CN115405418A - 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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Abstract
The invention provides an analysis method, a device, equipment and a readable storage medium for engine airflow noise, wherein the analysis method for 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 abnormal sound is related to an air intake and exhaust system or not based on the vibration signal and the noise signal; if the abnormal sound is determined to be related to an air intake and exhaust system, converting time domain data of the noise signal into a crank angle according to the phase relation between a camshaft signal, a cylinder ignition signal or a cylinder pressure signal of a cylinder and a crankshaft; determining a target crank angle corresponding to the abnormal response; based on the target crank angle, a target cylinder that generates abnormal noise is determined. By applying the method to the early stage of machine type development, the abnormal sound of the air inlet pulsation of the engine can be quickly identified and improved measures can be taken in the early stage of product development, so that more development cost is reduced, and the efficiency of machine type 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, device and equipment for engine airflow noise and a readable storage medium.
Background
The abnormal noise elimination of the engine relates to NVH testing technology and engine principle and structure. The NVH performance level of the whole vehicle can be evaluated through an NVH test, whether the NVH performance level meets the requirements of national mandatory regulations or not is determined, and whether the NVH performance level is competitive or not compared with competitive model vehicles or not is determined. Through the experience of data formation accumulated by NVH test, the NVH performance development can be effectively guided, such as: setting NVH performance design indexes and target values of the whole vehicle and subsystems; the root cause of the vibration noise problem can be found out through NVH test, the effectiveness of the scheme is evaluated, and the purpose of optimizing the NVH performance of the whole vehicle is achieved.
However, in the prior art, a specific scheme for analyzing the noise abnormal sound problem of the whole vehicle or the engine caused by the airflow and obtaining a corresponding improvement scheme based on the analysis result to eliminate the airflow noise is not available.
Disclosure of Invention
The invention mainly aims to provide a method, a device, equipment and a readable storage medium for analyzing engine airflow noise, and aims to solve the technical problem that no analysis scheme for noise abnormal sound generated by airflow of a whole vehicle or an engine exists in the prior art.
In a first aspect, the present invention provides a method for analyzing engine airflow noise, including the 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 abnormal sound is related to an air intake and exhaust system or not based on the vibration signal and the noise signal;
if the abnormal sound is determined to be related to an air intake and exhaust system, converting time domain data of the noise signal into a crank angle according to the phase relation between a camshaft signal, a cylinder ignition signal or a cylinder pressure signal of a cylinder and a crankshaft;
determining a target crank angle corresponding to the abnormal response;
based on the target crank angle, a target cylinder that generates abnormal noise is determined.
Optionally, the step of determining whether the abnormal noise is related to the air intake and exhaust system based on the vibration signal and the noise signal comprises:
determining a target frequency band corresponding to the abnormal sound, and taking the occurrence frequency of the abnormal sound of the target frequency band 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 intake manifold and the noise signal amplitude of the air inlet in the first analysis chart and the second analysis chart are stronger than the signal amplitudes of other frequency sections in a target frequency section, and the occurrence frequency of the position with the larger amplitude is consistent with the target rhythm characteristic, determining that the abnormal sound is related to the intake system;
if the amplitude of the vibration signal of the exhaust manifold and the amplitude of the noise signal of the exhaust port in the first analysis chart and the second analysis chart are stronger than the amplitudes of the vibration signal of the exhaust manifold and the noise signal of the exhaust port in a target frequency section and the occurrence frequency of the position with the larger amplitude is consistent with the target rhythm characteristic, determining that the abnormal sound is related to the exhaust system;
and if in the first analysis chart and the second analysis chart, the vibration signal amplitude of the intake manifold and the exhaust manifold and the noise signal amplitude of the air inlet and the air outlet are not stronger than the signal amplitudes of other frequency sections in a target frequency section, and the signal amplitudes of the engine cylinder body and the suspension driving side are stronger than the signal amplitudes of other frequency sections in the target frequency section, determining that the abnormal sound is irrelevant to the intake and exhaust system.
Optionally, after the step of determining a target cylinder generating abnormal noise based on the target crank angle, the method includes:
acquiring pressure signals acquired by pressure sensors arranged at an air inlet manifold or an exhaust manifold of each cylinder;
carrying out fast Fourier transform processing on the pressure signal corresponding to each cylinder, and converting the pressure signal into a frequency spectrum signal from a time domain signal;
comparing the pressure value of each cylinder pressure signal of the target frequency section;
and if the pressure value of the target cylinder is greater than that of the residual cylinder, determining abnormal sound caused by the difference of the intake pulsation or the exhaust pulsation of the target cylinder and the residual cylinder.
Optionally, the step of converting the 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 crankshaft includes:
according to the phase relation between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal of the cylinder and the crankshaft, finding a first crankshaft tooth missing period which is closest to the starting moment of any period of the camshaft signal, the ignition moment of the cylinder or the cylinder pressure peak moment of the cylinder, wherein the end moment of the first crankshaft tooth missing period is a first moment, and the first moment corresponds to a first crankshaft rotation angle;
determining a first crankshaft interval angle between the starting moment of one working cycle of the engine and a first moment based on the engine model;
determining a second crank angle corresponding to the starting moment of one working cycle of the engine based on the first crank angle and the first crank shaft interval angle;
and converting the time domain data of the noise signal into a crank angle corresponding to each working cycle of the engine based on the second crank angle.
Optionally, the step of determining a target cylinder generating abnormal noise based on the target crank angle includes:
acquiring a mapping relation between a piston stroke and a crank angle of each cylinder of the engine, wherein the piston stroke of each cylinder comprises a work doing process, an exhaust process, an air inlet process and a compression process;
if the abnormal sound is related to the 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 generating the abnormal sound;
and if the abnormal sound is related to the exhaust system, determining the cylinder with the piston stroke in the exhaust process when the crank angle is the target crank angle, and taking the cylinder as the target cylinder generating the abnormal sound.
Optionally, the vibration sensor is specifically arranged at the front end and the rear end of the engine cylinder, at each suspension active side, at the intake manifold and at the exhaust manifold; the acoustic transmitter is 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, including:
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 device comprises a first determination module, a second determination module and a control module, wherein the first determination module is used for determining whether abnormal sound is related to an air intake and exhaust system or not based on a vibration signal and a noise signal;
the conversion module is used for converting time domain data of the noise signal into a crank angle according to a phase relation between a camshaft signal, a cylinder ignition signal or a cylinder pressure signal of a cylinder and a crank if the abnormal sound is determined to be related to an air intake and exhaust system;
the second determination module is used for determining a target crank angle corresponding to the abnormal response;
and the third determination module is used 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 band corresponding to the abnormal sound, and taking the occurrence frequency of the abnormal sound of the target frequency band 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 intake manifold and the noise signal amplitude of the air inlet in the first analysis chart and the second analysis chart are stronger than the signal amplitudes of other frequency sections in a target frequency section, and the occurrence frequency of the position with the larger amplitude is consistent with the target rhythm characteristic, determining that the abnormal sound is related to the intake system;
if the amplitude of the vibration signal of the exhaust manifold and the amplitude of the noise signal of the exhaust port in the first analysis chart and the second analysis chart are stronger than the amplitudes of the vibration signal of the exhaust manifold and the noise signal of the exhaust port in a target frequency section and the occurrence frequency of the position with the larger amplitude is consistent with the target rhythm characteristic, determining that the abnormal sound is related to the exhaust system;
and if in the first analysis chart and the second analysis chart, the vibration signal amplitude of the intake manifold and the exhaust manifold and the noise signal amplitude of the air inlet and the air outlet are not stronger than the signal amplitudes of other frequency sections in a target frequency section, and the signal amplitudes of the engine cylinder body and the suspension driving side are stronger than the signal amplitudes of other frequency sections in the target frequency section, determining that the abnormal sound is irrelevant to the intake and exhaust system.
Optionally, 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 air inlet manifold or an exhaust manifold of each cylinder;
carrying out fast Fourier transform processing on the pressure signal corresponding to each cylinder, and converting the pressure signal into a frequency spectrum signal from a time domain signal;
comparing the pressure value of each cylinder pressure signal of the target frequency section;
and if the pressure value of the target cylinder is greater than that of the residual cylinder, determining abnormal sound caused by the difference of the intake pulsation or the exhaust pulsation of the target cylinder and the residual cylinder.
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 of the cylinder and the crankshaft, finding a first crankshaft tooth missing period which is closest to the starting moment of any period of the camshaft signal, the ignition moment of the cylinder or the cylinder pressure peak moment of the cylinder, wherein the end moment of the first crankshaft tooth missing period is a first moment, and the first moment corresponds to a first crankshaft rotation angle;
determining a first crankshaft interval angle between the starting moment of one working cycle of the engine and a first moment based on the engine model;
determining a second crank angle corresponding to the starting moment of one working cycle of the engine based on the first crank angle and the first crank interval angle;
and converting the time domain data of the noise signal into a crank angle corresponding to each working cycle of the engine based on the second crank angle.
Optionally, the third determining module is specifically configured to:
acquiring a mapping relation between a piston stroke and a crank angle of each cylinder of the engine, wherein the piston stroke of each cylinder comprises a work doing process, an exhaust process, an air inlet process and a compression process;
if the abnormal sound is related to the air intake system, determining a cylinder with a piston stroke in an air intake process when the crank angle is the target crank angle, and taking the cylinder as a target cylinder generating the abnormal sound;
and if the abnormal sound is related to the exhaust system, determining the cylinder with the piston stroke in the exhaust process when the crank angle is the target crank angle, and taking the cylinder as the target cylinder generating the abnormal sound.
Optionally, the vibration sensor is specifically arranged at the front end and the rear end of the engine cylinder, at each suspension active side, at the intake manifold and at the exhaust manifold; the acoustic transmitter is 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 further provides an engine airflow noise analyzing device, which includes a processor, a memory, and an engine airflow noise analyzing program stored on the memory and executable by the processor, wherein when the engine airflow noise analyzing program is executed by the processor, the steps of the engine airflow noise analyzing method as described above are implemented.
In a fourth aspect, the present invention further provides a readable storage medium, on which an engine airflow noise analysis program is stored, wherein when the engine airflow noise analysis program is executed by a processor, the steps of the engine airflow noise analysis method as described above are implemented.
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 abnormal sound is related to an air intake and exhaust system or not based on the vibration signal and the noise signal; if the abnormal sound is determined to be related to an air intake and exhaust system, converting time domain data of the noise signal into a crank angle according to the phase relation between a camshaft signal, a cylinder ignition signal or a cylinder pressure signal of a cylinder and a crankshaft; determining a target crank angle corresponding to the abnormal response; based on the target crank angle, a target cylinder that produces abnormal noise is determined. By applying the method to the early stage of machine type development, the abnormal sound of the air inlet pulsation of the engine can be quickly identified and improved measures can be taken in the early stage of product development, so that more development cost is reduced, and the efficiency of machine type and vehicle type development is improved.
Drawings
FIG. 1 is a schematic diagram of a hardware structure of an engine airflow noise analysis device according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a method for analyzing engine airflow noise according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a method for resolving engine airflow noise according to another embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a method for analyzing engine airflow noise according to yet another embodiment of the present invention;
fig. 5 is a functional block diagram of an embodiment of an apparatus for analyzing engine airflow noise according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
In a first aspect, the embodiment of the invention provides an engine airflow noise analysis device.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware structure of an engine airflow noise analyzing device according to an embodiment of the present invention. In an embodiment of the present invention, the device for analyzing engine airflow noise may include a processor 1001 (e.g., a Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used for realizing connection communication among the 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., a WI-FI interface, WI-FI interface); the memory 1005 may be a Random Access Memory (RAM) or a non-volatile memory (non-volatile memory), such as a disk memory, and the memory 1005 may optionally be a storage device independent of the processor 1001. Those skilled in the art will appreciate that the hardware configuration depicted in FIG. 1 is not intended to be limiting of the present invention, and may include more or less components than those shown, or some components in combination, or a different arrangement of components.
With continued reference to FIG. 1, the memory 1005 of FIG. 1, which is one type of computer storage medium, may include an operating system, a network communication module, a user interface module, and an engine airflow noise analysis program. The processor 1001 may call an analysis program of the engine airflow noise stored in the memory 1005, and execute the method for analyzing the engine airflow noise according to the embodiment of the present invention.
In a second aspect, embodiments of the present invention provide a method for analyzing engine airflow noise.
Referring to fig. 2, fig. 2 is a schematic flow chart of an embodiment of the 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, obtaining vibration signals collected by a plurality of vibration sensors arranged on an engine and noise signals collected by a plurality of microphones;
in the embodiment, a plurality of vibration sensors are arranged at different positions on the engine to acquire vibration signals, and a plurality of microphones are arranged to acquire noise signals. When the striking sound with obvious rhythm appears on the engine, the reason for the striking sound with obvious rhythm appears on the engine needs to be determined, so that vibration signals collected by a plurality of vibration sensors arranged on the engine and noise signals collected by a plurality of microphones are obtained.
Further, in one embodiment, the vibration sensors are specifically arranged at the front end and the rear end of the engine cylinder, at the suspension driving sides, at the intake manifold and at the exhaust manifold; the acoustic transmitter is specifically arranged at the top end of the engine, the front end of the engine, the air inlet and the air outlet.
In the embodiment, whether the noise generated by the whole vehicle or the engine is abnormal due to the air flow is considered, and the air flow noise is generally caused by exhaust pulsation in different cylinders in an air intake and exhaust system of the engine. Therefore, when the vibration sensor and the microphone are correspondingly arranged, the vibration sensor and the microphone need to be arranged at positions where vibration signals and noise signals of the intake and exhaust system can be accurately monitored, so that the accuracy of noise monitoring is improved. Specifically, the vibration sensors are arranged at the front end and the rear end of an engine cylinder body, at the suspension driving sides, at an intake manifold and at an exhaust manifold; the acoustic transmitter is specifically arranged on the main side of the engine: the engine top end is 1m, the engine front end is 1m, and the near fields of the air inlet and the air outlet are arranged.
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 acquired vibration signals and noise signals at different positions of the engine are processed and analyzed, and through comparison of signal amplitudes of the vibration signals and noise signals at different positions of the engine and comparison of characteristics, whether abnormal sound is related to an intake and exhaust system or not can be determined.
Further, in an embodiment, the step S20 includes:
determining a target frequency band corresponding to the abnormal sound, and taking the occurrence frequency of the abnormal sound of the target frequency band 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 intake manifold and the noise signal amplitude of the air inlet in the first analysis chart and the second analysis chart are stronger than the signal amplitudes of other frequency sections in a target frequency section, and the occurrence frequency of the position with the larger amplitude is consistent with the target rhythm characteristic, determining that the abnormal sound is related to the intake system;
if the amplitude of the vibration signal of the exhaust manifold and the amplitude of the noise signal of the exhaust port in the first analysis chart and the second analysis chart are stronger than the amplitudes of the vibration signal of the exhaust manifold and the noise signal of the exhaust port in a target frequency section and the occurrence frequency of the position with the larger amplitude is consistent with the target rhythm characteristic, determining that the abnormal sound is related to the exhaust system;
and if the vibration signal amplitudes of the intake manifold and the exhaust manifold and the noise signal amplitudes of the air inlet and the exhaust port in the first analysis diagram and the second analysis diagram are not stronger than the signal amplitudes of other frequency sections in a target frequency section, and the signal amplitudes of the engine cylinder body and the suspension driving side in the target frequency section are stronger than the signal amplitudes of other frequency sections, determining that the abnormal sound is irrelevant to the intake and exhaust system.
In the present 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 the subjective judgment of the general direction of the abnormal sound, the abnormal sound noise signal is processed, the abnormal sound generated by the engine in a target frequency range is determined, if the striking characteristic with obvious regularity is corresponding to the frequency range of 300-500HZ, the 300-500HZ is taken as the target frequency range corresponding to the abnormal sound, and the occurrence frequency of the abnormal sound of the target frequency range in one working cycle of the engine is taken as the target rhythm characteristic. On the basis, the target frequency band corresponding to the abnormal sound and the target rhythm characteristic are confirmed by combining the subjective result of whether the input noise signal (subjected to filtering processing of the target frequency band) is consistent with the obvious rhythm knocking sound actually appearing in the engine or not.
After the target frequency band and the target rhythm characteristics corresponding to the abnormal sound are confirmed, wavelet analysis processing is carried out on the obtained vibration signals to obtain a first analysis chart, and wavelet analysis processing is carried out on the obtained noise signals to obtain a second analysis chart. And comparing and judging the target frequency section and the target rhythm characteristic of the first analysis chart and the second analysis chart, and confirming whether the signal amplitude of each vibration signal and each noise signal in the target frequency section (such as 300-500 HZ) is stronger than the signal amplitude of other frequency sections on the analysis chart, and whether the occurrence frequency at the position with larger amplitude is consistent with the target rhythm characteristic, thereby determining whether the abnormal sound is related to the air intake and exhaust system.
And if the vibration signal amplitude of the intake manifold and the noise signal amplitude of the air inlet are stronger in a target frequency section than in other frequency sections in the first analysis diagram and the second analysis diagram, and the occurrence frequency of a position with larger amplitude is consistent with the target rhythm characteristic, determining that the abnormal sound is related to the intake system.
And if the amplitude of the vibration signal of the exhaust manifold and the amplitude of the noise signal of the exhaust port in the first analysis diagram and the second analysis diagram are stronger than the amplitudes of the vibration signal of the exhaust manifold and the noise signal of the exhaust port in a target frequency section and the occurrence frequency of the position with the larger amplitude is consistent with the target rhythm characteristic, determining that the abnormal sound is related to the exhaust system.
And if in the first analysis chart and the second analysis chart, the vibration signal amplitude of the intake manifold and the exhaust manifold and the noise signal amplitude of the air inlet and the air outlet are not stronger than the signal amplitudes of other frequency sections in a target frequency section, and the signal amplitudes of the engine cylinder body and the suspension driving side are stronger than the signal amplitudes of other frequency sections in the target frequency section, determining that the abnormal sound is irrelevant to the intake and exhaust system.
Step S30, if the abnormal sound is determined to be related to an air intake and exhaust system, converting time domain data of the noise signal into a crank angle according to the phase relation between a camshaft signal, a cylinder ignition signal or a cylinder pressure signal of a cylinder and a crank;
in this embodiment, if it is determined that the abnormal noise is related to the intake and exhaust systems, it is further determined which cylinder in the intake and exhaust systems of the engine generates the abnormal noise during the intake process or the exhaust process. The collected noise signals are time domain data, so that the time when the abnormal sound corresponding to the target frequency band is generated can be determined based on the time domain data of the first analysis chart and the second analysis chart, but the time when the abnormal sound is generated cannot be determined to correspond to the cylinder in the air intake process or the air exhaust process. Considering that the mapping relation exists between the piston stroke (including the air intake process and the air exhaust process) of each cylinder of the engine and the crank angle, the time domain data of the noise signal can be converted into the crank angle at the moment, and the corresponding relation between the abnormal sound generation time of the target frequency band and the crank angle is determined, so that the target crank angle corresponding to the abnormal sound generation time of the target frequency band is further determined subsequently. The time domain data of the noise signal can be converted into a crank angle according to the phase relation between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal of the cylinder and the crankshaft.
Further, in one embodiment, the step of converting the time domain data of the noise signal into the crank angle according to the phase relationship between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal and the crankshaft comprises:
according to the phase relation between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal of the cylinder and the crankshaft, finding a first crankshaft tooth missing period which is closest to the starting moment of any period of the camshaft signal, the ignition moment of the cylinder or the cylinder pressure peak moment of the cylinder, wherein the end moment of the first crankshaft tooth missing period is a first moment, and the first moment corresponds to a first crankshaft rotation angle;
determining a first crankshaft interval angle between the starting moment of one working cycle of the engine and a first moment based on the engine model;
determining a second crank angle corresponding to the starting moment of one working cycle of the engine based on the first crank angle and the first crank interval angle;
and converting the time domain data of the noise signal into a crank angle corresponding to each working cycle of the engine based on the second crank angle.
In this embodiment, specifically, the step of converting the time domain data of the noise signal into the crank angle according to the phase relationship between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal and the crankshaft includes: according to the phase relation between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal of the cylinder and the crankshaft, finding a first crankshaft tooth missing period which is closest to the starting moment of any period of the camshaft signal, the cylinder ignition moment or the cylinder pressure peak moment of the cylinder, wherein the moment when the first crankshaft tooth missing period ends is a first moment, and the first moment corresponds to a first crankshaft rotation angle.
Wherein, for the same engine model, the cylinder top dead center time (i.e. the starting time of one working cycle of the corresponding engine) and the first crankshaft interval angle at the first time are the same. 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 of the crank angle, so that the time domain data of the noise signal can be converted into the crank angle corresponding to each working cycle of the engine. Therefore, after the first crank angle corresponding to the first time is determined, a first crank angle interval between the starting time of one working cycle of the engine and the first time can be determined based on the engine model. And determining a second crank angle corresponding to the starting moment of one working cycle of the engine based on the first crank angle and the first crank shaft interval angle. And converting the time domain data of the noise signal into a crank angle corresponding to each working cycle of the engine based on the second crank angle.
For example, if it is determined that T1 to T3 on the analysis chart are two times the missing tooth signal of the crankshaft, the interval is 720 ° for one engine operating cycle. According to the phase relation between the crankshaft and the camshaft, the crankshaft missing tooth signal corresponding to the camshaft signal tooth corresponding to the T1 moment is separated from the 1 cylinder top dead center angle by 78 degrees, and the T1+78 degrees can obtain the top dead center moment T2. And converting the time domain data corresponding to each moment on the analysis diagram into the crank angle of the engine in each working cycle by taking T2 as a starting point and taking T3+78 degrees as 720 degrees.
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 relationship between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal and the crankshaft, the abnormal sound generation time of the target frequency band can be determined to obtain the corresponding target crank angle (i.e. the rotation angle position of the crankshaft in each working cycle of the engine when the abnormal sound occurs), i.e. the rotation angle value of the corresponding engine crankshaft, e.g. 40 ° or 400 °, when the abnormal sound occurs.
And S50, determining a target cylinder generating abnormal sound 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) of each cylinder of the engine and the crank angle, after the target crank angle of the corresponding engine crankshaft when abnormal noise occurs is obtained, the target cylinder corresponding to the abnormal noise occurring in the engine when the engine crankshaft is at the target crank angle can be obtained.
Further, in an embodiment, referring to fig. 3, the step S50 includes:
step S501, obtaining a mapping relation between a piston stroke and a crank angle of each cylinder of the engine, wherein the piston stroke of each cylinder comprises a work applying process, an exhaust process, an air inlet process and a compression process;
step S502, if the abnormal sound is related to an air inlet system, when the crank angle is determined to be the target crank angle, the cylinder with the piston stroke in the air inlet process is determined, and the cylinder is taken as the target cylinder generating the abnormal sound;
and S503, if the abnormal sound is related to the exhaust system, determining the cylinder with the piston stroke in the exhaust process when the crank angle is the target crank angle, and taking the cylinder as the target cylinder generating the abnormal sound.
In the present embodiment, specifically, the step of determining the target cylinder producing abnormal noise based on the target crank angle includes: and acquiring 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 work doing process, an exhaust process, an air inlet process and a compression process. And if the abnormal sound is related to the air intake system, determining a cylinder with a piston stroke in an air intake process when the crank angle is the target crank angle, and taking the cylinder as the target cylinder generating the abnormal sound. And if the abnormal sound is related to the exhaust system, determining the cylinder with the piston stroke in the exhaust process when the crank angle is the target crank angle, and taking the cylinder as the target cylinder generating the abnormal sound.
For example, the mapping relationship between the piston stroke and the crank angle of each cylinder of the engine is shown in table 1, and when the target crank angle is determined to be 40 ° and 400 °, if the abnormal noise is related to the intake system, the target crank angle is 40 ° and corresponds to 4 cylinders in the intake process, the target crank angle is 400 ° and corresponds to 1 cylinder in the intake process, and the 1 cylinder and the 4 cylinders are target cylinders in which the abnormal noise is generated.
TABLE 1
Further, in an embodiment, referring to fig. 4, after the step S50, the method includes:
step S60, acquiring pressure signals collected by pressure sensors arranged at an intake manifold or an exhaust manifold of each cylinder;
step S70, carrying out fast Fourier transform processing on the pressure signals corresponding to each cylinder, and converting the pressure signals into frequency spectrum signals from time domain signals;
s80, comparing the pressure values of the pressure signals of the cylinders in the target frequency section;
and step S90, if the pressure value of the target cylinder is greater than that of the residual cylinder, determining abnormal sound caused by difference of intake pulsation or exhaust pulsation of the target cylinder and the residual cylinder.
In the present embodiment, after the target cylinder that generates abnormal noise is determined based on the vibration signal and the noise signal, it is possible to further determine whether the abnormal noise is caused by a difference in intake pulsation or exhaust pulsation between the target cylinder of the engine and the remaining cylinders, thereby determining a corresponding improvement measure.
Therefore, a pressure sensor is arranged at the air inlet manifold or the air outlet manifold of each cylinder, and after the target cylinder generating abnormal noise is determined based on the target crank angle, a pressure signal collected by the pressure sensor arranged at the air inlet manifold or the air outlet manifold of each cylinder is obtained. And performing fast Fourier transform processing on the pressure signals corresponding to the cylinders, and converting the pressure signals into frequency spectrum signals from time domain signals. Comparing the pressure value of each cylinder pressure signal of the target frequency range (such as 300-500 HZ). And if the pressure value of the target cylinder is greater than that of the residual cylinder, determining abnormal sound caused by difference of the intake pulsation or exhaust pulsation of the target cylinder and the residual cylinder. At the moment, equal-length intake manifolds are arranged for the target cylinder and the rest cylinders, or resonant cavities with corresponding abnormal sound frequencies are arranged for the target cylinder, so that the abnormal sound problem caused by different intake pulsation or exhaust pulsation of the target cylinder and the rest cylinders of the engine can be solved.
In this embodiment, a method for analyzing engine airflow noise includes: 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 abnormal sound is related to an air intake and exhaust system or not based on the vibration signal and the noise signal; if the abnormal sound is determined to be related to an air intake and exhaust system, converting time domain data of the noise signal into a crank angle according to the phase relation between a camshaft signal, a cylinder ignition signal or a cylinder pressure signal of a cylinder and a crankshaft; determining a target crank angle corresponding to the abnormal response; based on the target crank angle, a target cylinder that produces abnormal noise is determined. The above abnormal sound is generally frequently generated and the engine is in a low-speed and high-torque working condition, and corresponds to an idling charging working condition of a hybrid vehicle type. By applying the analysis method of the engine airflow noise to the early stage of machine type development (NVH test development on an engine bench), the intake pulsation abnormal noise of the engine can be quickly identified in the early stage of product development, and improvement measures can be taken so as to avoid the durability problem of the intake system structure caused by the abnormal noise problem and pressure unevenness and time and economic losses caused by difficulty in remanufacturing after loading in the later stage. By applying the method to the early stage of machine type development, the abnormal sound of the air inlet pulsation of the engine can be quickly identified and improved measures can be taken in the early stage of product development, so that more development cost is reduced, and the efficiency of machine type and vehicle type development is improved.
In a third aspect, an embodiment of the present invention further provides an apparatus for analyzing engine airflow noise.
Referring to fig. 5, a functional module diagram of an embodiment of the device for analyzing the engine airflow noise is shown.
In this embodiment, the device for analyzing engine airflow noise includes:
the system comprises an acquisition module 10, a processing module and a control module, wherein the acquisition module is used for acquiring vibration signals acquired by a plurality of vibration sensors arranged on an engine and noise signals acquired by a plurality of microphones;
the first determination module 20 is used for determining whether abnormal sound is related to an air intake and exhaust system or not 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 a camshaft signal, a cylinder ignition signal, or a cylinder pressure signal of a cylinder and a crankshaft if it is determined that the abnormal sound is related to an intake and exhaust system;
the second determination module 40 is used for determining a target crank angle corresponding to the abnormal response;
the third determination module 50 is configured to determine a target cylinder that produces an abnormal sound based on a target crank angle.
Further, in an embodiment, the first determining module 20 is specifically configured to:
determining a target frequency band corresponding to the abnormal sound, and taking the occurrence frequency of the abnormal sound of the target frequency band 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 intake manifold and the noise signal amplitude of the air inlet in the first analysis chart and the second analysis chart are stronger than the signal amplitudes of other frequency sections in a target frequency section, and the occurrence frequency of the position with the larger amplitude is consistent with the target rhythm characteristic, determining that the abnormal sound is related to the intake system;
if the amplitude of the vibration signal of the exhaust manifold and the amplitude of the noise signal of the exhaust port in the first analysis chart and the second analysis chart are stronger than the amplitudes of the vibration signal of the exhaust manifold and the noise signal of the exhaust port in a target frequency section and the occurrence frequency of the position with the larger amplitude is consistent with the target rhythm characteristic, determining that the abnormal sound is related to the exhaust system;
and if in the first analysis chart and the second analysis chart, the vibration signal amplitude of the intake manifold and the exhaust manifold and the noise signal amplitude of the air inlet and the air outlet are not stronger than the signal amplitudes of other frequency sections in a target frequency section, and the signal amplitudes of the engine cylinder body and the suspension driving side are stronger than the signal amplitudes of other frequency sections in the target frequency section, determining that the abnormal sound is irrelevant to the intake and exhaust system.
Further, in an embodiment, 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 air inlet manifold or an exhaust manifold of each cylinder;
carrying out fast Fourier transform processing on the pressure signals corresponding to each cylinder, and converting the pressure signals into frequency spectrum signals from time domain signals;
comparing the pressure value of each cylinder pressure signal of the target frequency section;
and if the pressure value of the target cylinder is greater than that of the residual cylinder, determining abnormal sound caused by the difference of the intake pulsation or the exhaust pulsation of the target cylinder and the residual cylinder.
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 of the cylinder and the crankshaft, finding a first crankshaft tooth missing period which is closest to the starting moment of any period of the camshaft signal, the ignition moment of the cylinder or the cylinder pressure peak moment of the cylinder, wherein the end moment of the first crankshaft tooth missing period is a first moment, and the first moment corresponds to a first crankshaft rotation angle;
determining a first crankshaft interval angle between the starting moment of one working cycle of the engine and a first moment based on the engine model;
determining a second crank angle corresponding to the starting moment of one working cycle of the engine based on the first crank angle and the first crank interval angle;
and converting the time domain data of the noise signal into a crank angle corresponding to each working cycle of the engine based on the second crank angle.
Further, in an embodiment, the third determining module 50 is specifically configured to:
acquiring a mapping relation between a piston stroke and a crank angle of each cylinder of the engine, wherein the piston stroke of each cylinder comprises a work doing process, an exhaust process, an air inlet process and a compression process;
if the abnormal sound is related to the air intake system, determining a cylinder with a piston stroke in an air intake process when the crank angle is the target crank angle, and taking the cylinder as a target cylinder generating the abnormal sound;
and if the abnormal sound is related to the exhaust system, determining the cylinder with the piston stroke in the exhaust process when the crank angle is the target crank angle, and taking the cylinder as the target cylinder generating the abnormal sound.
Further, in one embodiment, the vibration sensors are specifically arranged at the front end and the rear end of the engine cylinder, at the suspension driving sides, at the intake manifold and at the exhaust manifold; the acoustic transmitter is 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 for the engine airflow noise corresponds to each step in the analysis method embodiment for the engine airflow noise, and the function and implementation process are not described in detail herein.
In a fourth aspect, the embodiment of the present invention further provides a readable storage medium.
The readable storage medium of the invention stores an analysis program of the engine airflow noise, wherein the analysis program of the engine airflow noise is executed by a processor to realize the steps of the analysis method of the engine airflow noise.
The method for analyzing the engine airflow noise when the analysis program of the engine airflow noise is executed may refer to each embodiment of the method for analyzing the engine airflow noise of the present invention, and will not be described herein again.
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 phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or system comprising the element.
The above-mentioned serial numbers of the embodiments of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for causing a terminal device to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An engine airflow noise analysis method, characterized by comprising:
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 abnormal sound is related to an air intake and exhaust system or not based on the vibration signal and the noise signal;
if the abnormal sound is determined to be related to an air intake and exhaust system, converting time domain data of the noise signal into a crank angle according to a phase relation between a camshaft signal, a cylinder ignition signal or a cylinder pressure signal of a cylinder and a crankshaft;
determining a target crank angle corresponding to the abnormal response;
based on the target crank angle, a target cylinder that generates abnormal noise is determined.
2. The method for resolving engine airflow noise according to claim 1, wherein the step of determining whether an abnormal sound is related to an intake and exhaust system based on the vibration signal and the noise signal comprises:
determining a target frequency band corresponding to the abnormal sound, and taking the occurrence frequency of the abnormal sound of the target frequency band 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 intake manifold and the noise signal amplitude of the air inlet in the first analysis chart and the second analysis chart are stronger than the signal amplitudes of other frequency sections in a target frequency section, and the occurrence frequency of the position with the larger amplitude is consistent with the target rhythm characteristic, determining that the abnormal sound is related to the intake system;
if the amplitude of the vibration signal of the exhaust manifold and the amplitude of the noise signal of the exhaust port in the first analysis chart and the second analysis chart are stronger than the amplitudes of the vibration signal of the exhaust manifold and the noise signal of the exhaust port in a target frequency section and the occurrence frequency of the position with the larger amplitude is consistent with the target rhythm characteristic, determining that the abnormal sound is related to the exhaust system;
and if the vibration signal amplitudes of the intake manifold and the exhaust manifold and the noise signal amplitudes of the air inlet and the exhaust port in the first analysis diagram and the second analysis diagram are not stronger than the signal amplitudes of other frequency sections in a target frequency section, and the signal amplitudes of the engine cylinder body and the suspension driving side in the target frequency section are stronger than the signal amplitudes of other frequency sections, determining that the abnormal sound is irrelevant to the intake and exhaust system.
3. The method of resolving engine airflow noise according to claim 2, characterized by comprising, after the step of determining a target cylinder that produces abnormal noise based on a target crank angle:
acquiring pressure signals acquired by pressure sensors arranged at an air inlet manifold or an exhaust manifold of each cylinder;
carrying out fast Fourier transform processing on the pressure signals corresponding to each cylinder, and converting the pressure signals into frequency spectrum signals from time domain signals;
comparing the pressure value of each cylinder pressure signal of the target frequency section;
and if the pressure value of the target cylinder is greater than that of the residual cylinder, determining abnormal sound caused by the difference of the intake pulsation or the exhaust pulsation of the target cylinder and the residual cylinder.
4. The method for resolving engine airflow noise according to claim 1, wherein the step of converting the time domain data of the noise signal into a crank angle according to the phase relationship between the camshaft signal, the cylinder firing signal or the cylinder pressure signal and the crankshaft comprises:
according to the phase relation between the camshaft signal, the cylinder ignition signal or the cylinder pressure signal of the cylinder and the crankshaft, finding a first crankshaft tooth missing period which is closest to the starting moment of any period of the camshaft signal, the ignition moment of the cylinder or the cylinder pressure peak moment of the cylinder, wherein the end moment of the first crankshaft tooth missing period is a first moment, and the first moment corresponds to a first crankshaft rotation angle;
determining a first crankshaft interval angle between the starting moment of one working cycle of the engine and a first moment based on the engine model;
determining a second crank angle corresponding to the starting moment of one working cycle of the engine based on the first crank angle and the first crank shaft interval angle;
and converting the time domain data of the noise signal into the crank angle corresponding to each working cycle of the engine based on the second crank angle.
5. The method of resolving engine airflow noise as set forth in claim 1, wherein the step of determining a target cylinder producing abnormal noise based on a target crank angle includes:
acquiring a mapping relation between a piston stroke and a crank angle of each cylinder of the engine, wherein the piston stroke of each cylinder comprises a work doing process, an exhaust process, an air inlet process and a compression process;
if the abnormal sound is related to the air intake system, determining a cylinder with a piston stroke in an air intake process when the crank angle is the target crank angle, and taking the cylinder as a target cylinder generating the abnormal sound;
and if the abnormal sound is related to the exhaust system, determining the cylinder with the piston stroke in the exhaust process when the crank angle is the target crank angle, and taking the cylinder as the target cylinder generating the abnormal sound.
6. The method of resolving engine airflow noise according to claim 1, characterized in that: the vibration sensors are specifically arranged at the front end and the rear end of the engine cylinder body, at the suspension driving sides, at the air inlet manifold and at the exhaust manifold; the acoustic transmitter is arranged at the top end of the engine, the front end of the engine, the air inlet and the air outlet.
7. An apparatus for analyzing engine airflow noise, comprising:
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 device comprises a first determination module, a second determination module and a control module, wherein the first determination module is used for determining whether abnormal sound is related to an air intake and exhaust system or not based on a vibration signal and a 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 camshaft signal, a cylinder ignition signal or a cylinder pressure signal of a cylinder and a crank if the abnormal sound is determined to be related to an air intake and exhaust system;
the second determination module is used for determining a target crank angle corresponding to the abnormal response;
and the third determination module is used for determining a target cylinder generating abnormal sound based on the target crank angle.
8. The apparatus for engine airflow noise resolution according to claim 7, wherein the first determining module is specifically configured to:
determining a target frequency band corresponding to the abnormal sound, and taking the occurrence frequency of the abnormal sound of the target frequency band 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 intake manifold and the noise signal amplitude of the air inlet in the first analysis chart and the second analysis chart are stronger than the signal amplitudes of other frequency sections in a target frequency section, and the occurrence frequency of the position with the larger amplitude is consistent with the target rhythm characteristic, determining that the abnormal sound is related to the intake system;
if the amplitude of the vibration signal of the exhaust manifold and the amplitude of the noise signal of the exhaust port in the first analysis chart and the second analysis chart are stronger than the amplitudes of the vibration signal of the exhaust manifold and the noise signal of the exhaust port in a target frequency section and the occurrence frequency of the position with the larger amplitude is consistent with the target rhythm characteristic, determining that the abnormal sound is related to the exhaust system;
and if the vibration signal amplitudes of the intake manifold and the exhaust manifold and the noise signal amplitudes of the air inlet and the exhaust port in the first analysis diagram and the second analysis diagram are not stronger than the signal amplitudes of other frequency sections in a target frequency section, and the signal amplitudes of the engine cylinder body and the suspension driving side in the target frequency section are stronger than the signal amplitudes of other frequency sections, determining that the abnormal sound is irrelevant to the intake and exhaust system.
9. An engine airflow noise resolving device comprising a processor, a memory, and an engine airflow noise resolving program stored on the memory and executable by the processor, wherein the engine airflow noise resolving program when executed by the processor implements the steps of the engine airflow noise resolving method according to any one of claims 1 to 6.
10. A readable storage medium having stored thereon an engine airflow noise analysis program, wherein the engine airflow noise analysis program when executed by a processor implements the steps of the engine airflow noise analysis method according to any one of claims 1 to 6.
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005188297A (en) * | 2003-12-24 | 2005-07-14 | Nippon Soken Inc | Knocking detection device |
| FR2878574A1 (en) * | 2004-11-26 | 2006-06-02 | Bosch Gmbh Robert | METHOD FOR MANAGING A MULTI-CYLINDER INTERNAL COMBUSTION ENGINE |
| US20140172280A1 (en) * | 2011-07-28 | 2014-06-19 | Hitachi Automotive Systems, Ltd. | Method for detecting combustion noise in internal combustion engine, combustion noise detection device, and device for controlling internal combustion engine |
| CN104047794A (en) * | 2013-03-15 | 2014-09-17 | 通用汽车环球科技运作有限责任公司 | Engine knock detection system and method |
| CN104781528A (en) * | 2013-01-24 | 2015-07-15 | 丰田自动车株式会社 | Device for controlling internal combustion engine |
| US20160265453A1 (en) * | 2015-03-13 | 2016-09-15 | General Electric Company | Joint time-frequency and wavelet analysis of knock sensor signal |
| CN107525680A (en) * | 2016-06-17 | 2017-12-29 | 通用汽车环球科技运作有限责任公司 | The method for identifying the trouble unit in automotive system |
| CN107667212A (en) * | 2015-04-01 | 2018-02-06 | 通用电气公司 | For characterizing the detonation sensor network system and method for noise |
| JP2018172995A (en) * | 2017-03-31 | 2018-11-08 | ダイハツ工業株式会社 | Control device of internal combustion engine |
| CN109642505A (en) * | 2016-06-28 | 2019-04-16 | 伊顿智能动力有限公司 | Resonate management strategy |
| CN111577456A (en) * | 2019-02-19 | 2020-08-25 | 上海汽车集团股份有限公司 | Control method, device and system of noise reduction device and vehicle |
| CN111997758A (en) * | 2020-09-04 | 2020-11-27 | 东风汽车集团有限公司 | Abnormal sound diagnosis method for engine valve mechanism |
| CN114109636A (en) * | 2022-01-26 | 2022-03-01 | 潍柴动力股份有限公司 | Combustion control method for improving NVH performance of engine and engine |
-
2022
- 2022-08-03 CN CN202210927245.3A patent/CN115405418B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005188297A (en) * | 2003-12-24 | 2005-07-14 | Nippon Soken Inc | Knocking detection device |
| FR2878574A1 (en) * | 2004-11-26 | 2006-06-02 | Bosch Gmbh Robert | METHOD FOR MANAGING A MULTI-CYLINDER INTERNAL COMBUSTION ENGINE |
| US20140172280A1 (en) * | 2011-07-28 | 2014-06-19 | Hitachi Automotive Systems, Ltd. | Method for detecting combustion noise in internal combustion engine, combustion noise detection device, and device for controlling internal combustion engine |
| CN104781528A (en) * | 2013-01-24 | 2015-07-15 | 丰田自动车株式会社 | Device for controlling internal combustion engine |
| CN104047794A (en) * | 2013-03-15 | 2014-09-17 | 通用汽车环球科技运作有限责任公司 | Engine knock detection system and method |
| CN105971729A (en) * | 2015-03-13 | 2016-09-28 | 通用电气公司 | Joint time-frequency and wavelet analysis of knock sensor signal |
| US20160265453A1 (en) * | 2015-03-13 | 2016-09-15 | General Electric Company | Joint time-frequency and wavelet analysis of knock sensor signal |
| CN107667212A (en) * | 2015-04-01 | 2018-02-06 | 通用电气公司 | For characterizing the detonation sensor network system and method for noise |
| CN107525680A (en) * | 2016-06-17 | 2017-12-29 | 通用汽车环球科技运作有限责任公司 | The method for identifying the trouble unit in automotive system |
| CN109642505A (en) * | 2016-06-28 | 2019-04-16 | 伊顿智能动力有限公司 | Resonate management strategy |
| JP2018172995A (en) * | 2017-03-31 | 2018-11-08 | ダイハツ工業株式会社 | Control device of internal combustion engine |
| CN111577456A (en) * | 2019-02-19 | 2020-08-25 | 上海汽车集团股份有限公司 | Control method, device and system of noise reduction device and vehicle |
| CN111997758A (en) * | 2020-09-04 | 2020-11-27 | 东风汽车集团有限公司 | Abnormal sound diagnosis method for engine valve mechanism |
| CN114109636A (en) * | 2022-01-26 | 2022-03-01 | 潍柴动力股份有限公司 | Combustion control method for improving NVH performance of engine and engine |
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| Publication number | Publication date |
|---|---|
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