CN107884712B - Method and device for determining fluctuation curve of motor input current - Google Patents
Method and device for determining fluctuation curve of motor input current Download PDFInfo
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- CN107884712B CN107884712B CN201711021730.XA CN201711021730A CN107884712B CN 107884712 B CN107884712 B CN 107884712B CN 201711021730 A CN201711021730 A CN 201711021730A CN 107884712 B CN107884712 B CN 107884712B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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Abstract
The invention discloses a method and a device for determining a fluctuation curve of motor input current, wherein the method overcomes the defects that the traditional current analysis method is difficult to quantify the current fluctuation degree and find and judge the working condition corresponding to the current fluctuation, not only can obtain more accurate current fluctuation, but also can accurately identify the working condition corresponding to the current fluctuation.
Description
Technical Field
The invention relates to the technical field of vehicle control, in particular to a method and a device for determining a fluctuation curve of motor input current.
Background
The fluctuation of the input current of the motor of the vehicle driving motor can directly cause the fluctuation of the output torque of the vehicle driving motor, thereby causing the increase of energy consumption, causing the shaking of the whole vehicle and influencing the riding comfort.
A general motor input current analysis method is briefly described herein. Referring to fig. 1, a curve 0 in fig. 1 is an output torque variation curve of the motor, a curve 1 is a real-time variation curve of an input current of the motor, and a curve 3 is an effective value curve of the input current of the motor. In the conventional motor input current analysis method, the fluctuation of the current is evaluated by curve 1, and whether the output torque of the motor has obvious fluctuation is evaluated by curve 3. However, as can be seen from fig. 1, when the effective value of the input current of the motor has no significant fluctuation, the output torque of the motor also has significant fluctuation; the fluctuation condition of the input current of the motor cannot be accurately evaluated through the real-time change curve 1. Therefore, how to better evaluate the input current of the motor becomes a technical problem to be solved urgently.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present application is to provide a method for determining a fluctuation amount curve of an input current of a motor, which overcomes the defects that the current fluctuation degree is difficult to quantify and the working condition corresponding to the current fluctuation is difficult to find and determine in the conventional current analysis method, and can obtain a more accurate current fluctuation amount and accurately identify the working condition corresponding to the current fluctuation.
A second object of the present application is to provide a device for determining a fluctuation amount curve of an input current of an electric motor.
In order to achieve the above object, an embodiment of a first aspect of the present application provides a method for determining a fluctuation amount curve of an input current of a motor, including:
acquiring a real-time curve of corresponding motor input current when the vehicle driving motor operates;
acquiring an outer envelope curve of the input current of the motor according to the real-time curve;
acquiring an effective value curve of the corresponding motor input current when the vehicle driving motor operates;
and acquiring a fluctuation curve of the input current of the motor according to the outer envelope curve and the effective value curve.
The method for obtaining the fluctuation curve of the input current of the motor according to the outer envelope curve and the effective value curve comprises the following steps:
obtaining an effective value curve corresponding to the outer envelope curve;
and subtracting the effective value curve corresponding to the outer envelope curve from the effective value curve of the input current of the motor to obtain a fluctuation amount curve of the input current of the motor.
The method as described above, after obtaining the fluctuation amount curve of the motor input current according to the outer envelope curve and the effective value curve of the motor input current, further comprising:
determining a section with large fluctuation amount in the fluctuation amount curve;
and determining the working condition corresponding to the section with the large fluctuation amount according to the time period corresponding to the section with the large fluctuation amount.
The method for obtaining the outer envelope curve of the input current of the motor according to the real-time curve comprises the following steps:
and performing Hilbert transformation on the real-time curve to obtain an outer envelope curve of the input current of the motor.
The method for acquiring the effective value curve of the motor input current corresponding to the running of the vehicle driving motor comprises the following steps:
and extracting an effective value curve of the corresponding motor input current when the vehicle driving motor operates from the CAN bus.
In order to achieve the above object, a second embodiment of the present application provides a device for determining a fluctuation curve of an input current of a motor, including:
the system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring a real-time curve of corresponding motor input current when a vehicle driving motor operates;
the second acquisition module is used for acquiring an outer envelope curve of the input current of the motor according to the real-time curve;
the third acquisition module is used for acquiring an effective value curve of the corresponding motor input current when the vehicle driving motor operates;
and the first determining module is used for acquiring a fluctuation curve of the input current of the motor according to the outer envelope curve and the effective value curve.
In the above apparatus, the first determining module is specifically configured to: obtaining an effective value curve corresponding to the outer envelope curve; and subtracting the effective value curve corresponding to the outer envelope curve from the effective value curve of the input current of the motor to obtain a fluctuation amount curve of the input current of the motor.
The apparatus as described above, further comprising:
the second determination module is used for determining a section with large fluctuation quantity in the fluctuation quantity curve after the first determination module obtains the fluctuation quantity curve of the motor input current according to the outer envelope curve and the effective value curve of the motor input current; and determining the working condition corresponding to the section with the large fluctuation amount according to the time period corresponding to the section with the large fluctuation amount.
In the above apparatus, the second obtaining module is specifically configured to: and performing Hilbert transformation on the real-time curve to obtain an outer envelope curve of the input current of the motor.
In the above apparatus, the third obtaining module is specifically configured to: and extracting an effective value curve of the corresponding motor input current when the vehicle driving motor operates from the CAN bus.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a graph of motor input current for an exemplary one;
fig. 2 is a flowchart of a method for determining a fluctuation amount curve of an input current of a motor according to an embodiment of the present invention;
FIG. 3 is a graph of motor input current for exemplary two;
FIG. 4 is a graph of motor input current for an exemplary three;
FIG. 5 is a graph of motor input current for an exemplary four;
FIG. 6 is a graph of motor input current for an exemplary five;
fig. 7 is a flowchart of a method for determining a fluctuation amount curve of an input current of a motor according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram of a device for determining a fluctuation amount curve of an input current of a motor according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
Fig. 2 is a flowchart of a method for determining a fluctuation curve of a motor input current according to an embodiment of the present invention, where an execution subject of the method for determining a fluctuation curve of a motor input current according to the embodiment is a device for determining a fluctuation curve of a motor input current, the device may be composed of software and/or hardware, and the device may be integrated in an ECU (electronic control Unit) in a vehicle.
As shown in fig. 2, the method for determining a fluctuation curve of an input current of a motor according to this embodiment includes the following steps:
s101, acquiring a real-time curve of corresponding motor input current when the vehicle driving motor operates.
For example, when the driving motor for the vehicle runs, the current sensor and other acquisition devices acquire the input current of the motor in real time and output a real-time curve of the input current of the motor at the same time. The real-time curve in this embodiment can be understood as a time-domain waveform of the input current of the motor, that is, a variation relationship of the input current of the motor with time. Taking fig. 3 as an example, fig. 3 relates to two curves, wherein curve 1 is a real-time curve of the input current of the motor, curve 1 represents the variation of the input current value of the motor with time, and curve 2 is an outer envelope curve of curve 1.
And S102, acquiring an outer envelope curve of the input current of the motor according to the real-time curve.
Specifically, the outer envelope curve can reflect the change relation of the peak value of the real-time curve along with time, and further can be used for analyzing the fluctuation amount of the input current of the motor.
In a possible implementation manner, the specific implementation manner of step S102 is: "hilbert transform the real-time curve to obtain an outer envelope curve of the motor input current". The Hilbert transform is a more effective data processing method for envelope analysis, and the embodiment of the invention can obtain a more accurate outer envelope curve by using the Hilbert transform for envelope analysis, thereby being beneficial to better analyzing the fluctuation quantity of the input current of the motor in the follow-up process.
S103, acquiring an effective value curve of the motor input current corresponding to the running of the vehicle driving motor.
For example, the effective value curve may be obtained by calculating an effective value of the real-time curve, or may be extracted from the CAN bus as the effective value curve of the motor input current corresponding to the vehicle driving motor during operation. For example, the vehicle controller of the vehicle may monitor the state of the vehicle driving motor in real time, monitor the real-time change of the input current of the motor, and generate an effective value curve of the input current of the motor according to the real-time change of the input current of the motor. Therefore, the embodiment CAN rapidly extract the effective value curve of the corresponding motor input current when the vehicle driving motor operates through the CAN bus. Taking fig. 4 as an example, curve 3 is a curve of effective values of the input current of the motor.
And S104, acquiring a fluctuation amount curve of the input current of the motor according to the outer envelope curve and the effective value curve of the input current of the motor.
In a possible implementation manner, the specific implementation manner of step S104 is: obtaining an effective value curve corresponding to the outer envelope curve; and subtracting the effective value curve corresponding to the outer envelope curve from the effective value curve of the motor input current to obtain a fluctuation amount curve of the motor input current.
Specifically, fig. 5 relates to 2 curves, where curve 4 is the effective value curve corresponding to the outer envelope curve, and curve 3 is the effective value curve. Curve 5 in fig. 6 is a fluctuation amount curve. As can be seen from fig. 6, the obtained fluctuation amount curve is not a smooth curve as the curve 3, but a curve with a relatively obvious fluctuation range, and a section with a large fluctuation amount can be obviously obtained by using the fluctuation amount curve, so that the subsequent identification of the working condition with a large fluctuation amount is facilitated.
In the present embodiment, the relation between the finite value and the peak value, that is, the effective value is used as the peak value
So only curve 2, i.e. the outer envelope curve, needs to be multiplied by
And converting the effective value curve into an effective value curve corresponding to the outer envelope curve, namely curve 4, so that the effective value curve corresponding to the outer envelope curve can be obtained simply and conveniently.
Note that in fig. 1 and fig. 3 to 6, the horizontal axis corresponds to time, and the vertical axis corresponds to amplitude.
In this embodiment, the effective value curve corresponding to the outer envelope curve is obtained by calculating an effective value of an envelope signal of the input current of the motor, which can be understood to be obtained by calculating a peak signal of the input current of the motor to a certain extent, and the effective value curve of the input current of the motor is obtained by calculating an effective value of a time-domain signal of the input current of the motor. Then, to a certain extent, the difference between the effective value curve corresponding to the outer envelope curve and the effective value curve of the motor input current can be understood as the fluctuation amount of the motor input current. Therefore, in this embodiment, the effective value curve corresponding to the outer envelope curve is subtracted from the effective value curve of the input current of the motor to obtain the fluctuation amount curve of the input current of the motor.
In the method for determining the fluctuation curve of the input current of the motor provided by the embodiment, the real-time curve of the input current of the motor corresponding to the running of the vehicle driving motor is obtained; acquiring an outer envelope curve of the input current of the motor according to the real-time curve; acquiring an effective value curve of the corresponding motor input current when the vehicle driving motor operates; and acquiring a fluctuation curve of the input current of the motor according to the outer envelope curve and the effective value curve. Compared with a conventional motor input current analysis method, the method only utilizes the real-time change curve and the effective value of the motor input current to evaluate the fluctuation condition of the motor input current, and the embodiment utilizes the outer envelope curve and the effective value curve of the motor input current to evaluate the fluctuation condition of the motor input current, so that the fluctuation amount of the current can be evaluated more accurately.
Fig. 7 is a flowchart of a method for determining a fluctuation amount curve of an input current of a motor according to another embodiment of the present invention.
As shown in fig. 7, the method for determining a fluctuation curve of an input current of a motor according to this embodiment includes the following steps:
s201, acquiring a real-time curve of corresponding motor input current when the vehicle driving motor operates.
S202, acquiring an outer envelope curve of the input current of the motor according to the real-time curve.
S203, acquiring an effective value curve of the motor input current corresponding to the running of the vehicle driving motor.
And S204, acquiring a fluctuation curve of the input current of the motor according to the outer envelope curve and the effective value curve.
The implementation manners of steps S201, S202, S203, and S204 in this embodiment are the same as the implementation manners of steps S201, S202, S203, and S204 in the above embodiment, and are not described again here.
S205, determining a section with large fluctuation amount in the fluctuation amount curve.
S206, determining the working condition corresponding to the section with the large fluctuation amount according to the time period corresponding to the section with the large fluctuation amount.
For example, by observing the fluctuation amount curve, i.e., curve 5 in fig. 6, a section with a relatively large fluctuation amount of the curve 5 can be determined, and according to the time period corresponding to the section, the operating condition corresponding to the section can be easily determined. For example, the fluctuation amount of the input current of the motor is relatively large when the vehicle is started at a low speed or braked at a low speed, and accordingly, the output torque of the motor also fluctuates obviously, and at this time, in the fluctuation amount curve, the section corresponding to the low-speed starting or the low-speed braking also fluctuates obviously, so that the fluctuation condition of each working condition of the vehicle can be known according to the fluctuation amount curve.
According to the method for determining the fluctuation curve of the input current of the motor, the conditions of various working conditions of a vehicle can be known according to the fluctuation conditions of the fluctuation curve, and the corresponding working conditions when the current fluctuation is large can be conveniently identified.
Fig. 8 is a schematic structural diagram of a device for determining a fluctuation amount curve of an input current of a motor according to an embodiment of the present invention.
As shown in fig. 8, the apparatus for determining a fluctuation amount curve of an input current of a motor according to this embodiment includes:
the first acquisition module 11 is used for acquiring a real-time curve of corresponding motor input current when the vehicle driving motor operates;
the second obtaining module 12 is configured to obtain an outer envelope curve of the input current of the motor according to the real-time curve;
the third obtaining module 13 is configured to obtain an effective value curve of the corresponding motor input current when the vehicle driving motor operates;
and the first determining module 14 is used for acquiring a fluctuation curve of the motor input current according to the outer envelope curve and the effective value curve of the motor input current.
Further, the first determining module 14 is specifically configured to: obtaining an effective value curve corresponding to the outer envelope curve; and subtracting the effective value curve corresponding to the outer envelope curve from the effective value curve of the input current of the motor to obtain a fluctuation amount curve of the input current of the motor.
Further, the apparatus further comprises:
the second determination module is used for determining a section with large fluctuation quantity in the fluctuation quantity curve after the first determination module obtains the fluctuation quantity curve of the motor input current according to the outer envelope curve and the effective value curve of the motor input current; and determining the working condition corresponding to the section with the large fluctuation amount according to the time period corresponding to the section with the large fluctuation amount.
Further, the second obtaining module 12 is specifically configured to: and performing Hilbert transformation on the real-time curve to obtain an outer envelope curve of the input current of the motor.
Further, the third obtaining module 13 is specifically configured to: and extracting an effective value curve of the corresponding motor input current when the vehicle driving motor operates from the CAN bus.
The specific manner in which the respective modules perform operations has been described in detail in relation to the apparatus in this embodiment, and will not be elaborated upon here.
The device for determining the fluctuation curve of the motor input current provided by the embodiment acquires the corresponding real-time curve of the motor input current when the vehicle driving motor operates; acquiring an outer envelope curve of the input current of the motor according to the real-time curve; acquiring an effective value curve of the corresponding motor input current when the vehicle driving motor operates; and acquiring a fluctuation curve of the input current of the motor according to the outer envelope curve and the effective value curve. Compared with a conventional motor input current analysis device, the motor input current fluctuation condition is evaluated only by using the real-time change curve and the effective value of the motor input current, the motor input current fluctuation condition is evaluated by using the outer envelope curve and the effective value curve of the motor input current, and the more accurate evaluation of the current fluctuation can be realized.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by suitable instruction execution devices. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one first processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (8)
1. A method for determining a fluctuation amount curve of an input current of a motor, comprising:
acquiring a real-time curve of corresponding motor input current when the vehicle driving motor operates;
acquiring an outer envelope curve of the input current of the motor according to the real-time curve;
acquiring an effective value curve of the corresponding motor input current when the vehicle driving motor operates;
acquiring a fluctuation amount curve of the input current of the motor according to the outer envelope curve and the effective value curve;
the obtaining of the fluctuation curve of the motor input current according to the outer envelope curve and the effective value curve of the motor input current includes:
obtaining an effective value curve corresponding to the outer envelope curve;
and subtracting the effective value curve corresponding to the outer envelope curve from the effective value curve of the input current of the motor to obtain a fluctuation amount curve of the input current of the motor.
2. The method of claim 1, further comprising, after said obtaining a curve of an amount of fluctuation of the motor input current from the outer envelope curve and the curve of the effective value of the motor input current:
determining a section with large fluctuation amount in the fluctuation amount curve;
and determining the working condition corresponding to the section with the large fluctuation amount according to the time period corresponding to the section with the large fluctuation amount.
3. The method of claim 1, wherein said obtaining an outer envelope curve of the motor input current from the real-time curve comprises:
and performing Hilbert transformation on the real-time curve to obtain an outer envelope curve of the input current of the motor.
4. The method of any one of claims 1 to 3, wherein the obtaining of the curve of the effective values of the input current of the motor corresponding to the operation of the driving motor for the vehicle comprises:
and extracting an effective value curve of the corresponding motor input current when the vehicle driving motor operates from the CAN bus.
5. An apparatus for determining a fluctuation amount profile of an input current to a motor, comprising:
the system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring a real-time curve of corresponding motor input current when a vehicle driving motor operates;
the second acquisition module is used for acquiring an outer envelope curve of the input current of the motor according to the real-time curve;
the third acquisition module is used for acquiring an effective value curve of the corresponding motor input current when the vehicle driving motor operates;
a first determining module, configured to obtain a fluctuation amount curve of the motor input current according to the outer envelope curve and the effective value curve of the motor input current, where the first determining module is specifically configured to: obtaining an effective value curve corresponding to the outer envelope curve; and subtracting the effective value curve corresponding to the outer envelope curve from the effective value curve of the input current of the motor to obtain a fluctuation amount curve of the input current of the motor.
6. The apparatus of claim 5, further comprising:
the second determination module is used for determining a section with large fluctuation quantity in the fluctuation quantity curve after the first determination module obtains the fluctuation quantity curve of the motor input current according to the outer envelope curve and the effective value curve of the motor input current; and determining the working condition corresponding to the section with the large fluctuation amount according to the time period corresponding to the section with the large fluctuation amount.
7. The apparatus of claim 5, wherein the second obtaining module is specifically configured to: and performing Hilbert transformation on the real-time curve to obtain an outer envelope curve of the input current of the motor.
8. The apparatus according to any one of claims 5 to 7, wherein the third obtaining module is specifically configured to: and extracting an effective value curve of the corresponding motor input current when the vehicle driving motor operates from the CAN bus.
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| CN105372479B (en) * | 2015-11-11 | 2017-12-22 | 广东电网有限责任公司梅州供电局 | A kind of voltage flicker measuring method of quality of power supply measuring instrument |
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| CN102713554A (en) * | 2010-01-04 | 2012-10-03 | Ntn株式会社 | Abnormality diagnosis device for rolling bearing, wind power generator, and abnormality diagnosis system |
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