Vehicle active noise reduction method, device and storage medium

Abstract

The present invention discloses a vehicle active noise reduction method, device and storage medium. The method part comprises: obtaining noise source signals at multiple different positions obtained by performing an actual vehicle test on a vehicle; dividing the multiple noise source signals into multiple reference signals, and performing in-vehicle noise reduction simulation on the vehicle according to the multiple reference signals to obtain a simulated noise reduction effect corresponding to each reference signal; determining a target reference signal from the multiple reference signals according to the corresponding simulated noise reduction effect, and setting the collection position of the target reference signal as the noise source reference signal collection position of an active noise reduction control system in the vehicle; in the present invention, by obtaining the actual vehicle noise source signal as a simulation variable, the optimal target reference signal collection position is directly determined according to the noise reduction effect obtained by the simulation, so that an accurate noise source reference signal can be collected as an input of the vehicle active noise reduction control system, thereby improving the noise reduction effect of the vehicle active noise reduction control system.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle active noise reduction, and in particular to a vehicle active noise reduction method, device and storage medium. Background Art

[0002] The sound insulation effect of vehicles is generally poor, which results in many different noises during the driving process, such as tire noise, road noise, and engine noise, which makes the user experience of the occupants poor. For this reason, active noise reduction control technology is proposed to reduce the impact of noise. The noise reduction principle of vehicle active noise reduction control technology is: collect the reference signal of the noise source, and then calculate the correction signal with the same frequency, equal amplitude and opposite phase as the noise signal in the car based on the reference signal, and control the audio player to send out the correction signal, so as to use the principle of sound wave interference to achieve the purpose of noise reduction. Since the acquisition of the correction signal depends on the reference signal of the noise source, the selection of the reference signal plays a vital role in the noise reduction effect of the vehicle active noise reduction control system.

[0003] The current method for selecting reference signals in active noise control technology is to obtain noise source signals at different locations through sensors, then use the principle of multiple coherence to calculate the coherence coefficient between the noise source signal and the in-vehicle noise signal, and select the noise source signal with a high coherence coefficient with the in-vehicle noise signal as the reference signal. However, the reference signal indirectly obtained based on the coherence principle is not accurate enough, resulting in poor noise reduction effect of the vehicle active noise control system using the reference signal as input. Summary of the invention

[0004] The present invention provides a vehicle active noise reduction method, device and storage medium to solve the problem that it is difficult to select an accurate reference signal in the existing active noise control technology, resulting in poor noise reduction effect of the existing vehicle active noise control system.

[0005] A vehicle active noise reduction method is provided, comprising:

[0006] Acquire noise source signals at multiple different positions obtained by performing a real vehicle test on the vehicle;

[0007] Dividing the multiple noise source signals into multiple reference signals, and performing in-vehicle noise reduction simulation on the vehicle according to the multiple reference signals to obtain a simulated noise reduction effect corresponding to each reference signal, wherein each reference signal includes at least one noise source signal, and each reference signal includes a different noise source signal;

[0008] According to the simulated noise reduction effects corresponding to the reference signals, a target reference signal is determined from the multiple reference signals, and a collection position of the target reference signal is set as a noise source reference signal collection position of an active noise reduction control system in the vehicle.

[0009] Furthermore, a vehicle interior noise reduction simulation is performed on the vehicle according to the multiple reference signals to obtain a simulated noise reduction effect corresponding to each reference signal, including:

[0010] Determining multiple groups of simulation input parameters according to an active noise reduction algorithm of the active noise reduction control system, the simulation input parameters at least including an in-vehicle noise signal and a reference signal, and the reference signal of each group of simulation input parameters is different;

[0011] Inputting the simulation input parameters into the active noise reduction control system to perform in-vehicle noise reduction simulation to obtain a total noise reduction amount, and determining a simulation noise reduction effect corresponding to a reference signal in the simulation input parameters according to the total noise reduction amount;

[0012] All simulation input parameters are traversed until the simulation noise reduction effect corresponding to each reference signal is obtained.

[0013] Furthermore, the simulation input parameters are input into the active noise reduction control system to perform in-vehicle noise reduction simulation to obtain a total noise reduction amount, and a simulation noise reduction effect corresponding to a reference signal in the simulation input parameters is determined according to the total noise reduction amount, including:

[0014] Inputting the simulation input parameters into the active noise reduction control system to perform in-vehicle noise reduction simulation to determine the total noise reduction amount of the active noise reduction control system within a preset frequency band, and to determine the noise reduction amount of the active noise reduction control system at each major frequency point;

[0015] The sum of the noise reduction amounts of the active noise reduction control system at each main frequency point is recorded as the total noise reduction amount at the main frequency point, where the main frequency point is the frequency point corresponding to the peak value in the preset frequency range determined after spectrum analysis of the vehicle interior noise signal;

[0016] The total noise reduction amount and the total noise reduction amount of the main frequency point are used as the simulated noise reduction effect corresponding to the reference signal in the input parameters.

[0017] Furthermore, multiple groups of simulation input parameters are determined according to the active noise reduction algorithm of the active noise reduction control system, including:

[0018] When the active noise reduction algorithm is a minimum mean square algorithm based on X-filtering, an estimated value of the secondary path impulse response function of the actual vehicle is obtained;

[0019] The vehicle interior noise signal, the estimated value of the secondary path impulse response function, and any reference signal are combined into a set of simulation input parameters to obtain multiple sets of simulation input parameters.

[0020] Furthermore, the multiple noise source signals are divided into multiple reference signals, including:

[0021] Subdivide the position corresponding to the noise source into multiple collection areas;

[0022] According to the collection position of each noise source signal, the multiple noise source signals are divided into multiple signal groups, each signal group corresponds to a collection area;

[0023] Any noise source signal is selected in each signal group and randomly combined to obtain multiple reference signals.

[0024] Further, the simulated noise reduction effect is represented by a total noise reduction amount in a preset frequency band, and a target reference signal is determined from a plurality of reference signals according to the simulated noise reduction effect corresponding to each reference signal, including:

[0025] Compare the total noise reduction amounts corresponding to the reference signals to determine the total noise reduction amount with the largest value;

[0026] The reference signal corresponding to the total noise reduction amount with the largest value is used as the target reference signal.

[0027] Furthermore, the simulated noise reduction effect is represented by the total noise reduction amount and the total noise reduction amount of the main frequency points. According to the simulated noise reduction effect corresponding to each reference signal, a target reference signal is determined from multiple reference signals, including:

[0028] Comparing the total noise reduction amounts corresponding to the reference signals, determining the total noise reduction amount with the largest value, and determining whether the total noise reduction amount with the largest value corresponds to multiple reference signals;

[0029] If the total noise reduction amount with the largest value corresponds to a reference signal, the reference signal corresponding to the total noise reduction amount with the largest value is used as the target reference signal;

[0030] If the total noise reduction amount with the largest value corresponds to multiple reference signals, the multiple reference signals corresponding to the total noise reduction amount with the largest value are recorded as pending reference signals, and the pending reference signal corresponding to the total noise reduction amount of the largest main frequency point is used as the target reference signal.

[0031] A vehicle active noise reduction device is provided, comprising:

[0032] An acquisition module is used to acquire noise source signals at multiple different positions obtained by performing a real vehicle test on the vehicle;

[0033] A simulation module, used to divide the multiple noise source signals into multiple reference signals, and perform in-vehicle noise reduction simulation on the vehicle according to the multiple reference signals to obtain a simulated noise reduction effect corresponding to each reference signal, each reference signal includes at least one noise source signal, and each reference signal includes a different noise source signal;

[0034] The determination module is used to determine a target reference signal from multiple reference signals according to the simulated noise reduction effects corresponding to each reference signal, and set the collection position of the target reference signal as the noise source reference signal collection position of the active noise reduction control system in the vehicle.

[0035] A vehicle active noise reduction device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the vehicle active noise reduction method when executing the computer program.

[0036] A readable storage medium is provided, wherein the readable storage medium stores a computer program, and wherein the computer program implements the steps of the above-mentioned vehicle active noise reduction method when executed by a processor.

[0037] In one solution provided by the above-mentioned vehicle active noise reduction method, device and storage medium, by obtaining noise source signals at multiple different positions obtained by performing an actual vehicle test on the vehicle, the multiple noise source signals are then divided into multiple reference signals, and the vehicle is simulated for in-vehicle noise reduction according to the multiple reference signals to obtain a simulated noise reduction effect corresponding to each reference signal, each reference signal includes at least one noise source signal, and each reference signal includes different noise source signals, and then according to the simulated noise reduction effect corresponding to each reference signal, a target reference signal is determined from the multiple reference signals, and the collection position of the target reference signal is set as the noise source reference signal collection position of the active noise reduction control system in the vehicle; in the present invention, by obtaining the actual vehicle noise source signal as a simulation variable, the noise reduction effect of the noise source reference signal at different positions is verified in the form of simulation, and the optimal target reference signal collection position is directly determined based on the noise reduction effect obtained by simulation, so that accurate noise source reference signals can be collected during driving as input of the vehicle active noise reduction control system, thereby improving the noise reduction effect of the vehicle active noise reduction control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0039] Figure 1 is a structural schematic diagram of a vehicle active noise reduction system in one embodiment of the present invention;

[0040] Figure 2 is a schematic diagram of a process of a vehicle active noise reduction method in one embodiment of the present invention;

[0041] Figure 3 is a schematic diagram of dividing a reference signal in one embodiment of the present invention;

[0042] Figure 4 yes Figure 2A schematic diagram of an implementation process of step S20;

[0043] Figure 5 is a schematic structural diagram of a vehicle active noise reduction device in one embodiment of the present invention;

[0044] Figure 6 1 is another structural schematic diagram of a vehicle active noise reduction device in one embodiment of the present invention. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] The vehicle active noise reduction method provided by the embodiment of the present invention can be applied in the following aspects: Figure 1 In the vehicle active noise reduction system, the vehicle includes a vehicle active noise reduction device and a vehicle active noise reduction control system. The vehicle active noise reduction device communicates with the vehicle active noise reduction control system through a network. The vehicle active noise reduction device is used to determine the target reference signal and its collection position by simulation, and record the collection position of the target reference signal as the noise source reference signal collection position of the active noise reduction control system; the active noise reduction control system is used to collect the reference signal in the calibrated noise source reference signal collection position, and then calculate the correction signal with the same frequency, equal amplitude and opposite phase as the noise signal in the vehicle according to the reference signal, and control the audio player to send the correction signal, so as to use the principle of sound wave interference to achieve the purpose of noise reduction.

[0047] The vehicle active noise reduction device needs to first obtain noise source signals at multiple different positions obtained by performing actual vehicle tests on the vehicle, then divide the multiple noise source signals into multiple reference signals, and simulate the in-vehicle noise reduction of the vehicle according to the multiple reference signals to obtain a simulated noise reduction effect corresponding to each reference signal, each reference signal includes at least one noise source signal, and each reference signal includes different noise source signals, and then determine a target reference signal from the multiple reference signals according to the simulated noise reduction effect corresponding to each reference signal, and set the collection position of the target reference signal as the noise source reference signal collection position of the active noise reduction control system in the vehicle; in the present invention, by obtaining the actual vehicle noise source signal as a simulation variable, the noise reduction effect of the noise source reference signal at different positions is verified in the form of simulation, and the optimal target reference signal collection position is directly determined based on the noise reduction effect obtained by simulation, so that accurate noise source reference signals can be collected during driving as input of the vehicle active noise reduction control system, thereby improving the noise reduction effect of the vehicle active noise reduction control system.

[0048] In one embodiment, if Figure 2 As shown, a vehicle active noise reduction method is provided, and the method is applied in Figure 1 The server in the example is used as an example to illustrate the process, including the following steps:

[0049] S10: Acquire noise source signals at multiple different positions obtained by performing an actual vehicle test on the vehicle.

[0050] The vehicle active noise reduction device needs to be tested on the vehicle first, so as to collect noise-related data on the vehicle, including the in-vehicle noise signal and noise source signals at multiple different locations, that is, the noise source signals are collected at different locations on the vehicle. Among them, the in-vehicle noise signal is the noise signal heard by the ears of the people in the vehicle, and the noise source signal is the vibration signal or sound signal that causes the noise in the vehicle.

[0051] Among them, taking road noise as an example, the road noise comes from the vibration at the attachment point between the chassis and the body, that is, the noise source signal of the road noise is usually the chassis vibration signal, so the corresponding position of the noise source of the road noise is the position at the attachment point between the chassis and the body. Before the actual vehicle test of the vehicle, it is necessary to arrange acceleration sensors (such as three-way acceleration sensors) at all attachment points between the chassis and the body to collect the chassis acceleration signal caused by road excitation as the noise source signal; arrange a microphone on the headrest of the driver's seat (or all seats) in the cab to collect the in-car noise signal caused by road excitation. During the actual vehicle test of the vehicle, the actual vehicle is controlled to travel at a fixed speed, and the data sampling rate is set (the sampling rate is not less than 24kHz), and the chassis vibration acceleration signal (that is, the noise source signal) and the in-car noise signal collected by the acceleration sensor are synchronously recorded.

[0052] In this embodiment, the chassis vibration acceleration signal is only an exemplary signal, and the noise source signal may also be other signals or a combination of various signals, such as an engine speed signal, or a combination of an engine speed signal and a chassis vibration acceleration signal.

[0053] S20: Divide the multiple noise source signals into multiple reference signals, and perform in-vehicle noise reduction simulation on the vehicle according to the multiple reference signals to obtain a simulated noise reduction effect corresponding to each reference signal.

[0054] After acquiring multiple noise source signals at different positions of the vehicle, the multiple noise source signals are divided into multiple reference signals, wherein each reference signal includes at least one noise source signal, and each reference signal includes different noise source signals, that is, the noise source signals included in each reference signal are not completely the same. Then, the vehicle is simulated for in-vehicle noise reduction according to the multiple reference signals to obtain the simulated noise reduction effect corresponding to each reference signal. In the simulation process, the reference signal is used as a variable and the in-vehicle noise signal is used as a target to simulate the in-vehicle noise reduction of the vehicle to obtain the simulated noise reduction effect corresponding to each reference signal.

[0055] S30: determining a target reference signal from a plurality of reference signals according to the simulated noise reduction effects corresponding to the reference signals, and setting a collection position of the target reference signal as a noise source reference signal collection position of the active noise reduction control system in the vehicle.

[0056] After simulating the in-vehicle noise reduction of the vehicle with the reference signal as a variable and obtaining the simulated noise reduction effect corresponding to each reference signal, a target reference signal with the best simulated noise reduction effect is determined from multiple reference signals according to the simulated noise reduction effect corresponding to each reference signal, and a collection position of the target reference signal is determined, and then the collection position of the target reference signal is set as the noise source reference signal collection position of the active noise reduction control system in the vehicle, so that in the subsequent driving process of the vehicle, the reference signal of the noise source collected at the noise source reference signal collection position is used as the active noise reduction control system, thereby calculating a more accurate correction signal, and then playing the correction signal to obtain a better noise reduction effect.

[0057] It should be understood that the method for selecting reference signals in traditional active noise control technology is to obtain noise source signals at different positions through sensor acquisition, and then use the principle of multiple coherence to calculate the coherence coefficient between the noise source signal and the in-vehicle noise signal, select the noise source signal with a high coherence coefficient with the in-vehicle noise signal as the alternative reference signal, and then verify the actual noise reduction effect of the alternative reference signal on the actual vehicle. However, the alternative reference signal obtained indirectly from the coherence principle is not accurate enough, resulting in the vehicle active noise control system with the alternative reference signal as input. The noise reduction effect is often poor, so it is necessary to repeatedly change the alternative reference signal until the noise reduction effect of the actual vehicle reaches the target. This method has low efficiency in selecting reference signals. In this embodiment, by obtaining the noise source signal of the actual vehicle as a simulation variable, the noise reduction effect of the reference signal of the noise source at different positions is verified in the form of simulation, and the optimal target reference signal acquisition position is directly determined based on the noise reduction effect obtained by simulation. The selection standard is direct and accurate, and there is no need to conduct multiple actual vehicle tests for repeated verification. The reference signal selection method is simple, efficient, and easy to operate.

[0058] In this embodiment, noise source signals at multiple different positions obtained by performing an actual vehicle test on the vehicle are obtained, and then the multiple noise source signals are divided into multiple reference signals, and the vehicle is simulated for in-vehicle noise reduction according to the multiple reference signals to obtain a simulated noise reduction effect corresponding to each reference signal, each reference signal includes at least one noise source signal, and each reference signal includes a different noise source signal, and then according to the simulated noise reduction effect corresponding to each reference signal, a target reference signal is determined from the multiple reference signals, and the collection position of the target reference signal is set as the noise source reference signal collection position of the active noise reduction control system in the vehicle; by obtaining the actual vehicle noise source signal as a simulation variable, the noise reduction effect of the noise source reference signal at different positions is verified in the form of simulation, and the optimal target reference signal collection position is directly determined based on the noise reduction effect obtained by simulation, so that accurate noise source reference signals can be collected during driving as input of the vehicle active noise reduction control system, thereby improving the noise reduction effect of the vehicle active noise reduction control system.

[0059] In one embodiment, in step S20, the multiple noise source signals are divided into multiple reference signals, which specifically includes the following steps:

[0060] S201: Subdivide the position corresponding to the noise source into multiple collection areas.

[0061] Taking road noise as an example, the road noise comes from the vibration at the attachment point between the chassis and the vehicle body, that is, the noise source signal of the road noise is usually the chassis vibration signal, and thus the corresponding position of the noise source of the road noise is the position at the attachment point between the chassis and the vehicle body, and such attachment point position is usually around the wheel, and thus the corresponding position of the noise source of the road noise (i.e. the attachment point position between the chassis and the vehicle body) can be subdivided into multiple collection areas according to the wheel position, for example, the multiple collection areas include the left front area centered on the left front tire, the right front area centered on the right front tire, the left rear area centered on the left rear tire, and the right rear area centered on the right rear tire. In other embodiments, the multiple collection areas can also change according to the change of the noise source, for example, if the noise source of the vehicle engine noise is the engine, then the corresponding position of the noise source can be the engine speed collection position, and the conventional engine speed collection position is subdivided into multiple collection areas.

[0062] After the corresponding position of the noise source is subdivided into multiple collection areas, multiple sensors are placed in each collection area to collect the noise source signal through the sensors. For example, if the noise source signal of road noise is a chassis vibration signal, it is necessary to set multiple acceleration sensors in the left front area, the right front area, the left rear area and the right rear area respectively (to ensure accuracy, they can be three-way acceleration sensors) to collect the vibration acceleration signal of the attachment point between the chassis and the body as the noise source signal.

[0063] S202: Divide the plurality of noise source signals into a plurality of signal groups according to the acquisition position of each noise source signal.

[0064] After the positions corresponding to the noise sources are subdivided into a plurality of acquisition areas, the plurality of noise source signals are divided into a plurality of signal groups according to the acquisition positions of the noise source signals (ie, the sensor placement positions), and each signal group corresponds to a acquisition area.

[0065] S203: Select any noise source signal in each signal group and randomly combine them to obtain multiple reference signals.

[0066] After dividing a plurality of noise source signals into a plurality of signal groups according to the acquisition position of each noise source signal, any noise source signal is selected in each signal group and randomly combined to obtain a plurality of reference signals, that is, each reference signal includes a noise source signal in each signal group, and the number of reference signals is the product of the number of noise source signals in each signal group.

[0067] For example, Figure 3 As shown, the corresponding position of the noise source of the road noise is the attachment point between the chassis and the vehicle body, and an acceleration sensor is placed at the attachment point to collect noise source signals, wherein the noise source signal collection area of ​​the road noise is divided into a left front area centered on the left front tire, a right front area centered on the right front tire, a left rear area centered on the left rear tire, and a right rear area centered on the right rear tire according to the wheels, and the collected multiple noise source signals are divided into 4 signal groups according to the collection position of each noise source signal, namely, M1 signal group, M2 signal group, M3 signal group and M4 signal group, wherein the M1 signal group includes multiple noise source signals, which are x 1 、x 2 ……x M1 ; The M2 signal group includes multiple noise source signals, namely x 1 、x 2 ……x M2 ; The M3 signal group includes multiple noise source signals x 1 、x 2 ……x M3 , the M4 signal group includes multiple noise source signals x 1 、x 2 ……x M4 ; Take out any noise source signal from the M1 signal group, the M2 signal group, the M3 signal group and the M4 signal group, respectively, and record them as x m1 、x m2 、x m3 and x m4 , x m1 、x m2 、x m3 and x m4A set of reference signals is formed, denoted as X i (n), where i = 1, 2, ..., M1*M2*M3*M4, i.e., the number of reference signals is the product of the number of noise source signals in the M1 signal group, the M2 signal group, the M3 signal group, and the M4 signal group. By dividing the corresponding position of the noise source of the road noise into 4 collection areas according to the wheels to collect the noise source model, the diversity of the noise source signal collection position is improved, and then the noise source signal is classified according to the collection position to obtain 4 signal groups, and any noise source signal is selected from each signal group and randomly combined to obtain multiple reference signals, which can ensure that each reference signal contains the noise source signal of each collection area, providing an accurate basis for the subsequent selection of accurate target reference signals.

[0068] In other embodiments, multiple noise source signals may be randomly combined to form multiple incompletely overlapping reference signals, that is, each reference signal may contain a different noise source signal.

[0069] In this embodiment, the corresponding position of the noise source is subdivided into multiple collection areas, and according to the collection position of each noise source signal, the multiple noise source signals are divided into multiple signal groups, each signal group corresponds to a collection area, and finally any noise source signal is selected in each signal group and randomly combined to obtain multiple reference signals. The specific steps of dividing the multiple noise source signals into multiple reference signals are clarified, and the corresponding position of the noise source is divided into multiple collection areas according to the wheel to collect the noise source model, thereby improving the diversity of the noise source signal collection position. Then, the noise source signal is classified according to the collection position to obtain multiple signal groups, and any noise source signal is selected in each signal group and randomly combined to obtain multiple reference signals. It can ensure that each reference signal contains the noise source signals of each collection area, providing an accurate basis for the subsequent selection of accurate target reference signals.

[0070] In one embodiment, if Figure 4 As shown, in step S20, the vehicle interior noise reduction simulation is performed on the vehicle according to multiple reference signals to obtain the simulated noise reduction effect corresponding to each reference signal, which specifically includes the following steps:

[0071] S21: Determine multiple groups of simulation input parameters according to an active noise reduction algorithm of the active noise reduction control system.

[0072] After dividing the multiple noise source signals into multiple reference signals, multiple groups of simulation input parameters are determined according to the active noise reduction algorithm of the active noise reduction control system on the vehicle, wherein different active noise reduction algorithms correspond to different input parameters. Each group of simulation input parameters at least includes an in-vehicle noise signal and a reference signal, and the reference signal of each group of simulation input parameters is different, that is, other parameters in the input parameters are constants, and the reference signal is a variable, and the number of groups of multiple groups of simulation input parameters is the number of multiple reference signals.

[0073] Taking the active noise reduction algorithm as the least mean square algorithm (LMS) as an example, each set of simulation input parameters includes an in-vehicle noise signal and a reference signal.

[0074] S22: Inputting the simulation input parameters into the active noise reduction control system to perform in-vehicle noise reduction simulation to obtain a total noise reduction amount, and determining a simulation noise reduction effect corresponding to a reference signal in the simulation input parameters according to the total noise reduction amount.

[0075] S23: Traversing all simulation input parameters until a simulation noise reduction effect corresponding to each reference signal is obtained.

[0076] After determining multiple groups of simulation input parameters, one group of simulation input parameters is input into the active noise reduction control system for calculation based on the active noise reduction algorithm, so as to simulate the in-vehicle noise reduction through the active noise reduction control system, thereby obtaining the total noise reduction amount that can be achieved by the active noise reduction control system (in the entire noise reduction simulation process or within a preset frequency band), and determining the simulated noise reduction effect corresponding to the reference signal in the simulation input parameters according to the total noise reduction amount. Among them, the total noise reduction amount can be used as the simulated noise reduction effect corresponding to the reference signal in the simulation input parameters, and the total noise reduction amount can be used as the noise reduction effect, which is simple, convenient and easy to quantify.

[0077] Finally, all simulation input parameters are traversed, that is, each remaining simulation input parameter is input into the active noise reduction control system for calculation based on the active noise reduction algorithm, so as to perform in-vehicle noise reduction simulation through the active noise reduction control system, thereby obtaining the total noise reduction amount that can be achieved by the active noise reduction control system (in the entire noise reduction simulation process or within a preset frequency band), and determining the simulated noise reduction effect corresponding to the reference signal in the simulation input parameter according to the total noise reduction amount, until all simulation input parameters are traversed, thereby obtaining the simulated noise reduction effect corresponding to each reference signal.

[0078] In this embodiment, multiple groups of simulation input parameters are determined according to the active noise reduction algorithm of the active noise reduction control system, the simulation input parameters include at least an in-vehicle noise signal and a reference signal, and the reference signal of each group of simulation input parameters is different, and then the simulation input parameters are input into the active noise reduction control system to perform in-vehicle noise reduction simulation to obtain a total noise reduction amount, and the simulation noise reduction effect corresponding to the reference signal in the simulation input parameters is determined according to the total noise reduction amount, and all simulation input parameters are traversed until the simulation noise reduction effect corresponding to each reference signal is obtained. The specific steps of performing in-vehicle noise reduction simulation on the vehicle according to multiple reference signals to obtain the simulation noise reduction effect corresponding to each reference signal are clarified, and the simulation input parameters are determined according to the active noise reduction algorithm of the active noise reduction control system on the vehicle to complete the in-vehicle noise reduction simulation, so that the simulation noise reduction result is close to the actual vehicle noise reduction effect, and the noise reduction effect is determined according to the total noise reduction amount, which is easy to quantify.

[0079] In one embodiment, after step S21, the simulation input parameters are input into the active noise reduction control system to perform in-vehicle noise reduction simulation to obtain a total noise reduction amount, and the simulation noise reduction effect corresponding to the reference signal in the simulation input parameters is determined according to the total noise reduction amount, specifically including the following steps:

[0080] S211: Inputting the simulation input parameters into the active noise reduction control system to perform in-vehicle noise reduction simulation to determine the total noise reduction amount of the active noise reduction control system within a preset frequency band, and determine the noise reduction amount of the active noise reduction control system at each main frequency point.

[0081] After determining multiple sets of simulation input parameters according to the active noise reduction algorithm of the active noise reduction control system, it is necessary to perform spectrum analysis on the in-vehicle noise signal to determine multiple main frequency points (i.e., common peak points of the spectrum) of the in-vehicle noise signal within the preset frequency range, that is, the main frequency points are the frequency points corresponding to the peaks in the preset frequency range determined after the spectrum analysis of the in-vehicle noise signal. Among them, the preset frequency range is a pre-calibrated frequency range of common in-vehicle noise. The preset frequency range can be a calibrated fixed frequency range (such as 40Hz-400Hz); the preset frequency range can also be a frequency range calibrated after actual vehicle tests on different vehicles. Different vehicles have different in-vehicle noise frequency ranges. The accuracy of the preset frequency range can be improved by calibrating the preset frequency range after the actual vehicle test.

[0082] After determining multiple main frequency points of the in-vehicle noise signal within the preset frequency band, a set of simulation input parameters is input into the active noise reduction control system for calculation based on the active noise reduction algorithm, so as to perform in-vehicle noise reduction simulation through the active noise reduction control system to determine the total noise reduction amount that can be achieved by the active noise reduction control system within the preset frequency band, and determine the noise reduction amount of the active noise reduction control system at each main frequency point.

[0083] When the simulation input parameters are input into the active noise reduction control system for in-vehicle noise reduction simulation, the total noise reduction amount Δ that the active noise control system can achieve within the preset frequency range (40Hz-400Hz) when using this set of simulation input parameters is recorded. i , and the simulated noise reduction that the active noise control system can achieve at the main frequency points (f1, f2, f3...), respectively denoted as Δ i 1. Δ i 2. Δ i 3…….

[0084] S212: Record the sum of the noise reduction amounts of the active noise reduction control system at each main frequency point as the total noise reduction amount at the main frequency point.

[0085] S213: The total noise reduction amount and the total noise reduction amount of the main frequency point are used as the simulated noise reduction effect corresponding to the reference signal in the input parameters.

[0086] After inputting the simulation input parameters into the active noise reduction control system to perform in-vehicle noise reduction simulation to determine the total noise reduction amount of the active noise reduction control system within a preset frequency band and the noise reduction amount of the active noise reduction control system at each main frequency point, the sum of the noise reduction amounts of the active noise reduction control system at each main frequency point is calculated and the sum is recorded as the total noise reduction amount at the main frequency point.

[0087] Then, the total noise reduction amount and the total noise reduction amount of the main frequency points are used as the simulated noise reduction effect corresponding to the reference signal in the input parameters, that is, the total noise reduction amount of the active noise reduction control system in the preset frequency band and the sum of the noise reduction amounts at each main frequency point are used together as the simulated noise reduction effect corresponding to the reference signal in the input parameters.

[0088] In this embodiment, the simulation input parameters are first input into the active noise reduction control system to perform in-vehicle noise reduction simulation to determine the total noise reduction amount of the active noise reduction control system within a preset frequency range, and the noise reduction amount of the active noise reduction control system at each main frequency point is determined. Then, the sum of the noise reduction amounts of the active noise reduction control system at each main frequency point is recorded as the total noise reduction amount of the main frequency point. The main frequency point is the frequency point corresponding to the peak value in the preset frequency range determined after performing spectrum analysis on the in-vehicle noise signal. Finally, the total noise reduction amount and the total noise reduction amount of the main frequency point are used as the simulated noise reduction effect corresponding to the reference signal in the input parameters, which clarifies the input of the simulation input parameters into the active noise reduction control system. The in-vehicle noise reduction simulation is performed to obtain the total noise reduction amount, and the specific steps of determining the simulated noise reduction effect corresponding to the reference signal in the simulation input parameters according to the total noise reduction amount, and the simulation input parameters are determined according to the active noise reduction algorithm of the active noise reduction control system on the vehicle to complete the in-vehicle noise reduction simulation, so that the simulated noise reduction result is close to the actual vehicle noise reduction effect, and the total noise reduction amount of the active noise reduction control system in a preset frequency band and the sum of the noise reduction amounts at each main frequency point are taken together as the noise reduction effect, which is easy to quantify, and the noise reduction amount of the vehicle at different main frequency points (peak values) of the in-vehicle noise is taken into account, and the noise reduction effect is quantified from different dimensions, thereby improving the accuracy of the noise reduction effect.

[0089] In other embodiments, after the simulation input parameters are input into the active noise reduction control system to perform in-vehicle noise reduction simulation to determine the total noise reduction amount of the active noise reduction control system within a preset frequency band, the total noise reduction amount of the active noise reduction control system within the preset frequency band can be directly recorded as the simulated noise reduction effect corresponding to the reference signal in the simulation input parameters, which is simple, convenient and easy to quantify.

[0090] In one embodiment, in step S21, that is, determining multiple sets of simulation input parameters according to the active noise reduction algorithm of the active noise reduction control system, specifically includes the following steps:

[0091] S211: When the active noise reduction algorithm is a minimum mean square algorithm based on X-filtering, an estimated value of a secondary path impulse response function of the actual vehicle is obtained.

[0092] When the active noise reduction algorithm is a Filtered-X Least Mean Square (FXLMS) algorithm based on X-filtering, the input parameters of the FXLMS algorithm also include an estimated value of the secondary path impulse response function, so it is also necessary to obtain an estimated value of the secondary path impulse response function of the actual vehicle. The estimated value of the secondary path impulse response function is obtained by conducting an actual vehicle test on the vehicle.

[0093] It should be understood that after the vehicle active noise control system is installed on the actual vehicle, the path through which the control signal generated by the system passes is defined as the secondary path, which mainly includes the electrical path formed by the controller of the active noise control system, the vehicle speaker, the power amplifier and the error microphone, and the spatial path from the vehicle speaker to the error microphone. The estimated value of the secondary path impulse response function of the actual vehicle is obtained through identification.

[0094] S211: combining the in-vehicle noise signal, the estimated value of the secondary path impulse response function, and any reference signal into a set of simulation input parameters to obtain multiple sets of simulation input parameters.

[0095] After obtaining the estimated value of the secondary path impulse response function of the actual vehicle, the in-vehicle noise signal, the estimated value of the secondary path impulse response function, and any reference signal are combined into a set of simulation input parameters. Then, the in-vehicle noise signal and the estimated value of the secondary path impulse response function are used as constants, and the reference signal is changed to obtain multiple sets of simulation input parameters.

[0096] The FxLMS algorithm has the characteristics of low computational complexity, good convergence in an environment where the signal is a stationary signal, unbiased convergence of its expected value to the Wiener solution, and stationarity when the algorithm is implemented using finite precision, making the LMS algorithm the most stable and widely used algorithm among adaptive filtering algorithms. Therefore, it can be used as a benchmark algorithm for vehicle active noise reduction control systems, which is simple to implement and has a small amount of calculation. In other embodiments, the active noise reduction algorithm can also be the FXNLMS (Filtered-XNormalized Least Mean Square) algorithm, that is, a normalized least mean square algorithm based on X-filtering.

[0097] In this embodiment, when the active noise reduction algorithm is a minimum mean square algorithm based on X-filtering, an estimated value of the secondary path impulse response function of the actual vehicle is obtained, and the in-vehicle noise signal, the estimated value of the secondary path impulse response function, and any reference signal are combined into a set of simulation input parameters to obtain multiple sets of simulation input parameters. The specific steps for determining multiple sets of simulation input parameters according to the active noise reduction algorithm of the active noise reduction control system are clarified, and the in-vehicle noise signal, the estimated value of the secondary path impulse response function, and any reference signal are combined into a set of simulation input parameters to perform in-vehicle noise reduction simulation, taking into account the influence of the secondary path on the noise reduction effect, thereby improving the accuracy of the subsequent noise reduction effect.

[0098] In one embodiment, the simulated noise reduction effect is represented by a total noise reduction amount in a preset frequency band. In step S30, a target reference signal is determined from a plurality of reference signals according to the simulated noise reduction effect corresponding to each reference signal, which specifically includes the following steps:

[0099] SA31: Compare the total noise reduction amounts corresponding to the reference signals to determine the total noise reduction amount with the largest value;

[0100] SA32: The reference signal corresponding to the maximum total noise reduction amount is used as the target reference signal.

[0101] In this embodiment, if the simulated noise reduction effect is represented by the total noise reduction amount within a preset frequency band, different reference signals correspond to their own total noise reduction amounts. At this time, it is necessary to compare the total noise reduction amounts corresponding to the reference signals to determine the total noise reduction amount with the largest value, and then use the reference signal corresponding to the total noise reduction amount with the largest value as the target reference signal. When there are multiple reference signals corresponding to the total noise reduction amount with the largest value, that is, the total noise reduction amounts corresponding to the multiple reference signals are the same, and they are listed as the total noise reduction amount with the largest value, then the multiple reference signals are all target reference signals, and one can be selected as the final target reference signal according to the actual installation requirements. Then the collection position corresponding to the selected target reference signal is recorded as the noise source reference signal collection position in the vehicle active noise reduction control system.

[0102] In this embodiment, the reference signal corresponding to the total noise reduction amount with the largest value is used as the target reference signal, and the target reference signal is used as the input of the vehicle active noise reduction control system. The total noise reduction amount is the highest and the noise reduction effect is the best. The collection position corresponding to the target reference signal is recorded as the noise source reference signal collection position in the vehicle active noise reduction control system, so that the real-time noise source reference signal can be collected at the collection position and input into the active noise reduction control system later, so as to calculate and obtain the most accurate correction signal and play it, so as to minimize the noise in the vehicle and obtain the best noise reduction effect.

[0103] In this embodiment, when the simulated noise reduction effect is represented by the total noise reduction amount within a preset frequency band, the total noise reduction amounts corresponding to the reference signals are compared to determine the total noise reduction amount with the largest value, and the reference signal corresponding to the total noise reduction amount with the largest value is used as the target reference signal. The specific process of determining the target reference signal among multiple reference signals according to the simulated noise reduction effect is clarified, and the reference signal corresponding to the total noise reduction amount with the largest value is used as the target reference signal. The collection position corresponding to the target reference signal is used to record the collection position of the noise source reference signal in the vehicle active noise reduction control system, which is simple and direct while ensuring the noise reduction effect.

[0104] In one embodiment, the simulated noise reduction effect is represented by the total noise reduction amount of the active noise reduction control system in a preset frequency band and the total noise reduction amount of the main frequency points. In step S30, that is, according to the simulated noise reduction effect corresponding to each reference signal, a target reference signal is determined from multiple reference signals, which specifically includes the following steps:

[0105] SB31: comparing the total noise reduction amounts corresponding to the reference signals, determining the total noise reduction amount with the largest value, and determining whether the total noise reduction amount with the largest value corresponds to multiple reference signals.

[0106] When the simulated noise reduction effect is represented by the total noise reduction amount within a preset frequency band and the noise reduction amount at each major frequency point, the simulated noise reduction effect is represented in a relatively multi-dimensional manner. At this time, it is necessary to compare the total noise reduction amounts corresponding to each reference signal to determine the total noise reduction amount with the largest value. After determining the total noise reduction amount with the largest value, it can be determined whether the total noise reduction amount with the largest value corresponds to multiple reference signals, and an optimal reference signal is selected as the target reference signal based on the determination result.

[0107] SB32: If the total noise reduction amount with the largest value corresponds to a reference signal, the reference signal corresponding to the total noise reduction amount with the largest value is used as the target reference signal.

[0108] After determining whether the total noise reduction amount with the largest value corresponds to multiple reference signals, if the total noise reduction amount with the largest value corresponds to one reference signal, it means that at this reference signal, the active noise reduction control system has the best noise reduction effect within the preset frequency band. Then, the total noise reduction amount with the largest value is taken as a benchmark, and the reference signal corresponding to the total noise reduction amount with the largest value is taken as the target reference signal, without considering the noise reduction amount of the active noise reduction control system at each major frequency point of the in-vehicle noise signal.

[0109] SB33: If the total noise reduction amount with the largest value corresponds to multiple reference signals, the multiple reference signals corresponding to the total noise reduction amount with the largest value are recorded as pending reference signals, and the pending reference signal corresponding to the total noise reduction amount of the main frequency point with the largest value is used as the target reference signal.

[0110] After determining whether the total noise reduction amount with the largest value corresponds to multiple reference signals, if the total noise reduction amount with the largest value corresponds to multiple reference signals, the corresponding multiple reference signals are recorded as pending reference signals. It is necessary to measure the noise reduction effect corresponding to different reference signals according to the noise reduction amount of each main frequency point of the in-vehicle noise signal of the active noise reduction control system. It is necessary to determine the total noise reduction amount of the main frequency point with the largest value among the total noise reduction amounts of multiple main frequency points according to the total noise reduction amount of each pending reference signal, and then use the pending reference signal corresponding to the total noise reduction amount of the main frequency point with the largest value as the target reference signal. When the total noise reduction amount is consistent, the larger the total noise reduction amount of the main frequency point, the better the noise reduction effect on the in-vehicle noise at the frequency peak, the smoother the in-vehicle noise received by the human ear, the minimum impact on the occupants, and the better the noise reduction effect.

[0111] The undetermined reference signal corresponding to the total amount of noise reduction at the main frequency point with the largest value is used as the target reference signal, and then the target reference signal is used as the input of the vehicle active noise reduction control system. Not only the total noise reduction amount is the largest, but also the noise reduction amount at the main frequency points of each vehicle interior noise is the highest, and the noise reduction effect is optimal. The collection position corresponding to the target reference signal is recorded as the noise source reference signal collection position in the vehicle active noise reduction control system, so that the real-time noise source reference signal can be collected at the collection position later and input into the active noise reduction control system, so as to calculate and obtain the most accurate correction signal and play it, so as to minimize the amount of noise in the vehicle and obtain the best noise reduction effect.

[0112] In this embodiment, when the simulated noise reduction effect is represented by the total noise reduction amount and the total noise reduction amount of the main frequency point, it is necessary to first compare the total noise reduction amounts corresponding to the reference signals to determine the total noise reduction amount with the largest value, and determine whether the total noise reduction amount with the largest value corresponds to multiple reference signals; if the total noise reduction amount with the largest value corresponds to one reference signal, the corresponding reference signal is used as the target reference signal; if the total noise reduction amount with the largest value corresponds to multiple reference signals, the corresponding multiple reference signals are recorded as pending reference signals, and the pending reference signal corresponding to the total noise reduction amount of the main frequency point with the largest value is used as the target reference signal. The specific steps of determining the target reference signal from multiple reference signals according to the simulated noise reduction effect are clarified. When the total noise reduction amounts of multiple reference signals are consistent, the reference signal with the largest total noise reduction amount of the main frequency point is selected as the target reference signal, so that the collection position of the target reference signal can be used as the noise source reference signal collection position of the active noise reduction control system in the future, so that the subsequent active noise reduction control system can collect more accurate noise source reference signals as input to achieve better noise reduction effect.

[0113] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0114] In one embodiment, a vehicle active noise reduction device is provided, and the vehicle active noise reduction device corresponds to the vehicle active noise reduction method in the above embodiment. Figure 5 As shown, the vehicle active noise reduction device includes an acquisition module 501, a simulation module 502 and a determination module 503. The detailed description of each functional module is as follows:

[0115] An acquisition module 501 is used to acquire noise source signals at multiple different positions obtained by performing a real vehicle test on the vehicle;

[0116] A simulation module 502 is used to divide the multiple noise source signals into multiple reference signals, and perform in-vehicle noise reduction simulation on the vehicle according to the multiple reference signals to obtain a simulated noise reduction effect corresponding to each reference signal, each reference signal includes at least one noise source signal, and each reference signal includes a different noise source signal;

[0117] The determination module 503 is used to determine a target reference signal from multiple reference signals according to the simulated noise reduction effects corresponding to each reference signal, and set the collection position of the target reference signal to the noise source reference signal collection position of the active noise reduction control system in the vehicle.

[0118] Furthermore, the simulation module 502 is specifically used for:

[0119] Inputting the simulation input parameters into the active noise reduction control system to perform in-vehicle noise reduction simulation to obtain a total noise reduction amount, and determining a simulation noise reduction effect corresponding to a reference signal in the simulation input parameters according to the total noise reduction amount;

[0120] All simulation input parameters are traversed until the simulation noise reduction effect corresponding to each reference signal is obtained.

[0121] Furthermore, the simulation module 502 is also specifically used for:

[0122] Inputting the simulation input parameters into the active noise reduction control system to perform in-vehicle noise reduction simulation to determine the total noise reduction amount of the active noise reduction control system within a preset frequency band, and to determine the noise reduction amount of the active noise reduction control system at each major frequency point;

[0123] The sum of the noise reduction amounts of the active noise reduction control system at each main frequency point is recorded as the total noise reduction amount at the main frequency point, where the main frequency point is the frequency point corresponding to the peak value in the preset frequency range determined after spectrum analysis of the vehicle interior noise signal;

[0124] The total noise reduction amount and the total noise reduction amount of the main frequency point are used as the simulated noise reduction effect corresponding to the reference signal in the input parameters.

[0125] Furthermore, the simulation module 502 is also specifically used for:

[0126] When the active noise reduction algorithm is a minimum mean square algorithm based on X-filtering, an estimated value of the secondary path impulse response function of the actual vehicle is obtained;

[0127] The vehicle interior noise signal, the estimated value of the secondary path impulse response function, and any reference signal are combined into a set of simulation input parameters to obtain multiple sets of simulation input parameters.

[0128] Furthermore, the simulation module 502 is also specifically used for:

[0129] Subdivide the position corresponding to the noise source into multiple collection areas;

[0130] According to the collection position of each noise source signal, the multiple noise source signals are divided into multiple signal groups, each signal group corresponds to a collection area;

[0131] Any noise source signal is selected in each signal group and randomly combined to obtain multiple reference signals.

[0132] Furthermore, the simulated noise reduction effect is represented by the total noise reduction amount in a preset frequency band, and the determination module 503 is specifically used for:

[0133] Compare the total noise reduction amounts corresponding to the reference signals to determine the total noise reduction amount with the largest value;

[0134] The reference signal corresponding to the total noise reduction amount with the largest value is used as the target reference signal.

[0135] Furthermore, the simulated noise reduction effect is represented by the total noise reduction amount and the total noise reduction amount of the main frequency points. The determination module 503 is further specifically used for:

[0136] Comparing the total noise reduction amounts corresponding to the reference signals, determining the total noise reduction amount with the largest value, and determining whether the total noise reduction amount with the largest value corresponds to multiple reference signals;

[0137] If the total noise reduction amount with the largest value corresponds to a reference signal, the reference signal corresponding to the total noise reduction amount with the largest value is used as the target reference signal;

[0138] If the total noise reduction amount with the largest value corresponds to multiple reference signals, the multiple reference signals corresponding to the total noise reduction amount with the largest value are recorded as pending reference signals, and the pending reference signal corresponding to the total noise reduction amount of the largest main frequency point is used as the target reference signal.

[0139] For the specific definition of the vehicle active noise reduction device, please refer to the definition of the vehicle active noise reduction method above, which will not be repeated here. Each module in the above-mentioned vehicle active noise reduction device can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0140] In one embodiment, a vehicle active noise reduction device is provided, which can be a computer device. The vehicle active noise reduction device includes a processor, a memory, a network interface, a display screen, and an input device connected via a system bus. Among them, the processor of the vehicle active noise reduction device is used to provide computing and control capabilities. The memory of the vehicle active noise reduction device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the vehicle active noise reduction device is used to communicate with an external device via a network connection. When the computer program is executed by the processor, a vehicle active noise reduction method is implemented.

[0141] In one embodiment, Figure 6 As shown, a vehicle active noise reduction device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following steps are implemented:

[0142] Acquire noise source signals at multiple different positions obtained by performing a real vehicle test on the vehicle;

[0143] Dividing the multiple noise source signals into multiple reference signals, and performing in-vehicle noise reduction simulation on the vehicle according to the multiple reference signals to obtain a simulated noise reduction effect corresponding to each reference signal, wherein each reference signal includes at least one noise source signal, and each reference signal includes a different noise source signal;

[0144] According to the simulated noise reduction effects corresponding to the reference signals, a target reference signal is determined from the multiple reference signals, and a collection position of the target reference signal is set as a noise source reference signal collection position of an active noise reduction control system in the vehicle.

[0145] In one embodiment, a readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0146] Acquire noise source signals at multiple different positions obtained by performing a real vehicle test on the vehicle;

[0147] Dividing the multiple noise source signals into multiple reference signals, and performing in-vehicle noise reduction simulation on the vehicle according to the multiple reference signals to obtain a simulated noise reduction effect corresponding to each reference signal, wherein each reference signal includes at least one noise source signal, and each reference signal includes a different noise source signal;

[0148] According to the simulated noise reduction effects corresponding to the reference signals, a target reference signal is determined from the multiple reference signals, and a collection position of the target reference signal is set as a noise source reference signal collection position of an active noise reduction control system in the vehicle.

[0149] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0150] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0151] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A vehicle active noise reduction method, characterized in that: include: Acquire noise source signals at multiple different positions obtained by performing a real vehicle test on the vehicle; Dividing the plurality of noise source signals into a plurality of reference signals, and performing an in-vehicle noise reduction simulation on the vehicle according to the plurality of reference signals to obtain a simulated noise reduction effect corresponding to each of the reference signals, wherein each of the reference signals includes at least one noise source signal, and each of the reference signals includes a different noise source signal; According to the simulated noise reduction effects corresponding to the reference signals, a target reference signal is determined from the multiple reference signals, and a collection position of the target reference signal is set as a noise source reference signal collection position of the active noise reduction control system in the vehicle; The performing of in-vehicle noise reduction simulation on the vehicle according to the plurality of reference signals to obtain a simulated noise reduction effect corresponding to each reference signal includes: Determining a plurality of groups of simulation input parameters according to the active noise reduction algorithm of the active noise reduction control system, wherein the simulation input parameters at least include the in-vehicle noise signal and the reference signal, and the reference signal of each group of the simulation input parameters is different; Inputting the simulation input parameters into the active noise reduction control system to perform in-vehicle noise reduction simulation to obtain a total noise reduction amount, and determining a simulation noise reduction effect corresponding to the reference signal in the simulation input parameters according to the total noise reduction amount; Traversing all the simulation input parameters until a simulation noise reduction effect corresponding to each reference signal is obtained; The step of inputting the simulation input parameters into the active noise reduction control system to perform in-vehicle noise reduction simulation to obtain a total noise reduction amount, and determining a simulation noise reduction effect corresponding to the reference signal in the simulation input parameters according to the total noise reduction amount includes: Inputting the simulation input parameters into the active noise reduction control system to perform in-vehicle noise reduction simulation to determine the total noise reduction amount of the active noise reduction control system within a preset frequency range, and determining the noise reduction amount of the active noise reduction control system at each main frequency point; The sum of the noise reduction amounts of the active noise reduction control system at each of the main frequency points is recorded as the total noise reduction amount of the main frequency points, wherein the main frequency points are the frequency points corresponding to the peak values ​​in the preset frequency range determined after the spectrum analysis of the vehicle interior noise signal; The total noise reduction amount and the total noise reduction amount of the main frequency point are used as the simulated noise reduction effect corresponding to the reference signal in the input parameter.

2. The vehicle active noise reduction method according to claim 1, characterized in that: The step of determining a plurality of groups of simulation input parameters according to the active noise reduction algorithm of the active noise reduction control system comprises: When the active noise reduction algorithm is a minimum mean square algorithm based on X-filtering, obtaining an estimated value of a secondary path impulse response function of the actual vehicle; The in-vehicle noise signal, the estimated value of the secondary path impulse response function, and any one of the reference signals are combined into a set of the simulation input parameters to obtain a plurality of sets of the simulation input parameters.

3. The vehicle active noise reduction method according to claim 1, characterized in that: The step of dividing the plurality of noise source signals into a plurality of reference signals comprises: Subdivide the position corresponding to the noise source into multiple collection areas; According to the collection position of each noise source signal, the plurality of noise source signals are divided into a plurality of signal groups, each of the signal groups corresponds to one collection area; Any noise source signal is selected from each of the signal groups and randomly combined to obtain a plurality of reference signals.

4. The vehicle active noise reduction method according to any one of claims 1 to 3, characterized in that: The simulated noise reduction effect is represented by a total noise reduction amount in a preset frequency band, and the target reference signal is determined from the plurality of reference signals according to the simulated noise reduction effect corresponding to each reference signal, including: Comparing the total noise reduction amounts corresponding to the reference signals, and determining the total noise reduction amount with the largest value; The reference signal corresponding to the total noise reduction amount with the largest value is used as the target reference signal.

5. The vehicle active noise reduction method according to any one of claims 1 to 3, characterized in that: The simulated noise reduction effect is represented by a total noise reduction amount and a total noise reduction amount at a main frequency point, and the target reference signal is determined from the plurality of reference signals according to the simulated noise reduction effect corresponding to each reference signal, including: Comparing the total noise reduction amounts corresponding to the reference signals, determining the total noise reduction amount with the largest value, and determining whether the total noise reduction amount with the largest value corresponds to multiple reference signals; If the total noise reduction amount with the largest value corresponds to one reference signal, the reference signal corresponding to the total noise reduction amount with the largest value is used as the target reference signal; If the total noise reduction amount with the largest value corresponds to multiple reference signals, the multiple reference signals corresponding to the total noise reduction amount with the largest value are recorded as pending reference signals, and the pending reference signal corresponding to the total noise reduction amount of the main frequency point with the largest value is used as the target reference signal.

6. A vehicle active noise reduction device, characterized in that: include: An acquisition module is used to acquire noise source signals at multiple different positions obtained by performing a real vehicle test on the vehicle; a simulation module, configured to divide the plurality of noise source signals into a plurality of reference signals, and perform an in-vehicle noise reduction simulation on the vehicle according to the plurality of reference signals to obtain a simulated noise reduction effect corresponding to each of the reference signals, wherein each of the reference signals includes at least one of the noise source signals, and each of the reference signals includes a different noise source signal; A determination module, configured to determine a target reference signal from the plurality of reference signals according to the simulated noise reduction effects corresponding to the reference signals, and set a collection position of the target reference signal as a noise source reference signal collection position of the active noise reduction control system in the vehicle; The performing of in-vehicle noise reduction simulation on the vehicle according to the plurality of reference signals to obtain a simulated noise reduction effect corresponding to each reference signal includes: Determining a plurality of groups of simulation input parameters according to the active noise reduction algorithm of the active noise reduction control system, wherein the simulation input parameters at least include the in-vehicle noise signal and the reference signal, and the reference signal of each group of the simulation input parameters is different; Inputting the simulation input parameters into the active noise reduction control system to perform in-vehicle noise reduction simulation to obtain a total noise reduction amount, and determining a simulation noise reduction effect corresponding to the reference signal in the simulation input parameters according to the total noise reduction amount; Traversing all the simulation input parameters until a simulation noise reduction effect corresponding to each reference signal is obtained; The step of inputting the simulation input parameters into the active noise reduction control system to perform in-vehicle noise reduction simulation to obtain a total noise reduction amount, and determining a simulation noise reduction effect corresponding to the reference signal in the simulation input parameters according to the total noise reduction amount includes: Inputting the simulation input parameters into the active noise reduction control system to perform in-vehicle noise reduction simulation to determine the total noise reduction amount of the active noise reduction control system within a preset frequency range, and determining the noise reduction amount of the active noise reduction control system at each main frequency point; The sum of the noise reduction amounts of the active noise reduction control system at each of the main frequency points is recorded as the total noise reduction amount of the main frequency points, wherein the main frequency points are the frequency points corresponding to the peak values ​​in the preset frequency range determined after the spectrum analysis of the vehicle interior noise signal; The total noise reduction amount and the total noise reduction amount of the main frequency point are used as the simulated noise reduction effect corresponding to the reference signal in the input parameter.

7. A vehicle active noise reduction device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the vehicle active noise reduction method according to any one of claims 1 to 5 are implemented.

8. A readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the vehicle active noise reduction method according to any one of claims 1 to 5 are implemented.

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