NEDC operating condition verification method, device, equipment and medium for electric vehicles

Abstract

This application relates to the field of vehicle technology, and more particularly to a method, apparatus, device, and medium for verifying the NEDC operating conditions of an electric vehicle. The method comprises: determining the number of NEDC operating condition cycles of the electric vehicle based on the warranty mileage of the electric vehicle; identifying the total NEDC operating condition of the electric vehicle from the number of cycles to generate a durability cycle operating condition; and executing the durability cycle operating condition to obtain a verification result of the electric vehicle's NEDC operating condition. This solves the problem of long test cycles and the inability to fully replace the operating conditions of the entire vehicle in related technologies. The method can simulate the actual operating conditions of the entire vehicle, effectively verifying all components of the drive motor system while significantly shortening the test cycle and reducing test costs.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a method, device, equipment and medium for verifying NEDC operating conditions of an electric vehicle. Background Art

[0002] The drive motor is the power source of new energy electric vehicles. As a core component of electric vehicles, its safety and reliability are crucial, directly impacting the safety and reliability of the entire vehicle. After the development of a drive motor assembly is completed, durability reliability testing is an important method to verify its safety and reliability.

[0003] In related technologies, GBT29307 defines a reliable durability test method for drive motors used in new energy electric vehicles, with a total operating time of 402 hours.

[0004] However, if the 120,000 km or even 150,000 km warranty of the vehicle is taken into account, the entire durability test time will reach more than 1,000 hours after the vehicle manufacturer takes the warranty mileage into account, which lasts more than two months in total, greatly extending the test cycle. In addition, this durability method has certain differences from the actual vehicle operating conditions and cannot completely replace the vehicle operating conditions, which needs to be solved urgently. Summary of the Invention

[0005] The present application provides a NEDC operating condition verification method, device, equipment and medium for electric vehicles to solve the problem of long test cycle and inability to completely replace the operating conditions of the entire vehicle in related technologies. It can simulate the actual operating conditions of the entire vehicle, and while all drive motor system components can be effectively verified, it can greatly shorten the test cycle and reduce test costs.

[0006] A first embodiment of the present application provides a NEDC operating condition verification method for an electric vehicle, comprising the following steps:

[0007] Determine the number of NEDC operating cycle periods of the electric vehicle based on the warranty mileage of the electric vehicle;

[0008] Identifying a total NEDC operating condition of the electric vehicle from the cycle number to generate an endurance cycle operating condition; and

[0009] The endurance cycle operating condition is executed to obtain a verification result of the NEDC operating condition of the electric vehicle.

[0010] Optionally, generating a durable cycle operating condition includes:

[0011] Counting the number of accelerations and decelerations, the maximum rotational acceleration, and the maximum operating speed in the total NEDC cycle;

[0012] Analyzing a verification position of the drive motor of the electric vehicle in the overall NEDC operating condition;

[0013] The endurance cycle condition is formulated according to the number of acceleration and deceleration times of the total NEDC condition, the maximum rotational acceleration, and the maximum operating speed.

[0014] Optionally, the average rotational acceleration of the endurance cycle condition is greater than the maximum rotational acceleration.

[0015] Optionally, the number of acceleration and deceleration times of the endurance cycle operating condition is greater than the number of acceleration and deceleration times of the total NEDC operating condition.

[0016] Optionally, when executing the endurance cycle condition, the number of cycle periods of the endurance cycle condition is a preset integer multiple of the number of cycles obtained from the total NEDC condition.

[0017] A second embodiment of the present application provides a NEDC operating condition verification device for an electric vehicle, comprising:

[0018] A determination module, configured to determine the number of cycles of the NEDC operating condition of the electric vehicle according to the warranty mileage of the electric vehicle;

[0019] a generating module, configured to identify a total NEDC operating condition of the electric vehicle based on the number of cycle periods and generate an endurance cycle operating condition; and

[0020] An acquisition module is used to execute the endurance cycle operating condition and obtain a verification result of the NEDC operating condition of the electric vehicle.

[0021] Optionally, the generating module is specifically configured to:

[0022] Counting the number of accelerations and decelerations, the maximum rotational acceleration, and the maximum operating speed in the total NEDC cycle;

[0023] Analyzing a verification position of the drive motor of the electric vehicle in the overall NEDC operating condition;

[0024] The endurance cycle condition is formulated according to the number of acceleration and deceleration times of the total NEDC condition, the maximum rotational acceleration, and the maximum operating speed.

[0025] Optionally, the average rotational acceleration of the endurance cycle condition is greater than the maximum rotational acceleration.

[0026] Optionally, the number of acceleration and deceleration times of the endurance cycle operating condition is greater than the number of acceleration and deceleration times of the total NEDC operating condition.

[0027] Optionally, when executing the endurance cycle condition, the number of cycle periods of the endurance cycle condition is a preset integer multiple of the number of cycles obtained from the total NEDC condition.

[0028] The third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the NEDC operating condition verification method for an electric vehicle as described in the above embodiment.

[0029] The fourth aspect of the present application provides a computer-readable storage medium on which a computer program is stored. The program is executed by a processor to implement the NEDC operating condition verification method for an electric vehicle as described in the above embodiment.

[0030] Therefore, the number of NEDC operating cycles for an electric vehicle can be determined based on its warranty mileage. The total NEDC operating condition of the electric vehicle can be identified from the number of cycles, and a durability cycle operating condition can be generated and executed to obtain verification results for the electric vehicle's NEDC operating condition. This solves the problem of long test cycles and the inability to fully replace the operating conditions of the entire vehicle in related technologies. The actual operating conditions of the entire vehicle can be simulated, effectively verifying all components of the drive motor system while significantly shortening the test cycle and reducing testing costs.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0033] Figure 1 This is a flowchart of a NEDC operating condition verification method for an electric vehicle provided according to an embodiment of the present application;

[0034] Figure 2 This is an example diagram of a NEDC operating cycle according to one embodiment of the present application;

[0035] Figure 3 This is an example diagram of NEDC operating mode rotational acceleration analysis according to one embodiment of the present application;

[0036] Figure 4 This is an example diagram of a cyclic durability operating condition according to one embodiment of the present application;

[0037] Figure 5 Schematic diagram of the structure of the NEDC operating condition verification device for an electric vehicle provided according to an embodiment of the present application;

[0038] Figure 6 A block diagram of an electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0039] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0040] The following describes the NEDC operating condition verification method, device, equipment and medium of the electric vehicle of the embodiment of the present application with reference to the accompanying drawings. In response to the problem of long test cycle mentioned in the above background technology center, the present application provides a NEDC operating condition verification method for an electric vehicle. In this method, the number of cycles of the NEDC operating condition of the electric vehicle can be determined based on the warranty mileage of the electric vehicle, and the total NEDC operating condition of the electric vehicle can be identified by the number of cycles, and the endurance cycle operating condition is generated. The endurance cycle operating condition is executed to obtain the verification result of the NEDC operating condition of the electric vehicle. As a result, the problem of long test cycle and inability to completely replace the operating condition of the whole vehicle in the related technology is solved. The actual operating condition of the whole vehicle can be simulated. While the components of the drive motor system can be effectively verified, the test cycle is greatly shortened and the test cost is reduced.

[0041] Specifically, Figure 1 A flowchart of a NEDC operating condition verification method for an electric vehicle provided in an embodiment of the present application.

[0042] like Figure 1 As shown, the NEDC operating condition verification method for the electric vehicle includes the following steps:

[0043] In step S101 , the number of cycles of the NEDC operating condition of the electric vehicle is determined according to the warranty mileage of the electric vehicle.

[0044] In step S102 , the total NEDC operating condition of the electric vehicle is identified based on the cycle number, and a durability cycle operating condition is generated.

[0045] Specifically, the embodiment of the present application can analyze the NEDC operating conditions, where, for example Figure 2 As shown, Figure 2 This is a schematic diagram of a complete NEDC operating cycle, consisting of four urban operating conditions and one suburban operating condition. During the NEDC operating condition, the vehicle continuously accelerates and decelerates. These accelerations and decelerations are analyzed and converted into actual operating conditions for the corresponding drive motors through system simulation. The resulting speed and torque of the electric drive system are then analyzed. In this embodiment, the number of NEDC operating cycle cycles can be determined based on the guaranteed mileage, referred to as the total NEDC operating condition for that guaranteed mileage.

[0046] In step S103 , the endurance cycle operating condition is executed to obtain the verification result of the NEDC operating condition of the electric vehicle.

[0047] Optionally, in some embodiments, a durability cycle condition is generated, including: counting the number of acceleration and deceleration times, the maximum rotational acceleration, and the highest operating speed in the total NEDC cycle condition; analyzing the verification position of the drive motor of the electric vehicle in the total NEDC condition; and formulating the durability cycle condition based on the number of acceleration and deceleration times, the maximum rotational acceleration, and the highest operating speed in the total NEDC condition.

[0048] Optionally, in some embodiments, the average rotational acceleration of the endurance cycle condition is greater than the maximum rotational acceleration.

[0049] Optionally, in some embodiments, the number of acceleration and deceleration times of the endurance cycle operating condition is greater than the number of acceleration and deceleration times of the total NEDC operating condition.

[0050] Optionally, in some embodiments, when executing the endurance cycle condition, the number of cycle periods of the endurance cycle condition is a preset integer multiple of the number of cycles obtained from the total NEDC condition.

[0051] Specifically, acceleration and deceleration will impose mechanical stress on the rotor and stator of the drive motor. The endurance operating condition is designed to make the mechanical stress greater than the mechanical stress defined in the total NEDC operating condition after considering the warranty mileage. The number of acceleration and deceleration times, maximum rotational acceleration, and maximum operating speed in the total NEDC cycle operating condition are counted. Figure 3 As shown, Figure 3 This is a schematic diagram of the NEDC operating condition rotational acceleration analysis. Based on the rotational acceleration data during NEDC operating condition operation, the conversion from positive rotational acceleration to negative rotational acceleration and from negative rotational acceleration to positive rotational acceleration is technically analyzed, and the number of additions and subtractions, maximum rotational speed, maximum rotational acceleration, etc. are counted.

[0052] Furthermore, the parts of the drive motor that are verified in the total NEDC operating conditions are analyzed, and the durability cycle operating conditions are formulated according to the number of acceleration and deceleration and rotational acceleration of the total NEDC operating conditions. The average rotational acceleration of the durability operating conditions must be greater than the maximum rotational acceleration of the NEDC operating conditions; the number of acceleration and deceleration of the durability operating conditions must be greater than the number of acceleration and deceleration of the total NEDC operating conditions; considering that the durability operating conditions are relatively long, the durability operating conditions are designed based on the rated power; the bearings are greatly affected by the maximum speed, and the designed durability operating conditions ensure that they run at the maximum speed of the motor for a certain period of time; the motor is designed for rapid acceleration and deceleration, and cyclic operation to achieve the strength of the guaranteed mileage and shorten the durability test verification time. Considering leaving a certain margin, the number of cycle periods is multiplied by 1.2 to finally determine the durability test conditions.

[0053] For example, if Figure 4 As shown, Figure 4This is a schematic diagram of a cyclic durability condition. In one cycle, N accelerations and decelerations are designed. The maximum speed of the drive motor is used as the maximum speed of the durability test. The average rotational acceleration and the number of accelerations and decelerations of the durability condition can be calculated to ensure that the average rotational acceleration is greater than the maximum rotational acceleration of the total NEDC condition, and the number of accelerations and decelerations of the durability condition is greater than the number of accelerations and decelerations of the total NEDC condition. Considering the long durability test cycle, the power of one cycle is less than or equal to its rated power to ensure that the temperature rise is balanced during the test operation and that over-temperature shutdown does not occur.

[0054] According to the NEDC operating condition verification method for electric vehicles proposed in the embodiments of this application, the number of NEDC operating condition cycles of the electric vehicle can be determined based on the warranty mileage of the electric vehicle. The total NEDC operating condition of the electric vehicle can be identified from the number of cycles, and a durability cycle operating condition can be generated. The durability cycle operating condition is then executed to obtain the verification result of the electric vehicle's NEDC operating condition. This solves the problem of long test cycles and the inability to fully replace the operating conditions of the entire vehicle in related technologies. The actual operating conditions of the entire vehicle can be simulated, and all drive motor system components can be effectively verified, while significantly shortening the test cycle and reducing test costs.

[0055] Next, the NEDC operating condition verification device for an electric vehicle proposed in accordance with an embodiment of the present application will be described with reference to the accompanying drawings.

[0056] Figure 5 It is a block diagram of the NEDC operating condition verification device of the electric vehicle according to an embodiment of the present application.

[0057] like Figure 5 As shown, the NEDC operating condition verification device 10 of the electric vehicle includes: a determination module 100 , a generation module 200 and an acquisition module 300 .

[0058] The determination module 100 is used to determine the number of cycles of the NEDC operating condition of the electric vehicle according to the warranty mileage of the electric vehicle;

[0059] The generating module 200 is used to identify the total NEDC operating condition of the electric vehicle based on the cycle number and generate the endurance cycle operating condition; and

[0060] The acquisition module 300 is used to execute the endurance cycle condition and obtain the verification result of the NEDC condition of the electric vehicle.

[0061] Optionally, the generating module 300 is specifically configured to:

[0062] Count the number of acceleration and deceleration times, maximum rotational acceleration, and maximum operating speed in the total NEDC cycle;

[0063] Analyze the verification location of the electric vehicle's drive motor in the overall NEDC operating conditions;

[0064] The durability cycle condition is formulated based on the number of acceleration and deceleration times, maximum rotational acceleration, and maximum operating speed of the total NEDC condition.

[0065] Optionally, the average rotational acceleration of the endurance cycle condition is greater than the maximum rotational acceleration.

[0066] Optionally, the number of acceleration and deceleration times of the endurance cycle condition is greater than the number of acceleration and deceleration times of the total NEDC condition.

[0067] Optionally, when executing the endurance cycle condition, the number of cycle periods of the endurance cycle condition is a preset integer multiple of the number of cycles obtained from the total NEDC condition.

[0068] It should be noted that the above explanation of the embodiment of the NEDC operating condition verification method for an electric vehicle is also applicable to the NEDC operating condition verification device for an electric vehicle in this embodiment, and will not be repeated here.

[0069] According to the NEDC operating condition verification device and method for electric vehicles proposed in the embodiments of the present application, the number of NEDC operating condition cycles of the electric vehicle can be determined based on the warranty mileage of the electric vehicle, and the total NEDC operating condition of the electric vehicle can be identified from the number of cycles. The endurance cycle operating condition is generated, and the endurance cycle operating condition is executed to obtain the verification result of the electric vehicle's NEDC operating condition. This solves the problem of long test cycles and the inability to fully replace the operating conditions of the entire vehicle in related technologies. The actual operating conditions of the entire vehicle can be simulated, and all drive motor system components can be effectively verified, while significantly shortening the test cycle and reducing test costs.

[0070] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device may include:

[0071] A memory 601 , a processor 602 , and a computer program stored in the memory 601 and executable on the processor 602 .

[0072] When the processor 602 executes the program, the NEDC operating condition verification method for the electric vehicle provided in the above embodiment is implemented.

[0073] Furthermore, the electronic device further includes:

[0074] The communication interface 603 is used for communication between the memory 601 and the processor 602 .

[0075] The memory 601 is used to store computer programs that can be run on the processor 602 .

[0076] The memory 601 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0077] If the memory 601, processor 602, and communication interface 603 are implemented independently, the communication interface 603, memory 601, and processor 602 can be connected to each other via a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 6 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0078] Optionally, in a specific implementation, if the memory 601, the processor 602 and the communication interface 603 are integrated on a chip, the memory 601, the processor 602 and the communication interface 603 can communicate with each other through an internal interface.

[0079] The processor 602 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0080] This embodiment also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program is configured to implement the above-mentioned NEDC operating condition verification method for an electric vehicle when the program is executed by a processor.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0082] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, "N" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0083] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0084] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiment, the N steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0085] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

Claims

1. A NEDC operating condition verification method for an electric vehicle, characterized in that: The following steps are involved: Determine the number of NEDC operating cycle periods of the electric vehicle based on the warranty mileage of the electric vehicle; Identifying a total NEDC operating condition of the electric vehicle based on the number of cycle periods to generate an endurance cycle operating condition; as well as Executing the endurance cycle operating condition to obtain a verification result of the NEDC operating condition of the electric vehicle; Among them, the generation of the durability cycle operating conditions includes: counting the number of acceleration and deceleration times, the maximum rotational acceleration, and the highest operating speed in the total NEDC cycle operating conditions; analyzing the verification position of the drive motor of the electric vehicle in the total NEDC operating conditions; and formulating the durability cycle operating conditions based on the number of acceleration and deceleration times, the maximum rotational acceleration, and the highest operating speed in the total NEDC operating conditions.

2. The method according to claim 1, characterized in that The average rotational acceleration of the endurance cycle condition is greater than the maximum rotational acceleration.

3. The method according to claim 2, characterized in that The number of acceleration and deceleration times of the endurance cycle operating condition is greater than the number of acceleration and deceleration times of the total NEDC operating condition.

4. The method according to any one of claims 1 to 3, characterized in that When executing the endurance cycle condition, the number of cycles of the endurance cycle condition is a preset integer multiple of the number of cycles obtained from the total NEDC condition.

5. A NEDC operating condition verification device for an electric vehicle, characterized in that: include: A determination module, configured to determine the number of cycles of the NEDC operating condition of the electric vehicle according to the warranty mileage of the electric vehicle; a generating module, configured to identify a total NEDC operating condition of the electric vehicle based on the number of cycle periods and generate an endurance cycle operating condition; as well as an acquisition module, configured to execute the endurance cycle operating condition and obtain a verification result of the NEDC operating condition of the electric vehicle; The generation module is specifically configured to: count the number of acceleration and deceleration times, the maximum rotational acceleration, and the maximum operating speed in the total NEDC cycle operating condition; and analyze the verification position of the drive motor of the electric vehicle in the total NEDC operating condition; The endurance cycle condition is formulated according to the number of acceleration and deceleration times of the total NEDC condition, the maximum rotational acceleration, and the maximum operating speed.

6. The device according to claim 5, characterized in that The average rotational acceleration of the endurance cycle condition is greater than the maximum rotational acceleration.

7. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the NEDC operating condition verification method for an electric vehicle as described in any one of claims 1 to 4.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the NEDC operating condition verification method for an electric vehicle as described in any one of claims 1 to 4.

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