CN113847118B - System and method for active sound emission of exhaust muffler assembly - Google Patents

Abstract

The invention provides a system and method for actively producing sound of an exhaust muffler assembly, belonging to the technical field of automobiles. It solves the problem that existing solutions cannot bring true motion sound. The system for actively producing sound of the exhaust muffler assembly includes an intake pipe and an exhaust pipe connected to the muffler assembly. The intake pipe is provided with an intake air flow sensor, and the muffler assembly is also connected with an inflatable pipe and an air outlet. The inflatable equipment connected to the inflatable pipe, the exhaust muffler assembly actively producing sound also includes a sound wave control unit, the intake air flow sensor and the inflatable equipment are all connected with the sound wave control unit, and the sound wave control unit is used to obtain according to the selected driving mode The target flow rate of the sound wave effect can be achieved, and then whether the inflatable device is turned on is controlled according to the comparison result between the target flow rate and the intake air flow rate collected by the intake air flow sensor. The invention can make the low-displacement vehicle achieve the real motion sound effect.

Description

System and method for active sound emission of exhaust muffler assembly

technical field

The invention belongs to the technical field of automobiles, and relates to a system and method for actively producing sound of an exhaust muffler assembly.

Background technique

With the rapid development of society, people's personalized demand for automobile products is increasing, and more and more people are pursuing the excitement brought by the sound of automobile exhaust. However, among the existing actual automobile products, the sound of exhaust movement is more Exclusively for the luxury car market, low-displacement cars are limited by engine flow. In the existing solutions, the opening angle of the sound valve is more used to achieve a certain stage of the exhaust sound or by adding a microphone to preset the sound program. To realize the sound of exhaust motion, such as a method and system for simulating sound waves of an automobile engine disclosed in Chinese patent documents, when operating the brake pedal or accelerator pedal of a new energy vehicle, the audio data of the corresponding frequency is selected and the audio frequency is sent. The data is sent to the car audio, and by simulating the various sounds emitted by the engine of the fuel car, the linkage with driving is realized, which enhances the driving pleasure and driving experience.

However, the above solutions have the following shortcomings: the sound wave valve scheme, often due to the limitation of engine displacement, the sound wave valve cannot completely realize the real sports sound brought by the large-displacement car through the internal structure design of the tuning valve and the muffler, while the microphone or The audio solution can't bring real sports sound. Therefore, for low-displacement vehicles, existing solutions cannot provide a perfect acoustic solution.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the above-mentioned problems existing in the prior art, and propose a system and method for active sound emission of an exhaust muffler assembly. The technical problem to be solved is: how to make a low-displacement vehicle achieve a real moving sound. Effect.

The object of the present invention can be achieved through the following technical solutions: a system for actively producing sound of an exhaust muffler assembly, an intake pipe and an exhaust pipe connected to the muffler assembly, and the intake pipe is provided with a monitor for monitoring An intake air flow sensor for the intake air flow rate discharged by the engine in the intake pipe, the muffler assembly is also connected with an air charge pipe and an inflatable device connected to the charge pipe, and the exhaust muffler assembly actively emits sound The system is also It includes a sound wave control unit, and the intake air flow sensor and the inflatable device are both connected to the sound wave control unit, and the sound wave control unit is used to obtain the target flow rate that can achieve the sound wave effect according to the selected driving mode, and then according to the target flow rate and intake. The comparison result of the intake air flow collected by the air flow sensor is used to control whether the inflatable device is turned on.

The working principle is: in order to enable low-displacement vehicles to achieve the effect of sports sound waves, the target flow corresponding to each mode is pre-stored in the system, and the set target flow rate is the flow rate that can make the vehicle achieve the effect of sports sound waves; During the driving process, the intake air flow sensor installed on the intake duct collects the gas flow discharged from the engine in real time and sends the collected gas flow signal to the sound wave control unit. The sound wave control unit firstly selects the driving mode according to the current vehicle. to obtain the target flow rate, and then compare the gas flow rate collected by the intake air flow sensor with the target flow rate. When the collected gas flow rate is less than the target flow rate, a control command to control the opening of the inflatable device is output, and the inflatable device starts to work under the action of the control command. , the air charge flow is generated and entered into the muffler assembly and the intake air flow is aggregated and discharged from the outlet pipe. The setting of the inflatable equipment increases the exhaust flow in the muffler assembly, so that low-displacement vehicles can also obtain The sports sound effect that a large-displacement car can achieve, and the sports sound effect is real.

In the above-mentioned system for actively producing sound from an exhaust muffler assembly, an inflation flow sensor for monitoring the inflation flow in the inflation duct is provided on the inflation duct, the inflation flow sensor is connected to a sound wave control unit, and the sound wave control unit It is used to control whether the inflation device is closed or not according to the inflation flow monitored by the inflation flow sensor. The setting of the charge flow sensor can make the sum of the charge flow and the intake flow accurately control within the target flow, and improve the sound effect of low-displacement vehicles.

In the above-mentioned system for actively producing sound by an exhaust muffler assembly, the sound wave control unit includes:

The target flow storage module is used to store the target flow that can achieve the sound effect in different driving modes;

The driving parameter acquisition module is used to acquire the driving parameters of the vehicle in each driving mode, including the engine speed signal, the accelerator opening signal, the actual gear signal, the ignition switch status signal and the ambient temperature signal;

The target flow correction module is used to correct the target flow in the target flow storage module according to the vehicle driving parameters, so as to obtain the target flow correction value in the corresponding driving mode;

The preset flow acquisition module is used to obtain the corresponding target flow correction value according to the currently selected driving mode and vehicle driving parameters;

The control module is used to control the charging equipment to perform charging work to the muffler assembly when the intake flow collected by the intake flow sensor is less than the target flow, and according to the comparison result of the sum of the charging flow and the intake flow and the target flow correction value. Controls whether the inflator stops working.

In the above-mentioned system for actively producing sound from an exhaust muffler assembly, the control module includes:

The total flow calculation sub-module is used to add the charging flow and the intake flow collected by the intake flow sensor to obtain the actual total gas flow;

The total flow deviation comparison sub-module is used to compare the actual total gas flow with the target flow correction value to obtain the total flow deviation;

The control sub-module is used to determine that the actual total gas flow meets the requirements when the total flow deviation meets the error range of the target flow correction value, and control the inflatable equipment to stop working.

Control the actual total gas flow within the error range of the target flow correction value. The error range can be set manually. For example, the error setting is set with plus or minus 10% of the target flow correction value. When it is inside, it means that the sum of the current inflation flow and the intake air flow meets the requirement of the target flow correction value in the current mode, and can achieve the motion sound effect of high-displacement vehicles. At this time, the inflatable equipment is controlled to stop working; the actual total gas When the flow rate is not within the error range of the target flow correction value and less than the target flow correction value, the inflatable equipment is controlled to continue to work, and when the actual total gas flow is not within the error range of the target flow correction value but greater than the target flow correction value, the inflatable equipment is controlled to stop working.

In the above-mentioned system for actively producing sound from the exhaust muffler assembly, the control module further includes:

The difference comparison sub-module is used to obtain the flow difference between the intake air flow and the target flow correction value;

The flow deviation comparison sub-module is used to compare the inflation flow monitored in real time by the inflation flow sensor with the flow difference to obtain the flow deviation;

The control sub-module is used to control the total flow calculation sub-module to add the charge air flow and the intake air flow when the flow deviation meets the set flow error range.

First, the flow difference between the intake air flow and the target flow correction value is obtained through the difference comparison sub-module, and the inflatable equipment is controlled to inflate and perform the inflating action based on the flow difference. When the inflation flow is within the error range of the flow difference The error range can be set manually. For example, the error is set with plus or minus 10% of the flow difference value, and then the total flow calculation sub-module is controlled to calculate the sum of the current inflation flow and the intake flow, so as to avoid total flow during judgment. The flow calculation sub-module needs to add and calculate in real time, and then compare it with the target flow correction value. The operation is complicated. The flow difference is obtained through the difference comparison sub-module, and the flow difference is used to judge whether the inflation flow meets the requirements. When the requirements are met Then it is judged whether the sum of the charge flow rate and the intake flow rate satisfies the target flow rate correction value, which effectively simplifies the judgment step.

In the above-mentioned system for actively producing sound from the exhaust muffler assembly, a tuning valve is provided on the air outlet pipe, and the sound wave control unit is connected to the tuning valve. The setting of the pressure regulating valve can further increase the effect of sports sound waves, and can obtain different sports sound waves.

In the above-mentioned system in which the exhaust muffler assembly actively emits sound, the sound wave control unit is further connected with a selection button for enabling or disabling the car sports sound wave function. The setting of the selection button enables the driver to select the desired function according to their own needs, which is more user-friendly.

In the above-mentioned system for actively producing sound from the exhaust muffler assembly, the sound wave control unit is further connected with an inflation controller for controlling the inflation device to stop inflation or start inflation. The setting of the inflation controller can control the opening and closing of the inflation equipment more quickly.

A method for actively producing sound from an exhaust muffler assembly, comprising the following steps:

Obtain the target flow rate that can achieve the sound effect according to the selected driving mode;

The intake air flow discharged from the engine in the intake duct of the muffler assembly is obtained through real-time acquisition by the intake air flow sensor;

Compare the intake air flow with the target flow, and control the inflator to inflate the muffler assembly when the intake flow is less than the target flow;

The inflation flow generated by the inflatable device is monitored in real time through the inflation flow sensor, and whether the inflatable device stops working is controlled according to the comparison result between the sum of the inflation flow and the intake flow and the target flow.

The working principle is: first, according to the current driving mode of the vehicle, obtain the target flow rate in order to achieve the effect of sports sound waves when the vehicle is exhausted. Driving modes include energy-saving mode (ECO), comfort mode (Comfort), sports mode (Sports) and S+, etc. Each mode corresponds to a different target flow rate. While obtaining the target flow, the intake air flow sensor also collects the intake air flow in the intake pipe of the muffler assembly in real time. The intake flow in the intake pipe of the muffler assembly is the gas discharged from the engine operation. Afterwards, the collected intake air flow will be compared with the target flow. When the intake air flow is less than the target flow, it means that the current intake flow cannot make the vehicle achieve the effect of moving sound waves, and it is necessary to control the start of the inflatable equipment so that the inflatable equipment can be silenced. During the inflation of the inflatable equipment, the inflation flow sensor will monitor the inflation flow generated by the inflatable equipment in real time, and when the sum of the inflation flow and the intake air flow reaches the target flow, the inflatable equipment will be controlled to stop working. The vehicle can achieve the motion sound wave effect required by the driver during the driving process, and the motion sound wave effect is real, effectively solving the problem that the existing low-displacement vehicle cannot achieve the real motion sound wave brought by the large-displacement vehicle.

In the above-mentioned method for actively producing sound from an exhaust muffler assembly, after obtaining the target flow rate capable of achieving the sound wave effect according to the selected driving mode, the target flow rate is corrected according to the vehicle driving parameters in the driving mode, and the modified Operations include:

Obtain vehicle driving parameters in this driving mode, including engine speed signal, accelerator opening signal, actual gear signal, ignition switch status signal, and ambient temperature signal;

The target flow rate is corrected according to the vehicle driving parameters, so as to obtain the target flow rate correction value in the corresponding driving mode. The target flow correction value can be set in advance according to the vehicle driving parameters. After the target flow rate is obtained, the target flow correction value is obtained according to the vehicle driving parameters, and the operation of the inflatable equipment is controlled by the target flow correction value. This operation can make the movement The sound wave effect emits sound according to the actual driving conditions of the vehicle, which effectively improves the sports sound wave effect of low-displacement vehicles.

In the above-mentioned method for actively producing sound from an exhaust muffler assembly, the operation of controlling whether to stop working of the inflatable device according to the comparison result of the sum of the air charge flow rate and the intake air flow rate and the target flow rate includes:

Obtain the flow difference between the intake air flow and the target flow correction value;

Compare the charge flow rate monitored by the charge flow sensor in real time with the flow difference to obtain the flow deviation. When the flow deviation meets the set flow error range, add the charge flow and the intake flow collected by the intake flow sensor to obtain the actual flow rate. total gas flow;

The total flow deviation is obtained by comparing the actual total gas flow with the target flow correction value. When the total flow deviation meets the set total flow error range, it is determined that the actual total gas flow meets the requirements, and the inflatable equipment is controlled to stop working.

The work of the inflatable equipment can make the total flow in the muffler assembly reach the target flow, so that the low-displacement car can also achieve the sporty sound effect of the large-displacement car.

In the above-mentioned method for actively producing sound from the exhaust muffler assembly, when it is determined that the actual total gas flow meets the requirements and the inflatable equipment is controlled to stop working, the tuning at the outlet pipe of the muffler assembly is controlled according to the driving mode and vehicle driving parameters. The opening of the valve is adjusted. The opening of the tuning valve can be preset according to the driving mode and the driving parameters of the vehicle. The control of the opening of the tuning valve can further improve the effect of exhaust sound waves, so that different driving modes emit different sounds, or make the same sound. There are various driving modes that emit different motion sounds to meet the needs of different drivers and passengers. Just like in the same driving mode, three sub-modes of mild, moderate and intense can be set.

In the above-mentioned method for actively producing sound of an exhaust muffler assembly, the following steps are further included:

Set the selection button for turning on or off the car motion sound function;

Before obtaining the operation steps for obtaining the target flow rate capable of achieving the sound wave effect according to the selected driving mode, the car sports sound wave function is turned on by operating the selection button. Select the button settings, so that the driver can turn it on by selecting the button when he needs to feel the effect of sports sound waves, and can turn it off by selecting the button when it is not needed. The control is more intelligent and more user-friendly, which can better meet the needs of most people. .

Compared with the prior art, the system and method for actively producing sound of an exhaust muffler assembly have the following advantages:

1. The present invention controls the inflation flow of the inflatable equipment, so that the low-displacement vehicle can also achieve the real motion sound effect, and solves the problem that it is difficult to obtain the high-displacement engine motion sound when the low-displacement engine has insufficient flow or instantaneous airflow. quality issues.

2. The present invention also acquires the vehicle driving parameters, and corrects the target flow in real time according to the vehicle driving parameters, so that the final sound wave effect can be changed according to the current driving state of the vehicle, and realizes the different motion sound waves of the full driving mileage under comprehensive road conditions. The quality of the motion sound.

Description of drawings

FIG. 1 is a schematic diagram of the control structure of the present invention.

Figure 2 is a schematic structural diagram of the present invention.

FIG. 3 is a schematic diagram of the control flow of the present invention.

FIG. 4 is a control flow chart of the present invention.

In the figure, 1. Muffler assembly; 2. Intake pipe; 3. Outlet pipe; 4. Intake flow sensor; 5. Inflatable flow sensor; 6. Inflatable equipment; 7. Inflatable pipe; 81, target flow storage module; 82, preset flow acquisition module; 83, control module; 83a, difference comparison submodule; 83b, flow deviation comparison submodule; 83c, total flow calculation submodule; 83d, total flow deviation comparison Submodule; 83e, control submodule; 84, driving parameter acquisition module; 85, target flow correction module; 9, inflation controller; 10, tuning valve; 11, selection button.

Detailed ways

The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

As shown in FIG. 2 , the system for actively producing sound by the exhaust muffler assembly 1 includes an air intake pipe 2 and an air outlet pipe 3 connected to the muffler assembly 1 , and the muffler assembly 1 is also connected with an inflation pipe 7 and The inflatable device 6 connected to the inflatable pipe 7 is used to provide gas to increase the exhaust flow in the muffler assembly 1, and the intake pipe 2 is provided with an intake flow for monitoring the engine discharge in the intake pipe 2. The intake air flow sensor 4 is provided, the air charging pipe 7 is provided with an air charging flow sensor 5 for monitoring the air charging flow in the air charging pipe 7, and the air outlet pipe 3 is provided with a tuning valve 10.

As shown in FIG. 1, the system for actively producing sound of the exhaust muffler assembly 1 further includes a sound wave control unit 8, a charge controller 9, a selection button 11, a charge flow sensor 5, an intake flow sensor 4, a tuning valve 10 and The selection buttons 11 are all connected to the sound wave control unit 8 , and the inflation controller 9 is respectively connected to the sound wave control unit 8 and the inflatable device 6 . The sound wave control unit 8 includes:

The target flow storage module 81 is used to store the target flow that can achieve the sound wave effect under different driving modes;

The driving parameter acquisition module 84 is used to acquire the driving parameters of the vehicle in each driving mode, including the engine speed signal, the accelerator opening signal, the actual gear signal, the ignition switch status signal and the ambient temperature signal;

The target flow correction module 85 is used to correct the target flow in the target flow storage module 81 according to the vehicle driving parameters, so as to obtain the target flow correction value in the corresponding driving mode;

A preset flow acquisition module 82, configured to obtain a corresponding target flow correction value according to the currently selected driving mode and vehicle driving parameters;

The control module 83 is used to control the charging device 6 to perform charging to the muffler assembly 1 when the intake flow collected by the intake flow sensor 4 is less than the target flow, and correct the value according to the sum of the charging flow and the intake flow and the target flow The comparison result is used to control whether the inflatable device 6 stops working. The connection relationship between the modules is as follows: the target flow storage module 81 is respectively connected with the preset flow acquisition module 82 and the target flow correction module 85, the driving parameter acquisition module 84 is connected with the target flow correction module 85, and the preset flow acquisition module 82 is connected with the target flow correction module 85. The control module 83 is connected.

The control module 83 specifically includes:

a difference value comparison sub-module 83a, configured to obtain a flow rate difference between the intake air flow rate and the target flow rate;

The flow deviation comparison sub-module 83b is used to obtain the flow deviation by comparing the inflation flow and the flow difference value monitored in real time by the inflation flow sensor 5;

The total flow calculation sub-module 83c is used to add the charge flow and the intake flow collected by the intake flow sensor 4 to obtain the actual total gas flow when the flow deviation meets the set flow error range;

The total flow deviation comparison sub-module 83d is used for comparing the actual total gas flow with the target flow correction value to obtain the total flow deviation;

The control sub-module 83e is used to determine that the actual total gas flow meets the requirements when the total flow deviation meets the set total flow error range, and control the inflatable device 6 to stop working;

The difference comparison sub-module 83a is respectively connected to the intake air flow sensor 4, the preset flow acquisition module 82, the target flow correction module 85, the flow deviation comparison sub-module 83b and the control sub-module 83e, and is used to obtain the intake air flow and the target flow correction value Compare the intake air flow with the target flow correction value, send the comparison result to the control sub-module 83e and send the obtained flow difference value to the flow deviation comparison sub-module 83b; the flow deviation comparison sub-module 83b communicates with the charge flow sensor 5 and the control The sub-module 83e is connected to compare the inflation flow with the flow difference and transmit the obtained flow deviation to the control sub-module 83e; the total flow calculation sub-module 83c is respectively connected to the total flow deviation comparison sub-module 83d, the inflation flow sensor 5 and The intake air flow sensor 4 is used for adding and calculating the air charge flow rate and the intake air flow rate to obtain the actual total gas flow rate, and sending the actual total gas flow rate to the total flow deviation comparison sub-module 83d; the total flow deviation comparison sub-module 83d is respectively connected to The control sub-module 83e and the preset flow acquisition module 82 are used to compare the actual total gas flow with the target flow correction value to obtain the total flow deviation and transmit the total flow deviation to the control sub-module 83e; the control sub-module 83e and the inflation controller 9 is connected to the tuning valve 10 for sending control commands to the inflation controller 9 and controlling the tuning valve 10 to adjust the opening degree, and the inflation controller 9 controls the inflation device 6 to start or close according to the control command.

When the system is working, the target flow storage module 81 in the sound wave control unit 8 first pre-stores the target flow rate that can achieve the sound wave effect under different driving modes. The exhaust flow in various modes is measured to store the obtained exhaust flow as the target flow. In order to achieve a more optimized motion sound effect, the vehicle driving parameters obtained by the driving parameter acquisition module 84 are also obtained through the target flow correction module 85 . The target flow is corrected, that is, according to the engine speed signal, the accelerator opening signal, the actual gear signal, the ignition switch status signal and the ambient temperature signal, etc., the corresponding target flow correction value is obtained and stored in the target flow storage module 81. The target flow correction value can also be set by measuring the exhaust flow rate of a large-displacement vehicle in various modes and various vehicle driving parameters, so as to store the obtained exhaust gas flow rate as the target flow correction value.

When the selection button 11 selects to enable the motion sound wave function, the preset flow acquisition module 82 in the sound wave control unit 8 obtains the target flow correction value according to the current driving mode of the vehicle and the vehicle driving parameters, and sends the target flow correction value to the control module 83. The difference comparison sub-module 83a, the difference comparison sub-module 83a receives the intake air flow rate collected by the intake air flow sensor 4, compares the intake air flow rate with the target flow correction value, and sends when the intake air flow rate is less than the target flow correction value The comparison result is sent to the control sub-module 83e, and at the same time, the flow difference value obtained by comparing the air flow with the target flow correction value is sent to the flow deviation comparison sub-module 83b, and the control sub-module 83e sends an opening control command to the inflation according to the received comparison result. The controller 9, the inflation controller 9 controls the inflation device 6 to work according to the received opening control command, and the gas generated by the inflation device 6 is transported to the muffler assembly 1 through the inflation pipeline 7, and is connected with the muffler assembly 1. At the same time, the charging flow sensor 5 monitors the charging flow in the charging pipe 7 and sends the charging flow to the flow deviation comparison sub-module 83b, and the flow deviation comparison module compares the charging flow with the flow difference The flow deviation is obtained, and the flow deviation is sent to the control sub-module 83e. When the control sub-module 83e judges that the flow deviation meets the set flow error range, the total flow calculation sub-module 83c adds the charge flow and the intake flow to obtain the The actual total gas flow is sent to the total flow deviation comparison sub-module 83d, and the total flow deviation comparison sub-module 83d compares the actual total gas flow with the target flow correction value to obtain the total flow deviation, and calculates the total flow deviation. Sent to the control sub-module 83e, when the control sub-module 83e judges that the total flow deviation meets the error range of the set target flow correction value, it sends a shutdown control command to the inflation controller 9, and the inflation controller 9 controls the inflation device 6 to shut down. At this time, the flow rate in the muffler assembly 1 can satisfy the motion sound effect of a large-displacement vehicle. In order to further improve the motion sound effect, the control sub-module 83e also controls the opening of the tuning valve 10. By adjusting The opening degree of the tuning valve 10 can obtain different sound wave effects, which can better meet the needs of users. Conversely, when the flow deviation does not meet the set flow error range and the inflation flow is less than the flow difference value or the total flow deviation does not meet the set total flow error range and the actual total gas flow is less than the target flow correction value, control the inflation device 6 to continue. Inflate. Generally speaking, under the real-time monitoring of the inflation flow sensor 5, the flow deviation and the total flow deviation will not exceed the set positive flow error range. In the flow error range but the inflation flow is greater than the flow difference or the total flow deviation does not meet the set total flow error range but the actual total gas flow is greater than the target flow correction value, the inflation device 6 is controlled to stop inflation.

As shown in Figures 3 and 4, the method for actively producing sound by the exhaust muffler assembly 1 includes the following steps:

First, set the selection button 11 for turning on or off the motion sound wave function of the car; when the motion sound wave function is turned on when the selection button is selected, the target flow rate that can achieve the sound wave effect is obtained according to the selected driving mode; Based on the different motion sounds of the full mileage under road conditions, the driving parameters of the vehicle in this driving mode are obtained, including the engine speed signal, the accelerator opening signal, the actual gear signal, the ignition switch status signal and the ambient temperature signal; The target flow is corrected to obtain the target flow correction value in the corresponding driving mode; during the driving process of the vehicle, the intake air flow from the engine in the intake duct 2 of the muffler assembly 1 is collected in real time through the intake flow sensor 4, and then Compare the intake air flow with the target flow, and control the inflatable device 6 to inflate the muffler assembly 1 when the intake air flow is less than the target flow. flow, and control whether the inflatable device 6 stops working according to the comparison result of the sum of the inflation flow and the intake flow with the target flow. The specific operations include:

Obtain the flow difference between the intake air flow and the target flow correction value;

Compare the charge flow rate monitored by the charge flow sensor 5 in real time with the flow difference value to obtain the flow rate deviation. When the flow rate deviation meets the set flow error range, the charge flow rate and the intake air flow rate collected by the intake air flow sensor 4 are added to obtain the flow rate deviation. Get the actual total gas flow;

Comparing the actual total gas flow with the target flow correction value to obtain the total flow deviation, when the total flow deviation meets the set total flow error range, it is determined that the actual total gas flow meets the requirements, and the inflator 6 is controlled to stop working, and then according to the driving mode Adjust the opening of the tuning valve 10 at the outlet pipe of the muffler assembly 1 with the vehicle driving parameters;

On the contrary, when the flow deviation does not meet the set flow error range or the total flow deviation does not meet the set total flow error range, the inflation device 6 is controlled to continue to inflate.

The method for actively producing sound by the exhaust muffler assembly 1 is based on the method realized by each component of the system for actively producing sound by the exhaust muffler assembly 1 . The working principle of a system for actively producing sound by the exhaust muffler assembly 1 has been described above, and the working principle of the method for actively producing sound by the exhaust muffler assembly 1 will not be repeated here.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention pertains can make various modifications or additions to the described specific embodiments or substitute in similar manners, but will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (9)

1. A system for actively producing sound from an exhaust muffler assembly, comprising an air intake duct (2) and an air outlet duct (3) connected to the muffler assembly (1), characterized in that the air intake duct ( 2) An intake air flow sensor (4) for monitoring the intake air flow rate discharged from the engine in the intake pipe (2) is provided, and the muffler assembly (1) is also connected with a charging pipe (7) and a gas charging pipe (7). The inflatable device (6) connected to the pipeline (7), the system for actively producing sound of the exhaust muffler assembly further includes a sound wave control unit (8), the intake air flow sensor (4) and the inflatable device (6) are both connected to The sound wave control unit (8) is connected, and the sound wave control unit (8) is used to obtain a target flow rate capable of achieving the sound wave effect according to the selected driving mode, and then according to the target flow rate and the intake air collected by the intake flow sensor (4) The comparison result of the flow is used to control whether the inflatable device (6) is turned on; The inflation pipeline (7) is provided with an inflation flow sensor (5) for monitoring the inflation flow in the inflation pipeline (7), the inflation flow sensor (5) is connected with a sound wave control unit (8), and the sound wave control unit (8) is used to control whether the inflation device (6) is closed according to the inflation flow rate monitored by the inflation flow sensor (5). 2. The system for actively producing sound of an exhaust muffler assembly according to claim 1, wherein the sound wave control unit (8) comprises: a target flow storage module (81), used for storing the target flow that can achieve the sound wave effect under different driving modes; a driving parameter acquisition module (84) for acquiring vehicle driving parameters in each driving mode, including an engine speed signal, an accelerator opening signal, an actual gear signal, an ignition switch state signal, and an ambient temperature signal; a target flow correction module (85), configured to correct the target flow in the target flow storage module (81) according to the vehicle driving parameters, so as to obtain a target flow correction value corresponding to the driving mode; a preset flow acquisition module (82), configured to obtain a corresponding target flow correction value according to the currently selected driving mode and vehicle driving parameters; A control module (83) is configured to control the charging device (6) to perform charging to the muffler assembly (1) when the intake flow collected by the intake flow sensor (4) is less than the target flow, and according to the charging flow and the intake The sum of the flow is compared with the target flow correction value to control whether the inflator (6) stops working. 3. The system for actively producing sound of an exhaust muffler assembly according to claim 2, wherein the control module (83) comprises: A total flow calculation sub-module (83c) for adding the charge flow rate monitored in real time by the charge charge flow rate sensor (5) and the intake air flow rate collected by the intake air flow rate sensor (4) to obtain the actual total gas flow rate; The total flow deviation comparison sub-module (83d) is used to obtain the total flow deviation by comparing the actual total gas flow with the target flow correction value; The control sub-module (83e) is used for determining that the actual total gas flow meets the requirements when the total flow deviation meets the error range of the target flow correction value, and controls the inflator to stop working. 4. The system for actively producing sound of an exhaust muffler assembly according to claim 3, wherein the control module (83) further comprises: a difference comparison sub-module (83a), used to obtain a flow difference between the intake air flow and the target flow correction value; a flow deviation comparison sub-module (83b), configured to obtain the flow deviation by comparing the inflation flow rate monitored in real time by the inflation flow sensor (5) with the flow difference value; The control sub-module (83e) is configured to control the total flow calculation sub-module (83c) to add the charge flow and the intake flow when the flow deviation meets the set flow error range. 5. The system for actively producing sound of an exhaust muffler assembly according to any one of claims 1 to 4, wherein a tuning valve (10) is provided on the air outlet pipe (3), and the sound wave controls The unit (8) is connected with the tuning valve (10); the sound wave control unit (8) is also connected with a selection button (11) for turning on or off the car sports sound wave function and for controlling the stop of the inflatable device (6) Inflate or turn on inflation control (9). 6. A method for actively producing sound by an exhaust muffler assembly, comprising the steps of: Obtain the target flow rate that can achieve the sound effect according to the selected driving mode; The intake air flow rate discharged from the engine in the intake pipe (2) of the muffler assembly (1) is acquired in real time through the intake air flow sensor (4); Comparing the intake air flow with the target flow, and controlling the inflating device (6) to inflate the muffler assembly (1) when the intake air flow is less than the target flow; The inflation flow generated by the inflation device (6) is monitored in real time by the inflation flow sensor (5), and whether the inflation device (6) stops working is controlled according to the comparison result between the sum of the inflation flow and the intake flow and the target flow. 7 . The method for actively producing sound of an exhaust muffler assembly according to claim 6 , wherein, after obtaining the target flow rate for achieving the sound wave effect according to the selected driving mode, according to the driving parameters of the vehicle in the driving mode. The target flow is corrected, and the operation of the correction includes: Obtain vehicle driving parameters in this driving mode, including engine speed signal, accelerator opening signal, actual gear signal, ignition switch status signal, and ambient temperature signal; The target flow rate is corrected according to the vehicle driving parameters, so as to obtain the target flow rate correction value in the corresponding driving mode. 8. The method for actively producing sound of an exhaust muffler assembly according to claim 7, wherein whether the inflatable device (6) stops working is controlled according to the comparison result of the sum of the air flow rate and the air intake flow rate and the target flow rate. Operations include: Obtain the flow difference between the intake air flow and the target flow correction value; Comparing the charging flow rate monitored in real time by the charging flow sensor (5) with the flow difference value to obtain the flow deviation, when the flow deviation meets the set flow error range, compare the charging flow with the intake flow collected by the intake flow sensor (4) Add up to get the actual total gas flow; Comparing the actual total gas flow with the target flow correction value to obtain the total flow deviation, when the total flow deviation meets the set total flow error range, it is determined that the actual total gas flow meets the requirements, and the inflatable device (6) is controlled to stop working. 9. The method for actively producing sound of an exhaust muffler assembly according to claim 8, characterized in that, when determining that the actual total gas flow meets the requirements and controlling the inflatable device (6) to stop working, according to the driving mode and the driving mode of the vehicle The parameters control the tuning valve (10) at the outlet pipe of the muffler assembly (1) to adjust the opening degree.

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