CN111289162A - Motor driving system efficiency testing method, device and system - Google Patents
Motor driving system efficiency testing method, device and system Download PDFInfo
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- CN111289162A CN111289162A CN201811498097.8A CN201811498097A CN111289162A CN 111289162 A CN111289162 A CN 111289162A CN 201811498097 A CN201811498097 A CN 201811498097A CN 111289162 A CN111289162 A CN 111289162A
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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
- G01L3/26—Devices for measuring efficiency, i.e. the ratio of power output to power input
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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, a device and a system for testing the efficiency of a motor driving system. The method comprises the following steps: determining an operation curve of a motor driving system to be tested based on the road surface running condition information; setting a plurality of sampling points according to the operation curve, and acquiring the efficiency distribution of the motor driving system to be tested at the plurality of sampling points; and searching a working area to be used from the efficiency distribution, wherein the system efficiency values contained in the working area to be used are all larger than a preset threshold value. The invention solves the technical problems that the system efficiency testing mode of the motor driving system provided by the related technology cannot fully consider the actual driving condition of the whole vehicle and the output efficiency of the speed reducer, and the calculation and evaluation of the driving range of the electric vehicle have large errors easily.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to a method, a device and a system for testing the efficiency of a motor driving system.
Background
With the rapid development of science and technology, the electric automobile is developed vigorously. However, the limited range of the electric vehicle is always a bottleneck for restricting the future development of the electric vehicle. Under the condition that the power battery technology of the electric automobile cannot make technical breakthrough, the improvement of the output efficiency of each system in the electric automobile becomes an alternative scheme for improving the driving range of the electric automobile, wherein the motor driving system is used as a driving part of the electric automobile, and the output efficiency is a key link which directly influences the driving range of the whole automobile.
In the related art, the system efficiency of the motor driving system is mainly tested by a bench test through the motor driving system. Firstly, the motor speed is divided into at least 10 speed points from 0 to the maximum speed, and 500 revolutions per minute or 1000 revolutions per minute is respectively taken as one speed point until the maximum speed. Then, torque is supplied from 0 up to the peak torque or the peak power point is reached at each rotational speed point. Although the solution can evaluate the maximum efficiency of the motor driving system, the solution fails to consider the actual driving condition of the whole vehicle, so that a system efficiency calculation result of the motor driving system has a large deviation, and meanwhile, the solution only considers the system efficiency of the motor driving system but does not consider the output efficiency of a speed reducer, which has a great influence on the calculation and evaluation of the driving range of the electric vehicle.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
At least part of embodiments of the invention provide a method, a device and a system for testing the efficiency of a motor driving system, so as to solve the technical problem that the system efficiency testing mode of the motor driving system provided in the related technology cannot fully consider the actual driving condition of the whole automobile and the output efficiency of a speed reducer, and the calculation and evaluation of the driving range of the electric automobile are easy to cause large errors.
According to an embodiment of the present invention, there is provided a method for testing efficiency of a motor driving system, including:
determining an operation curve of a motor driving system to be tested based on the road surface running condition information; setting a plurality of sampling points according to the operation curve, and acquiring the efficiency distribution of the motor driving system to be tested at the plurality of sampling points; and searching a working area to be used from the efficiency distribution, wherein the system efficiency values contained in the working area to be used are all larger than a preset threshold value.
Optionally, determining the operation curve of the motor driving system to be tested based on the road running condition information includes: determining a time variation curve of the vehicle speed based on the road surface running condition information; and converting the time-varying curve of the vehicle speed into an operation curve, wherein the operation curve is used for representing the time-varying trend of the rotating speed and the torque output by the motor of the motor driving system to be tested.
Optionally, setting a plurality of sampling points according to the operation curve, and obtaining the efficiency distribution of the motor driving system to be tested at the plurality of sampling points includes: respectively acquiring the input power and the output power of a motor driving system to be tested at each sampling point in a plurality of sampling points; calculating the system efficiency value of the motor driving system to be tested by adopting the input power and the output power at each sampling point respectively; and determining efficiency distribution according to the calculated system efficiency value.
Optionally, the respectively obtaining the input power of the motor driving system to be tested at each sampling point includes: acquiring a current value and a voltage value on a direct current bus between a motor of a motor driving system to be tested and a controller based on the rotating speed and the torque of each sampling point; and calculating by using the current value and the voltage value to obtain the input power.
Optionally, the respectively obtaining the output power of the motor driving system to be tested at each sampling point includes: acquiring the rotating speed and the torque of a dynamometer connected with a motor driving system to be tested based on the rotating speed and the torque of each sampling point; and calculating to obtain output power by adopting the rotating speed and the torque of the dynamometer.
According to an embodiment of the present invention, there is also provided an efficiency testing apparatus for a motor driving system, including:
the determining module is used for determining an operation curve of the motor driving system to be tested based on the road running condition information; the acquisition module is used for setting a plurality of sampling points according to the operation curve and acquiring the efficiency distribution of the motor driving system to be tested at the plurality of sampling points; and the searching module is used for searching the working area to be used from the efficiency distribution, wherein the system efficiency values contained in the working area to be used are all larger than a preset threshold value.
Optionally, the determining module includes: the first determining unit is used for determining a time-varying curve of the vehicle speed based on the road running condition information; and the conversion unit is used for converting the time variation curve of the vehicle speed into an operation curve, wherein the operation curve is used for representing the time variation trend of the rotating speed and the torque output by the motor of the motor driving system to be tested.
Optionally, the obtaining module includes: the acquisition unit is used for respectively acquiring the input power and the output power of the motor driving system to be tested at each sampling point in the plurality of sampling points; the calculating unit is used for calculating the system efficiency value of the motor driving system to be tested by respectively adopting the input power and the output power at each sampling point; and the second determining unit is used for determining the efficiency distribution according to the calculated system efficiency value.
Optionally, the obtaining unit includes: the first acquisition subunit is used for acquiring a current value and a voltage value on a direct current bus between a motor of the motor driving system to be tested and the controller based on the rotating speed and the torque of each sampling point; and the first calculating subunit is used for calculating the input power by adopting the current value and the voltage value.
Optionally, the obtaining unit includes: the second acquisition subunit is used for acquiring the rotating speed and the torque of the dynamometer connected with the motor driving system to be tested based on the rotating speed and the torque of each sampling point; and the second calculating subunit is used for calculating to obtain the output power by adopting the rotating speed and the torque of the dynamometer.
According to an embodiment of the present invention, there is also provided a motor driving system efficiency testing system, including: above-mentioned motor drive system efficiency testing arrangement of arbitrary one waits experimental motor drive system and dynamometer machine, wherein, waits experimental motor drive system to include: the device comprises a motor, a controller and a speed reducer, wherein the speed reducer is connected with a dynamometer through a half shaft.
In at least part of embodiments of the invention, a mode of determining an operation curve of a motor driving system to be tested based on road surface running condition information is adopted, a plurality of sampling points are arranged according to the operation curve, efficiency distribution of the motor driving system to be tested at the plurality of sampling points is obtained, a working area to be used is searched from the efficiency distribution, system efficiency values contained in the working area to be used are all larger than a preset threshold value, the purpose of fully considering the system efficiency of a motor, a controller and a speed reducer which serve as an electric automobile power assembly in the actual running process is achieved, the working range of the motor driving system which is often located in the actual using process is more accurately analyzed, and therefore, the development of the motor driving system can be guided, so that the high-efficiency working area of the motor driving system is kept in the working range of the motor driving system which is often located as much as possible, therefore, the service efficiency of the motor driving system is improved, the technical effect of the driving range of the electric automobile is improved, and the technical problem that the calculation and evaluation of the driving range of the electric automobile have large errors due to the fact that the actual driving condition of the whole automobile and the output efficiency of a speed reducer cannot be fully considered in a system efficiency testing mode of the motor driving system provided in the related technology is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a motor drive system efficiency testing system based on a vehicle working condition according to an embodiment of the invention;
FIG. 2 is a flow chart of a method for testing the efficiency of a motor drive system according to one embodiment of the present invention;
fig. 3 is a block diagram of a motor driving system efficiency testing apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In accordance with one embodiment of the present invention, there is provided an embodiment of a method for testing efficiency of a motor drive system, wherein the steps illustrated in the flowchart of the figure may be performed in a computer system, such as a set of computer executable instructions, and wherein, although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in an order different than that illustrated or described herein.
The method embodiment may be performed in a motor drive system efficiency test system. Fig. 1 is a schematic structural diagram of a motor driving system efficiency testing system based on a vehicle working condition according to an embodiment of the present invention, and as shown in fig. 1, the motor driving system efficiency testing system at least includes: control system, motor drive system and dynamometer machine. The whole motor driving system (including but not limited to a motor, a controller and a speed reducer) is installed on the stand by building a test stand, and the system efficiency of the motor driving system is tested according to the preset working condition of the whole vehicle. In the actual test process, a test bench is built by taking a motor driving system as a test object, the motor driving system is used as power input, the first end of each half shaft connected with the whole motor driving system including a speed reducer is used as an output end, and the second end of each half shaft is connected with a dynamometer, wherein the dynamometer is used for simulating road load. And setting an operation curve of the motor driving system on the control system. The curve can refer to a New European Driving Cycle (NEDC) cycle curve or a global light vehicle test program (WLTP) cycle curve, which is a curve of the change of the vehicle speed of the whole vehicle on an urban road or a highway along with time, and the curve can be converted into a curve of the change of the output rotating speed and the torque of the motor along with time to be used as an input curve of the motor driving system. The control system acquires input current and input voltage of a direct current bus side (which is positioned between a battery and a motor controller on the electric automobile and is responsible for providing energy), so as to calculate and obtain input power of the motor driving system, and the control system acquires rotating speed and torque of a dynamometer side through a sensor arranged on each half shaft, so as to calculate and obtain output power of the motor driving system. Then, the control system calculates the ratio of the output power to the input power to obtain the system efficiency of the motor driving system. Then, the control system needs to calculate the system efficiency of the corresponding motor driving system for all the collected rotating speeds and torques of the power machine side. If a plurality of efficiency points with the same rotating speed and torque exist, the average value of the efficiency points needs to be calculated to be used as the system efficiency of the motor driving system corresponding to the efficiency point. And finally, the control system draws efficiency MAP according to system efficiencies corresponding to all the rotating speeds and all the torques respectively, and searches a region of the motor driving system with the system efficiency being greater than a preset threshold (for example, 80%) on the efficiency MAP as a high-efficiency region.
It will be understood by those skilled in the art that the structure shown in fig. 1 is only an illustration, and does not limit the structure of the efficiency testing system of the motor driving system. For example, the motor drive system efficiency testing system may also include more or fewer components than shown in FIG. 1, or have a different configuration than shown in FIG. 1.
In an alternative embodiment, the control system may include one or more processors (which may include, but are not limited to, a processing device such as a Microprocessor (MCU) or a programmable logic device (FPGA)) and memory for storing data. Optionally, the control system may further include a transmission device for a communication function and an input/output device. The memory may be configured to store a computer program, for example, a software program and a module of application software, such as a computer program corresponding to the efficiency testing method for a motor driving system in an embodiment of the present invention, and the processor executes various functional applications and data processing by running the computer program stored in the memory, so as to implement the above-mentioned efficiency testing method for a motor driving system. The memory may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory may further include memory remotely located from the processor, and these remote memories may be connected to the control system via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device is used for receiving or transmitting data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the control system. In one example, the transmission device includes a Network adapter (NIC), which can be connected to other Network devices through a base station so as to communicate with the internet. In one example, the transmission device may be a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.
In this embodiment, a method for testing efficiency of a motor driving system operating in the control system is provided, and fig. 2 is a flowchart of a method for testing efficiency of a motor driving system according to an embodiment of the present invention, as shown in fig. 2, the method includes the following steps:
step S22, determining the operation curve of the motor driving system to be tested based on the road surface driving condition information;
step S24, setting a plurality of sampling points according to the operation curve, and acquiring the efficiency distribution of the motor driving system to be tested at the plurality of sampling points;
step S26, searching a work area to be used from the efficiency distribution, where the system efficiency values included in the work area to be used are all greater than a preset threshold.
Through the steps, a mode of determining the operation curve of the motor driving system to be tested based on the road surface driving condition information can be adopted, a plurality of sampling points are arranged according to the operation curve, the efficiency distribution of the motor driving system to be tested at the plurality of sampling points is obtained, a working area to be used is searched from the efficiency distribution, and the system efficiency value contained in the working area to be used is larger than a preset threshold value, so that the purpose of fully considering the system efficiency of the motor, the controller and the reducer which are taken as an electric automobile power assembly in the actual driving process is achieved, the working range of the motor driving system which is often located in the actual using process is more accurately analyzed, the development of the motor driving system can be guided, and the high-efficiency working area of the motor driving system is kept in the working range of the motor driving system which is often located as much as possible, therefore, the service efficiency of the motor driving system is improved, the technical effect of the driving range of the electric automobile is improved, and the technical problem that the calculation and evaluation of the driving range of the electric automobile have large errors due to the fact that the actual driving condition of the whole automobile and the output efficiency of a speed reducer cannot be fully considered in a system efficiency testing mode of the motor driving system provided in the related technology is solved.
Alternatively, in step S22, determining the operation curve of the motor drive system to be tested based on the road running condition information may include the following steps:
step S221, determining a time-varying curve of the vehicle speed based on the road surface running condition information;
and step S222, converting the time-varying curve of the vehicle speed into an operation curve, wherein the operation curve is used for representing the time-varying trend of the rotating speed and the torque output by the motor of the motor driving system to be tested.
The operating curve of the motor drive system can be set on the control system. The curve can refer to an NEDC (neutral-point potential DC) cycle curve or a WLTP (zero-point potential Power) cycle curve, which is a curve that the speed of the whole vehicle changes with time on an urban road or a highway, can be converted into a curve that the output rotating speed and the torque of the motor change with time, and then can be used as an input curve of the motor driving system, so that the actual road working condition is used as input, the working range of the motor driving system under the actual working condition is determined through a bench test, and the system efficiency of the motor driving system in the working range is obtained through the test.
Optionally, in step S24, setting a plurality of sampling points according to the operation curve, and obtaining the efficiency distribution of the motor driving system to be tested at the plurality of sampling points may include the following steps:
step S241, respectively acquiring the input power and the output power of the motor driving system to be tested at each sampling point in a plurality of sampling points;
step S242, calculating a system efficiency value of the motor driving system to be tested by respectively adopting input power and output power at each sampling point;
and step S243, determining efficiency distribution according to the calculated system efficiency value.
The system efficiency test method of the motor driving system provided in the related art fails to consider whether the position of the output torque required by the motor driving system on the efficiency MAP (MAP) during the driving of the entire vehicle belongs to the high efficiency region. Therefore, the input power and the output power of the motor driving system to be tested can be respectively obtained at each sampling point selected from the operation curve, and the system efficiency value of the motor driving system to be tested is calculated by adopting the input power and the output power, so that the efficiency distribution is determined.
Alternatively, in step S241, obtaining the input power of the motor driving system to be tested at each sampling point respectively may include performing the steps of:
step S2411, acquiring a current value and a voltage value on a direct current bus between a motor of a motor driving system to be tested and a controller based on the rotating speed and the torque of each sampling point;
step S2412, calculating an input power by using the current value and the voltage value.
The control system acquires the input current and the input voltage of a direct current bus side (which is positioned between a battery on the electric automobile and a motor controller and is responsible for providing energy), and then calculates to obtain the input power of the motor driving system.
Alternatively, in step S241, obtaining the output power of the motor driving system to be tested at each sampling point respectively may include performing the steps of:
step S2413, acquiring the rotating speed and the torque of a dynamometer connected with a motor driving system to be tested based on the rotating speed and the torque of each sampling point;
and step S2414, calculating to obtain output power by adopting the rotating speed and the torque of the dynamometer.
The control system acquires the rotating speed and the torque of the dynamometer side through a sensor arranged on each half shaft, and then the output power of the motor driving system is obtained through calculation.
Then, the control system needs to calculate the system efficiency of the corresponding motor driving system for all the collected rotating speeds and torques of the power machine side. If a plurality of efficiency points with the same rotating speed and torque exist, the average value of the efficiency points needs to be calculated to be used as the system efficiency of the motor driving system corresponding to the efficiency point. And finally, the control system draws efficiency MAP according to system efficiencies corresponding to all the rotating speeds and all the torques respectively, and searches a region of the motor driving system with the system efficiency being greater than a preset threshold (for example, 80%) on the efficiency MAP as a high-efficiency region.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
In this embodiment, a device for testing efficiency of a motor driving system is further provided, and the device is used to implement the foregoing embodiments and preferred embodiments, and the description of the device is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 3 is a block diagram of an efficiency testing apparatus of a motor driving system according to an embodiment of the present invention, as shown in fig. 3, the apparatus including: the determining module 10 is used for determining an operation curve of the motor driving system to be tested based on the road running condition information; the acquisition module 20 is used for setting a plurality of sampling points according to the operation curve and acquiring the efficiency distribution of the motor driving system to be tested at the plurality of sampling points; the searching module 30 is configured to search a working area to be used from the efficiency distribution, where system efficiency values included in the working area to be used are all greater than a preset threshold.
Optionally, the determining module 10 includes: a first determination unit (not shown in the figure) for determining a time-varying curve of the vehicle speed based on the road surface running condition information; and a conversion unit (not shown in the figure) for converting the vehicle speed change curve with time into an operation curve, wherein the operation curve is used for representing the change trend of the rotating speed and the torque output by the motor of the motor driving system to be tested with time.
Optionally, the obtaining module 20 includes: an acquiring unit (not shown in the figure) for acquiring the input power and the output power of the motor driving system to be tested at each of the plurality of sampling points respectively; a calculating unit (not shown in the figure) for calculating the system efficiency value of the motor driving system to be tested by respectively adopting the input power and the output power at each sampling point; and the second determining unit is used for determining the efficiency distribution according to the calculated system efficiency value.
Optionally, the obtaining unit (not shown in the figure) comprises: the first acquisition subunit (not shown in the figure) is used for acquiring a current value and a voltage value on a direct current bus between a motor of the motor driving system to be tested and the controller based on the rotating speed and the torque of each sampling point; and a first calculating subunit (not shown in the figure) for calculating the input power by using the current value and the voltage value.
Optionally, the obtaining unit (not shown in the figure) comprises: the second acquisition subunit (not shown in the figure) is used for acquiring the rotating speed and the torque of the dynamometer connected with the motor driving system to be tested based on the rotating speed and the torque of each sampling point; and a second calculating subunit (not shown in the figure) for calculating the output power by using the rotating speed and the torque of the dynamometer.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for testing the efficiency of a motor driving system is characterized by comprising the following steps:
determining an operation curve of a motor driving system to be tested based on the road surface running condition information;
setting a plurality of sampling points according to the operation curve, and acquiring the efficiency distribution of the motor driving system to be tested at the plurality of sampling points;
and searching a working area to be used from the efficiency distribution, wherein the system efficiency values contained in the working area to be used are all larger than a preset threshold value.
2. The method of claim 1, wherein determining the operating curve of the motor drive system to be tested based on the road driving condition information comprises:
determining a time-varying curve of the vehicle speed based on the road surface running condition information;
and converting the vehicle speed change curve with time into the operation curve, wherein the operation curve is used for representing the change trend of the rotating speed and the torque output by the motor of the motor driving system to be tested with time.
3. The method of claim 1, wherein setting the plurality of sampling points according to the operating curve, and obtaining the efficiency distribution of the motor drive system to be tested at the plurality of sampling points comprises:
respectively acquiring the input power and the output power of the motor driving system to be tested at each sampling point in the plurality of sampling points;
calculating a system efficiency value of the motor driving system to be tested by respectively adopting the input power and the output power at each sampling point;
and determining the efficiency distribution according to the calculated system efficiency value.
4. The method of claim 3, wherein obtaining the input power of the motor drive system under test at each sampling point comprises:
acquiring a current value and a voltage value on a direct current bus between a motor of the motor driving system to be tested and a controller based on the rotating speed and the torque of each sampling point;
and calculating the input power by adopting the current value and the voltage value.
5. The method of claim 3, wherein obtaining the output power of the motor drive system under test at each sampling point comprises:
acquiring the rotating speed and the torque of a dynamometer connected with the motor driving system to be tested based on the rotating speed and the torque of each sampling point;
and calculating to obtain the output power by adopting the rotating speed and the torque of the dynamometer.
6. An efficiency testing device for a motor driving system, comprising:
the determining module is used for determining an operation curve of the motor driving system to be tested based on the road running condition information;
the acquisition module is used for setting a plurality of sampling points according to the operation curve and acquiring the efficiency distribution of the motor driving system to be tested at the plurality of sampling points;
and the searching module is used for searching the working area to be used from the efficiency distribution, wherein the system efficiency values contained in the working area to be used are all larger than a preset threshold value.
7. The apparatus of claim 6, wherein the determining module comprises:
the first determining unit is used for determining a time-varying curve of the vehicle speed based on the road surface running condition information;
and the conversion unit is used for converting the vehicle speed change curve with time into the operation curve, wherein the operation curve is used for representing the change trend of the rotating speed and the torque output by the motor of the motor driving system to be tested with time.
8. The apparatus of claim 6, wherein the obtaining module comprises:
the acquisition unit is used for respectively acquiring the input power and the output power of the motor driving system to be tested at each sampling point in the plurality of sampling points;
the calculating unit is used for calculating the system efficiency value of the motor driving system to be tested by respectively adopting the input power and the output power at each sampling point;
and the second determining unit is used for determining the efficiency distribution according to the calculated system efficiency value.
9. The apparatus of claim 8, wherein the obtaining unit comprises:
the first acquisition subunit is used for acquiring a current value and a voltage value on a direct current bus between a motor of the motor driving system to be tested and the controller based on the rotating speed and the torque of each sampling point;
the first calculating subunit is used for calculating the input power by adopting the current value and the voltage value;
alternatively, the acquiring unit includes:
the second acquisition subunit is used for acquiring the rotating speed and the torque of the dynamometer connected with the motor driving system to be tested based on the rotating speed and the torque of each sampling point;
and the second calculating subunit is used for calculating the output power by adopting the rotating speed and the torque of the dynamometer.
10. A motor drive system efficiency testing system, comprising: the motor drive system efficiency testing apparatus of any one of claims 6 to 9, the motor drive system to be tested, and the dynamometer, wherein the motor drive system to be tested includes: the device comprises a motor, a controller and a speed reducer, wherein the speed reducer is connected with the dynamometer through a half shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811498097.8A CN111289162A (en) | 2018-12-07 | 2018-12-07 | Motor driving system efficiency testing method, device and system |
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| CN112606706A (en) * | 2020-12-21 | 2021-04-06 | 东风汽车集团有限公司 | Average efficiency optimization method and device of motor system |
| CN112781886A (en) * | 2020-12-17 | 2021-05-11 | 中国汽车技术研究中心有限公司 | Pure electric vehicle overall efficiency testing method, electronic equipment and medium |
| CN113320397A (en) * | 2021-06-21 | 2021-08-31 | 东风汽车集团股份有限公司 | Drive motor efficiency improving method based on road spectrum |
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| CN114888846A (en) * | 2022-04-21 | 2022-08-12 | 北京工业大学 | Method for testing optimal working area of small joint complete machine of service robot |
| CN115962962A (en) * | 2023-03-17 | 2023-04-14 | 中汽研新能源汽车检验中心(天津)有限公司 | Method for testing and evaluating working condition efficiency of electric drive assembly of equivalent whole vehicle |
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