CN116736107B - Electric automobile torque pulsation test method - Google Patents
Electric automobile torque pulsation test method Download PDFInfo
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- CN116736107B CN116736107B CN202310508887.4A CN202310508887A CN116736107B CN 116736107 B CN116736107 B CN 116736107B CN 202310508887 A CN202310508887 A CN 202310508887A CN 116736107 B CN116736107 B CN 116736107B
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- 230000010349 pulsation Effects 0.000 title claims abstract description 34
- 238000010998 test method Methods 0.000 title description 2
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 19
- 238000007405 data analysis Methods 0.000 claims abstract description 7
- 238000004364 calculation method Methods 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
Classifications
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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
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a method for testing torque pulsation of an electric automobile, which comprises the following steps of S1, preparing test equipment; s2, installing a sensor; s3, connecting equipment; s4, starting a test program; s5, starting a motor; s6, measuring data; s7, data analysis; s8, reporting results. According to the invention, the sensor is arranged at the shaft end of the motor to detect the rotating speed, the maximum torque value, the minimum torque value, the torque generated by the motor and the passing current generated by the motor in the motion process, so that the actual torque pulsation magnitude and the torque pulsation peak value are further obtained; and installing a load object at the shaft end of the motor, recording the mass of the load object and the distance from the load object to the rotating shaft center, and storing data into a computer to obtain the data difference generated in the processes of no-load and load with different masses.
Description
Technical Field
The invention relates to the technical field of automobile torque pulsation testing, in particular to an electric automobile torque pulsation testing method.
Background
Motor torque ripple refers to the periodic variation of torque during motor operation due to internal motor factors such as induced electromotive force ripple, power supply quality, controller accuracy, etc. Such periodic variations can lead to motor vibration and noise generation that adversely affects the operational stability and life of the motor. Motor torque ripple typically manifests as a periodic variation in output torque and becomes more pronounced as rotational speed increases. Torque ripple is mainly derived from various imbalance factors inside the engine or drive system, such as: misfire, valve jitter, crankshaft misalignment, piston vibration, gear inaccuracy, clutch slip, etc. These factors may cause fluctuations in engine output torque, thereby causing vibration and noise in the entire transmission system. For mechanical devices, torque ripple can have an impact on its life and reliability, and may even lead to failure. Therefore, in designing and using the machine, the influence of torque pulsation should be avoided or reduced as much as possible, and measures such as optimizing design, improving processing, enhancing vibration control, and the like should be taken.
At present, torque pulsation of an electric automobile is an important cause for automobile shake, and a common detection method is to calculate the magnitude of the torque pulsation through a theoretical formula by detecting distortion of a current waveform. However, the difference between the measurement result of the method and the actual generated torque is large, and the influence of the torque pulsation cannot be accurately reflected.
Disclosure of Invention
The invention aims to provide a method for testing torque pulsation of an electric automobile, which solves the problem that the torque pulsation of the electric automobile is an important cause for automobile shake, and the general detection method is to calculate the magnitude of the torque pulsation through a theoretical formula by detecting the distortion of a current waveform. However, the method has large difference between the measurement result and the actual generation, and can not accurately reflect the influence problem of torque pulsation, thereby meeting the actual use requirement.
In order to achieve the above purpose, the present invention provides the following technical solutions: the method for testing the torque pulsation of the electric automobile comprises the following steps: s1, preparing test equipment: the electric automobile motor to be tested is provided with a torque sensor, a rotating speed sensor and a data acquisition card which are used for measurement;
s2, installing a torque sensor and a rotation speed sensor: the method comprises the steps that a torque sensor and a rotating speed sensor are mounted on a motor shaft to be tested and are tightly connected, and the mounting positions and the mounting directions of the torque sensor and the rotating speed sensor are consistent with the rotating direction of the motor;
s3, connecting equipment: connecting a torque sensor and a rotating speed sensor with a data acquisition card and a computer, and installing a load object on a motor to be tested;
s4, starting a test program: starting a torque ripple test program, and performing initialization setting, including sampling rate, sampling time and path parameter preservation;
s5, starting a motor: starting the motor to normally run, and recording data after the rotation speed of the motor is stable;
s6, measuring data: acquiring torque data in the running process of a motor, wherein the data comprise rotating speed, maximum torque value, minimum torque value, mass of a load object, distance from the load object to a rotating shaft center, torque generated by the motor and passing current, and storing the data into a computer;
s7, data analysis: processing and analyzing the acquired data to obtain the relation among torque pulsation, torque coefficient, load inertia, torque pulsation peak value, torque pulsation and motor vibration, and carrying out statistics and evaluation;
s8, reporting the result: a test report is generated based on the data analysis results, including a torque ripple graph and associated indicators of torque ripple averages, standard deviations, maxima, and minima.
As a preferred embodiment of the present invention, the torque ripple Δt is calculated as follows:
wherein K is T Is a torque coefficient, T nom For rated torque, Δj is the amount of change in load inertia, and J is load inertia.
As a preferred embodiment of the present invention, the torque coefficient K T The calculation formula of (2) is as follows:
K T ＝T/I，
wherein T is torque generated by a motor, and the unit is cow meter (N.m); i is the current through the motor in amperes (A).
As a preferred embodiment of the present invention, the torque ripple peak-to-peak value T P-P The calculation formula of (2) is as follows:
wherein T is max Represents the maximum torque value, T min Representing a minimum torque value.
As a preferred embodiment of the present invention, the calculation formula of the load inertia J is as follows:
J＝(1/2)×m×r^2，
wherein m is the mass of the load object in kilograms (kg); r is the distance from the load object to the rotation axis, and the unit is meter (m).
As a preferred embodiment of the present invention, the calculation formula of the motor vibration a is as follows:
where Δt is a torque ripple value, J is a load inertia, and w is a rotation speed.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the sensor is arranged at the shaft end of the motor to detect the rotating speed, the maximum torque value, the minimum torque value, the torque generated by the motor and the passing current generated by the motor in the motion process, so that the actual torque pulsation magnitude and the torque pulsation peak value are further obtained; and installing a load object at the shaft end of the motor, recording the mass of the load object and the distance from the load object to the rotating shaft center, and storing data into a computer to obtain the data difference generated in the processes of no-load and load with different masses.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a technical scheme that: the method for testing the torque pulsation of the electric automobile comprises the following steps: s1, preparing test equipment: the electric automobile motor to be tested is provided with a torque sensor, a rotating speed sensor and a data acquisition card which are used for measurement;
s2, installing a torque sensor and a rotation speed sensor: the method comprises the steps that a torque sensor and a rotating speed sensor are mounted on a motor shaft to be tested and are tightly connected, and the mounting positions and the mounting directions of the torque sensor and the rotating speed sensor are consistent with the rotating direction of the motor;
s3, connecting equipment: connecting a torque sensor and a rotating speed sensor with a data acquisition card and a computer, and installing a load object on a motor to be tested;
s4, starting a test program: starting a torque ripple test program, and performing initialization setting, including sampling rate, sampling time and path parameter preservation;
s5, starting a motor: starting the motor to normally run, and recording data after the rotation speed of the motor is stable;
s6, measuring data: acquiring torque data in the running process of a motor, wherein the data comprise a rotating speed, a maximum torque value, a minimum torque value, the mass of a load object and the distance from the load object to a rotating shaft center, calculating the size of the load object, the relation between motor vibration and torque pulsation, the moment generated by the motor and the passing current by adding the load objects with different masses, and storing the data into a computer;
s7, data analysis: processing and analyzing the acquired data to obtain the relation among torque pulsation, torque coefficient, load inertia, torque pulsation peak value, torque pulsation and motor vibration, and carrying out statistics and evaluation;
s8, reporting the result: a test report is generated based on the data analysis results, including a torque ripple graph and associated indicators of torque ripple averages, standard deviations, maxima, and minima.
Further improved, the torque ripple Δt is calculated as follows:
wherein K is T Is a torque coefficient, T nom For rated torque, Δj is the amount of change in load inertia, and J is load inertia.
Further improved, the torque coefficient K T The calculation formula of (2) is as follows:
K T ＝T/I，
wherein T is torque generated by a motor, and the unit is cow meter (N.m); i is the current through the motor in amperes (A).
The torque and current in the above formula generally refer to the values of the motor under certain operating conditions. Therefore, in performing torque coefficient calculations, it is necessary to determine the required torque and current values based on specific operating parameters.
Further improved, torque ripple peak-to-peak value T P-P The calculation formula of (2) is as follows:
wherein T is max Represents the maximum torque value, T min Representing a minimum torque value.
Further improved, the load inertia J is calculated as follows:
J＝(1/2)×m×r^2，
wherein m is the mass of the load object in kilograms (kg); r is the distance from the load object to the rotation axis, and the unit is meter (m).
The load object in the above formula may be of various shapes and sizes, and thus the specific calculation method may be different. The load inertia of the motor will typically also include the inertia of the drive train and other additional components, which will need to be accounted for in the calculation.
Further improved, the calculation formula of the motor vibration a is as follows:
where Δt is a torque ripple value, J is a load inertia, and w is a rotation speed.
And obtaining the relation between the motor vibration a and the torque pulsation value delta T, and calculating the relation between the load size and the motor vibration a and the torque pulsation value delta T by adding loads with different masses.
The motor shaft end is provided with a sensor to detect the rotating speed, the maximum torque value, the minimum torque value, the torque generated by the motor and the passing current generated by the motor in the motion process, so as to further obtain the actual torque pulsation magnitude and the torque pulsation peak value; and installing a load object at the shaft end of the motor, recording the mass of the load object and the distance from the load object to the rotating shaft center, and storing data into a computer to obtain the data difference generated in the processes of no-load and load with different masses.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The method for testing the torque pulsation of the electric automobile is characterized by comprising the following steps of:
s1, preparing test equipment: the electric automobile motor to be tested is provided with a torque sensor, a rotating speed sensor and a data acquisition card which are used for measurement;
s2, installing a torque sensor and a rotation speed sensor: the method comprises the steps that a torque sensor and a rotating speed sensor are mounted on a motor shaft to be tested and are tightly connected, and the mounting positions and the mounting directions of the torque sensor and the rotating speed sensor are consistent with the rotating direction of the motor;
s3, connecting equipment: connecting a torque sensor and a rotating speed sensor with a data acquisition card and a computer, and installing a load object on a motor to be tested;
s4, starting a test program: starting a torque ripple test program, and performing initialization setting, including sampling rate, sampling time and path parameter preservation;
s5, starting a motor: starting the motor to normally run, and recording data after the rotation speed of the motor is stable;
s6, measuring data: acquiring torque data in the running process of a motor, wherein the data comprise rotating speed, maximum torque value, minimum torque value, mass of a load object, distance from the load object to a rotating shaft center, torque generated by the motor and passing current, and storing the data into a computer;
s7, data analysis: processing and analyzing the acquired data to obtain the relation among torque pulsation, torque coefficient, load inertia, torque pulsation peak value, torque pulsation and motor vibration, and carrying out statistics and evaluation;
s8, reporting the result: a test report is generated based on the data analysis results, including a torque ripple graph and associated indicators of torque ripple averages, standard deviations, maxima, and minima.
2. The method for testing torque ripple of an electric vehicle according to claim 1, wherein: the torque ripple Δt is calculated as follows:
wherein K is T Is a torque coefficient, T nom For rated torque, Δj is the amount of change in load inertia, and J is load inertia.
3. The method for testing torque ripple of an electric vehicle according to claim 1, wherein: torque coefficient K T The calculation formula of (2) is as follows:
K T ＝T/I，
wherein T is torque generated by a motor, and the unit is cow meter (N.m); i is the current through the motor in amperes (A).
4. The method for testing torque ripple of an electric vehicle according to claim 1, wherein: peak-to-peak value T of torque ripple P-P The calculation formula of (2) is as follows:
wherein T is max Represents the maximum torque value, T min Representing a minimum torque value.
5. The method for testing torque ripple of an electric vehicle according to claim 1, wherein: the calculation formula of the load inertia J is as follows:
J＝(1/2)×m×r^2，
wherein m is the mass of the load object in kilograms (kg); r is the distance from the load object to the rotation axis, and the unit is meter (m).
6. The method for testing torque ripple of an electric vehicle according to claim 1, wherein: the calculation formula of the motor vibration a is as follows:
where Δt is a torque ripple value, J is a load inertia, and w is a rotation speed.
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| CN202310508887.4A CN116736107B (en) | 2023-05-08 | 2023-05-08 | Electric automobile torque pulsation test method |
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