least: drive motor torque, vehicle speed, engine operating condition, and power; The step of adjusting the vehicle control strategy by adjusting the associated factors includes: When the actual vehicle speed is greater than the upper speed limit, the engine is used to supplement power according to the first required power, and the vehicle is controlled to maintain the series power generation mode unchanged; When the actual vehicle speed is less than or equal to the upper speed limit, and the actual battery level is greater than or equal to the battery balance point, starting the engine is prohibited, and the vehicle is controlled to enter pure electric mode; When the actual vehicle speed is less than or equal to the upper speed limit, and the actual power is less than the power balance point, the engine is used to supplement power according to the second required power, and outputs power according to the required torque of the drive motor and the maximum torque of the drive motor, and controls the vehicle to maintain the series power generation mode unchanged.

2. The method according to claim 1, wherein Before the step of adjusting the vehicle control strategy by adjusting the associated factors if the drive motor torque is greater than the preset torque threshold, the method further includes: Test the vibration acceleration under different drive motor torques; If the vibration acceleration is equal to the preset acceleration threshold, the drive motor torque corresponding to the vibration acceleration is recorded as the maximum torque of the drive motor; determining a vehicle speed upper limit based on the vehicle low-speed vibration information; Determine the power balance point based on power balance and demand scenarios.

3. The method according to claim 1, wherein The step of outputting according to the required torque of the driving motor and the maximum torque of the driving motor comprises: If the required torque of the drive motor is less than the maximum torque of the drive motor, controlling the vehicle to output at the required torque of the drive motor; If the required torque of the driving motor is greater than or equal to the maximum torque of the driving motor, the vehicle is controlled to output at the maximum torque of the driving motor.

4. The method according to claim 1, wherein The step of determining the driving motor torque according to vehicle parameter information based on the vehicle low-speed vibration information includes: Collect vibration signals from the active and passive ends of the suspension; Based on the low-speed vibration information of the vehicle and the vibration signals of the active and passive ends of the suspension, the second-order vibration frequencies of the active and passive ends of the suspension are obtained according to the vehicle parameter information; Obtaining a suspension vibration isolation rate according to the second-order vibration frequencies of the active end and the passive end of the suspension; The driving motor torque is determined according to the mount vibration isolation rate.

5. The method according to claim 1, wherein The step of obtaining the vehicle low-speed vibration information by performing data processing on the noise signal and the vibration signal includes: Preprocessing the noise signal and the vibration signal to obtain preprocessed data, wherein the preprocessing at least includes: filtering, noise reduction, and signal enhancement; Based on the pre-processed data, identifying and extracting engine main-order noise and vibration data; By analyzing the main-order noise and vibration data of the engine, the low-speed vibration information of the vehicle is obtained.

6. The method according to claim 1, wherein The step of obtaining the noise signal and the vibration signal comprises: Acquire the noise signal at the right ear of the driver through the microphone; The vibration signal of the vehicle's driver's seat is obtained through the sensor.

7. A vehicle low-speed vibration noise suppression device based on correlation factors, characterized in that: The vehicle low-speed vibration noise suppression device based on correlation factors includes: An acquisition module, used for acquiring noise signals and vibration signals; an analysis module, configured to obtain low-speed vehicle vibration information by performing data processing on the noise signal and the vibration signal; a determination module, configured to determine a drive motor torque based on the vehicle low-speed vibration information and vehicle parameter information; a control module, configured to adjust a vehicle control strategy by adjusting associated factors if the drive motor torque is greater than a preset torque threshold; The control module is also used to, when the actual vehicle speed is greater than the vehicle speed upper limit, supplement power through the engine according to the first required power, and control the vehicle to maintain the series power generation mode unchanged; when the actual vehicle speed is less than or equal to the vehicle speed upper limit, and the actual power is greater than or equal to the power balance point, prohibit starting the engine, and control the vehicle to enter the pure electric mode; when the actual vehicle speed is less than or equal to the vehicle speed upper limit, and the actual power is less than the power balance point, supplement power through the engine according to the second required power, and output according to the drive motor required torque and the maximum torque of the drive motor, and control the vehicle to maintain the series power generation mode unchanged.

8. A vehicle, characterized in that: The vehicle 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 suppressing low-speed vibration and noise of a vehicle based on correlation factors 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 having a computer program stored thereon. When the computer program is executed by a processor, the steps of the method for suppressing low-speed vehicle vibration and noise based on correlation factors as described in any one of claims 1 to 6 are implemented.

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