A method and system for non-sensing calibration of secondary passages for an engine active noise reduction system

Abstract

The present invention provides a method and system for non-sensing calibration of a secondary path of an engine active noise reduction system, the method comprising the following steps: obtaining a new secondary path based on sound recognition generated by a multimedia system; comparing the new secondary path with the original secondary path; and selecting the new secondary path or the original secondary path to perform active noise reduction according to the comparison result. Before the system is turned on or when a change in the noise reduction effect of the ENC system is detected, the present invention uses the vehicle-mounted media sound to model the secondary path, and replaces the original secondary path to enhance system stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of noise reduction of new energy vehicles, and in particular relates to a secondary path sensorless calibration method and system for an engine active noise reduction system. Background Art

[0002] With the popularity of new energy vehicles, users are gradually accustomed to a driving environment without engine noise. Therefore, there are more and more complaints about the engine noise of hybrid vehicles. Major OEMs are committed to using the engine active noise control (ENC) method to solve the problem of prominent low-frequency noise of the engine. Compared with the traditional engine noise control method, the ENC method has the advantages of outstanding low-frequency noise reduction effect, flexible control method, low cost, and small space occupation. This method is used in ordinary fuel vehicles, PHEV, and REV vehicles. Its control algorithm is generally through the filtered minimum mean square error (FxLMS) algorithm. The microphone placed near the ceiling collects the error signal e(n), engine speed or vibration signal x(n), superimposes the secondary path transfer function s(z) from the speaker to the target noise reduction point to output the noise reduction signal y(n), and performs sound wave destructive interference on the specific area to achieve the purpose of active noise reduction. The principle diagram of active noise reduction is shown in the figure. Figure 1 shown.

[0003] In the process of implementing the ENC system, factors such as parameter adjustment, delay, and stability of the secondary path are closely related to the noise reduction effect. The adjustment of system parameters can enhance the stability of the system and maintain the noise reduction effect of the system by fine-tuning the step size factor, gain factor, and limiting parameters under different working conditions. The delay of the system can be solved by signal downsampling, computing power optimization, etc. The secondary path is also crucial to the noise reduction effect. The current conventional secondary path identification method uses a speaker to play white noise excitation v(n) to identify the secondary path. The secondary path is then stored in the DSP, and a fixed secondary path pulse response sequence is used during the algorithm iteration process. The principle of secondary path identification using the white noise method is as follows: Figure 2 However, in the actual vehicle application environment, due to the changes in the cabin sound field, number of passengers, season, space, seat position and other factors, the actual secondary path s(z) is inconsistent with that stored in the DSP, resulting in the attenuation of the ENC noise reduction effect.

[0004] However, the above problem is solved by the secondary path online identification method. However, during the online modeling process, the volume of the white noise emitted is high and the convergence speed is slow, which easily causes user complaints. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of the above-mentioned background technology and to provide a method and system for non-sensing calibration of the secondary pathway of an engine active noise reduction system. Before the system is turned on or when a change in the noise reduction effect of the ENC system is detected, the secondary pathway is modeled with the help of vehicle-mounted media sound, and the original secondary pathway is replaced to enhance system stability.

[0006] The technical solution adopted by the present invention is: a secondary path non-sensing calibration method for an engine active noise reduction system, comprising the following steps:

[0007] New secondary pathways are obtained based on the recognition of sounds generated by multimedia systems;

[0008] Compare the new secondary pathway to the original secondary pathway;

[0009] A new secondary path or the original secondary path is selected to perform active noise reduction according to the comparison result.

[0010] In the above technical solution, the sound generated by the multimedia system is vehicle startup music, media sound selected by the user, or embedded music of the engine active noise control system.

[0011] In the above technical solution, the secondary path sensorless calibration method for the engine active noise reduction system is executed after the engine active noise control system is turned on.

[0012] In the above technical solution, the process of obtaining a new secondary path based on the sound recognition generated by the multimedia system includes:

[0013] Identify the memory status of the engine active noise control system;

[0014] If the engine active noise control system memory state is turned on, when the vehicle startup music is played, a new secondary path is obtained through the vehicle startup music recognition;

[0015] If the engine active noise control system memory state is off and an external input active noise reduction command is received and the multimedia system is playing a media sound selected by the user, a new secondary path is obtained by identifying the media sound selected by the user;

[0016] If the memory state of the engine active noise control system is turned off and an active noise reduction command is received from external input and the multimedia system does not play the media sound selected by the user, the embedded music of the engine active noise control system is played, and a new secondary path is obtained through the embedded music recognition of the engine active noise control system.

[0017] The above technical solution also includes the following steps: during the execution of active noise reduction, if the noise reduction effect does not meet the preset standard, the active noise reduction process is stopped; preferably, a new secondary path is obtained by identifying the media sound selected by the user; if the multimedia system does not play the media sound selected by the user or the media sound does not contain the frequency required for noise reduction, a new secondary path is obtained by identifying the embedded music of the engine active noise control system; the new secondary path is compared with the original secondary path; and according to the comparison result, the new secondary path or the original secondary path is selected to perform active noise reduction.

[0018] In the above technical solution, the process of selecting a new secondary pathway or the original secondary pathway to perform active noise reduction based on the comparison result between the new secondary pathway and the original secondary pathway includes: if the deviation ratio of the specified parameters of the new secondary pathway and the original secondary pathway is greater than the set value, the new secondary pathway is used to perform active noise reduction; otherwise, the original secondary pathway is used to perform active noise reduction.

[0019] In the above technical solution, if the secondary path sensorless calibration method for the engine active noise reduction system is used for an extended-range vehicle, the embedded music of the engine active noise control system is designed based on the 2nd, 4th, and 6th order frequencies of the engine under all constant speed conditions.

[0020] The present invention also provides a secondary path sensorless calibration system for an engine active noise reduction system, which is used to implement the secondary path sensorless calibration method for an engine active noise reduction system described in the above technical solution, comprising: a multimedia system, a secondary path identification module, and an active noise reduction module;

[0021] The multimedia system is used to play sounds based on external commands and the engine active noise control system memory status;

[0022] The secondary pathway generation module is used to obtain a new secondary pathway based on the sound recognition generated by the multimedia system; and compare the new secondary pathway with the original secondary pathway;

[0023] The active noise reduction module is used to select a new secondary path or an original secondary path to perform active noise reduction according to the comparison result.

[0024] The present invention also provides a vehicle, comprising:

[0025] one or more processors;

[0026] A memory for storing one or more programs;

[0027] When the one or more programs are executed by the one or more processors, the one or more processors implement the secondary path sensorless calibration method for an engine active noise reduction system as described in the above technical solution.

[0028] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the secondary path sensorless calibration method for an engine active noise reduction system as described in the above technical solution.

[0029] The beneficial effect of the present invention is that the system noise increases due to the sudden change of the secondary path during the operation of the ENC system. Therefore, the present invention provides a method for non-sensing calibration of the secondary path to enhance the stability of the engine active noise reduction system. Through software logic judgment, before the system is started or when the noise reduction effect of the ENC system is detected to change, the secondary path identification module is called, and the vehicle media music or the built-in music of the ENC system is used to model the secondary path, and the original secondary path is replaced, so as to enhance the stability of the system. Since the audio used for secondary path identification is mainly media sound, the present invention is not easy to detect and will not cause complaints from passengers. Therefore, compared with the traditional white noise method, the calibration of the secondary path of the ENC system belongs to "non-sensing" calibration.

[0030] Furthermore, the present invention can more flexibly select adaptive sound sources by specifying that the sound generated by the multimedia system is the vehicle startup music, the media sound selected by the user, or the embedded music of the engine active noise control system. This provides more options for the system, improves the adaptability of the system in different scenarios, and does not limit the system to use only a single type of sound. Diversified sound sources help the system adapt to different usage environments and needs, thereby optimizing the noise reduction effect.

[0031] Furthermore, the present invention specifies that the secondary path non-sensing calibration method is performed after the engine active noise control system is turned on, ensuring that the noise reduction system can be effectively calibrated at startup to adapt to the current working state. This requirement helps the system to adjust and optimize the working parameters in time when it is first turned on, thereby better ensuring the noise reduction effect and avoiding the impact of system performance due to parameter mismatch during the startup phase.

[0032] Furthermore, the present invention distinguishes in detail the different situations of the memory state of the engine active noise control system and the external input command, and the method can flexibly calibrate in different operating modes. For example, the vehicle startup music is used for calibration when the vehicle is turned on, and the media sound or embedded music selected by the user is used for calibration when the system is turned off. This flexibility ensures that the system can efficiently complete the calibration and obtain the best noise reduction effect in different working states.

[0033] Furthermore, the present invention adds a function of "stopping active noise reduction if the noise reduction effect does not meet the preset standard" to prevent the system from continuing to work when it cannot effectively reduce noise, thereby reducing the negative impact of the ineffective noise reduction process on the user experience. In addition, the calibration is preferably performed through the media sound selected by the user, so that the noise reduction effect can be optimized according to the user's personalized needs. This step helps to improve the stability and reliability of the noise reduction system and avoid unnecessary noise reduction errors or system losses.

[0034] Furthermore, the present invention can more accurately determine when to use a new secondary path or retain the original path by setting the "specified parameter deviation ratio of the new and old secondary paths" as the selection criterion. This method has a higher judgment standard and can optimize the noise reduction effect based on the actual parameter difference rather than pure intuition or simple judgment, thereby improving the accuracy of the system and the stability of the noise reduction effect.

[0035] Furthermore, the present invention optimizes the active noise control system by inserting music based on different engine speeds and frequencies (such as 2nd, 4th, and 6th order frequencies) in response to the special needs of the extended-range vehicle. This targeted design enables the system to be finely adjusted according to the specific working state of the extended-range vehicle, improving the noise reduction effect and adaptability of the extended-range vehicle, especially the noise reduction effect in specific frequency bands. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is the principle diagram of active noise reduction;

[0037] Figure 2 This is the schematic diagram of secondary path identification using the white noise method.

[0038] Figure 3 It is a schematic diagram of the method flow of the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0040] Example 1

[0041] like Figure 3 As shown, the present invention provides a secondary path non-sensing calibration method for an engine active noise reduction system, comprising the following steps:

[0042] New secondary pathways are obtained based on the recognition of sounds generated by multimedia systems;

[0043] Compare the new secondary pathway to the original secondary pathway;

[0044] A new secondary path or the original secondary path is selected to perform active noise reduction according to the comparison result.

[0045] Specifically, the principle of obtaining a new secondary path based on the sound recognition generated by the multimedia system in the present invention is the same as the secondary path recognition principle of the white noise method, and the sound generated by the multimedia system is used to replace the white noise to obtain the secondary path.

[0046] Specifically, the sound generated by the multimedia system is vehicle startup music, media sound selected by a user, or music embedded in an engine active noise control system.

[0047] Although multimedia sound has specific frequency characteristics and is not as rich in frequency components as white noise, for extended-range vehicles, the range extender needs to work at a specific speed. At this time, the frequency component of the engine noise is fixed. Before applying the above method flow, the spectrum analysis of the vehicle startup music can be performed separately to confirm whether it contains the frequencies required by the vehicle range extender. If these frequencies are included, the startup music can be used when secondary path identification is required. If the startup music does not fully include the required frequency information, the startup music can be redesigned to cleverly integrate the missing frequencies into the startup music.

[0048] When using the media sound selected by the user for secondary channel identification, it is necessary to confirm in advance whether it contains the key frequency components required by the vehicle. If the multimedia sound does not contain the key frequency components, the built-in music should be played for secondary channel identification.

[0049] The method of using the sound generated by the multimedia system to identify the secondary path is the same as the white noise method in the conventional technical means. However, before using the sound generated by the multimedia system to identify, it is necessary to first confirm whether the key frequency is included. Here, the speaker group required to play must include the speaker of the active noise reduction system.

[0050] It should be noted that the vehicle is usually turned on in a relatively quiet environment. When multimedia music is playing, there may be environmental interference. If the noise of environmental interference does not contain the critical frequency of the REV vehicle range extender, it will not affect the accuracy of secondary channel recognition. If the interference is of the same critical frequency, it will only affect the amplitude of the secondary channel, and the amplitude deviation will have little effect on the active noise reduction effect.

[0051] Specifically, the secondary passage sensorless calibration method for the engine active noise reduction system is executed after the engine active noise control system is turned on.

[0052] Specifically, the process of obtaining a new secondary path based on the sound recognition generated by the multimedia system includes:

[0053] Identify the memory status of the engine active noise control system; the memory status refers to the historical working status of the engine active noise control system. Generally, the vehicle will remember the status of the active noise control system when it was last started;

[0054] If the engine active noise control system memory state is turned on, when the vehicle startup music is played, a new secondary path is obtained through the vehicle startup music recognition;

[0055] If the engine active noise control system memory state is off and an external input active noise reduction command is received and the multimedia system is playing a media sound selected by the user, a new secondary path is obtained by identifying the media sound selected by the user;

[0056] If the memory state of the engine active noise control system is turned off and an active noise reduction command is received from external input and the multimedia system does not play the media sound selected by the user, the embedded music of the engine active noise control system is played, and a new secondary path is obtained through the embedded music recognition of the engine active noise control system.

[0057] Specifically, the following steps are also included: during the execution of active noise reduction, if the noise reduction effect does not reach the preset standard, the active noise reduction process is stopped; the preset standard of the noise reduction effect is that the signal received by the error microphone does not reach the set amplitude upper limit. The active noise reduction system will set an amplitude upper limit for the signal received by the error microphone. When the engine and the corresponding active noise reduction system work, the signal received by the error microphone will generally be within a certain range. This amplitude is related to the engine working conditions and the noise reduction effect of the active noise reduction system. It is generally not fixed, and the amplitude upper limit of this parameter is determined through actual vehicle testing. If the signal received by the error microphone is higher than the set amplitude upper limit when the active noise reduction system is turned on, it is considered that it has been greatly interfered or the secondary path has undergone a large change. Therefore, it is necessary to stop the normal operation of the active noise reduction system, re-identify the secondary path and compare it with the original secondary path. If it is the same as the original secondary path, it means that there is external interference here. If it is different from the original secondary path, it means that the secondary path has changed and needs to be updated.

[0058] Preferably, a new secondary pathway is obtained by identifying the media sound selected by the user; if the multimedia system does not play the media sound selected by the user or the media sound does not contain the frequency required for noise reduction, a new secondary pathway is obtained by identifying the embedded music of the engine active noise control system; the new secondary pathway is compared with the original secondary pathway; and the new secondary pathway or the original secondary pathway is selected to perform active noise reduction based on the comparison result.

[0059] Specifically, the process of selecting a new secondary pathway or the original secondary pathway to perform active noise reduction based on the comparison result between the new secondary pathway and the original secondary pathway includes: if the deviation ratio of the specified parameters of the new secondary pathway and the original secondary pathway is greater than the set value, the new secondary pathway is used to perform active noise reduction; otherwise, the original secondary pathway is used to perform active noise reduction.

[0060] There are two key parameters for the secondary path: amplitude and phase. The amplitude deviation has a smaller impact, while the phase deviation has a greater impact. If the phase difference is greater than 30 degrees, it is unacceptable. Therefore, if the phase difference between the new secondary path and the original secondary path is greater than the set 30 degrees, the new secondary path is used to perform active noise reduction.

[0061] Specifically, if the secondary path sensorless calibration method for the engine active noise reduction system is used for an extended-range vehicle, the embedded music of the engine active noise control system is designed based on the 2nd, 4th, and 6th order frequencies of the engine under all constant speed conditions.

[0062] The embedded music is an audio sample designed based on the frequency of the REV range extender, combined with the frequency band of musical instruments and music theory. If it is a different type of vehicle, the key frequency can be extracted by simply confirming the operating speed of the range extender, and then the embedded music for identifying the secondary path can be designed. The embedded music needs to include the above-mentioned key frequencies when the corresponding vehicle type is working to meet the needs of different vehicles.

[0063] Example 2

[0064] The present invention also provides a secondary path sensorless calibration system for an engine active noise reduction system, which is used to implement the secondary path sensorless calibration method for an engine active noise reduction system described in the above technical solution, comprising: a multimedia system, a secondary path identification module, and an active noise reduction module;

[0065] The multimedia system is used to play sounds based on external commands and the engine active noise control system memory status;

[0066] The secondary path identification module is used to obtain a new secondary path based on the sound recognition generated by the multimedia system; and compare the new secondary path with the original secondary path;

[0067] The active noise reduction module is used to select a new secondary path or an original secondary path to perform active noise reduction according to the comparison result.

[0068] like Figure 3 As shown, this embodiment specifically includes the following steps:

[0069] 1. Before turning on the car computer, the ENC system (Engine Active Noise Control System) memory start status is detected. If the memory status is on, when the car computer is turned on and music is played, the secondary path identification module is called to identify the secondary path, and the secondary path identified this time is compared with the secondary path saved in the DSP. If the difference is not big, it will not be replaced; if the difference is big, it will be replaced with the latest identified secondary path. After the ENC system is turned on, it will enter the noise reduction mode normally;

[0070] 2. Before turning on the car computer, check the ENC system memory on status. If the memory status is off and the ENC system switch interface inputs the command to turn on the active noise reduction, check whether the multimedia is playing music. If it is detected that media music is playing, call the secondary path identification module, compare and determine whether to replace the secondary path after identification, and then enter the noise reduction mode;

[0071] 3. Before turning on the car machine, the ENC system memory on status is detected. If the memory status is off and the ENC system switch interface inputs the command to turn on the active noise reduction, it detects whether the multimedia is playing music. If no multimedia music is detected, the music calibration ENC system tab pops up, plays the music implanted by the ENC system, calls the secondary path module, compares and determines whether to replace the secondary path after identification, and then enters the noise reduction mode;

[0072] 4. After the active noise reduction module is turned on, if instability occurs, the active noise reduction module is stopped and the multimedia is detected to see if it is playing music. If no multimedia music is detected, the music calibration ENC system tab pops up to play the music implanted by the ENC system. The secondary path is called by the module, and after identification, it is compared to determine whether to replace the secondary path, and then enter the noise reduction mode;

[0073] 5. The music implanted in the ENC system mentioned in 3 and 4 needs to be designed based on the vehicle engine access strategy. Specifically, if ENC is applied to the extended-range vehicle (REV), the range extender often works under constant speed conditions. The 2nd, 4th, and 6th order frequencies of the engine under all constant speed conditions are extracted, and the designed music can be designed based on all order frequencies of the extended-range condition;

[0074] Through the above five steps of judgment and execution, during the operation of the ENC system, with the help of the car startup music, the car media sound and the music built into the ENC system, the secondary path can be calibrated seamlessly at all times to enhance the system stability.

[0075] Example 3

[0076] The present invention also provides a vehicle, comprising:

[0077] one or more processors;

[0078] A memory for storing one or more programs;

[0079] When the one or more programs are executed by the one or more processors, the one or more processors implement the secondary path sensorless calibration method for an engine active noise reduction system as described in the above technical solution.

[0080] Example 4

[0081] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the secondary path sensorless calibration method for an engine active noise reduction system as described in the above technical solution.

[0082] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may 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.

[0083] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0084] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0085] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0086] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

[0087] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A method for non-sensing calibration of secondary path of an engine active noise reduction system, characterized in that: The following steps are involved: New secondary pathways are obtained based on the recognition of sounds generated by multimedia systems; Compare the new secondary pathway to the original secondary pathway; A new secondary path or the original secondary path is selected to perform active noise reduction according to the comparison result.

2. A method according to claim 1, characterized in that: The sound generated by the multimedia system is vehicle startup music, media sound selected by the user, or music inserted into the engine active noise control system.

3. A method according to claim 2, characterized in that: The secondary passage sensorless calibration method for the engine active noise reduction system is performed after the engine active noise control system is turned on.

4. A method according to claim 1, characterized in that: The process of obtaining new secondary pathways based on the sound recognition generated by the multimedia system includes: Identify the memory status of the engine active noise control system; If the engine active noise control system memory state is turned on, when the vehicle startup music is played, a new secondary path is obtained through the vehicle startup music recognition; If the engine active noise control system memory state is off and an external input active noise reduction command is received and the multimedia system is playing a media sound selected by the user, a new secondary path is obtained by identifying the media sound selected by the user; If the memory state of the engine active noise control system is turned off and an active noise reduction command is received from external input and the multimedia system does not play the media sound selected by the user, the embedded music of the engine active noise control system is played, and a new secondary path is obtained through the embedded music recognition of the engine active noise control system.

5. A method according to claim 1, characterized in that: The following steps are also included: During the active noise reduction process, if the noise reduction effect does not meet the preset standard, the active noise reduction process is stopped; preferably, a new secondary path is obtained by identifying the media sound selected by the user; if the multimedia system does not play the media sound selected by the user or the media sound does not contain the frequency required for noise reduction, a new secondary path is obtained by identifying the embedded music of the engine active noise control system; the new secondary path is compared with the original secondary path; and the new secondary path or the original secondary path is selected according to the comparison result to perform active noise reduction.

6. A method according to claim 5, characterized in that: The process of selecting a new secondary pathway or an original secondary pathway to perform active noise reduction according to the comparison result between the new secondary pathway and the original secondary pathway includes: if the deviation ratio of the specified parameters of the new secondary pathway and the original secondary pathway is greater than the set value, the new secondary pathway is used to perform active noise reduction; otherwise, the original secondary pathway is used to perform active noise reduction.

7. A method according to claim 1, characterized in that: If the secondary path sensorless calibration method for the engine active noise reduction system is used for an extended-range vehicle, the embedded music of the engine active noise control system is designed based on the 2nd, 4th, and 6th order frequencies of the engine under all constant speed conditions.

8. A secondary path sensorless calibration system for an engine active noise reduction system, characterized in that: A method for realizing a secondary passage sensorless calibration for an engine active noise reduction system according to any one of claims 1 to 8, comprising: a multimedia system, a secondary passage identification module, and an active noise reduction module; The multimedia system is used to play sounds based on external commands and the engine active noise control system memory status; The secondary pathway generation module is used to obtain a new secondary pathway based on the sound recognition generated by the multimedia system; and compare the new secondary pathway with the original secondary pathway; The active noise reduction module is used to select a new secondary path or an original secondary path to perform active noise reduction according to the comparison result.

9. A vehicle, characterized in that: The vehicle comprises: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the secondary path sensorless calibration method for an engine active noise reduction system as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the secondary path sensorless calibration method for an engine active noise reduction system according to any one of claims 1 to 7 is implemented.

Images