Air conditioner noise reduction system and method, product and vehicle

Abstract

The invention provides an air conditioner noise reduction system and method, a product and a vehicle, and belongs to the technical field of vehicle noise reduction. The air conditioner noise reduction system comprises an air port noise collection module used for collecting original noise signals of an air conditioner air duct of a vehicle; the cabin noise acquisition module is used for acquiring cabin noise signals in the vehicle cabin; the noise reduction processing module is used for executing a target noise reduction strategy corresponding to the current driving information for noise reduction according to the current driving information of the vehicle; the target noise reduction strategy is a first noise reduction strategy used for performing noise reduction according to the original noise signal or a second noise reduction strategy used for performing noise reduction according to the original noise signal and the cabin noise signal. The invention aims to improve the noise reduction effect.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of vehicle noise reduction. Specifically, the present application relates to an air conditioner noise reduction system, method, product, and vehicle. Background Art

[0002] With the rapid development of automobiles, in order to improve the comfort of users when using vehicles, vehicle noise reduction technology has become increasingly mature. When the air conditioner system of a vehicle is operating, some noises are inevitable. Currently, common air conditioner system noise reduction methods include active air conditioner noise reduction methods, and common ones are pipeline noise reduction methods.

[0003] However, pipeline noise reduction cannot effectively solve the noise after the air outlet of the air conditioner system. When road noise or wind noise is relatively obvious, the overall noise reduction effect is weak. Summary of the Invention

[0004] The embodiments of the present application provide an air conditioner noise reduction system, method, product, and vehicle, aiming to improve the noise reduction effect.

[0005] In a first aspect, the embodiments of the present application provide an air conditioner noise reduction system, and the system includes: An air outlet noise acquisition module, configured to acquire an original noise signal of the air conditioner duct of the vehicle; A cockpit noise acquisition module, configured to acquire a cockpit noise signal inside the vehicle cockpit; A noise reduction processing module, configured to perform noise reduction according to a target noise reduction strategy corresponding to the current driving information of the vehicle; wherein the target noise reduction strategy is a first noise reduction strategy for performing noise reduction according to the original noise signal, or a second noise reduction strategy for performing noise reduction according to the original noise signal and the cockpit noise signal.

[0006] Optionally, the first noise reduction strategy is a fixed filter noise reduction strategy, and / or the second noise reduction strategy is an adaptive filter noise reduction strategy.

[0007] Optionally, the driving information includes vehicle speed; When the current vehicle speed of the vehicle indicates that the vehicle is in a stationary state, the target noise reduction strategy is the first noise reduction strategy.

[0008] Optionally, the first noise reduction strategy includes: the noise reduction processing module emits a first anti-phase noise reduction wave with the same frequency and opposite phase as the original noise signal according to the original noise signal acquired by the air outlet noise acquisition module, so as to perform noise reduction through sound field superposition.

[0009] Optionally, the noise reduction processing module includes a processing unit and a speaker unit; The processing unit is used to generate the first inverted noise reduction wave; The speaker unit is used to emit the first inverted noise reduction wave.

[0010] Optionally, the driving information includes vehicle speed; When the current vehicle speed of the vehicle indicates that the vehicle is in a driving state, the current vehicle speed is less than the first vehicle speed, and the cockpit noise signal meets the adaptive noise reduction condition, the target noise reduction strategy is the second noise reduction strategy, and the first vehicle speed is the critical vehicle speed at which the main noise in the vehicle is non-air-conditioning noise or air-conditioning noise.

[0011] Optionally, when the difference between the average sound pressure value of the low-frequency noise and the average sound pressure value of the high-frequency noise in the cockpit noise signal is less than or equal to the target value, the cockpit noise signal meets the adaptive noise reduction condition, the low-frequency noise is non-air-conditioning noise, and the high-frequency noise is air-conditioning noise.

[0012] Optionally, the low-frequency noise is noise in the range of 30 - 350 Hz; and / or, the high-frequency noise is noise in the range of 350 - 1000 Hz.

[0013] Optionally, the target value is 10 Db.

[0014] Optionally, the second noise reduction strategy includes: the noise reduction processing module uses the original noise signal as a reference signal, uses the cockpit noise signal collected in real time by the cockpit noise collection module as an error signal, executes an adaptive filtering algorithm, and emits a second inverted noise reduction wave to perform noise reduction through sound field superposition.

[0015] Optionally, the noise reduction processing module includes a processing unit and a speaker unit; The processing unit is used to generate the second inverted noise reduction wave; The speaker unit is used to emit the second inverted noise reduction wave.

[0016] Optionally, the adaptive filtering algorithm includes the RLS algorithm, the LMS algorithm, and the FxLMS algorithm.

[0017] Optionally, the driving information includes vehicle speed; when the current vehicle speed of the vehicle indicates that the vehicle is in a driving state and the current vehicle speed is greater than or equal to the first vehicle speed, the noise reduction processing module is used to stop the noise reduction process.

[0018] Optionally, the first vehicle speed is 80 km / h.

[0019] Optionally, the noise reduction processing module is used to execute the target noise reduction strategy corresponding to the current driving information for noise reduction when the original noise signal meets the noise reduction execution condition.

[0020] Optionally, when the original noise signal does not meet the noise reduction execution condition, the noise reduction processing module is configured to stop the noise reduction process and send an air conditioner fault warning signal to the vehicle head unit.

[0021] Optionally, when the original noise signal is less than or equal to a preset fault noise threshold, the original noise signal meets the noise reduction execution condition.

[0022] Optionally, the air outlet noise acquisition module is disposed on the side wall of the duct of the air outlet of the vehicle air conditioner; The air outlet of the vehicle air conditioner includes a foot air outlet, a face air outlet, and a defogging air outlet.

[0023] Optionally, the air outlet noise acquisition module includes a MEMS microphone.

[0024] Optionally, the noise reduction processing module includes a speaker unit, and the speaker unit is disposed on the side wall of the duct of the air outlet of the vehicle air conditioner.

[0025] Optionally, the speaker unit includes a dynamic coil speaker, a balanced armature speaker, an electrostatic speaker, and a planar diaphragm speaker.

[0026] Optionally, the cabin noise acquisition module is disposed in each seat headrest of the vehicle.

[0027] Optionally, the cabin noise acquisition module is disposed on the roof of the vehicle above each seat.

[0028] Optionally, the cabin noise acquisition module includes a MEMS microphone.

[0029] In a second aspect, an embodiment of the present application provides an air conditioner noise reduction method, and the method includes: Performing noise reduction according to a target noise reduction strategy corresponding to the current driving information of the vehicle, where the target noise reduction strategy includes a first noise reduction strategy or a second noise reduction strategy; When the target noise reduction strategy is the first noise reduction strategy, performing noise reduction according to the original noise signal of the vehicle air conditioner duct collected; When the target noise reduction strategy is the second noise reduction strategy, performing noise reduction according to the original noise signal and the cabin noise signal in the cabin of the vehicle collected.

[0030] Optionally, when the current vehicle speed indicates that the vehicle is in a stationary state, the target noise reduction strategy is the first noise reduction strategy.

[0031] Optionally, the first noise reduction strategy includes: Generate and emit a first inverted noise reduction wave that has the same frequency as and is out of phase with the original noise signal to reduce noise through sound field superposition based on the original noise signal.

[0032] Optionally, when the current vehicle speed of the vehicle indicates that the vehicle is in a driving state and the current vehicle speed is less than the first vehicle speed, if the cockpit noise signal meets the adaptive noise reduction condition, the target noise reduction strategy is the second noise reduction strategy.

[0033] Optionally, when the difference between the average sound pressure value of the low-frequency noise and the average sound pressure value of the high-frequency noise of the cockpit noise signal is less than or equal to the target value, the cockpit noise signal meets the adaptive noise reduction condition.

[0034] Optionally, the second noise reduction strategy includes: Taking the original noise signal as the reference signal, taking the cockpit noise signal collected in real time by the cockpit noise acquisition module as the error signal, performing an adaptive filtering algorithm, generating and emitting a second inverted noise reduction wave to reduce noise through sound field superposition.

[0035] Optionally, the method further includes: When the original noise signal is greater than a preset fault noise threshold, stop the noise reduction process and send an air conditioner fault warning signal to the vehicle's in-vehicle computer.

[0036] In a third aspect, an embodiment of the present application provides an electronic device, including: at least one processor, and a memory, where the memory stores a computer program that can run on the processor, and wherein when the processor executes the computer program, it executes the air conditioner noise reduction method described in the second aspect of the embodiment.

[0037] In a fourth aspect, an embodiment of the present application provides a non-volatile readable storage medium that stores a computer program, and wherein when the computer program is executed by a processor, it executes the air conditioner noise reduction method described in the second aspect of the embodiment.

[0038] In a fifth aspect, an embodiment of the present application provides a computer program product, including computer program / instructions, and when the computer program / instructions are executed by a processor, they implement the air conditioner noise reduction method described in the second aspect of the embodiment.

[0039] In a sixth aspect, an embodiment of the present application provides a vehicle, on which the air conditioner noise reduction system described in the first aspect of the embodiment is provided, or is used to execute the air conditioner noise reduction method described in the second aspect of the embodiment.

[0040] Advantageous effects: The system is provided with a tuyere noise acquisition module in the air-conditioning duct of the vehicle, which can collect the original noise signal at the air-conditioning duct, and a cockpit noise acquisition module is arranged in the vehicle cockpit, which can collect the cockpit noise signal in the cockpit.

[0041] Under different driving information of the vehicle, the noise sources in the vehicle are also different. During the noise reduction process, according to the driving information of the vehicle, it is determined whether the target noise reduction strategy corresponding to the current driving information is the first noise reduction strategy for noise reduction based on the original noise signal or the second noise reduction strategy for noise reduction based on the original noise signal and the cockpit noise signal. Thus, it is possible to adaptively adjust the target noise reduction strategy for noise reduction according to the driving information of the vehicle, improving the noise reduction effect of the vehicle under the current vehicle condition. Description of the Drawings

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0043] Figure 1 It is a functional module diagram of an air-conditioning noise reduction system proposed in an embodiment of the present application; Figure 2 It is a functional module diagram of an air-conditioning noise reduction system proposed in an embodiment of the present application; Figure 3 It is a noise reduction schematic diagram of the first noise reduction strategy provided in an embodiment of the present application; Figure 4 It is a noise reduction schematic diagram of the second noise reduction strategy proposed in an embodiment of the present application; Figure 5 It is a step flowchart of an air-conditioning noise reduction method proposed in an embodiment of the present application; Figure 6 It is an execution flowchart of an air-conditioning noise reduction method provided in an embodiment of the present application; Figure 7 It is a schematic diagram of an electronic device proposed in an embodiment of the present application; Figure 8 It is a schematic diagram of a non-volatile readable storage medium provided in an embodiment of the present application; Figure 9 It is a schematic diagram of a computer program product proposed in an embodiment of the present application. Detailed Embodiments

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0045] With the rapid development of the automotive industry, in order to improve the comfort of users when using vehicles, vehicle noise reduction technology has become increasingly mature. When the air conditioning system of a vehicle is operating, some noises are inevitable. Currently, common air conditioning system noise reduction methods include passive air conditioning noise reduction and active air conditioning noise reduction.

[0046] In passive air conditioning noise reduction, special sound insulation materials and equipment are mostly used, such as sound insulation foam boards, noise reduction blankets, mufflers or sound insulation covers, etc. However, the cost of these sound insulation and noise reduction materials is relatively high, increasing the cost input of the entire vehicle. At the same time, passive noise reduction measures may affect the ventilation and heat dissipation effects of the air conditioner, thereby affecting the working efficiency and lifespan of the air conditioner. Moreover, passive noise reduction equipment requires regular maintenance and replacement, increasing the later maintenance cost.

[0047] In active air conditioning noise reduction, common methods include duct noise reduction and adaptive noise reduction. However, the duct noise reduction method reduces noise based on the sound in the air outlet duct of the air conditioner and cannot effectively solve the noise after the air outlet of the air conditioning system. For example, it is difficult to accurately predict the noise at the human ear, and the adaptability and adjustability are also relatively poor, unable to adapt to the acoustic transmission characteristic differences caused by vehicle aging, resulting in a decline in the noise reduction effect.

[0048] In the adaptive noise reduction method, although residual noise microphones are arranged not only near the air conditioner but also near the human ear, it will result in a relatively high overall cost of the noise reduction system and a relatively high computing power requirement. When the vehicle is in a general stationary state, there is a lack of masking effect, so the air conditioning noise will be relatively prominent. Due to the statistical stationary characteristic of the air conditioning noise, the benefits of the adaptive system are not significant.

[0049] For the current active air conditioning noise reduction methods, when the road noise or wind noise of the vehicle is relatively obvious, there is a problem that turning on the air conditioning noise reduction has no significant noise reduction effect, and the overall noise reduction effect is weak.

[0050] Therefore, the embodiments of the present application provide an air conditioning noise reduction system, which can improve the noise reduction effect and optimize the user's riding experience.

[0051] Refer to Figure 1, which shows a functional module diagram of an air conditioner noise reduction system in an embodiment of the present application. The air conditioner noise reduction system includes an air outlet noise acquisition module, a cabin noise acquisition module, and a noise reduction processing module. The air outlet noise acquisition module and the cabin noise acquisition module are both connected to the noise reduction processing module.

[0052] Specifically, the air outlet noise acquisition module is used to acquire the original noise signal of the vehicle's air conditioning duct, and the original noise signal mainly represents the air conditioner noise of the vehicle.

[0053] Exemplarily, the air outlet noise acquisition module can be arranged on the side wall of the pipeline at the air outlet of the vehicle's air conditioning duct. The air outlet of the air conditioning duct includes a foot blowing outlet, a face blowing outlet, a defogging outlet, etc. In the actual implementation process, the installation position of the air outlet noise acquisition module can be selected according to actual application requirements.

[0054] The air outlet noise acquisition module can include a MEMS microphone. In addition to using a MEMS microphone with a relatively small volume, in the actual implementation process, other microphones that can collect sound signals can also be used. This embodiment does not limit the type and quantity of the microphones for collecting noise.

[0055] The installation methods of the air outlet noise acquisition module include but are not limited to plate hole snap connection, clip embedding, and integration, etc. The installation method can be selected according to actual application requirements.

[0056] The cabin noise acquisition module is used to acquire the cabin noise signal inside the vehicle cabin, mainly for acquiring the noise near the human ear inside the vehicle.

[0057] Exemplarily, the cabin noise acquisition module can be arranged in each seat headrest of the vehicle, or on the roof above each seat of the vehicle.

[0058] The cabin noise acquisition module can also include a MEMS microphone. In addition to using a MEMS microphone with a relatively small volume, in the actual implementation process, other microphones that can collect sound signals can also be used. This embodiment does not limit the type and quantity of the microphones for collecting noise.

[0059] And in the actual implementation process, in addition to arranging a physical microphone unit in the seat headrest or on the roof above the seat of the vehicle as the cabin noise acquisition module, the virtual microphone algorithm can also be used to assist in obtaining a more accurate cabin noise signal on the user's ear side inside the vehicle cabin.

[0060] Since a microphone cannot be placed near the human eardrum, it is impossible to achieve sufficient noise reduction for the sounds heard by the human ear. In a virtual microphone algorithm, by measuring the system model from a physical microphone to a virtual microphone, a more accurate and better noise reduction effect can be achieved at the desired human ear position; when using the virtual microphone algorithm to assist in obtaining the noise at the human ear, the position of the microphone can be flexibly set in the virtual space as needed, without being limited by the environment. To a certain extent, this can reduce the need for additional hardware, lower the device cost and system complexity, and not increase excessive hardware costs.

[0061] The noise reduction processing module is configured to perform noise reduction according to the current driving information of the vehicle by executing a target noise reduction strategy corresponding to the current driving information. The target noise reduction strategy is a first noise reduction strategy for noise reduction according to the original noise signal, or a second noise reduction strategy for noise reduction according to the original noise signal and the cockpit noise signal.

[0062] In the actual implementation process, the first noise reduction strategy is a fixed filter noise reduction strategy, and / or the second noise reduction strategy is an adaptive filter noise reduction strategy.

[0063] Specifically, the current driving information of the vehicle includes the vehicle speed. When the vehicle turns on the air conditioner, at different driving speeds, the sources of noise inside the vehicle are also different. For example: When the vehicle is in a stationary state, the main noise inside the vehicle is the air conditioner noise.

[0064] When the vehicle is driving at a relatively low speed, the noise inside the vehicle includes air conditioner noise and non-air conditioner noise. The non-air conditioner noise includes environmental noises such as road noise, wind noise, engine noise, and tire noise.

[0065] When the vehicle is driving at a relatively high speed, the main noise inside the vehicle is mainly non-air conditioner noise.

[0066] Therefore, the noise reduction processing module can determine the target noise reduction strategy to be executed according to the current vehicle speed.

[0067] In a feasible implementation manner, when the current vehicle speed of the vehicle indicates that the vehicle is in a stationary state, the target noise reduction strategy is the first noise reduction strategy.

[0068] The first noise reduction strategy includes: the noise reduction processing module emits a first anti-phase noise reduction wave with the same frequency and opposite phase as the original noise signal collected by the air outlet noise acquisition module to perform noise reduction through sound field superposition.

[0069] When the vehicle's air conditioner is turned on and the vehicle's current speed is 0, that is, when the vehicle is in a stationary state, the main noise inside the vehicle is the air conditioner noise. At this time, the first noise reduction strategy based on the original noise signal of the air conditioner duct can be executed. Thus, for the original noise signal of the air conditioner duct, the first anti-phase noise reduction wave with the same frequency and opposite phase as the original noise signal can be generated and emitted. Through sound field superposition, the air conditioner noise can be more accurately reduced, enhancing the noise reduction effect.

[0070] When the vehicle's current speed indicates that the vehicle is in a driving state, it is necessary to determine whether the main noise inside the vehicle is air conditioner noise or non-air conditioner noise.

[0071] Specifically, by judging the magnitude relationship between the vehicle's current speed and the first speed, it can be preliminarily determined whether the main noise inside the vehicle is air conditioner noise or non-air conditioner noise.

[0072] The first speed is the critical speed at which the main noise in the vehicle is non-air conditioner noise or air conditioner noise. For example, the first speed can be set to 80 km / h. In the actual implementation process, the magnitude of the first speed can also be set according to the actual application requirements, which is not limited in this embodiment.

[0073] When the current speed is greater than or equal to the first speed, it indicates that the main noise inside the vehicle is already non-air conditioner noise. At this time, even if the noise reduction process is executed, its noise reduction effect is limited. Therefore, the noise reduction process can be stopped to save the vehicle's energy consumption, and it can continue to monitor in real time whether the current speed is less than the first speed.

[0074] When the current speed is less than the first speed, the noise inside the vehicle at this time includes not only the air conditioner noise but also non-air conditioner noises, such as road noise, wind noise, engine noise, and tire noise and other environmental noises. It is necessary to further determine whether the main noise inside the vehicle is air conditioner noise or non-air conditioner noise.

[0075] If the main noise inside the vehicle is still the air conditioner noise at this time, but due to the influence of non-air conditioner noise, the air outlet noise acquisition module of the vehicle's air conditioner duct will be affected by the dynamic noise, that is, non-air conditioner noise. According to the first noise reduction strategy based on the original noise signal in the air conditioner duct, the noise at the human ear cannot be accurately predicted, and only the broadband noise of the air conditioner is processed. Moreover, limited by the size of the air conditioner duct, the size of the microphone, and the assembly difficulty, the number of microphones set at the air outlet of the air conditioner duct is also limited, increasing the difficulty of the air outlet noise acquisition module in capturing the complex noise sound field.

[0076] Moreover, at this time, the first noise reduction strategy has poor adaptability to noise changes. It not only fails to comprehensively and accurately capture the noise in the surrounding environment, but also the noise reduction effect of the first noise reduction strategy will be significantly weakened in some areas or at specific frequencies. Especially for high-frequency or strongly directional noise, it may not be able to effectively perform noise reduction processing. Therefore, at this time, the second noise reduction strategy can be executed, combining the original noise data of the air-conditioning duct and the cockpit noise signal in the vehicle cockpit for noise reduction.

[0077] If the main noise in the vehicle at this time is non-air-conditioning noise, the effect of air-conditioning noise reduction is not obvious at this time, and the noise reduction process can be stopped.

[0078] Specifically, when the current vehicle speed is less than the first vehicle speed, it can be determined whether the main noise in the vehicle is air-conditioning noise or non-air-conditioning noise by judging that the cockpit noise signal meets the adaptive noise reduction condition.

[0079] First, by performing spectral analysis on the cockpit noise signal, the low-frequency noise and high-frequency noise in the cockpit noise signal can be determined. The low-frequency noise is non-air-conditioning noise, and the high-frequency noise is air-conditioning noise.

[0080] Then, the average sound pressure value of the low-frequency noise and the average sound pressure value of the high-frequency noise of the cockpit noise signal can be determined respectively. According to the difference between the average sound pressure value of the low-frequency noise and the average sound pressure value of the high-frequency noise and the target value, it can be determined whether the cockpit noise signal meets the adaptive noise reduction condition.

[0081] Specifically, when the difference between the average sound pressure value of the low-frequency noise and the average sound pressure value of the high-frequency noise of the cockpit noise signal is less than or equal to the target value, the cockpit noise signal meets the adaptive noise reduction condition, indicating that the main noise in the vehicle is air-conditioning noise.

[0082] When the difference between the average sound pressure value of the low-frequency noise and the average sound pressure value of the high-frequency noise of the cockpit noise signal is greater than the target value, the cockpit noise signal does not meet the adaptive noise reduction condition, indicating that the main noise in the vehicle is non-air-conditioning noise.

[0083] In the actual implementation process, the low-frequency noise can be noise in the range of 30 - 350 Hz; and / or, the high-frequency noise can be noise in the range of 350 - 1000 Hz, and the target value can be set to 10 Db. The low-frequency and high-frequency noise ranges and the target value can also be set according to the actual application requirements.

[0084] The second noise reduction strategy includes: the noise reduction processing module uses the original noise signal as the reference signal, and the cockpit noise signal collected in real time by the cockpit noise collection module as the error signal, executes the adaptive filtering algorithm, and emits the second anti-phase noise reduction wave to perform noise reduction through sound field superposition.

[0085] Exemplarily, the adaptive filtering algorithm includes the RLS algorithm, the LMS algorithm, and the FxLMS algorithm. During the actual implementation process, other adaptive filtering algorithms can also be used, and this embodiment does not make any restrictions.

[0086] In the second noise reduction strategy, according to the cockpit noise signal obtained by the cockpit noise acquisition module, the anti-phase noise reduction wave determined based on the original noise signal of the air conditioner can be calibrated, so as to more accurately detect the noise actually received by the human ear, and perform real-time feedback and adjustment, thereby more effectively reducing the residual noise of the air conditioner at the human ear in a complex noise environment.

[0087] When the current vehicle speed of the vehicle indicates that the vehicle is in a driving state, but the current vehicle speed is greater than or equal to the first vehicle speed, at this time the main noise inside the vehicle is non-air conditioner noise. Continuing to execute the noise reduction strategy will also result in a weak noise reduction effect. Therefore, the noise reduction processing module can stop the noise reduction process.

[0088] In a feasible implementation manner, the noise reduction processing module is further configured to determine whether there is a fault in the vehicle's air conditioner. When there is no fault in the air conditioner, the target noise reduction strategy can be executed according to the current driving information. When there is a fault in the air conditioner, the noise reduction process can be stopped.

[0089] Specifically, it can be determined whether there is a fault in the vehicle's air conditioner by judging whether the original noise signal meets the noise reduction execution condition.

[0090] Exemplarily, when the original noise signal is less than or equal to the preset fault noise threshold, the original noise signal meets the noise reduction execution condition. At this time, there is no fault in the air conditioner, and the noise reduction processing module is configured to execute the target noise reduction strategy corresponding to the current driving information for noise reduction.

[0091] When the original noise signal is greater than the preset fault noise threshold, the original noise signal does not meet the noise reduction execution condition. At this time, there is a fault in the air conditioner, and the noise reduction processing module is configured to stop the noise reduction process and send an air conditioner fault warning signal to the vehicle's on-board computer. The on-board computer can prompt the user of the current air conditioner fault according to the air conditioner fault warning signal to prompt the user to repair the air conditioner in time.

[0092] The preset fault noise threshold can be set through pre-calibration. During the calibration process, the noise decibel value range of the vehicle's air conditioner operating normally in different modes or gears is obtained, and a fault noise threshold is set according to the maximum noise decibel value of the air conditioner obtained by calibration. Exemplarily, the sum of the maximum noise decibel value and the redundant noise decibel value is used as the fault noise threshold, and the size of the redundant noise decibel value can be selected according to the actual application requirements.

[0093] By setting a fault noise threshold and comparing the current original noise signal with the fault noise threshold in real time, it is possible to more intuitively diagnose whether the vehicle's air conditioner is faulty, avoid the impact of air conditioner faults on the air conditioner noise reduction system, reduce the divergence risk of the air conditioner noise reduction system, and improve the stability of the air conditioner noise reduction system.

[0094] In the actual implementation process, in addition to judging whether the air conditioner is faulty based on noise, the noise reduction processing module can also judge whether the vehicle's air conditioner is faulty by obtaining the air conditioner parameters of the vehicle, such as the refrigeration system pressure coefficient, temperature parameters, and air volume parameters, etc. When the air conditioner fails, the current noise reduction process is stopped.

[0095] Refer to Figure 2 , which shows a functional module diagram of an air conditioner noise reduction system in an embodiment of the present application. The noise reduction processing module may further include a processing unit and a speaker unit. The processing unit is respectively connected to the air outlet noise collection module, the cockpit noise collection module, and the speaker unit. The processing unit can supply power to the air outlet noise collection module, the cockpit noise collection module, and the speaker unit, or the processing unit can control the enabling or disabling of the air outlet noise collection module, the cockpit noise collection module, and the speaker unit.

[0096] The processing unit is used to obtain various information of the vehicle, such as obtaining the air conditioner status information and driving information of the vehicle on the vehicle head unit through the vehicle's vehicle CAN system.

[0097] Exemplarily, when the processing unit obtains that the current air conditioner status information of the vehicle is in the on state, the processing unit can send an enabling control signal to the air outlet noise collection module and the speaker unit, and is ready to enter the noise reduction process. After the air outlet noise collection module is enabled, it can collect the original noise signal of the air conditioner duct and send the original noise signal to the processing unit.

[0098] When the current air conditioner status information of the vehicle is in the off state, the processing unit can control the disabling of the air outlet noise collection module and the speaker unit, so that when the air conditioner is turned off, the energy consumption can be reduced and the service life of the noise reduction device can be extended.

[0099] In order to further save energy consumption, the processing unit can control the disabling of the cockpit noise collection module when the vehicle is in a stationary state, and enable the cockpit noise collection module to collect the cockpit noise signal on the user's ear side in the vehicle cockpit when the vehicle is in a driving state and the current vehicle speed is less than the first vehicle speed.

[0100] When the vehicle is in a driving state and the current vehicle speed is greater than or equal to the first vehicle speed, the noise reduction process is stopped. At this time, the processing unit can also control the air outlet noise acquisition module, the cockpit noise acquisition module, and the speaker unit to close.

[0101] During the noise reduction process, the processing unit is used to execute a corresponding target noise reduction strategy according to the current driving information of the vehicle, and generate the first anti-phase noise reduction wave or the second anti-phase noise reduction wave; the speaker unit is used to emit the first anti-phase noise reduction wave or the second anti-phase noise reduction wave.

[0102] Refer to Figure 3 , which shows the noise reduction schematic diagram of the first noise reduction strategy provided by the embodiment of the present application. The air outlet noise acquisition module sends the collected original noise signal to the processing unit, and the processing unit generates a first anti-phase noise reduction wave with the same frequency and opposite phase as the original noise signal according to the original noise signal.

[0103] The speaker unit is used as a secondary sound source. The processing unit can send a first secondary sound source signal to the speaker unit, and the first secondary sound source signal is used to control the speaker unit to emit the first anti-phase noise reduction wave for noise reduction through sound field superposition.

[0104] Refer to Figure 4 , which shows the noise reduction schematic diagram of the second noise reduction strategy provided by the embodiment of the present application. The air outlet noise acquisition module sends the collected original noise signal to the processing unit, and the cockpit noise acquisition module sends the collected cockpit noise signal to the processing unit.

[0105] The processing unit is used to use the original noise signal as a reference signal, use the cockpit noise signal collected in real time by the cockpit noise acquisition module as an error signal, execute an adaptive filtering algorithm, and generate the second anti-phase noise reduction wave.

[0106] Exemplarily, the adaptive filtering algorithm may include the RLS algorithm, the LMS algorithm, and the FxLMS algorithm. In the actual application process, other adaptive filtering algorithms may also be used, which are not limited in this embodiment.

[0107] Taking the FxLMS algorithm as an example, based on the cockpit noise signal as an error signal, the weights of the adaptive filter in the FxLMS algorithm can be updated, and the finally output second anti-phase noise reduction wave can be corrected through the feedback of the error signal.

[0108] The speaker unit is used as a secondary sound source. The processing unit can send a second secondary sound source signal to the speaker unit, and the second secondary sound source signal is used to control the speaker unit to emit the second anti-phase noise reduction wave for noise reduction through sound field superposition.

[0109] By calibrating the anti-phase noise reduction wave determined according to the original noise signal of the air conditioner based on the cockpit noise signal obtained by the cockpit noise acquisition module, the noise actually received by the human ear can be detected more accurately, and real-time feedback and adjustment can be performed, so as to more effectively reduce the residual noise of the air conditioner at the human ear in a complex noise environment.

[0110] In the actual implementation process, the processing unit may include one or more processing cores, such as a 4-core processor or an 8-core processor, etc. The processing unit can be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field Programmable Gate Array), and PLA (Programmable Logic Array), and this embodiment does not make any restrictions.

[0111] The speaker unit can also be arranged on the side wall of the duct of the air outlet of the vehicle's air conditioner duct. The speaker unit and the air outlet noise acquisition module can be arranged on the side wall of the air outlet duct of the air conditioner duct in a uniform arrangement or other ways. However, when arranging the speaker unit and the air outlet noise acquisition module, it is necessary to avoid mutual influence between the two, and avoid closed-loop oscillation and howling caused by too close distance.

[0112] In the actual implementation process, the speaker unit includes, but is not limited to, dynamic loudspeakers, moving iron loudspeakers, electrostatic loudspeakers, and planar diaphragm loudspeakers. The type and quantity of the loudspeaker can be selected according to the actual application requirements.

[0113] In the actual implementation process, the installation methods of the speaker unit include, but are not limited to, plate hole snap connection, clip embedding, and integration, etc. The installation method can be selected according to the actual application requirements.

[0114] Refer to Figure 5 , which shows the step flowchart of an air conditioner noise reduction method provided by an embodiment of the present application. The air conditioner noise reduction method can be applied to the air conditioner noise reduction system provided by this embodiment.

[0115] S101: According to the current driving information of the vehicle, execute the target noise reduction strategy corresponding to the current driving information for noise reduction.

[0116] Among them, the target noise reduction strategy is the first noise reduction strategy for noise reduction according to the original noise signal, or the second noise reduction strategy for noise reduction according to the original noise signal and the cockpit noise signal.

[0117] In the actual implementation process, the first noise reduction strategy can be a fixed filter noise reduction strategy, and the second noise reduction strategy is an adaptive filter noise reduction strategy.

[0118] When the vehicle uses the air conditioner under different vehicle conditions, the sources of noise inside the vehicle also vary. For example, when the vehicle is stationary and the air conditioner is turned on, the main noise inside the vehicle is the air conditioner noise; when the vehicle is in a driving state with a relatively low vehicle speed, the sources of noise inside the vehicle include air conditioner noise and non-air conditioner noise, and the non-air conditioner noise includes environmental noises such as road noise, wind noise, engine noise, and tire noise; when the vehicle is in a driving state with a relatively high vehicle speed, the main noise inside the vehicle is mainly non-air conditioner noise.

[0119] Therefore, according to the different components of the in-vehicle noise caused by different driving information, the target noise reduction strategy adapted to the current vehicle condition can be determined based on the driving information of the vehicle. For example, the target noise reduction strategy applicable to the current vehicle condition can be determined according to the current vehicle speed of the vehicle for noise reduction.

[0120] In the actual implementation process, the current vehicle speed of the vehicle can be obtained through the vehicle's CAN system.

[0121] According to the current vehicle speed, the target noise reduction strategy applicable to the current vehicle condition is determined for noise reduction. The target noise reduction processes corresponding to different vehicle speeds include: A1: When the current vehicle speed of the vehicle indicates that the vehicle is in a stationary state, the first noise reduction strategy is used as the target noise reduction strategy.

[0122] Specifically, when the current vehicle speed of the vehicle is 0, it indicates that the vehicle is in a stationary state. When the vehicle is stationary and the air conditioner is turned on, the main noise inside the vehicle is mainly the air conditioner noise. At this time, the first noise reduction strategy can be used as the target noise reduction strategy, that is, noise reduction is performed according to the original noise signal at the air outlet of the air conditioner duct, which can more accurately reduce the air conditioner noise and the noise reduction effect is better.

[0123] A2: When the current vehicle speed of the vehicle indicates that the vehicle is in a driving state and the current vehicle speed is less than the first vehicle speed, when the cockpit noise signal meets the adaptive noise reduction condition, the second noise reduction strategy is used as the target noise reduction strategy.

[0124] When the vehicle is driving and the air conditioner is turned on, the sources of noise inside the vehicle include not only the air conditioner noise but also non-air conditioner noises such as road noise, wind noise, engine noise, and tire noise.

[0125] When the vehicle is in a driving state, the acquisition of the air-conditioning duct noise of the vehicle will be affected by dynamic noise, i.e., non-air-conditioning noise. According to the first noise reduction strategy for noise reduction based on the original noise signal in the air-conditioning duct, the noise at the human ear cannot be accurately predicted, and only the broadband noise of the air conditioner is processed. Moreover, limited by the size of the air-conditioning duct, the size of the microphone, and the assembly difficulty, the number of microphones set at the air outlet of the air-conditioning duct is also limited, which increases the difficulty of capturing a complex noise sound field.

[0126] Therefore, as the number of noise sources increases when the vehicle is in a driving state, the first noise reduction strategy has poor adaptability to noise changes and cannot comprehensively and accurately capture the noise in the surrounding environment. In some areas or at specific frequencies, the noise reduction effect of the first noise reduction strategy will be significantly weakened. Especially for noises with higher frequencies or stronger directivities, the first noise reduction strategy may not be able to effectively perform noise reduction processing.

[0127] Therefore, when the current vehicle speed of the vehicle represents that the vehicle is in a driving state and the current vehicle speed is less than the first vehicle speed, this method can determine whether to use the second noise reduction strategy as the target noise reduction strategy.

[0128] The first vehicle speed is the critical vehicle speed at which the main noise in the vehicle is non-air-conditioning noise or air-conditioning noise. If the main noise in the vehicle is non-air-conditioning noise, the effect of air-conditioning noise reduction is not obvious at this time, so there is no need to continue the noise reduction process; if the main noise in the vehicle is air-conditioning noise, the noise reduction process can be continued to improve the user's driving experience.

[0129] The first vehicle speed can be determined according to the pre-calibrated distribution of the main noise in the vehicle at different vehicle speeds. For example, the first vehicle speed can be 80 km / h.

[0130] Since the vehicle speed is not 0, that is, when the vehicle is in a driving state, the noise inside the vehicle includes both air-conditioning noise and non-air-conditioning noise. However, when the current vehicle speed of the vehicle is less than the first vehicle speed, it is not yet possible to determine whether the main noise in the vehicle is air-conditioning noise or non-air-conditioning noise. This method provides a method for judging whether the main noise in the vehicle is air-conditioning noise or non-air-conditioning noise based on the cockpit noise signal, and thus can determine whether the current vehicle condition can be noise-reduced based on the second noise reduction strategy.

[0131] Specifically, when the current vehicle speed of the vehicle represents that the vehicle is in a driving state and the current vehicle speed is less than the first vehicle speed, by judging whether the cockpit noise signal meets the adaptive noise reduction condition, it is determined whether the main noise in the vehicle is air-conditioning noise or non-air-conditioning noise, and then it is determined whether the second noise reduction strategy can be used for noise reduction.

[0132] First, perform a spectral analysis on the cockpit noise signal to determine the low-frequency noise and high-frequency noise. The low-frequency noise is non-air-conditioning noise, and the high-frequency noise is air-conditioning noise.

[0133] In the actual implementation process, low-frequency noise and high-frequency noise can be divided according to pre-calibration. For example, the low-frequency noise is the noise in the range of 30 - 350 Hz; the high-frequency noise is the noise in the range of 350 - 1000 Hz.

[0134] Then, determine the difference between the average sound pressure value of the low-frequency noise and the average sound pressure value of the high-frequency noise.

[0135] When the difference is greater than the target value, it indicates that the main noise in the vehicle is non-air-conditioning noise, and the cabin noise signal does not meet the adaptive noise reduction condition. At this time, the effect of air-conditioning noise reduction is not obvious, and the noise reduction process is stopped.

[0136] When the difference is less than or equal to the target value, it indicates that the main noise in the vehicle is air-conditioning noise, and the cabin noise signal meets the adaptive noise reduction condition. Take the second noise reduction strategy as the target noise reduction strategy, and perform noise reduction according to the original noise signal and the cabin noise signal, which can improve the user's driving experience.

[0137] The target value can be set according to the actual application requirements. For example, the target can be set to 10 dB.

[0138] A3: When the current vehicle speed of the vehicle indicates that the vehicle is in a driving state and the current vehicle speed is greater than or equal to the first vehicle speed, stop the noise reduction process.

[0139] When the current vehicle speed of the vehicle is greater than or equal to the first vehicle speed, for example, when the vehicle speed is greater than 80 km / h, the main noise of the vehicle is non-air-conditioning noise. At this time, performing the noise reduction process will also have limited effect, and the noise reduction process can be stopped to save vehicle energy consumption; the processing unit can also monitor the change of the vehicle speed in real time. When the vehicle speed drops below 80 km / h, determine whether to perform the second noise reduction strategy for noise reduction according to the cabin noise signal.

[0140] S102: When the target noise reduction strategy is the first noise reduction strategy, perform noise reduction according to the original noise signal collected from the vehicle's air-conditioning duct.

[0141] Specifically, when the vehicle's air conditioner is turned on and the current vehicle speed of the vehicle is 0, perform the first noise reduction strategy for noise reduction. The first noise reduction strategy includes: generating and emitting a first anti-phase noise reduction wave with the same frequency and opposite phase as the original noise signal according to the original noise signal, so as to perform noise reduction through sound field superposition.

[0142] S103: When the target noise reduction strategy is the second noise reduction strategy, perform noise reduction according to the original noise signal and the cabin noise signal collected from the vehicle's cabin.

[0143] Specifically, when the vehicle's air conditioner is turned on and the current vehicle speed is greater than 0 and less than 80 km / h, if the difference between the average sound pressure value of the noise in the range of 30 - 350 Hz and the average sound pressure value of the noise in the range of 350 - 1000 Hz is less than or equal to 10 dB, it indicates that the main noise inside the vehicle is the air conditioner noise, and the second noise reduction strategy is executed for noise reduction.

[0144] The second noise reduction strategy includes: using the original noise signal as the reference signal, using the cockpit noise signal collected in real time by the cockpit noise acquisition module as the error signal, executing an adaptive filtering algorithm, generating and emitting a second anti-phase noise reduction wave to perform noise reduction through sound field superposition.

[0145] Exemplarily, the adaptive filtering algorithm can include the RLS algorithm, the LMS algorithm, and the FxLMS algorithm. In the actual application process, other adaptive filtering algorithms can also be used, and this embodiment does not make any limitations.

[0146] For example, in the FxLMS algorithm, based on the cockpit noise signal as the error signal, the weights of the adaptive filter in the FxLMS algorithm can be updated, and the final output second anti-phase noise reduction wave can be corrected through the feedback of the error signal.

[0147] Calibrating the anti-phase noise reduction wave determined according to the original noise signal based on the cockpit noise signal inside the vehicle can more accurately detect the noise actually received by the human ear, and perform real-time feedback and adjustment, so as to more effectively reduce the residual air conditioner noise at the human ear in a complex noise environment.

[0148] When the vehicle's air conditioner is turned on and the current vehicle speed is greater than or equal to 80 km / h, or although the vehicle speed is less than 80 km / h, but the difference between the average sound pressure value of the noise in the range of 30 - 350 Hz and the average sound pressure value of the noise in the range of 350 - 1000 Hz is greater than 10 dB, at this time the main noise inside the vehicle is non-air conditioner noise, and the noise reduction effect of executing the noise reduction process is limited, so the noise reduction process is stopped to save vehicle energy consumption.

[0149] In a feasible implementation manner, it is also possible to determine whether the current noise reduction execution condition is met according to the original noise signal, and the noise reduction execution condition includes determining whether there is a fault in the air conditioner. If there is an air conditioner fault, the noise reduction execution condition is not met.

[0150] Specifically, when determining whether the current noise reduction execution condition is met according to the original noise signal, the original noise signal is compared with a preset fault noise threshold.

[0151] The fault noise threshold can be set through pre-calibration. During the calibration process, the noise decibel value range of the vehicle's air conditioner operating normally in different modes or gears is obtained. According to the maximum noise decibel value of the air conditioner obtained by calibration, a fault noise threshold is set. For example, the sum of the maximum noise decibel value and the redundant noise decibel value is used as the fault noise threshold, and the size of the redundant noise decibel value can be selected according to the actual application requirements.

[0152] When the collected original noise signal is less than or equal to the fault noise threshold, it indicates that the air conditioner is operating normally and meets the noise reduction execution condition.

[0153] When the collected original noise signal is greater than the preset fault noise threshold, it indicates that the air conditioner has a fault and does not meet the noise reduction execution condition. The noise reduction process can be stopped, and an air conditioner fault warning signal can be sent to the vehicle's on-board computer. The on-board computer can prompt the user about the current air conditioner fault according to the air conditioner fault warning signal to prompt the user to repair the air conditioner in time.

[0154] By setting the fault noise threshold and comparing the current original noise signal with the fault noise threshold in real time, it is more intuitive to diagnose whether the vehicle's air conditioner has a fault, which can avoid the impact of air conditioner faults on the air conditioner noise reduction system, reduce the divergence risk of the air conditioner noise reduction system, and improve the stability of the air conditioner noise reduction system.

[0155] In the actual implementation process, in addition to judging whether the air conditioner has a fault according to the noise, it is also possible to judge whether the vehicle's air conditioner has a fault by obtaining the air conditioner parameters of the vehicle, such as the refrigeration system pressure coefficient, temperature parameter, and air volume parameter, etc. When the air conditioner has a fault, the current noise reduction process is stopped.

[0156] Refer to Figure 6 , which shows the execution flow chart of the air conditioner noise reduction method provided by the embodiment of the present application. The air conditioner noise reduction method includes the following steps: S1: Obtain the air conditioner status information of the vehicle.

[0157] S2: Judge whether the air conditioner is in the on state.

[0158] When the air conditioner is in the on state, execute step S3; When the air conditioner is in the off state, execute step S14.

[0159] S3: Obtain the original noise signal of the air conditioner duct.

[0160] S4: Judge whether the original noise signal is greater than the fault noise threshold.

[0161] When the original noise signal is greater than the fault noise threshold, execute step S5; When the original noise signal is less than or equal to the fault noise threshold, execute step S6.

[0162] S5: Send an air - conditioning fault warning signal to the vehicle's in - vehicle computer.

[0163] Continue to execute step S3.

[0164] S6: Obtain the current vehicle speed.

[0165] S7: Determine whether the vehicle is currently in a stationary state.

[0166] When the vehicle is currently in a stationary state, execute step S8; When the vehicle is not currently in a stationary state but in a driving state, execute step S9.

[0167] S8: Execute the first noise reduction strategy for noise reduction.

[0168] The first noise reduction strategy includes: generating and emitting a first anti - phase noise reduction wave with the same frequency and opposite phase as the original noise signal according to the original noise signal, so as to perform noise reduction through sound field superposition. Continue to execute step S1.

[0169] S9: Determine whether the current vehicle speed is greater than the first vehicle speed.

[0170] When the current vehicle speed is less than or equal to the first vehicle speed, execute step S10; When the current vehicle speed is greater than the first vehicle speed, execute step S14.

[0171] S10: Obtain the cabin noise signal inside the vehicle cabin.

[0172] S11: Perform spectral analysis on the cabin noise signal to determine the difference between the average sound pressure value of low - frequency noise and the average sound pressure value of high - frequency noise.

[0173] S12: Determine whether the difference in average sound pressure values is greater than the target value.

[0174] When the difference in average sound pressure values is less than or equal to the target value, execute step S13; When the difference in average sound pressure values is greater than the target value, execute step S14.

[0175] S13: Execute the second noise reduction strategy for noise reduction.

[0176] The second noise reduction strategy includes: using the original noise signal as a reference signal, using the cabin noise signal collected in real - time by the cabin noise acquisition module as an error signal, executing an adaptive filtering algorithm, generating and emitting a second anti - phase noise reduction wave, so as to perform noise reduction through sound field superposition.

[0177] Continue to execute step S1.

[0178] S14: Stop the noise reduction process.

[0179] Continue to execute step S1.

[0180] This method can adjust the noise reduction process in real time according to the changes in the driving information of the vehicle after the vehicle's air conditioner is turned on. When the vehicle is stationary and the main noise inside the vehicle is the air conditioner noise, the first noise reduction strategy is executed, and noise reduction is performed according to the original noise signal at the air outlet of the air conditioner duct, which can more accurately reduce the air conditioner noise.

[0181] When the vehicle is in a driving state and the vehicle speed is less than the first vehicle speed, the noise inside the vehicle includes both air conditioner noise and non-air conditioner noise, but the main noise is still the air conditioner noise. According to the cabin noise signal inside the vehicle cockpit, the noise actually received by the human ear can be detected more accurately, and the second noise reduction strategy is executed. According to the noise actually received by the human ear, real-time feedback and adjustment calibration are performed on the output anti-phase noise reduction wave, so as to more effectively reduce the residual air conditioner noise at the human ear in a complex noise environment and improve the noise reduction effect.

[0182] When the vehicle is in a driving state, the vehicle speed is greater than the first vehicle speed, the noise inside the vehicle is non-air conditioner noise, or the vehicle speed is less than the first vehicle speed, but the main noise inside the vehicle is non-air conditioner noise, stop the noise reduction process to save vehicle energy consumption.

[0183] The air conditioner noise reduction system and the air conditioner noise reduction method provided in this embodiment at least include the following effects: 1. According to the driving information of the vehicle under different vehicle conditions, select and execute the appropriate noise reduction strategy. When the vehicle is stationary, perform noise reduction according to the original noise signal at the air outlet of the air conditioner duct, which can more accurately reduce the air conditioner noise; when the vehicle is driving and the noise sources increase, use the original noise signal as the reference signal and the cabin noise signal as the error signal to perform real-time feedback and adjustment calibration on the anti-phase noise reduction wave output by the speaker unit, ensuring the noise reduction effect at the human ear, enhancing the noise reduction effect, and improving the user's driving experience and user experience.

[0184] 2. Monitor and warn of air conditioner faults, avoiding the risk of divergence of the air conditioner noise reduction system caused by the impulse noise caused by air conditioner faults, and better maintaining the stability of the air conditioner noise reduction system.

[0185] 3. Dynamically adjust the noise reduction process in real time according to the vehicle condition of the vehicle, reduce power consumption and increase battery life, and comprehensively and accurately capture the noise in the surrounding environment, thereby improving the accuracy and coverage of the noise reduction effect.

[0186] 4. The air conditioner noise reduction system does not require regular maintenance and replacement, has a lower cost than passive systems, and does not affect the service life of the vehicle's air conditioner system.

[0187] Refer toFigure 7 , which shows a schematic diagram of an electronic device provided by an embodiment of the present application, including: at least one processor and a memory, where the memory stores a computer program that can run on the processor. Among them, when the processor executes the computer program, it executes the air conditioner noise reduction method described in the embodiment.

[0188] Referring to Figure 8 , which shows a schematic diagram of a non-volatile readable storage medium provided by an embodiment of the present application. The non-volatile readable storage medium stores a computer program. Among them, when the computer program is executed by a processor, it executes the air conditioner noise reduction method described in the embodiment.

[0189] Referring to Figure 9 , which shows a schematic diagram of a computer program product provided by an embodiment of the present application, including a computer program / instructions. When the computer program / instructions are executed by a processor, they implement the air conditioner noise reduction method described in the embodiment.

[0190] This embodiment also provides a vehicle, on which the air conditioner noise reduction system described in the embodiment is provided, or is used to execute the air conditioner noise reduction method described in the embodiment.

[0191] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0192] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, devices, or computer program products. Therefore, the embodiments of the present application can take the form of completely hardware embodiments, completely software embodiments, or embodiments combining software and hardware aspects. Moreover, the embodiments of the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0193] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of methods, terminal devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of the processes and / or blocks in the flowchart and / or block diagram can also be implemented. These computer program instructions can be provided to the processor of a general computer, a special computer, an embedded processor, or other programmable data processing terminal devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal devices generate a device for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0194] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction means that implements the function specified in one or more of the processes and / or blocks Figure 1 one or more of the processes and / or blocks Figure 1 specified in the block or blocks.

[0195] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable apparatus provide steps for implementing the function specified in one or more of the processes and / or blocks Figure 1 one or more of the processes and / or blocks Figure 1 specified in the block or blocks.

[0196] Although the preferred embodiments of the embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present application.

[0197] Finally, it should also be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or apparatus that comprises a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or apparatus that comprises the element.

[0198] Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. An air conditioning noise reduction system, characterized in that: The system comprises: The air outlet noise collection module is used to collect the original noise signal of the air conditioning duct of the vehicle; A cabin noise collection module, used to collect cabin noise signals in the vehicle cabin; A noise reduction processing module, configured to perform noise reduction by executing a target noise reduction strategy corresponding to the current driving information according to the current driving information of the vehicle; The target noise reduction strategy is a first noise reduction strategy for performing noise reduction according to the original noise signal, or a second noise reduction strategy for performing noise reduction according to the original noise signal and the cabin noise signal.

2. The system according to claim 1, characterized in that The first noise reduction strategy is a fixed filter noise reduction strategy, and / or the second noise reduction strategy is an adaptive filter noise reduction strategy.

3. The system according to claim 1, characterized in that The driving information includes vehicle speed; When the current vehicle speed indicates that the vehicle is stationary, the target noise reduction strategy is the first noise reduction strategy.

4. The system according to claim 3, characterized in that The first noise reduction strategy includes: the noise reduction processing module emits a first anti-phase noise reduction wave with the same frequency and opposite phase as the original noise signal according to the original noise signal collected by the air outlet noise collection module, so as to reduce noise by sound field superposition.

5. The system according to claim 4, characterized in that The noise reduction processing module includes a processing unit and a speaker unit; The processing unit is used to generate the first inverted noise reduction wave; The speaker unit is used to emit the first anti-phase noise reduction wave.

6. The system according to claim 1, characterized in that The driving information includes vehicle speed; When the current vehicle speed indicates that the vehicle is in a driving state, the current vehicle speed is less than a first vehicle speed, and the cabin noise signal satisfies an adaptive noise reduction condition, the target noise reduction strategy is the second noise reduction strategy, and the first vehicle speed is a critical vehicle speed at which the main noise in the vehicle is non-air-conditioning noise or air-conditioning noise.

7. The system according to claim 6, characterized in that When the difference between the average sound pressure value of the low-frequency noise and the average sound pressure value of the high-frequency noise of the cabin noise signal is less than or equal to the target value, the cabin noise signal meets the adaptive noise reduction condition, the low-frequency noise is non-air-conditioning noise, and the high-frequency noise is air-conditioning noise.

8. The system according to claim 7, characterized in that The low-frequency noise is noise of 30-350 Hz; and / or the high-frequency noise is noise of 350-1000 Hz.

9. The system according to claim 8, characterized in that The target value is 10Db.

10. The system according to claim 6, characterized in that The second noise reduction strategy includes: the noise reduction processing module uses the original noise signal as a reference signal, uses the cabin noise signal collected in real time by the cabin noise collection module as an error signal, executes an adaptive filtering algorithm, and emits a second anti-phase noise reduction wave to perform noise reduction through sound field superposition.

11. The system according to claim 10, characterized in that The noise reduction processing module includes a processing unit and a speaker unit; The processing unit is used to generate the second inverted noise reduction wave; The speaker unit is used to emit the second anti-phase noise reduction wave.

12. The system according to claim 10, characterized in that The adaptive filtering algorithms include RLS algorithm, LMS algorithm and FxLMS algorithm.

13. The system according to claim 1, characterized in that The driving information includes vehicle speed; when the current vehicle speed indicates that the vehicle is in a driving state and the current vehicle speed is greater than or equal to a first vehicle speed, the noise reduction processing module is used to stop the noise reduction process.

14. The system according to claim 6 or 13, characterized in that: The first vehicle speed is 80 km / h.

15. The system according to claim 1, characterized in that The noise reduction processing module is used to execute the target noise reduction strategy corresponding to the current driving information to perform noise reduction when the original noise signal meets the noise reduction execution condition.

16. The system according to claim 15, characterized in that When the original noise signal does not meet the noise reduction execution condition, the noise reduction processing module is used to stop the noise reduction process and send an air conditioning failure warning signal to the vehicle computer of the vehicle.

17. The system according to claim 15, characterized in that When the original noise signal is less than or equal to a preset fault noise threshold, the original noise signal meets the noise reduction execution condition.

18. The system according to claim 1, characterized in that The air outlet noise collection module is arranged on the side wall of the air outlet of the air conditioning air duct of the vehicle; The air outlets of the air conditioning duct include a foot-blowing air outlet, a face-blowing air outlet and a defogger air outlet.

19. The system according to claim 18, characterized in that The air outlet noise collection module includes a MEMS microphone.

20. The system according to claim 1, characterized in that The noise reduction processing module includes a speaker unit, and the speaker unit is arranged on the side wall of the duct of the air outlet of the air conditioning duct of the vehicle.

21. The system according to claim 20, characterized in that The speaker unit includes a dynamic speaker, a moving iron speaker, an electrostatic speaker and a planar diaphragm speaker.

22. The system according to claim 1, characterized in that The cabin noise collection module is arranged in each seat headrest of the vehicle.

23. The system according to claim 1, characterized in that The cabin noise collection module is arranged on the roof above each seat of the vehicle.

24. The system according to claim 22 or 23, characterized in that The cabin noise collection module includes a MEMS microphone.

25. An air conditioning noise reduction method, characterized in that: The method comprises: According to the current driving information of the vehicle, executing a target noise reduction strategy corresponding to the current driving information to reduce noise, wherein the target noise reduction strategy includes a first noise reduction strategy or a second noise reduction strategy; When the target noise reduction strategy is the first noise reduction strategy, noise reduction is performed according to the collected original noise signal of the air conditioning duct of the vehicle; When the target noise reduction strategy is the second noise reduction strategy, noise reduction is performed according to the original noise signal and the collected cabin noise signal in the cabin of the vehicle.

26. The method according to claim 25, characterized in that When the current vehicle speed indicates that the vehicle is stationary, the target noise reduction strategy is the first noise reduction strategy.

27. The method according to claim 26, characterized in that The first noise reduction strategy includes: According to the original noise signal, a first anti-phase noise reduction wave having the same frequency and opposite phase as the original noise signal is generated and emitted, so as to perform noise reduction through sound field superposition.

28. The method according to claim 25, characterized in that When the current vehicle speed indicates that the vehicle is in a driving state and the current vehicle speed is less than a first vehicle speed, if the cabin noise signal satisfies an adaptive noise reduction condition, the target noise reduction strategy is the second noise reduction strategy.

29. The method according to claim 28, characterized in that When the difference between the average sound pressure value of the low-frequency noise and the average sound pressure value of the high-frequency noise of the cabin noise signal is less than or equal to the target value, the cabin noise signal meets the adaptive noise reduction condition.

30. The method according to claim 28, characterized in that The second noise reduction strategy includes: The original noise signal is used as a reference signal, and the cabin noise signal collected in real time by the cabin noise collection module is used as an error signal, and an adaptive filtering algorithm is executed to generate and emit a second anti-phase noise reduction wave to perform noise reduction through sound field superposition.

31. The method according to claim 25, characterized in that The method further comprises: When the original noise signal is greater than a preset fault noise threshold, the noise reduction process is stopped, and an air conditioning fault warning signal is sent to the vehicle computer of the vehicle.

32. An electronic device, characterized in that: include: At least one processor, and a memory, wherein the memory stores a computer program that can be run on the processor, wherein the processor executes the air conditioning noise reduction method according to any one of claims 25-31 when executing the computer program.

33. A non-volatile readable storage medium, characterized in that: The non-volatile readable storage medium stores a computer program, wherein the computer program, when executed by a processor, performs the air conditioning noise reduction method according to any one of claims 25 to 31.

34. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the air conditioning noise reduction method described in any one of claims 25-31 is implemented.

35. A vehicle, characterized in that: The vehicle is provided with the air conditioning noise reduction system according to any one of claims 1-24, or is used to execute the air conditioning noise reduction method according to any one of claims 25-31.

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