Silencing element transmission loss test method and system and storage medium

Abstract

The invention relates to the technical field of vehicle testing, in particular to a silencing element transmission loss testing method and system and a storage medium. The silencing element comprises a tone tuning valve used for adjusting the noise reduction effect, and the silencing element transmission loss testing method comprises the steps that a second corresponding relation between the engine at different rotating speeds and the opening angle of the tone tuning valve is calculated according to the first corresponding relation between the rotating speed of the engine and the exhaust flow generated by the engine; searching a corresponding tuning valve target opening angle of the engine at the target rotating speed from the second corresponding relation; after the tuning valve is adjusted to the target opening angle, sound transmission loss testing is conducted on the silencing element, and a sound transmission loss testing result of the silencing element under the target rotating speed of the engine is obtained. According to the invention, by acquiring the relationship between the engine speed and the opening degree of the tuning valve, the silencing element can be tested under different engine speeds, so that the accuracy of the transmission loss test result of the silencing element can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle testing technology, and in particular to a method, system and storage medium for testing transmission loss of a muffler element. Background Art

[0002] With the rapid growth of vehicle ownership, vehicle noise pollution is becoming more and more serious. Engine intake and exhaust noise is the main source of vehicle noise. Reasonable noise reduction components can be used to reduce vehicle noise. Transmission loss is the most direct technical indicator to measure the noise reduction ability of a noise reduction component. It defines the amount of energy lost during the transmission of sound through the microphone.

[0003] In the related art, when the transmission loss test is performed on the muffler element, the valve angle in the muffler element cannot be adjusted and can only be maintained at the initial state. However, during the operation of the vehicle, the valve angle in the muffler element changes with the change of the engine speed, and the acoustic performance of the muffler element is different at different valve angles. Therefore, the accuracy of the test results obtained by the transmission loss test of the muffler element in the prior art is not enough. Summary of the invention

[0004] The present disclosure provides a method, system and storage medium for testing transmission loss of a muffler element, the main purpose of which is to improve the accuracy of the transmission loss test result of the muffler element.

[0005] According to one aspect of the present disclosure, a method for testing transmission loss of a muffler element is provided, wherein the muffler element includes a tuning valve for adjusting a noise reduction effect, and the method includes:

[0006] According to the first corresponding relationship between the engine speed and the exhaust flow rate generated by the engine, a second corresponding relationship between the engine speed and the opening angle of the tuning valve at different engine speeds is calculated;

[0007] Finding the target opening angle of the tuning valve corresponding to the target speed of the engine from the second corresponding relationship;

[0008] After the tuning valve is adjusted to the target opening angle, a sound transmission loss test is performed on the silencer element to obtain a sound transmission loss test result of the silencer element at a target engine speed.

[0009] Optionally, the calculating, based on the first corresponding relationship between the engine speed and the exhaust flow rate generated by the engine, a second corresponding relationship between the engine speed and the opening angle of the tuning valve at different engine speeds includes:

[0010] The first correspondence relationship between the engine speed and the exhaust flow rate generated by the engine and the third correspondence relationship set are fitted to obtain a second correspondence relationship between the engine speed and the opening angle of the tuning valve at different engine speeds, wherein the first correspondence relationship includes the exhaust flow rate and pressure corresponding to any engine speed of at least one engine speed, and the third correspondence relationship set includes a third correspondence between at least one exhaust flow rate and pressure, and the third correspondence relationship has a one-to-one correspondence with the opening angle of the tuning valve.

[0011] Optionally, before fitting the first correspondence relationship and the third correspondence relationship set between the engine speed and the exhaust flow rate generated by the engine, the method further includes:

[0012] When the muffler element is connected to an engine, the engine speed of the engine is controlled to obtain the first corresponding relationship;

[0013] A simulation calculation is performed on a reducer of at least one diameter to obtain the third corresponding relationship set, wherein the third corresponding relationship corresponds to the diameter of the tube one-to-one, and the diameter of the tube corresponds to the opening angle of the tuning valve one-to-one.

[0014] Optionally, fitting the first correspondence relationship between the engine speed and the exhaust flow rate generated by the engine and the third correspondence relationship set to obtain a second correspondence relationship between the engine speed and the opening angle of the tuning valve at different engine speeds includes:

[0015] Performing pipe diameter fitting on the first corresponding relationship and the third corresponding relationship set to obtain a fourth corresponding relationship between the pipe diameter and different engine speeds, wherein the pipe diameter corresponds to the engine speed in a one-to-one manner;

[0016] The fourth corresponding relationship and the fifth corresponding relationship between the pipe diameter and the opening angle of the tuning valve are fitted to obtain a second corresponding relationship between the engine at different speeds and the opening angle of the tuning valve.

[0017] Optionally, the controlling the engine speed of the engine to obtain the first corresponding relationship includes:

[0018] Detecting the temperature of the measuring point corresponding to the muffler element;

[0019] When the temperature at the measuring point meets the temperature requirement, the engine speed of the engine is controlled to obtain the first corresponding relationship.

[0020] Optionally, the controlling the engine speed of the engine to obtain the first corresponding relationship includes:

[0021] Controlling the engine speed of the engine to obtain an engine parameter corresponding to any one of the at least one engine speed, wherein the engine parameter includes air-fuel ratio, fuel consumption, power, and pressure;

[0022] The exhaust flow rate is calculated according to the fuel consumption, the power and the air-fuel ratio to obtain the exhaust flow rate and pressure corresponding to any engine speed, so as to obtain the first corresponding relationship.

[0023] According to another aspect of the present disclosure, a transmission loss test system for a muffler element is provided, comprising: a transmission loss test bench, an angle adjustment device and a control device; wherein:

[0024] The transmission loss test bench is used to perform a sound transmission loss test on the muffler element;

[0025] The angle adjustment device is used to adjust the opening angle of the tuning valve of the muffler element;

[0026] The control device is used to calculate a second corresponding relationship between the engine speed and the opening angle of the tuning valve at different engine speeds based on a first corresponding relationship between the engine speed and the exhaust flow rate generated by the engine; find the target opening angle of the tuning valve corresponding to the engine at the target speed from the second corresponding relationship; control the angle adjustment device to adjust the tuning valve to the target opening angle, and then control the transmission loss test bench to perform a sound transmission loss test on the silencer element to obtain a sound transmission loss test result of the silencer element at the target engine speed.

[0027] Optionally, the system further comprises an engine pedestal, wherein the engine pedestal comprises an engine; wherein,

[0028] When the engine is connected to the muffler element, the control device is further used to control the engine speed of the engine to obtain the first corresponding relationship.

[0029] Optionally, the transmission loss test bench comprises:

[0030] A first test tube, the first test tube comprising: a first tube body and a second tube body, one end of the second tube body is provided with a non-reflection end, one end of the muffler element is connected to an end of the second tube body away from the non-reflection end, the other end of the muffler element is connected to one end of the first tube body, and the tuning valve of the muffler element is located between the first tube body and the second tube body, and the power output end of the angle adjustment device is transmission-connected to the power input end of the valve;

[0031] A sound source, the sound source being arranged at an end of the first tube body away from the muffler element;

[0032] A sound detection unit, wherein a plurality of detection ends of the sound detection unit are respectively arranged on the first tube body and the second tube body.

[0033] Optionally, the angle adjustment device includes:

[0034] an execution unit, wherein the execution unit is arranged on the muffler element;

[0035] A shaft rod, one end of which is connected to the power output end of the execution unit, and the other end of which passes through the muffler element and is connected to the rotating shaft of the valve.

[0036] Optionally, the angle adjustment device includes:

[0037] A sleeve, wherein the sleeve is disposed on the muffler element and the sleeve penetrates into the muffler element;

[0038] A wear-resistant ring is arranged in the sleeve and rotatably sleeved on the shaft.

[0039] Optionally, the engine stand comprises:

[0040] a second test tube, one end of the second test tube being connected to the exhaust end of the engine, and one end of the muffler element of the muffler element being connected to an end of the second test tube away from the engine;

[0041] A pressure detection unit, wherein a detection end of the pressure detection unit is arranged in the second test tube.

[0042] Optionally, the engine stand further comprises:

[0043] A temperature detection unit, wherein a detection end of the temperature detection unit is arranged in the second test tube.

[0044] According to another aspect of the present disclosure, a muffler element transmission loss test system is provided, comprising:

[0045] at least one processor; and

[0046] a memory communicatively connected to the at least one processor; wherein,

[0047] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform any one of the methods described in the above aspect.

[0048] According to another aspect of the present disclosure, a non-transitory computer-readable storage medium storing computer instructions is provided, wherein the computer instructions are used to enable the computer to execute any one of the methods described in the above aspect.

[0049] According to another aspect of the present disclosure, a computer program product is provided, including a computer program, wherein when the computer program is executed by a processor, the computer program implements any one of the methods described in the aforementioned aspect.

[0050] In one or more embodiments of the present disclosure, the muffler element includes a tuning valve for adjusting the noise reduction effect, and the second corresponding relationship between the engine speed and the opening angle of the tuning valve at different engine speeds is calculated according to the first corresponding relationship between the engine speed and the exhaust flow rate generated by the engine; the target opening angle of the tuning valve corresponding to the engine at the target speed is found from the second corresponding relationship; after the tuning valve is adjusted to the target opening angle, a sound transmission loss test is performed on the muffler element to obtain the sound transmission loss test result of the muffler element at the target engine speed. Therefore, by determining the second corresponding relationship between the engine speed and the opening angle of the tuning valve, when performing the sound transmission loss test on the muffler element, the target opening angle of the tuning valve corresponding to the engine at the target speed can be found through the second corresponding relationship, so that the transmission loss test can be performed on the muffler element to be tested according to the valve angle at different engine speeds, so as to improve the accuracy of the transmission loss test result of the muffler element.

[0051] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings are used to better understand the present solution and do not constitute a limitation of the present disclosure.

[0053] Figure 1 A schematic diagram of the structure of a conventional muffler element transmission loss test bench provided by an embodiment of the present disclosure is shown;

[0054] Figure 2 A schematic diagram showing a flow chart of a method for testing transmission loss of a muffler element provided by an embodiment of the present disclosure;

[0055] Figure 3 A schematic diagram showing a flow chart of another method for testing transmission loss of a muffler element provided by an embodiment of the present disclosure;

[0056] Figure 4 A schematic structural diagram of a transmission loss test system for a muffler element provided by an embodiment of the present disclosure is shown;

[0057] Figure 5 A schematic structural diagram of a transmission loss test bench provided by an embodiment of the present disclosure is shown;

[0058] Figure 6 A schematic structural diagram of an engine stand provided by an embodiment of the present disclosure is shown;

[0059] Figure 7 A schematic diagram showing a flow chart of another method for testing transmission loss of a muffler element provided by an embodiment of the present disclosure;

[0060] Figure 8 It is a block diagram of a noise reduction element transmission loss testing system used to implement the noise reduction element transmission loss testing method of the embodiment of the present disclosure. DETAILED DESCRIPTION

[0061] The following is a description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0062] As the vehicle configuration becomes more and more functional, the layout of the vehicle, especially the chassis layout, becomes more and more complex. As a solution to the insufficient volume of the exhaust muffler, the tuning valve has gradually been installed on traditional fuel vehicles and hybrid vehicles. Specifically, the tuning valve is installed in the vehicle exhaust muffler, and the muffler back pressure is controlled by changing the valve opening, which can achieve the change of the muffler noise reduction performance.

[0063] Figure 1 FIG. 1 is a schematic diagram of the structure of an existing transmission loss test bench for muffler elements provided by an embodiment of the present disclosure. Figure 1 As shown, the existing muffler element transmission loss test bench includes a loudspeaker 1, three microphones 2, an upstream pipe 3, a muffler element 4, a downstream pipe 5, a non-reflective end 6, an amplifier 7, and a data acquisition front end 8.

[0064] It is easy to understand that Figure 1 As shown, when the transmission loss test of the silencer element is performed using the existing silencer element transmission loss test bench, the valve angle of the silencer element cannot be adjusted, that is, the valve of the silencer element will always maintain the initial state (generally a closed state), and thus it is difficult to perform transmission loss tests on silencer elements with different valve angles, resulting in low accuracy of the transmission loss test results of the silencer element.

[0065] The present disclosure is described in detail below with reference to specific embodiments.

[0066] In the first embodiment, if Figure 2 As shown, Figure 2 A schematic flow chart of a method for testing transmission loss of a noise reduction element provided by an embodiment of the present disclosure is shown. The method can be executed by a system for testing transmission loss of a noise reduction element.

[0067] Specifically, the transmission loss test method of the muffler element includes:

[0068] S101, calculating a second corresponding relationship between the engine speed and the opening angle of the tuning valve at different engine speeds according to a first corresponding relationship between the engine speed and the exhaust flow rate generated by the engine;

[0069] According to some embodiments, the muffler element includes a tuning valve for adjusting the noise reduction effect. The tuning valve may be, for example, a passive valve. The muffler element refers to a muffler element with a valve that needs to be tested for transmission loss.

[0070] In some embodiments, the tuning valve opening angle refers to the opening angle of the tuning valve.

[0071] According to some embodiments, the exhaust flow rate is used to indicate the ability to deliver all air and mixed gas to all cylinders in a certain cycle of the engine, and can also refer to the flow rate of gas that can be discharged from one piston from one stroke to another. The exhaust flow rate changes with the change of the engine speed.

[0072] It is easy to understand that when the silencer element transmission loss test system performs the silencer element transmission loss test, the silencer element transmission loss test system can calculate the second corresponding relationship between the engine speed and the opening angle of the tuning valve at different engine speeds based on the first corresponding relationship between the engine speed and the exhaust flow generated by the engine.

[0073] S102, searching the target opening angle of the tuning valve corresponding to the target speed of the engine from the second corresponding relationship;

[0074] According to some embodiments, the target speed is used to indicate the engine speed at which to perform a transmission loss test on the muffler element.

[0075] In some embodiments, the target opening angle of the tuning valve refers to the opening angle of the tuning valve corresponding to the target rotation speed.

[0076] It is easy to understand that when the silencer element transmission loss test system obtains the second corresponding relationship between the tuning valve opening angle at different engine speeds, the silencer element transmission loss test system can find the tuning valve target opening angle corresponding to the engine at the target speed from the second corresponding relationship.

[0077] S103, after adjusting the tuning valve to a target opening angle, performing a sound transmission loss test on the muffler element to obtain a sound transmission loss test result of the muffler element at a target engine speed.

[0078] According to some embodiments, when the sound transmission loss testing system performs a sound transmission loss test on a sound transmission loss component, the sound transmission loss testing method includes but is not limited to a sound wave decomposition method, a two-load method, a two-sound source method, and the like.

[0079] In some embodiments, the sound transmission loss performance test result may be, for example, a sound transmission loss performance curve.

[0080] It is easy to understand that when the silencer element transmission loss test system obtains the target opening angle of the tuning valve, the silencer element transmission loss test system can adjust the tuning valve to the target opening angle and then perform a sound transmission loss test on the silencer element to obtain the sound transmission loss test result of the silencer element at the target engine speed.

[0081] In summary, the method provided by the embodiment of the present disclosure calculates the second corresponding relationship between the engine speed and the opening angle of the tuning valve at different engine speeds according to the first corresponding relationship between the engine speed and the exhaust flow rate generated by the engine; searches for the target opening angle of the tuning valve corresponding to the engine at the target speed from the second corresponding relationship; and performs a sound transmission loss test on the muffler element after adjusting the tuning valve to the target opening angle to obtain the sound transmission loss test result of the muffler element at the target engine speed. Therefore, by determining the second corresponding relationship between the engine speed and the opening angle of the tuning valve at different engine speeds, when performing a sound transmission loss test on the muffler element, the target opening angle of the tuning valve corresponding to the engine at the target speed can be searched through the second corresponding relationship, so that the transmission loss test can be performed on the muffler element to be tested according to the valve angle at different engine speeds, so as to improve the accuracy of the transmission loss test result of the muffler element.

[0082] See also Figure 3 , Figure 3 A schematic flow chart of a method for testing transmission loss of a muffler element provided by an embodiment of the present disclosure is shown. The method for testing transmission loss of a muffler element can be executed by a muffler element transmission loss testing system.

[0083] Specifically, the transmission loss test method of the muffler element includes:

[0084] S201, when the muffler element is connected to the engine, controlling the engine speed of the engine to obtain a first corresponding relationship;

[0085] According to some embodiments, when the engine speed of the engine is controlled to obtain the first corresponding relationship, first, the engine speed of the engine can be controlled to obtain at least one engine parameter corresponding to the engine speed. Then, the exhaust flow rate is calculated based on the fuel consumption, power and air-fuel ratio to obtain the exhaust flow rate and pressure corresponding to any engine speed, so as to obtain the first corresponding relationship between the exhaust flow rate and the pressure. Therefore, the accuracy of obtaining the first corresponding relationship can be improved.

[0086] In some embodiments, the engine parameters refer to the operating parameters of the engine when it is in a working state, and the engine parameters include but are not limited to air-fuel ratio, fuel consumption, power, pressure, etc.

[0087] According to some embodiments, the exhaust flow rate at any engine speed may be determined according to the following formula:

[0088] Exhaust flow rate = fuel consumption × power × (air-fuel ratio + 1)

[0089] Therefore, the exhaust flow and pressure corresponding to any one of at least one engine speed can be obtained, that is, the first corresponding relationship between the engine speed and the exhaust flow generated by the engine.

[0090] In some embodiments, the first corresponding relationship may be, for example, a first exhaust flow and pressure curve corresponding to at least one engine speed.

[0091] According to some embodiments, when the engine speed of the engine is controlled and the first corresponding relationship is obtained, the temperature of the measuring point corresponding to the muffler element can also be detected; when the temperature of the measuring point meets the temperature requirement, the engine speed of the engine is controlled to obtain the first corresponding relationship between the exhaust flow rate and the pressure. Therefore, the situation where the exhaust flow rate and the pressure are deviated due to the temperature can be reduced, and the accuracy of obtaining the first corresponding relationship can be improved.

[0092] In some embodiments, the measuring point temperature refers to the temperature at a testing point disposed near the muffler element.

[0093] In some embodiments, the temperature requirement refers to the requirement used when determining whether the engine speed of the engine can be controlled. The temperature requirement can be, for example, that the temperature of the measuring point is lower than a temperature threshold. The temperature threshold can be set according to actual conditions.

[0094] It is easy to understand that when the silencer element transmission loss test system performs the silencer element transmission loss test, the silencer element transmission loss test system can control the engine speed of the engine when the silencer element is connected to the engine to obtain the first corresponding relationship.

[0095] S202, performing simulation calculation on at least one type of reducer pipe of pipe diameter to obtain a third corresponding relationship set;

[0096] According to some embodiments, when performing simulation calculation on a reducer of at least one diameter, the simulation software used may be, for example, GT simulation software.

[0097] In some embodiments, the pipe diameter refers to the diameter of the reducer, and the range of the pipe diameter may be, for example, 10 mm to 40 mm.

[0098] According to some embodiments, the third correspondence set includes at least one third correspondence between exhaust flow and pressure. The third correspondence corresponds to the pipe diameter and the opening angle of the tuning valve. The third correspondence can be, for example, a second exhaust flow and pressure curve. In this case, the third correspondence set is a second exhaust flow and pressure curve set.

[0099] It is easy to understand that when the silencer element transmission loss test system performs a silencer element transmission loss test, the silencer element transmission loss test system can perform simulation calculations on at least one diameter reducer to obtain a third set of corresponding relationships.

[0100] S203, fitting the first corresponding relationship between the engine speed and the exhaust flow rate generated by the engine and the third corresponding relationship set to obtain a second corresponding relationship between the engine speed and the opening angle of the tuning valve at different engine speeds;

[0101] According to some embodiments, when fitting the first correspondence relationship between the engine speed and the exhaust flow rate generated by the engine and the third correspondence relationship set, first, the first correspondence relationship and the third correspondence relationship set can be fitted with pipe diameters to obtain a fourth correspondence relationship between pipe diameters and different engine speeds. Then, the fourth correspondence relationship and the fifth correspondence relationship between pipe diameters and the opening angle of the tuning valve can be fitted with opening degrees to obtain a second correspondence relationship between the engine at different speeds and the opening angle of the tuning valve. Therefore, the accuracy of the calculation of the second correspondence relationship can be improved.

[0102] In some embodiments, when fitting the pipe diameter for the first correspondence relationship and the third correspondence relationship set, for example, the first exhaust flow and pressure curve and the second exhaust flow and pressure curve set can be plotted in the same coordinate system, the intersection between the first exhaust flow and pressure curve and any second exhaust flow and pressure curve in the second exhaust flow and pressure curve set is obtained, and the sixth correspondence between the pipe diameter and the exhaust flow is obtained according to the pipe diameter, pressure, and exhaust flow corresponding to the intersection. According to the sixth correspondence relationship and the first correspondence relationship, the fourth correspondence relationship between the pipe diameter and different engine speeds can be obtained, wherein the pipe diameter corresponds to the engine speed one by one.

[0103] According to some embodiments, the equivalent pipe diameter corresponding to any tuning valve opening angle of the muffler element may be determined based on the structural parameters of the muffler element, thereby obtaining a fifth corresponding relationship between the pipe diameter and the tuning valve opening angle.

[0104] Taking a scenario as an example, Table (1) shows the corresponding relationship between exhaust flow, pressure, pipe diameter, and valve angle.

[0105]

[0106] Table (1)

[0107] As shown in Table (1), after fitting the first correspondence relationship and the second correspondence relationship set by pipe diameter, a sixth correspondence relationship between pipe diameter and exhaust flow rate can be obtained, and specifically, the exhaust flow rate and pressure corresponding to any pipe diameter of at least one pipe diameter can be obtained.

[0108] It is easy to understand that when the silencer element transmission loss test system obtains the first correspondence relationship and the third correspondence relationship set, the silencer element transmission loss test system can fit the first correspondence relationship and the third correspondence relationship set to obtain the second correspondence relationship between the engine speed and the tuning valve opening angle at different speeds.

[0109] S204, searching the target opening angle of the tuning valve corresponding to the target speed of the engine from the second corresponding relationship;

[0110] According to some embodiments, the target speed may be determined based on previous development experience or vehicle and exhaust NVH (NoiseVibrationHarshness) actual vehicle testing issues. The target speed may be, for example, 1000 rpm.

[0111] For example, when the sound transmission loss performance of the muffler element at 1000 rpm needs to be tested, first, the target exhaust flow rate corresponding to 1000 rpm can be found through the speed and exhaust flow rate curve. Then, the target opening angle of the tuning valve corresponding to the target exhaust flow rate can be found through Table (1).

[0112] It is easy to understand that when the muffler element transmission loss test system obtains the second corresponding relationship, the muffler element transmission loss test system can find the target opening angle of the tuning valve corresponding to the target speed of the engine from the second corresponding relationship.

[0113] S205, after adjusting the tuning valve to the target opening angle, a sound transmission loss test is performed on the muffler element to obtain a sound transmission loss test result of the muffler element at the target engine speed.

[0114] According to some embodiments, after obtaining the sound transmission loss performance test result of the muffler element at the target engine speed, if it is necessary to continue testing the sound transmission loss performance test result at other engine speeds, steps S204 to S205 can be repeated.

[0115] In summary, the method provided by the embodiment of the present disclosure firstly controls the engine speed of the engine when the muffler element is connected to the engine to obtain a first correspondence relationship; performs simulation calculation on a reducer of at least one diameter to obtain a third correspondence relationship set; therefore, the accuracy of obtaining the first correspondence relationship and the third correspondence relationship set can be improved. Then, by fitting the first correspondence relationship between the engine speed and the exhaust flow rate generated by the engine and the third correspondence relationship set, a second correspondence relationship between the engine speed and the opening angle of the tuning valve at different speeds is obtained; therefore, the accuracy of calculating the second correspondence relationship can be improved. Finally, by finding the target opening angle of the tuning valve corresponding to the engine at the target speed from the second corresponding relationship; after adjusting the tuning valve to the target opening angle, the sound transmission loss test of the muffler element is performed to obtain the sound transmission loss test result of the muffler element at the target speed of the engine; therefore, by determining the second corresponding relationship between the tuning valve opening angle at different engine speeds, when performing the sound transmission loss test on the muffler element, the target opening angle of the tuning valve corresponding to the engine at the target speed can be found through the second corresponding relationship, so that the transmission loss test of the muffler element to be tested can be performed according to the valve angle at different engine speeds, which can improve the accuracy of the transmission loss test results of the muffler element at different engine speeds. At the same time, in the stage of vehicle exhaust acoustic tuning and problem optimization, it can be convenient for staff to quickly analyze component performance defects and lock solutions based on the transmission loss performance test results at different engine speeds, which can shorten the vehicle exhaust NVH development cycle, improve development efficiency, reduce the risk of NVH failure to meet standards, and save the test development cost of multiple rounds of NVH tuning.

[0116] The following are system embodiments of the present disclosure, which can be used to execute the method embodiments of the present disclosure. For details not disclosed in the system embodiments of the present disclosure, please refer to the method embodiments of the present disclosure.

[0117] See also Figure 4 , which shows a schematic diagram of the structure of a transmission loss test system for a muffler element provided by an embodiment of the present disclosure. The transmission loss test system for a muffler element can be implemented as all or part of a system through software, hardware, or a combination of both. The transmission loss test system for a muffler element includes a transmission loss test bench, an angle adjustment device, and a control device, wherein:

[0118] Transmission loss test bench, used to test the sound transmission loss of the muffler components;

[0119] An angle adjustment device, used to adjust the opening angle of the tuning valve of the muffler element;

[0120] The control device is used to calculate a second corresponding relationship between the engine speed and the opening angle of the tuning valve at different engine speeds according to a first corresponding relationship between the engine speed and the exhaust flow rate generated by the engine; find the target opening angle of the tuning valve corresponding to the engine at the target speed from the second corresponding relationship; control the angle adjustment device to adjust the tuning valve to the target opening angle, and then control the transmission loss test bench to perform a sound transmission loss test on the silencer element to obtain the sound transmission loss test result of the silencer element at the target engine speed.

[0121] Optional, such as Figure 4 As shown, the muffler element transmission loss test system also includes an engine bench, and the engine bench includes an engine; wherein,

[0122] When the engine is connected to the muffler element, the control device is also used to control the engine speed of the engine to obtain the first corresponding relationship.

[0123] According to some embodiments, the control device may include, for example, a motor controller, and the motor controller is used to control the engine speed of the engine.

[0124] Optional, Figure 5 FIG. 2 is a schematic diagram showing the structure of a transmission loss test bench provided by an embodiment of the present disclosure. Figure 5 As shown, the transmission loss test bench includes:

[0125] A first test tube, the first test tube comprises: a first tube body 30 and a second tube body 50, one end of the second tube body 50 is provided with a non-reflection end 60, one end of the muffler element 40 of the muffler element is connected to an end of the second tube body 50 away from the non-reflection end 60, the other end of the muffler element is connected to one end of the first tube body 30, and the tuning valve 11 of the muffler element is located between the first tube body 30 and the second tube body 50, and the power output end of the angle adjustment device is transmission-connected to the power input end of the valve 11;

[0126] A sound source 10, which is disposed at one end of the first tube body 30 away from the muffler element 40;

[0127] The sound detection unit 80 has a plurality of detection ends 20 disposed on the first tube body 30 and the second tube body 50 respectively.

[0128] According to some embodiments, Figure 5As shown, the transmission loss test bench further includes an amplifier 70, the input end of the amplifier 70 is connected to the sound detection unit 80, and the output end of the amplifier 70 is connected to the input end of the sound source 10. At this time, the sound detection unit 80 can output the sound source signal to the amplifier 70. Then, the amplifier 70 amplifies the sound source signal and inputs the amplified sound source signal to the sound source 10 to drive the sound source 10 to work.

[0129] Optional, such as Figure 5 As shown, the angle adjustment device is installed in the muffler element, and the transmission loss test bench is connected to the muffler element installed with the angle adjustment device. The angle adjustment device includes:

[0130] An execution unit 14, the execution unit 14 is arranged on the muffler element 40;

[0131] The shaft rod 12 has one end connected to the power output end of the execution unit 14 , and the other end of the shaft rod 12 passes through the muffler element 40 and is connected to the rotating shaft of the valve 11 .

[0132] According to some embodiments, the execution unit 14 may be, for example, an execution motor.

[0133] In some embodiments, the rotating shaft of the valve 11 may be, for example, a valve cover rotating shaft of a tuning valve.

[0134] Optional, such as Figure 5 As shown, the angle adjustment device further includes a sealing assembly 13, and the sealing assembly 13 includes:

[0135] A sleeve, which is disposed on the muffler element 40 and penetrates into the muffler element 40;

[0136] The wear-resistant ring is arranged in the sleeve 13 and is rotatably sleeved on the shaft 12 .

[0137] According to some embodiments, the sleeve may be, for example, a metal sleeve, and the wear-resistant ring may be, for example, a ceramic ring.

[0138] In some embodiments, the angle adjustment device can be installed in the muffler element by drilling holes on the shell surface of the muffler element 40 and welding the sealing assembly 13 to allow the shaft 12 to pass through the shell of the muffler element 40 to connect the actuator 14 and the rotating shaft of the valve 11. Figure 6 FIG. 2 is a schematic diagram showing the structure of an engine stand provided by an embodiment of the present disclosure. Figure 6 As shown, the engine stand includes:

[0139] A second test tube 41, one end of the second test tube 41 is connected to the exhaust end of the engine 42, and one end of the silencer element 40 of the silencer element is connected to the end of the second test tube 41 away from the engine 42;

[0140] The pressure detection unit 43 has a detection end disposed in the second test tube 41 .

[0141] According to some embodiments, the pressure detection unit 43 may be used to obtain a pressure corresponding to any one of at least one engine speed. The pressure refers to the back pressure of the second test pipe 41 .

[0142] Optional, such as Figure 6 As shown, the engine stand also includes:

[0143] The temperature detection unit 44 has a detection end disposed in the second test tube 41 .

[0144] According to some embodiments, a detection end of the temperature detection unit 44 is connected to a measurement point disposed in the second test tube 41 for detecting the temperature of the measurement point.

[0145] It should be noted that the control unit is used to calculate the second corresponding relationship between the engine speed and the opening angle of the tuning valve at different engine speeds based on the first corresponding relationship between the engine speed and the exhaust flow generated by the engine; to find the target opening angle of the tuning valve corresponding to the engine at the target speed from the second corresponding relationship; after controlling the angle adjustment device to adjust the tuning valve to the target opening angle, the transmission loss test bench is controlled to perform a sound transmission loss test on the silencer element, and the sound transmission loss test result of the silencer element at the target engine speed is obtained. The specific steps are shown in S201 to S205, which will not be repeated here.

[0146] Take a scenario as an example. Figure 7 FIG. 1 is a flow chart showing a method for testing transmission loss of a muffler element provided by an embodiment of the present disclosure. Figure 7 As shown, first, the silencer element is connected to the engine test bench, and the engine test bench is controlled to perform a tuning valve test on the silencer element. The exhaust flow rate is calculated according to the test results to obtain the exhaust flow rate and back pressure (pressure) fitting curve. Next, the pipe diameter is fitted according to the reducer simulation results and the exhaust flow rate and back pressure fitting curve to obtain the exhaust flow rate and pipe diameter fitting curve, and the exhaust flow rate and opening (tuning valve opening angle) fitting curve is determined according to the exhaust flow rate and pipe diameter fitting curve. Secondly, the silencer element is modified, the angle adjustment device is added to the silencer element, and the transmission loss test bench is mounted. At the same time, the test speed (engine target speed) and the target exhaust flow rate are determined, and the valve angle is controlled according to the target exhaust flow rate. Finally, the transmission loss test bench is controlled to perform a transmission loss test on the silencer element to obtain the transmission loss test results.

[0147] It should be noted that if Figure 4As shown, the modules that must be included in the silencer element transmission loss test system are indicated by solid-line frames, such as the transmission loss test bench, the angle adjustment device, and the control device; the modules that may or may not be included in the silencer element transmission loss test system are indicated by dotted-line frames, such as the engine bench.

[0148] It should be noted that the transmission loss test system for silencer components provided in the above embodiment only uses the division of the above functional modules as an example when executing the transmission loss test method for silencer components. In actual applications, the above functional distribution can be completed by different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the transmission loss test system for silencer components provided in the above embodiment and the transmission loss test method embodiment for silencer components belong to the same concept, and the implementation process thereof is detailed in the method embodiment, which will not be repeated here.

[0149] In summary, the system provided by the embodiment of the present disclosure includes a transmission loss test bench, an angle adjustment device and a control device; wherein the transmission loss test bench is used to perform a sound transmission loss test on a silencer element; the angle adjustment device is used to adjust the opening angle of a tuning valve of the silencer element; the control device is used to calculate a second corresponding relationship between the engine speed and the opening angle of the tuning valve at different engine speeds based on a first corresponding relationship between the engine speed and the exhaust flow generated by the engine; from the second corresponding relationship, find the target opening angle of the tuning valve corresponding to the engine at the target speed; after controlling the angle adjustment device to adjust the tuning valve to the target opening angle, control the transmission loss test bench to perform a sound transmission loss test on the silencer element to obtain the sound transmission loss test result of the silencer element at the target engine speed. Therefore, by determining the second corresponding relationship between the opening angle of the tuning valve at different engine speeds, when performing a sound transmission loss test on the silencer element, the target opening angle of the tuning valve corresponding to the engine at the target speed can be found through the second corresponding relationship, so that the transmission loss test of the silencer element to be tested can be performed according to the valve angle at different engine speeds, which can improve the accuracy of the transmission loss test results of the silencer element at different engine speeds, so that the staff can analyze and match the silencer element to be tested according to the transmission loss performance test results at different engine speeds, shorten the vehicle development cycle, reduce the risk of transmission loss not meeting the standard, and save test development costs.

[0150] In the technical solution of the present disclosure, the collection, storage, use, processing, transmission, provision and disclosure of user personal information involved are in compliance with the provisions of relevant laws and regulations and do not violate public order and good morals.

[0151] According to an embodiment of the present disclosure, the present disclosure also provides a noise reduction element transmission loss test system, a readable storage medium, and a computer program product.

[0152] Figure 8 A schematic block diagram of an example muffler element transmission loss test system 800 that may be used to implement embodiments of the present disclosure is shown. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit implementations of the present disclosure described and / or claimed herein.

[0153] like Figure 8 As shown, the muffler transmission loss test system 800 includes a computing unit 801, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 802 or a computer program loaded from a storage unit 808 into a random access memory (RAM) 803. In the RAM 803, various programs and data required for the operation of the muffler transmission loss test system 800 can also be stored. The computing unit 801, the ROM 802, and the RAM 803 are connected to each other via a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0154] Multiple components in the anechoic element transmission loss test system 800 are connected to the I / O interface 805, including: an input unit 806, such as a keyboard, a mouse, etc.; an output unit 807, such as various types of displays, speakers, etc.; a storage unit 808, such as a disk, an optical disk, etc.; and a communication unit 809, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 809 allows the anechoic element transmission loss test system 800 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0155] The computing unit 801 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 801 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 801 performs the various methods and processes described above, such as the muffler element transmission loss test method. For example, in some embodiments, the muffler element transmission loss test method may be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as a storage unit 808. In some embodiments, part or all of the computer program may be loaded and / or installed on the muffler element transmission loss test system 800 via the ROM 802 and / or the communication unit 809. When the computer program is loaded into the RAM 803 and executed by the computing unit 801, one or more steps of the muffler element transmission loss test method described above may be performed. Alternatively, in other embodiments, the computing unit 801 may be configured to execute the muffler element transmission loss test method in any other appropriate manner (eg, by means of firmware).

[0156] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0157] The program code for implementing the method of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the program code, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The program code may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0158] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0159] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the computer. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0160] The systems and techniques described herein can be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), the Internet, and a blockchain network.

[0161] A computer system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The relationship between the client and the server is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services ("Virtual Private Server", or "VPS" for short). The server may also be a server of a distributed system, or a server combined with a blockchain.

[0162] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

[0163] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A method for testing the sound transmission loss of a muffler component, characterized in that: The muffler element includes a tuning valve for adjusting the noise reduction effect, and the method includes: According to the first corresponding relationship between the engine speed and the exhaust flow rate generated by the engine, a second corresponding relationship between the engine speed and the opening angle of the tuning valve at different engine speeds is calculated; Finding the target opening angle of the tuning valve corresponding to the target speed of the engine from the second corresponding relationship; After the tuning valve is adjusted to the target opening angle, a sound transmission loss test is performed on the silencer element to obtain a sound transmission loss test result of the silencer element at a target engine speed.

2. The method according to claim 1, characterized in that: The calculating, based on the first corresponding relationship between the engine speed and the exhaust flow rate generated by the engine, the second corresponding relationship between the engine speed and the opening angle of the tuning valve at different engine speeds comprises: The first correspondence relationship between the engine speed and the exhaust flow rate generated by the engine and the third correspondence relationship set are fitted to obtain a second correspondence relationship between the engine speed and the opening angle of the tuning valve at different engine speeds, wherein the first correspondence relationship includes the exhaust flow rate and pressure corresponding to any engine speed of at least one engine speed, and the third correspondence relationship set includes a third correspondence between at least one exhaust flow rate and pressure, and the third correspondence relationship has a one-to-one correspondence with the opening angle of the tuning valve.

3. The method according to claim 2, characterized in that Before fitting the first correspondence relationship and the third correspondence relationship set between the engine speed and the exhaust flow rate generated by the engine, the method further includes: When the muffler element is connected to an engine, the engine speed of the engine is controlled to obtain the first corresponding relationship; A simulation calculation is performed on a reducer of at least one diameter to obtain the third corresponding relationship set, wherein the third corresponding relationship corresponds to the diameter of the tube one-to-one, and the diameter of the tube corresponds to the opening angle of the tuning valve one-to-one.

4. The method according to claim 3, characterized in that The fitting of the first correspondence relationship between the engine speed and the exhaust flow rate generated by the engine and the third correspondence relationship set to obtain the second correspondence relationship between the engine speed and the opening angle of the tuning valve at different engine speeds includes: Performing pipe diameter fitting on the first corresponding relationship and the third corresponding relationship set to obtain a fourth corresponding relationship between the pipe diameter and different engine speeds, wherein the pipe diameter corresponds to the engine speed in a one-to-one manner; The fourth corresponding relationship and the fifth corresponding relationship between the pipe diameter and the opening angle of the tuning valve are fitted to obtain a second corresponding relationship between the engine at different speeds and the opening angle of the tuning valve.

5. The method according to claim 3, characterized in that: The controlling the engine speed of the engine to obtain the first corresponding relationship includes: Detecting the temperature of the measuring point corresponding to the muffler element; When the temperature at the measuring point meets the temperature requirement, the engine speed of the engine is controlled to obtain the first corresponding relationship.

6. The method according to claim 3, characterized in that The controlling the engine speed of the engine to obtain the first corresponding relationship includes: Controlling the engine speed of the engine to obtain an engine parameter corresponding to any one of the at least one engine speed, wherein the engine parameter includes air-fuel ratio, fuel consumption, power, and pressure; The exhaust flow rate is calculated according to the fuel consumption, the power and the air-fuel ratio to obtain the exhaust flow rate and pressure corresponding to any engine speed, so as to obtain the first corresponding relationship.

7. A transmission loss test system for a muffler element, characterized in that: include: Transmission loss test bench and angle adjustment device and control device; wherein, The transmission loss test bench is used to perform a sound transmission loss test on the muffler element; The angle adjustment device is used to adjust the opening angle of the tuning valve of the muffler element; The control device is used to calculate a second corresponding relationship between the engine speed and the opening angle of the tuning valve at different engine speeds based on a first corresponding relationship between the engine speed and the exhaust flow rate generated by the engine; find the target opening angle of the tuning valve corresponding to the engine at the target speed from the second corresponding relationship; control the angle adjustment device to adjust the tuning valve to the target opening angle, and then control the transmission loss test bench to perform a sound transmission loss test on the silencer element to obtain a sound transmission loss test result of the silencer element at the target engine speed.

8. The transmission loss test system for muffler elements according to claim 7, characterized in that: The system further includes an engine pedestal, the engine pedestal including an engine; wherein, When the engine is connected to the muffler element, the control device is further used to control the engine speed of the engine to obtain the first corresponding relationship.

9. The transmission loss test system for muffler elements according to claim 7, characterized in that: The transmission loss test bench comprises: A first test tube, the first test tube comprising: a first tube body and a second tube body, one end of the second tube body is provided with a non-reflection end, one end of the muffler element is connected to an end of the second tube body away from the non-reflection end, the other end of the muffler element is connected to one end of the first tube body, and the tuning valve of the muffler element is located between the first tube body and the second tube body, and the power output end of the angle adjustment device is transmission-connected to the power input end of the valve; A sound source, the sound source being arranged at an end of the first tube body away from the muffler element; A sound detection unit, wherein a plurality of detection ends of the sound detection unit are respectively arranged on the first tube body and the second tube body.

10. The transmission loss test system of the muffler element according to claim 9, characterized in that: The angle adjustment device comprises: an execution unit, wherein the execution unit is arranged on the muffler element; A shaft rod, one end of which is connected to the power output end of the execution unit, and the other end of which passes through the muffler element and is connected to the rotating shaft of the valve.

11. The transmission loss test system of the muffler element according to claim 10, characterized in that: The angle adjustment device comprises: A sleeve, wherein the sleeve is disposed on the muffler element and the sleeve penetrates into the muffler element; A wear-resistant ring is arranged in the sleeve and rotatably sleeved on the shaft.

12. The transmission loss test system of the muffler element according to claim 8, characterized in that: The engine stand comprises: a second test tube, one end of the second test tube being connected to the exhaust end of the engine, and one end of the muffler element of the muffler element being connected to an end of the second test tube away from the engine; A pressure detection unit, wherein a detection end of the pressure detection unit is arranged in the second test tube.

13. The transmission loss test system of the muffler element according to claim 12, characterized in that: The engine pedestal further comprises: A temperature detection unit, wherein a detection end of the temperature detection unit is arranged in the second test tube.

14. A transmission loss test system for a muffler element, comprising: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 6.

15. A non-transitory computer-readable storage medium storing computer instructions, wherein: The computer instructions are used to cause the computer to execute the method according to any one of claims 1 to 6.

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