CN109100651A - Method and device for determining performance of motor system and test equipment - Google Patents
Method and device for determining performance of motor system and test equipment Download PDFInfo
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Abstract
The invention discloses a method, a device and a test device for determining the performance of a motor system, wherein the method comprises the following steps: acquiring a torque-rotating speed curve of the whole vehicle under the NEDC and an efficiency distribution diagram of a motor system; calculating an average efficiency value of a motor system under the NEDC, a first probability value that the efficiency value is greater than or equal to a first threshold and a second probability value that the efficiency value is greater than or equal to a second threshold according to a torque-rotating speed curve of the whole vehicle under the NEDC and an efficiency distribution diagram of the motor system; and determining a comprehensive evaluation index of the motor system according to the average efficiency value, the first probability value and the second probability value, and further determining the performance of the motor system under the NEDC. The invention can evaluate whether the performance of the motor system meets the requirement of the energy consumption index of the whole vehicle or not during the vehicle production test, avoids evaluating the performance of the motor system after the whole vehicle runs under the NEDC, is beneficial to simplifying the production test process and improving the efficiency of the production test.
Description
Technical Field
The invention relates to the technical field of production tests, in particular to a method and a device for determining the performance of a motor system and test equipment.
Background
With the increasing of the automobile holding capacity, the requirements of people on the performance of the whole automobile are higher and higher. Among other things, the performance of the motor system plays a key role in the performance of the finished vehicle. Generally, when the performance of the motor system is evaluated to meet the performance requirement of the whole vehicle, an important index adopted is an efficiency distribution diagram of the motor system, that is, the efficiency of the motor system is required to be distributed in different torque and rotating speed intervals to meet a certain proportion requirement, so as to ensure that the motor system meets the performance requirement. Although the efficiency distribution diagram of the motor system can evaluate the performance level of the motor system to a certain extent, the method for evaluating the performance of the motor system has a limitation for the whole vehicle, that is, whether the performance of the motor system meets the requirement of the energy consumption index of the whole vehicle or not can not be intuitively evaluated according to the efficiency distribution diagram of the motor system.
Disclosure of Invention
The invention provides a method and a device for determining the performance of a motor system and test equipment, which are used for solving the problem that whether the performance of the motor system meets the requirement of the energy consumption index of a whole vehicle cannot be intuitively evaluated in the prior art.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a method for determining performance of a motor system, where the method includes:
acquiring a torque-rotating speed curve of the whole vehicle under a New European Driving Cycle (NEDC for short) and an efficiency distribution diagram of a motor system;
calculating an average efficiency value of the motor system under the NEDC, a first probability value that the efficiency value of the motor system is greater than or equal to a first threshold and a second probability value that the efficiency value of the motor system is greater than or equal to a second threshold according to a torque-rotating speed curve of the whole vehicle under the NEDC and the efficiency distribution diagram of the motor system;
determining a comprehensive evaluation index of the motor system according to the average efficiency value, the first probability value and the second probability value;
and determining the performance of the motor system under the NEDC according to the comprehensive evaluation index.
Preferably, acquiring a torque-speed curve of the whole vehicle under the NEDC comprises:
acquiring finished automobile input parameters;
determining a rotating speed-time curve of the whole vehicle under the NEDC and a torque-time curve of the whole vehicle under the NEDC according to the input parameters;
and determining a torque-rotating speed curve of the whole vehicle under the NEDC according to the rotating speed-time curve of the whole vehicle under the NEDC and the torque-time curve of the whole vehicle under the NEDC.
Preferably, calculating an average efficiency value of the motor system under the NEDC according to the torque-rotation speed curve of the whole vehicle under the NEDC and the efficiency distribution map of the motor system, includes:
calculating the output power value of the motor system under the NEDC according to the torque-rotating speed curve of the whole vehicle under the NEDC;
calculating an input power value of the motor system under the NEDC according to the output power value and the motor system efficiency distribution diagram;
determining an average efficiency value of the motor system at NEDC based on a ratio between the output power value and the input power value.
Preferably, calculating the input power value of the motor system under NEDC according to the output power value and the motor system efficiency distribution map includes:
determining a target efficiency value corresponding to the target torque value and the target rotating speed value in an efficiency distribution diagram of the motor system according to the target torque value and the target rotating speed value corresponding to the output power value;
and calculating the ratio between the output power value and the target efficiency value, and determining the input power value of the motor system under the NEDC.
Preferably, determining a composite evaluation indicator for the electric machine system based on the average efficiency value, the first probability value, and the second probability value comprises:
calculating a first product of the first probability value and a first weight value, a second product of the second probability value and a second weight value, and a third product sum of the average efficiency value and a third weight value, and determining a comprehensive evaluation index of the motor system;
wherein the third weight value is greater than the first weight value and the second weight value, respectively.
In a second aspect, an embodiment of the present invention further provides an apparatus for determining performance of a motor system, including:
the acquisition module is used for acquiring a torque-rotating speed curve of the whole vehicle under the NEDC and an efficiency distribution diagram of a motor system;
the calculating module is used for calculating an average efficiency value of the motor system under the NEDC, a first probability value that the efficiency value of the motor system is larger than or equal to a first threshold and a second probability value that the efficiency value of the motor system is larger than or equal to a second threshold according to a torque-rotating speed curve of the whole vehicle under the NEDC and the efficiency distribution diagram of the motor system;
a first determination module, configured to determine a comprehensive evaluation index of the motor system according to the average efficiency value, the first probability value, and the second probability value;
and the second determination module is used for determining the performance of the motor system under the NEDC according to the comprehensive evaluation index.
Preferably, the acquisition module comprises:
the acquisition submodule is used for acquiring input parameters of the whole vehicle;
the first determining submodule is used for determining a rotating speed-time curve of the whole vehicle under the NEDC and a torque-time curve of the whole vehicle under the NEDC according to the input parameters;
and the second determining submodule is used for determining a torque-rotating speed curve of the whole vehicle under the NEDC according to the rotating speed-time curve of the whole vehicle under the NEDC and the torque-time curve of the whole vehicle under the NEDC.
Preferably, the calculation module comprises:
the first calculation submodule is used for calculating the output power value of the motor system under the NEDC according to the torque-rotating speed curve of the whole vehicle under the NEDC;
the second calculation submodule is used for calculating the input power value of the motor system under the NEDC according to the output power value and the efficiency distribution diagram of the motor system;
and the third determining submodule is used for determining the average efficiency value of the motor system under the NEDC according to the ratio between the output power value and the input power value.
Preferably, the second calculation submodule includes:
the determining unit is used for determining a target efficiency value corresponding to a target torque value and a target rotating speed value in an efficiency distribution diagram of the motor system according to the target torque value and the target rotating speed value corresponding to the output power value;
and the calculating unit is used for calculating the ratio between the output power value and the target efficiency value and determining the input power value of the motor system under the NEDC.
Preferably, the first determining module comprises:
a third calculation submodule, configured to calculate a sum of a first product of the first probability value and a first weight value, a second product of the second probability value and a second weight value, and a third product of the average efficiency value and a third weight value, and determine a comprehensive evaluation index of the electric machine system;
wherein the third weight value is greater than the first weight value and the second weight value, respectively.
In a third aspect, an embodiment of the present invention further provides a testing apparatus, which includes a processor, a memory, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of the method for determining the performance of the motor system described above.
In a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the method for determining the performance of the motor system as described above.
The embodiment of the invention has the beneficial effects that:
in the scheme, a torque-rotating speed curve of the whole vehicle under the NEDC and an efficiency distribution diagram of a motor system are obtained; calculating an average efficiency value of the motor system under the NEDC, a first probability value that the efficiency value of the motor system is greater than or equal to a first threshold and a second probability value that the efficiency value of the motor system is greater than or equal to a second threshold according to a torque-rotating speed curve of the whole vehicle under the NEDC and the efficiency distribution diagram of the motor system; determining a comprehensive evaluation index of the motor system according to the average efficiency value, the first probability value and the second probability value; and determining the performance of the motor system under the NEDC according to the comprehensive evaluation index. Therefore, the performance of the motor system under the NEDC is determined by combining the torque-rotating speed curve of the whole vehicle under the NEDC and the efficiency distribution diagram of the motor system, whether the performance of the motor system meets the requirement of the energy consumption index of the whole vehicle can be evaluated during the production test of the vehicle, the performance of the motor system is not required to be evaluated after the whole vehicle runs under the NEDC, the production test process is facilitated to be simplified, and the production test efficiency is improved.
Drawings
FIG. 1 illustrates a flow chart of a method of determining motor system performance in accordance with an embodiment of the present invention;
FIG. 2 shows a flowchart for obtaining a torque-rotational speed curve of a finished vehicle under NEDC according to an embodiment of the present invention;
FIG. 3 illustrates a flow chart of an embodiment of the present invention for calculating the average efficiency rate of the motor system at NEDC;
fig. 4 shows a schematic view of a device for determining the performance of an electric motor system according to an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides a method for determining performance of a motor system, including:
step 11: and acquiring a torque-rotating speed curve of the whole vehicle under the NEDC and an efficiency distribution diagram of a motor system.
The efficiency distribution diagram of the motor system is a data curve diagram generated during motor test, and mainly reflects the motor efficiency distribution condition under different rotating speeds and torques. Typically provided by the manufacturer of the motor system.
As shown in fig. 2, acquiring a torque-rotation speed curve of the whole vehicle under NEDC specifically includes:
step 201: and acquiring finished automobile input parameters.
Specifically, the vehicle input parameters include, but are not limited to: air resistance coefficient, windward area, total vehicle mass, wheel radius, rolling resistance coefficient, reduction ratio and the like.
Step 202: and determining a rotating speed-time curve of the whole vehicle under the NEDC and a torque-time curve of the whole vehicle under the NEDC according to the input parameters.
Specifically, according to the acquired input parameters of the whole vehicle, a simulation test of the whole vehicle under the NEDC is performed to obtain a rotating speed-time curve of the whole vehicle under the NEDC, namely a curve of the rotating speed of the whole vehicle under the NEDC changing with time, and a torque-time curve of the whole vehicle under the NEDC, namely a curve of the torque of the whole vehicle under the NEDC changing with time.
Step 203: and determining a torque-rotating speed curve of the whole vehicle under the NEDC according to the rotating speed-time curve of the whole vehicle under the NEDC and the torque-time curve of the whole vehicle under the NEDC.
As an implementation mode, because a rotating speed-time curve of the whole vehicle under the NEDC and a torque-time curve of the whole vehicle under the NEDC, namely representing that the rotating speed and the torque are respectively associated with time, a torque-rotating speed curve of the whole vehicle under the NEDC can be determined according to a rotating speed-time change curve of the whole vehicle under the NEDC and a torque-time change curve of the whole vehicle under the NEDC.
As another implementation manner, a discrete algorithm processing may be performed on a rotation speed-time curve of the entire vehicle under the NEDC, that is, the total time of the entire vehicle under the NEDC is continuously divided into N equal-length time units Δ t, and a rotation speed value corresponding to each Δ t is respectively determined.
The torque-time curve of the whole vehicle under the NEDC is also subjected to discrete algorithm processing, namely the total time of the whole vehicle under the NEDC is continuously divided into N (N is a positive integer) time units delta t with equal length, and the torque value corresponding to each delta t is respectively determined. It should be noted that, in order to ensure the correlation between the rotation speed value and the torque value, the time unit when the rotation speed-time curve of the whole vehicle under the NEDC is subjected to the discrete algorithm processing, and the torque-time curve of the whole vehicle under the NEDC is also subjected to the discrete algorithm processing should be the same.
And determining the associated data of the rotating speed value and the torque value according to the rotating speed value corresponding to each delta t and the torque value corresponding to each delta t. The data related to the rotation speed value and the torque value may be discrete points where the rotation speed value and the torque value are related to Δ t, or may be a curve generated by discrete points where the rotation speed value and the torque value are related to Δ t, that is, a torque-rotation speed curve of the whole vehicle under NEDC.
In the embodiment, the torque-rotating speed curve of the whole vehicle under the NEDC is obtained, so that the performance of the motor system is favorably evaluated in combination with the efficiency of the motor system under the NEDC, and whether the performance of the motor system meets the requirement of the energy consumption index of the whole vehicle can be visually judged.
Step 12: according to a torque-rotating speed curve of the whole vehicle under the NEDC and the efficiency distribution diagram of the motor system, calculating an average efficiency value of the motor system under the NEDC, a first probability value that the efficiency value of the motor system is larger than or equal to a first threshold, and a second probability value that the efficiency value of the motor system is larger than or equal to a second threshold.
As shown in fig. 3, calculating an average efficiency value of the motor system under the NEDC according to the torque-rotation speed curve of the entire vehicle under the NEDC and the efficiency distribution map of the motor system specifically includes:
step 301: and calculating the output power value of the motor system under the NEDC according to the torque-rotating speed curve of the whole vehicle under the NEDC.
Specifically, according to a torque-rotation speed curve of the whole vehicle under NEDC, a torque value and a rotation speed value corresponding to any time are determined, and then an output power value at any time can be calculated according to the following formula.
The calculation formula of the output power is as follows:
wherein,representing the output power value, TiRepresenting the torque value, niIndicating the value of the rotational speed.
Step 302: and calculating the input power value of the motor system under the NEDC according to the output power value and the motor system efficiency distribution diagram.
The step 302 specifically includes: determining a target efficiency value corresponding to the target torque value and the target rotating speed value in an efficiency distribution diagram of the motor system according to the target torque value and the target rotating speed value corresponding to the output power value; and calculating the ratio between the output power value and the target efficiency value, and determining the input power value of the motor system under the NEDC.
Specifically, a torque-rotating speed curve of the whole vehicle under the NEDC is projected onto an efficiency distribution diagram of the motor system. Combined output powerCorresponding target torque value TiAnd a target rotational speed value niLooking up (T) on the motor efficiency distribution mapi，ni) corresponding target efficiency value etai。
The calculation formula of the input power value of the motor system under the NEDC is as follows:
wherein,representing the input power value.
Step 303: determining an average efficiency value of the motor system at NEDC based on a ratio between the output power value and the input power value.
The calculation formula of the average efficiency value of the motor system under the NEDC is as follows:
wherein,representing the average efficiency value, at represents a time unit, i.e. a discrete time constant.
Specifically, the output power corresponds to an arbitrary timeComputingObtaining the output energy in the time unit delta tFor allThe total output energy E of the motor system is obtained by integrationout(ii) a The total input energy E of the motor system can be calculated by the same methodin。
In this way, the ratio between the total output energy of the motor system and the total input energy of the motor system, i.e. E, can be determinedout/EinAnd obtaining the average efficiency of the motor system under the NEDC.
According to a torque-rotating speed curve of the whole vehicle under the NEDC and the efficiency distribution diagram of the motor system, calculating a first probability value that an efficiency value of the motor system under the NEDC is larger than or equal to a first threshold, and specifically comprising the following steps: projecting a torque-rotating speed curve of the whole vehicle under the NEDC onto a motor system efficiency distribution diagram, wherein the torque-rotating speed curve of the whole vehicle under the NEDC is composed of discrete points of association of torque and rotating speed with time units; acquiring the number of first discrete points, which are positioned in a motor system efficiency distribution diagram and have efficiency values larger than or equal to a first threshold range, in a torque-rotating speed curve (discrete points of the torque and the rotating speed associated with a time unit) of the whole vehicle under the NEDC; the ratio between the number of said first discrete points and the sum of the torque and speed and the time unit associated discrete points is calculated as a first probability value.
According to a torque-rotating speed curve of the whole vehicle under the NEDC and the efficiency distribution diagram of the motor system, calculating a second probability value that the efficiency value of the motor system under the NEDC is larger than or equal to a second threshold, and specifically comprising the following steps: projecting a torque-rotating speed curve of the whole vehicle under the NEDC onto a motor system efficiency distribution diagram, wherein the torque-rotating speed curve of the whole vehicle under the NEDC is composed of discrete points of association of torque and rotating speed with time units; acquiring the number of second discrete points, which are positioned in a motor system efficiency distribution diagram and have efficiency values larger than or equal to a second threshold range, in a torque-rotating speed curve (discrete points of the torque and the rotating speed associated with a time unit) of the whole vehicle under the NEDC; and calculating the ratio of the number of the second discrete points to the total number of the discrete points related to the time unit and the torque and the rotating speed as a second probability value.
Step 13: determining a comprehensive evaluation index of the motor system according to the average efficiency value, the first probability value and the second probability value.
Specifically, a first product of the first probability value and a first weight value, a second product of the second probability value and a second weight value, and a third product of the average efficiency value and a third weight value are calculated, and a comprehensive evaluation index of the motor system is determined.
The calculation formula of the comprehensive evaluation index of the motor system is as follows:
wherein [ I ] represents a comprehensive evaluation index of the motor system.
α1denotes a first weight value, α2representing a second weight value, α1and alpha2is used for representing the efficiency evaluation index alpha of the motor system under the actual operation condition3represents a third weight value, wherein1、α2and alpha3each having a value in the range of 0 to 1, and α3＞α1，α3＞α2. Therefore, the average efficiency is guaranteed to occupy the largest proportion in the comprehensive evaluation indexes of the motor system, and the energy consumption of the vehicle can be effectively reduced by improving the average efficiency.
θ1Representing a first probability value, preferably a probability value of the motor system efficiency being more than or equal to 85%; theta2The second probability value is preferably a probability value for a motor system efficiency of 90% or more.
It should be noted that, the higher the efficiency value of the motor system is, the higher the probability occupied by the high efficiency interval is, which indicates that the performance of the motor system is better, and several groups of value ranges can be selected more for comparison.
Step 14: and determining the performance of the motor system under the NEDC according to the comprehensive evaluation index.
In the embodiment, a torque-rotation speed curve of a finished automobile under the NEDC is projected onto an efficiency distribution diagram of a motor system, a first probability value that an efficiency value of the motor system under the NEDC is greater than or equal to a first threshold and a second probability value that the efficiency value is greater than or equal to a second threshold are calculated, and meanwhile, the average efficiency of the motor system under the NEDC is calculated; and then whether the motor system meets the whole vehicle performance and energy consumption requirements of a corresponding vehicle type is evaluated according to a comprehensive evaluation index obtained by calculating the first probability value, the second probability value and the average efficiency, the performance of the motor system is not required to be evaluated after the whole vehicle runs under the NEDC, the production test process is simplified, and the production test efficiency is improved.
In addition, if the motor system cannot meet the requirements of the whole vehicle performance and the energy consumption of the corresponding vehicle type, the design of the motor system can be optimized by combining the comprehensive evaluation index, and the occupation ratio of the high-efficiency area of the motor system under the NEDC is further improved, namely the first probability value and the second probability value are improved, so that the average efficiency under the working condition of the NEDC is improved. Therefore, the scheme can more effectively and comprehensively evaluate the performance of the motor system, is more favorable for simple and visual evaluation of the motor system by the whole vehicle, and can effectively guide the motor system to carry out the next optimization design.
As shown in fig. 4, an embodiment of the present invention further provides an apparatus for determining performance of a motor system, including:
the obtaining module 410 is configured to obtain a torque-rotation speed curve of the entire vehicle under NEDC and an efficiency distribution map of the motor system.
The calculating module 420 is configured to calculate, according to the torque-rotation speed curve of the entire vehicle under the NEDC and the efficiency distribution map of the motor system, an average efficiency value of the motor system under the NEDC, a first probability value that the efficiency value of the motor system is greater than or equal to a first threshold, and a second probability value that the efficiency value of the motor system is greater than or equal to a second threshold.
A first determination module 430 configured to determine a composite evaluation indicator of the motor system according to the average efficiency value, the first probability value, and the second probability value.
And a second determining module 440, configured to determine, according to the comprehensive evaluation index, performance of the motor system under NEDC.
Wherein, the obtaining module 410 includes:
and the acquisition submodule is used for acquiring the input parameters of the whole vehicle.
And the first determining submodule is used for determining a rotating speed-time curve of the whole vehicle under the NEDC and a torque-time curve of the whole vehicle under the NEDC according to the input parameters.
And the second determining submodule is used for determining a torque-rotating speed curve of the whole vehicle under the NEDC according to the rotating speed-time curve of the whole vehicle under the NEDC and the torque-time curve of the whole vehicle under the NEDC.
Wherein, the calculating module 420 comprises:
and the first calculation submodule is used for calculating the output power value of the motor system under the NEDC according to the torque-rotating speed curve of the whole vehicle under the NEDC.
And the second calculating submodule is used for calculating the input power value of the motor system under the NEDC according to the output power value and the efficiency distribution diagram of the motor system.
And the third determining submodule is used for determining the average efficiency value of the motor system under the NEDC according to the ratio between the output power value and the input power value.
Wherein the second computation submodule includes:
and the determining unit is used for determining a target efficiency value corresponding to the target torque value and the target rotating speed value in the efficiency distribution diagram of the motor system according to the target torque value and the target rotating speed value corresponding to the output power value.
And the calculating unit is used for calculating the ratio between the output power value and the target efficiency value and determining the input power value of the motor system under the NEDC.
Wherein the first determining module 430 includes:
and the third calculation submodule is used for calculating the sum of a first product of the first probability value and a first weighted value, a second product of the second probability value and a second weighted value and a third product of the average efficiency value and a third weighted value to determine a comprehensive evaluation index of the motor system.
Wherein the third weight value is greater than the first weight value and the second weight value, respectively.
In the scheme, a torque-rotating speed curve of the whole vehicle under the NEDC and an efficiency distribution diagram of a motor system are obtained; calculating an average efficiency value of the motor system under the NEDC, a first probability value that the efficiency value of the motor system is greater than or equal to a first threshold and a second probability value that the efficiency value of the motor system is greater than or equal to a second threshold according to a torque-rotating speed curve of the whole vehicle under the NEDC and the efficiency distribution diagram of the motor system; determining a comprehensive evaluation index of the motor system according to the average efficiency value, the first probability value and the second probability value; and determining the performance of the motor system under the NEDC according to the comprehensive evaluation index. Therefore, the performance of the motor system under the NEDC is determined by combining the torque-rotating speed curve of the whole vehicle under the NEDC and the efficiency distribution diagram of the motor system, whether the performance of the motor system meets the requirement of the energy consumption index of the whole vehicle can be evaluated during the production test of the vehicle, the performance of the motor system is not required to be evaluated after the whole vehicle runs under the NEDC, the production test process is facilitated to be simplified, and the production test efficiency is improved.
In addition, if the motor system cannot meet the requirements of the whole vehicle performance and the energy consumption of the corresponding vehicle type, the design of the motor system can be optimized by combining the comprehensive evaluation index, and the occupation ratio of the high-efficiency area of the motor system under the NEDC is further improved, namely the first probability value and the second probability value are improved, so that the average efficiency under the working condition of the NEDC is improved. Therefore, the scheme can more effectively and comprehensively evaluate the performance of the motor system, is more favorable for simple and visual evaluation of the motor system by the whole vehicle, and can effectively guide the motor system to carry out the next optimization design.
In order to better achieve the above technical effects, an embodiment of the present invention further provides a testing apparatus, which includes a processor, a memory, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method for determining the performance of the motor system as described above when executing the computer program. An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method for determining the performance of the motor system as described above are implemented.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (12)
1. A method of determining performance of an electric machine system, comprising:
acquiring a torque-rotating speed curve of the whole vehicle under a new European driving condition NEDC and an efficiency distribution diagram of a motor system;
calculating an average efficiency value of the motor system under the NEDC, a first probability value that the efficiency value of the motor system is greater than or equal to a first threshold and a second probability value that the efficiency value of the motor system is greater than or equal to a second threshold according to a torque-rotating speed curve of the whole vehicle under the NEDC and the efficiency distribution diagram of the motor system;
determining a comprehensive evaluation index of the motor system according to the average efficiency value, the first probability value and the second probability value;
and determining the performance of the motor system under the NEDC according to the comprehensive evaluation index.
2. The method of claim 1, wherein obtaining a torque-speed curve for a vehicle under NEDC comprises:
acquiring finished automobile input parameters;
determining a rotating speed-time curve of the whole vehicle under the NEDC and a torque-time curve of the whole vehicle under the NEDC according to the input parameters;
and determining a torque-rotating speed curve of the whole vehicle under the NEDC according to the rotating speed-time curve of the whole vehicle under the NEDC and the torque-time curve of the whole vehicle under the NEDC.
3. The method for determining the performance of the motor system according to claim 1, wherein calculating the average efficiency value of the motor system under the NEDC according to the torque-rotation speed curve of the whole vehicle under the NEDC and the efficiency distribution map of the motor system comprises:
calculating the output power value of the motor system under the NEDC according to the torque-rotating speed curve of the whole vehicle under the NEDC;
calculating an input power value of the motor system under the NEDC according to the output power value and the motor system efficiency distribution diagram;
determining an average efficiency value of the motor system at NEDC based on a ratio between the output power value and the input power value.
4. The method of determining system performance of an electric machine of claim 3, wherein calculating an input power value for the electric machine system at NEDC based on the output power value and the electric machine system efficiency profile comprises:
determining a target efficiency value corresponding to the target torque value and the target rotating speed value in an efficiency distribution diagram of the motor system according to the target torque value and the target rotating speed value corresponding to the output power value;
and calculating the ratio between the output power value and the target efficiency value, and determining the input power value of the motor system under the NEDC.
5. The method of determining performance of an electric motor system of claim 1, wherein determining a composite evaluation indicator for the electric motor system based on the average efficiency value, the first probability value, and the second probability value comprises:
calculating a first product of the first probability value and a first weight value, a second product of the second probability value and a second weight value, and a third product sum of the average efficiency value and a third weight value, and determining a comprehensive evaluation index of the motor system;
wherein the third weight value is greater than the first weight value and the second weight value, respectively.
6. An apparatus for determining a performance of an electric machine system, comprising:
the acquisition module is used for acquiring a torque-rotating speed curve of the whole vehicle under the NEDC and an efficiency distribution diagram of a motor system;
the calculating module is used for calculating an average efficiency value of the motor system under the NEDC, a first probability value that the efficiency value of the motor system is larger than or equal to a first threshold and a second probability value that the efficiency value of the motor system is larger than or equal to a second threshold according to a torque-rotating speed curve of the whole vehicle under the NEDC and the efficiency distribution diagram of the motor system;
a first determination module, configured to determine a comprehensive evaluation index of the motor system according to the average efficiency value, the first probability value, and the second probability value;
and the second determination module is used for determining the performance of the motor system under the NEDC according to the comprehensive evaluation index.
7. The motor system performance determining apparatus of claim 6, wherein the obtaining module comprises:
the acquisition submodule is used for acquiring input parameters of the whole vehicle;
the first determining submodule is used for determining a rotating speed-time curve of the whole vehicle under the NEDC and a torque-time curve of the whole vehicle under the NEDC according to the input parameters;
and the second determining submodule is used for determining a torque-rotating speed curve of the whole vehicle under the NEDC according to the rotating speed-time curve of the whole vehicle under the NEDC and the torque-time curve of the whole vehicle under the NEDC.
8. The motor system performance determining apparatus of claim 6, wherein the calculating module comprises:
the first calculation submodule is used for calculating the output power value of the motor system under the NEDC according to the torque-rotating speed curve of the whole vehicle under the NEDC;
the second calculation submodule is used for calculating the input power value of the motor system under the NEDC according to the output power value and the efficiency distribution diagram of the motor system;
and the third determining submodule is used for determining the average efficiency value of the motor system under the NEDC according to the ratio between the output power value and the input power value.
9. The electric machine system performance determining apparatus of claim 8, wherein the second calculation submodule comprises:
the determining unit is used for determining a target efficiency value corresponding to a target torque value and a target rotating speed value in an efficiency distribution diagram of the motor system according to the target torque value and the target rotating speed value corresponding to the output power value;
and the calculating unit is used for calculating the ratio between the output power value and the target efficiency value and determining the input power value of the motor system under the NEDC.
10. The motor system performance determination apparatus of claim 6, wherein the first determination module comprises:
a third calculation submodule, configured to calculate a sum of a first product of the first probability value and a first weight value, a second product of the second probability value and a second weight value, and a third product of the average efficiency value and a third weight value, and determine a comprehensive evaluation index of the electric machine system;
wherein the third weight value is greater than the first weight value and the second weight value, respectively.
11. A test device comprising a processor, a memory, a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method of determining the performance of an electric motor system according to any one of claims 1 to 5 when executing the computer program.
12. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the method of determining the performance of an electric machine system according to any one of claims 1 to 5.
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