CN115405418B - Method, device and equipment for analyzing engine airflow noise and readable storage medium - Google Patents
Method, device and equipment for analyzing engine airflow noise and readable storage medium Download PDFInfo
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- CN115405418B CN115405418B CN202210927245.3A CN202210927245A CN115405418B CN 115405418 B CN115405418 B CN 115405418B CN 202210927245 A CN202210927245 A CN 202210927245A CN 115405418 B CN115405418 B CN 115405418B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
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- F02B77/08—Safety, indicating or supervising devices
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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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention provides a method, a device and equipment for analyzing engine airflow noise and a readable storage medium, wherein the method for analyzing the engine airflow noise comprises the following steps: acquiring vibration signals acquired by a plurality of vibration sensors arranged on an engine and noise signals acquired by a plurality of microphones; determining whether the abnormal sound is related to the air intake and exhaust system based on the vibration signal and the noise signal; if the abnormal sound is determined to be related to the air intake and exhaust system, converting time domain data of the noise signal into a crank angle according to a phase relation between a cam shaft signal, a cylinder ignition signal or a cylinder pressure signal and a crank shaft; determining a target crank angle corresponding to the abnormal response; a target cylinder that generates abnormal sound is determined based on the target crank angle. By applying the method to the early stage of model development, the abnormal noise of the air inlet pulsation of the engine can be rapidly identified and improved in the early stage of product development, so that more development cost is reduced, and the efficiency of model and vehicle type development is improved.
Description
Technical Field
The invention relates to the field of abnormal sound investigation of engines, in particular to an analysis method, an analysis device, analysis equipment and a readable storage medium of airflow noise of an engine.
Background
The abnormal sound investigation of the engine relates to NVH test technology and engine principle and structure. NVH performance level of the whole vehicle can be evaluated through NVH test, whether the NVH performance level meets the national mandatory regulation requirement or not is determined, whether the NVH performance level is competitive with a racing vehicle type or not, and whether the NVH performance level meets user requirements or not is determined. Experience in accumulated data formation through NVH tests can effectively guide NVH performance development, such as: setting NVH performance design indexes and target values of the whole vehicle and subsystems; the source of vibration noise problem can be found out through NVH test, and the effectiveness of the scheme is evaluated, so that the purpose of optimizing NVH performance of the whole vehicle is achieved.
However, in the prior art, a specific scheme for resolving noise abnormal sound generated by airflow of the whole vehicle or the engine and obtaining a corresponding improvement scheme based on the resolving result so as to eliminate airflow noise is not available.
Disclosure of Invention
The invention mainly aims to provide an analysis method, an analysis device, analysis equipment and a readable storage medium for engine airflow noise, and aims to solve the technical problem that an analysis scheme for noise abnormal sound generated by airflow of a whole vehicle or an engine does not exist in the prior art.
In a first aspect, the present invention provides a method for analyzing engine airflow noise, where the method for analyzing engine airflow noise includes the following steps:
acquiring vibration signals acquired by a plurality of vibration sensors arranged on an engine and noise signals acquired by a plurality of microphones;
determining whether the abnormal sound is related to the air intake and exhaust system based on the vibration signal and the noise signal;
if the abnormal sound is determined to be related to the air intake and exhaust system, converting time domain data of the noise signal into a crank angle according to a phase relation between a cam shaft signal, a cylinder ignition signal or a cylinder pressure signal and a crank shaft;
determining a target crank angle corresponding to the abnormal response;
a target cylinder that generates abnormal sound is determined based on the target crank angle.
Optionally, the step of determining whether the abnormal sound is related to the air intake and exhaust system based on the vibration signal and the noise signal includes:
determining a target frequency segment corresponding to the abnormal sound, and taking the occurrence frequency of the abnormal sound of the target frequency segment in one working cycle of the engine as a target rhythm characteristic;
performing wavelet analysis processing on the vibration signal and the noise signal to obtain a first analysis chart and a second analysis chart;
if the vibration signal amplitude of the air inlet manifold and the noise signal amplitude of the air inlet are stronger than the signal amplitudes of other frequency bands in the target frequency band in the first analysis chart and the second analysis chart, and the appearance frequency at the position with the larger amplitude is consistent with the target rhythm characteristic, determining that abnormal sound is related to the air inlet system;
If the amplitude of the vibration signal of the exhaust manifold and the amplitude of the noise signal of the exhaust port are stronger than those of signals of other frequency bands in the target frequency band in the first analysis chart and the second analysis chart, and the appearance frequency at the position with the larger amplitude is consistent with the target rhythm characteristic, determining that abnormal sound is related to the exhaust system;
and if the vibration signal amplitude of the air inlet manifold and the air outlet manifold and the noise signal amplitude of the air inlet and the air outlet in the first analysis chart and the second analysis chart are not stronger than the signal amplitudes of other frequency bands in the target frequency band, and the signal amplitudes of the engine cylinder body and the suspension driving side are stronger than the signal amplitudes of other frequency bands in the target frequency band, determining that abnormal sound is irrelevant to the air inlet and the air outlet system.
Optionally, after the step of determining the target cylinder generating the abnormal noise based on the target crank angle, the method further includes:
acquiring pressure signals acquired by pressure sensors arranged at an intake manifold or an exhaust manifold of each cylinder;
performing fast Fourier transform processing on pressure signals corresponding to each cylinder, and converting the pressure signals from time domain signals into frequency spectrum signals;
comparing the pressure value of each cylinder pressure signal of the target frequency band;
If the pressure value of the target cylinder is larger than the pressure value of the residual cylinder, the abnormal sound caused by different air inlet pulsation or exhaust pulsation of the target cylinder and the residual cylinder is determined.
Optionally, the step of converting the time domain data of the noise signal into the crank angle according to the phase relation of the cam shaft signal, the cylinder ignition signal or the cylinder pressure signal and the crank comprises:
according to the phase relation between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal and the crankshaft, a first crankshaft tooth-missing period closest to the starting time of any period of the camshaft signal, the cylinder ignition time or the cylinder pressure peak value time is found, and the ending time of the first crankshaft tooth-missing period is a first time, wherein the first time corresponds to a first crank angle;
determining a first crankshaft spacing angle between a start time and a first time of an engine one cycle based on the engine model;
determining a second crank angle corresponding to a start time of one working cycle of the engine based on the first crank angle and the first crank interval angle;
based on the second crank angle, time domain data of the noise signal is converted into crank angles corresponding to each working cycle of the engine.
Optionally, the step of determining the target cylinder generating the abnormal noise based on the target crank angle includes:
obtaining a mapping relation between the piston stroke and the crank angle of each cylinder of the engine, wherein the piston stroke of each cylinder comprises a working process, an exhaust process, an air inlet process and a compression process;
if the abnormal sound is related to the air inlet system, determining that the crank angle is a target crank angle, and taking the cylinder as a target cylinder for generating the abnormal sound, wherein the piston stroke is in the air inlet process;
if the abnormal sound is related to the exhaust system, determining that the crank angle is the target crank angle, and taking the cylinder as a target cylinder for generating the abnormal sound, wherein the piston stroke is in a cylinder in the exhaust process.
Optionally, the vibration sensor is specifically arranged at the front end and the rear end of the engine cylinder body, each suspension driving side, the intake manifold and the exhaust manifold; the microphone is specifically arranged at the top end of the engine, the front end of the engine, the air inlet and the air outlet.
In a second aspect, the present invention also provides an engine airflow noise analysis device, where the engine airflow noise analysis device includes:
the acquisition module is used for acquiring vibration signals acquired by a plurality of vibration sensors arranged on the engine and noise signals acquired by a plurality of microphones;
The first determining module is used for determining whether abnormal sound is related to the air inlet and outlet system or not based on the vibration signal and the noise signal;
the conversion module is used for converting time domain data of the noise signal into a crank angle according to the phase relation between a cam shaft signal, a cylinder ignition signal or a cylinder pressure signal and a crank shaft if the abnormal sound is determined to be related to the air intake and exhaust system;
the second determining module is used for determining a target crank angle corresponding to the abnormal response;
and a third determination module for determining a target cylinder generating abnormal sound based on the target crank angle.
Optionally, the first determining module is specifically configured to:
determining a target frequency segment corresponding to the abnormal sound, and taking the occurrence frequency of the abnormal sound of the target frequency segment in one working cycle of the engine as a target rhythm characteristic;
performing wavelet analysis processing on the vibration signal and the noise signal to obtain a first analysis chart and a second analysis chart;
if the vibration signal amplitude of the air inlet manifold and the noise signal amplitude of the air inlet are stronger than the signal amplitudes of other frequency bands in the target frequency band in the first analysis chart and the second analysis chart, and the appearance frequency at the position with the larger amplitude is consistent with the target rhythm characteristic, determining that abnormal sound is related to the air inlet system;
If the amplitude of the vibration signal of the exhaust manifold and the amplitude of the noise signal of the exhaust port are stronger than those of signals of other frequency bands in the target frequency band in the first analysis chart and the second analysis chart, and the appearance frequency at the position with the larger amplitude is consistent with the target rhythm characteristic, determining that abnormal sound is related to the exhaust system;
and if the vibration signal amplitude of the air inlet manifold and the air outlet manifold and the noise signal amplitude of the air inlet and the air outlet in the first analysis chart and the second analysis chart are not stronger than the signal amplitudes of other frequency bands in the target frequency band, and the signal amplitudes of the engine cylinder body and the suspension driving side are stronger than the signal amplitudes of other frequency bands in the target frequency band, determining that abnormal sound is irrelevant to the air inlet and the air outlet system.
Optionally, the device for analyzing the engine airflow noise further includes a verification module, specifically configured to:
acquiring pressure signals acquired by pressure sensors arranged at an intake manifold or an exhaust manifold of each cylinder;
performing fast Fourier transform processing on pressure signals corresponding to each cylinder, and converting the pressure signals from time domain signals into frequency spectrum signals;
comparing the pressure value of each cylinder pressure signal of the target frequency band;
if the pressure value of the target cylinder is larger than the pressure value of the residual cylinder, the abnormal sound caused by different air inlet pulsation or exhaust pulsation of the target cylinder and the residual cylinder is determined.
Optionally, the conversion module is specifically configured to:
according to the phase relation between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal and the crankshaft, a first crankshaft tooth-missing period closest to the starting time of any period of the camshaft signal, the cylinder ignition time or the cylinder pressure peak value time is found, and the ending time of the first crankshaft tooth-missing period is a first time, wherein the first time corresponds to a first crank angle;
determining a first crankshaft spacing angle between a start time and a first time of an engine one cycle based on the engine model;
determining a second crank angle corresponding to a start time of one working cycle of the engine based on the first crank angle and the first crank interval angle;
based on the second crank angle, time domain data of the noise signal is converted into crank angles corresponding to each working cycle of the engine.
Optionally, the third determining module is specifically configured to:
obtaining a mapping relation between the piston stroke and the crank angle of each cylinder of the engine, wherein the piston stroke of each cylinder comprises a working process, an exhaust process, an air inlet process and a compression process;
if the abnormal sound is related to the air inlet system, determining that the crank angle is a target crank angle, and taking the cylinder as a target cylinder for generating the abnormal sound, wherein the piston stroke is in the air inlet process;
If the abnormal sound is related to the exhaust system, determining that the crank angle is the target crank angle, and taking the cylinder as a target cylinder for generating the abnormal sound, wherein the piston stroke is in a cylinder in the exhaust process.
Optionally, the vibration sensor is specifically arranged at the front end and the rear end of the engine cylinder body, each suspension driving side, the intake manifold and the exhaust manifold; the microphone is specifically arranged at the top end of the engine, the front end of the engine, the air inlet and the air outlet.
In a third aspect, the present invention also provides an engine airflow noise analysis device, where the engine airflow noise analysis device includes a processor, a memory, and an engine airflow noise analysis program stored on the memory and executable by the processor, where the engine airflow noise analysis program, when executed by the processor, implements the steps of the engine airflow noise analysis method as described above.
In a fourth aspect, the present invention further provides a readable storage medium, where a program for analyzing engine airflow noise is stored, where the program for analyzing engine airflow noise, when executed by a processor, implements the steps of the method for analyzing engine airflow noise as described above.
The invention provides a method, a device and equipment for analyzing engine airflow noise and a readable storage medium, wherein the method for analyzing the engine airflow noise comprises the following steps: acquiring vibration signals acquired by a plurality of vibration sensors arranged on an engine and noise signals acquired by a plurality of microphones; determining whether the abnormal sound is related to the air intake and exhaust system based on the vibration signal and the noise signal; if the abnormal sound is determined to be related to the air intake and exhaust system, converting time domain data of the noise signal into a crank angle according to a phase relation between a cam shaft signal, a cylinder ignition signal or a cylinder pressure signal and a crank shaft; determining a target crank angle corresponding to the abnormal response; a target cylinder that generates abnormal sound is determined based on the target crank angle. By applying the method to the early stage of model development, the abnormal noise of the air inlet pulsation of the engine can be rapidly identified and improved in the early stage of product development, so that more development cost is reduced, and the efficiency of model and vehicle type development is improved.
Drawings
FIG. 1 is a schematic hardware configuration of an engine airflow noise analysis device according to an embodiment of the present invention;
FIG. 2 is a flow chart of an embodiment of a method for analyzing engine airflow noise according to the present invention;
FIG. 3 is a flow chart of a method for analyzing engine airflow noise according to another embodiment of the present invention;
FIG. 4 is a flow chart of a method for analyzing engine airflow noise according to another embodiment of the present invention;
fig. 5 is a functional block diagram of an embodiment of an engine airflow noise analysis device according to the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In a first aspect, an embodiment of the present invention provides an apparatus for analyzing engine airflow noise.
Referring to fig. 1, fig. 1 is a schematic hardware configuration of an engine airflow noise analysis device according to an embodiment of the present invention. In an embodiment of the present invention, the engine airflow noise analyzing device may include a processor 1001 (e.g., a central processing unit Central Processing Unit, a CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein the communication bus 1002 is used to enable connected communications between these components; the user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard); the network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., WIreless-FIdelity, WI-FI interface); the memory 1005 may be a high-speed random access memory (random access memory, RAM) or a stable memory (non-volatile memory), such as a disk memory, and the memory 1005 may alternatively be a storage device independent of the processor 1001. Those skilled in the art will appreciate that the hardware configuration shown in fig. 1 is not limiting of the invention and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.
With continued reference to FIG. 1, a computer storage medium memory 1005 of FIG. 1 may include an operating system, a network communication module, a user interface module, and a program for resolving engine airflow noise. The processor 1001 may call a resolving program of the engine airflow noise stored in the memory 1005, and execute the resolving method of the engine airflow noise provided in the embodiment of the present invention.
In a second aspect, an embodiment of the present invention provides a method for analyzing airflow noise of an engine.
Referring to fig. 2, fig. 2 is a flow chart illustrating an embodiment of a method for analyzing engine airflow noise according to the present invention.
In an embodiment of the method for analyzing engine airflow noise of the present invention, the method for analyzing engine airflow noise includes:
step S10, vibration signals acquired by a plurality of vibration sensors arranged on an engine and noise signals acquired by a plurality of microphones are acquired;
in this embodiment, a plurality of vibration sensors are arranged at different positions on the engine to collect vibration signals, and a plurality of microphones are arranged to collect noise signals. When obvious rhythmic knocking sounds appear on the engine, the reason for the obvious rhythmic knocking sounds appear on the engine needs to be determined, so that vibration signals acquired by a plurality of vibration sensors arranged on the engine and noise signals acquired by a plurality of microphones are acquired.
Further, in an embodiment, the vibration sensor is specifically disposed at front and rear ends of the engine cylinder, each suspension active side, the intake manifold and the exhaust manifold; the microphone is specifically arranged at the top end of the engine, the front end of the engine, the air inlet and the air outlet.
In this embodiment, considering that it is necessary to confirm whether the whole vehicle or the engine generates noise due to airflow, the airflow noise is generally caused by exhaust pulsation in different cylinders in the intake and exhaust system of the engine. Therefore, when the positions of the vibration sensor and the microphone are correspondingly arranged, the vibration sensor and the microphone are required to be arranged at the position where the vibration signal and the noise signal of the air intake and exhaust system can be accurately monitored, so that the accuracy of noise monitoring is improved. Specifically, the vibration sensors are specifically arranged at the front end and the rear end of an engine cylinder body, at each suspension driving side, at an intake manifold and at an exhaust manifold; the microphone is specifically arranged on the main side face of the engine: engine top 1m, engine front 1m, air inlet near field and exhaust near field.
Step S20, determining whether abnormal sound is related to an air intake and exhaust system or not based on the vibration signal and the noise signal;
In this embodiment, the collected vibration signals and noise signals at different positions of the engine are processed and analyzed, and whether abnormal noise is related to the air intake and exhaust system or not can be determined through comparison of signal amplitude values and feature comparison of the vibration signals and the noise signals at different positions of the engine.
Further, in an embodiment, the step S20 includes:
determining a target frequency segment corresponding to the abnormal sound, and taking the occurrence frequency of the abnormal sound of the target frequency segment in one working cycle of the engine as a target rhythm characteristic;
performing wavelet analysis processing on the vibration signal and the noise signal to obtain a first analysis chart and a second analysis chart;
if the vibration signal amplitude of the air inlet manifold and the noise signal amplitude of the air inlet are stronger than the signal amplitudes of other frequency bands in the target frequency band in the first analysis chart and the second analysis chart, and the appearance frequency at the position with the larger amplitude is consistent with the target rhythm characteristic, determining that abnormal sound is related to the air inlet system;
if the amplitude of the vibration signal of the exhaust manifold and the amplitude of the noise signal of the exhaust port are stronger than those of signals of other frequency bands in the target frequency band in the first analysis chart and the second analysis chart, and the appearance frequency at the position with the larger amplitude is consistent with the target rhythm characteristic, determining that abnormal sound is related to the exhaust system;
And if the vibration signal amplitude of the air inlet manifold and the air outlet manifold and the noise signal amplitude of the air inlet and the air outlet in the first analysis chart and the second analysis chart are not stronger than the signal amplitudes of other frequency bands in the target frequency band, and the signal amplitudes of the engine cylinder body and the suspension driving side are stronger than the signal amplitudes of other frequency bands in the target frequency band, determining that abnormal sound is irrelevant to the air inlet and the air outlet system.
In this embodiment, specifically, the step of determining whether the abnormal sound is related to the intake and exhaust system based on the vibration signal and the noise signal includes: firstly, based on subjective judgment of the rough direction of abnormal sound, the abnormal sound noise signal is processed, and it is determined that the abnormal sound is generated in a target frequency band of the engine, if the abnormal sound is corresponding to a knocking characteristic with obvious regularity in a frequency band of 300-500HZ, the 300-500HZ is used as the target frequency band corresponding to the abnormal sound, and the occurrence frequency of the abnormal sound in one working cycle of the engine in the target frequency band is used as the target rhythm characteristic. On the basis, the subjective result of whether the input noise signal (subjected to the filtering processing of the target frequency band) is consistent with the apparent rhythm striking sound actually appearing by the engine is combined, and the target frequency band and the target rhythm characteristic corresponding to the abnormal response are confirmed.
After confirming that the target frequency band and the target rhythm characteristic corresponding to the abnormal sound are obtained, carrying out wavelet analysis processing on the obtained plurality of vibration signals to obtain a first analysis chart, and carrying out wavelet analysis processing on the obtained plurality of noise signals to obtain a second analysis chart. And comparing and judging the target frequency range and the target rhythm characteristic of the first analysis chart and the second analysis chart, and determining whether the signal amplitude of each vibration signal and each noise signal in the target frequency range (such as 300-500 HZ) is stronger than the signal amplitude of other frequency ranges on the analysis chart, and whether the occurrence frequency at the position with the larger amplitude is consistent with the target rhythm characteristic, thereby determining whether abnormal sound is related to an air intake and exhaust system.
And if the vibration signal amplitude of the air inlet manifold and the noise signal amplitude of the air inlet are stronger than the signal amplitudes of other frequency bands in the target frequency band in the first analysis chart and the second analysis chart, and the appearance frequency at the position with the larger amplitude is consistent with the target rhythm characteristic, determining that abnormal sound is related to the air inlet system.
If the amplitude of the vibration signal of the exhaust manifold and the amplitude of the noise signal of the exhaust port are stronger than those of signals of other frequency bands in the target frequency band in the first analysis chart and the second analysis chart, and the appearance frequency at the position with the larger amplitude is consistent with the target rhythm characteristic, abnormal sound is determined to be related to the exhaust system.
And if the vibration signal amplitude of the air inlet manifold and the air outlet manifold and the noise signal amplitude of the air inlet and the air outlet in the first analysis chart and the second analysis chart are not stronger than the signal amplitudes of other frequency bands in the target frequency band, and the signal amplitudes of the engine cylinder body and the suspension driving side are stronger than the signal amplitudes of other frequency bands in the target frequency band, determining that abnormal sound is irrelevant to the air inlet and the air outlet system.
Step S30, if the abnormal sound is determined to be related to the air intake and exhaust system, converting time domain data of a noise signal into a crank angle according to a phase relation between a cam shaft signal, a cylinder ignition signal or a cylinder pressure signal and a crank shaft;
in this embodiment, if it is determined that abnormal sound is related to the intake and exhaust system, it is further determined which cylinder in the intake and exhaust system of the engine has abnormal sound during the intake process or the exhaust process. The collected noise signals are time domain data, so that the time of abnormal sound generation corresponding to the target frequency band can be determined based on the time domain data of the first analysis chart and the second analysis chart, but the time of abnormal sound generation cannot be determined at this time, and the time corresponds to a cylinder in an air intake process or an air exhaust process. In consideration of the corresponding mapping relation between the piston stroke (including the air intake process and the air exhaust process) and the crank angle of each cylinder of the engine, the time domain data of the noise signal can be converted into the crank angle, and the corresponding relation between the abnormal sound generation time of the target frequency band and the crank angle is determined, so that the corresponding target crank angle when the abnormal sound of the target frequency band is generated is further determined later. Wherein, the time domain data of the noise signal can be converted into crank angle according to the phase relation of the cam shaft signal, the cylinder ignition signal or the cylinder pressure signal and the crank shaft.
Further, in an embodiment, the step of converting the time domain data of the noise signal into the crank angle according to the phase relation of the cam shaft signal, the cylinder ignition signal or the cylinder pressure signal and the crank shaft comprises:
according to the phase relation between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal and the crankshaft, a first crankshaft tooth-missing period closest to the starting time of any period of the camshaft signal, the cylinder ignition time or the cylinder pressure peak value time is found, and the ending time of the first crankshaft tooth-missing period is a first time, wherein the first time corresponds to a first crank angle;
determining a first crankshaft spacing angle between a start time and a first time of an engine one cycle based on the engine model;
determining a second crank angle corresponding to a start time of one working cycle of the engine based on the first crank angle and the first crank interval angle;
based on the second crank angle, time domain data of the noise signal is converted into crank angles corresponding to each working cycle of the engine.
In this embodiment, specifically, the step of converting the time domain data of the noise signal into the crank angle according to the phase relation between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal and the crank comprises: according to the phase relation between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal and the crankshaft, a first crankshaft tooth-missing period closest to the starting time of any period of the camshaft signal, the cylinder ignition time or the cylinder pressure peak value time is found, and the ending time of the first crankshaft tooth-missing period is a first time, wherein the first time corresponds to a first crank angle.
Wherein, for the same engine model, the top dead center time of one cylinder (namely, the starting time of one working cycle of the corresponding engine) and the first crankshaft interval angle of the first time are the same. And after the start time of one working cycle of the engine is determined, the crank angle corresponding to the start time of one working cycle of the engine can be determined on the basis, so that the time domain data of the noise signal is converted into the crank angle corresponding to each working cycle of the engine. Thus, after determining the first crank angle corresponding to the first moment, a first crank angle interval between a start moment and the first moment of one working cycle of the engine can be determined based on the engine model. And determining a second crank angle corresponding to the start time of one working cycle of the engine based on the first crank angle and the first crank interval angle. And converting time domain data of the noise signal into crank angles corresponding to each working cycle of the engine based on the second crank angles.
For example, if T1 through T3 on the analysis chart are determined to be the crankshaft two missing tooth signals, the interval is 720 for one engine operating cycle. According to the phase relation of the crankshaft and the camshaft, a crankshaft tooth missing signal corresponding to a camshaft signal tooth corresponding to the moment T1 is separated from the top dead center angle of the 1 cylinder by 78 degrees, and the moment T2 of the top dead center can be obtained by T1+78 degrees. And converting time domain data corresponding to each moment on the analysis chart into crank angles of the engine in each working cycle by taking T2 as a starting point 0 DEG and T3+78 DEG as 720 deg.
Step S40, determining a target crank angle corresponding to the abnormal response;
in this embodiment, after the time domain data of the noise signal is converted into the crank angle according to the phase relation between the cam shaft signal, the cylinder ignition signal or the cylinder pressure signal and the crank shaft, it may be determined that the abnormal sound generating time of the target frequency band obtains the corresponding target crank angle (i.e. the angular position of the crank shaft of the engine in each working cycle when the abnormal sound occurs), i.e. the angular value of the crank shaft of the corresponding engine, for example, 40 °, 400 ° or the like.
Step S50, a target cylinder that generates abnormal noise is determined based on the target crank angle.
In this embodiment, since there is a mapping relationship between the piston stroke (including the intake process and the exhaust process) and the crank angle of each cylinder of the engine, when abnormal noise occurs, the target cylinder that generates abnormal noise in the corresponding engine can be obtained after the target crank angle of the corresponding engine crank is obtained when the engine crank is at the target crank angle.
Further, in an embodiment, referring to fig. 3, the step S50 includes:
step S501, a mapping relation between the piston stroke and the crank angle of each cylinder of the engine is obtained, wherein the piston stroke of each cylinder comprises a working process, an exhaust process, an air inlet process and a compression process;
Step S502, if abnormal sound is related to an air intake system, determining a cylinder with a piston stroke in an air intake process when a crank angle is a target crank angle, and taking the cylinder as a target cylinder for generating abnormal sound;
in step S503, if the abnormal sound is related to the exhaust system, when the crank angle is determined to be the target crank angle, the piston stroke is in the cylinder of the exhaust process, and the cylinder is taken as the target cylinder for generating the abnormal sound.
In the present embodiment, specifically, the step of determining the target cylinder that generates the abnormal sound based on the target crank angle includes: the method comprises the steps of obtaining a mapping relation between piston strokes and crank angles of all cylinders of an engine, wherein the piston strokes of all cylinders comprise a working process, an exhaust process, an air inlet process and a compression process. If the abnormal sound is related to the air intake system, determining that the crank angle is the target crank angle, and taking the cylinder as a target cylinder for generating the abnormal sound, wherein the piston stroke is in the air intake process. If the abnormal sound is related to the exhaust system, determining that the crank angle is the target crank angle, and taking the cylinder as a target cylinder for generating the abnormal sound, wherein the piston stroke is in a cylinder in the exhaust process.
For example, the mapping relationship between the piston stroke and the crank angle of each cylinder of the engine is shown in table 1, when it is determined that the target crank angle is 40 ° and 400 °, if the abnormal sound is related to the intake system, the target crank angle is 40 ° corresponding to 4 cylinders in the intake process, the target crank angle is 400 ° corresponding to 1 cylinder in the intake process, and the 1 cylinder and the 4 cylinder are the target cylinders corresponding to the abnormal sound.
TABLE 1
Further, referring to fig. 4, in an embodiment, after the step S50, the method includes:
step S60, acquiring pressure signals acquired by pressure sensors arranged at the intake manifold or the exhaust manifold of each cylinder;
step S70, performing fast Fourier transform processing on pressure signals corresponding to each cylinder, and converting the pressure signals from time domain signals into frequency spectrum signals;
step S80, comparing the pressure values of the pressure signals of each cylinder in the target frequency band;
in step S90, if the pressure value of the target cylinder is greater than the pressure value of the remaining cylinders, it is determined that the target cylinder and the remaining cylinders have abnormal sounds due to different intake pulsation or exhaust pulsation.
In the present embodiment, after the target cylinder that generates the abnormal sound is determined based on the vibration signal and the noise signal, it may be further determined whether the abnormal sound is caused by the intake pulsation or the exhaust pulsation of the engine target cylinder and the remaining cylinders being different, thereby determining the corresponding improvement measure.
Therefore, a pressure sensor is provided at the intake manifold or the exhaust manifold of each cylinder, and after a target cylinder generating abnormal sound is determined based on the target crank angle, a pressure signal acquired by the pressure sensor provided at the intake manifold or the exhaust manifold of each cylinder is acquired. And performing fast Fourier transform processing on the pressure signals corresponding to each cylinder, and converting the pressure signals from time domain signals into frequency spectrum signals. The magnitude of the pressure value of each cylinder pressure signal is compared to a target frequency band (e.g., 300-500 HZ). If the pressure value of the target cylinder is larger than the pressure value of the residual cylinder, the abnormal sound caused by different air inlet pulsation or exhaust pulsation of the target cylinder and the residual cylinder is determined. In this case, an intake manifold with equal length is installed for the target cylinder and the remaining cylinders, or a resonant cavity with corresponding abnormal sound frequency is installed for the target cylinder, so as to solve the problem of abnormal sound caused by different intake pulsation or exhaust pulsation of the target cylinder and the remaining cylinders of the engine.
In this embodiment, an analysis method for engine airflow noise is provided, including: acquiring vibration signals acquired by a plurality of vibration sensors arranged on an engine and noise signals acquired by a plurality of microphones; determining whether the abnormal sound is related to the air intake and exhaust system based on the vibration signal and the noise signal; if the abnormal sound is determined to be related to the air intake and exhaust system, converting time domain data of the noise signal into a crank angle according to a phase relation between a cam shaft signal, a cylinder ignition signal or a cylinder pressure signal and a crank shaft; determining a target crank angle corresponding to the abnormal response; a target cylinder that generates abnormal sound is determined based on the target crank angle. The abnormal sound is more common and the engine has low rotation speed and high torque working condition corresponds to the idle speed charging working condition of the hybrid electric vehicle type. By applying the analysis method of the engine airflow noise of the invention to the early stage of model development (NVH test development is carried out on the engine bench), the abnormal noise of the air inlet pulsation of the engine can be rapidly identified and improved measures can be taken in the early stage of product development, so that the problem of abnormal noise and the problem of durability of the air inlet system structure caused by uneven pressure can be avoided, and the time and economic loss caused by difficult remanufacturing after late loading can be avoided. The invention can rapidly identify the abnormal noise of the air inlet pulsation of the engine and make improvement measures in the early stage of product development by applying the invention to the early stage of model development, thereby reducing more development cost and improving the efficiency of model and vehicle type development.
In a third aspect, the embodiment of the invention further provides an analysis device for engine airflow noise.
Referring to fig. 5, a functional block diagram of an embodiment of an engine airflow noise analysis apparatus is shown.
In this embodiment, the device for analyzing engine airflow noise includes:
an acquisition module 10 for acquiring vibration signals acquired by a plurality of vibration sensors provided on an engine and noise signals acquired by a plurality of microphones;
a first determining module 20, configured to determine whether the abnormal sound is related to the intake and exhaust system based on the vibration signal and the noise signal;
the conversion module 30 is configured to convert time domain data of the noise signal into a crank angle according to a phase relationship between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal and the crank if it is determined that the abnormal sound is related to the intake and exhaust system;
a second determining module 40 for determining a target crank angle corresponding to the abnormal response;
the third determination module 50 is configured to determine a target cylinder that generates abnormal noise based on the target crank angle.
Further, in an embodiment, the first determining module 20 is specifically configured to:
determining a target frequency segment corresponding to the abnormal sound, and taking the occurrence frequency of the abnormal sound of the target frequency segment in one working cycle of the engine as a target rhythm characteristic;
Performing wavelet analysis processing on the vibration signal and the noise signal to obtain a first analysis chart and a second analysis chart;
if the vibration signal amplitude of the air inlet manifold and the noise signal amplitude of the air inlet are stronger than the signal amplitudes of other frequency bands in the target frequency band in the first analysis chart and the second analysis chart, and the appearance frequency at the position with the larger amplitude is consistent with the target rhythm characteristic, determining that abnormal sound is related to the air inlet system;
if the amplitude of the vibration signal of the exhaust manifold and the amplitude of the noise signal of the exhaust port are stronger than those of signals of other frequency bands in the target frequency band in the first analysis chart and the second analysis chart, and the appearance frequency at the position with the larger amplitude is consistent with the target rhythm characteristic, determining that abnormal sound is related to the exhaust system;
and if the vibration signal amplitude of the air inlet manifold and the air outlet manifold and the noise signal amplitude of the air inlet and the air outlet in the first analysis chart and the second analysis chart are not stronger than the signal amplitudes of other frequency bands in the target frequency band, and the signal amplitudes of the engine cylinder body and the suspension driving side are stronger than the signal amplitudes of other frequency bands in the target frequency band, determining that abnormal sound is irrelevant to the air inlet and the air outlet system.
Further, in an embodiment, the device for analyzing engine airflow noise further includes a verification module, specifically configured to:
Acquiring pressure signals acquired by pressure sensors arranged at an intake manifold or an exhaust manifold of each cylinder;
performing fast Fourier transform processing on pressure signals corresponding to each cylinder, and converting the pressure signals from time domain signals into frequency spectrum signals;
comparing the pressure value of each cylinder pressure signal of the target frequency band;
if the pressure value of the target cylinder is larger than the pressure value of the residual cylinder, the abnormal sound caused by different air inlet pulsation or exhaust pulsation of the target cylinder and the residual cylinder is determined.
Further, in an embodiment, the conversion module 30 is specifically configured to:
according to the phase relation between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal and the crankshaft, a first crankshaft tooth-missing period closest to the starting time of any period of the camshaft signal, the cylinder ignition time or the cylinder pressure peak value time is found, and the ending time of the first crankshaft tooth-missing period is a first time, wherein the first time corresponds to a first crank angle;
determining a first crankshaft spacing angle between a start time and a first time of an engine one cycle based on the engine model;
determining a second crank angle corresponding to a start time of one working cycle of the engine based on the first crank angle and the first crank interval angle;
Based on the second crank angle, time domain data of the noise signal is converted into crank angles corresponding to each working cycle of the engine.
Further, in an embodiment, the third determining module 50 is specifically configured to:
obtaining a mapping relation between the piston stroke and the crank angle of each cylinder of the engine, wherein the piston stroke of each cylinder comprises a working process, an exhaust process, an air inlet process and a compression process;
if the abnormal sound is related to the air inlet system, determining that the crank angle is a target crank angle, and taking the cylinder as a target cylinder for generating the abnormal sound, wherein the piston stroke is in the air inlet process;
if the abnormal sound is related to the exhaust system, determining that the crank angle is the target crank angle, and taking the cylinder as a target cylinder for generating the abnormal sound, wherein the piston stroke is in a cylinder in the exhaust process.
Further, in an embodiment, the vibration sensor is specifically disposed at front and rear ends of the engine cylinder, each suspension active side, the intake manifold and the exhaust manifold; the microphone is specifically arranged at the top end of the engine, the front end of the engine, the air inlet and the air outlet.
The function implementation of each module in the analysis device of the engine airflow noise corresponds to each step in the analysis method embodiment of the engine airflow noise, and the function and implementation process of each module are not described here again.
In a fourth aspect, embodiments of the present invention also provide a readable storage medium.
The readable storage medium of the present invention stores an analysis program of engine airflow noise, wherein the analysis program of engine airflow noise realizes the steps of the analysis method of engine airflow noise when being executed by a processor.
The method implemented when the analysis program of the engine airflow noise is executed may refer to various embodiments of the analysis method of the engine airflow noise of the present invention, which will not be described herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising several instructions for causing a terminal device to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. The method for analyzing the engine airflow noise is characterized by comprising the following steps of:
acquiring vibration signals acquired by a plurality of vibration sensors arranged on an engine and noise signals acquired by a plurality of microphones;
Determining whether the abnormal sound is related to the air intake and exhaust system based on the vibration signal and the noise signal;
if the abnormal sound is determined to be related to the air intake and exhaust system, converting time domain data of the noise signal into a crank angle according to a phase relation between a cam shaft signal, a cylinder ignition signal or a cylinder pressure signal and a crank shaft;
determining a target crank angle corresponding to the abnormal response;
determining a target cylinder that generates abnormal sound based on the target crank angle;
the step of determining whether the abnormal sound is related to the air intake and exhaust system based on the vibration signal and the noise signal comprises the following steps:
determining a target frequency segment corresponding to the abnormal sound, and taking the occurrence frequency of the abnormal sound of the target frequency segment in one working cycle of the engine as a target rhythm characteristic;
performing wavelet analysis processing on the vibration signal and the noise signal to obtain a first analysis chart and a second analysis chart;
if the amplitude of the vibration signal of the air inlet manifold and the amplitude of the noise signal of the air inlet are stronger than the amplitudes of signals of other frequency segments in the target frequency segment in the first analysis graph and the second analysis graph, and the appearance frequency at the position with the larger amplitude is consistent with the target rhythm characteristic, abnormal sound is determined to be related to the air inlet system.
2. The method for analyzing engine airflow noise according to claim 1, wherein the step of determining whether abnormal sound is associated with the intake and exhaust system based on the vibration signal and the noise signal further comprises:
If the amplitude of the vibration signal of the exhaust manifold and the amplitude of the noise signal of the exhaust port are stronger than those of signals of other frequency bands in the target frequency band in the first analysis chart and the second analysis chart, and the appearance frequency at the position with the larger amplitude is consistent with the target rhythm characteristic, determining that abnormal sound is related to the exhaust system;
and if the vibration signal amplitude of the air inlet manifold and the air outlet manifold and the noise signal amplitude of the air inlet and the air outlet in the first analysis chart and the second analysis chart are not stronger than the signal amplitudes of other frequency bands in the target frequency band, and the signal amplitudes of the engine cylinder body and the suspension driving side are stronger than the signal amplitudes of other frequency bands in the target frequency band, determining that abnormal sound is irrelevant to the air inlet and the air outlet system.
3. The method of analyzing engine airflow noise according to claim 2, characterized in that after the step of determining the target cylinder that generates abnormal noise based on the target crank angle, it includes:
acquiring pressure signals acquired by pressure sensors arranged at an intake manifold or an exhaust manifold of each cylinder;
performing fast Fourier transform processing on pressure signals corresponding to each cylinder, and converting the pressure signals from time domain signals into frequency spectrum signals;
Comparing the pressure value of each cylinder pressure signal of the target frequency band;
if the pressure value of the target cylinder is larger than the pressure value of the residual cylinder, the abnormal sound caused by different air inlet pulsation or exhaust pulsation of the target cylinder and the residual cylinder is determined.
4. The method of claim 1, wherein the step of converting time domain data of the noise signal into crank angle based on a phase relationship of the camshaft signal, the cylinder firing signal, or the cylinder pressure signal with the crankshaft comprises:
according to the phase relation between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal and the crankshaft, a first crankshaft tooth-missing period closest to the starting time of any period of the camshaft signal, the cylinder ignition time or the cylinder pressure peak value time is found, and the ending time of the first crankshaft tooth-missing period is a first time, wherein the first time corresponds to a first crank angle;
determining a first crankshaft spacing angle between a start time and a first time of an engine one cycle based on the engine model;
determining a second crank angle corresponding to a start time of one working cycle of the engine based on the first crank angle and the first crank interval angle;
Based on the second crank angle, time domain data of the noise signal is converted into crank angles corresponding to each working cycle of the engine.
5. The method of resolving engine airflow noise according to claim 1, wherein the step of determining the target cylinder that generates the abnormal sound based on the target crank angle includes:
obtaining a mapping relation between the piston stroke and the crank angle of each cylinder of the engine, wherein the piston stroke of each cylinder comprises a working process, an exhaust process, an air inlet process and a compression process;
if the abnormal sound is related to the air inlet system, determining that the crank angle is a target crank angle, and taking the cylinder as a target cylinder for generating the abnormal sound, wherein the piston stroke is in the air inlet process;
if the abnormal sound is related to the exhaust system, determining that the crank angle is the target crank angle, and taking the cylinder as a target cylinder for generating the abnormal sound, wherein the piston stroke is in a cylinder in the exhaust process.
6. The method for analyzing engine airflow noise according to claim 1, wherein: the vibration sensors are specifically arranged at the front end and the rear end of the engine cylinder body, each suspension driving side, the air inlet manifold and the exhaust manifold; the microphone is specifically arranged at the top end of the engine, the front end of the engine, the air inlet and the air outlet.
7. An engine airflow noise analysis device, characterized in that the engine airflow noise analysis device comprises:
the acquisition module is used for acquiring vibration signals acquired by a plurality of vibration sensors arranged on the engine and noise signals acquired by a plurality of microphones;
the first determining module is used for determining a target frequency segment corresponding to the abnormal sound, and taking the occurrence frequency of the abnormal sound of the target frequency segment in one working cycle of the engine as a target rhythm characteristic; performing wavelet analysis processing on the vibration signal and the noise signal to obtain a first analysis chart and a second analysis chart; if the vibration signal amplitude of the air inlet manifold and the noise signal amplitude of the air inlet are stronger than the signal amplitudes of other frequency bands in the target frequency band in the first analysis chart and the second analysis chart, and the appearance frequency at the position with the larger amplitude is consistent with the target rhythm characteristic, determining that abnormal sound is related to the air inlet system;
the conversion module is used for converting time domain data of the noise signal into a crank angle according to the phase relation between a cam shaft signal, a cylinder ignition signal or a cylinder pressure signal and a crank shaft if the abnormal sound is determined to be related to the air intake and exhaust system;
the second determining module is used for determining a target crank angle corresponding to the abnormal response;
And a third determination module for determining a target cylinder generating abnormal sound based on the target crank angle.
8. The engine airflow noise analysis device according to claim 7, wherein the first determination module is further configured to:
if the amplitude of the vibration signal of the exhaust manifold and the amplitude of the noise signal of the exhaust port are stronger than those of signals of other frequency bands in the target frequency band in the first analysis chart and the second analysis chart, and the appearance frequency at the position with the larger amplitude is consistent with the target rhythm characteristic, determining that abnormal sound is related to the exhaust system;
and if the vibration signal amplitude of the air inlet manifold and the air outlet manifold and the noise signal amplitude of the air inlet and the air outlet in the first analysis chart and the second analysis chart are not stronger than the signal amplitudes of other frequency bands in the target frequency band, and the signal amplitudes of the engine cylinder body and the suspension driving side are stronger than the signal amplitudes of other frequency bands in the target frequency band, determining that abnormal sound is irrelevant to the air inlet and the air outlet system.
9. An engine airflow noise analysis apparatus, characterized in that the engine airflow noise analysis apparatus includes a processor, a memory, and an engine airflow noise analysis program stored on the memory and executable by the processor, wherein the engine airflow noise analysis program, when executed by the processor, implements the steps of the engine airflow noise analysis method according to any one of claims 1 to 6.
10. A readable storage medium, wherein a resolving program of engine airflow noise is stored on the readable storage medium, wherein the resolving program of engine airflow noise, when executed by a processor, implements the steps of the resolving method of engine airflow noise according to any one of claims 1 to 6.
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