CN116628984A - Electric drive efficiency calculation method and device for vehicle, vehicle and storage medium - Google Patents

Electric drive efficiency calculation method and device for vehicle, vehicle and storage medium Download PDF

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CN116628984A
CN116628984A CN202310588116.0A CN202310588116A CN116628984A CN 116628984 A CN116628984 A CN 116628984A CN 202310588116 A CN202310588116 A CN 202310588116A CN 116628984 A CN116628984 A CN 116628984A
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working condition
efficiency
point
electric drive
vehicle
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彭聪
卢国成
张扬
张泽宝
刘俊英
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Deep Blue Automotive Technology Co ltd
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Deep Blue Automotive Technology Co ltd
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Abstract

The application relates to a method and a device for calculating electric drive efficiency of a vehicle, the vehicle and a storage medium, wherein the method comprises the following steps: reading electric drive rotating speed, torque and energy data of a target vehicle under a preset working condition, and identifying a corresponding extremum according to the electric drive rotating speed, torque and energy data so as to establish an extremum working condition point matrix; dividing the extreme value working point matrix into a plurality of working point submatrices, and counting the working point number contained in each working point submatrix to generate a bench test working condition according to the counting result; and calculating the efficiency of the working point and the equivalent energy ratio of the working point in the bench test working condition to obtain the electric drive efficiency of the target vehicle. The embodiment of the application can calculate the electric drive efficiency through the duty ratio statistics of the submatrices based on the analysis of the whole vehicle working condition, greatly shortens the test time, and has high calculation efficiency, strong universality and high accuracy of calculation results.

Description

Electric drive efficiency calculation method and device for vehicle, vehicle and storage medium
Technical Field
The application relates to the technical field of electric drive control of electric automobiles, in particular to a method and a device for calculating electric drive efficiency of a vehicle, the vehicle and a storage medium.
Background
For new energy electric vehicles, the updating iteration is fast, the development period is tension, and the development cost is extremely controlled. Typical efficiency test conditions generally cover the peak performance of the product, with more comprehensive performance. But the defects are that the test has a plurality of selected points, the test period is long, and more human resources and equipment resources are occupied.
In the related art, as in patent CN114329908A, an electric driving efficiency calculating method based on clustered working condition points, the operating working condition point of the electric driving whole vehicle is determined through whole vehicle parameter analysis and calculation, and a clustering calculation method is adopted to obtain a typical working condition point, so that the electric driving efficiency is calculated.
However, in the related art, the electric drive efficiency of the whole vehicle under a specific working condition is calculated based on the existing data, the universality is poor, the clustered working condition points are more, and a large distortion risk exists, so that improvement is needed.
Disclosure of Invention
The application provides a method and a device for calculating the electric drive efficiency of a vehicle, the vehicle and a storage medium, and aims to solve the problems that in the related art, the electric drive efficiency of the whole vehicle under a specific working condition is calculated based on existing data, the universality is poor, the number of clustered abandoned working condition points is large, and a large distortion risk exists.
An embodiment of a first aspect of the present application provides a method for calculating an electric driving efficiency of a vehicle, including the steps of: reading electric drive rotating speed, torque and energy data of a target vehicle under a preset working condition, and identifying a corresponding extremum according to the electric drive rotating speed, torque and energy data so as to establish an extremum working condition point matrix; dividing the extreme value working point matrix into a plurality of working point submatrices, and counting the working point number contained in each working point submatrix to generate a bench test working condition according to a counting result; and calculating the efficiency of the working point and the equivalent energy ratio of the working point in the bench test working condition to obtain the electric drive efficiency of the target vehicle.
According to the technical means, the embodiment of the application can calculate the electric drive efficiency through the duty ratio statistics of the submatrices based on the analysis of the working condition of the whole vehicle, so that the test time is greatly shortened, the calculation efficiency is high, the universality is strong, and the accuracy of the calculation result is high.
Optionally, in an embodiment of the present application, the generating the bench test condition according to the statistical result includes: establishing a three-dimensional image of rotating speed, torque and working condition duty ratio; and generating the bench test working condition according to the three-dimensional image, the efficiency MAP rotating speed of the extreme value working point matrix, the torque boundary and the statistical result.
According to the technical means, the embodiment of the application can generate the bench test working condition according to the three-dimensional image, the efficiency MAP rotating speed of the extreme working condition point matrix, the torque boundary and the statistical result, can effectively reduce the test working condition selection points, shortens the test time, improves the working efficiency and saves the development cost.
Optionally, in one embodiment of the present application, the calculating the operating point efficiency and the equivalent energy ratio thereof in the bench test operating condition includes: and calculating the equivalent energy ratio according to the energy of the test working condition point of the bench test working condition and the energy consumption of the whole vehicle working condition.
According to the technical means, the embodiment of the application can calculate the equivalent energy duty ratio according to the energy of the test working point and the energy consumption of the whole vehicle working condition, thereby improving the working efficiency, having good universality and high accuracy of the calculation result.
Optionally, in an embodiment of the present application, the calculation formula of the electric driving efficiency is:
wherein eta is the electric driving efficiency and eta is t For the operating point efficiency, C t And the equivalent energy duty ratio of the test working condition point.
An embodiment of a second aspect of the present application provides an electric drive efficiency calculation device for a vehicle, including: the building module is used for reading the electric drive rotating speed, torque and energy data of the target vehicle under the preset working condition, and identifying a corresponding extreme value according to the electric drive rotating speed, torque and energy data so as to build an extreme value working condition point matrix; the generation module is used for dividing the extreme value working point matrix into a plurality of working point submatrices, and counting the working point number contained in each working point submatrix so as to generate a bench test working condition according to a counting result; and the calculation module is used for calculating the working point efficiency and the equivalent energy ratio of the working point efficiency in the bench test working condition so as to obtain the electric drive efficiency of the target vehicle.
Optionally, in one embodiment of the present application, the generating module includes: the building unit is used for building a three-dimensional image of the rotating speed, the torque and the working condition duty ratio; and the generating unit is used for generating the bench test working condition according to the three-dimensional image, the efficiency MAP rotating speed of the extreme value working point matrix, the torque boundary and the statistical result.
Optionally, in one embodiment of the present application, the computing module includes: and the calculating unit is used for calculating the equivalent energy ratio according to the energy of the test working condition point of the bench test working condition and the energy consumption of the whole vehicle working condition.
Optionally, in an embodiment of the present application, the calculation formula of the electric driving efficiency is:
wherein eta is the electric driving efficiency and eta is t For the operating point efficiency, C t And the equivalent energy duty ratio of the test working condition point.
An embodiment of a third aspect of the present application provides a vehicle including: the vehicle electric drive efficiency calculation method includes a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to realize the vehicle electric drive efficiency calculation method according to the embodiment.
An embodiment of a fourth aspect of the present application provides a computer-readable storage medium having stored thereon a computer program that is executed by a processor for implementing the electric drive efficiency calculation method of a vehicle as described in the above embodiment.
The embodiment of the application has the beneficial effects that:
(1) The running condition of the whole vehicle under the corresponding scene is known through statistics of submatrices formed by different working condition points, so that the test working condition points are effectively reduced, the working efficiency is improved, and the development cost is saved;
(2) The working condition points in the calculation are wider in coverage and good in universality;
(3) And the calculation time of the electric drive efficiency is shortened, and the accuracy of the calculation result is improved.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a flowchart of a method for calculating electric drive efficiency of a vehicle according to an embodiment of the present application;
fig. 2 is a schematic diagram illustrating an operation principle of an electric drive efficiency calculation method of a vehicle according to an embodiment of the present application;
FIG. 3 is a schematic diagram showing three-dimensional relationships among rotational speed, torque and number of operating points in each submatrix according to an embodiment of the present application;
FIG. 4 is a graph of a demand speed of a vehicle model in a certain operating condition according to an embodiment of the present application;
FIG. 5 is a graph of torque demand of a vehicle model in a certain operating condition according to a method of calculating electric drive efficiency of a vehicle according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an electric driving efficiency calculating device for a vehicle according to an embodiment of the present application;
fig. 7 is a schematic structural view of a vehicle according to an embodiment of the present application.
Wherein: 10-an electric drive efficiency calculation device of the vehicle; 100-building module, 200-generating module and 300-calculating module; 701-memory, 702-processor, 703-communication interface.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
The following describes a method, an apparatus, a vehicle, and a storage medium for calculating electric drive efficiency of a vehicle according to an embodiment of the present application with reference to the accompanying drawings. Aiming at the problems that in the related art mentioned in the background art, the electric drive efficiency of the whole vehicle under a specific working condition is calculated based on the existing data, the universality is poor, the number of clustered abandoned working condition points is large, and the risk of large distortion exists, the application provides a method for calculating the electric drive efficiency of the vehicle. Therefore, the problems that in the related technology, the electric drive efficiency of the whole vehicle under a specific working condition is calculated based on the existing data, the universality is poor, the number of clustered abandoned working condition points is large, and the risk of large distortion exists are solved.
Specifically, fig. 1 is a schematic flow chart of a method for calculating electric driving efficiency of a vehicle according to an embodiment of the present application.
As shown in fig. 1, the method for calculating the electric drive efficiency of the vehicle includes the steps of:
in step S101, electric drive rotation speed, torque and energy data of the target vehicle under a preset working condition are read, and corresponding extremum is identified according to the electric drive rotation speed, torque and energy data, so as to establish an extremum working condition point matrix.
It is understood that the preset conditions of the vehicle may be running conditions such as a start condition, an acceleration condition, a deceleration condition, a parking condition, and the like.
Specifically, the embodiment of the application can read the electric drive rotating speed, torque and energy data of the vehicle under certain running conditions such as a starting condition, an accelerating condition and the like through a vehicle-mounted sensor such as a rotating speed sensor and the like, and identify corresponding extremum, so that the efficiency MAP rotating speed and torque boundary is determined, an extremum working point matrix is established, the electric drive efficiency calculation efficiency is improved, the test time is greatly shortened, and the development cost is saved.
It should be noted that the acquisition frequency of the embodiment of the application when acquiring the rotating speed and the torque in the working condition of the whole vehicle can be more than or equal to 20Hz, so that the accuracy of the calculation result is ensured.
In step S102, the extremum working condition point matrix is divided into a plurality of working condition point submatrices, and the working condition points included in each working condition point submatrix are counted, so as to generate a bench test working condition according to the counted result.
It can be understood that the working condition point is a working parameter of the motor under the condition of carrying a certain specific rotating speed and torque, and the bench test working condition can be generated by counting the working condition point, so that the bench test can be performed in a targeted manner.
In the actual execution process, the embodiment of the application can be increased by taking a certain rotation speed value as a unit according to the initial rotation speed, increased by taking a certain torque value as a unit according to the initial torque, so as to form a submatrix of each working condition point, and the working condition point number in each submatrix is counted. If the initial rotation speed is 250r/min, the initial torque is 2.5 N.m, and the initial torque is 5 N.m, so that each submatrix is formed, the number of working condition points in each submatrix is counted, and therefore statistical data support is provided for the test working conditions of the bench, the test working condition points are effectively reduced, the working efficiency is improved, and the development cost is saved.
Optionally, in an embodiment of the present application, generating the bench test condition according to the statistical result includes: establishing a three-dimensional image of rotating speed, torque and working condition duty ratio; and generating a bench test working condition according to the three-dimensional image, the efficiency MAP rotating speed of the extreme working point matrix, the torque boundary and the statistical result.
It can be understood that the three-dimensional images of the rotating speed, the torque and the working condition duty ratio are established, so that the working condition duty ratio conditions under different rotating speeds and different torques can be intuitively observed, and the bench test working condition is designed in a targeted manner.
For example, each sub-matrix map may have a test operating point, e.g., 250r/min < N.ltoreq.75r/min, 2.5N.m < T.ltoreq.7.5N.m, 500r/min, 5 N.m. According to the embodiment of the application, the bench test working condition points can be designed by establishing the three-dimensional images of the rotating speed, the torque and the working condition proportion and according to the submatrices with the counted number of the working condition points larger than a certain number such as 50, so that the test working condition points are effectively reduced, the working efficiency is improved, the development cost is saved, the coverage of the working condition points is wider, and the accuracy of the calculated result is higher.
In step S103, the operating point efficiency and the equivalent energy ratio thereof in the bench test operating condition are calculated to obtain the electric drive efficiency of the target vehicle.
In the actual execution process, the embodiment of the application can realize the corresponding electric drive rotation speed N under each working condition t Torque T t Voltage U t And current I t The corresponding electric drive efficiency value under the measurement working condition point is calculated, and the calculation can be performed according to the following formula:
wherein eta t The electric driving efficiency is the working point electric driving efficiency in the electric state, namely the working point electric driving efficiency.
Further, the embodiment of the application can confirm that the calculated efficiency result data of each rotating speed torque test point is between 0 and 100 percent, and eliminates the data points which do not meet the requirement.
According to the embodiment of the application, the corresponding electric drive efficiency value under the measurement working condition point can be calculated through the corresponding electric drive rotating speed, torque, voltage and current under each working condition, so that the calculation speed is improved, the working efficiency is higher, and the development cost is saved.
The process of calculating the equivalent duty cycle of the bench test conditions will be described in detail below.
Optionally, in one embodiment of the present application, calculating the operating point efficiency and the equivalent energy ratio thereof in the bench test operating condition includes: and calculating the equivalent energy duty ratio according to the test working condition point energy of the bench test working condition and the energy consumption of the whole vehicle working condition.
Specifically, the embodiment of the application can use the rotating speed N corresponding to each test working condition point t Torque T t Kuang Dianshu S and mapping submatrices thereof t Calculate the corresponding equivalent energy E t Integrating energy of all working condition points in the working condition of the whole vehicle to calculate total energy E consumed by the working condition of the whole vehicle m According to E t And E is m The equivalent energy duty ratio C of each test working point can be calculated t 。
The energy consumption calculation formula of the whole vehicle working condition is as follows:
wherein N is i The rotation speed of the ith working condition point in the working condition of the whole vehicle is T i The torque of the ith working condition point in the whole vehicle working condition is obtained, f is working condition acquisition frequency, and k is the total number of working condition points of the whole vehicle working condition.
The equivalent duty cycle calculation formula is as follows:
the embodiment of the application can calculate the equivalent energy ratio according to the energy of the test working point of the bench test working condition and the energy consumption of the whole vehicle working condition, thereby providing data support for the follow-up calculation of the electric drive efficiency, improving the calculation speed, having higher working efficiency, saving the development cost and having more accurate calculation result.
Optionally, in an embodiment of the present application, the calculation formula of the electric driving efficiency is:
wherein eta is the electric drive efficiency, eta t For operating point efficiency, C t The equivalent energy duty cycle for the test operating point.
Referring to fig. 2 to 5, an embodiment of the present application is used to explain the working principle of the electric driving efficiency calculation method of a vehicle, and the calculation of the driving efficiency of a CLTC-P (China Light-duty Vehicle Test Cycle-Passenger, chinese Passenger car operating mode test) operating mode of a certain vehicle type specifically includes the following steps:
step S201: and collecting electric drive rotating speed and torque request data of the whole vehicle under the working condition, wherein the collecting frequency f is more than or equal to 20Hz. Identifying the extreme value of the rotating speed and the torque under the working condition of the section, wherein the rotating speed is 0-N max r/min, torque is 0-T max N.m, the design rotating speed and torque of the motor of the vehicle are larger than N of working conditions max And T max . For example, N of a certain vehicle type under the working condition of CLTC-P max 10480r/min, T max The motor may be designed to have a rotational speed of 14000r/min and a torque of 140 N.m.
Step S202: according to the initial rotation speed N S Increasing by a certain rotation speed value as a unit, and starting torque T S And increasing by taking a certain torque value as a unit to form each submatrix, and counting the number S of the working condition points in each submatrix. If the initial rotation speed is 250r/min, the initial torque is 2.5 N.m in an increasing way by taking 500r/min as a unit, each submatrix is formed by increasing the initial torque by taking 5 N.m as a unit, and the number of working condition points in each submatrix is counted. If the torque in the working condition of the whole vehicle is greater than 0, namely 46680 working condition points are taken as working condition points in a driving mode, the working condition points S with the rotating speed N being more than 250r/min and less than or equal to 750r/min and the torque T being more than 2.5 N.m and less than or equal to 7.5 N.m are screened out t There are 188 total.
The three-dimensional images of the rotating speed, the torque and the submatrices containing the working condition points are shown in fig. 3.
Step S203: according to the sub-matrix with the counted working condition points being more than 50, a bench test working condition point is designed, each sub-matrix is mapped with one test working condition point, for example, the test working condition points mapped by the sub-matrix with the working condition points being 250r/min less than or equal to 750r/min and the working condition points mapped by the sub-matrix with the working condition points being 2.5N.m less than or equal to 7.5N.m are 500r/min and 5 N.m, and the test working condition points are shown in the table 1.
TABLE 1
Furthermore, the embodiment of the application can test the working condition points of the table 1 under the rated voltage according to the steady-state point test method, and the test sequence can be developed at will, but the working condition points in the table 1 are required to be tested completely. Before the test, setting an electric drive cooling boundary according to the worst cooling condition of the product, if the cooling flow is 8L/min-12L/min, and the inlet temperature is lower than 60 ℃, setting the inlet temperature of a cooling system to 60 ℃ and setting the flow to 8L/min. In the test process, the temperature control of the motor at each working point should be executed according to the product specification, for example, the temperature of the motor at each working point is controlled according to 70+/-5 ℃.
After the test is completed, the test data needs to be processed as follows:
a) And (3) no-load compensation of the rack: confirm that the last data used for calculation has been subjected to no-load loss correction.
b) Data validity check: ensuring that the operation of the rack reaches more than 5s stability when each working point test is carried out, and selecting the rotation speed and the torque value of the working point to be averaged among 5s stability;
c) Data integrity check: it is checked whether the rotational speed torque points of the test data cover all the working conditions in table 1, and if the working conditions are incomplete, the accuracy of the calculation result will be affected.
The corresponding electric drive rotation speed N under each working condition can be obtained after the processing of the steps t Torque T t Voltage U t And current I t The corresponding electric drive efficiency value at the measurement operating point can be calculated according to the following formula:
wherein eta t The electric driving efficiency is the working point electric driving efficiency in the electric state, namely the working point electric driving efficiency.
Further, the embodiment of the application can confirm that the calculated efficiency result data of each rotating speed torque test point is between 0 and 100 percent, and eliminates the data points which do not meet the requirement.
Step S204: using the corresponding rotation speed N of each test working condition point t Torque T t Kuang Dianshu S and mapping submatrices thereof t Calculate the corresponding equivalent energy E t Integrating energy of all working condition points in the whole vehicle working condition to calculate total energy E consumed by the whole vehicle working condition m According to E t And E is m The equivalent energy duty ratio C of each test working point can be calculated t 。
The test working condition point equivalent energy calculation formula is as follows:
the total energy calculation formula of the whole vehicle working condition is as follows:
wherein N is i The rotation speed of the ith working condition point in the working condition of the whole vehicle is T i The torque of the ith working condition point in the whole vehicle working condition is obtained, f is working condition acquisition frequency, and k is the total number of working condition points of the whole vehicle working condition.
The energy duty ratio calculation formula is as follows:
step S205: according to eta t And C t The average driving efficiency η of the electric drive can be calculated, i.e. the electric drive efficiency.
The calculation formula is as follows:
further, fig. 4 and fig. 5 are a required rotation speed curve and a required torque curve of a certain vehicle model in a certain working condition, respectively.
According to the electric drive efficiency calculation method for the vehicle, provided by the embodiment of the application, the electric drive efficiency can be calculated through the occupation ratio statistics of the submatrices based on the analysis of the working condition of the whole vehicle, the test time is greatly shortened, the calculation efficiency is high, the universality is strong, and the accuracy of the calculation result is high. Therefore, the problems that in the related technology, the electric drive efficiency of the whole vehicle under a specific working condition is calculated based on the existing data, the universality is poor, the number of clustered abandoned working condition points is large, and the risk of large distortion exists are solved.
Next, an electric drive efficiency calculation device of a vehicle according to an embodiment of the present application will be described with reference to the drawings.
Fig. 6 is a block diagram schematically illustrating an electric drive efficiency calculation apparatus of a vehicle according to an embodiment of the present application.
As shown in fig. 6, the electric drive efficiency calculation device 10 of the vehicle includes: the building module 100, the generating module 200 and the calculating module 300.
Specifically, the establishing module 100 is configured to read electric drive rotation speed, torque and energy data of the target vehicle under a preset working condition, and identify a corresponding extremum according to the electric drive rotation speed, torque and energy data, so as to establish an extremum working condition point matrix.
The generating module 200 is configured to divide the extreme value working point matrix into a plurality of working point submatrices, and count the working point number included in each working point submatrix, so as to generate a bench test working condition according to the statistical result.
The calculating module 300 is configured to calculate the operating point efficiency and the equivalent energy ratio thereof in the bench test operating condition, so as to obtain the electric drive efficiency of the target vehicle.
Optionally, in one embodiment of the present application, the generating module 200 includes: the device comprises a building unit and a generating unit.
The building unit is used for building a three-dimensional image of the rotating speed, the torque and the working condition duty ratio.
The generating unit is used for generating a bench test working condition according to the three-dimensional image, the efficiency MAP rotating speed of the extreme value working point matrix, the torque boundary and the statistical result.
Optionally, in one embodiment of the present application, the computing module 300 includes: and a calculation unit.
The calculation unit is used for calculating the equivalent energy ratio according to the energy of the test working point of the bench test working condition and the energy consumption of the whole vehicle working condition.
Optionally, in an embodiment of the present application, the calculation formula of the electric driving efficiency is:
wherein eta is the electric drive efficiency, eta t For operating point efficiency, C t The equivalent energy duty cycle for the test operating point.
It should be noted that the foregoing explanation of the embodiment of the method for calculating the electric driving efficiency of the vehicle is also applicable to the apparatus for calculating the electric driving efficiency of the vehicle of this embodiment, and will not be repeated here.
According to the electric drive efficiency calculation device for the vehicle, provided by the embodiment of the application, the electric drive efficiency can be calculated through the occupation ratio statistics of the submatrices based on the analysis of the working condition of the whole vehicle, the test time is greatly shortened, the calculation efficiency is high, the universality is strong, and the accuracy of the calculation result is high. Therefore, the problems that in the related technology, the electric drive efficiency of the whole vehicle under a specific working condition is calculated based on the existing data, the universality is poor, the number of clustered abandoned working condition points is large, and the risk of large distortion exists are solved.
Fig. 7 is a schematic structural diagram of a vehicle according to an embodiment of the present application. The vehicle may include:
memory 701, processor 702, and computer programs stored on memory 701 and executable on processor 702.
The processor 702 implements the electric drive efficiency calculation method of the vehicle provided in the above embodiment when executing the program.
Further, the vehicle further includes:
a communication interface 703 for communication between the memory 701 and the processor 702.
Memory 701 for storing a computer program executable on processor 702.
The memory 701 may include high-speed RAM (Random Access Memory ) memory, and may also include non-volatile memory, such as at least one disk memory.
If the memory 701, the processor 702, and the communication interface 703 are implemented independently, the communication interface 703, the memory 701, and the processor 702 may be connected to each other through a bus and perform communication with each other. The bus may be an ISA (Industry Standard Architecture ) bus, a PCI (Peripheral Component, external device interconnect) bus, or EISA (Extended Industry Standard Architecture ) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 7, but not only one bus or one type of bus.
Alternatively, in a specific implementation, if the memory 701, the processor 702, and the communication interface 703 are integrated on a chip, the memory 701, the processor 702, and the communication interface 703 may communicate with each other through internal interfaces.
The processor 702 may be a CPU (Central Processing Unit ) or ASIC (Application Specific Integrated Circuit, application specific integrated circuit) or one or more integrated circuits configured to implement embodiments of the present application.
The embodiment of the application also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the electric drive efficiency calculation method of a vehicle as above.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or N wires, a portable computer cartridge (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (10)

1. The electric drive efficiency calculation method of the vehicle is characterized by comprising the following steps of:
reading electric drive rotating speed, torque and energy data of a target vehicle under a preset working condition, and identifying a corresponding extremum according to the electric drive rotating speed, torque and energy data so as to establish an extremum working condition point matrix;
dividing the extreme value working point matrix into a plurality of working point submatrices, and counting the working point number contained in each working point submatrix to generate a bench test working condition according to a counting result; and
and calculating the working point efficiency and the equivalent energy duty ratio of the bench test working conditions to obtain the electric drive efficiency of the target vehicle.
2. The method of claim 1, wherein generating bench test conditions based on statistics comprises:
establishing a three-dimensional image of rotating speed, torque and working condition duty ratio;
and generating the bench test working condition according to the three-dimensional image, the efficiency MAP rotating speed of the extreme value working point matrix, the torque boundary and the statistical result.
3. The method of claim 1, wherein said calculating the operating point efficiency and the equivalent energy duty cycle thereof in the bench test operating conditions comprises:
and calculating the equivalent energy ratio according to the energy of the test working condition point of the bench test working condition and the energy consumption of the whole vehicle working condition.
4. A method according to claim 3, wherein the electrical driving efficiency is calculated by the formula:
wherein eta is the electric driving efficiency and eta is t For the operating point efficiency, C t And the equivalent energy duty ratio of the test working condition point.
5. An electric drive efficiency calculation device of a vehicle, characterized by comprising:
the building module is used for reading the electric drive rotating speed, torque and energy data of the target vehicle under the preset working condition, and identifying a corresponding extreme value according to the electric drive rotating speed, torque and energy data so as to build an extreme value working condition point matrix;
the generation module is used for dividing the extreme value working point matrix into a plurality of working point submatrices, and counting the working point number contained in each working point submatrix so as to generate a bench test working condition according to a counting result; and
and the calculation module is used for calculating the operating point efficiency and the equivalent energy duty ratio of the bench test operating condition to obtain the electric drive efficiency of the target vehicle.
6. The apparatus of claim 5, wherein the generating module comprises:
the building unit is used for building a three-dimensional image of the rotating speed, the torque and the working condition duty ratio;
and the generating unit is used for generating the bench test working condition according to the three-dimensional image, the efficiency MAP rotating speed of the extreme value working point matrix, the torque boundary and the statistical result.
7. The apparatus of claim 5, wherein the computing module comprises:
and the calculating unit is used for calculating the equivalent energy ratio according to the energy of the test working condition point of the bench test working condition and the energy consumption of the whole vehicle working condition.
8. The apparatus of claim 7, wherein the electrical driving efficiency is calculated by the formula:
wherein eta is the electric driving efficiency and eta is t For the operating point efficiency, C t And the equivalent energy duty ratio of the test working condition point.
9. A vehicle, characterized by comprising: an electric drive efficiency calculation apparatus of a vehicle according to any one of claims 5 to 8.
10. A computer-readable storage medium having stored thereon a computer program, characterized in that the program is executed by a processor for realizing the electric drive efficiency calculation method of a vehicle according to any one of claims 1 to 4.
CN202310588116.0A 2023-05-23 2023-05-23 Electric drive efficiency calculation method and device for vehicle, vehicle and storage medium Pending CN116628984A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310588116.0A CN116628984A (en) 2023-05-23 2023-05-23 Electric drive efficiency calculation method and device for vehicle, vehicle and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310588116.0A CN116628984A (en) 2023-05-23 2023-05-23 Electric drive efficiency calculation method and device for vehicle, vehicle and storage medium

Publications (1)

Publication Number Publication Date
CN116628984A true CN116628984A (en) 2023-08-22

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN116628984A (en)

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