Vehicle

Abstract

The utility model relates to a vehicle. A control device comprises a microphone, a central control module and a loudspeaker. The microphones include a reference microphone and an error microphone. The central control module comprises a self-adaptive filter and a processing module, the microphone is electrically connected with the central control module, and the processing module is electrically connected with the self-adaptive filter. The loudspeaker is electrically connected with the central control module. Wherein the reference microphone and the error microphone respectively collect a reference noise signal and a cabin noise signal from the periphery of a wheel and in a vehicle cabin and transmit the reference noise signal and the cabin noise signal to the central control module, the processing module generates a reference noise reduction signal according to the reference noise signal and transmits the reference noise reduction signal to the loudspeaker, and the adaptive filter correspondingly outputs the cabin noise reduction signal to the loudspeaker. And the processing module updates the feature matrix of the adaptive filter in real time according to a preset algorithm. Therefore, the vehicle provided by the utility model can solve the problem of loud noise in the running process of the vehicle in the prior art.

Description

Technical Field

[0001] The utility model relates to the field of noise and vibration control, in particular to a vehicle. Background Art

[0002] When riding in an electric vehicle, especially when the vehicle speed is high, the noise inside the vehicle is very high, mainly including tire noise, air vortex noise, etc. The strong noise is not conducive to passengers' communication inside the vehicle, and driving in a noisy environment for a long time is very likely to cause fatigue. The utility model relates to the field of noise control, especially to an active noise reduction control device for electric vehicles.

[0003] The active noise control devices used in vehicles generally adopt a structure of feedforward, feedback or a combination of feedforward and feedback to attenuate the target noise source. The traditional road noise active control method based on time-domain algorithm has a high calculation cost and a slow convergence speed, which is not conducive to the productization of RNC (Radio Network Controller) technology. Moreover, when the vehicle is running, the road surface may change suddenly, such as from a smooth asphalt road surface to a gravel road surface. If the main parameters of the RNC device are fixed values, such as the convergence step size, error signal gain, etc., it may take several minutes to achieve the best road noise cancellation effect, because the RNC device starts to adapt to the gravel road surface from the state of adapting to the smooth asphalt road surface. During the initial adaptation period of the RNC device, the noise level inside the cabin at the listener's ear position is not optimal, and it may also be higher than the level when the device is fully adapted, which is not conducive to the passengers' experience of the cabin environment. Summary of the Utility Model

[0004] In view of the above disadvantages of the prior art, the purpose of the present utility model is to provide a vehicle, which is used to solve the problem of large noise during the driving process of the vehicle in the prior art. First, collect the noise signal at the wheel, generate a noise reduction signal and play it inside the cabin, then repeat collecting the noise signal inside the cabin and input the two signals into the filter for processing at the same time to obtain the final noise reduction signal.

[0005] The present utility model provides an automobile noise reduction control device, including:

[0006] A microphone, which includes a reference microphone and an error microphone;

[0007] A central control module, which includes an adaptive filter and a processing module. The microphone is electrically connected to the central control module, and the processing module is electrically connected to the adaptive filter;

[0008] A speaker, which is electrically connected to the central control module;

[0009] Among them, the reference microphone and the error microphone respectively collect a reference noise signal and a cockpit noise signal from the wheel periphery and inside the vehicle cockpit and input them into the central control module.

[0010] In an embodiment of the present invention, the processing module generates a reference noise reduction signal according to the reference noise signal and inputs it into the speaker. The reference microphone inputs the reference noise signal as an input signal, and at the same time, the error microphone inputs the cockpit noise signal as an error signal into the adaptive filter.

[0011] In an embodiment of the present invention, the adaptive filter correspondingly outputs a cockpit noise reduction signal to the speaker, and the processing module updates the characteristic matrix of the adaptive filter in real time according to a preset algorithm.

[0012] In an embodiment of the present invention, it further includes a road surface memory module. The central control module further includes a comparison module. The road surface memory module is electrically connected to the speaker, the comparison module, and the processing module respectively.

[0013] In an embodiment of the present invention, the road surface memory module generates corresponding predicted noise signals and predicted noise reduction signals according to the input reference noise signal and the cockpit noise reduction signal.

[0014] In an embodiment of the present invention, the road surface memory module inputs the predicted noise signal into the comparison module to compare it with the reference noise signal. When the predicted noise signal is consistent with the reference noise signal, the predicted noise reduction signal corresponding to the predicted noise signal is directly output by the road surface memory module to the speaker. When the predicted noise signal is inconsistent with the reference noise signal, the cockpit noise reduction signal is normally calculated through the adaptive filter.

[0015] In an embodiment of the present invention, by analyzing the wavelength, tone color, and frequency information of the reference noise, the reference noise reduction that can cancel it is simulated, so as to correspondingly generate the reference noise reduction signal corresponding to the reference noise reduction.

[0016] In an embodiment of the present invention, the preset algorithm is the least mean square algorithm. The characteristic matrix of the adaptive filter includes the characteristic values of the cockpit noise signal. After the adaptive filter outputs the noise reduction signal to the speaker, the reference noise and the cockpit noise are repeatedly collected to generate the reference noise signal and the reference cockpit signal, and then the reference noise signal and the reference cockpit signal are input into the adaptive filter to generate the cockpit noise reduction signal and output it to the speaker to continuously adjust the cockpit noise reduction played by the speaker.

[0017] In an embodiment of the present utility model, the characteristic matrix of the adaptive filter is adjusted in real time according to the preset algorithm, and the adaptive filter outputs a continuous cockpit noise reduction signal to the speaker to continuously adjust the cockpit noise reduction sound emitted by the speaker corresponding to the cockpit noise reduction signal, so as to minimize the residual noise in the vehicle cockpit.

[0018] A vehicle includes the automotive noise reduction control device of any one of the above. A reference microphone is arranged near the wheel outside the vehicle, an error microphone is arranged on the top inside the vehicle, and speakers are evenly distributed inside the vehicle.

[0019] The present utility model provides a vehicle. First, the noise at the wheel is collected to generate a corresponding noise reduction signal and output to the speakers inside the vehicle. However, due to the influence of vehicle sound insulation and interference factors, secondary filtering is required. The cockpit noise signal collected inside the cockpit is used as the error signal, and the noise collected outside the vehicle is used as the input signal and output to the adaptive filter for processing. At the same time, the central control module adjusts the matrix of the filter in real time according to the preset algorithm to obtain the cockpit noise reduction signal. Meanwhile, a roadside memory module is also designed for assistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is the device architecture diagram of the control device of the present utility model;

[0022] Figure 2 It is the control principle diagram of the control device in an embodiment of the present utility model;

[0023] Figure 3 It is the schematic diagram showing the installation position of the display microphone in an embodiment of the present utility model;

[0024] Figure 4 It is the schematic diagram showing the installation position of the speakers in an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following specific examples illustrate the implementation modes of the present utility model. Those skilled in the art can easily understand the other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0026] It should be noted that the illustrations provided in the following embodiments only schematically illustrate the basic concept of the present utility model. Therefore, only the components related to the present utility model are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0027] In the following description, a large number of details are explored to provide a more thorough explanation of the embodiments of the present utility model. However, it is obvious to those skilled in the art that the embodiments of the present utility model can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present utility model difficult to understand.

[0028] When riding in a car, especially when the vehicle speed is relatively high, the noise inside the car is very high, mainly including tire noise, air vortex noise, etc. The strong noise is not conducive to passengers communicating with each other inside the car, and driving in a noisy environment for a long time is very likely to cause fatigue. The present utility model relates to the field of noise control, and particularly relates to an active noise reduction control device for pure electric vehicles. The noise reduction devices of general vehicles often achieve noise reduction by using methods such as improving sound insulation materials and adding sound insulation structures, which are often costly and complex to manufacture, and will greatly increase the manufacturing cost. In the present utility model, an automobile noise reduction control device is provided, which can eliminate noise by generating a noise reduction signal corresponding to the noise signal. At the same time, it also has a road surface memory function, which can significantly improve the noise reduction function and enhance the user's driving experience. The noise reduction control device provided by the present utility model will be specifically described below.

[0029] Please refer to Figures 1-4, shown is the automotive noise reduction control device of the present utility model. An automotive noise reduction control device of the present utility model includes a microphone, a central control module, and a speaker. The microphone includes a reference microphone and an error microphone; the central control module includes an adaptive filter and a processing module. The microphone is electrically connected to the central control module, and the processing module is electrically connected to the adaptive filter; the speaker is electrically connected to the central control module. Among them, the reference microphone and the error microphone respectively collect a reference noise signal and a cockpit noise signal from the periphery of the wheel and inside the vehicle cockpit and input them into the central control module. The processing module generates a reference noise reduction signal according to the reference noise signal and inputs it into the speaker. The reference microphone takes the reference noise signal as an input signal, and at the same time, the error microphone takes the cockpit noise signal as an error signal and inputs them both into the adaptive filter. The adaptive filter correspondingly outputs a cockpit noise reduction signal to the speaker, and the processing module updates the characteristic matrix of the adaptive filter in real time according to a preset algorithm.

[0030] As Figure 1 shown, is the architecture diagram of an automotive noise reduction control device provided by the present utility model. The automotive noise reduction control device of the present utility model includes a central control module, a microphone, and a speaker. The microphone includes a reference microphone and an error microphone; the central control module includes an adaptive filter and a processing module. The microphone is electrically connected to the processing module, and the processing module is electrically connected to the adaptive filter; the speaker is electrically connected to the processing module. Among them, the reference microphone and the error microphone respectively collect a reference noise signal and a cockpit noise signal and input them into the central control module. The processing module generates a reference noise reduction signal according to the reference noise signal and inputs it into the speaker. The reference noise reduction signal is used as an input signal, and at the same time, the cockpit noise signal is used as an error signal and input into the adaptive module and outputs a cockpit noise reduction signal to the speaker. The processing module updates the characteristic matrix of the adaptive filter in real time according to a preset algorithm. The present utility model further includes a road surface memory module, and the central control module further includes a comparison module. The road surface memory module is electrically connected to the speaker, the comparison module, and the processing module respectively. Among them, in an embodiment of the present utility model, the road surface memory module can also be included in the central control module. The road surface memory module generates corresponding predicted noise signals and predicted noise reduction signals according to the input reference noise signal and cockpit noise reduction signal. The road surface memory module inputs the predicted noise signal into the comparison module to compare it with the reference noise signal. When the predicted noise signal is consistent with the reference noise signal, the predicted noise reduction signal corresponding to the predicted noise signal is directly output from the road surface memory module to the speaker. When the predicted noise signal is inconsistent with the reference noise signal, the cockpit noise reduction signal is normally calculated through the adaptive filter.

[0031] Specifically, as Figure 2As shown, in one embodiment, the specific implementation of an automotive noise reduction device provided by the present utility model is as follows: A reference microphone is arranged around the wheel, and the reference microphone is used to collect reference noise; a reference noise reduction signal corresponding to the reference noise is generated, and a loudspeaker is arranged in the cockpit and the loudspeaker is used to emit the reference noise reduction signal for canceling the reference noise; an error microphone is arranged in the cockpit and the error microphone is used to collect the cockpit noise signal; the reference noise signal collected by the reference microphone is used as the input signal, and the cockpit noise signal collected by the error microphone is used as the error signal and transmitted to the adaptive filter. The characteristic matrix of the adaptive filter is updated according to the LMS algorithm (Least Mean Square algorithm) to continuously adjust the sound signal emitted by the loudspeaker to minimize the residual noise. Among them, the reference microphones are respectively located outside the vehicle near the front (rear) wheels. The reason for arranging the reference microphones near the wheels is that most of the noise perceived inside the vehicle comes from the tire noise generated by the rotation of the vehicle tires. The reference microphones near the wheels can collect the tire noise faster and more accurately, improving the noise reduction accuracy. In Figure 2 In the shown embodiment, an out-of-vehicle sensor is arranged on the front wheel arch, and at the same time, an out-of-vehicle sensor is arranged on the rear wheel arch. The noise signals near the vehicle wheels collected by them are all sent to the HW supercomputer CSC (i.e., the central control module). The noise collected by the reference microphone generates a corresponding reference noise signal and is output to the central control module (HW supercomputer CSC). The central control module includes a processing module, a comparison module, and an adaptive filter, and the reference noise signal is input to the processing module. After the reference noise signal enters the processing module, the processing module generates a reference noise reduction signal corresponding to it according to the reference noise signal. The timbre, frequency, and wavelength of the reference noise reduction generated after this reference noise reduction signal is played through the loudspeaker correspond to the reference noise. When the two meet, the reference noise reduction can cancel the reference noise, generating a relatively flat and comfortable sound. Therefore, the reference noise reduction signal generated by the processing is output to the in-vehicle loudspeaker, and the loudspeaker generates a reference noise reduction corresponding to the reference noise reduction signal to cancel the noise. However, in fact, the reference noise reduction signal generated by the reference noise signal cannot completely cancel the influence brought by the reference noise because factors such as vehicle sound insulation, noise attenuation during driving, and other noises need to be considered. Therefore, further processing needs to be performed on the reference noise signal.

[0032] Furthermore, it is necessary to collect the cockpit noise signal through the error microphone (in-vehicle residual noise sensor) inside the vehicle. At this time, the cockpit noise signal is the noise signal generated after the cancellation of the external vehicle noise and the reference noise reduction. This kind of noise signal contains the change situation after the external vehicle signal is transmitted into the vehicle. According to this change, the noise reduction signal that can actually cancel the external vehicle noise can be calculated. Therefore, when the adaptive filter performs filtering processing, the cockpit noise signal collected by the error microphone inside the vehicle is output to the adaptive filter as the error signal, and the collected reference noise signal is output to the adaptive filter as the input signal. Then, the reference noise reduction signal that can cancel the external vehicle noise can be obtained through the adaptive filter. The adaptive filter is connected to the processor, and the processor updates the characteristic matrix of the adaptive filter in real time according to the preset LMS algorithm to continuously adjust the output cockpit noise reduction signal. The cockpit noise reduction signal is output from the adaptive filter to the speaker, and the speaker generates the noise reduction and cancels the external vehicle noise.

[0033] The processing process of the road surface memory module (SW road surface memory) is also included in the vehicle noise reduction control device of the present utility model. When the vehicle is driving normally, it may encounter the situation of driving on the same road condition for a long time, or the situation of uniform acceleration and deceleration. It is necessary to spend a certain amount of time to reach the optimal noise reduction working condition, but the noise reduction process in the middle may affect the driving experience of the user. Therefore, a road surface memory module is also included. The road surface memory module is electrically connected to the speaker, the processing module and the comparison module. The road surface memory module continuously collects the reference noise and generates a predicted noise signal. Then, the road surface memory module continuously collects the cockpit noise reduction signal and generates a corresponding predicted noise reduction signal. When the predicted noise signal is consistent with the reference noise signal, the predicted noise signal corresponding to the reference noise signal is directly output to the speaker. The advantage of doing this is that the corresponding noise reduction signal can be directly output according to the noise signal. Skipping the intermediate processing steps can quickly face various noise environments and achieve the effect of rapid noise reduction.

[0034] As Figure 3 , 4 shown, a vehicle provided in an embodiment of the present utility model is shown. The vehicle includes the above-mentioned vehicle noise reduction control device, wherein the reference microphone 10 is arranged near the wheel outside the vehicle, the error microphone 20 is arranged on the top inside the vehicle, and the speakers are evenly distributed inside the vehicle. Among them, MID represents the speaker arranged in the middle of the vehicle, TW represents the speaker arranged on the top wall of the vehicle, HR represents the speaker used to divide the sound transmission block, WF represents the speaker used for the workflow, and SUB is the auxiliary speaker.

[0035] The present utility model provides an automobile noise reduction control device, which first collects the noise at the wheels to generate a corresponding noise reduction signal and outputs it to the speakers in the vehicle. However, due to the influence of vehicle sound insulation and interference factors, secondary filtering is required. The cabin noise signal collected in the cabin is used as the error signal, and the noise collected outside the vehicle is used as the input signal and output to an adaptive filter for processing. At the same time, the central control module adjusts the matrix of the filter in real time according to a preset algorithm to obtain the cabin noise reduction signal. Meanwhile, a roadside memory module is also designed for assistance.

[0036] Therefore, the automobile noise reduction control device provided by the present utility model can solve the problem of large noise during the driving of vehicles in the prior art.

[0037] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not used to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A vehicle, characterized in that, Comprising: A microphone, the microphone including a reference microphone and an error microphone, the reference microphone being disposed outside the vehicle near a wheel, and the error microphone being disposed inside the vehicle; A central control module, the central control module including an adaptive filter and a processing module, the microphone being electrically connected to the central control module, and the processing module being electrically connected to the adaptive filter; Speakers, the speakers being evenly distributed inside the vehicle, the speakers being electrically connected to the central control module; Wherein, the reference microphone is used to collect a reference noise signal from the periphery of the vehicle's wheels, and the error microphone is used to collect a cabin noise signal from inside the vehicle's cabin.

2. The vehicle according to claim 1, characterized in that, The processing module generates a reference noise reduction signal according to the reference noise signal and outputs it to the speakers, the reference microphone inputs the reference noise signal as an input signal, and at the same time the error microphone inputs the cabin noise signal as an error signal into the adaptive filter.

3. The vehicle according to claim 2, characterized in that, The adaptive filter correspondingly outputs a cabin noise reduction signal to the speakers, and the processing module updates the characteristic matrix of the adaptive filter in real time according to a preset algorithm.

4. The vehicle according to claim 3, characterized in that, It further includes a road surface memory module, and the central control module further includes a comparison module, the road surface memory module being electrically connected to the speakers, the comparison module and the processing module respectively.

5. The vehicle according to claim 4, characterized in that, The road surface memory module generates corresponding predicted noise signals and predicted noise reduction signals according to the input reference noise signal and the cabin noise reduction signal.

6. The vehicle according to claim 5, characterized in that, The road surface memory module inputs the predicted noise signal into the comparison module for comparison with the reference noise signal. When the predicted noise signal is consistent with the reference noise signal, the predicted noise reduction signal corresponding to the predicted noise signal is directly output by the road surface memory module to the speakers. When the predicted noise signal is inconsistent with the reference noise signal, the cabin noise reduction signal is normally calculated through the adaptive filter.

7. The vehicle according to claim 2, wherein By analyzing the wavelength, timbre and frequency information of the reference noise, a reference noise reduction that can cancel it is simulated, so as to correspondingly generate the reference noise reduction signal corresponding to the reference noise reduction.

8. The vehicle according to claim 3, characterized in that, The preset algorithm is the least mean square algorithm. The characteristic matrix of the adaptive filter includes the eigenvalues of the cabin noise signal. After the adaptive filter outputs a noise reduction signal to the speakers, the reference noise and the cabin noise are repeatedly collected and the reference noise signal and the reference cabin signal are generated, and then the reference noise signal and the reference cabin signal are input into the adaptive filter to generate the cabin noise reduction signal and output it to the speakers to continuously adjust the cabin noise reduction played by the speakers.

9. The vehicle according to claim 8, characterized in that, The characteristic matrix of the adaptive filter is adjusted in real time according to the preset algorithm, and the adaptive filter outputs a continuous cabin noise reduction signal to continuously adjust the cabin noise reduction corresponding to the cabin noise reduction signal emitted by the speakers, so as to minimize the residual noise in the vehicle cabin.

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