Method, device and equipment for determining required power for motor driving and storage medium

Abstract

The invention relates to the technical field of vehicles, and discloses a motor driving demand power determination method and device, equipment and a storage medium, and the determination method comprises the steps: obtaining acceleration performance demand information; the acceleration performance demand information comprises target acceleration duration required for increasing the speed of the vehicle from the zero speed to the target speed; determining the required average driving power when the motor meets the corresponding acceleration performance requirement according to the acceleration performance requirement information; according to the target vehicle speed, the average driving power, the inflection point rotating speed of the motor, the wheel radius of the vehicle and the total speed ratio of a transmission system, the driving required maximum power needed when the motor meets the acceleration performance requirement is determined, a theoretical basis is provided for motor type selection matching or customization, and the situation of motor undermatching is avoided.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to a method, apparatus, device, and storage medium for determining the required power of an electric motor drive. Background Technology

[0002] During the design phase, new energy vehicles need to match or design corresponding motors according to the corresponding acceleration performance requirements in order to obtain motors that meet the corresponding acceleration performance requirements.

[0003] The relevant technology determines the theoretical driving power based on an ideal force model of the vehicle during acceleration, and then integrates and averages this theoretical driving power to select and match the motor or customize it. However, it ignores the power loss after the inflection point speed, which occurs uniformly from zero in the motor's external characteristics. This leads to a significant deviation in the determined average driving power, making the motor determined based on the average driving power unable to meet the actual acceleration performance requirements, resulting in a motor mismatch. Summary of the Invention

[0004] In view of the above problems, this application provides a method, apparatus, device and storage medium for determining the maximum drive power required by a motor to meet acceleration performance requirements.

[0005] According to one aspect of this application, a method for determining the required power of a motor drive is provided, comprising: acquiring acceleration performance requirement information; the acceleration performance requirement information including a target acceleration time required for a vehicle to accelerate from zero speed to a target speed; determining the average drive power required by the motor to meet the corresponding acceleration performance requirement based on the acceleration performance requirement information; and determining the maximum drive power required by the motor to meet the acceleration performance requirement based on the target speed, the average drive power, the inflection point speed of the motor, the wheel radius of the vehicle, and the overall speed ratio of the transmission system.

[0006] In one alternative approach, determining the average drive power required for the motor to meet the corresponding acceleration performance requirements based on the acceleration performance requirement information includes: according to the formula... The average drive power required for the motor to meet the corresponding acceleration performance requirements is calculated; where, This represents the average drive power. This indicates the target acceleration duration. Indicates the efficiency of the transmission system. Indicates vehicle mass. Represents gravitational acceleration. This represents the rolling resistance coefficient of the wheel. Indicates the target vehicle speed. Indicates the drag coefficient. Indicates the vehicle's frontal area. This represents the vehicle rotation conversion factor.

[0007] In one optional approach, determining the maximum drive power required by the motor to meet the acceleration performance requirements based on the target vehicle speed, the average drive power, the inflection point speed of the motor, the wheel radius of the vehicle, and the overall gear ratio of the transmission system includes: calculating the initial maximum drive power required by the motor based on the target vehicle speed, the average drive power, the inflection point speed of the motor, the wheel radius of the vehicle, and the overall gear ratio of the transmission system; correcting the initial maximum drive power required to obtain the maximum drive power required by the motor to meet the acceleration performance requirements; wherein the maximum drive power required is greater than the initial maximum drive power required.

[0008] In one optional approach, calculating the initial maximum drive power requirement of the motor based on the target vehicle speed, the average drive power, the inflection point speed of the motor, the wheel radius of the vehicle, and the overall speed ratio of the transmission system includes: calculating a time ratio based on the target vehicle speed, the inflection point speed of the motor, the wheel radius of the vehicle, and the overall speed ratio of the transmission system; wherein the time ratio is the ratio between the inflection point acceleration time and the target acceleration time, and the inflection point acceleration time is the time required for the motor speed to increase from zero to the inflection point speed; and calculating the initial maximum drive power requirement of the motor based on the average drive power and the time ratio.

[0009] In one optional approach, the time ratio is calculated based on the target vehicle speed, the inflection point speed of the motor, the wheel radius of the vehicle, and the overall speed ratio of the transmission system, including: according to the formula The time ratio was calculated; among which, This indicates the ratio of the stated durations. This indicates the acceleration duration at the inflection point. This indicates the target acceleration duration. This indicates the inflection point speed of the motor. This indicates the wheel radius of the vehicle. Indicates the target vehicle speed. The total speed ratio of the transmission system is represented; based on the average drive power and the time ratio, the initial drive demand maximum power of the motor is calculated, including: according to the formula The initial maximum power required for the drive of the motor is calculated; where, This indicates the maximum power required for the initial drive. This represents the average driving power.

[0010] In one optional approach, the initial maximum drive demand power is corrected to obtain the maximum drive demand power, which includes: multiplying the initial maximum drive demand power by a preset correction coefficient to obtain the maximum drive demand power of the motor; wherein the preset correction coefficient is greater than 1.

[0011] In one alternative approach, after determining the maximum drive power required for the motor to meet the acceleration performance requirement, the determination method includes: obtaining the actual maximum output power of the candidate motor; determining that the candidate motor meets the requirement if the actual maximum output power is greater than or equal to the maximum drive power; and determining that the candidate motor does not meet the requirement if the actual maximum power is less than the maximum drive power.

[0012] According to another aspect of this application, a device for determining the driving power requirement of an electric motor is provided, comprising: an acquisition module for acquiring acceleration performance requirement information; the acceleration performance requirement information including a target acceleration time required for a vehicle to accelerate from zero speed to a target speed; a first determination module for determining, based on the acceleration performance requirement information, the average driving power required by the motor to meet the corresponding acceleration performance requirement; and a second determination module for determining, based on the target speed, the average driving power, the inflection point speed of the motor, the wheel radius of the vehicle, and the overall speed ratio of the transmission system, the maximum driving power required by the motor to meet the acceleration performance requirement.

[0013] According to one aspect of this application, an electronic device is provided, comprising: a processor; and a memory for storing one or more programs, which, when executed by the processor, perform the determination method described above.

[0014] According to one aspect of this application, a computer-readable storage medium is also provided, on which computer-readable instructions are stored, which, when executed by a computer's processor, cause the computer to perform the determination method described above.

[0015] According to one aspect of this application, a computer program product or computer program is also provided, comprising computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the determination method described above.

[0016] Related technologies assume that the motor's output power continuously increases during vehicle acceleration. However, this application considers the inflection point that exists during speed increase. That is, when the vehicle speed increases from zero to the inflection point speed, the motor's output power is limited and will not continue to increase, subsequently outputting constant power or a reduced power. Based on the target acceleration time required for the vehicle speed to increase from zero to the target speed and the motor's theoretical drive power, this application determines the average drive power of the motor during acceleration. Furthermore, based on the motor's inflection point speed, wheel radius, target vehicle speed, overall transmission ratio, and average drive power, it determines the maximum drive power required for the motor to meet acceleration performance requirements. This provides a theoretical basis for motor selection, matching, or customization, avoiding situations where the motor is mismatched.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0019] Figure 1 This is a flowchart illustrating a method for determining the required power of a motor drive, as shown in an exemplary embodiment of this application.

[0020] Figure 2 This is a graph showing the trend of the output power of an ideal motor during vehicle acceleration.

[0021] Figure 3 This is a graph showing the changing trend of the output power of another ideal motor during vehicle acceleration.

[0022] Figure 4 This is a graph showing the trend of motor output power during the acceleration process of the vehicle in this application.

[0023] Figure 5 This is a schematic diagram illustrating an application scenario of the method for determining the required power of the motor drive in this application.

[0024] Figure 6 This is a schematic diagram of the structure of a device for determining the required power of a motor drive, as illustrated in an exemplary embodiment of this application.

[0025] Figure 7This is a schematic diagram of the structure of a computer system of an electronic device illustrated in an exemplary embodiment of this application. Detailed Implementation

[0026] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0027] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0028] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0029] In this application, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0030] The relevant technology determines the theoretical driving power based on an ideal force model of the vehicle during acceleration, and then integrates and averages this theoretical driving power to select and match the motor or customize it. However, it ignores the power loss after the inflection point in the motor's external characteristics, which involves a uniform increase in power from zero before the acceleration speed. This leads to a significant deviation in the determined average driving power, making the motor selected based on the average driving power unable to meet actual acceleration performance requirements, resulting in a mismatch between the motor and the target speed. The motor's external characteristics refer to the relationship between its output torque, power, efficiency, and speed during stable operation. We can understand it as the motor's "capability manual" or "performance ID card." It describes the externally exhibited, directly measurable, and usable operating characteristics of a motor.

[0031] Therefore, one aspect of this application provides a method for determining the required power of a motor drive, used to determine the maximum drive power required for the motor to meet acceleration performance requirements. Please refer to the following for details. Figure 1 , Figure 1 This is a schematic flowchart illustrating a method for determining the required power of a motor drive, as shown in an exemplary embodiment of this application. The method includes at least steps S110 to S130, which are described in detail below.

[0032] S110: Obtain acceleration performance requirement information; acceleration performance requirement information includes the target acceleration time required for the vehicle to accelerate from zero speed to the target speed.

[0033] The target speed is the speed the vehicle is expected to reach in the acceleration performance requirement information, and the target acceleration time is the time required for the vehicle to accelerate from zero to the target speed. Both target speed and target acceleration time are indicator parameters in the corresponding acceleration performance requirement, used to measure the vehicle's acceleration performance. This application does not specifically limit their exact values; developers can adaptively adjust these values ​​according to actual scenario requirements. For example, the acceleration performance requirement is: the vehicle is expected to accelerate from zero to 60 km / h (i.e., the target speed) within 30 seconds (i.e., the target acceleration time).

[0034] Specifically, in step S110, an acceleration performance requirement instruction issued by a user (such as a developer) can be received first. The acceleration performance requirement information carried in the instruction may include the target vehicle speed and target acceleration duration mentioned above.

[0035] S120: Determine the average drive power required for the motor to meet the corresponding acceleration performance requirements based on the acceleration performance requirement information.

[0036] Average drive power is the average power output of the motor (i.e., the drive system) during the process of a vehicle accelerating from zero speed to a target speed. Average drive power is the ratio of the work required by the motor to accelerate the vehicle from zero speed to the target acceleration time.

[0037] For example, according to the formula The average drive power required for the motor to meet the corresponding acceleration performance requirements is calculated; where, This indicates the average drive power (in kW). Indicates the target acceleration time (in seconds). Indicates the efficiency of the transmission system. Indicates the vehicle's mass (kg). This represents the acceleration due to gravity (i.e., 9.8 m / s²). 2 The unit is m / s 2 ), This represents the rolling resistance coefficient of the wheel. Indicates the target vehicle speed (in km / h). Indicates the drag coefficient. This indicates the vehicle's frontal area (in meters). 2 ), This represents the vehicle rotation conversion factor, which is empirically set to 1.

[0038] The expression for average driving power can be derived by integrating the driving power and averaging the formulas for vehicle resistance balance and power balance.

[0039] The resistance balance formula is as follows: Where F is the traction force (in N); For rolling resistance; For air resistance, For acceleration drag, 21.145 is a constant value related to air resistance; V is the vehicle speed during acceleration; the meanings of other parameters are the same as those of the parameters mentioned above.

[0040] The power balance formula is as follows: ;in, This represents the theoretical driving power output of the motor (in kW); 3600 is a unit conversion constant used for unit conversion, that is, converting the speed unit m / h to m / s; the meanings of other parameters are the same as those of the parameters mentioned above.

[0041] The vehicle accelerates from zero speed to the target speed. The required duration is the target duration ( The work required by the motor is: Because the vehicle speed increases from zero, V = 3.6at (3.6 is the unit conversion constant for converting "km / h" to "m / s"), therefore Substitute the target vehicle speed ( ) and target duration ( )get ; The average driving power was derived. ).

[0042] S130: Based on the target vehicle speed, average drive power, motor inflection point speed, vehicle wheel radius, and overall transmission ratio, determine the maximum drive power required for the motor to meet acceleration performance requirements.

[0043] The inflection point speed is the motor speed at which the motor output power reaches the inflection point power (i.e., the maximum power required for motor drive) during the acceleration process. The specific value of the inflection point speed is determined based on the motor manufacturer's design intentions or selected through experience, and this application does not limit its specific value.

[0044] The wheel radius is the radius of the vehicle's tires. The overall gear ratio of a transmission system refers to the percentage reduction in total speed (or torque amplification) between the power source (engine crankshaft or motor rotor) and the vehicle's drive wheels. The overall gear ratio of the transmission system determines how many revolutions of the drive wheels are ultimately converted from each revolution of the power source, and it is a crucial bridge connecting power output characteristics and the vehicle's actual driving performance (traction, speed).

[0045] The maximum power required for driving is the minimum power required by the motor to meet the corresponding acceleration performance requirements (i.e., to increase the vehicle speed from zero to the target speed within the target acceleration time).

[0046] For example, the initial maximum drive power demand of the motor is calculated based on the target vehicle speed, average drive power, motor inflection point speed, vehicle wheel radius and overall transmission ratio; the initial maximum drive power demand is corrected to obtain the maximum drive power demand required for the motor to meet acceleration performance requirements; the maximum drive power demand is greater than the initial maximum drive power demand.

[0047] Initial drive requirement maximum power ;in, This indicates the maximum initial drive power requirement (in kW). This represents the average drive power (in kW). is the inflection point speed of the motor; r is the wheel radius of the vehicle; denoted as 'target'; i represents the overall speed ratio of the transmission system.

[0048] In the calculation In this case, the power decay of the motor after the peak inflection point is not considered, so the result will be smaller than the actual demand, and needs to be adjusted. After correction, the maximum drive power required for the motor to meet acceleration performance requirements is obtained.

[0049] For example, the maximum initial drive power demand is multiplied by a preset correction factor to obtain the maximum drive power demand of the motor; the preset correction factor is greater than 1. That is, P m '=P m × Among them, P m P represents the maximum power required for initial drive. m ' represents the maximum power required to drive; 1 represents a preset correction factor, which is generally greater than 1. Using a preset correction factor greater than 1 compensates for the power attenuation of the motor after the peak inflection point, making the determined maximum drive power more accurate.

[0050] For example, the maximum initial drive power requirement is added to a preset correction factor to obtain the maximum drive power requirement of the motor; the preset correction factor is greater than 1. That is, P m'=P m + Among them, P m P represents the maximum power required for initial drive. m ' represents the maximum power required to drive; 2 represents a preset correction factor, which is generally greater than 0. This preset correction factor, greater than 0, is used to compensate for the power attenuation of the motor after the peak inflection point, making the determined maximum drive power more accurate.

[0051] Here is an example of how to calculate the initial maximum drive power requirement: The duration ratio is calculated based on the target vehicle speed, the motor's inflection point speed, the vehicle's wheel radius, and the overall speed ratio of the transmission system; where the duration ratio is the ratio between the inflection point acceleration time and the target acceleration time, and the inflection point acceleration time is the time required for the motor speed to increase from zero to the inflection point speed; the initial maximum drive power requirement of the motor is calculated based on the average drive power and the duration ratio.

[0052] For example, according to the formula The time ratio was calculated; among which, Indicates the ratio of duration. Indicates the duration of acceleration at the inflection point. Indicates the target acceleration time. This indicates the inflection point speed of the motor. Indicates the radius of the vehicle's wheels. Indicates the target vehicle speed. This indicates the overall speed ratio of the transmission system.

[0053] According to the formula The initial drive requirement maximum power of the motor is calculated; where, This indicates the maximum power required for the initial drive. This represents the average drive power.

[0054] The above-mentioned initial drive requirement maximum power It is from the formula The derivation obviously requires calculating the time ratio first; where t0 is the inflection point acceleration time; t1 is the target acceleration time; the meanings of other parameters are the same as those of the same parameters mentioned above.

[0055] Based on the characteristic of the electric motor having a lateral torque in the initial stage, the process of a vehicle accelerating from zero speed to the target speed can be approximated as uniform acceleration motion, that is, acceleration motion with constant acceleration. This can be derived from... ; The inflection point speed is calculated using the following formula: ;in, Speed ​​at the inflection point; The inflection point speed is denoted by ; i is the overall speed ratio of the transmission system; and r is the wheel radius. Using pi (π) and a value of 3.14, the acceleration time at the inflection point can be quickly calculated. ,so = = ;Will Substitution That is, the maximum power required for the initial drive is derived. .

[0056] Here The derivation process is introduced as follows: Based on the above resistance balance formula, the power balance formula is derived, which yields the following results: Figure 2 The power change curve shown is as follows: Figure 2 This is a graph showing the trend of the output power of an ideal motor during vehicle acceleration. Where P... e t1 is the theoretical driving power output of the motor (in kW), and t1 is the target acceleration time (in seconds).

[0057] The average drive power is obtained based on the work model of the acceleration process, that is, the work required by the motor is: Derive the average drive power ), to obtain as Figure 3 The power change curve is shown. Where P1 is the average driving power (in kW), and t1 is the target acceleration time (in seconds).

[0058] Based on the external characteristics of the motor, an equivalent work model can be constructed, such as... Figure 4 The diagram shows the motor output power during vehicle acceleration. Because the motor's external characteristics exhibit initial lateral torque, it is assumed that the vehicle's acceleration from zero to the target speed is the same (i.e., the acceleration remains constant). Here, t0 is the inflection point acceleration time (in seconds), t1 is the target acceleration time (in seconds), and P... m To drive the maximum power required (in kW), the motor output power reaches P. m At time t0, the motor's output power will be limited and will no longer increase. The motor speed at time t0 is the inflection point speed n. e (Unit: rpm), the vehicle speed at time t0 is the inflection point speed V. t0 (Unit: km / h).

[0059] The target work that the motor needs to do to increase the vehicle speed from zero to the target speed is: Figure 3 The area shown by the dashed line (the size of the dashed line area is approximately) Figure 2 (The size of the area shown by the dashed line), because Figure 2 and Figure 3 The areas of the dashed lines shown are approximately equal in size. Figure 3 The average driving power P1 in the middle must be less than Figure 2 The output power at time t1 is based on Figure 3 The content shown can be used to construct the first mapping relationship between average driving power and target power: W=P1×t1, that is, the product of average driving power and target acceleration time equals target power.

[0060] The target work required by the motor is Figure 4 The area shown by the dashed line (the size of the dashed line area is similar to...) Figure 3 The areas of the dashed lines shown are the same size, because Figure 4 and Figure 3 The areas of the dashed lines shown are equal in size. Figure 3 The average driving power P1 in the middle must be less than Figure 4 Mid-inflection point power, i.e. Figure 4 The motor output power at the mid-inflection point t0 is also the minimum maximum power required for motor drive. For the same acceleration performance requirement, a motor with an output power greater than or equal to the maximum power required for motor drive should be selected to avoid motor mismatch.

[0061] according to Figure 4 The content shown can be used to construct a second mapping relationship between the maximum power required for driving and the target work: W= Clearly, the target power serves as an intermediate bridge to determine the target mapping relationship between the maximum drive power demand and the average drive power, thereby determining the maximum drive power demand based on relevant parameters.

[0062] First mapping relation: W = P1 × t1, Second mapping relation: W = The target mapping relationship is determined based on the first and second mapping relationships: The simplified target mapping relationship is obtained as follows: .

[0063] Related technologies assume that the motor's output power continuously increases during vehicle acceleration. However, this embodiment considers the inflection point during speed increase. Specifically, when the vehicle speed increases from zero to the inflection point speed, the motor's output power is limited and will not continue to increase, subsequently outputting at a constant power or a reduced power. This application determines the average drive power of the motor during acceleration based on the target acceleration time required to increase the vehicle speed from zero to the target speed and the motor's theoretical drive power. Furthermore, based on the motor's inflection point speed, wheel radius, target vehicle speed, overall transmission ratio, and average drive power, it determines the maximum drive power required for the motor to meet acceleration performance requirements. This provides a theoretical basis for motor selection, matching, or customization, avoiding situations where the motor is mismatched.

[0064] In another exemplary embodiment, after determining the maximum drive power required for the motor to meet the acceleration performance requirements, the motor is customized based on the maximum drive power as a theoretical basis, so that the actual maximum output power of the customized motor is greater than or equal to the maximum drive power, thereby avoiding the situation where the customized motor cannot meet the acceleration performance requirements due to mismatch during actual use.

[0065] In another exemplary embodiment, after determining the maximum drive power required for the motor to meet acceleration performance requirements, the actual maximum output power of the candidate motor is obtained. If the actual maximum output power is greater than or equal to the maximum drive power, the candidate motor is determined to meet the requirements; if the actual maximum power is less than the maximum drive power, the candidate motor is determined to not meet the requirements. This embodiment selects a motor based on the maximum drive power, comparing the maximum drive power with the actual maximum output power of the candidate motor to quickly determine whether the candidate motor meets the requirements. If the actual maximum output power is greater than or equal to the maximum drive power, the candidate motor is determined to meet the requirements and can be selected as the matching motor. If the actual maximum power is less than the maximum drive power, the candidate motor is determined to not meet the requirements, and other motors need to be selected for similar matching judgment to determine the matching motor.

[0066] In another exemplary embodiment of this application, the application scenarios of the above-mentioned multiple determination methods are illustrated by way of example. Please refer to the following for details. Figure 5 , Figure 5 This is a schematic diagram illustrating an application scenario of the method for determining the required power of the motor drive according to this application. It includes an interactive page 100 and an electronic device 200, both of which can transmit data via wired or wireless communication.

[0067] Users can input their acceleration performance requirements on the interactive page 100 to match and select the appropriate vehicle's motor. For example, the acceleration performance requirement is that the vehicle needs to accelerate from 0 to 80 km / h in 2 seconds. The electronic device 200 can quickly extract 80 km / h (target vehicle speed) and 2 seconds (target acceleration time) from the interactive page 100 to determine the maximum power required for drive.

[0068] The electronic device 200 can serve as the execution subject of any of the above-described determining methods to perform any of the above-described determining methods, as illustrated below: Electronic device 200 obtains acceleration performance requirement information from interactive page 100; the acceleration performance requirement information includes the target acceleration time required for the vehicle to accelerate from zero speed to the target speed; based on the acceleration performance requirement information, it determines the average drive power required for the motor to meet the corresponding acceleration performance requirements; based on the target speed, average drive power, motor inflection point speed, vehicle wheel radius and overall transmission ratio, it determines the maximum drive power required for the motor to meet the acceleration performance requirements, and displays the maximum drive power on interactive page 100, so that the user can customize a motor that meets the requirements based on the maximum drive power.

[0069] In some embodiments, the electronic device 200 may also determine the selectable motor based on the maximum power required for driving. For example, the electronic device 200 may select motors with actual maximum output power greater than or equal to the maximum power required for driving as selectable motors and display them on the interactive page 100 so that the user can quickly determine the motor that meets the requirements.

[0070] In some embodiments, a mapping relationship is established between the calculated maximum driving power demand and its corresponding target vehicle speed and target acceleration time. This allows for direct storage of the calculated maximum driving power demand when the same vehicle speed and acceleration time are input again, based on the established mapping relationship. This enables the direct determination of the maximum driving power demand in subsequent calculations, effectively reusing historical parameters without requiring complex and redundant recalculations. For example, if the input vehicle speed is 80 km / h and the acceleration time is 2 seconds, and the electronic device 200 determines the maximum driving power demand as A, then a mapping relationship is established between "80 km / h" and "2 seconds" and "A". When the user inputs the same vehicle model, the same speed (80 km / h), and the same acceleration time (2 seconds) again, the maximum driving power demand can be directly determined to be A.

[0071] Electronic device 200 can be a terminal device (such as a computer) or an independent physical server, or a server cluster or distributed system composed of multiple physical servers, where multiple servers can form a blockchain, and the server is a node on the blockchain. It can also be a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDN (Content Delivery Network), and big data and artificial intelligence platforms. This document does not impose any restrictions on this.

[0072] Another aspect of this application provides a device for determining the power demand of a motor drive, such as... Figure 6 As shown, Figure 6 This is a schematic diagram illustrating the structure of a device for determining the required power of a motor drive, as shown in an exemplary embodiment of this application. The determining device 600 includes: The acquisition module 610 is used to acquire acceleration performance requirement information, including the target acceleration time required for the vehicle to accelerate from zero speed to the target speed.

[0073] The first determining module 630 is used to determine the average drive power required for the motor to meet the corresponding acceleration performance requirements based on the acceleration performance requirement information.

[0074] The second determining module 650 is used to determine the maximum driving power required by the motor to meet the acceleration performance requirements based on the target vehicle speed, average driving power, motor inflection point speed, vehicle wheel radius, and overall transmission system speed ratio.

[0075] In another exemplary embodiment, the first determining module 630 includes: The first determining unit is used according to the formula. The average drive power required for the motor to meet the corresponding acceleration performance requirements is calculated; where, Indicates average drive power. Indicates the target acceleration time. Indicates the efficiency of the transmission system. Indicates vehicle mass. Represents gravitational acceleration. This represents the rolling resistance coefficient of the wheel. Indicates the target vehicle speed. Indicates the drag coefficient. Indicates the vehicle's frontal area. This represents the vehicle rotation conversion factor.

[0076] In another exemplary embodiment, the first determining module 630 includes: The first calculation unit is used to calculate the maximum initial drive power requirement of the motor based on the target vehicle speed, average drive power, motor inflection point speed, vehicle wheel radius, and overall transmission system speed ratio.

[0077] The second calculation unit is used to correct the initial maximum drive power requirement to obtain the maximum drive power required for the motor to meet the acceleration performance requirements; the maximum drive power requirement is greater than the initial maximum drive power requirement.

[0078] In another exemplary embodiment, the second determining module 650 includes: The third calculation unit is used to calculate the time ratio based on the target vehicle speed, the inflection point speed of the motor, the wheel radius of the vehicle, and the total speed ratio of the transmission system. The time ratio is the ratio between the inflection point acceleration time and the target acceleration time. The inflection point acceleration time is the time required for the motor speed to increase from zero to the inflection point speed.

[0079] The fourth calculation unit is used to calculate the maximum initial drive power required by the motor based on the ratio of average drive power to duration.

[0080] In another exemplary embodiment, the third computing unit includes: The time ratio calculation section is used to calculate the ratio based on the formula. The time ratio was calculated; among which, Indicates the ratio of duration. Indicates the duration of acceleration at the inflection point. Indicates the target acceleration time. This indicates the inflection point speed of the motor. Indicates the radius of the vehicle's wheels. Indicates the target vehicle speed. This indicates the overall speed ratio of the transmission system.

[0081] The fourth calculation unit includes: The initial drive requirement maximum power calculation module is used to calculate the power based on the formula. The initial drive requirement maximum power of the motor is calculated; where, This indicates the maximum power required for the initial drive. This represents the average drive power.

[0082] In another exemplary embodiment, the second computing unit includes: The correction module is used to multiply the initial maximum drive power demand by a preset correction coefficient to obtain the maximum drive power demand of the motor; the preset correction coefficient is greater than 1.

[0083] In another exemplary embodiment, the determining device 600 further includes: The power acquisition module is used to obtain the actual maximum output power of the selected motor.

[0084] The successful selection module is used to determine whether the selected motor meets the requirements when the actual maximum output power is greater than or equal to the maximum drive power.

[0085] The selection failure module is used to determine if the selected motor does not meet the requirements when the actual maximum power is less than the maximum power required for the drive.

[0086] This application determines that the device considers the inflection point situation during vehicle speed increase. Specifically, when the vehicle speed increases from zero to the inflection point speed, the motor output power is limited and will not continue to increase, subsequently outputting constant power or a reduced power. Based on the target acceleration time required for the vehicle speed to increase from zero to the target speed and the motor's theoretical drive power, this application determines the average drive power of the motor during acceleration. Furthermore, based on the motor's inflection point speed, wheel radius, target vehicle speed, overall transmission ratio, and average drive power, it determines the maximum drive power required for the motor to meet acceleration performance requirements. This provides a theoretical basis for motor selection, matching, or customization, avoiding situations where the motor is mismatched.

[0087] It should be noted that the determining device provided in the above embodiments and the determining method provided in the foregoing embodiments belong to the same concept. The specific ways in which each module and unit performs operations have been described in detail in the method embodiments, and will not be repeated here.

[0088] Another aspect of this application provides an electronic device, including: a processor; and a memory for storing one or more programs, which, when executed by the processor, perform the determination method described above.

[0089] Please see Figure 7 , Figure 7 This is a schematic diagram of the structure of a computer system for an electronic device according to an exemplary embodiment of this application, illustrating a schematic diagram of the structure of a computer system suitable for implementing the embodiments of this application.

[0090] It should be noted that, Figure 7 The computer system 700 of the electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0091] like Figure 7 As shown, the computer system 700 includes a Central Processing Unit (CPU) 701, which can perform various appropriate actions and processes, such as executing the methods described in the above embodiments, based on programs stored in Read-Only Memory (ROM) 702 or programs loaded from storage portion 708 into Random Access Memory (RAM) 703. The RAM 703 also stores various programs and data required for system operation. The CPU 701, ROM 702, and RAM 703 are interconnected via a bus 704. An Input / Output (I / O) interface 705 is also connected to the bus 704.

[0092] The following components are connected to I / O interface 705: an input section 706 including a keyboard, mouse, etc.; an output section 707 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 708 including a hard disk, etc.; and a communication section 709 including a network interface card such as a LAN (Local Area Network) card, modem, etc. The communication section 709 performs communication processing via a network such as the Internet. A drive 710 is also connected to I / O interface 705 as needed. A removable medium 711, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on drive 710 as needed so that computer programs read from it can be installed into storage section 708 as needed.

[0093] Specifically, according to embodiments of this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program including a computer program for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 709, and / or installed from removable medium 711. When the computer program is executed by central processing unit (CPU) 701, it performs various functions defined in the system of this application.

[0094] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying a computer-readable computer program. The transmitted data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0095] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. Each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0096] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself.

[0097] Another aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the determination method as described above. This computer-readable storage medium may be included in the electronic device described in the above embodiments, or it may exist independently and not assembled into the electronic device.

[0098] Another aspect of this application provides a computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the determination methods provided in the various embodiments described above.

[0099] According to one aspect of the embodiments of this application, a computer system is also provided, including a Central Processing Unit (CPU), which can perform various appropriate actions and processes based on a program stored in read-only memory (ROM) or a program loaded from storage into random access memory (RAM), such as performing the methods described above. Various programs and data required for system operation are also stored in the RAM. The CPU, ROM, and RAM are interconnected via a bus. Input / output (I / O) interfaces are also connected to the bus.

[0100] The following components are connected to the I / O interface: input components including keyboards, mice, etc.; output components including cathode ray tubes (CRTs), liquid crystal displays (LCDs), and speakers; storage components including hard drives; and communication components including network interface cards such as LAN (Local Area Network) cards and modems. The communication components perform communication processing via networks such as the Internet. Drives are also connected to the I / O interface as needed. Removable media, such as disks, optical discs, magneto-optical discs, semiconductor memories, etc., are installed on the drive as needed so that computer programs read from them can be installed into the storage components as required.

[0101] The above description is merely a preferred exemplary embodiment of this application and is not intended to limit the implementation of this application. Those skilled in the art can easily make corresponding modifications or alterations based on the main concept and spirit of this application. Therefore, the scope of protection of this application should be determined by the scope of protection claimed in the claims.

Claims

1. A method for determining the required power of a motor drive, characterized in that, include: Obtain acceleration performance requirements information; The acceleration performance requirement information includes the target acceleration time required for the vehicle to accelerate from zero speed to the target speed. Determine the average drive power required by the motor to meet the corresponding acceleration performance requirements based on the acceleration performance requirement information. Based on the target vehicle speed, the average drive power, the inflection point speed of the motor, the wheel radius of the vehicle, and the overall speed ratio of the transmission system, determine the maximum drive power required by the motor to meet the acceleration performance requirements.

2. The method according to claim 1, characterized in that, Determine the average drive power required for the motor to meet the corresponding acceleration performance requirements based on the acceleration performance requirement information, including: According to the formula The average drive power required for the motor to meet the corresponding acceleration performance requirements is calculated; where, This represents the average drive power. This indicates the target acceleration duration. Indicates the efficiency of the transmission system. Indicates vehicle mass. Represents gravitational acceleration. This represents the rolling resistance coefficient of the wheel. Indicates the target vehicle speed. Indicates the drag coefficient. Indicates the vehicle's frontal area. This represents the vehicle rotation conversion factor.

3. The determining method according to claim 1, characterized in that, Based on the target vehicle speed, the average drive power, the inflection point speed of the motor, the wheel radius of the vehicle, and the overall speed ratio of the transmission system, determine the maximum drive power required by the motor to meet the acceleration performance requirements, including: The initial maximum power demand of the motor is calculated based on the target vehicle speed, the average driving power, the inflection point speed of the motor, the wheel radius of the vehicle, and the overall speed ratio of the transmission system. The initial maximum drive power requirement is corrected to obtain the maximum drive power required for the motor to meet the acceleration performance requirements; the maximum drive power requirement is greater than the initial maximum drive power requirement.

4. The determining method according to claim 3, characterized in that, The initial maximum power requirement of the motor is calculated based on the target vehicle speed, the average drive power, the inflection point speed of the motor, the wheel radius of the vehicle, and the overall speed ratio of the transmission system, including: The time ratio is calculated based on the target vehicle speed, the inflection point speed of the motor, the wheel radius of the vehicle, and the overall speed ratio of the transmission system; wherein, the time ratio is the ratio between the inflection point acceleration time and the target acceleration time, and the inflection point acceleration time is the time required for the motor speed to increase from zero to the inflection point speed; The initial maximum power required for the motor is calculated based on the ratio of the average driving power to the duration.

5. The determining method according to claim 4, characterized in that, The time ratio is calculated based on the target vehicle speed, the inflection point speed of the motor, the wheel radius of the vehicle, and the overall speed ratio of the transmission system, including: According to the formula The time ratio was calculated; among which, This indicates the ratio of the stated durations. This indicates the acceleration duration at the inflection point. This indicates the target acceleration duration. This indicates the inflection point speed of the motor. This indicates the wheel radius of the vehicle. Indicates the target vehicle speed. Indicates the overall speed ratio of the transmission system; Based on the ratio of the average drive power to the duration, the initial maximum drive power requirement of the motor is calculated, including: According to the formula The initial maximum power required for the drive of the motor is calculated; where, This indicates the maximum power required for the initial drive. This represents the average driving power.

6. The determining method according to claim 3, characterized in that, The initial maximum drive demand power is corrected to obtain the maximum drive demand power, including: The maximum power required for initial drive is multiplied by a preset correction factor to obtain the maximum power required for drive of the motor; the preset correction factor is greater than 1.

7. The determining method according to any one of claims 1 to 6, characterized in that, After determining the maximum drive power required for the motor to meet the acceleration performance requirements, the determination method includes: Obtain the actual maximum output power of the selected motor; If the actual maximum output power is greater than or equal to the maximum drive demand power, the candidate motor is determined to meet the requirements. If the actual maximum power is less than the maximum power required for driving, the candidate motor is determined to be unsuitable for the requirements.

8. A device for determining the required power of a motor drive, characterized in that, include: The acquisition module is used to obtain acceleration performance requirement information; The acceleration performance requirement information includes the target acceleration time required for the vehicle to accelerate from zero speed to the target speed. The first determining module is used to determine the average driving power required for the motor to meet the corresponding acceleration performance requirements based on the acceleration performance requirement information. The second determining module is used to determine the maximum driving power required by the motor to meet the acceleration performance requirements based on the target vehicle speed, the average driving power, the inflection point speed of the motor, the wheel radius of the vehicle, and the overall speed ratio of the transmission system.

9. An electronic device, characterized in that, include: processor; A memory for storing one or more programs, which, when executed by a processor, cause the processor to implement the determining method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, It stores computer-readable instructions that, when executed by the computer's processor, cause the computer to perform the determining method as described in any one of claims 1 to 7.

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