An air conditioning noise reduction system, method, product, and vehicle

Abstract

This application provides an air conditioning noise reduction system, method, product, and vehicle, belonging to the technical field of vehicle noise reduction. The air conditioning noise reduction system includes an air vent noise acquisition module for acquiring the original noise signal of the vehicle's air conditioning duct; a cabin noise acquisition module for acquiring the cabin noise signal within the vehicle's cabin; and a noise reduction processing module for executing a target noise reduction strategy corresponding to the current driving information of the vehicle. The target noise reduction strategy is either a first noise reduction strategy for noise reduction based on the original noise signal, or a second noise reduction strategy for noise reduction based on both the original noise signal and the cabin noise signal. This application aims to improve noise reduction performance.

Description

Technical Field

[0001] This application relates to the technical field of vehicle noise reduction, specifically to an air conditioning noise reduction system, method, product, and vehicle. Background Technology

[0002] With the rapid development of automobiles, vehicle noise reduction technology has become increasingly mature in order to improve the comfort of users when using vehicles. When the vehicle's air conditioning system is running, some noise is unavoidable. Currently, common noise reduction methods for air conditioning systems include active air conditioning noise reduction, such as duct noise reduction.

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

[0004] This application provides an air conditioning noise reduction system, method, product, and vehicle, aiming to improve noise reduction effect.

[0005] In a first aspect, embodiments of this application provide an air conditioning noise reduction system, the system comprising:

[0006] The air vent noise acquisition module is used to collect the raw noise signal of the vehicle's air conditioning duct.

[0007] The cabin noise acquisition module is used to acquire cabin noise signals inside the vehicle cabin;

[0008] The noise reduction processing module is used to perform noise reduction by executing the target noise reduction strategy corresponding to the current driving information of the vehicle.

[0009] The target noise reduction strategy is either a first noise reduction strategy for noise reduction based on the original noise signal, or a second noise reduction strategy for noise reduction based on the original noise signal and the cabin noise signal.

[0010] 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.

[0011] Optionally, the driving information includes vehicle speed;

[0012] When the current vehicle speed indicates that the vehicle is stationary, the target noise reduction strategy is the first noise reduction strategy.

[0013] 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 collected by the air vent noise acquisition module, so as to reduce noise through sound field superposition.

[0014] Optionally, the noise reduction processing module includes a processing unit and a speaker unit;

[0015] The processing unit is used to generate the first anti-phase noise reduction wave;

[0016] The speaker unit is used to emit the first anti-phase noise reduction wave.

[0017] Optionally, the driving information includes vehicle speed;

[0018] When the current vehicle speed indicates that the vehicle is in motion, and the current vehicle speed is less than a first vehicle speed, and the cabin noise signal meets the adaptive noise reduction conditions, the target noise reduction strategy is the second noise reduction strategy, and the first vehicle speed is the critical speed at which the main noise in the vehicle is either non-air conditioning noise or air conditioning noise.

[0019] Optionally, when the difference between the average sound pressure level of the low-frequency noise and the average sound pressure level of the high-frequency noise in the cabin noise signal is less than or equal to the target value, the cabin noise signal satisfies the adaptive noise reduction condition, wherein the low-frequency noise is non-air conditioning noise and the high-frequency noise is air conditioning noise.

[0020] Optionally, the low-frequency noise is noise of 30-350Hz; and / or, the high-frequency noise is noise of 350-1000Hz.

[0021] Optionally, the target value is 10Db.

[0022] Optionally, the second noise reduction strategy includes: the noise reduction processing module uses the original noise signal as a reference signal and the cabin noise signal collected in real time by the cabin noise acquisition module as an error signal, executes an adaptive filtering algorithm, and emits a second anti-phase noise reduction wave to reduce noise through sound field superposition.

[0023] Optionally, the noise reduction processing module includes a processing unit and a speaker unit;

[0024] The processing unit is used to generate the second anti-phase noise reduction wave;

[0025] The speaker unit is used to emit the second anti-phase noise reduction wave.

[0026] Optionally, the adaptive filtering algorithm includes the RLS algorithm, the LMS algorithm, and the FxLMS algorithm.

[0027] Optionally, the driving information includes vehicle speed; when the current vehicle speed indicates that the vehicle is in motion, 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.

[0028] Optionally, the first vehicle speed is 80 km / h.

[0029] Optionally, the noise reduction processing module is used to perform noise reduction by executing the target noise reduction strategy corresponding to the current driving information when the original noise signal meets the noise reduction execution conditions.

[0030] Optionally, when the original noise signal does not meet the noise reduction execution conditions, the noise reduction processing module is used to stop the noise reduction process and send an air conditioning fault warning signal to the vehicle's infotainment system.

[0031] 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.

[0032] Optionally, the air outlet noise acquisition module is installed on the side wall of the air outlet of the vehicle's air conditioning duct;

[0033] The air conditioning duct outlets include foot-blowing outlets, face-blowing outlets, and defogging outlets.

[0034] Optionally, the vent noise acquisition module includes a MEMS microphone.

[0035] Optionally, the noise reduction module includes a speaker unit, which is disposed on the side wall of the air duct outlet of the vehicle's air conditioning system.

[0036] Optionally, the loudspeaker unit includes a moving coil loudspeaker, a moving iron loudspeaker, an electrostatic loudspeaker, and a planar diaphragm loudspeaker.

[0037] Optionally, the cabin noise acquisition module is installed in each seat headrest of the vehicle.

[0038] Optionally, the cabin noise acquisition module is installed on the roof above each seat of the vehicle.

[0039] Optionally, the cockpit noise acquisition module includes a MEMS microphone.

[0040] Secondly, embodiments of this application provide an air conditioning noise reduction method, the method comprising:

[0041] Based on the current driving information of the vehicle, a target noise reduction strategy corresponding to the current driving information is executed for noise reduction, and the target noise reduction strategy includes a first noise reduction strategy or a second noise reduction strategy.

[0042] When the target noise reduction strategy is the first noise reduction strategy, noise reduction is performed based on the original noise signal of the vehicle's air conditioning duct collected.

[0043] When the target noise reduction strategy is the second noise reduction strategy, noise reduction is performed based on the original noise signal and the collected cabin noise signal inside the vehicle's cabin.

[0044] Optionally, if the current vehicle speed indicates that the vehicle is stationary, the target noise reduction strategy is the first noise reduction strategy.

[0045] Optionally, the first noise reduction strategy includes:

[0046] Based on the original noise signal, a first anti-phase noise reduction wave with the same frequency and opposite phase as the original noise signal is generated and emitted to reduce noise through sound field superposition.

[0047] Optionally, if the current vehicle speed indicates that the vehicle is in motion, and the current vehicle speed is less than a first vehicle speed, and the cabin noise signal meets the adaptive noise reduction condition, the target noise reduction strategy is the second noise reduction strategy.

[0048] Optionally, when the difference between the average sound pressure level of the low-frequency noise and the average sound pressure level of the high-frequency noise in the cabin noise signal is less than or equal to the target value, the cabin noise signal satisfies the adaptive noise reduction condition.

[0049] Optionally, the second noise reduction strategy includes:

[0050] Using the original noise signal as a reference signal and the cabin noise signal collected in real time by the cabin noise acquisition module as an error signal, an adaptive filtering algorithm is executed to generate and emit a second anti-phase noise reduction wave, so as to reduce noise through sound field superposition.

[0051] Optionally, the method further includes:

[0052] When the original noise signal exceeds a preset fault noise threshold, the noise reduction process is stopped, and an air conditioning fault warning signal is sent to the vehicle's infotainment system.

[0053] Thirdly, embodiments of this application provide an electronic device, including: at least one processor and a memory, the memory storing a computer program executable on the processor, wherein the processor executes the computer program to perform the air conditioning noise reduction method described in the second aspect of the embodiment.

[0054] Fourthly, embodiments of this application provide a non-volatile readable storage medium storing a computer program, wherein the computer program, when executed by a processor, performs the air conditioning noise reduction method described in the second aspect of the embodiment.

[0055] Fifthly, embodiments of this application provide a computer program product, including a computer program / instructions, which, when executed by a processor, implement the air conditioning noise reduction method described in the second aspect of the embodiments.

[0056] Sixthly, embodiments of this application provide a vehicle equipped with the air conditioning noise reduction system described in the first aspect of the embodiment, or for performing the air conditioning noise reduction method described in the second aspect of the embodiment.

[0057] Beneficial effects:

[0058] This system has an air vent noise acquisition module installed in the vehicle's air conditioning duct to collect the original noise signal at the air conditioning duct, and a cabin noise acquisition module installed in the vehicle's cabin to collect the cabin noise signal.

[0059] The sources of noise inside a vehicle vary depending on the vehicle's driving conditions. During the noise reduction process, the target noise reduction strategy corresponding to the current driving conditions is determined based on the vehicle's driving information. This strategy is either the first noise reduction strategy, which reduces noise based on the original noise signal, or the second noise reduction strategy, which reduces noise based on both the original noise signal and the cabin noise signal. This allows the target noise reduction strategy to be adaptively adjusted based on the vehicle's driving information, thereby improving the noise reduction effect of the vehicle under the current driving conditions. Attached Figure Description

[0060] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0061] Figure 1 This is a functional block diagram of an air conditioning noise reduction system according to an embodiment of this application;

[0062] Figure 2 This is a functional block diagram of an air conditioning noise reduction system according to an embodiment of this application;

[0063] Figure 3 This is a denoising diagram of the first denoising strategy provided in an embodiment of this application;

[0064] Figure 4 This is a denoising diagram of the second denoising strategy proposed in an embodiment of this application;

[0065] Figure 5 This is a flowchart of the steps of an air conditioning noise reduction method according to an embodiment of this application;

[0066] Figure 6 This is a flowchart illustrating the execution of an air conditioning noise reduction method according to an embodiment of this application;

[0067] Figure 7 This is a schematic diagram of an electronic device according to an embodiment of this application;

[0068] Figure 8 This is a schematic diagram of a non-volatile readable storage medium provided in an embodiment of this application;

[0069] Figure 9 This is a schematic diagram of a computer program product proposed in an embodiment of this application. Detailed Implementation

[0070] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0071] With the rapid development of the automotive industry, vehicle noise reduction technology has become increasingly mature in order to improve the comfort of users when using vehicles. When the vehicle's air conditioning system is running, some noise is unavoidable. Currently, common air conditioning system noise reduction methods include passive air conditioning noise reduction and active air conditioning noise reduction.

[0072] Passive air conditioning noise reduction often uses special sound insulation materials and equipment, such as sound insulation foam boards, noise reduction blankets, silencers, or soundproof covers. However, these sound insulation and noise reduction materials are expensive, increasing the overall cost of the vehicle. At the same time, passive noise reduction measures may affect the ventilation and heat dissipation of the air conditioning, thereby affecting the working efficiency and lifespan of the air conditioning. Moreover, passive noise reduction equipment requires regular maintenance and replacement, increasing the later maintenance costs.

[0073] In active air conditioning noise reduction, there are common methods such as duct noise reduction and adaptive noise reduction. However, duct noise reduction is based on the sound inside the air conditioning vent duct and cannot effectively solve the noise after the air conditioning system vent. For example, it is difficult to accurately predict the noise at the human ear, and its adaptability and adjustability are also poor. It cannot adapt to the differences in acoustic transmission characteristics caused by vehicle aging, thus the noise reduction effect will decrease.

[0074] While adaptive noise reduction collects noise from inside the air conditioner and places residual noise microphones near the ear, it results in a relatively high overall cost for the noise reduction system and requires a large amount of computing power. When the vehicle is in a normal stationary state, there is a lack of masking effect, so the air conditioner noise will be more prominent. Due to the statistically stable characteristics of air conditioner noise, the benefits of the adaptive system are not significant.

[0075] Current active air conditioning noise reduction methods have the problem that when the vehicle is in a situation where road noise or wind noise is significant, turning on the air conditioning does not have a significant noise reduction effect, and the overall noise reduction effect is relatively weak.

[0076] Therefore, this application provides an air conditioning noise reduction system that can improve noise reduction effect and optimize the user's riding experience.

[0077] Reference Figure 1 The diagram shows a functional block diagram of an air conditioning noise reduction system according to an embodiment of this application. The air conditioning 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.

[0078] Specifically, the air vent noise acquisition module is used to collect the raw noise signal of the vehicle's air conditioning duct. The raw noise signal mainly represents the vehicle's air conditioning noise.

[0079] For example, the air vent noise acquisition module can be installed on the side wall of the air duct outlet of the vehicle's air conditioning system. The air duct outlet includes foot vents, face vents, and defogging vents. In actual implementation, the installation location of the air vent noise acquisition module can be selected according to the actual application requirements.

[0080] The vent noise acquisition module may include a MEMS microphone. In addition to using a small MEMS microphone, other microphones that can acquire sound signals may also be used in actual implementation. This embodiment does not limit the type and number of microphones for acquiring noise.

[0081] The installation methods for the air vent noise acquisition module include, but are not limited to, plate hole snap connection, clip embedding, and integration. The installation method can be selected according to the actual application requirements.

[0082] The cabin noise acquisition module is used to collect cabin noise signals inside the vehicle cabin, mainly for collecting noise near the ears of people inside the vehicle.

[0083] For example, the cabin noise acquisition module can be installed in the headrests of each seat in the vehicle, or on the roof above each seat in the vehicle.

[0084] The cockpit noise acquisition module may also include a MEMS microphone. In addition to using a small MEMS microphone, other microphones that can acquire sound signals may also be used in actual implementation. This embodiment does not limit the type and number of microphones for acquiring noise.

[0085] In practice, in addition to installing physical microphone units on the headrests or roof above the seats as cabin noise acquisition modules, virtual microphone algorithms can also be used to help obtain more accurate cabin noise signals to the user's ears.

[0086] Since microphones cannot be placed near the human eardrum, it is impossible to achieve sufficient noise reduction for sounds heard by the human ear. In virtual microphone algorithms, a more accurate and better noise reduction effect can be achieved at the desired human ear by measuring the system model from the physical microphone to the virtual microphone. When using virtual microphone algorithms to assist in acquiring 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, reduce equipment costs and system complexity, and not increase hardware costs too much.

[0087] The noise reduction processing module is used to perform noise reduction by executing a target noise reduction strategy corresponding to the current driving information based on the current driving information of the vehicle. The target noise reduction strategy is either a first noise reduction strategy for noise reduction based on the original noise signal, or a second noise reduction strategy for noise reduction based on the original noise signal and the cabin noise signal.

[0088] In actual implementation, 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.

[0089] Specifically, the vehicle's current driving information includes speed. When the air conditioning is on, the sources of noise inside the vehicle differ at different driving speeds. For example:

[0090] When the vehicle is stationary, the main noise inside the vehicle is the air conditioning noise.

[0091] When a vehicle is traveling at a low speed, the noise inside the vehicle includes air conditioning noise and non-air conditioning noise. Non-air conditioning noise includes environmental noise such as road noise, wind noise, engine noise, and tire noise.

[0092] When a vehicle is traveling at high speeds, the main noise inside the vehicle is non-air conditioning noise.

[0093] Therefore, the noise reduction processing module can determine the target noise reduction strategy to be executed based on the vehicle's current speed.

[0094] In one feasible implementation, when the vehicle's current speed indicates that the vehicle is stationary, the target noise reduction strategy is the first noise reduction strategy.

[0095] 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 vent noise acquisition module, so as to reduce noise through sound field superposition.

[0096] When the vehicle's air conditioning is turned on and the vehicle's current speed is 0, i.e., the vehicle is stationary, the main noise inside the vehicle is air conditioning noise. At this time, the first noise reduction strategy can be implemented based on the original noise signal of the air conditioning duct. This strategy generates and emits a first anti-phase noise reduction wave with the same frequency and opposite phase as the original noise signal. Through sound field superposition, the air conditioning noise can be reduced more accurately, enhancing the noise reduction effect.

[0097] When the vehicle's current speed indicates that the vehicle is in motion, it is necessary to determine whether the main noise inside the vehicle is air conditioning noise or non-air conditioning noise.

[0098] Specifically, by judging the magnitude of the vehicle's current speed and the initial speed, it can be preliminarily determined whether the main noise inside the vehicle is air conditioning noise or non-air conditioning noise.

[0099] The first vehicle speed is the critical speed at which the main noise in the vehicle is either non-air conditioning noise or air conditioning noise. For example, the first vehicle speed can be set to 80 km / h. In actual implementation, the first vehicle speed can also be set according to the actual application requirements. This embodiment does not impose any restrictions.

[0100] If the current vehicle speed is greater than or equal to the first vehicle speed, it indicates that the main noise inside the vehicle is no longer air conditioning noise. At this point, even if a noise reduction process is performed, its noise reduction effect will be limited. Therefore, the noise reduction process can be stopped to save vehicle energy consumption, and the current vehicle speed can continue to be monitored in real time to see if it is less than the first vehicle speed.

[0101] When the current vehicle speed is less than the first vehicle speed, the noise inside the vehicle includes not only air conditioning noise, but also non-air conditioning noise, such as road noise, wind noise, engine noise, and tire noise. It is necessary to further determine whether the main noise inside the vehicle is air conditioning noise or non-air conditioning noise.

[0102] If the main noise inside the vehicle is still air conditioning noise, the noise acquisition module of the air conditioning duct will be affected by dynamic noise, i.e., non-air conditioning noise, due to the influence of non-air conditioning noise. The first noise reduction strategy based on the original noise signal in the air conditioning duct cannot accurately predict the noise at the human ear. It only processes the broadband noise of the air conditioning. Moreover, due to the limitations of the size of the air conditioning duct, the size of the microphone, and the difficulty of assembly, the number of microphones set at the air conditioning duct outlet is also limited, which increases the difficulty for the noise acquisition module to capture complex noise fields.

[0103] Moreover, the first noise reduction strategy is less adaptable to changes in noise. It cannot fully and accurately capture noise in the surrounding environment. In certain areas or at specific frequencies, the noise reduction effect of the first noise reduction strategy will be significantly weakened. In particular, it may not be able to effectively reduce noise at higher frequencies or with strong directionality. Therefore, the second noise reduction strategy can be implemented at this time, combining the original noise data of the air conditioning duct and the cabin noise signal in the vehicle cabin for noise reduction.

[0104] If the main noise inside the car is not from the air conditioning, the noise reduction effect of the air conditioning will not be significant, and there is no need to continue the noise reduction process.

[0105] Specifically, when the current vehicle speed is less than the first vehicle speed, it can be determined whether the main noise inside the vehicle is air conditioning noise or non-air conditioning noise by judging whether the cabin noise signal meets the adaptive noise reduction condition.

[0106] First, by performing spectral analysis on the cabin noise signal, the low-frequency noise and high-frequency noise in the cabin noise signal can be identified. The low-frequency noise is non-air conditioning noise, and the high-frequency noise is air conditioning noise.

[0107] Then, the average sound pressure level of the low-frequency noise and the average sound pressure level of the high-frequency noise of the cabin noise signal can be determined respectively. Based on the difference between the average sound pressure level of the low-frequency noise and the average sound pressure level of the high-frequency noise and the target value, it can be determined that the cabin noise signal meets the adaptive noise reduction condition.

[0108] Specifically, when the difference between the average sound pressure level of the low-frequency noise and the average sound pressure level of the high-frequency noise in the cabin noise signal is less than or equal to the target value, the cabin noise signal satisfies the adaptive noise reduction condition, indicating that the main noise inside the vehicle is air conditioning noise.

[0109] When the difference between the average sound pressure level of the low-frequency noise and the average sound pressure level of the high-frequency noise in the cabin noise signal is greater than the target value, the cabin noise signal does not meet the adaptive noise reduction condition, indicating that the main noise inside the vehicle is non-air conditioning noise.

[0110] In actual implementation, the low-frequency noise can be 30-350Hz noise; and / or, the high-frequency noise can be 350-1000Hz noise. The target value can be set to 10dB, and the low-frequency and high-frequency noise ranges and target values ​​can be set according to the actual application requirements.

[0111] The second noise reduction strategy includes: the noise reduction processing module uses the original noise signal as a reference signal and the cabin noise signal collected in real time by the cabin noise acquisition module as an error signal, executes an adaptive filtering algorithm, and emits a second anti-phase noise reduction wave to reduce noise through sound field superposition.

[0112] For example, the adaptive filtering algorithm includes the RLS algorithm, LMS algorithm and FxLMS algorithm. In actual implementation, other adaptive filtering algorithms can also be used, and this embodiment does not impose any restrictions.

[0113] In the second noise reduction strategy, the anti-phase noise reduction wave determined based on the original noise signal of the air conditioner is calibrated according to the cabin noise signal obtained by the cabin noise acquisition module. This can more accurately detect the noise actually received by the human ear and make real-time feedback and adjustments, thereby more effectively reducing the residual noise of the air conditioner at the human ear in complex noise environments.

[0114] The current vehicle speed indicates that the vehicle is in motion. However, if the current vehicle speed is greater than or equal to the first vehicle speed, the main noise inside the vehicle is non-air conditioning noise. If the noise reduction strategy is continued, the noise reduction effect will be weak. Therefore, the noise reduction processing module can stop the noise reduction process.

[0115] In one feasible implementation, the noise reduction processing module is also used to determine whether the vehicle's air conditioning is faulty. When the air conditioning is not faulty, the target noise reduction strategy can be executed based on the current driving information. When the air conditioning is faulty, the noise reduction process can be stopped.

[0116] Specifically, the presence of a fault in a vehicle's air conditioning system can be determined by assessing whether the original noise signal meets the noise reduction execution conditions.

[0117] For example, 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 conditions. At this time, the air conditioner does not have a fault, and the noise reduction processing module is used to execute the target noise reduction strategy corresponding to the current driving information to perform noise reduction.

[0118] When the original noise signal is greater than the preset fault noise threshold, the original noise signal does not meet the noise reduction execution conditions. At this time, the air conditioner is faulty. The noise reduction processing module is used to stop the noise reduction process and send an air conditioner fault warning signal to the vehicle's infotainment system. The infotainment system can use the air conditioner fault warning signal to prompt the user to repair the air conditioner in a timely manner.

[0119] The preset fault noise threshold can be set through pre-calibration. During the calibration process, the noise decibel range of the vehicle's air conditioner under different modes or gears during normal operation is obtained. Based on the maximum noise decibel value of the air conditioner obtained from the 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. The magnitude of the redundant noise decibel value can be selected according to the actual application requirements.

[0120] 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 conditioning is faulty. This can avoid the impact of air conditioning failure on the air conditioning noise reduction system, reduce the risk of noise dispersion in the air conditioning noise reduction system, and improve the stability of the air conditioning noise reduction system.

[0121] In actual implementation, in addition to judging whether the air conditioner is malfunctioning based on noise, the noise reduction module can also judge whether the vehicle's air conditioner is malfunctioning by obtaining the vehicle's air conditioner parameters, such as the refrigeration system pressure coefficient, temperature parameters, and air volume parameters. When the air conditioner malfunctions, the current noise reduction process is stopped.

[0122] Reference Figure 2 The diagram shows a functional block diagram of an air conditioning noise reduction system according to an embodiment of this application. The noise reduction processing module may further include a processing unit and a speaker unit. The processing unit is connected to the air vent noise acquisition module, the cabin noise acquisition module and the speaker unit respectively. The processing unit can supply power to the air vent noise acquisition module, the cabin noise acquisition module and the speaker unit, or control the activation or deactivation of the air vent noise acquisition module, the cabin noise acquisition module and the speaker unit.

[0123] The processing unit is used to acquire various information about the vehicle, such as the vehicle's air conditioning status and driving information, which are obtained from the vehicle's infotainment system via the vehicle's CAN system.

[0124] For example, when the processing unit obtains that the current air conditioning status of the vehicle is on, the processing unit can send an enable control signal to the air vent noise acquisition module and the speaker unit to prepare to enter the noise reduction process. After the air vent noise acquisition module is enabled, it can acquire the original noise signal of the air conditioning duct and send the original noise signal to the processing unit.

[0125] When the vehicle's current air conditioning status is off, the processing unit can control the deactivation of the air vent noise acquisition module and the speaker unit, thereby reducing energy consumption and extending the lifespan of the noise reduction equipment when the air conditioning is off.

[0126] To further save energy, the processing unit can disable the cabin noise acquisition module when the vehicle is stationary, and enable the cabin noise acquisition module to collect cabin noise signals at the user's ear when the vehicle is in motion and the current vehicle speed is less than a first vehicle speed.

[0127] When the vehicle is in motion and the current speed is greater than or equal to the first speed, the noise reduction process stops. At this time, the processing unit can also control the air vent noise acquisition module, the cabin noise acquisition module and the speaker unit to turn off.

[0128] During the noise reduction process, the processing unit is used to execute the 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.

[0129] Reference Figure 3 The diagram shows a noise reduction schematic of the first noise reduction strategy provided in the embodiment of this application. The vent noise acquisition module sends the acquired original noise signal to the processing unit. The processing unit generates a first anti-phase noise reduction wave with the same frequency and opposite phase as the original noise signal based on the original noise signal.

[0130] The speaker unit serves as a secondary sound source, and the processing unit can send a primary sound source signal to the speaker unit. The primary sound source signal is used to control the speaker unit to emit the first anti-phase noise reduction wave, so as to reduce noise through sound field superposition.

[0131] Reference Figure 4 The diagram illustrates a noise reduction scheme for the second noise reduction strategy provided in this application embodiment. The air vent noise acquisition module sends the acquired raw noise signal to the processing unit, and the cabin noise acquisition module sends the acquired cabin noise signal to the processing unit.

[0132] The processing unit is used to take the original noise signal as a reference signal, the cabin noise signal collected in real time by the cabin noise acquisition module as an error signal, and execute an adaptive filtering algorithm to generate the second inverse noise reduction wave.

[0133] For example, the adaptive filtering algorithm may include the RLS algorithm, LMS algorithm and FxLMS algorithm. In practical applications, other adaptive filtering algorithms may also be used, and this embodiment does not impose any restrictions.

[0134] Taking the FxLMS algorithm as an example, 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 second inverse phase noise reduction wave in the final output can be corrected through the feedback of the error signal.

[0135] The speaker unit serves as a secondary sound source, and the processing unit can send a second-level sound source signal to the speaker unit. The second-level sound source signal is used to control the speaker unit to emit the second anti-phase noise reduction wave, so as to reduce noise through sound field superposition.

[0136] By calibrating the anti-phase noise reduction wave determined based on the original noise signal of the air conditioner using the cabin noise signal obtained from the cabin 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, thereby more effectively reducing the residual noise of the air conditioner at the human ear in complex noise environments.

[0137] In actual implementation, the processing unit may include one or more processing cores, such as a 4-core processor or an 8-core processor. The processing unit may be implemented using at least one hardware form of DSP (Digital Signal Processing), FPGA (Field Programmable Gate Array), and PLA (Programmable Logic Array). This embodiment does not impose any restrictions.

[0138] The speaker unit can also be installed on the side wall of the air outlet of the vehicle's air conditioning duct. The speaker unit and the air outlet noise acquisition module can be installed on the side wall of the air conditioning duct outlet in a uniform arrangement or other manner. However, when installing the speaker unit and the air outlet noise acquisition module, it is necessary to avoid mutual interference between the two and to avoid closed-loop oscillation and howling caused by excessive distance.

[0139] In actual implementation, the loudspeaker unit includes, but is not limited to, moving coil loudspeakers, moving iron loudspeakers, electrostatic loudspeakers, and planar diaphragm loudspeakers. The type and number of loudspeakers can be selected according to the needs of the actual application.

[0140] In actual implementation, the installation methods of the speaker unit include, but are not limited to, plate hole snap connection, clip embedding, and integration. The installation method can be selected according to the actual application requirements.

[0141] Reference Figure 5 The diagram illustrates a flowchart of an air conditioning noise reduction method provided in this embodiment, which can be applied to the air conditioning noise reduction system provided in this embodiment.

[0142] S101: Based on the current driving information of the vehicle, execute the target noise reduction strategy corresponding to the current driving information to perform noise reduction.

[0143] The target noise reduction strategy is either a first noise reduction strategy for noise reduction based on the original noise signal, or a second noise reduction strategy for noise reduction based on the original noise signal and the cabin noise signal.

[0144] In actual implementation, the first noise reduction strategy can be a fixed filter noise reduction strategy, and the second noise reduction strategy can be an adaptive filter noise reduction strategy.

[0145] The sources of noise inside a vehicle vary depending on the vehicle's operating conditions when the air conditioning is used. For example, when the vehicle is stationary and the air conditioning is on, the main noise inside the vehicle is air conditioning noise. When the vehicle is traveling at a low speed, the sources of noise inside the vehicle include both air conditioning noise and non-air conditioning noise. Non-air conditioning noise includes environmental noise such as road noise, wind noise, engine noise, and tire noise. When the vehicle is traveling at a high speed, the main noise inside the vehicle is primarily non-air conditioning noise.

[0146] Therefore, since different driving information leads to different in-vehicle noise components, a target noise reduction strategy suitable for the current vehicle condition can be determined based on the vehicle's driving information. For example, a target noise reduction strategy suitable for the current vehicle condition can be determined based on the vehicle's current speed.

[0147] In practice, the vehicle's current speed can be obtained through the vehicle's CAN system.

[0148] Based on the current vehicle speed, a target noise reduction strategy suitable for the current vehicle condition is determined and noise reduction is performed. The target noise reduction process for different vehicle speeds includes:

[0149] A1: When the current vehicle speed indicates that the vehicle is stationary, the first noise reduction strategy is taken as the target noise reduction strategy.

[0150] Specifically, when the vehicle's current speed is 0, it indicates that the vehicle is stationary. When the air conditioner is turned on while the vehicle is stationary, the main noise inside the vehicle is air conditioning noise. At this time, the first noise reduction strategy can be used as the target noise reduction strategy, that is, noise reduction is performed based on the original noise signal at the air conditioning duct outlet. This can more accurately reduce air conditioning noise and achieve better noise reduction effect.

[0151] A2: When the current vehicle speed indicates that the vehicle is in motion, and the current vehicle speed is less than the first vehicle speed, when the cabin noise signal meets the adaptive noise reduction condition, the second noise reduction strategy is used as the target noise reduction strategy.

[0152] When the air conditioning is on while the vehicle is in motion, the noise sources inside the car include not only air conditioning noise, but also non-air conditioning noise, such as road noise, wind noise, engine noise, and tire noise.

[0153] When the vehicle is in motion, the noise from the vehicle's air conditioning ducts will be affected by dynamic noise, i.e., non-air conditioning noise. The first noise reduction strategy, which reduces noise based on the original noise signal in the air conditioning duct, cannot accurately predict the noise at the human ear. It only processes the broadband noise of the air conditioning. Moreover, due to the limitations of the size of the air conditioning duct, the size of the microphone, and the difficulty of assembly, the number of microphones set at the air outlet of the air conditioning duct is also limited, which increases the difficulty of capturing complex noise sound fields.

[0154] Therefore, as the number of noise sources increases while the vehicle is in motion, the first noise reduction strategy is less adaptable to changes in noise and cannot fully and accurately capture noise in the surrounding environment. In certain areas or at specific frequencies, the noise reduction effect of the first noise reduction strategy will be significantly weakened. In particular, for noise with higher frequencies or stronger directionality, the first noise reduction strategy may not be able to effectively reduce noise.

[0155] Therefore, this method can determine whether to use the second noise reduction strategy as the target noise reduction strategy when the current vehicle speed indicates that the vehicle is in motion and the current vehicle speed is less than the first vehicle speed.

[0156] The first vehicle speed is the critical speed at which the main noise in the vehicle is either non-air conditioning noise or air conditioning noise. If the main noise in the vehicle is non-air conditioning noise, the noise reduction effect of the air conditioning is not obvious, 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 continue to improve the user's driving experience.

[0157] The first vehicle speed can be determined based on the pre-calibrated distribution of main noise inside the vehicle at different speeds. For example, the first vehicle speed could be 80 km / h.

[0158] Since the vehicle speed is not zero, that is, when the vehicle is in motion, the noise inside the vehicle includes both air conditioning noise and non-air conditioning noise. However, when the current vehicle speed is less than the first speed, it is not possible to determine whether the main noise inside the vehicle is air conditioning noise or non-air conditioning noise. This method provides a way to determine whether the main noise inside the vehicle is air conditioning noise or non-air conditioning noise based on the cabin noise signal, and then it can be determined whether the current vehicle condition can be reduced based on the second noise reduction strategy.

[0159] Specifically, when the current vehicle speed indicates that the vehicle is in motion, and the current vehicle speed is less than the first vehicle speed, the system determines whether the cabin noise signal meets the adaptive noise reduction conditions, whether the main noise inside the vehicle is air conditioning noise or non-air conditioning noise, and then determines whether the second noise reduction strategy can be used for noise reduction.

[0160] First, a spectrum analysis of the cabin noise signal is performed to identify 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.

[0161] In actual implementation, low-frequency noise and high-frequency noise can be distinguished according to pre-calibration. For example, the low-frequency noise is noise of 30-350Hz; the high-frequency noise is noise of 350-1000Hz.

[0162] Then, determine the difference between the average sound pressure level of the low-frequency noise and the average sound pressure level of the high-frequency noise.

[0163] When the difference is greater than the target value, it indicates that the main noise inside the vehicle is non-air conditioning noise, and the cabin noise signal does not meet the adaptive noise reduction conditions. At this time, the air conditioning noise reduction effect is not obvious, and the noise reduction process stops.

[0164] When the difference is less than or equal to the target value, the main noise inside the vehicle is identified as air conditioning noise. The cabin noise signal meets the adaptive noise reduction condition. The second noise reduction strategy is used as the target noise reduction strategy. Noise reduction is performed based on the original noise signal and the cabin noise signal, which can improve the user's driving experience.

[0165] The target value can be set according to the actual application requirements; for example, the target can be set to 10dB.

[0166] A3: Stop the noise reduction process when the current vehicle speed indicates that the vehicle is in motion and the current vehicle speed is greater than or equal to the first vehicle speed.

[0167] When the vehicle's current speed is greater than or equal to the first speed, such as when the speed is greater than 80 km / h, the main noise of the vehicle is non-air conditioning noise. At this time, the noise reduction process is limited and can be stopped to save vehicle energy. The processing unit can also monitor the change of vehicle speed in real time. When the speed drops below 80 km / h, it can determine whether to implement the second noise reduction strategy based on the cabin noise signal.

[0168] S102: When the target noise reduction strategy is the first noise reduction strategy, noise reduction is performed based on the original noise signal of the vehicle's air conditioning duct collected.

[0169] Specifically, when the vehicle's air conditioning is turned on and the vehicle's current speed is 0, a first noise reduction strategy is executed to reduce noise. 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, based on the original noise signal, so as to reduce noise through sound field superposition.

[0170] S103: When the target noise reduction strategy is the second noise reduction strategy, noise reduction is performed based on the original noise signal and the collected cabin noise signal inside the vehicle's cabin.

[0171] Specifically, when the vehicle's air conditioning is on and the vehicle's current speed is greater than 0 and less than 80 km / h, if the difference between the average sound pressure level of the noise in the 30-350 Hz range and the average sound pressure level of the noise in the 350-1000 Hz range is less than or equal to 10 dB, the main noise inside the vehicle is identified as air conditioning noise, and the second noise reduction strategy is implemented for noise reduction.

[0172] 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 reduce noise through sound field superposition.

[0173] For example, adaptive filtering algorithms may include RLS, LMS, and FxLMS algorithms. In practical applications, other adaptive filtering algorithms may also be used, and this embodiment does not impose any restrictions.

[0174] In the FxLMS algorithm, the weights of the adaptive filter can be updated based on the cockpit noise signal, which serves as an error signal. The feedback of the error signal is used to correct the second inverse phase noise reduction wave in the final output.

[0175] By calibrating the anti-phase noise reduction wave determined based on the original noise signal in the cabin of the vehicle, the noise actually received by the human ear can be detected more accurately, and real-time feedback and adjustment can be made, thereby more effectively reducing the residual air conditioning noise at the human ear in complex noise environments.

[0176] When the vehicle's air conditioning is on and the vehicle's current speed is greater than or equal to 80 km / h, or even if the speed is less than 80 km / h, but the difference between the average sound pressure level of noise in the 30-350 Hz range and the average sound pressure level of noise in the 350-1000 Hz range is greater than 10 dB, the main noise inside the vehicle is non-air conditioning noise. The noise reduction effect of the noise reduction process is limited, and the noise reduction process should be stopped to save vehicle energy.

[0177] In one feasible implementation, the noise reduction execution conditions can also be determined based on the original noise signal. The noise reduction execution conditions include determining whether the air conditioner is faulty. If the air conditioner is faulty, the noise reduction execution conditions are not met.

[0178] Specifically, when determining whether the noise reduction execution conditions are met based on the original noise signal, the original noise signal is compared with a preset fault noise threshold.

[0179] A fault noise threshold can be set by pre-calibration. During the calibration process, the noise decibel range of the vehicle's air conditioning under different modes or gears during normal operation is obtained. Based on the maximum noise decibel value of the air conditioning obtained from the 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. The magnitude of the redundant noise decibel value can be selected according to the actual application requirements.

[0180] When the acquired raw 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 conditions.

[0181] When the acquired raw noise signal exceeds the preset fault noise threshold, it indicates that the air conditioner has malfunctioned and does not meet the noise reduction execution conditions. The noise reduction process can be stopped, and an air conditioner fault warning signal can be sent to the vehicle's infotainment system. The infotainment system can then use the air conditioner fault warning signal to alert the user to the current air conditioner malfunction and prompt the user to repair the air conditioner in a timely manner.

[0182] 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 conditioning is faulty. This can avoid the impact of air conditioning failure on the air conditioning noise reduction system, reduce the risk of noise dispersion in the air conditioning noise reduction system, and improve the stability of the air conditioning noise reduction system.

[0183] In practice, in addition to judging whether the air conditioner is malfunctioning based on noise, the air conditioner parameters of the vehicle, such as the pressure coefficient of the refrigeration system, temperature parameters, and air volume parameters, can also be obtained to determine whether the air conditioner is malfunctioning. When the air conditioner malfunctions, the current noise reduction process is stopped.

[0184] Reference Figure 6 The diagram illustrates the execution flowchart of an air conditioning noise reduction method provided in an embodiment of this application. The air conditioning noise reduction method includes the following steps:

[0185] S1: Obtain the vehicle's air conditioning status information.

[0186] S2: Determine if the air conditioner is on.

[0187] When the air conditioner is on, proceed to step S3;

[0188] When the air conditioner is off, proceed to step S14.

[0189] S3: Obtain the raw noise signal of the air conditioning duct.

[0190] S4: Determine whether the original noise signal is greater than the fault noise threshold.

[0191] When the original noise signal is greater than the fault noise threshold, proceed to step S5;

[0192] When the original noise signal is less than or equal to the fault noise threshold, proceed to step S6.

[0193] S5: Sends an air conditioning malfunction warning signal to the vehicle's infotainment system.

[0194] Continue with step S3.

[0195] S6: Get the vehicle's current speed.

[0196] S7: Determine whether the vehicle is currently stationary.

[0197] When the vehicle is currently stationary, proceed to step S8;

[0198] When the vehicle is not currently stationary but in motion, proceed to step S9.

[0199] S8: Perform noise reduction using the first noise reduction strategy.

[0200] 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, based on the original noise signal, so as to reduce noise through sound field superposition.

[0201] Continue with step S1.

[0202] S9: Determine if the vehicle's current speed is greater than the first speed.

[0203] When the vehicle's current speed is less than or equal to the first speed, proceed to step S10.

[0204] When the vehicle's current speed is greater than the first speed, proceed to step S14.

[0205] S10: Acquire cabin noise signals within the vehicle's cockpit.

[0206] S11: Perform spectral analysis on the cabin noise signal to determine the difference between the average sound pressure level of low-frequency noise and the average sound pressure level of high-frequency noise.

[0207] S12: Determine whether the difference in average sound pressure levels is greater than the target value.

[0208] When the difference in average sound pressure levels is less than or equal to the target value, proceed to step S13.

[0209] When the difference in average sound pressure levels is greater than the target value, proceed to step S14.

[0210] S13: Execute the second noise reduction strategy for noise reduction.

[0211] 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 reduce noise through sound field superposition.

[0212] Continue with step S1.

[0213] S14: Stop the noise reduction process.

[0214] Continue with step S1.

[0215] This method can adjust the noise reduction process in real time according to changes in the vehicle's driving information after the air conditioner is turned on. When the vehicle is stationary and the main noise inside the vehicle is air conditioner noise, the first noise reduction strategy is executed, and noise reduction is performed based on the original noise signal at the air conditioner vent, which can reduce air conditioner noise more accurately.

[0216] When the vehicle is in motion and the speed is less than the first speed, the noise inside the vehicle includes both air conditioning noise and non-air conditioning noise, but the main noise is still air conditioning noise. Based on the cabin noise signal inside the vehicle cabin, the noise actually received by the human ear can be detected more accurately, and a second noise reduction strategy can be implemented. Based on the noise actually received by the human ear, the output inverse noise reduction wave is fed back and adjusted in real time, thereby more effectively reducing the residual air conditioning noise at the human ear in complex noise environments and improving the noise reduction effect.

[0217] When the vehicle is in motion, if the speed is greater than the first speed limit and the noise inside the vehicle is not air conditioning noise, or if the speed is less than the first speed limit but the main noise inside the vehicle is not air conditioning noise, the noise reduction process will be stopped to save vehicle energy.

[0218] The air conditioning noise reduction system and method provided in this embodiment have at least the following effects:

[0219] 1. Based on the vehicle's driving information under different driving conditions, select and implement appropriate noise reduction strategies. When the vehicle is stationary, noise reduction is performed based on the original noise signal at the air conditioning vent, which can more accurately reduce air conditioning noise. When the vehicle is in motion and the noise source increases, the original noise signal is used as a reference signal and the cabin noise signal is used as an error signal to provide real-time feedback and adjustment calibration to the inverse 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.

[0220] 2. Fault monitoring and early warning for air conditioners are implemented to avoid the risk of noise dispersion in the air conditioning noise reduction system caused by the impact noise of air conditioner malfunctions, and to better maintain the stability of the air conditioning noise reduction system.

[0221] 3. The noise reduction process is dynamically adjusted in real time according to the vehicle's condition, reducing power consumption and increasing battery life. It comprehensively and accurately captures noise in the surrounding environment, thereby improving the accuracy and coverage of the noise reduction effect.

[0222] 4. The air conditioning noise reduction system does not require regular maintenance or replacement, is less expensive than passive systems, and will not affect the lifespan of the vehicle's air conditioning system.

[0223] Reference Figure 7 The diagram illustrates an electronic device according to an embodiment of this application, including: at least one processor and a memory, the memory storing a computer program executable on the processor, wherein the processor executes the computer program to perform the air conditioning noise reduction method described in the embodiment.

[0224] Reference Figure 8 The diagram illustrates a non-volatile readable storage medium provided in an embodiment of this application. 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 described in the embodiment.

[0225] Reference Figure 9 The diagram illustrates a computer program product provided in an embodiment of this application, including a computer program / instruction that, when executed by a processor, implements the air conditioning noise reduction method described in the embodiment.

[0226] This embodiment also provides a vehicle equipped with the air conditioning noise reduction system described in the embodiment, or for performing the air conditioning noise reduction method described in the embodiment.

[0227] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0228] Those skilled in the art will understand that embodiments of this application can be provided as methods, apparatus, or computer program products. Therefore, embodiments of this application can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of this application can take the form of computer program products 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.

[0229] This application describes embodiments with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, as well as combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0230] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0231] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0232] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0233] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0234] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An air conditioning noise reduction system, characterized in that, The system includes: The air vent noise acquisition module is used to collect the raw noise signal of the vehicle's air conditioning duct. The cabin noise acquisition module is used to acquire cabin noise signals inside the vehicle cabin; The noise reduction processing module is used to execute a target noise reduction strategy corresponding to the current driving information of the vehicle for noise reduction, and to adjust the target noise reduction strategy for noise reduction according to the current driving information of the vehicle, wherein the current driving information includes the current vehicle speed; The target noise reduction strategy is either a first noise reduction strategy for noise reduction based on the original noise signal, or a second noise reduction strategy for noise reduction based on the original noise signal and the cabin noise signal. When the current vehicle speed indicates that the vehicle is stationary, the target noise reduction strategy is the first noise reduction strategy. When the current vehicle speed indicates that the vehicle is in motion, and the current vehicle speed is less than a first vehicle speed, and the cabin noise signal satisfies the adaptive noise reduction condition based on the difference between the average sound pressure level of low-frequency noise and the average sound pressure level of high-frequency noise and the target value, the target noise reduction strategy is the second noise reduction strategy. The first vehicle speed is the critical speed at which the main noise in the vehicle is either non-air conditioning noise or air conditioning noise.

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 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 vent noise acquisition module, so as to reduce noise through sound field superposition.

4. The system according to claim 3, characterized in that, The noise reduction module includes a processing unit and a speaker unit; The processing unit is used to generate the first anti-phase noise reduction wave; The speaker unit is used to emit the first anti-phase noise reduction wave.

5. The system according to claim 1, characterized in that, When the difference between the average sound pressure level of the low-frequency noise and the average sound pressure level of the high-frequency noise in the cabin noise signal is less than or equal to the target value, the cabin noise signal satisfies the adaptive noise reduction condition. The low-frequency noise is non-air conditioning noise, and the high-frequency noise is air conditioning noise.

6. The system according to claim 5, characterized in that, The low-frequency noise is noise of 30-350Hz; and / or, the high-frequency noise is noise of 350-1000Hz.

7. The system according to claim 6, characterized in that, The target value is 10Db.

8. The system according to claim 4, characterized in that, The second noise reduction strategy includes: the noise reduction processing module uses the original noise signal as a reference signal and the cabin noise signal collected in real time by the cabin noise acquisition module as an error signal, executes an adaptive filtering algorithm, and emits a second anti-phase noise reduction wave to reduce noise through sound field superposition.

9. The system according to claim 8, characterized in that, The noise reduction module includes a processing unit and a speaker unit; The processing unit is used to generate the second anti-phase noise reduction wave; The speaker unit is used to emit the second anti-phase noise reduction wave.

10. The system according to claim 8, characterized in that, The adaptive filtering algorithms include the RLS algorithm, the LMS algorithm, and the FxLMS algorithm.

11. The system according to claim 1, characterized in that, The current driving information includes the current vehicle speed; when the current vehicle speed indicates that the vehicle is in motion, 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.

12. The system according to claim 1 or 11, characterized in that, The first vehicle speed is 80 km / h.

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

14. The system according to claim 13, characterized in that, When the original noise signal does not meet the noise reduction execution conditions, the noise reduction processing module stops the noise reduction process and sends an air conditioning fault warning signal to the vehicle's infotainment system.

15. The system according to claim 13, 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 conditions.

16. The system according to claim 1, characterized in that, The air vent noise acquisition module is installed on the side wall of the air outlet of the vehicle's air conditioning duct. The air conditioning duct outlets include foot-blowing outlets, face-blowing outlets, and defogging outlets.

17. The system according to claim 16, characterized in that, The air vent noise acquisition module includes a MEMS microphone.

18. The system according to claim 1, characterized in that, The noise reduction module includes a speaker unit, which is disposed on the side wall of the air duct outlet of the vehicle's air conditioning system.

19. The system according to claim 18, characterized in that, The loudspeaker unit includes a moving coil loudspeaker, a balanced armature loudspeaker, an electrostatic loudspeaker, and a planar diaphragm loudspeaker.

20. The system according to claim 1, characterized in that, The cabin noise acquisition module is installed in each seat headrest of the vehicle.

21. The system according to claim 1, characterized in that, The cabin noise acquisition module is installed on the roof above each seat of the vehicle.

22. The system according to claim 20 or 21, characterized in that, The cockpit noise acquisition module includes a MEMS microphone.

23. A method for reducing noise in an air conditioner, characterized in that, The method includes: Based on the vehicle's current driving information, a target noise reduction strategy corresponding to the current driving information is executed for noise reduction, so as to adjust the target noise reduction strategy for noise reduction according to the vehicle's current driving information. The target noise reduction strategy includes a first noise reduction strategy or a second noise reduction strategy, and the current driving information includes the current vehicle speed. When the current vehicle speed indicates that the vehicle is stationary, the target noise reduction strategy is the first noise reduction strategy. When the target noise reduction strategy is the first noise reduction strategy, noise reduction is performed based on the original noise signal of the vehicle's air conditioning duct. When the current vehicle speed indicates that the vehicle is in motion, and the current vehicle speed is less than a first vehicle speed, and the cabin noise signal collected in the vehicle's cabin meets the adaptive noise reduction condition based on the difference between the average sound pressure level of low-frequency noise and the average sound pressure level of high-frequency noise and the target value, the target noise reduction strategy is the second noise reduction strategy. When the target noise reduction strategy is the second noise reduction strategy, noise reduction is performed based on the original noise signal and the cabin noise signal. The first vehicle speed is the critical speed at which the main noise in the vehicle is either non-air conditioning noise or air conditioning noise.

24. The method according to claim 23, characterized in that, The first noise reduction strategy includes: Based on the original noise signal, a first anti-phase noise reduction wave with the same frequency and opposite phase as the original noise signal is generated and emitted to reduce noise through sound field superposition.

25. The method according to claim 23, characterized in that, When the difference between the average sound pressure level of the low-frequency noise and the average sound pressure level of the high-frequency noise in the cabin noise signal is less than or equal to the target value, the cabin noise signal satisfies the adaptive noise reduction condition.

26. The method according to claim 23, characterized in that, The second noise reduction strategy includes: Using the original noise signal as a reference signal and the cabin noise signal collected in real time by the cabin noise acquisition module as an error signal, an adaptive filtering algorithm is executed to generate and emit a second anti-phase noise reduction wave, so as to reduce noise through sound field superposition.

27. The method according to claim 23, characterized in that, The method further includes: When the original noise signal exceeds a preset fault noise threshold, the noise reduction process is stopped, and an air conditioning fault warning signal is sent to the vehicle's infotainment system.

28. An electronic device, characterized in that, include: At least one processor and a memory storing a computer program executable on the processor, wherein the processor executes the computer program to perform the air conditioning noise reduction method according to any one of claims 23-27.

29. A non-volatile readable storage medium, characterized in that, The non-volatile readable storage medium stores a computer program, wherein when the computer program is executed by a processor, it performs the air conditioning noise reduction method according to any one of claims 23-27.

30. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the air conditioning noise reduction method according to any one of claims 23-27.

31. A vehicle, characterized in that, The vehicle is equipped with an air conditioning noise reduction system as described in any one of claims 1-22, or is used to perform an air conditioning noise reduction method as described in any one of claims 23-27.

Images