CN115509124A - Method and system for identifying and establishing engine vibration model - Google Patents
Method and system for identifying and establishing engine vibration model Download PDFInfo
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Abstract
The invention provides a method for identifying and establishing an engine vibration model, which comprises the following steps: independent variable steps: processing the acquired rotating speed signal of the engine, and calculating to obtain rotating speed data and relative position of the engine to serve as independent variables required for constructing a vibration model; dependent variable step: processing the acquired vibration signal of the engine, and extracting a characteristic value of a vibration quantity to be used as a dependent variable required by constructing a vibration model; modeling: and constructing the vibration model based on the rotation speed data, the relative position and the characteristic value. The invention can establish the vibration model transmitted to the suspension and the automobile frame on the premise of not carrying out structural modeling, mechanical modeling and suspension modeling on the engine; in addition, the model established according to the method can accurately reflect the vibration actually transmitted to the automobile frame by the engine, and can be more quickly and better applied to the research on the active control technology of the engine suspension vibration.
Description
Technical Field
The invention relates to the technical field of active control of automobile engine vibration, in particular to a method and a system for identifying and establishing an engine vibration model.
Background
With the improvement of the social living standard and the development of automobile technology, people have higher and higher requirements on the riding comfort of automobiles, and the riding comfort becomes an important index for measuring the performance of the automobiles and also becomes a function which is very concerned by consumers. Currently, an engine mount active control system plays a very important role in improving the riding comfort of an automobile. In a general engine mount active control system, an engine vibration model needs to be obtained in order to improve the control effect. In a general modeling method, a vibration model of an engine needs to be analyzed according to parameters such as the structural size of the engine, and meanwhile, the vibration model transmitted to a frame by the engine needs to be calculated according to a suspended model and an installation mode so as to analyze the vibration generated by the engine and transmitted to a vehicle body. By adopting the mode, a large number of researchers in the engine profession are required to carry out a large number of experiments, calculations and modeling, the cost is huge, the working period is long, and the promotion of technical research is not facilitated.
In the field of engine fault analysis, an engineering technical researcher provides an identification and analysis method to obtain the amplitude of vibration acceleration of an engine and the relation between characteristic frequency and rotating speed, but the relation cannot be used for completely constructing a vibration acceleration signal, and cannot be used for vibration active control in an engine suspension active control system.
Therefore, the invention provides a method and a system for identifying and establishing an engine vibration model.
Disclosure of Invention
The invention aims to overcome the defects of the existing method and provide a novel identification method and a novel identification system, so that the identification of the engine active suspension vibration model can be rapidly completed under the condition that engineering technical researchers have low understanding degree on the engine, and a model basis is provided for the active control of the engine suspension vibration.
To solve the problems in the prior art, the present invention provides a method for identifying and building an engine vibration model, comprising the following steps:
independent variable step: processing the acquired rotating speed signal of the engine, and calculating to obtain rotating speed data and relative position of the engine to serve as independent variables required for constructing a vibration model;
dependent variable step: processing the acquired vibration signal of the engine, and extracting a characteristic value of a vibration quantity to be used as a dependent variable required by constructing the vibration model;
modeling: and constructing and obtaining the vibration model based on the rotating speed data, the relative position and the characteristic value.
According to one embodiment of the invention, the method further comprises the steps of:
and judging the state of the engine, and acquiring the rotating speed signal and the vibration signal when the transmitter is in the running state.
According to an embodiment of the present invention, the independent variable step specifically comprises the following steps:
and arranging a mark module on a rotating part of the rotating speed signal transceiving equipment, recording a rising edge signal of the output voltage of the mark module, and calculating to obtain the relative position through the rising edge signal.
According to an embodiment of the present invention, the independent variable step specifically comprises the steps of:
and when the mark module rotates to the range of the measuring part of the rotating speed signal transceiving equipment, the measuring part reads the rising edge signal.
According to an embodiment of the present invention, the dependent variable step specifically includes the steps of:
and reading the vibration signal at a fixed receiving frequency, representing by acc, and analyzing by a preset processing method to obtain the characteristic value.
According to one embodiment of the present invention, the preset processing method includes but is not limited to: fourier transform, wavelet transform, band pass filtering.
According to one embodiment of the invention, the vibration model is expressed as:
wherein y represents the calculated vibration value, acccreq represents the characteristic value, phase represents the relative position, phase i represents the relative position n Representing the parameter to be determined, speed representing the rotational speed.
According to an embodiment of the invention, the modeling step comprises in particular the steps of:
and comparing and analyzing the y value and the vibration signal acc of the engine by adopting a fitting degree analysis mode, and considering that the accuracy of the vibration model meets the requirement when the fitting degree reaches above a preset value.
According to another aspect of the invention, there is also provided a storage medium containing a series of instructions for carrying out the steps of the method as described above.
According to another aspect of the present invention, there is also provided a system for identifying and modeling engine vibration, the system being identified and modeled by a method as defined in any one of the above, the system comprising:
an engine for a vehicle, the engine having a motor,
the rotating speed signal transceiving equipment is used for acquiring a rotating speed signal of the engine;
the vibration signal transceiving equipment is used for acquiring a vibration signal of the engine;
the signal acquisition equipment is used for transmitting the rotating speed signal transmitted by the rotating speed signal transceiving equipment and the vibration signal transmitted by the vibration signal transceiving equipment;
a signal processing device configured to:
processing the acquired rotating speed signal of the engine, and calculating to obtain rotating speed data and relative position of the engine to serve as independent variables required for constructing a vibration model;
processing the acquired vibration signal of the engine, and extracting a characteristic value of a vibration quantity to be used as a dependent variable required by constructing the vibration model;
and constructing and obtaining the vibration model based on the rotating speed data, the relative position and the characteristic value.
The method and the system for identifying and establishing the engine vibration model can establish the vibration model transmitted to the suspension and the automobile frame on the premise of not carrying out structural modeling, mechanical modeling and suspension modeling on the engine; in addition, the model established according to the method can accurately reflect the vibration actually transmitted to the automobile frame by the engine, and can be more quickly and better applied to the active control research of the engine suspension vibration.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 illustrates a flow diagram of a method of identifying a model of engine vibration according to one embodiment of the present invention;
FIG. 2 illustrates a schematic diagram of a system for identifying and modeling engine vibrations, according to an embodiment of the present invention;
FIG. 3 shows a schematic diagram of a tachometer signal transceiver apparatus according to an embodiment of the present invention; and
fig. 4 shows a comparison of the y-value with the original data acc value according to an embodiment of the invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings.
FIG. 1 illustrates a flow diagram of a method of identifying a model of engine vibration according to one embodiment of the present invention.
As shown in fig. 1, in step S101, the independent variable step processes the acquired engine speed signal, and calculates the engine speed data and the relative position as the independent variable required for constructing the vibration model.
Specifically, the state of the engine is judged, and when the transmitter is in the running state, a rotating speed signal and a vibration signal are collected at the same time.
In one embodiment, a mark module is arranged on a rotating part of the rotating speed signal transceiving equipment, a rising edge signal of the output voltage of the mark module is recorded, and the relative position is calculated through the rising edge signal. When the mark module rotates to the range of the measuring part of the rotating speed signal transceiving equipment, the measuring part reads a rising edge signal.
It should be noted that the rotation speed signal obtained by the present invention is calculated by a pulse signal, and may also be read from other devices on the vehicle by using a communication method, such as CAN communication, ethernet communication, etc., and the present invention does not limit the manner of obtaining the rotation speed signal.
As shown in fig. 1, in step S102, the dependent variable step processes the acquired vibration signal of the engine, and extracts a feature value of the vibration amount as a dependent variable required for constructing the vibration model.
Specifically, the vibration signal is read at a fixed reception frequency, denoted by acc, and analyzed by a preset processing method to obtain a characteristic value. The predetermined processing method includes, but is not limited to: fourier transform, wavelet transform, band pass filtering.
As shown in fig. 1, in step S103, the modeling step constructs a vibration model based on the rotation speed data, the relative position, and the characteristic value.
In one embodiment, the vibration model is expressed as:
wherein y represents the calculated vibration value, acccreq represents the characteristic value, phase represents the relative position, phase i represents the relative position n Representing the parameter to be determined and speed representing the rotational speed.
Further, the modeling step specifically comprises the following steps: and comparing and analyzing the y value and the vibration signal acc of the engine by adopting a fitting degree analysis mode, and determining that the accuracy of the vibration model meets the requirement when the fitting degree reaches above a preset value.
The method and the system for identifying and establishing the engine vibration model can also be matched with a computer readable storage medium, wherein a computer program is stored on the storage medium, and the computer program is executed to run the method for identifying and establishing the engine vibration model. The computer program is capable of executing computer instructions comprising computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc.
The computer-readable storage medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like.
It should be noted that the content of the computer readable storage medium may be increased or decreased as required by legislation and patent practice in the jurisdiction, for example, in some jurisdictions, the computer readable storage medium does not include electrical carrier signals and telecommunication signals in accordance with legislation and patent practice.
FIG. 2 illustrates a schematic diagram of a system for identifying and modeling engine vibrations, according to an embodiment of the present invention.
As shown in fig. 2, the system for identifying and establishing the engine vibration model includes a signal processing device 1, a signal collecting device 2, a rotational speed signal transceiving device 3, an engine 4, a suspension 5, a vibration signal transceiving device 6, and an automobile frame 7.
The rotating speed signal transceiving equipment 3 is used for acquiring a rotating speed signal of the engine 4. The vibration signal transceiving equipment 6 is used for acquiring a vibration signal of the engine 4. The signal acquisition device 2 is used for transmitting the rotating speed signal transmitted by the rotating speed signal transceiving device 3 and the vibration signal transmitted by the vibration signal transceiving device 6, and transmitting the signals to the signal processing device 1.
The signal processing device 1 is configured to perform the steps of:
processing the acquired rotating speed signal of the engine 4, and calculating to obtain rotating speed data and relative position of the engine 4 to serve as independent variables required for constructing a vibration model; processing the acquired vibration signal of the engine 4, and extracting a characteristic value of a vibration quantity to be used as a dependent variable required by constructing a vibration model; and constructing to obtain a vibration model based on the rotation speed data, the relative position and the characteristic value.
Specifically, the signal processing device 1 is configured to read data of the signal acquisition device 2, and process, analyze, and store the data. The signal acquisition equipment 2 is used for realizing the functions of level signal capturing, sampling, timer and signal transmission, reading signals of the rotating speed signal transceiving equipment 3 and the vibration signal transceiving equipment 6 and transmitting the signals to the signal processing equipment 1. The rotating speed signal transceiving equipment 3 is mounted on a rotating part of the engine 4, can rotate along with the engine, simultaneously generates a pulse signal, and sends the pulse signal to the signal acquisition equipment 2. When the engine 4 works, the internal piston can do up-and-down reciprocating motion and is converted into rotary motion through the connecting rod mechanism, vibration can be generated in the process, the vibration is transmitted to the automobile frame 7 through the suspension 5, and the vibration can be monitored by the vibration signal transceiving equipment 6 arranged at the joint of the suspension 5 and the automobile frame 7. The vibration signal transceiving equipment 6 sends the monitored vibration signal to the signal acquisition equipment 2.
During the operation of the engine 4, the rotation speed signal transceiving device 3 rotates together with the engine and generates a pulse signal, and the pulse signal is received by the signal acquisition device 2. The vibration of the engine 4 is transmitted to the vibration signal transceiving device 6 through the suspension 5, and the vibration signal transceiving device 6 converts the vibration signal into an electrical signal, which is received by the signal acquisition device 2.
The pulse signals of the rotating speed signal transceiving equipment 3 and the electric signals of the vibration signal transceiving equipment 6 are finally transmitted to the signal processing equipment 1 through the signal acquisition equipment 2, and the rotating speed and the relative position of the engine 4 are calculated by using the pulse signals of the rotating speed signal transceiving equipment 3 to serve as independent variables required by model building. Meanwhile, the vibration quantity is calculated in real time by using the electric signals of the vibration signal transceiving equipment 6, and the characteristic value of the vibration quantity is extracted to be used as a dependent variable required by the construction of the model.
The feature values of the rotation speed, the relative position, and the vibration amount at the same time are mapped in the signal processing device 1, and the vibration model is finally obtained.
Fig. 3 shows a schematic diagram of a tachometer signal transceiver apparatus according to an embodiment of the present invention.
During the operation of the engine 4, the rotating speed signal transceiving device 3 rotates along with the engine 4, the rotating part of the rotating speed signal transceiving device 3 rotates along with the engine 4, and the measuring part measures the rotating part in real time.
And a mark module is arranged at the rotating part of the rotating speed signal transceiving equipment 3, the rising edge signal of the output voltage of the mark module is recorded, and the relative position is obtained through calculation of the rising edge signal. In one embodiment, the flag module is absent from one of the rotating portions. When the missing part of the rotating part rotates to the range of the measuring part, the measuring part reads the signals of the falling edge and the rising edge at the missing part and sends out the signals of the rising edge.
It should be noted that the present invention uses a rotational speed signal transceiver with only one missing part of the rotating part, and may also use a rotational speed signal transceiver with more than one missing part of the rotating part. In addition, the absence on the device may be changed to a bump, and so on. The invention does not limit the structure of the mark module, and other mark module structures capable of measuring relative positions can be applied to the invention.
In an embodiment the rising edge signal is finally read by the signal processing device 1, when a variable t is used in the signal processing device 1 1 The current real time is recorded and a variable phase =0 representing the relative rising edge position is initialized. The signal from the vibration signal transmission and reception device 6 is read at a fixed reception frequency with a variable acc in the signal processing device 1, while the number of the read acc is counted with a variable count, and the above data is stored.
After a revolution of the rotating part, the measuring part again reads the rising edge signal, using a variable t in the signal processing device 1 2 Record the current real time, when phase =2 π. Using t 2 -t 1 The time length delta t of one rotation can be obtained by using 2 pi/delta t 1 The angular velocity of the rotating part can be known and the rotational speed of the engine can be estimated using the angular velocity. According to t 1 To t 2 The number of times acc is read during this time count equally divides phase into the corresponding number of segments. Mapping the currently acquired acc, phase and speed can obtain the following table 1, taking the engine speed of 1000rpm as an example:
TABLE 1 acc, phase and speed mapping tables
| acc | acc(1000) (1) | acc(1000) (2) | ··· | acc(1000) (m) |
| |
0 | 2πm | ··· | 2π |
| speed | 1000 | 1000 | ··· | 1000 |
Analyzing the vibration signal by using the acc data in a fast Fourier transform mode to obtain a vibration characteristic value acccreq 1 、accfreq 2 、···、accfreq k The value of k is generally not greater than 6. At different rotational speeds, acccreq 1 、accfreq 2 、···、accfreq k The values of (a) are different. The final model can be expressed as:
therein, phai n And calculating a matched value in a fitting mode, finally comparing and analyzing the y value and the acc value in a fitting degree analysis mode, and considering that the accuracy of the vibration model meets the requirement when the fitting degree reaches a certain degree. acccreq lists the model parameters analyzed as shown in table 2 below, taking an engine speed of 1000rpm as an example:
TABLE 2 model parameter mapping Table
| accfreq | accfreq(1000) 1 | ··· | accfreq(1000) 6 |
| phai | phai(1000) 1 | ··· | phai(1000) 6 |
And substituting the parameters in the table 2 into the formula 1-1 to obtain the target model. The y value calculated by using the model is compared with the acc value of the original data, and a comparison graph of the y value and the acc value of the original data as shown in fig. 4 can be obtained by taking the engine speed as 1000rpm as an example.
As shown in FIG. 4, the y value substantially coincides with the acc value of the original data, R 2 =0.98. The vibration model obtained by the invention is basically close to the original vibration data.
In conclusion, the method and the system for identifying and establishing the engine vibration model can establish the vibration model transmitted to the suspension and the automobile frame on the premise of not carrying out structural modeling, mechanical modeling and suspension modeling on the engine; in addition, the model established according to the method can accurately reflect the vibration actually transmitted to the automobile frame by the engine, and can be more quickly and better applied to the active control research of the engine suspension vibration.
It is to be understood that the disclosed embodiments of this invention are not limited to the particular structures, process steps, or materials disclosed herein but are extended to equivalents thereof as would be understood by those ordinarily skilled in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method of identifying and modeling engine vibrations, the method comprising:
independent variable steps: processing the acquired rotating speed signal of the engine, and calculating to obtain rotating speed data and relative position of the engine to serve as independent variables required for constructing a vibration model;
dependent variable step: processing the acquired vibration signal of the engine, and extracting a characteristic value of a vibration quantity to be used as a dependent variable required for constructing the vibration model;
modeling: and constructing and obtaining the vibration model based on the rotating speed data, the relative position and the characteristic value.
2. A method of identifying a model of engine vibration as claimed in claim 1, further comprising the steps of:
and judging the state of the engine, and acquiring the rotating speed signal and the vibration signal when the transmitter is in the running state.
3. The method of identifying and modeling engine vibrations of claim 1, wherein said independent variables step includes the steps of:
and setting a mark module on a rotating part of the rotating speed signal transceiving equipment, recording a rising edge signal of the output voltage of the mark module, and calculating the relative position according to the rising edge signal.
4. A method for identifying and modeling engine vibrations as claimed in claim 3, wherein said independent variables step includes the steps of:
and when the mark module rotates to the range of the measuring part of the rotating speed signal transceiving equipment, the measuring part reads the rising edge signal.
5. The method of identifying and modeling engine vibrations of claim 1, wherein said dependent variable step comprises the steps of:
and reading the vibration signal at a fixed receiving frequency, representing by acc, and analyzing by a preset processing method to obtain the characteristic value.
6. The method of identifying and modeling engine vibrations as set forth in claim 5, wherein said predetermined processing methods include, but are not limited to: fourier transform, wavelet transform, band pass filtering.
7. The method of identifying and modeling engine vibrations of claim 1, wherein said vibration model is expressed by:
wherein y represents the calculated vibration value, acccreq represents the characteristic value, phase represents the relative position, phase i represents the relative position n Representing the parameter to be determined, speed representing the rotational speed.
8. The method of identifying and modeling engine vibrations of claim 7, wherein said modeling step includes the steps of:
and comparing and analyzing the y (speed) value and the vibration signal acc of the engine by adopting a fitting degree analysis mode, and determining that the accuracy of the vibration model meets the requirement when the fitting degree reaches above a preset value.
9. A storage medium characterized in that it contains a series of instructions for carrying out the steps of the method according to any one of claims 1 to 8.
10. A system for identifying a model of engine vibration, the system being identified by a method according to any one of claims 1 to 8, the system comprising:
an engine for a vehicle, the engine having a motor,
the rotating speed signal transceiving equipment is used for acquiring a rotating speed signal of the engine;
the vibration signal transceiving equipment is used for acquiring a vibration signal of the engine;
the signal acquisition equipment is used for transmitting the rotating speed signal transmitted by the rotating speed signal transceiving equipment and the vibration signal transmitted by the vibration signal transceiving equipment;
a signal processing device configured to:
processing the acquired rotating speed signal of the engine, and calculating to obtain rotating speed data and relative position of the engine to serve as independent variables required for constructing a vibration model;
processing the acquired vibration signal of the engine, and extracting a characteristic value of a vibration quantity to be used as a dependent variable required for constructing the vibration model;
and constructing the vibration model based on the rotation speed data, the relative position and the characteristic value.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0872561A (en) * | 1994-09-01 | 1996-03-19 | Nippondenso Co Ltd | Electronically controlled engine mount |
| EP3241987A1 (en) * | 2016-03-04 | 2017-11-08 | Rolls-Royce plc | Rotor balancing |
| CN108327506A (en) * | 2017-01-20 | 2018-07-27 | 比亚迪股份有限公司 | Automobile and its active engine mount control system |
| CN113954617A (en) * | 2021-11-15 | 2022-01-21 | 株洲时代新材料科技股份有限公司 | Model-based feedforward and feedback combined automobile engine vibration active control method |
| CN115906293A (en) * | 2023-01-09 | 2023-04-04 | 一汽解放青岛汽车有限公司 | Rigidity curve design method and device for power assembly suspension system |
-
2021
- 2021-06-23 CN CN202110696409.1A patent/CN115509124A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0872561A (en) * | 1994-09-01 | 1996-03-19 | Nippondenso Co Ltd | Electronically controlled engine mount |
| EP3241987A1 (en) * | 2016-03-04 | 2017-11-08 | Rolls-Royce plc | Rotor balancing |
| CN108327506A (en) * | 2017-01-20 | 2018-07-27 | 比亚迪股份有限公司 | Automobile and its active engine mount control system |
| CN113954617A (en) * | 2021-11-15 | 2022-01-21 | 株洲时代新材料科技股份有限公司 | Model-based feedforward and feedback combined automobile engine vibration active control method |
| CN115906293A (en) * | 2023-01-09 | 2023-04-04 | 一汽解放青岛汽车有限公司 | Rigidity curve design method and device for power assembly suspension system |
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