CN113064066B - Method and system for testing zero torque of electric automobile motor - Google Patents
Method and system for testing zero torque of electric automobile motor Download PDFInfo
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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
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- 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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Abstract
The invention relates to a method and a system for testing zero torque of an electric automobile motor, wherein the method comprises the steps of obtaining a function curve of real-time speed and time from preset speed to zero speed when the electric automobile motor to be tested slides, firstly obtaining a resistance moment T1 of a dynamometer of a motor torque testing platform, then obtaining a torque T2 of a dynamometer of a motor load motor torque testing platform of the electric automobile to be tested, subtracting the T1 from the T2 to obtain a zero torque value T of the electric motor of the electric automobile to be tested, and providing a reference of actual zero torque value data for correction of a sliding resistance curve of the electric automobile to be tested. Therefore, the fact that a certain resistance exists in the dynamometer is eliminated, actual test data are provided for correction of the sliding resistance curve, and the accuracy of testing zero torque of the motor is improved.
Description
Technical Field
The invention relates to the technical field of electric automobile production, in particular to a zero torque testing system for an electric automobile motor.
Background
The development of the electric automobile industry is rapid, and compared with the traditional passenger car, the power assembly part of the electric automobile is changed into a motor and a speed reducer (pure electric) from the original combination of an engine and a gearbox. The main problem is that the power transmission structure of the motor and the speed reducer cannot be separated from the wheels, so that even if the electric automobile is in neutral gear sliding, the motor is in a zero torque mode, and certain resistance exists inevitably.
The most important index of the electric automobile is the driving range under the NEDC working condition, and when the whole automobile is advertised, the hub is required to load a sliding resistance curve to fit the actual driving resistance, and the resistance curve is usually used for sliding test activities. When the pure electric vehicle slides, the resistance of the motor cannot be completely zero due to the above-mentioned reasons, and the resistance has a normal distribution trend within a certain range due to the problem of production consistency of the motor. It is necessary to accurately measure the zero torque resistance of the motor to more accurately fit the resistance curve.
More information about the above solutions can also be found in the following documents:
in the invention patent with the Chinese patent publication number of CN112026534A, a pure electric vehicle torque safety control system and method are disclosed, wherein the system comprises a torque monitoring mechanism and a torque control mechanism; the torque monitoring mechanism comprises a first microcontroller, a first microcontroller power supply, a second microcontroller power supply and a CAN bus circuit; the first microcontroller and the second microcontroller are integrated with a torque control mechanism, and the torque control mechanism comprises a torque demand module, a torque arbitration module, a vehicle speed limiting module, a torque conversion module, a torque filtering module, a torque limiting module and a torque coordination module; the first microcontroller and the second microcontroller of the torque monitoring system are mutually isolated to prevent mutual interference, and when the first microcontroller fails, the second microcontroller quickly resets the first microcontroller, so that the first microcontroller quickly returns to normal, and meanwhile, the first microcontroller and the second microcontroller mutually verify to avoid out of control of torque control, thereby greatly enhancing the safety and reliability of the torque control system.
In the invention patent with the Chinese patent publication number of CN112146894A, a test method for no-load loss of an electric drive assembly based on the working condition of the whole vehicle is disclosed, which comprises the following steps: selecting a working mode of the electric drive assembly in a whole vehicle idle running state; building an electric drive assembly no-load loss test bench under the working mode; setting the operation condition of a rack, and carrying out no-load loss test; the method comprises the steps that the output rotating speed of an electric drive assembly is controlled by a dynamometer to simulate the actual running speeds of different electric vehicles, a rotating speed test point and the running time of each rotating speed working point are set, and after the output rotating speed and torque of the electric drive assembly of each measuring point are stable, test data are recorded; according to the test data, the idle load loss Ploss of the electric drive assembly of each measuring point is calculated in sequence, and a rotating speed-idle load loss curve of the electric drive assembly under the working mode is obtained through function fitting.
In the process of implementing the present invention, the inventor finds that the following problems exist in the prior art:
in the existing whole vehicle test, after the vehicle slides, the resistance curve can be used continuously, the follow-up sliding is not repeated, and the zero-torque drag resistance test of the motor is necessary. In the existing test method, torque interference of a dynamometer cannot be avoided during test; only zero torque drag resistance at a fixed speed is typically tested, while the actual slip is in a shift state under a slip deceleration curve.
Disclosure of Invention
Therefore, a method and a system for testing zero torque of an electric automobile motor are needed to be provided, and are used for solving the problem that torque interference of a dynamometer cannot be avoided in the prior art during testing; and usually only the technical problem of zero torque drag resistance at a fixed rotating speed is tested.
In order to achieve the above purpose, the inventor provides a method for testing zero torque of an electric vehicle motor, comprising the following steps:
constructing a motor torque testing platform;
obtaining a function curve of real-time vehicle speed and time used when an electric vehicle motor to be tested slides from a preset vehicle speed to a zero vehicle speed in a sliding state, converting the function curve of the real-time vehicle speed and the time used into a corresponding function curve of the motor rotating speed and the time, and setting the function curve as a first function curve;
according to the speed acceleration rate of the first function curve, the dynamometer of the torque testing platform of the testing motor is independently operated in a speed mode, the speed is accelerated from zero speed to a preset speed, the torque value of the dynamometer of the torque testing platform of the testing motor is measured, a function curve of torque change is obtained, and therefore the resistance moment T1 of the dynamometer of the torque testing platform of the motor is obtained for later use;
the motor of the electric automobile to be tested is in transmission connection with a dynamometer of a motor torque testing platform, the motor of the electric automobile to be tested runs under rated voltage, and the motor of the electric automobile to be tested runs under a zero torque state;
according to the speed acceleration rate of the first function curve, the dynamometer of the motor torque testing platform is operated in the speed mode, the speed is accelerated from zero speed to preset speed, the torque value of the dynamometer of the motor load motor torque testing platform of the electric automobile to be tested is measured, the function curve of torque change is obtained, and therefore the torque T2 of the dynamometer of the motor load motor torque testing platform of the electric automobile to be tested is obtained;
and subtracting T1 from T2 to obtain a zero torque value T of the motor of the electric vehicle to be tested, and providing a reference of actual zero torque value data for correction of the sliding resistance curve of the electric vehicle to be tested.
As one implementation mode of the invention, before the step of constructing the motor torque test platform, the method further comprises the step of analyzing the torque resistance of the motor and the test platform, and analyzing the mechanical friction resistance, the bearing resistance, the wind resistance, the cooling resistance and the electromagnetic resistance of the motor.
As one implementation mode of the invention, the motor torque testing platform is characterized in that the connection between the dynamometer and the tested motor is disconnected through the connection flange plate and the spline housing, and the torque of the dynamometer is tested, so that the test interference is eliminated.
As one embodiment of the invention, the connecting flange plate and the spline housing are connected again, sliding speed reduction is carried out according to preset settings, and the clutch box enables the engine to enter a zero torque output state.
As one implementation mode of the invention, the rear driving device is arranged to be connected with the dynamometer, the overrunning clutch box is arranged between the dynamometer and the engine to be tested, the rear driving device is used as power to adjust torque to drive the dynamometer and the engine to be tested to rotate in the rotating direction, so that the rotating speed of the output end of the overrunning clutch box is higher than the input rotating speed, the overrunning clutch is disengaged, and the engine to be tested is disengaged from the dynamometer, thereby realizing the zero torque test of the engine.
Compared with the prior art, the technical scheme is characterized in that the function curve of real-time speed and used time is measured by obtaining the speed of the electric vehicle to be tested and sliding from the preset speed to the zero speed in the sliding state, the resistance moment T1 of the dynamometer of the motor torque test platform is obtained firstly, then the torque T2 of the dynamometer of the motor load motor torque test platform of the electric vehicle to be tested is obtained, the zero torque value T of the motor of the actual electric vehicle to be tested is obtained by subtracting the T1 from the T2, and the reference of actual zero torque value data is provided for the correction of the sliding resistance curve of the electric vehicle to be tested. Therefore, the fact that a certain resistance exists in the dynamometer is eliminated, actual test data are provided for correction of the sliding resistance curve, and the accuracy of testing zero torque of the motor is improved.
In order to achieve the above object, the present inventors also provide a system for testing zero torque of an electric vehicle motor, which includes an execution unit, wherein the execution unit is configured to execute the method for testing zero torque of an electric vehicle motor provided by any one of the above-mentioned inventors.
As one embodiment of the invention, the testing system comprises a dynamometer, a first coupling, a connecting flange, a torque sensor and a second coupling, wherein the dynamometer is in transmission connection with the connecting flange through the first coupling, an engine to be tested is in transmission connection with the connecting flange through the second coupling, and the torque sensor is used for testing the torque of the connecting flange.
Compared with the prior art, the technical scheme provides actual test data for correcting the sliding resistance curve by eliminating certain resistance existing in the dynamometer, and improves the accuracy of testing the zero torque of the motor.
Drawings
FIG. 1 is a system block diagram of a motor torque testing platform according to an embodiment;
fig. 2 is a graph of reference of a sliding speed curve of an electric vehicle motor to be tested according to an embodiment;
FIG. 3 is a torque test reference diagram of a dynamometer according to an embodiment;
fig. 4 is a reference diagram for actual testing of an electric vehicle motor to be tested according to an embodiment.
Reference numerals illustrate:
1. the power measuring machine comprises a power measuring machine,
2. the first coupling part is provided with a first coupling part,
3. a connecting flange is connected with the connecting flange,
4. the torque sensor is provided with a sensor for detecting the torque,
5. the second coupling part is provided with a second coupling part,
6. the motor is to be tested.
Detailed Description
In order to describe the technical content, constructional features, achieved objects and effects of the technical solution in detail, the following description is made in connection with the specific embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 to 4, the embodiment relates to a testing system for zero torque of an electric vehicle motor, which comprises a dynamometer, a first coupling, a connecting flange, a torque sensor and a second coupling, wherein the dynamometer is in transmission connection with the connecting flange through the first coupling, an engine to be tested is in transmission connection with the connecting flange through the second coupling, and the torque sensor is used for testing the torque of the connecting flange.
In the use process, the connection between the dynamometer and the tested motor is disconnected through the connecting flange plate and the spline housing, and the torque of the dynamometer is tested, so that the test interference is eliminated.
And the connecting flange plate is connected with the spline housing again, sliding speed reduction is carried out according to preset settings, and the clutch box enables the engine to enter a zero torque output state.
The rear driving device is connected with the dynamometer, the overrunning clutch box is arranged between the dynamometer and the engine to be tested, the rear driving device is used as power to adjust torque, the dynamometer is driven to rotate along the rotation direction of the engine to be tested, the rotating speed of the output end of the overrunning clutch box is higher than the input rotating speed, the overrunning clutch is disengaged, the engine to be tested is disengaged from the dynamometer, and therefore the zero torque test of the engine is achieved.
Therefore, the zero torque test of the engine to be tested can be realized through the use of the test system, a certain resistance existing in the dynamometer is eliminated, actual test data is provided for correction of the sliding resistance curve, and the accuracy of the zero torque test of the motor is improved.
The embodiment also relates to a method for testing zero torque of the electric automobile motor, which comprises the following steps:
constructing a motor torque testing platform;
obtaining a function curve of real-time vehicle speed and time used when an electric vehicle motor to be tested slides from a preset vehicle speed to a zero vehicle speed in a sliding state, converting the function curve of the real-time vehicle speed and the time used into a corresponding function curve of the motor rotating speed and the time, and setting the function curve as a first function curve;
specifically, a curve of the sliding speed and time of the whole vehicle is obtained, and the curve is converted into a corresponding curve of the motor rotating speed and time according to the corresponding curve of the actual sliding time and the vehicle speed of the whole vehicle.
According to the speed acceleration rate of the first function curve, the dynamometer of the torque testing platform of the testing motor is independently operated in a speed mode, the speed is accelerated from zero speed to a preset speed, the torque value of the dynamometer of the torque testing platform of the testing motor is measured, a function curve of torque change is obtained, and therefore the resistance moment T1 of the dynamometer of the torque testing platform of the motor is obtained for later use;
specifically, the connecting flange and the second coupling are disconnected, the dynamometer is operated in a rotating speed mode according to the curve of fig. 2, the torque of the torque sensor is read, and the resistance moment T1 of the dynamometer is measured and used for later calibration, as shown in fig. 3.
The motor of the electric automobile to be tested is in transmission connection with a dynamometer of a motor torque testing platform, the motor of the electric automobile to be tested runs under rated voltage, and the motor of the electric automobile to be tested runs under a zero torque state;
according to the speed acceleration rate of the first function curve, the dynamometer of the motor torque testing platform is operated in the speed mode, the speed is accelerated from zero speed to preset speed, the torque value of the dynamometer of the motor load motor torque testing platform of the electric automobile to be tested is measured, the function curve of torque change is obtained, and therefore the torque T2 of the dynamometer of the motor load motor torque testing platform of the electric automobile to be tested is obtained;
specifically, the connecting flange and the second coupling are connected, so that the dynamometer is connected with the tested motor, the motor runs under the rated voltage of the motor, the motor runs in a zero torque mode, the dynamometer runs in a rotating speed mode, and the dynamometer is converted into a corresponding curve of time and motor rotating speed according to the corresponding curve of actual sliding time and vehicle speed of the whole vehicle. The rotation speed of the dynamometer is tested according to the graph, and the actual torque T2 of the torque sensor is read.
Subtracting T1 from T2 to obtain a zero torque value T of the motor of the electric vehicle to be tested, and providing reference of actual zero torque value data for correction of the sliding resistance curve of the electric vehicle to be tested, as shown in FIG. 4.
Therefore, unlike the traditional fuel vehicle with a gearbox mechanism, the engine can be completely disconnected, the electric vehicle cannot disconnect the motor from the transmission mechanism, the whole vehicle sliding resistance curve has the state correlation with the actual motor, and the motor has the individual difference. The whole vehicle can not be collected at any time during sliding, the motor rack tests zero torque data of the motor, and actual test data is provided for correcting a sliding resistance curve; the traditional motor bench test cannot correspond to the sliding speed curve of the whole vehicle, and the zero torque test at the fixed rotating speed cannot actually reflect the actual sliding state of the whole vehicle; the dynamometer itself has certain resistance and needs to be corrected by test data of a single dynamometer.
Optionally, before the step of constructing the motor torque test platform, torque resistance analysis of the motor and the test platform is further included, mechanical friction resistance, bearing resistance, wind resistance and cooling resistance (oil-cooled motor, electromagnetic resistance and magnetic groove torque) of the motor are analyzed, if the data are analyzed, interference of the data on actual working conditions can be eliminated, and the accuracy of the test is further improved.
The demagnetizing current Id is applied above the base speed region, and a certain Iq component exists because of the problems of motor rotation precision, installation, zero setting or motor angle calibration precision and cannot be completely decoupled.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal 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 terminal. Without further limitation, an element defined by the statement "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article or terminal device comprising the element. Further, herein, "greater than," "less than," "exceeding," and the like are understood to not include the present number; "above", "below", "within" and the like are understood to include this number.
It will be appreciated by those skilled in the art that the various embodiments described above may be provided as methods, apparatus, or computer program products. These embodiments may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. All or part of the steps in the methods according to the above embodiments may be implemented by a program for instructing related hardware, and the program may be stored in a storage medium readable by a computer device, for performing all or part of the steps in the methods according to the above embodiments. The computer device includes, but is not limited to: personal computers, servers, general purpose computers, special purpose computers, network devices, embedded devices, programmable devices, intelligent mobile terminals, intelligent home devices, wearable intelligent devices, vehicle-mounted intelligent devices and the like; the storage medium includes, but is not limited to: RAM, ROM, magnetic disk, magnetic tape, optical disk, flash memory, usb disk, removable hard disk, memory card, memory stick, web server storage, web cloud storage, etc.
The embodiments described above are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a computer device to produce a machine, such that the instructions, which execute via the processor of the computer device, create means for implementing the functions specified in the flowchart block or blocks and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer device-readable memory that can direct a computer device to function in a particular manner, such that the instructions stored in the computer device-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer apparatus to cause a series of operational steps to be performed on the computer apparatus to produce a computer implemented process such that the instructions which execute on the computer apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that, although the foregoing embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concepts of the present invention, alterations and modifications to the embodiments described herein, or equivalent structures or equivalent flow transformations made by the present description and drawings, apply the above technical solution, directly or indirectly, to other relevant technical fields, all of which are included in the scope of the invention.
Claims (7)
1. The method for testing the zero torque of the motor of the electric automobile is characterized by comprising the following steps of:
constructing a motor torque testing platform;
obtaining a function curve of real-time vehicle speed and time used when an electric vehicle motor to be tested slides from a preset vehicle speed to a zero vehicle speed in a sliding state, converting the function curve of the real-time vehicle speed and the time used into a corresponding function curve of the motor rotating speed and the time, and setting the function curve as a first function curve;
according to the speed acceleration rate of the first function curve, the dynamometer of the torque testing platform of the testing motor is independently operated in a speed mode, the speed is accelerated from zero speed to a preset speed, the torque value of the dynamometer of the torque testing platform of the testing motor is measured, a function curve of torque change is obtained, and therefore the resistance moment T1 of the dynamometer of the torque testing platform of the motor is obtained for later use;
the motor of the electric automobile to be tested is in transmission connection with a dynamometer of a motor torque testing platform, the motor of the electric automobile to be tested runs under rated voltage, and the motor of the electric automobile to be tested runs under a zero torque state;
according to the speed acceleration rate of the first function curve, the dynamometer of the motor torque testing platform is operated in the speed mode, the speed is accelerated from zero speed to preset speed, the torque value of the dynamometer of the motor load motor torque testing platform of the electric automobile to be tested is measured, the function curve of torque change is obtained, and therefore the torque T2 of the dynamometer of the motor load motor torque testing platform of the electric automobile to be tested is obtained;
and subtracting T1 from T2 to obtain a zero torque value T of the motor of the electric vehicle to be tested, and providing a reference of actual zero torque value data for correction of the sliding resistance curve of the electric vehicle to be tested.
2. The method for testing zero torque of an electric automobile motor according to claim 1, wherein the method comprises the steps of: before the step of constructing the motor torque testing platform, the method further comprises moment resistance analysis of the engine and the testing platform, and analysis of mechanical friction resistance, bearing resistance, wind resistance, cooling resistance and electromagnetic resistance of the engine.
3. The method for testing zero torque of an electric automobile motor according to claim 1, wherein the method comprises the steps of: the motor torque testing platform is characterized in that the connection between the dynamometer and the tested motor is disconnected through the connecting flange plate and the spline housing, and the torque of the dynamometer is tested, so that test interference is eliminated.
4. The method for testing zero torque of an electric automobile motor according to claim 3, wherein: and the connecting flange plate is connected with the spline housing again, sliding speed reduction is carried out according to preset settings, and the clutch box enables the engine to enter a zero torque output state.
5. The method for testing zero torque of the electric automobile motor according to claim 4, wherein: the rear driving device is connected with the dynamometer, the overrunning clutch box is arranged between the dynamometer and the engine to be tested, the rear driving device is used as power to adjust torque, the dynamometer is driven to rotate along the rotation direction of the engine to be tested, the rotating speed of the output end of the overrunning clutch box is higher than the input rotating speed, the overrunning clutch is disengaged, the engine to be tested is disengaged from the dynamometer, and therefore the zero torque test of the engine is achieved.
6. A system for testing zero torque of an electric vehicle motor, comprising an execution unit, wherein the execution unit is configured to execute the method for testing zero torque of an electric vehicle motor according to any one of claims 1 to 5.
7. The electric vehicle motor zero torque testing system of claim 6, comprising a dynamometer, a first coupling, a connecting flange, a torque sensor and a second coupling, wherein the dynamometer is in driving connection with the connecting flange through the first coupling, an engine to be tested is in driving connection with the connecting flange through the second coupling, and the torque sensor is used for testing the torque of the connecting flange.
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| CN114814584B (en) * | 2022-06-20 | 2022-09-20 | 无锡市朗迪测控技术有限公司 | Vehicle powertrain testing method, system, computer device and medium |
| CN115389928A (en) * | 2022-07-29 | 2022-11-25 | 北京航天控制仪器研究所 | Hysteresis dynamic pressure motor performance test system and test method |
| CN118566727B (en) * | 2024-07-31 | 2024-09-24 | 吉林交通职业技术学院 | New energy automobile driving motor performance test device |
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