Exhaust noise control method, system, device, controller and storage medium

Abstract

The application provides an exhaust noise control method, system, device, controller and storage medium, and relates to the technical field of automobiles. By responding to the operation of a user starting any driving mode, the second exhaust pipeline and the third exhaust pipeline in the exhaust noise control system can be controlled to be in a connected or disconnected state, and the length of at least one exhaust pipeline in the first exhaust pipeline, the second exhaust pipeline and the third exhaust pipeline is adjusted. Not only can the exhaust noise be eliminated, but also the exhaust noise can be amplified, so that the diversified needs of users for the NVH performance of the vehicle can be met.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and in particular to an exhaust noise control method, system, device, controller, and storage medium. Background Technology

[0002] With the continuous development of vehicle NVH (noise, vibration, harshness) technology, users have begun to have diverse needs regarding vehicle NVH performance. Some users want to eliminate exhaust noise, while others want to amplify exhaust noise to enhance the vehicle's sense of power.

[0003] Meeting users' diverse needs for vehicle NVH performance is an urgent problem to be solved. Summary of the Invention

[0004] To address the problems in the prior art, embodiments of this application provide an exhaust noise control method, system, device, controller, and storage medium that can meet users' diverse needs for vehicle NVH performance.

[0005] In a first aspect, embodiments of this application provide an exhaust noise control method, applied to a controller in an exhaust noise control system, the exhaust noise control system including a first exhaust pipe, a second exhaust pipe, and a third exhaust pipe, the method comprising:

[0006] In response to the user activating any driving mode, the second exhaust pipe and the third exhaust pipe are controlled to be connected or disconnected; the driving modes include quiet driving mode and dynamic driving mode;

[0007] Based on the driving mode activated by the user, the length of at least one of the first exhaust pipe, the second exhaust pipe, and the third exhaust pipe is adjusted.

[0008] In one possible implementation, controlling the second exhaust pipe and the third exhaust pipe to be in a connected or disconnected state in response to the user activating any driving mode includes:

[0009] If the user activates the quiet driving mode, then the second exhaust pipe and the third exhaust pipe will be disconnected.

[0010] If the user activates the power driving mode, the second exhaust pipe is controlled to be disconnected and the third exhaust pipe is controlled to be connected; or, the second exhaust pipe is controlled to be connected and the third exhaust pipe is controlled to be disconnected.

[0011] In a possible implementation, the adjusting the length of at least one of the first exhaust pipe, the second exhaust pipe and the third exhaust pipe based on the user-activated driving mode comprises:

[0012] If the user-activated driving mode is the quiet driving mode, the length of the second exhaust pipe and the third exhaust pipe is adjusted according to the temperature of the first exhaust pipe and the engine speed;

[0013] If the user-activated driving mode is the power driving mode, the length of the first exhaust pipe and the target exhaust pipe is adjusted according to the temperature of the first exhaust pipe and the engine speed; the target exhaust pipe is the exhaust pipe in the communication state between the second exhaust pipe and the third exhaust pipe.

[0014] In a possible implementation, the adjusting the length of the second exhaust pipe and the third exhaust pipe according to the temperature of the first exhaust pipe and the engine speed comprises:

[0015] determining the sound speed of the first target noise according to the temperature of the first exhaust pipe;

[0016] determining the frequency of the first target noise according to the engine speed;

[0017] determining the target length of the second exhaust pipe and the target length of the third exhaust pipe according to the sound speed of the first target noise and the frequency of the first target noise;

[0018] adjusting the length of the second exhaust pipe according to the target length of the second exhaust pipe and adjusting the length of the third exhaust pipe according to the target length of the third exhaust pipe.

[0019] In a possible implementation, the adjusting the length of the first exhaust pipe and the target exhaust pipe according to the temperature of the first exhaust pipe and the engine speed comprises:

[0020] determining the sound speed of the second target noise according to the temperature of the first exhaust pipe;

[0021] determining the frequency of the second target noise according to the engine speed;

[0022] determining the target length of the first exhaust pipe and the target length of the target exhaust pipe according to the sound speed of the second target noise and the frequency of the second target noise;

[0023] Adjust the length of the first exhaust pipeline according to the target length of the first exhaust pipeline, and adjust the length of the target exhaust pipeline according to the target length of the target exhaust pipeline.

[0024] In a possible implementation, the determining the frequency of the second target noise according to the rotating speed of the engine comprises:

[0025] Determining the harmonic order corresponding to the frequency of the second target noise according to the rotating speed interval to which the rotating speed of the engine belongs and the pre-stored correspondence between the rotating speed interval and the set harmonic order.

[0026] In a second aspect, an embodiment of the present application provides an exhaust noise control system, which comprises a controller, a first exhaust pipeline, a second exhaust pipeline and a third exhaust pipeline; the controller is configured to:

[0027] In response to an operation of the user starting any driving mode, the controller controls the second exhaust pipeline and the third exhaust pipeline to be in a connected or disconnected state; the driving mode comprises a quiet driving mode and a power driving mode.

[0028] The controller adjusts the length of at least one of the first exhaust pipeline, the second exhaust pipeline and the third exhaust pipeline based on the driving mode started by the user.

[0029] In a third aspect, an embodiment of the present application provides an exhaust noise control device, which comprises:

[0030] A response unit is configured to, in response to an operation of the user starting any driving mode, control the second exhaust pipeline and the third exhaust pipeline to be in a connected or disconnected state; the driving mode comprises a quiet driving mode and a power driving mode.

[0031] An adjustment unit is configured to adjust the length of at least one of the first exhaust pipeline, the second exhaust pipeline and the third exhaust pipeline based on the driving mode started by the user.

[0032] In a fourth aspect, an embodiment of the present application provides a controller, which comprises a memory and a processor, and the memory stores a computer program capable of running on the processor; when the computer program is executed by the processor, the method in any one of the first aspect is implemented.

[0033] In a fifth aspect, an embodiment of the present application provides a computer readable storage medium, which stores a computer program; when the computer program is executed by a processor, the method in any one of the first aspect is implemented.

[0034] The exhaust noise control method, system, device, controller and storage medium provided by the embodiment of the application can control the second exhaust pipeline and the third exhaust pipeline in the exhaust noise control system to be in a connected or disconnected state, and adjust the length of at least one of the first exhaust pipeline, the second exhaust pipeline and the third exhaust pipeline, so as to not only eliminate exhaust noise, but also amplify exhaust noise, thereby meeting the diversified needs of users for vehicle NVH performance. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0036] Figure 1 A structural schematic diagram of an exhaust noise control system provided by the embodiment of the application is provided.

[0037] Figure 2 A flowchart of an exhaust noise control method provided by the embodiment of the application is provided.

[0038] Figure 3 A schematic diagram of a post-processing transmission loss curve provided by the embodiment of the application is provided.

[0039] Figure 4 A schematic diagram of an exhaust noise control system transmission loss curve in a quiet driving mode provided by the embodiment of the application is provided.

[0040] Figure 5 A schematic diagram of a correspondence between a rotational speed interval and a set harmonic order provided by the embodiment of the application is provided.

[0041] Figure 6 A structural schematic diagram of an exhaust noise control device provided by the embodiment of the application is provided.

[0042] Figure 7 A structural schematic diagram of a controller provided by the embodiment of the application is provided. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the application more clear, the application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only some embodiments of the application, not all embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0044] It should be noted that the terms "comprising" and "having" and their variations, involved in the document of the present application, are intended to cover the non-exclusive inclusion, for example, the process, method, system, product or device containing a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] With the continuous development of vehicle NVH (noise, vibration, harshness) technology, users have diversified demands for the NVH performance of vehicles. Users who pursue a quiet driving environment have the demand for eliminating exhaust noise for vehicles, and users who pursue the driving power of vehicles have the demand for amplifying exhaust noise for vehicles to improve the tailpipe roar and roar.

[0046] Based on this, the exhaust noise control system provided by the embodiments of the present application can control the second exhaust pipe and the third exhaust pipe to be in a connected or disconnected state, and adjust the length of at least one of the first exhaust pipe, the second exhaust pipe and the third exhaust pipe, so as to not only eliminate exhaust noise, but also amplify exhaust noise, thereby meeting the diversified demands of users for the NVH performance of vehicles.

[0047] First, a kind of exhaust noise control system provided by the embodiments of the present application is introduced below.

[0048] The embodiments of the present application provide an exhaust noise control system, as shown in Figure 1 The exhaust noise control system 100 includes a first exhaust pipe 101, a second exhaust pipe 102, a third exhaust pipe 103, a temperature sensor 104, a sound attenuation cavity 105, a first flow control valve 106, a second flow control valve 107, a third flow control valve 108, a first volume cavity 109, a second volume cavity 110, a third volume cavity 111, a first control valve 112, a second control valve 113, a first tailpipe 114, a second tailpipe 115, a third tailpipe 116, an air compressor 117 and a controller 118.

[0049] The first exhaust pipeline 101 is in communication with the aftertreatment device. The first exhaust pipeline 101 is provided with at least one perforation and a first volume cavity 109. The at least one perforation is used to dissipate high-frequency airflow noise in the exhaust noise control system, and the number of perforations of the first exhaust pipeline 101 can be determined according to the perforation rate. Exemplarily, the perforation rate can be greater than 30%. The first volume cavity 109 is in communication with the air compressor 117 through a first gas taking pipeline provided with a first flow control valve 106, and the first volume cavity 109 is provided with a first elastic member connected to a first tail pipe 114 at the lower end of the first volume cavity 109.

[0050] The second exhaust pipeline 102 is a branch exhaust pipeline of the first exhaust pipeline 101. The second exhaust pipeline 102 is provided with a second volume cavity 110, which is in communication with the air compressor 117 through a second gas taking pipeline provided with a second flow control valve 107, and the second volume cavity 110 is provided with a second elastic member connected to a second tail pipe 115 at the lower end of the second volume cavity 110. The second tail pipe 115 is provided with a first control valve 112 for controlling the second exhaust pipeline 115 to be in communication or disconnected.

[0051] The third exhaust pipeline 103 is another branch exhaust pipeline of the first exhaust pipeline 101. The third exhaust pipeline 103 is provided with a third volume cavity 111, which is in communication with the air compressor 117 through a third gas taking pipeline provided with a third flow control valve 108, and the third volume cavity 111 is provided with a third elastic member connected to a third tail pipe 116 at the lower end of the third volume cavity 111. The third tail pipe 116 is provided with a second control valve 113 for controlling the third exhaust pipeline 116 to be in communication or disconnected.

[0052] The temperature sensor 104 is arranged on the first exhaust pipeline to monitor the temperature in the first exhaust pipeline.

[0053] The sound-absorbing cavity 105 is arranged adjacent to the first exhaust pipeline, the second exhaust pipeline and the third exhaust pipeline. The sound-absorbing cavity 105 is filled with sound-absorbing material, for example, sound-absorbing cotton, which is used to eliminate high-frequency airflow noise in the exhaust noise control system.

[0054] The first flow control valve 106 is arranged in the first gas taking pipeline. The first flow control valve 106 is used to control the gas pressure in the first volume cavity 109, so that the first elastic member is elastically deformed to drive the first tail pipe to stretch and contract. Exemplarily, the first elastic member can be a spring.

[0055] A second flow control valve 107 is arranged in the second gas taking line. The second flow control valve 107 is used to control the gas pressure in the second volume chamber 110, so that the second elastic member is elastically deformed to drive the second tail pipe to extend or retract.

[0056] A third flow control valve 108 is arranged in the third gas taking line. The third flow control valve 108 is used to control the gas pressure in the third volume chamber 111, so that the third elastic member is elastically deformed to drive the third tail pipe to extend or retract.

[0057] The first volume chamber 109 is a closed volume chamber, and the internal gas source is from the air compressor 117. The first volume chamber 109 is arranged in the first exhaust line, and is in communication with the air compressor 117 through the first gas taking line. The first volume chamber 109 is internally provided with a first elastic member.

[0058] The second volume chamber 110 is a closed volume chamber, and the internal gas source is from the air compressor 117. The second volume chamber 109 is arranged in the second exhaust line, and is in communication with the air compressor 117 through the second gas taking line. The second volume chamber 110 is internally provided with a second elastic member.

[0059] The third volume chamber 111 is a closed volume chamber, and the internal gas source is from the air compressor 117. The third volume chamber is arranged in the third exhaust line, and is in communication with the air compressor 117 through the third gas taking line. The third volume chamber 111 is internally provided with a third elastic member.

[0060] The first control valve 112 is arranged in the second exhaust line, and is used to control the second exhaust line 115 to be in a communication state or a disconnected state. Exemplarily, the first control valve can be an electromagnetic valve.

[0061] The second control valve 113 is arranged in the third exhaust line, and is used to control the third exhaust line 116 to be in a communication state or a disconnected state.

[0062] The first tail pipe 114 is arranged at the lower end of the first volume chamber 109, and is a telescopic exhaust tail pipe.

[0063] The second tail pipe 115 is arranged at the lower end of the second volume chamber 110, and is another telescopic exhaust tail pipe.

[0064] The third tail pipe 116 is arranged at the lower end of the third volume chamber 111, and is another telescopic exhaust tail pipe.

[0065] The air compressor 117 is in communication with the first flow control valve 106, the second flow control valve 107 and the third flow control valve 108 through the first gas taking pipeline, the second gas taking pipeline and the third gas taking pipeline, respectively, for controlling the gas pressure in the first volume cavity 109 to make the first elastic member elastically deform to drive the first tail pipe to stretch and retract, and / or controlling the gas pressure in the second volume cavity 110 to make the second elastic member elastically deform to drive the second tail pipe to stretch and retract, and / or controlling the gas pressure in the third volume cavity 111 to make the third elastic member elastically deform to drive the third tail pipe to stretch and retract.

[0066] The controller 118 is the control center of the vehicle and is connected with each part of the vehicle through a bus. The controller 118 is used to control the second exhaust pipeline 102 and the third exhaust pipeline 103 to be in communication or disconnection by controlling the first control valve 112 and the second control valve 113 to be in the open or closed state. The controller 118 is also used to adjust the lengths of the first exhaust pipeline 101, the second exhaust pipeline 102 and the third exhaust pipeline 103. The step of adjusting the lengths of the first exhaust pipeline 101, the second exhaust pipeline 102 and the third exhaust pipeline 103 will be described in detail below. In an alternative embodiment, the controller 118 can be an ECU (Electronic Control Unit).

[0067] Figure 2 A flow chart of an exhaust noise control method provided by an embodiment of the application is shown. The method can be applied to Figure 1 The controller in the exhaust noise control system shown is, for example Figure 2 The exhaust noise control method shown can include the following steps:

[0068] Step S201, in response to the user's operation of starting any driving mode, the second exhaust pipeline and the third exhaust pipeline are controlled to be in communication or disconnection.

[0069] The driving mode includes a quiet driving mode and a power driving mode.

[0070] Different drivers have different requirements for the performance of the vehicle NVH. For example, some drivers prefer a quiet driving environment during vehicle driving, while other drivers pay more attention to the performance of the vehicle power during vehicle driving. In addition, even the same driver has different expectations for the vehicle NVH performance in different use scenarios. For example, when there is no other passenger in the vehicle, the driver drives the vehicle alone during the driving process, some drivers may pay more attention to how to improve the vehicle power, and these drivers expect the vehicle tailpipe to emit a roaring sound during vehicle acceleration to improve acoustic comfort. However, when there are other passengers in the vehicle, especially when there are old people and children in the vehicle, in order to avoid disturbing the passengers in the vehicle, at this time, these drivers may expect the vehicle to create a quieter driving environment.

[0071] Based on the different requirements of different drivers for the vehicle NVH performance, the exhaust noise control method provided by the embodiments of the present application provides a quiet driving mode and a power driving mode, and the vehicle driver can select the corresponding driving mode according to the actual use requirement.

[0072] In an optional embodiment, the driver can select to turn on the quiet driving mode. For example, the driver can turn on the quiet driving mode through the control button of the quiet driving mode provided in the vehicle. Alternatively, the driver can also turn on the quiet driving mode by voice. The application does not make any limitation on the way of turning on the quiet driving mode.

[0073] When the controller of the vehicle determines that the driving mode selected by the driver is the quiet driving mode, the first control valve and the second control valve can be controlled to be in an open state. When the first control valve and the second control valve are in the open state, the second exhaust pipeline and the third exhaust pipeline are in a disconnected state.

[0074] At this time, when the first control valve and the second control valve are in the open state, and the second exhaust pipeline and the third exhaust pipeline are in the disconnected state, the second exhaust pipeline and the third exhaust pipeline serve as 1 / 4 wavelength tubes. That is, the exhaust noise in the second exhaust pipeline is reflected at the position of the first control valve, and the exhaust noise in the third exhaust pipeline is reflected at the position of the second control valve, and the reflected exhaust noise leaves the second exhaust pipeline and the third exhaust pipeline, and returns to the first exhaust pipeline to cancel the standing wave in the first exhaust pipeline, so as to eliminate the exhaust noise.

[0075] In another optional embodiment, the driver can select to turn on the power driving mode. For example, the driver can turn on the power driving mode through the control button of the power driving mode provided in the vehicle. Alternatively, the driver can also turn on the power driving mode by voice. The application does not make any limitation on the way of turning on the power driving mode.

[0076] When the vehicle controller determines that the user has activated the power driving mode, it can control the first control valve to be in the open state and the second control valve to be in the closed state, thereby disconnecting the second exhaust pipe and connecting the third exhaust pipe; or, it can control the first control valve to be in the closed state and the second control valve to be in the open state, thereby connecting the second exhaust pipe and disconnecting the third exhaust pipe.

[0077] At this point, the exhaust pipes in the second and third exhaust pipes that are currently disconnected continue to function as quarter-wavelength tubes, reflecting exhaust noise. Assuming the third exhaust pipe is disconnected, the exhaust noise in the third exhaust pipe will be reflected at the second control valve location, leaving the third exhaust pipe and returning to the first and second exhaust pipes. When the reflected exhaust noise and the exhaust noise in the first and second exhaust pipes have the same amplitude but opposite phase at a specific frequency, sound wave interference will occur. When this specific frequency couples with the exhaust order frequency, the exhaust noise will be amplified. Here, the specific frequency is the standing wave frequency.

[0078] Step S202: Based on the driving mode activated by the user, adjust the length of at least one of the first exhaust pipe, the second exhaust pipe, and the third exhaust pipe.

[0079] Because of the fixed exhaust pipe length, the frequency range of exhaust noise that can be eliminated is small in quiet driving mode, and the frequency range of exhaust noise that can be amplified is small in dynamic driving mode. Therefore, by setting up retractable first, second, and third exhaust tailpipes, the length of at least one of the first, second, and third exhaust pipes can be actively adjusted to broaden the frequency range of exhaust noise that can be eliminated or the frequency range of exhaust noise that can be amplified.

[0080] In one alternative implementation, when the vehicle controller determines that the driver has activated the quiet driving mode, the speed of sound C can be determined first based on the temperature of the first exhaust pipe monitored by the temperature sensor. t Specifically, the sound velocity C of the first target noise that needs to be eliminated at the current rotational speed can be determined according to equation (1). t Equation (1) can be expressed as:

[0081]

[0082] Where t is the temperature of the first exhaust pipe.

[0083] Determine the sound velocity C of the first target noise that needs to be eliminated at the current rotational speed.t Afterwards, the frequency f of the first target noise can be determined, specifically, the frequency f of the first target noise can be determined according to formula (2), wherein formula (2) can be expressed as:

[0084]

[0085] Wherein, n is the speed of the engine, and order is the main order of the engine exhaust, for example, the main order of the exhaust of a four-cylinder engine is 2 order and 4 order. For another example, the main order of the exhaust of a six-cylinder engine is 3 order and 6 order.

[0086] After the speed of sound of the first target noise and the frequency of the first target noise are determined, the target length L of the second exhaust pipeline and the third exhaust pipeline can be determined, specifically, the target length L of the second exhaust pipeline and the third exhaust pipeline can be determined according to formula (3), wherein formula (3) can be expressed as:

[0087]

[0088] Wherein, since the engine exhaust includes two main orders, the first target length and the second target length can be obtained. Further, the target length of the second exhaust pipeline can be determined according to the first target length, and the target length of the third exhaust pipeline can be determined according to the second target length; or the target length of the second exhaust pipeline can be determined according to the second target length, and the target length of the third exhaust pipeline can be determined according to the first target length.

[0089] After the target length of the second exhaust pipeline and the target length of the third exhaust pipeline are determined, the air pressure in the second volume cavity and the third volume cavity can be adjusted by controlling the opening of the second flow control valve and the third flow control valve, and further, the second elastic member in the second volume cavity and the third elastic member in the third volume cavity are elastically deformed to drive the second tail pipe and the third tail pipe to stretch and retract, so as to adjust the length of the second exhaust pipeline and the third exhaust pipeline to the target length, thereby adjusting the exhaust noise frequency to be eliminated at the current speed.

[0090] The exhaust noise control method provided by the embodiment of the application can dynamically adjust the frequency of the exhaust noise to be eliminated according to the change of the engine speed and the change of the temperature in the exhaust pipeline when the vehicle is in the quiet driving mode, so as to achieve the effect of widening the frequency of the exhaust noise that can be eliminated.

[0091] Figure 3 A schematic diagram of a post-processing transmission loss curve is shown. Figure 3 As shown in the figure, since the volume of the post-processing assembly installed on the vehicle is small, the exhaust noise will not produce a large attenuation after passing through the traditional post-processing assembly. That is, the traditional post-processing assembly has poor silencing effect.

[0092] Figure 4 A schematic diagram of a transfer loss curve of the exhaust noise control system in the quiet driving mode is shown. As shown in the figure, in the quiet driving mode, the exhaust noise is greatly attenuated after passing through the exhaust noise control system. For example, at 100 Hz, the transfer loss reaches 40 dB, while Figure 4 the exhaust noise without being processed by the exhaust noise control system in the prior art has a transfer loss of only 5 dB at 100 Hz. Therefore, the exhaust noise control system and method provided by the present application can better eliminate exhaust noise, especially in the low frequency range. Figure 3

[0093] In another alternative embodiment, when the controller of the vehicle determines that the driving mode opened by the user is the dynamic driving mode, the sound speed C t1 of the second target noise to be amplified at the current speed can be determined according to the temperature of the first exhaust pipe monitored by the temperature sensor. Specifically, the sound speed C t1 of the second target noise to be amplified at the current speed can be determined according to formula (4):

[0094]

[0095] where t is the temperature of the first exhaust pipe.

[0096] After the sound speed C t1 of the second target noise is determined, the frequency f1 of the second target noise can be determined. Specifically, the frequency f1 of the second target noise can be determined according to formula (5):

[0097]

[0098] where n is the speed of the engine, order is the main order of the engine exhaust, for example, the main order of the exhaust of a four-cylinder engine is 2 orders and 4 orders. For example, the main order of the exhaust of a six-cylinder engine is 3 orders and 6 orders. m is the harmonic order corresponding to the speed interval to which the speed of the engine belongs. For example, the first harmonic order is the main order of the exhaust, the second harmonic order is twice the main order of the exhaust, and the third harmonic order is three times the main order of the exhaust. The controller has a pre-stored corresponding relationship between the speed interval and the set harmonic order.

[0099] The corresponding relationship between the speed interval and the set harmonic order is shown in the figure. When the engine speed is in the first speed interval, i.e. n1 Figure 5 < n2, the set harmonic order m is 3. When the engine speed is in the second speed interval, i.e. n2< n3, the set harmonic order m is 2. When the engine speed is in the third speed interval, i.e. n3 < n4, the set harmonic order m is 1.

[0100] wherein, n1, n2, n3, n4 are set rotation speeds, which can be set according to actual needs, and the present application does not make any limitation thereto. For example, n1 can be 800 r / min, n2 can be 1200 r / min, n3 can be 1600 r / min, and n4 can be 2400 r / min.

[0101] After determining the sound velocity of the second target noise to be amplified at the current rotation speed and the frequency of the second target noise, the target length L of the first exhaust pipeline and the target exhaust pipeline can be determined. Specifically, the target length L of the first exhaust pipeline and the target exhaust pipeline can be determined according to formula (6), wherein formula (6) can be expressed as:

[0102]

[0103] wherein, the target exhaust pipeline is the exhaust pipeline in the second exhaust pipeline and the third exhaust pipeline that is in a connected state. For example, if the second exhaust pipeline is in a connected state and the third exhaust pipeline is in a disconnected state, the target exhaust pipeline is the second exhaust pipeline. For another example, if the third exhaust pipeline is in a connected state and the second exhaust pipeline is in a disconnected state, the target exhaust pipeline is the third exhaust pipeline.

[0104] After determining the target length of the first exhaust pipeline and the target length of the target exhaust pipeline, the opening of the first flow control valve and the flow control valve corresponding to the target exhaust pipeline can be controlled to adjust the air pressure in the first volume cavity and the volume cavity corresponding to the target exhaust pipeline. Further, the elastic deformation of the first elastic member and the elastic member corresponding to the target exhaust pipeline can be caused to drive the first tail pipe and the tail pipe corresponding to the target exhaust pipeline to stretch and contract, so as to adjust the length of the first exhaust pipeline and the target exhaust pipeline to the target length, thereby adjusting the exhaust noise frequency to be amplified at the current rotation speed.

[0105] In some embodiments, in order to ensure the continuity and smoothness of the exhaust noise with the change of the rotation speed, when the engine rotation speed is in the first rotation speed interval and approaches the second rotation speed interval, the length of the first exhaust pipeline and the target exhaust pipeline can be adjusted in advance to the target length corresponding to the frequency in the second rotation speed interval. Similarly, when the engine rotation speed is in the second rotation speed interval and approaches the third rotation speed interval, the length of the first exhaust pipeline and the target exhaust pipeline can be adjusted in advance to the target length corresponding to the frequency in the third rotation speed interval.

[0106] Exemplarily, when the engine speed is in the first speed interval, and the difference between the engine speed and the first set speed value n1 is less than the set speed threshold, it can be determined that the engine speed is close to the second speed interval. Similarly, when the engine speed is in the second speed interval, and the difference between the engine speed and the third set speed value n3 is less than the set speed threshold, it can be determined that the engine speed is close to the third speed interval.

[0107] The set speed threshold can be freely set according to actual needs, for example, can be 50 r / min.

[0108] The exhaust noise control method provided by the embodiment of the application can dynamically adjust the frequency of the exhaust noise that needs to be amplified according to the change of the engine speed and the change of the temperature in the exhaust pipeline when the vehicle is in the power driving mode, so as to achieve the effect of widening the frequency of the exhaust noise that can be amplified.

[0109] Based on the same inventive concept, the embodiment of the application further provides a structural diagram of an exhaust noise control device, as shown in Figure 6 The exhaust noise control device comprises:

[0110] The response unit 601 is configured to control the second exhaust pipeline and the third exhaust pipeline to be in a connected or disconnected state in response to the operation of the user starting any driving mode, and the driving mode includes a quiet driving mode and a power driving mode.

[0111] The adjustment unit 602 is configured to adjust the length of at least one of the first exhaust pipeline, the second exhaust pipeline and the third exhaust pipeline based on the driving mode started by the user.

[0112] Based on the same inventive concept, the embodiment of the application further provides a controller. The controller at least comprises a memory for storing data and a processor, wherein for the processor for data processing, the processor can be implemented by a microprocessor, a CPU, a GPU (Graphics Processing Unit), a DSP or a FPGA when performing processing. For the memory, the memory stores operation instructions, the operation instructions can be computer executable codes, and each step in the flow of the exhaust noise control method of the embodiment of the application is implemented by the operation instructions.

[0113] Figure 7 A structural diagram of a controller provided by the embodiment of the application. As shown in Figure 7As shown, the controller 118 includes a memory 701, a processor 702, a data acquisition module 703 and a bus 704. The memory 701, the processor 702 and the data acquisition module 703 are connected through the bus 704 for transmitting data between the memory 701, the processor 702 and the data acquisition module 703.

[0114] The memory 701 can be used to store software programs and modules, and the processor 702 executes various functions and data processing of the controller 118 by running the software programs and modules stored in the memory 701, such as the exhaust noise control method provided in the embodiments of the present application. The memory 701 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, application programs of at least one application, etc.; and the data storage area can store data created according to the use of the controller 118, etc. In addition, the memory 701 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state memory device.

[0115] The processor 702 is the control center of the controller 118, and connects all parts of the controller 118 through the bus 704 and various interfaces and lines, and executes various functions and processes data of the controller 118 by running or executing the software programs and / or modules stored in the memory 701 and calling the data stored in the memory 701. Optionally, the processor 702 can include one or more processing units, such as a CPU, a GPU (Graphics Processing Unit), a digital processing unit, etc.

[0116] The embodiments of the present application also provide a computer readable storage medium, and the computer storage medium stores computer executable instructions. The computer program is executed by the processor and can be used to implement the exhaust noise control method described in any embodiment of the present application.

[0117] In some possible implementation manners, various aspects of the exhaust noise control method provided by the present application can also be implemented in the form of a program product, which includes program codes for causing a computer device to execute the steps of the exhaust noise control method according to various exemplary embodiments of the present application described above in the specification, for example, the computer device can execute the flow of the exhaust noise control method as shown in the specification. Figure 2

[0118] ​Those skilled in the art will appreciate that embodiments of the present application can be devised for a variety of other systems which are currently developed or later developed. Therefore, the present application is intended to cover all such modifications and variations of this application that are within the scope of the appended claims and their equivalents. It is intended that each element of claim 1 and 2 is independent of one another. No element of claim 1 and 2, or any other claim, is implied to depend on any other element or limitation of claim 1 and 2 or any other claim except where expressly recited in that claim.

[0119] The present application is described in reference to the flowchart and / or block diagrams of the method, apparatus (system) and computer program product according to this application. It will be understood that each block of the flowchart and / or block diagrams, and combinations of blocks in the flowchart 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 apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in one or more of the flowchart and / or block diagram block or blocks. Figure 1 means for performing one or more functions specified in one or more of the flowchart and / or block diagram block or blocks.

[0120] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in one or more of the flowchart and / or block diagram block or blocks. Figure 1 means for performing one or more functions specified in one or more of the flowchart and / or block diagram block or blocks.

[0121] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in one or more of the flowchart and / or block diagram block or blocks. Figure 1 means for performing one or more functions specified in one or more of the flowchart and / or block diagram block or blocks.

[0122] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. An exhaust noise control system, characterized in that, The exhaust noise control system includes a first exhaust pipe, a second exhaust pipe, a third exhaust pipe, a temperature sensor, a silencer, a first flow control valve, a second flow control valve, a third flow control valve, a first volume chamber, a second volume chamber, a third volume chamber, a first control valve, a second control valve, a first tailpipe, a second tailpipe, a third tailpipe, an air compressor, and a controller. The first exhaust pipe is connected to the after-treatment device. The first exhaust pipe is provided with at least one perforation and the first volume chamber. The first volume chamber is connected to the air compressor through the first air intake pipe. The first air intake pipe is provided with the first flow control valve. The first volume chamber is provided with the first elastic element. The first elastic element is connected to the first tail pipe at the lower end of the first volume chamber. The second exhaust pipe is a branch exhaust pipe of the first exhaust pipe. The second exhaust pipe is provided with a second volume chamber. The second volume chamber is connected to the air compressor through a second air intake pipe. A second flow control valve is provided in the second air intake pipe. A second elastic element is provided in the second volume chamber. The second elastic element is connected to a second tail pipe at the lower end of the second volume chamber. A first control valve is provided in the second tail pipe. The first control valve is used to control the second exhaust pipe to be in a connected or disconnected state. The third exhaust pipe is another branch exhaust pipe of the first exhaust pipe. The third exhaust pipe is provided with a third volume chamber. The third volume chamber is connected to the air compressor through a third air intake pipe. A third flow control valve is provided in the third air intake pipe. A third elastic element is provided in the third volume chamber. The third elastic element is connected to the third tail pipe at the lower end of the third volume chamber. A second control valve is provided in the third tail pipe. The second control valve is used to control the third exhaust pipe to be in the connected or disconnected state. The temperature sensor is installed on the first exhaust pipe; the silencing cavity is arranged adjacent to the first exhaust pipe, the second exhaust pipe and the third exhaust pipe, and the silencing cavity cooperates with the at least one perforation to eliminate high-frequency airflow noise in the exhaust noise control system; the first tailpipe, the second tailpipe and the third tailpipe are all retractable exhaust tailpipes, and the first volume cavity, the second volume cavity and the third volume cavity are all closed volume cavities; The controller responds to the user's operation of activating any driving mode by controlling the second exhaust pipe and the third exhaust pipe to be in a connected or disconnected state; The driving modes include a quiet driving mode and a dynamic driving mode; based on the driving mode activated by the user, the length of at least one of the first exhaust pipe, the second exhaust pipe, and the third exhaust pipe is adjusted.

2. An exhaust noise control method, used in the exhaust noise control system of claim 1, characterized in that, The method includes: In response to the user activating any driving mode, the second exhaust pipe and the third exhaust pipe are controlled to be connected or disconnected; the driving modes include quiet driving mode and dynamic driving mode; Based on the driving mode activated by the user, the length of at least one of the first exhaust pipe, the second exhaust pipe, and the third exhaust pipe is adjusted.

3. The method according to claim 2, characterized in that, The step of controlling the second exhaust pipe and the third exhaust pipe to be connected or disconnected in response to the user activating any driving mode includes: If the user activates the quiet driving mode, then the second exhaust pipe and the third exhaust pipe will be disconnected. If the user activates the power driving mode, the second exhaust pipe is controlled to be disconnected and the third exhaust pipe is controlled to be connected; or, the second exhaust pipe is controlled to be connected and the third exhaust pipe is controlled to be disconnected.

4. The method according to claim 2, characterized in that, The adjustment of the length of at least one of the first, second, and third exhaust pipes based on the user-activated driving mode includes: If the user activates the quiet driving mode, the lengths of the second and third exhaust pipes are adjusted according to the temperature of the first exhaust pipe and the engine speed. If the user activates the power driving mode, the lengths of the first exhaust pipe and the target exhaust pipe are adjusted according to the temperature of the first exhaust pipe and the engine speed; the target exhaust pipe is the exhaust pipe that is connected to the second exhaust pipe and the third exhaust pipe.

5. The method according to claim 4, characterized in that, The step of adjusting the lengths of the second and third exhaust pipes based on the temperature of the first exhaust pipe and the engine speed includes: The speed of sound of the first target noise is determined based on the temperature of the first exhaust pipe. The frequency of the first target noise is determined based on the engine speed; The target lengths of the second exhaust pipe and the third exhaust pipe are determined based on the sound velocity and frequency of the first target noise. The length of the second exhaust pipe is adjusted according to the target length of the second exhaust pipe, and the length of the third exhaust pipe is adjusted according to the target length of the third exhaust pipe.

6. The method according to claim 4, characterized in that, The step of adjusting the lengths of the first exhaust pipe and the target exhaust pipe based on the temperature of the first exhaust pipe and the engine speed includes: The velocity of sound of the second target noise is determined based on the temperature of the first exhaust pipe. The frequency of the second target noise is determined based on the engine speed; Based on the sound velocity of the second target noise and the frequency of the second target noise, determine the target length of the first exhaust pipe and the target length of the target exhaust pipe. The length of the first exhaust pipe is adjusted according to the target length of the first exhaust pipe, and the length of the target exhaust pipe is adjusted according to the target length of the target exhaust pipe.

7. The method according to claim 6, characterized in that, Determining the frequency of the second target noise based on the engine speed includes: Based on the engine's rotational speed range and the correspondence between the pre-stored rotational speed range and the set harmonics, the harmonics corresponding to the frequency of the second target noise are determined.

8. An exhaust noise control device for performing the method according to any one of claims 2 to 7, characterized in that, The device includes: A response unit is used to control the second exhaust pipe and the third exhaust pipe to be connected or disconnected in response to the user's operation of activating any driving mode; the driving modes include quiet driving mode and dynamic driving mode; An adjustment unit is used to adjust the length of at least one of the first exhaust pipe, the second exhaust pipe, and the third exhaust pipe based on the driving mode activated by the user.

9. A controller, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program that can run on the processor, and when the computer program is executed by the processor, it implements the method of any one of claims 2 to 7.

10. A computer-readable storage medium storing a computer program therein, characterized in that: When the computer program is executed by the processor, it implements the method of any one of claims 2 to 7.

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