Exhaust noise testing method, device, equipment and medium

Abstract

The invention discloses an exhaust noise testing method, device and equipment and a medium. The method comprises the steps that the current exhaust temperature of the idle speed of the whole vehicle is obtained; whether the current exhaust temperature meets a preset target exhaust temperature threshold value or not is judged; and if the current exhaust temperature meets the preset target exhaust temperature threshold value, the current exhaust noise of the idle speed of the whole vehicle is tested, and the result of the exhaust noise is extracted. According to the method, the temperature value is substituted into the exhaust model for simulation optimization, and the exhaust noise and the exhaust temperature are monitored at the same time, so that the idle exhaust noise of the whole vehicle is tested specifically, quickly and effectively, the accuracy of the exhaust noise test is realized, the goodness of fit between the exhaust noise simulation and the test is improved, and the test efficiency is improved. According to the method, the exhaust noise can be tested, the consistency of each exhaust noise test is ensured, the exhaust noise test time and cost are saved, the economical efficiency and the dynamic property of the vehicle are also considered, the overall noise level of the exhaust tail pipe is greatly reduced, and the vehicle use experience of a user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile noise reduction, and in particular to a method, device, equipment and medium for testing exhaust noise. Background Art

[0002] With the rapid development of the automobile industry, the overall performance of various types of automobiles has been rapidly improved, and customers have higher and higher requirements for automobile performance. The vibration and noise of the automobile at idle speed is the focus of the noise, vibration and harshness (NVH) performance of the whole vehicle. In particular, the abnormal noise at idle speed is the easiest for customers to perceive. Therefore, automobile exhaust noise has become an important indicator to measure vehicle performance.

[0003] At present, the existing exhaust tail noise test method uses a bench for testing, and does not collect the exhaust gas temperature during actual driving. It only tests the manifold temperature and the exhaust tail temperature, and does not monitor the exhaust gas temperature and exhaust noise synchronously in real time during the exhaust noise test. The higher the exhaust temperature, the smaller the low-frequency muffler (0-200Hz), so the exhaust noise is more affected by temperature. Therefore, it will cause a large difference in exhaust temperature during each exhaust noise test, resulting in large differences in multiple test results, and a large difference from the actual experience. During the test, the actual operating temperature inside the exhaust muffler under hot idle conditions will also be different from the simulation input temperature, resulting in the test results and the simulation results cannot correspond, affecting the simulation optimization. Therefore, how to improve the accuracy of exhaust noise testing and optimize the control of vehicle idle exhaust noise has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] Based on this, it is necessary to provide an exhaust noise testing method, device, equipment and medium to address the above technical problems, so as to solve the problem that the existing solutions cannot achieve how to improve the accuracy of exhaust noise testing and optimize the control of vehicle idle exhaust noise.

[0005] A first aspect of an embodiment of the present application provides a method for testing exhaust noise, the method comprising:

[0006] Get the current exhaust temperature of the vehicle at idle speed;

[0007] Determining whether the current exhaust temperature meets a preset target exhaust temperature threshold;

[0008] If the current exhaust temperature meets the preset target exhaust temperature threshold, the current exhaust noise of the vehicle at idle speed is tested and the exhaust noise result is extracted.

[0009] A second aspect of an embodiment of the present application provides an exhaust noise testing device, the exhaust noise testing device comprising:

[0010] The acquisition module is used to obtain the current exhaust temperature of the vehicle at idle speed;

[0011] A judgment module, used to judge whether the current exhaust temperature meets a preset target exhaust temperature threshold;

[0012] The test module is used to test the current exhaust noise of the vehicle at idle speed and extract the result of the exhaust noise if the current exhaust temperature meets the preset target exhaust temperature threshold.

[0013] In a third aspect, an embodiment of the present invention provides a computer device, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor implements the exhaust noise testing method as described in the first aspect when executing the computer program.

[0014] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and wherein the computer program, when executed by a processor, implements the exhaust noise testing method described in the first aspect.

[0015] In summary, the present invention provides a method, device, equipment and medium for testing exhaust noise. By obtaining the current exhaust temperature of the whole vehicle at idle speed, it is determined whether the current exhaust temperature meets the preset target exhaust temperature threshold. If the current exhaust temperature meets the preset target exhaust temperature threshold, the current exhaust noise of the whole vehicle at idle speed is tested, and the exhaust noise result is extracted. The present application uses the temperature value to bring into the exhaust model for simulation optimization, and monitors the exhaust noise and exhaust temperature simultaneously, so that it can be targeted and accurately predicted and optimized, and the whole vehicle idle exhaust noise is tested quickly and effectively, providing the accuracy of the exhaust noise test, while improving the consistency between the exhaust noise simulation and the test, and ensuring the consistency of each exhaust noise test, saving the exhaust noise test time and cost, and taking into account the vehicle's economy and power, thereby greatly reducing the overall noise level of the exhaust tail pipe and improving the user's car experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0017] Figure 1 is a structural installation diagram of a temperature sensor provided by an embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the exhaust temperature and exhaust noise test provided by one embodiment of the present invention;

[0019] Figure 3 It is a flow chart of a method for testing exhaust noise provided by one embodiment of the present invention;

[0020] Figure 4 It is a structural schematic diagram of an exhaust noise testing device provided by one embodiment of the present invention;

[0021] Figure 5 It is a structural schematic diagram of a computer device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0024] It should also be understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0025] As used in the present specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]", depending on the context.

[0026] In addition, in the description of the present specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0027] References to "one embodiment" or "some embodiments" etc. described in the present specification mean that one or more embodiments of the present invention include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0028] It should be understood that the order of execution of the steps in the following embodiments does not imply a precedence of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0029] The present invention provides a method, device, equipment and medium for testing exhaust noise. Through the design of tooling, multiple temperature sensors are simply installed on the exhaust muffler system. The road test identifies the temperature value of the front muffler / rear muffler of the hot idle exhaust. The temperature is brought into the exhaust model for simulation optimization, which can accurately predict and optimize, select the best sample of the simulation result to make a sample of the solution, improve the optimization efficiency, enhance the optimization effect, and save optimization time and cost. Then, in the anechoic chamber, the exhaust noise and exhaust temperature are monitored simultaneously under the state of the whole vehicle. When the exhaust temperature value meets the preset target exhaust temperature, the exhaust noise level at the fixed exhaust muffler temperature is accurately tested, the accuracy of the exhaust noise test is provided, and the consistency between the exhaust noise simulation and the test is improved, which can save the exhaust noise optimization time and cost, and evaluate the noise risk. This solves the problem that the existing solution cannot achieve how to improve the accuracy of the exhaust noise test and optimize the control of the vehicle idle exhaust noise.

[0030] It should be noted that the vehicles in the present invention include but are not limited to small cars, compact cars, mid-sized cars, and medium-to-large cars, etc., and are not specifically limited in the present invention.

[0031] In one embodiment, if Figure 1As shown, it is a structural installation diagram of the temperature sensor provided by an embodiment of the present invention. First, a temperature sensor installation tool is made, which includes a mounting bolt and a mounting nut. A hole is drilled at the inlet pipe of each muffler, and a temperature sensor fixing bolt is installed to ensure the sealing of the installation position. The temperature sensor is fixed on the fixing nut. A torque of 10N is used to completely screw the temperature sensor + fixing nut into the fixing bolt to ensure the sealing. That is, the mounting bolt is fixed at the inlet pipe of the muffler and the sealing is ensured. The mounting nut is connected to the temperature sensor, screwed into the bolt and tightened. A temperature sensor is installed at the front muffler inlet pipe and the rear muffler inlet pipe in the exhaust system, respectively, so as to fully obtain the temperature value of the front muffler / rear muffler of the hot idle exhaust in the road test to ensure the accuracy of the exhaust muffler temperature acquisition.

[0032] In one embodiment, if Figure 2 The figure shows a schematic diagram of the structure of the exhaust temperature and exhaust noise test provided by an embodiment of the present invention. Two temperature sensors are respectively arranged at the connection between the front exhaust muffler and the inlet pipe and at the connection between the rear exhaust muffler and the inlet pipe. The exhaust noise and exhaust temperature are monitored simultaneously in the whole vehicle state. The exhaust temperature of the front muffler or the rear muffler is collected by the temperature acquisition module. Then, at the current temperature, the noise of the noise sensor and the charge amplifier is collected to obtain the vibration noise signal of the exhaust system. The exhaust noise level of the hot engine idle exhaust tail port in the whole vehicle state of the scheme is tested by the test computer. Improving the consistency between the exhaust noise simulation and the test can save optimization time and cost. It effectively improves the transmission loss of the exhaust noise, thereby greatly reducing the overall noise level of the exhaust tail pipe, improving the comfort performance of the vehicle, and solving the problem of poor efficiency of the prior art in testing exhaust noise.

[0033] In this embodiment, the structure of the exhaust temperature and exhaust noise test is only for illustrative purposes. In other embodiments, the structure of the exhaust temperature and exhaust noise test may be other, which will not be described in detail here.

[0034] like Figure 3 FIG. 1 is a flow chart of a method for testing exhaust noise provided by an embodiment of the present invention. The method for testing exhaust noise may include the following steps:

[0035] S301: Obtain the current exhaust temperature of the vehicle at idle speed.

[0036] In step S301, the exhaust noise and exhaust temperature are monitored simultaneously in the whole vehicle state. The vehicle is fixed on the chassis dynamometer in the anechoic chamber, and the engine is accelerated to warm up the engine under simulated road driving conditions on the dynamometer. When the vehicle is idling, the gas temperature sensor display values ​​of the front muffler and the rear muffler reach the gas temperatures N1 and N2 under actual road conditions, and the exhaust noise is tested at the monitored temperature.

[0037] Optionally, before obtaining the current exhaust temperature of the vehicle at idle speed, the following steps are included:

[0038] Obtain the actual measured exhaust temperature value of the vehicle road test;

[0039] Based on the mapping relationship between the pre-calibrated exhaust temperature and exhaust noise, the actual measured exhaust temperature value is input into the simulation analysis model with a pre-set value to calculate the transmission loss value of the exhaust noise of the muffler to be tested;

[0040] Determining whether the transmission loss value meets a preset target transmission loss value;

[0041] Simulation optimization of exhaust noise transmission loss value of vehicle road test is determined based on the judgment results.

[0042] Specifically, the temperature value of the front muffler / rear muffler of the hot engine idle exhaust is obtained through the temperature sensor. On the road or test field, after completing 10 cycles of full throttle acceleration from 1500 to 4500rpm on a straight road, the gas temperature N in the exhaust muffler in this state is tested at idle speed. Two temperature sensors are arranged at the connection between the front muffler and the inlet pipe and the connection between the rear muffler and the inlet pipe, respectively. The temperature values ​​N1 and N2 obtained from the road test are substituted into the simulation model to calculate the transmission loss, and the transmission loss curve is obtained and compared with the target value. For example, the gas temperature of the front muffler inlet pipe is 310°C and the gas temperature of the rear muffler inlet pipe is 180°C. The temperature values ​​310°C and 180°C obtained from the road test are substituted into the simulation model to calculate the transmission loss. There may be multiple transmission loss values ​​obtained by acoustic simulation calculation of a muffler at a fixed temperature, and the multiple transmission loss values ​​constitute a transmission loss curve. A target transmission loss value is set in advance, and in the idle frequency range, it is determined whether the transmission loss value meets the preset target transmission loss value. Based on the judgment result, the simulation optimization of the exhaust noise transmission loss value of the whole vehicle road test is determined. The target transmission loss value preset in this application can be 10-20, or 20-30, etc., and this application does not impose any limitation on this.

[0043] Optionally, determining the simulation optimization of the exhaust noise transmission loss value of the vehicle road test based on the judgment result includes:

[0044] If the transmission loss value meets the preset target transmission loss value, the optimized exhaust noise transmission loss values ​​of the vehicle road test are sorted to determine the weight of the transmission loss value;

[0045] According to the weight of the transmission loss value, the optimal transmission loss value is used as the verification solution to produce samples, and the samples are installed on the actual vehicle to conduct the exhaust noise test at the idle speed of the whole vehicle and obtain the verification test results;

[0046] If the verification test results meet the development requirements, the exhaust noise test of the vehicle at idle speed is completed.

[0047] If the transmission loss value does not meet the preset target transmission loss value, the exhaust noise transmission loss value of the whole vehicle road test will continue to be optimized until the preset target transmission loss value is met.

[0048] Specifically, if the transmission loss values ​​calculated by the acoustic simulation of the muffler at a fixed temperature are 35, 20, 5, 15, and 18 respectively, determine whether the calculated transmission loss values ​​35, 20, 5, 15, and 18 meet the preset target transmission loss values ​​10-20, and determine that the calculated transmission loss values ​​20, 15, and 18 meet the preset target transmission loss values ​​10-20, then sort the exhaust noise transmission loss values ​​of the optimized whole vehicle road test, determine the weight of the transmission loss value, and prioritize them. The greater the weight, the higher the quality of the transmission loss value, and the closer the storage position is, that is, the exhaust noise transmission loss values ​​from high to low are 20, 18, and 15, then 20 is used as the optimal transmission loss value as a verification scheme for sample production, and the sample is mounted on a real vehicle to perform a whole vehicle idle exhaust noise test and obtain verification test results. If the verification test results meet the development requirements, the whole vehicle idle exhaust noise test is completed. If the calculated transmission loss values ​​35, 5 do not meet the preset target transmission loss values ​​10-20, the exhaust noise transmission loss value of the vehicle road test will continue to be optimized until it meets the preset target transmission loss value, and the verification test results meet the requirements or convergence is achieved. That is, the temperature values ​​N1 and N2 obtained from the road test are substituted into the simulation model to calculate the transmission loss. The transmission loss curve is obtained and compared with the target value. If it meets the requirements, a sample is made for verification. If the transmission loss does not meet the index requirements, the acoustic structure optimization is continued until it meets the requirements.

[0049] In an embodiment of the present invention, a temperature sensor is used to accurately test the road test to identify the temperature values ​​N1 and N2 of the front muffler / rear muffler of the hot idle exhaust, and then the actual temperature is substituted into the exhaust model for simulation optimization, which can improve the simulation accuracy and efficiency. In addition, the exhaust noise and exhaust temperature are monitored simultaneously in the whole vehicle state, in order to lay a good foundation for testing the exhaust noise level of the scheme under the exhaust temperature value later, improve the consistency between the exhaust noise simulation and the test, and save optimization time and cost. In addition, the test accuracy is improved, and the "muffler gas temperature" monitoring condition is added to ensure the consistency of each exhaust noise test in the anechoic chamber.

[0050] S302: Determine whether the current exhaust temperature meets a preset target exhaust temperature threshold.

[0051] In step S302, the current exhaust temperature of the vehicle at idle is obtained to determine whether the current exhaust temperature meets the preset target exhaust temperature threshold. If the current exhaust temperature meets the preset target exhaust temperature threshold, step S303 is executed to test the current exhaust noise of the vehicle at idle and extract the exhaust noise result. If the current exhaust temperature does not meet the preset target exhaust temperature threshold, the engine heat engine needs to be continuously debugged until the preset target exhaust temperature threshold is met, and then the current exhaust noise of the vehicle at idle is tested. That is to say, if the current exhaust temperature does not meet the preset target exhaust temperature threshold, the subsequent step of testing the current exhaust noise of the vehicle at idle will no longer be executed.

[0052] In a specific implementation, in this embodiment, the current exhaust temperature of the whole vehicle at idle speed can be compared with the preset target exhaust temperature threshold to determine whether the current exhaust temperature meets the preset target exhaust temperature threshold. If the current exhaust temperature meets the preset target exhaust temperature threshold, the current exhaust noise of the whole vehicle at idle speed is tested. If the current exhaust temperature does not meet the preset target exhaust temperature threshold, the current exhaust noise of the whole vehicle at idle speed will not be tested. For example, the current exhaust temperature of the whole vehicle at idle speed is 280°C and 110°C, 310°C and 180°C, and 420°C and 210°C, etc. The preset target exhaust temperature threshold can be 310°C and 180°C. Then, when the current exhaust temperature of the whole vehicle at idle speed is 310°C and 180°C, the preset target exhaust temperature threshold is met, while 280°C and 110°C and 420°C and 210°C do not meet the preset target exhaust temperature threshold.

[0053] It should be noted that the current exhaust temperature of the vehicle idling in the present invention can be 280°C and 110°C, 310°C and 180°C, 420°C and 210°C, etc., or other temperatures, and the preset target exhaust temperature threshold can be 310°C and 180°C, or other temperatures, etc., which are not specifically limited in the present invention.

[0054] In this embodiment, by judging whether the current exhaust temperature meets the preset target exhaust temperature threshold, a good foundation is laid for testing the current exhaust noise of the whole vehicle at idle speed, thereby improving the accuracy of the exhaust noise test and optimizing the control of the vehicle's idle exhaust noise.

[0055] S303: If the current exhaust temperature meets the preset target exhaust temperature threshold, the current exhaust noise of the vehicle at idle speed is tested and the exhaust noise result is extracted.

[0056] In step S303, the exhaust noise and exhaust temperature are monitored simultaneously under the whole vehicle state. When the current exhaust temperature obtained meets the preset target exhaust temperature threshold, the current exhaust noise of the whole vehicle at idle speed is tested and the exhaust noise result is extracted.

[0057] Optionally, the current exhaust noise of the vehicle at idle speed is tested, including:

[0058] Testing the current exhaust noise of the vehicle at idle speed, wherein the current exhaust noise includes N groups of exhaust noise;

[0059] Determining whether the N groups of exhaust noises are consistent;

[0060] If the N groups of exhaust noises remain consistent, determining whether each group of exhaust noises is less than a preset target exhaust noise value;

[0061] If each group of exhaust noise is less than a preset target exhaust noise value, it is determined that the current exhaust noise is qualified, and the result of the current exhaust noise is extracted.

[0062] Specifically, when the exhaust temperature meets the preset target exhaust temperature threshold, the exhaust noise microphone can be awakened to collect the process noise information in the exhaust tail of the vehicle at idle speed under different road environments after startup, such as the noise information data when the vehicle is idling on a smooth road or the noise information data when the vehicle is idling on an uneven road. These are the key exhaust tail noise generation stages, which effectively limit the range of measurement data acquisition and improve the accuracy of subsequent data. The specific content of the exhaust noise microphone sensor layout position is: the microphone is arranged at the horizontal position of the vehicle in the Z direction of the exhaust tail, the XY plane of the vehicle is 45°, and the distance is 500mm. Extract any time domain information data (such as noise information data in the time domain of ten seconds, twenty seconds, etc.) from the above noise information data and perform function windowing processing to obtain the processed windowing function information, so as to test the current exhaust noise of the vehicle at idle speed, so the current exhaust noise is extracted multiple times, including N groups of exhaust noise. Then determine whether the N groups of exhaust noise are consistent. If the N groups of exhaust noise are consistent, it is necessary to determine whether each group of exhaust noise is less than the preset target exhaust noise value. If the N groups of exhaust noise are inconsistent, the subsequent steps of testing the current exhaust noise of the vehicle at idle speed will no longer be performed. The specific content of multiple exhaust noise consistency confirmation is: because exhaust noise is greatly affected by temperature and is also affected by the engine combustion state, it is necessary to ensure that the difference in the exhaust noise test results of each N group is less than 0.5dB (A) in order to determine the consistency of exhaust noise multiple times.

[0063] In this embodiment, after determining that N groups of exhaust noises are consistent, it is determined whether each group of exhaust noises is less than a preset target exhaust noise value. If each group of exhaust noises is less than the preset target exhaust noise value, it is determined that the current exhaust noise is qualified, and the result of the current exhaust noise is extracted. If each group of exhaust noises is not less than the preset target exhaust noise value, it is determined that the current exhaust noise is unqualified, and the subsequent step of testing the current exhaust noise of the entire vehicle at idle speed will no longer be performed.

[0064] It should be noted that the preset target exhaust noise value can be 10dB or 20dB, and this application does not impose any limitation on this.

[0065] Optionally, the current exhaust noise of the vehicle at idle speed is tested, further comprising:

[0066] If the current exhaust temperature does not meet the preset target exhaust temperature threshold and is higher than the preset target exhaust temperature threshold, the engine needs to be left at rest to warm up until the preset target exhaust temperature threshold is met, and then the current exhaust noise of the vehicle at idle speed is tested;

[0067] If the current exhaust temperature does not meet the preset target exhaust temperature threshold and is lower than the preset target exhaust temperature threshold, it is necessary to continue to accelerate the engine to warm up until the preset target exhaust temperature threshold is met, and then test the current exhaust noise of the vehicle at idle speed.

[0068] Specifically, in this embodiment, the vehicle is fixed on the chassis dynamometer in the anechoic chamber, and the engine is accelerated to heat up under the dynamometer to simulate the road driving condition, so that the gas temperature sensor display value of the front muffler and the rear muffler under the vehicle idling condition reaches the gas temperature N1 and N2 under the actual road condition. If the temperature sensor displays a temperature higher than the preset target exhaust temperature thresholds N1 and N2, it is necessary to idle the engine to heat up until the preset target exhaust temperature thresholds are reached before the exhaust noise test is started. If the temperature sensor displays a temperature lower than the preset target exhaust temperature thresholds N1 and N2, it is necessary to continue to accelerate the engine to heat up on the chassis dynamometer until the preset target exhaust temperature thresholds are reached before the exhaust noise test is started. That is, when the gas temperature of the current muffler and the rear muffler reaches 310°C and 180°C, the noise test is started. And after several groups of tests, the temperature value of the front muffler / rear muffler of the hot idle exhaust should also be identified by the temperature sensor. If the temperature sensor shows that the exhaust temperature is lower than the preset target exhaust temperature threshold, the exhaust noise is significantly reduced (the 26Hz noise peak drops by 5dB(A)), and the exhaust noise also becomes significantly smaller, the exhaust noise is no longer tested, and it is necessary to continue to accelerate the engine to warm up on the chassis dynamometer until the preset target exhaust temperature threshold is reached, and then continue to test the exhaust noise. Or if the temperature sensor shows that the exhaust temperature is higher than the preset target exhaust temperature threshold, the exhaust noise is significantly increased (the 15Hz noise peak increases by 3dB(A)), and the exhaust noise also becomes significantly larger, the exhaust noise is no longer tested, and it is necessary to continue to accelerate the engine to warm up on the chassis dynamometer until the preset target exhaust temperature threshold is reached, and then continue to test the exhaust noise.

[0069] In this embodiment, synchronous testing is performed on the actual vehicle, which can be directly related to the NVH problem of the actual vehicle. It is helpful for problem analysis and problem optimization, and shortens the research and development cycle. The test accuracy is improved, and the "muffler gas temperature" monitoring condition is added to ensure the consistency of each exhaust noise test in the anechoic chamber. The exhaust noise and exhaust temperature are monitored simultaneously in the whole vehicle state. Under the exhaust temperature value N, the exhaust noise level of the scheme is tested to provide the accuracy of the exhaust noise test, while improving the consistency between the exhaust noise simulation and the test, which can save the time and cost of exhaust noise optimization. And the test method of hot car idling exhaust noise including temperature monitoring in the whole vehicle state proposed by the present invention can quickly and accurately identify the exhaust noise problem points of hot car idling conditions, and quickly propose solutions. It can have practical application results in vehicle model NVH development, improve efficiency and reduce costs.

[0070] In summary, the present invention provides a method, device, equipment and medium for testing exhaust noise. By obtaining the current exhaust temperature of the whole vehicle at idle speed, it is determined whether the current exhaust temperature meets the preset target exhaust temperature threshold. If the current exhaust temperature meets the preset target exhaust temperature threshold, the current exhaust noise of the whole vehicle at idle speed is tested, and the exhaust noise result is extracted. The present application uses the temperature value to bring into the exhaust model for simulation optimization, and monitors the exhaust noise and exhaust temperature simultaneously, so that it can be targeted and accurately predicted and optimized, and the whole vehicle idle exhaust noise is tested quickly and effectively, providing the accuracy of the exhaust noise test, while improving the consistency between the exhaust noise simulation and the test, and ensuring the consistency of each exhaust noise test, saving the exhaust noise test time and cost, and taking into account the vehicle's economy and power, thereby greatly reducing the overall noise level of the exhaust tail pipe and improving the user's car experience.

[0071] See also Figure 4 , Figure 4 Schematic diagram of the structure of an exhaust noise testing device provided by an embodiment of the present invention. In this embodiment, the device includes modules for executing Figure 3 For details, please refer to the steps in the corresponding embodiment. Figure 3 as well as Figure 3 For the convenience of explanation, only the parts related to this embodiment are shown. Figure 4 The testing device 40 for determining exhaust noise includes: an acquisition module 41 , a judgment module 42 , and a testing module 43 .

[0072] The acquisition module 41 is used to acquire the current exhaust temperature of the vehicle at idle speed;

[0073] A judgment module 42 is used to judge whether the current exhaust temperature meets a preset target exhaust temperature threshold;

[0074] The test module 43 is used to test the current exhaust noise of the vehicle at idle speed and extract the result of the exhaust noise if the current exhaust temperature meets the preset target exhaust temperature threshold.

[0075] Optionally, the acquisition module 41 is previously specifically used for:

[0076] Obtain the actual measured exhaust temperature value of the vehicle road test;

[0077] Based on the mapping relationship between the pre-calibrated exhaust temperature and exhaust noise, the actual measured exhaust temperature value is input into the simulation analysis model with a pre-set value to calculate the transmission loss value of the exhaust noise of the muffler to be tested;

[0078] Determining whether the transmission loss value meets a preset target transmission loss value;

[0079] Simulation optimization of exhaust noise transmission loss value of vehicle road test is determined based on the judgment results.

[0080] Optionally, the acquisition module 41 is also used before:

[0081] If the transmission loss value meets the preset target transmission loss value, the optimized exhaust noise transmission loss values ​​of the vehicle road test are sorted to determine the weight of the transmission loss value;

[0082] According to the weight of the transmission loss value, the optimal transmission loss value is used as the verification solution to produce samples, and the samples are installed on the actual vehicle to conduct the exhaust noise test at the idle speed of the whole vehicle and obtain the verification test results;

[0083] If the verification test results meet the development requirements, the exhaust noise test of the vehicle at idle speed is completed.

[0084] If the transmission loss value does not meet the preset target transmission loss value, the exhaust noise transmission loss value of the whole vehicle road test will continue to be optimized until the preset target transmission loss value is met.

[0085] Optionally, the acquisition module 41 is also used before:

[0086] The exhaust temperature value includes the temperature value of the front muffler / rear muffler of the idle exhaust of the hot engine obtained by the temperature sensor.

[0087] Optionally, the test module 43 is specifically used for:

[0088] Testing the current exhaust noise of the vehicle at idle speed, wherein the current exhaust noise includes N groups of exhaust noise;

[0089] Determine whether the exhaust noise of N groups remains consistent;

[0090] If the N groups of exhaust noise remain consistent, then determine whether each group of exhaust noise is less than a preset target exhaust noise value;

[0091] If each set of exhaust noise is less than a preset target exhaust noise value, it is determined that the current exhaust noise is qualified, and the result of the current exhaust noise is extracted.

[0092] Optionally, the test module 43 is further used for:

[0093] If the current exhaust temperature does not meet the preset target exhaust temperature threshold and is higher than the preset target exhaust temperature threshold, the engine needs to be left at rest to warm up until the preset target exhaust temperature threshold is met, and then the current exhaust noise of the vehicle at idle speed is tested;

[0094] If the current exhaust temperature does not meet the preset target exhaust temperature threshold and is lower than the preset target exhaust temperature threshold, it is necessary to continue to accelerate the engine to warm up until the preset target exhaust temperature threshold is met, and then test the current exhaust noise of the vehicle at idle speed.

[0095] It should be noted that the information interaction, execution process and other contents between the above modules are based on the same concept as the embodiment of the method of the present invention. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0096] Figure 5 Schematic diagram of the structure of a computer device provided by an embodiment of the present invention. Figure 5 As shown, the computer device of this embodiment includes a processor, a memory, a network interface and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the steps in any of the above-mentioned exhaust noise test method embodiments are implemented.

[0097] The computer device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that Figure 5 This is only an example of a computer device and does not constitute a limitation on the computer device. The computer device may include more or fewer components than shown in the figure, or combine certain components, or different components. For example, it may also include a network interface, a display screen, and an input device. In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following steps are implemented:

[0098] Get the current exhaust temperature of the vehicle at idle speed;

[0099] Determine whether the current exhaust temperature meets the preset target exhaust temperature threshold;

[0100] If the current exhaust temperature meets the preset target exhaust temperature threshold, the current exhaust noise of the vehicle at idle speed is tested and the exhaust noise result is extracted.

[0101] In one embodiment, a computer-readable storage medium is provided. When the instructions in the computer-readable storage medium are executed by a processor in a controller, the controller can execute the steps of any embodiment of a method for testing exhaust noise disclosed in the present invention, which will not be repeated here. The computer-readable storage medium can be non-volatile or volatile.

[0102] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0103] The processor may be a CPU, or other general-purpose processors, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0104] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention. The specific working process of the units and modules in the above-mentioned device can refer to the corresponding process in the above-mentioned method embodiment, which will not be repeated here. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0105] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for testing exhaust noise, characterized in that: include: Get the current exhaust temperature of the vehicle at idle speed; Determining whether the current exhaust temperature meets a preset target exhaust temperature threshold; If the current exhaust temperature meets the preset target exhaust temperature threshold, the current exhaust noise of the vehicle at idle speed is tested and the exhaust noise result is extracted.

2. The exhaust noise testing method according to claim 1, characterized in that: The current exhaust noise of the vehicle at idle speed is tested and the exhaust noise result is extracted, including: Testing the current exhaust noise of the vehicle at idle speed, wherein the current exhaust noise includes N groups of exhaust noise; Determining whether the N groups of exhaust noises are consistent; If the N groups of exhaust noises remain consistent, determining whether each group of exhaust noises is less than a preset target exhaust noise value; If each group of exhaust noise is less than a preset target exhaust noise value, it is determined that the current exhaust noise is qualified, and the result of the current exhaust noise is extracted.

3. The exhaust noise testing method according to claim 2, characterized in that: The present exhaust noise test of the vehicle at idle speed includes: If the current exhaust temperature does not meet the preset target exhaust temperature threshold and is higher than the preset target exhaust temperature threshold, the engine needs to be left at rest to warm up until the preset target exhaust temperature threshold is met, and then the current exhaust noise of the vehicle at idle is tested; If the current exhaust temperature does not meet the preset target exhaust temperature threshold and is lower than the preset target exhaust temperature threshold, it is necessary to continue to accelerate the engine to warm up until the preset target exhaust temperature threshold is met, and then test the current exhaust noise of the vehicle at idle.

4. The exhaust noise testing method according to claim 1, characterized in that: Before obtaining the current exhaust temperature of the vehicle at idle speed, the method includes: Obtain the actual measured exhaust temperature value of the vehicle road test; Based on the mapping relationship between the pre-calibrated exhaust temperature and the exhaust noise, the actual measured exhaust temperature value is input into a simulation analysis model with a preset value to calculate the transmission loss value of the exhaust noise of the muffler to be tested; Determining whether the transmission loss value meets a preset target transmission loss value; Simulation optimization of exhaust noise transmission loss value of vehicle road test is determined based on the judgment results.

5. The exhaust noise testing method according to claim 4, characterized in that: The simulation optimization of the exhaust noise transmission loss value of the vehicle road test based on the judgment result includes: If the transmission loss value satisfies the preset target transmission loss value, the optimized exhaust noise transmission loss values ​​of the vehicle road test are sorted to determine the weights of the transmission loss values; According to the weight of the transmission loss value, the optimal transmission loss value is used as a verification solution to produce a sample, and the sample is installed on a real vehicle to perform an exhaust noise test at idle speed of the whole vehicle and obtain a verification test result; If the verification test results meet the development requirements, the vehicle idle exhaust noise test is completed; If the transmission loss value does not meet the preset target transmission loss value, the exhaust noise transmission loss value of the whole vehicle road test will continue to be optimized until the preset target transmission loss value is met.

6. The exhaust noise testing method according to any one of claims 1 to 5, characterized in that: The exhaust temperature value includes the temperature value of the front muffler / rear muffler of the idle exhaust of the hot engine obtained by the temperature sensor.

7. An exhaust noise testing device, characterized in that: include: The acquisition module is used to obtain the current exhaust temperature of the vehicle at idle speed; A judgment module, used to judge whether the current exhaust temperature meets a preset target exhaust temperature threshold; The test module is used to test the current exhaust noise of the vehicle at idle speed and extract the result of the exhaust noise if the current exhaust temperature meets the preset target exhaust temperature threshold.

8. The exhaust noise testing device according to claim 7, characterized in that: The test module includes: A testing unit, used for testing the current exhaust noise of the whole vehicle at idle speed, wherein the current exhaust noise includes N groups of exhaust noise; Determine N groups of noise units, used to determine whether the N groups of exhaust noises are consistent; Determine each group of noise units, for determining whether each group of exhaust noise is less than a preset target exhaust noise value if the N groups of exhaust noises remain consistent; The extraction unit is used to determine that the current exhaust noise is qualified if each group of exhaust noise is less than a preset target exhaust noise value, and extract the result of the current exhaust noise.

9. A computer device, characterized in that: The computer device includes a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the exhaust noise testing method according to any one of claims 1 to 6 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the exhaust noise testing method according to any one of claims 1 to 6 is implemented.

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