CN112556833A - Method for separating and extracting supercharger noise from engine noise - Google Patents
Method for separating and extracting supercharger noise from engine noise Download PDFInfo
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- CN112556833A CN112556833A CN202011409151.4A CN202011409151A CN112556833A CN 112556833 A CN112556833 A CN 112556833A CN 202011409151 A CN202011409151 A CN 202011409151A CN 112556833 A CN112556833 A CN 112556833A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/12—Testing internal-combustion engines by monitoring vibrations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention discloses a method for separating and extracting supercharger noise from engine noise, and belongs to the technical field of automobile engines. The method comprises the steps of opening a supercharger waste gas bypass valve to discharge waste gas bypass under the condition that the rotating speed of an engine is controlled to be unchanged, recording a noise frequency spectrum in the process that the rotating speed of the supercharger rapidly decreases, if noise disappears in the test process, indicating that the noise is not generated by the supercharger, if the noise still exists, indicating that the noise of the supercharger is one of noise sources, and carrying out filter analysis on the collected noise frequency spectrum to confirm the noise type of the supercharger; the automobile air pressure booster is characterized in that an acceleration sensor and a rotating speed sensor are arranged on a booster pressure shell in the existing automobile using state, a microphone booster waste gas bypass valve is arranged in a cab and connected with an air pump, and an air tap of a bypass pipe at a booster pressure end is in a blocking state. The test method designed by the invention is simple and effective, and solves the problem that the whistle source is identified in the process of releasing the throttle after the engine is accelerated rapidly or slowly in the parking and driving processes, so that the test method has guiding significance for the rectification and modification of internal parts of the engine.
Description
Technical Field
The invention relates to a noise extraction method, belongs to the technical field of automobile engines, and particularly relates to a method for separating and extracting supercharger noise from engine noise.
Background
The turbocharger has obvious advantages in mechanical use, including the functions of effectively improving the power per liter of the engine, improving the emission of the engine, improving altitude compensation and improving fuel economy and reducing oil consumption, but in the use process of the turbocharger, the turbocharger has strong noise, so that the operating environment of the whole equipment is influenced, and the comfort of users is also influenced. Particularly, as the engine is miniaturized and speeded up, noise and high-frequency vibration generated by high-speed rotation of the turbocharger have a great influence on the riding comfort of the automobile. Since the noise of the engine may be a superposition of several noises, how to extract the noise of the supercharger separately therefrom becomes a big problem.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for separating and extracting supercharger noise from engine noise, which is simple to operate and quick and effective in identification process.
In order to achieve the technical purpose, the invention discloses a method for separating and extracting supercharger noise from engine noise, which comprises the steps of opening a supercharger waste gas bypass valve to exhaust waste gas bypass under the condition of controlling the rotating speed of an engine to be unchanged, recording a noise frequency spectrum in the process of rapidly reducing the rotating speed of the supercharger, if noise disappears in the test process, indicating that the noise is not generated by the supercharger, and if the noise still exists, indicating that the supercharger noise is one of noise sources, and carrying out filter analysis on the collected noise frequency spectrum to confirm the type of the supercharger noise;
the automobile air pressure control device is characterized in that an acceleration sensor and a rotating speed sensor are arranged on a pressure shell of the supercharger in the existing automobile using state, a microphone is arranged in a cab, a waste gas bypass valve of the supercharger is connected with an air pump, and an air tap of a bypass pipe at a pressure end of the supercharger is in a blocking state.
Further, the rotating speed of the engine is set to be 2000-3000 rpm and kept stable, and the rotating speed of the engine, the rotating speed of the supercharger, the testing time and the vibration acceleration in the whole testing process are recorded.
Further, the time used in the test process is T, and the following mathematical relation is satisfied:
50s≤T≤70s。
further, in the test process, the initial rotating speed of the engine is idling, then the rotating speed of the engine is pulled up to 2000-3000 rpm and kept stable, the rotating speed of the supercharger is made to rise along with the engine and finally kept stable in the process, after the rotating speed of the engine and the rotating speed of the supercharger are both stable, the waste gas bypass valve of the supercharger is opened, the rotating speed of the engine is kept unchanged, and the rotating speed of the supercharger is rapidly reduced.
Further, in the testing process, the collected vibration frequency spectrum is a vibration waterfall graph with the abscissa as frequency and the ordinate as time.
Further, the collected noise spectrum is a noise waterfall graph with the abscissa as frequency and the ordinate as time.
Further, the supercharger noise type includes at least one of subsynchronous noise, synchronous noise, impulse synchronous noise, vortex-end BPF noise, pressure-end BPF noise, surge noise, or Whoosh noise.
The beneficial effects of the invention are mainly embodied in the following aspects:
1. the noise extraction and separation method designed by the invention has short operation time and higher accuracy.
2. The noise extraction and separation method designed by the invention can effectively solve the problem of identifying the whistle source in the process of releasing the throttle after the engine is accelerated rapidly or slowly in the parking and driving processes, and has guiding significance for the rectification and modification of internal parts of the engine.
Drawings
FIG. 1 is a schematic view of a supercharger designed according to the present invention;
FIG. 2 is a schematic diagram of the change in rotational speed of the engine and supercharger;
FIG. 3 is a noise waterfall plot;
fig. 4 is a schematic diagram of fig. 3 after noise filtering.
Wherein, the numbering of each part in the above-mentioned figure is as follows:
the device comprises a supercharger pressure end 1, an exhaust gas bypass end 2, a diaphragm compression spring 3, a valve 4, an air pump 5 and an actuator bypass pipe 6; a bypass air tap 7.
Detailed Description
The invention designs a method for separating and extracting supercharger noise from engine noise, which aims to solve the problems that whistle is commonly generated when an accelerator is released after rapid acceleration or slow acceleration in the parking and driving processes of the conventional diesel engine, the whistle source can be an engine main moving part, a supercharger body or both of the engine main moving part and the supercharger body, and the noise of the engine main moving part and the supercharger body can exist simultaneously and synchronously, so that the noise is difficult to distinguish by adopting a conventional method, and a separation method needs to be designed.
For the vehicle engine, in order to solve the performance problem of low working condition, the high working condition air discharge system is adopted more. In this case, the design of the turbocharger is such that the engine can obtain maximum torque below a medium rotational speed, i.e. the turbocharger is matched with the diesel engine according to maximum torque operating parameters. When the engine is in high speed, in order to limit the supercharging pressure, the highest explosion pressure and the supercharger speed within the allowable range, part of exhaust gas or part of supercharging air of the engine is exhausted through a deflation valve, and a section of operation line of the engine in high load is close to the level. Thus, to isolate supercharger noise, the present invention utilizes the principle of supercharger bleed bypass.
Specifically, an acceleration sensor and a rotation speed sensor are arranged on a pressure shell of the supercharger in the existing vehicle using state, a microphone is arranged in a cab, the acceleration sensor is used for collecting vibration signals of the supercharger, the rotation speed sensor is used for collecting rotation speed signals of the supercharger, and the microphone is used for collecting noise signals.
As can also be seen from the attached figure 1 of the specification, the supercharger waste gas bypass valve is connected with the air pump 5, so that a supercharger waste gas bypass actuator bypass pipe 6 is connected with the air pump 5, and a bypass pipe air tap 7 of the supercharger pressure end 1 is in a blocking state. Under the condition that the engine keeps a certain stable rotating speed, air is pumped to the actuator bypass pipe 6 through the air pump 5, compressed air passes through the diaphragm compression spring 3 to pull the valve 4, waste gas in the exhaust pipeline is discharged through the waste gas bypass end 2, the rotating speed of the supercharger falls back quickly at the same time, the noise frequency spectrum of the process is synchronously recorded, and the purpose of independently extracting the noise of the supercharger is achieved. If the whistle disappears during the test, it is interpreted that the whistle is not being produced by the booster. If the whistle still exists in the test process, the noise of the supercharger is one of the sources of the whistle, noise spectrum filtering analysis can be carried out according to the noise characteristic of the supercharger, and finally the characteristic noise of the supercharger is confirmed and can be pertinently rectified and improved.
The engine rotating speed is set to be 2000-3000 rpm and kept stable, and the engine rotating speed, the supercharger rotating speed, the testing time and the vibration acceleration in the whole testing process are recorded.
The time used in the test process is T, and the following mathematical relation is satisfied:
50s≤T≤70s。
in the testing process, the initial rotating speed of the engine is idling, then the rotating speed of the engine is pulled up to 2000-3000 rpm and kept stable, the rotating speed of the supercharger is made to rise along with the engine and finally kept stable in the process, after the rotating speed of the engine and the rotating speed of the supercharger are both stable, the waste gas bypass valve of the supercharger is opened, the rotating speed of the engine is kept unchanged, and the rotating speed of the supercharger is rapidly reduced.
In the testing process, the collected vibration frequency spectrum is a vibration waterfall graph with the abscissa as frequency and the ordinate as time.
The collected noise frequency spectrum is a noise waterfall graph with the abscissa as frequency and the ordinate as time.
The supercharger noise type includes at least one of subsynchronous noise, synchronous noise, impulse synchronous noise, vortex-end BPF noise, pressure-end BPF noise, surge noise, or Whoosh noise. Specifically shown in the following table 1;
TABLE 1 supercharger noise type List
In order to better explain the above testing process, the main content of the present invention is further illustrated below with reference to specific examples, but the content of the present invention is not limited to only the following examples.
Example 1
Starting the vehicle in a neutral gear static state, pulling the rotating speed of the engine to 2000rpm and keeping the rotating speed stable, opening a waste gas bypass valve of a supercharger to bypass waste gas, and simultaneously quickly dropping the rotating speed of the supercharger; recording the rotating speed of the engine, the rotating speed of the supercharger and the test time in the whole process; the specific recording results are shown in fig. 2; continuously adjusting the vehicle to the running state of 1 gear, 2 gear, 3 gear, 4 gear or 5 gear, respectively increasing the rotating speed of the engine to 2000rpm and keeping the rotating speed stable, repeating the operations, and recording the rotating speed of the engine, the rotating speed of the supercharger, the test time and the like in a series of processes; the specific recording results are shown in fig. 2;
referring to fig. 2, the initial engine speed is 750rpm, then the engine speed is pulled up to 2000rpm and kept stable, the supercharger speed is made to rise to 85000rpm and finally kept stable in the process, after the engine speed and the supercharger speed are both stabilized, the supercharger waste gas bypass valve is opened, the engine speed is kept unchanged at 2000rpm in the process, and the supercharger speed is rapidly reduced from 85000rpm to 40000 rpm.
Recording the noise spectrum in the test process, as shown in fig. 3, and filtering the noise spectrum to obtain fig. 4;
as can be seen from fig. 3 and 4, after the noise filtering is performed on the bright band in the arc region of the middle portion, the filtered noise is played back to show that the whistle sound disappears, and the supercharger noise can be determined to be the supercharger synchronization noise when the noise frequency and the supercharger rotation speed form a 1-order relationship.
According to the embodiment, the rotating speed of the engine is set to be 2000-3000 rpm, waste gas is bypassed in the static state and the moving state of the vehicle respectively, the rotating speed of the supercharger is reduced rapidly, the noise frequency spectrum is collected and filtered, the noise type of the supercharger can be determined simply and rapidly, and the noise type can be judged rapidly in the driving process and the guiding significance on the rectification and modification of internal parts of the engine is achieved.
The above examples are merely preferred examples and are not intended to limit the embodiments of the present invention. In addition to the above embodiments, the present invention has other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (7)
1. A method for separating and extracting supercharger noise from engine noise is characterized by comprising the steps of opening a supercharger waste gas bypass valve to discharge waste gas bypass under the condition that the rotating speed of an engine is controlled to be unchanged, recording a noise frequency spectrum in the process that the rotating speed of the supercharger rapidly decreases, if noise disappears in the test process, indicating that the noise is not generated by the supercharger, if the noise still exists, indicating that the supercharger noise is one of noise sources, and carrying out filter analysis on the collected noise frequency spectrum to confirm the type of the supercharger noise;
the automobile air pressure control device is characterized in that an acceleration sensor and a rotating speed sensor are arranged on a pressure shell of the supercharger in the existing automobile using state, a microphone is arranged in a cab, a waste gas bypass valve of the supercharger is connected with an air pump, and an air tap of a bypass pipe at a pressure end of the supercharger is in a blocking state.
2. The method for separating and extracting supercharger noise from engine noise according to claim 1, wherein the engine speed is set to 2000-3000 rpm and kept stable, and the engine speed, the supercharger speed, the test time and the vibration acceleration in the whole test process are recorded.
3. The method for separating and extracting supercharger noise from engine noise according to claim 2, wherein the test procedure uses time T and satisfies the following mathematical relation:
50s≤T≤70s。
4. the method for separating and extracting supercharger noise from engine noise according to claim 2, characterized in that in the test process, the initial rotating speed of the engine is idling, then the rotating speed of the engine is pulled up to 2000-3000 rpm and kept stable, the rotating speed of the supercharger is made to follow up and finally kept stable in the process, after the rotating speed of the engine and the rotating speed of the supercharger are both stable, a waste gas bypass valve of the supercharger is opened, the rotating speed of the engine is kept unchanged, and the rotating speed of the supercharger is rapidly reduced.
5. The method of claim 4, wherein the collected vibration spectrum is a vibration waterfall graph with frequency on the abscissa and time on the ordinate during the test.
6. The method for separating and extracting supercharger noise from engine noise according to any one of claims 1-5, wherein the collected noise spectrum is a noise waterfall graph with the abscissa as frequency and the ordinate as time.
7. The method for separating and extracting supercharger noise from engine noise according to any one of claims 1-5, wherein the supercharger noise type comprises at least one of subsynchronous noise, synchronous noise, pulse synchronous noise, vortex-end BPF noise, pressure-end BPF noise, surge noise or Whoosh noise.
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| CN202011409151.4A CN112556833B (en) | 2020-12-04 | 2020-12-04 | Method for separating and extracting supercharger noise from engine noise |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113624335A (en) * | 2021-10-09 | 2021-11-09 | 江铃汽车股份有限公司 | Method for testing and evaluating exhaust airflow sound in vehicle rapid acceleration process |
| CN114893260A (en) * | 2022-04-13 | 2022-08-12 | 东风汽车股份有限公司 | Structure for simply eliminating noise of supercharger and test method thereof |
| CN115263550A (en) * | 2022-07-29 | 2022-11-01 | 东风汽车集团股份有限公司 | Vehicle and fuel desorption system noise identification method and system and computer equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103061870A (en) * | 2011-10-20 | 2013-04-24 | 福特环球技术公司 | Method and system for reducing turbocharger noise during cold start |
| US20150354446A1 (en) * | 2013-01-23 | 2015-12-10 | Borgwarner Inc. | Acoustic measuring device |
| CN111366347A (en) * | 2019-10-22 | 2020-07-03 | 襄阳达安汽车检测中心有限公司 | Method for diagnosing abnormal sound of turbocharger |
-
2020
- 2020-12-04 CN CN202011409151.4A patent/CN112556833B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103061870A (en) * | 2011-10-20 | 2013-04-24 | 福特环球技术公司 | Method and system for reducing turbocharger noise during cold start |
| US20150354446A1 (en) * | 2013-01-23 | 2015-12-10 | Borgwarner Inc. | Acoustic measuring device |
| CN111366347A (en) * | 2019-10-22 | 2020-07-03 | 襄阳达安汽车检测中心有限公司 | Method for diagnosing abnormal sound of turbocharger |
Non-Patent Citations (2)
| Title |
|---|
| 周景航 等: "某1.4T 汽油发动机涡轮增压器 BPF 噪声问题试验研究", 《内燃机与配件》 * |
| 徐峰 等: "基于音噪比(TTN)的增压器噪声试验研究", 《汽车实用技术》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113624335A (en) * | 2021-10-09 | 2021-11-09 | 江铃汽车股份有限公司 | Method for testing and evaluating exhaust airflow sound in vehicle rapid acceleration process |
| CN113624335B (en) * | 2021-10-09 | 2022-01-25 | 江铃汽车股份有限公司 | Method for testing and evaluating exhaust airflow sound in vehicle rapid acceleration process |
| CN114893260A (en) * | 2022-04-13 | 2022-08-12 | 东风汽车股份有限公司 | Structure for simply eliminating noise of supercharger and test method thereof |
| CN114893260B (en) * | 2022-04-13 | 2024-03-15 | 东风汽车股份有限公司 | Simple structure for eliminating noise of supercharger and testing method thereof |
| CN115263550A (en) * | 2022-07-29 | 2022-11-01 | 东风汽车集团股份有限公司 | Vehicle and fuel desorption system noise identification method and system and computer equipment |
| CN115263550B (en) * | 2022-07-29 | 2023-11-14 | 东风汽车集团股份有限公司 | Method, system and computer equipment for identifying noise of vehicle and fuel desorption system |
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