CN113064066A - Method and system for testing zero torque of electric vehicle motor - Google Patents
Method and system for testing zero torque of electric vehicle motor Download PDFInfo
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- CN113064066A CN113064066A CN202110183640.0A CN202110183640A CN113064066A CN 113064066 A CN113064066 A CN 113064066A CN 202110183640 A CN202110183640 A CN 202110183640A CN 113064066 A CN113064066 A CN 113064066A
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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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- 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, which are characterized in that a function curve of real-time speed and used time is measured by obtaining a function curve of the real-time speed and the used time when the electric automobile motor to be tested slides from a preset speed to the zero speed in a sliding state, the resistance torque T1 of a dynamometer of a motor torque testing platform is obtained firstly, then the torque T2 of the dynamometer of a motor load motor torque testing platform of the electric automobile to be tested is obtained, the T1 is subtracted from the T2, the zero torque value T of the motor of the electric automobile to be tested is obtained actually, and reference of actual zero torque value data is provided for correction of the sliding resistance curve of the electric automobile to be tested. Therefore, certain resistance existing in the dynamometer is eliminated, actual test data are provided for correcting a sliding resistance curve, and the accuracy of the test of the 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 test system for an electric automobile motor.
Background
The electric automobile industry develops rapidly, and compared with the traditional passenger car, the power assembly part of the electric automobile is changed into a motor and a reducer (pure electric) from the original combination of an engine and a gearbox. The most important problem is that the power transmission structure of the motor and the reducer cannot be separated from the wheels, so that even if the electric automobile slides in a neutral gear, the motor is in a zero-torque mode, and certain resistance cannot be avoided.
The main index of the electric automobile is the driving range under the NEDC working condition, when the whole automobile bulletin is made, the hub needs to be loaded with a sliding resistance curve to fit the actual driving resistance, and the resistance curve is usually subjected to sliding test activities. When the pure electric vehicle slides, the resistance of the motor cannot be completely zero due to the reasons, and the resistance has a normal distribution trend within a certain range due to the production consistency problem of the motor. It is necessary to accurately measure the zero torque resistance of the motor, so as to more accurately fit a resistance curve.
More information about the above solution can also be found in the following documents:
in the invention patent with Chinese patent publication No. CN112026534A, a pure electric vehicle torque safety control system and method is disclosed, which 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 torque control mechanisms, and each 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, when the first microcontroller fails, the second microcontroller quickly resets the first microcontroller to enable the first microcontroller to quickly recover to normal, meanwhile, the first microcontroller and the second microcontroller are mutually verified to avoid out-of-control torque control, and the safety and the reliability of the torque control system are greatly enhanced.
In the invention patent with Chinese patent publication No. CN112146894A, a method for testing no-load loss of an electric drive assembly based on the working condition of a whole vehicle is disclosed, which comprises the following steps: selecting a working mode of the electric drive assembly in a no-load running state of the whole vehicle; building an electric drive assembly no-load loss test bench under the working mode; setting the operating condition of the 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 through a dynamometer to simulate actual running speeds of different electric automobiles, rotating speed test points and running time of each rotating speed working point are set, and test data are recorded after the output rotating speed and torque of the electric drive assembly of each measuring point are stable; and sequentially calculating the no-load loss Ploss of the electric drive assembly of each measuring point according to the test data, and obtaining a rotating speed-no-load loss curve of the electric drive assembly under the working mode through function fitting.
In the process of implementing the invention, the inventor finds that the following problems exist in the prior art:
in the existing whole vehicle test, after a vehicle slides, a resistance curve can be continuously used, subsequent sliding generally cannot be repeated, and a zero-torque dragging resistance test of a motor is necessary. The existing test method can not avoid the torque interference of the dynamometer during the test; only zero torque drag at a fixed speed is typically tested, while the speed change condition is under a coast-down curve during actual coasting.
Disclosure of Invention
Therefore, a method and a system for testing the zero torque of the motor of the electric automobile are needed to be provided, so that the problem that the torque interference of the dynamometer cannot be avoided in the prior art during testing is solved; only the technical problem of zero torque drag at a constant rotational speed is usually tested.
In order to achieve the above object, the inventor provides a method for testing zero torque of an electric vehicle motor, comprising the following steps:
constructing a motor torque test platform;
obtaining a function curve of real-time speed and used time when an electric vehicle motor to be tested slides from a preset speed to a zero speed in a sliding state, converting the function curve of the real-time speed and the used time into a corresponding function curve of motor rotating speed and time, and setting the function curve as a first function curve;
according to the rotating speed acceleration rate under the first function curve, independently operating the dynamometer of the test motor torque test platform in a rotating speed mode, accelerating from zero rotating speed to preset rotating speed, measuring the torque value of the dynamometer of the test motor torque test platform, and obtaining a function curve of torque change, so that the resistance torque T1 of the dynamometer of the motor torque test platform is obtained for later use;
the method comprises the following steps that a 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 rotating speed acceleration rate under the first function curve, the dynamometer of the test motor torque test platform operates in the rotating speed mode, accelerates from zero rotating speed to preset rotating speed, measures the torque value of the dynamometer of the motor load motor torque test platform of the electric automobile to be tested, obtains a function curve of torque change, and accordingly obtains the torque T2 of the dynamometer of the motor load motor torque test platform of the electric automobile to be tested;
and subtracting T1 from T2 to obtain the actual zero torque value T of the motor of the electric automobile to be tested, and providing reference of the actual zero torque value data for the correction of the sliding resistance curve of the electric automobile to be tested.
Before the step of constructing the motor torque test platform, the method further comprises the steps of analyzing the torque resistance of the engine 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 engine.
As an implementation mode of the invention, the motor torque test platform is constructed by disconnecting the dynamometer from the tested motor through the connecting flange plate and the spline sleeve, and testing the torque of the dynamometer, thereby eliminating test interference.
In one embodiment of the invention, the connecting flange and the spline housing are reconnected, coasting deceleration is carried out according to a predetermined setting, and the clutch case brings the engine into a zero torque output state.
As an implementation mode of the invention, 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 torque is adjusted by using the rear driving device as power, the dynamometer and the engine to be tested are driven to rotate in the rotating direction, 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 realized.
The method is characterized in that a function curve of real-time speed and used time is measured by obtaining a function curve of the real-time speed and the used time when the motor of the electric automobile to be tested slides to zero from a preset speed in a sliding state, the resistance torque T1 of the dynamometer of the motor torque test platform is obtained first, the torque T2 of the dynamometer of the motor load motor torque test platform of the electric automobile to be tested is obtained, the T1 is subtracted from the T2, the zero torque value T of the motor of the electric automobile to be tested is obtained actually, and reference of actual zero torque value data is provided for correction of the sliding resistance curve of the electric automobile to be tested. Therefore, certain resistance existing in the dynamometer is eliminated, actual test data are provided for correcting a sliding resistance curve, and the accuracy of the test of the zero torque of the motor is improved.
In order to achieve the above object, the inventor further provides a system for testing zero torque of an electric vehicle motor, which includes an execution unit, wherein the execution unit is used for executing the method for testing zero torque of the electric vehicle motor as described in any one of the inventor.
As one embodiment of the invention, the test 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.
Different from the prior art, the technical scheme provides actual test data for correcting the sliding resistance curve by eliminating certain resistance of the dynamometer, and improves the accuracy of the test of the zero torque of the motor.
Drawings
FIG. 1 is a system diagram of a motor torque test platform according to an embodiment;
FIG. 2 is a reference diagram of a coasting speed curve of an electric vehicle motor to be tested according to an embodiment;
FIG. 3 is a torque test reference map of the dynamometer machine according to an embodiment;
FIG. 4 is a reference diagram of an actual test of an electric vehicle motor to be tested according to an embodiment.
Description of reference numerals:
1. a power-measuring machine is arranged on the base,
2. the first shaft coupling is provided with a first shaft coupling,
3. a connecting flange is connected with the upper end of the connecting flange,
4. a torque sensor is arranged on the base plate and is used for measuring the torque,
5. a second shaft coupling is arranged at the second end of the shaft,
6. the motor is tested.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1 to 4, the embodiment relates to a zero-torque testing system for an electric vehicle motor, which includes 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 sleeve, and the torque of the dynamometer is tested, so that the test interference is eliminated.
The connecting flange plate and the spline sleeve are connected again, sliding deceleration is carried out according to preset setting, and the clutch box enables the engine to enter a zero-torque output state.
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 serves as power to adjust torque, the dynamometer is driven to rotate in the rotating 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 separated 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 test system, certain resistance existing in the dynamometer is eliminated, actual test data are provided for correcting a 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 the zero torque of the motor of the electric automobile, which comprises the following steps:
constructing a motor torque test platform;
obtaining a function curve of real-time speed and used time when an electric vehicle motor to be tested slides from a preset speed to a zero speed in a sliding state, converting the function curve of the real-time speed and the used time into a corresponding function curve of motor rotating speed and 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 rotating speed and time of the motor according to the actual sliding time and speed corresponding curve of the whole vehicle.
According to the rotating speed acceleration rate under the first function curve, independently operating the dynamometer of the test motor torque test platform in a rotating speed mode, accelerating from zero rotating speed to preset rotating speed, measuring the torque value of the dynamometer of the test motor torque test platform, and obtaining a function curve of torque change, so that the resistance torque T1 of the dynamometer of the motor torque test platform is obtained for later use;
specifically, the connection flange and the second coupling are disconnected, the dynamometer operates in a rotating speed mode according to the curve of fig. 2, the torque of the torque sensor is read, and the resistance torque T1 of the dynamometer is measured, so that the dynamometer is used for later calibration, as shown in fig. 3.
The method comprises the following steps that a 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 rotating speed acceleration rate under the first function curve, the dynamometer of the test motor torque test platform operates in the rotating speed mode, accelerates from zero rotating speed to preset rotating speed, measures the torque value of the dynamometer of the motor load motor torque test platform of the electric automobile to be tested, obtains a function curve of torque change, and accordingly obtains the torque T2 of the dynamometer of the motor load motor torque test platform of the electric automobile to be tested;
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 the rotating speed of the motor according to the corresponding curve of the actual sliding time and the actual 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 the T1 from the T2 to obtain the actual zero torque value T of the motor of the electric vehicle to be tested, and providing a reference of the actual zero torque value data for the correction of the sliding resistance curve of the electric vehicle to be tested, as shown in FIG. 4.
Therefore, the engine can be completely disconnected unlike the traditional fuel vehicle with a gearbox mechanism, the electric vehicle cannot disconnect the connection between the motor and the transmission mechanism, the whole vehicle sliding resistance curve has the state correlation with the actual motor, and the motor has individual difference. The whole vehicle cannot be collected at any time when sliding, and the motor bench tests the zero torque data of the motor, so that actual test data is provided for correcting a sliding resistance curve; the traditional motor rack test cannot correspond to the sliding speed curve of the whole vehicle, and the zero torque test at a fixed rotating speed cannot actually reflect the actual sliding state of the whole vehicle; the dynamometer has certain resistance, and the correction is required to be carried out through the test data of a single dynamometer.
Optionally, before the step of constructing the motor torque test platform, the method further comprises the steps of analyzing the torque resistance of the engine and the test platform, and analyzing the mechanical friction resistance, the bearing resistance, the wind resistance and the cooling resistance (the oil-cooled motor, the electromagnetic resistance and the magnetic slot torque) of the engine.
Applying the demagnetization current Id above the basic speed region, because of the problems of motor rotation precision, installation, zero setting or motor angle calibration precision, complete decoupling cannot be realized, and a certain Iq component exists.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.
As will be appreciated by one skilled in the art, the above-described embodiments may be provided as a method, apparatus, or computer program product. 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 embodiments may be implemented by a program instructing associated hardware, where the program may be stored in a storage medium readable by a computer device and used to execute all or part of the steps in the methods according to the embodiments. The computer devices, including but 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, U disk, removable hard disk, memory card, memory stick, network server storage, network cloud storage, etc.
The various 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a computer apparatus to produce a machine, such that the instructions, which execute via the processor of the computer apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer device to function in a particular manner, such that the instructions stored in the computer-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 above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (7)
1. A method for testing zero torque of an electric automobile motor is characterized by comprising the following steps:
constructing a motor torque test platform;
obtaining a function curve of real-time speed and used time when an electric vehicle motor to be tested slides from a preset speed to a zero speed in a sliding state, converting the function curve of the real-time speed and the used time into a corresponding function curve of motor rotating speed and time, and setting the function curve as a first function curve;
according to the rotating speed acceleration rate under the first function curve, independently operating the dynamometer of the test motor torque test platform in a rotating speed mode, accelerating from zero rotating speed to preset rotating speed, measuring the torque value of the dynamometer of the test motor torque test platform, and obtaining a function curve of torque change, so that the resistance torque T1 of the dynamometer of the motor torque test platform is obtained for later use;
the method comprises the following steps that a 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 rotating speed acceleration rate under the first function curve, the dynamometer of the test motor torque test platform operates in the rotating speed mode, accelerates from zero rotating speed to preset rotating speed, measures the torque value of the dynamometer of the motor load motor torque test platform of the electric automobile to be tested, obtains a function curve of torque change, and accordingly obtains the torque T2 of the dynamometer of the motor load motor torque test platform of the electric automobile to be tested;
and subtracting T1 from T2 to obtain the actual zero torque value T of the motor of the electric automobile to be tested, and providing reference of the actual zero torque value data for the correction of the sliding resistance curve of the electric automobile to be tested.
2. The method for testing the zero torque of the motor of the electric automobile according to claim 1, characterized in that: before the step of constructing the motor torque test platform, the method also comprises the torque resistance analysis of the engine and the test platform, and the mechanical friction resistance, the bearing resistance, the wind resistance, the cooling resistance and the electromagnetic resistance of the engine are analyzed.
3. The method for testing the zero torque of the motor of the electric automobile according to claim 1, characterized in that: the torque testing platform for the motor is specifically constructed by disconnecting the dynamometer from the tested motor through the connecting flange plate and the spline sleeve, and testing the torque of the dynamometer, so that testing interference is eliminated.
4. The method for testing the zero torque of the motor of the electric automobile according to claim 3, characterized in that: the connecting flange plate and the spline sleeve are connected again, sliding deceleration is carried out according to preset setting, and the clutch box enables the engine to enter a zero-torque output state.
5. The method for testing the zero torque of the motor of the electric automobile according to claim 4, wherein the method comprises the following steps: 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 serves as power to adjust torque, the dynamometer is driven to rotate in the rotating 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 separated from the dynamometer, and therefore the zero-torque test of the engine is achieved.
6. A zero-torque testing system of an electric vehicle motor is characterized by comprising an execution unit, wherein the execution unit is used for executing the zero-torque testing method of the electric vehicle motor according to any one of claims 1-5.
7. The system for testing zero torque of the motor of the electric automobile as claimed in claim 6, wherein the testing system comprises a dynamometer, a first coupling, a connecting flange, a torque sensor and a second coupling, 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.
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| 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 |
| CN115389928B (en) * | 2022-07-29 | 2024-11-05 | 北京航天控制仪器研究所 | A hysteresis dynamic pressure motor performance testing system and testing method |
| CN118566727A (en) * | 2024-07-31 | 2024-08-30 | 吉林交通职业技术学院 | New energy automobile driving motor performance test device |
| 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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