A method, device, equipment and medium for determining required torque of new energy vehicles

Abstract

The present application discloses a method, device, equipment and medium for determining the required torque of a new energy vehicle. The present application relates to the field of new energy vehicle technology. The method comprises: determining the maximum wheel-end torque for each calibrated vehicle speed according to the motor external characteristic curve; obtaining the minimum required torque for each calibrated vehicle speed in the current driving mode, and, according to the maximum wheel-end torque for each calibrated vehicle speed, determining the maximum required torque for each calibrated vehicle speed when the accelerator pedal opening is maximum in the current driving mode; determining the uniform speed required torque for each calibrated opening according to the calibrated opening of the accelerator pedal when driving at a uniform speed at each calibrated vehicle speed predetermined in the current driving mode; determining the required torque for each working condition in the current driving mode according to the minimum required torque, the maximum required torque, and the uniform speed required torque. The present technical solution can better set the required torque under various working conditions, makes uniform motion easier to achieve, and can achieve the maximum required torque determined based on the motor external characteristic curve.

Description

Technical Field

[0001] The present disclosure relates to the technical field of new energy vehicles, and in particular to a method, device, equipment and medium for determining required torque of a new energy vehicle. Background Art

[0002] With the development of technology, new energy vehicles have gradually been integrated into the lives of the majority of users.

[0003] Since new energy vehicles (NEVs) have transitioned from engines to electric motors as their power source, traditional accelerator pedal torque calibration methods no longer fully meet their needs. Current calibration methods calculate torque values for maximum and minimum pedal openings based on a selected accelerator pedal position, vehicle speed, and accelerator pedal opening rate. Interpolation is used for all other pedal openings. Under this approach, the driver must depress the pedal at 100% to achieve the maximum requested torque, also known as the motor's characteristic torque. When the accelerator pedal is difficult to reach 100% due to external factors, such as stagnation or a pedal opening range of 99% or less, the requested torque falls short of the motor's characteristic torque. Furthermore, the requested torque for intermediate pedal openings is typically interpolated from the requested torques at 0 and 100% pedal opening. However, in reality, the requested torque at speeds below 60 km / h typically follows a constant torque curve, and the torque variation trend resembles the motor's characteristic torque. This results in NEVs being constantly accelerated at a fixed accelerator pedal position, making it difficult to find a steady-state equilibrium at low speeds. Therefore, there is currently no better solution to solve the problem that the motor's external characteristic torque is difficult to achieve and the vehicle speed is difficult to control. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a method, device, equipment and medium for determining the required torque of a new energy vehicle.

[0005] In a first aspect, the present application provides a method for determining a required torque of a new energy vehicle, the method comprising the following steps:

[0006] The technical solutions provided in the embodiments of this application include:

[0007] Obtaining a motor external characteristic curve of the new energy vehicle, and determining a maximum wheel end torque at each calibrated vehicle speed based on the motor external characteristic curve;

[0008] Obtaining the minimum required torque for each calibrated vehicle speed in the current driving mode, and determining the maximum required torque for each calibrated vehicle speed when the accelerator pedal opening is maximum in the current driving mode based on the maximum wheel end torque at each calibrated vehicle speed;

[0009] Determining the uniform speed required torque for each calibrated opening according to the calibrated opening of the accelerator pedal when the vehicle is traveling at a uniform speed at each calibrated speed predetermined in the current driving mode;

[0010] The required torque for each working condition in the current driving mode is determined according to the minimum required torque, the maximum required torque, and the uniform speed required torque.

[0011] According to the technical solution provided in the embodiment of the present application, determining the maximum wheel end torque at each calibrated vehicle speed based on the motor external characteristic curve includes:

[0012] The maximum motor torque corresponding to the motor speed at each calibrated vehicle speed is determined according to the motor external characteristic curve, and the speed reducer transmission ratio is determined to determine the maximum wheel end torque at each calibrated vehicle speed.

[0013] According to the technical solution provided in the embodiments of the present application, the minimum required torque for each calibrated vehicle speed in the current driving mode is obtained, and based on the maximum wheel-end torque at each calibrated vehicle speed, the maximum required torque for each calibrated vehicle speed when the accelerator pedal opening is maximum in the current driving mode is determined, including:

[0014] Obtaining a mode coefficient of a current driving mode; wherein the mode coefficient is a required torque ratio relationship between the current driving mode and the comfort mode;

[0015] Take 0 as the minimum required torque for each calibrated vehicle speed in the current driving mode;

[0016] The maximum required torque at each calibrated vehicle speed is determined according to the mode coefficient and the maximum wheel end torque at each calibrated vehicle speed.

[0017] According to the technical solution provided in the embodiment of the present application, obtaining the mode coefficient of the current driving mode includes:

[0018] Get the current driving mode;

[0019] Retrieve the corresponding relationship between driving mode and mode coefficient;

[0020] A mode coefficient of the current driving mode is determined according to the current driving mode and the corresponding relationship.

[0021] According to the technical solution provided in the embodiment of the present application, the maximum required torque at each calibrated vehicle speed is determined based on the mode coefficient and the maximum wheel end torque at each calibrated vehicle speed, including:

[0022] The product of the mode coefficient and the maximum wheel end torque at each calibrated vehicle speed is used as the maximum required torque at the current calibrated vehicle speed.

[0023] According to the technical solution provided in the embodiment of the present application, the uniform speed required torque for each calibrated opening is determined based on the calibrated opening of the accelerator pedal when the vehicle is traveling at a uniform speed at each predetermined calibrated speed in the current driving mode, including:

[0024] In response to an operation for setting an association between a calibrated opening of the accelerator pedal and a calibrated vehicle speed, determining a calibrated vehicle speed associated with each of the calibrated openings of the accelerator pedal;

[0025] The uniform speed required torque for each calibrated opening is determined based on the pre-determined loss torque for uniform speed travel at each vehicle speed.

[0026] According to the technical solution provided in the embodiment of the present application, the uniform speed required torque for each calibrated opening is determined based on the predetermined loss torque of uniform speed driving at each vehicle speed, including:

[0027] Obtaining the sliding resistance of the vehicle at each calibrated constant speed; wherein the sliding resistance of the vehicle is determined based on the constant speed, the road friction coefficient, and the wind resistance coefficient;

[0028] The loss torque of uniform speed driving at each calibrated vehicle speed is determined according to the sliding resistance of the entire vehicle and the tire radius of the new energy vehicle, and the loss torque is determined as the uniform speed required torque of the accelerator pedal at each calibrated opening.

[0029] According to the technical solution provided in the embodiment of the present application, the required torque for each working condition in the current driving mode is determined based on the minimum required torque, the maximum required torque, and the uniform speed required torque, including:

[0030] The required torque for each working condition in the current driving mode is determined by using an interpolation method according to the minimum required torque, the maximum required torque, and the uniform speed required torque.

[0031] In a second aspect, the present application provides a device for determining a required torque of a new energy vehicle, comprising:

[0032] A maximum wheel-end torque determination module is used to obtain the motor external characteristic curve of the new energy vehicle and determine the maximum wheel-end torque at each calibrated vehicle speed based on the motor external characteristic curve;

[0033] a first required torque parameter calculation module for obtaining the minimum required torque for each calibrated vehicle speed in the current driving mode, and determining, based on the maximum wheel-end torque at each calibrated vehicle speed, the maximum required torque for each calibrated vehicle speed when the accelerator pedal opening is maximum in the current driving mode;

[0034] a second required torque parameter calculation module for determining a uniform speed required torque for each calibrated opening according to a calibrated opening of the accelerator pedal when the vehicle is traveling at a uniform speed at each predetermined calibrated speed in the current driving mode;

[0035] The required torque determination module is used to determine the required torque of each working condition in the current driving mode according to the minimum required torque, the maximum required torque, and the uniform speed required torque.

[0036] On the third aspect, a terminal device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method for determining the required torque of a new energy vehicle as described above are implemented.

[0037] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program, which, when executed by a processor, implements the steps of the method for determining the required torque of a new energy vehicle as described above.

[0038] The above technical solution of the present application obtains the motor external characteristic curve of the new energy vehicle and determines the maximum wheel end torque for each calibrated vehicle speed based on the motor external characteristic curve; obtains the minimum required torque for each calibrated vehicle speed in the current driving mode, and determines the maximum required torque for each calibrated vehicle speed when the accelerator pedal opening is maximum based on the maximum wheel end torque for each calibrated vehicle speed in the current driving mode; determines the uniform speed required torque for each calibrated opening based on the calibrated accelerator pedal opening when driving at a constant speed at each calibrated vehicle speed predetermined in the current driving mode; and determines the required torque for each operating condition in the current driving mode based on the minimum required torque, the maximum required torque, and the uniform speed required torque. Therefore, by setting the calibrated accelerator pedal opening, the present solution can provide a calibrated value between the maximum required torque and the minimum required torque, and determine the maximum required torque based on the motor external characteristic curve. This solution can better set the required torque under various operating conditions, making uniform speed motion easier to achieve and achieving the maximum required torque determined based on the motor external characteristic curve, thereby solving the problems of the existing method for determining the required torque of new energy vehicles, which is difficult to achieve the motor external characteristic torque and difficult to control the vehicle speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0040] Figure 1 1 is a flow chart of a method for determining required torque of a new energy vehicle provided in Example 1 of the present application;

[0041] Figure 2 This is a structural diagram of a device for determining required torque of a new energy vehicle provided in Example 2 of the present application;

[0042] Figure 3This is a schematic diagram of the structure of the device provided in Example 3 of the present application. DETAILED DESCRIPTION

[0043] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0044] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] Example 1

[0046] This embodiment provides a method for determining the required torque of a new energy vehicle. Figure 1 This is a flow chart of the method for determining the required torque of a new energy vehicle provided in Example 1 of this application. Figure 1 As shown, the method includes the following steps:

[0047] S1. Obtaining a motor external characteristic curve of a new energy vehicle, and determining a maximum wheel end torque at each calibrated vehicle speed based on the motor external characteristic curve;

[0048] This solution can be executed through the vehicle control unit (VCU). It can be understood that the vehicle control unit can be connected to various components of the vehicle through communication cables or wirelessly, or through the vehicle's CAN (Controller Area Network) bus. Based on this connection, it is possible to control various components of the vehicle and collect information on the operating status of each component.

[0049] A motor characteristic curve is a graph that shows the relationship between a motor's output power and its speed. It helps users quickly understand motor performance and better select the right motor model. Motor characteristic curves are generally categorized into three types: rated, maximum, and adjustable. Each curve describes the relationship between a motor's output power and speed under different conditions and serves as a crucial guideline for motor selection.

[0050] Each calibrated vehicle speed can be one or more vehicle speed values. The method of obtaining the vehicle speed value can be determined according to actual needs, or it can be determined according to the calibration standards within the industry. For example, the vehicle speed value can be 5km / h, 10km / h, 15km / h, 20km / h, 25km / h and higher vehicle speed values.

[0051] The maximum wheel end torque can be determined at each calibrated vehicle speed based on the torque curve of the motor's external characteristic curve.

[0052] In this embodiment, optionally, determining the maximum wheel end torque at each calibrated vehicle speed according to the motor external characteristic curve includes:

[0053] The maximum motor torque corresponding to the motor speed at each calibrated vehicle speed is determined according to the motor external characteristic curve, and the speed reducer transmission ratio is determined to determine the maximum wheel end torque at each calibrated vehicle speed.

[0054] For example, the maximum wheel end torque at each vehicle speed can be calculated based on the motor external characteristic curve using the following formula:

[0055] T max，v =i×T max_motor，n ;

[0056] Among them, T max，v is the maximum wheel end torque at vehicle speed v, i is the speed ratio of the reducer, T max_motor，n is the maximum motor torque corresponding to the motor speed n at the vehicle speed.

[0057] Among them, the relationship between vehicle speed and motor speed is:

[0058] V = n × 2πr × 60 / 1000 / i;

[0059] Among them, V is the vehicle speed converted from the motor speed, π is the pi, r is the tire radius of the new energy vehicle, and i is the reducer transmission ratio.

[0060] The above formula can be used to determine the maximum wheel torque at each calibrated vehicle speed based on the motor's external characteristic curve. It should be understood that the maximum wheel torque here refers to the maximum wheel torque achieved when the accelerator pedal is depressed to 100% or another set opening (95%) at the calibrated vehicle speed.

[0061] S2. Obtaining the minimum required torque for each calibrated vehicle speed in the current driving mode, and determining the maximum required torque for each calibrated vehicle speed when the accelerator pedal opening is maximum in the current driving mode based on the maximum wheel end torque at each calibrated vehicle speed;

[0062] In this solution, the current driving mode can be energy-saving mode, comfort mode, sports mode, etc., and more driving modes can be set according to driving needs.

[0063] The minimum required torque at each calibrated vehicle speed may be the required torque obtained when the accelerator pedal opening is 0% at each calibrated vehicle speed. Generally, the minimum required torque at each calibrated vehicle speed may be set to 0.

[0064] The maximum required torque may be the required torque obtained when the accelerator pedal opening is 100% at each calibrated vehicle speed.

[0065] In this embodiment, optionally, obtaining the minimum required torque for each calibrated vehicle speed in the current driving mode, and determining the maximum required torque for each calibrated vehicle speed when the accelerator pedal opening is maximum in the current driving mode based on the maximum wheel end torque at each calibrated vehicle speed, include:

[0066] Obtaining a mode coefficient of a current driving mode; wherein the mode coefficient is a required torque ratio relationship between the current driving mode and the comfort mode;

[0067] Take 0 as the minimum required torque for each calibrated vehicle speed in the current driving mode;

[0068] The maximum required torque at each calibrated vehicle speed is determined according to the mode coefficient and the maximum wheel end torque at each calibrated vehicle speed.

[0069] The mode coefficient may be a fixed value, for example, the mode coefficient of the comfort mode may be 1, the mode coefficient of the energy-saving mode may be a value between 0.7 and 0.9, and the mode coefficient of the sports mode may be a value between 1.1 and 1.25.

[0070] In a feasible embodiment, specifically, determining the maximum required torque for each calibrated vehicle speed based on the mode coefficient and the maximum wheel end torque for each calibrated vehicle speed includes:

[0071] The product of the mode coefficient and the maximum wheel end torque at each calibrated vehicle speed is used as the maximum required torque at the current calibrated vehicle speed.

[0072] For example, generally, the accelerator pedal required torque value at 0% accelerator pedal opening is set to 0. The accelerator pedal required torque at 100% accelerator pedal opening is calculated from the maximum wheel end torque and the mode coefficient A, T v,100 =A*T max，v , where T v,100 The accelerator pedal torque required for 100% accelerator pedal opening, T max，v is the maximum wheel end torque at this speed.

[0073] In a feasible embodiment, obtaining the mode coefficient of the current driving mode includes:

[0074] Get the current driving mode;

[0075] Retrieve the corresponding relationship between driving mode and mode coefficient;

[0076] A mode coefficient of the current driving mode is determined according to the current driving mode and the corresponding relationship.

[0077] For example, the mode coefficient of the comfort mode can be set to 1. In the energy-saving mode, to reduce energy consumption, 0.8 ≤ A < 1 can be taken. In other driving modes, such as the sport mode, to ensure that it is easier to request the maximum torque of the motor, generally 1 < A ≤ 1.2 is taken. The final motor request torque is generally limited by the external characteristic torque of the motor, so it will not cause the actual torque of the motor to be abnormally high. In the comfort mode, the demand torque of the accelerator pedal at 90% opening can be set to be equal to that at 100%, that is, T v90 = T v100 . In the sport mode, the demand torque of the accelerator pedal at 80% and 90% opening can be set to be equal to that at 100%, that is, T v,80 = T v,90 = T v,100 .

[0078] Through such settings in this solution, different power experiences can be obtained in different modes. At the same time, in some driving modes, even when the accelerator pedal opening does not reach 100%, the maximum torque provided by the motor can still be obtained.

[0079] S3. Determine the uniform demand torque at each calibrated opening according to the calibrated opening of the accelerator pedal when driving at a constant speed at each predetermined calibrated vehicle speed in the current driving mode;

[0080] In this solution, the calibrated opening of the accelerator pedal when driving at a constant speed at the calibrated vehicle speed can be jointly determined based on historical experimental values and actual demand values.

[0081] In this solution, since the condition for the vehicle to drive at a constant speed is that the driving torque and the resistance torque should be the same. Therefore, the driving torque can be determined according to the resistance torque under the driving states of the vehicle at different calibrated vehicle speeds. And to ensure the controllability of the vehicle driving by the driver, it can be determined that at a certain calibrated vehicle speed, as long as the accelerator pedal is stepped on to a certain opening, the driving torque and the resistance torque are just the same.

[0082] By setting like this in this solution, the opening of the accelerator pedal required when driving at a constant speed at a certain vehicle speed in the current driving mode can be determined. That is, when the accelerator pedal is stepped on to this calibrated opening, the vehicle can maintain a constant speed corresponding to the calibrated opening at the calibrated vehicle speed.

[0083] In a feasible solution, optionally, determining the uniform demand torque at each calibrated opening according to the calibrated opening of the accelerator pedal when driving at a constant speed at each predetermined calibrated vehicle speed in the current driving mode includes:

[0084] Responding to the associated setting operation of the calibrated opening of the accelerator pedal and the calibrated vehicle speed, determining the calibrated vehicle speed associated when the accelerator pedal is stepped on to each of the calibrated openings;

[0085] The uniform speed required torque for each calibrated opening is determined based on the pre-determined loss torque for uniform speed travel at each vehicle speed.

[0086] In this solution, the accelerator pedal opening for constant speed driving at different vehicle speeds and the torque at the operating point can be determined. The accelerator pedal opening for constant speed driving at different vehicle speeds is determined based on the drivability design goal. Taking the energy-saving mode as an example, it can be designed that a 5% accelerator pedal opening can maintain a constant speed of 20km / h, a 10% accelerator pedal opening can maintain a constant speed of 40km / h, a 15% accelerator pedal opening can maintain a constant speed of 60km / h, a 20% accelerator pedal opening can maintain a constant speed of 80km / h, a 25% accelerator pedal opening can maintain a constant speed of 100km / h, a 30% accelerator pedal opening can maintain a constant speed of 120km / h, and a 40% accelerator pedal opening can maintain a constant speed of 160km / h. In other driving modes, the accelerator pedal opening required for constant speed driving is smaller than that designed for the energy-saving mode. If the pedal opening p is required to allow constant speed driving at speed v, based on the pre-calculated accelerator pedal required torque for constant speed driving, the torque of this point in the accelerator pedal required torque two-dimensional table can be obtained as T v,p =T req,v , where T v,p is the accelerator pedal torque required for vehicle speed v and accelerator pedal opening p, T req,v The accelerator pedal torque required for vehicle speed v is constant speed.

[0087] In this solution, optionally, the uniform speed required torque for each calibrated opening is determined based on the predetermined loss torque of uniform speed running at each vehicle speed, including:

[0088] Obtaining the sliding resistance of the vehicle at each calibrated constant speed; wherein the sliding resistance of the vehicle is determined based on the constant speed, the road friction coefficient, and the wind resistance coefficient;

[0089] The loss torque of uniform speed driving at each calibrated vehicle speed is determined according to the sliding resistance of the entire vehicle and the tire radius of the new energy vehicle, and the loss torque is determined as the uniform speed required torque of the accelerator pedal at each calibrated opening.

[0090] Specifically, the method for calculating the accelerator pedal required torque when the vehicle is traveling at a constant speed at different speeds can be:

[0091] T req，v =F×r;

[0092] Among them, F is the sliding resistance of the vehicle, specifically,

[0093] F=a+b×V+c×V 2 ;

[0094] Among them, a is the constant resistance that is independent of vehicle speed (such as road friction resistance), b is the resistance related to the first-order term of vehicle speed (such as transmission system resistance), and c is the resistance related to the second-order term of vehicle speed (such as wind resistance).

[0095] This solution can achieve control of the accelerator pedal opening during the uniform speed driving of new energy vehicles through such a setting. As a result, the driver can more easily control the accelerator pedal of the vehicle to maintain uniform speed during low-speed driving.

[0096] S4. Determine the required torque for each operating condition in the current driving mode based on the minimum required torque, the maximum required torque, and the uniform speed required torque.

[0097] In this solution, when the minimum required torque, the maximum required torque and the uniform speed required torque are obtained, the required torque under other working conditions can be determined by linear interpolation or nonlinear interpolation.

[0098] In this solution, specifically, determining the required torque for each working condition in the current driving mode based on the minimum required torque, the maximum required torque, and the uniform speed required torque includes:

[0099] The required torque for each working condition in the current driving mode is determined by using an interpolation method according to the minimum required torque, the maximum required torque, and the uniform speed required torque.

[0100] In order to make it easier for people in the technical field to understand, this solution provides the following Table 1 for introduction, but it can be understood that this table is only for explanation and does not make any specific limitation.

[0101] Table 1

[0102]

[0103] Combined with Table 1, it can be determined that at T req,20 , T req,40 , T req,60 , T req,80 , T req,100 , T req,120 , T req,140 , T req,160 As shown in Table 1, when the vehicle speed is 0 km / h and 10 km / h, since the uniform speed required torque is not determined, the minimum required torque and the maximum required torque can be interpolated for different accelerator pedal openings.

[0104] At vehicle speeds of 20 km / h, 40 km / h, and so on, since the constant speed required torque is determined, interpolation can be performed based on the constant speed required torque and the accelerator pedal opening below the calibrated opening for the minimum required torque, and based on the constant speed required torque and the accelerator pedal opening above the calibrated opening for the maximum required torque. In this way, the required torque under all operating conditions can be obtained.

[0105] The technical solution provided in this embodiment obtains the motor external characteristic curve of the new energy vehicle and determines the maximum wheel-end torque for each calibrated vehicle speed based on the motor external characteristic curve; obtains the minimum required torque for each calibrated vehicle speed in the current driving mode, and, based on the maximum wheel-end torque for each calibrated vehicle speed, determines the maximum required torque for each calibrated vehicle speed when the accelerator pedal opening is maximum in the current driving mode; determines the uniform speed required torque for each calibrated opening based on the calibrated opening of the accelerator pedal when driving at a constant speed at each calibrated vehicle speed predetermined in the current driving mode; and determines the required torque for each operating condition in the current driving mode based on the minimum required torque, the maximum required torque, and the uniform speed required torque. Therefore, by setting the calibrated opening of the accelerator pedal, this solution can provide a calibration value between the maximum required torque and the minimum required torque, and determine the maximum required torque based on the motor external characteristic curve. This can better set the required torque under various operating conditions, making it easier to achieve uniform speed movement and achieving the maximum required torque determined based on the motor external characteristic curve.

[0106] Example 2

[0107] Corresponding to Example 1, this embodiment provides a device for determining the required torque of a new energy vehicle. Figure 2 This is a schematic diagram of the structure of the device for determining the required torque of a new energy vehicle provided in Example 2 of this application. Figure 2 As shown, the device includes:

[0108] The maximum wheel end torque determination module 201 is used to obtain the motor external characteristic curve of the new energy vehicle and determine the maximum wheel end torque for each calibrated vehicle speed according to the motor external characteristic curve;

[0109] A first required torque parameter calculation module 202 is configured to obtain the minimum required torque for each calibrated vehicle speed in the current driving mode, and determine the maximum required torque for each calibrated vehicle speed when the accelerator pedal opening is maximum in the current driving mode based on the maximum wheel end torque at each calibrated vehicle speed;

[0110] The second required torque parameter calculation module 203 is configured to determine the uniform speed required torque for each calibrated opening according to the calibrated opening of the accelerator pedal when the vehicle is traveling at a uniform speed at each predetermined calibrated speed in the current driving mode;

[0111] The required torque determination module 204 is configured to determine the required torque for each operating condition in the current driving mode according to the minimum required torque, the maximum required torque, and the uniform speed required torque.

[0112] The technical solution provided in this embodiment obtains the motor external characteristic curve of the new energy vehicle and determines the maximum wheel-end torque for each calibrated vehicle speed based on the motor external characteristic curve; obtains the minimum required torque for each calibrated vehicle speed in the current driving mode, and, based on the maximum wheel-end torque for each calibrated vehicle speed, determines the maximum required torque for each calibrated vehicle speed when the accelerator pedal opening is maximum in the current driving mode; determines the uniform speed required torque for each calibrated opening based on the calibrated opening of the accelerator pedal when driving at a constant speed at each calibrated vehicle speed predetermined in the current driving mode; and determines the required torque for each operating condition in the current driving mode based on the minimum required torque, the maximum required torque, and the uniform speed required torque. Therefore, by setting the calibrated opening of the accelerator pedal, this solution can provide a calibration value between the maximum required torque and the minimum required torque, and determine the maximum required torque based on the motor external characteristic curve. This can better set the required torque under various operating conditions, making it easier to achieve uniform speed movement and achieving the maximum required torque determined based on the motor external characteristic curve.

[0113] The device provided in the embodiment of the present application can implement each process implemented in the above method embodiment, and has corresponding functional modules and beneficial effects. To avoid repetition, they will not be described here.

[0114] Example 3

[0115] This embodiment provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method for determining the required torque of a new energy vehicle as described in any one of the above items are implemented. Figure 3 This is a schematic diagram of the structure of the terminal device provided in Example 3 of this application. Figure 3 As shown, terminal device 300 is, for example, a computer. The computer system includes a central processing unit (CPU) 301, which can perform various appropriate actions and processes according to programs stored in a read-only memory (ROM) 302 or programs loaded from a storage portion into a random access memory (RAM) 303. Various programs and data required for system operation are also stored in RAM 303. CPU 301, ROM 302, and RAM 303 are connected to each other via a bus 304. An input / output (I / O) interface 305 is also connected to bus 304.

[0116] The following components are connected to the I / O interface 305: an input section 306 including a keyboard, a mouse, and the like; an output section including devices such as a cathode ray tube (CRT), a liquid crystal display (LCD), and speakers; a storage section 308 including devices such as a hard disk; and a communication section 309 including a network interface card such as a LAN card or a modem. The communication section 309 performs communication processing via a network such as the Internet. A drive is also connected to the I / O interface 305 as needed. Removable media 311, such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, is installed in the drive 310 as needed, so that computer programs read therefrom can be installed into the storage section 308 as needed.

[0117] In particular, according to an embodiment of the present invention, the process of the method for determining the required torque of a new energy vehicle described in the above embodiment can be implemented as a computer software program. For example, embodiment one of the present invention includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part, and / or installed from a removable medium. When the computer program is executed by the central processing unit (CPU) 301, the above-mentioned functions defined in the device of the present application are executed.

[0118] It should be noted that the computer-readable medium described in the present invention can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media can include, but are not limited to, an electrical connection having one or more conductors, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present invention, 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 the present invention, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. This propagated data signal can take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. Program code embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wireline, optical fiber cable, RF, or any suitable combination thereof.

[0119] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, program segment, or a portion of code, and the above-mentioned module, program segment, or a portion of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0120] The units involved in the embodiments of the present invention may be implemented in software or in hardware, and the units described may also be provided in a processor. The names of these units do not, in some cases, constitute a limitation on the units themselves. The units or modules described may also be provided in a processor, for example, they may be described as: a processor comprising a first generation module, an acquisition module, a search module, a second generation module, and a merging module. The names of these units or modules do not, in some cases, constitute a limitation on the units or modules themselves, for example, the input module may also be described as "an acquisition module for acquiring multiple instances to be detected in the basic table."

[0121] As another aspect, the present application further provides a computer-readable medium, which may be included in the terminal device described in the above embodiments, or may exist independently and not be incorporated into the terminal device. The computer-readable medium carries one or more programs, which, when executed by the terminal device, enable the terminal device to implement the method for determining the required torque of a new energy vehicle as described in the above embodiments.

[0122] It should be noted that although several modules or units of the device for action execution are mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more modules or units described above can be concretized in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided into multiple modules or units to be concretized.

[0123] Furthermore, although the steps of the method of the present disclosure are described in a particular order in the accompanying drawings, this does not require or imply that the steps must be performed in this particular order, or that all steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0124] Through the description of the above embodiments, those skilled in the art can easily understand that the example embodiments described herein can be implemented by software, or by combining software with necessary hardware.

[0125] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. A method for determining the required torque of a new energy vehicle, characterized in that: The method comprises: Obtaining a motor external characteristic curve of the new energy vehicle, and determining a maximum wheel end torque at each calibrated vehicle speed based on the motor external characteristic curve; obtaining a minimum required torque for each calibrated vehicle speed in the current driving mode, and determining, based on the maximum wheel torque at each calibrated vehicle speed, a maximum required torque for each calibrated vehicle speed when the accelerator pedal opening is maximum in the current driving mode; and multiplying a mode coefficient corresponding to the current driving mode by the maximum wheel torque at each calibrated vehicle speed as the maximum required torque for the current calibrated vehicle speed; Determining the uniform speed required torque for each calibrated opening according to the calibrated opening of the accelerator pedal when the vehicle is traveling at a uniform speed at each calibrated speed predetermined in the current driving mode; The required torque for each working condition in the current driving mode is determined according to the minimum required torque, the maximum required torque, and the uniform speed required torque.

2. The method for determining the required torque of a new energy vehicle according to claim 1, characterized in that: Obtaining the minimum required torque for each calibrated vehicle speed in the current driving mode, and determining the maximum required torque for each calibrated vehicle speed when the accelerator pedal opening is maximum in the current driving mode based on the maximum wheel end torque at each calibrated vehicle speed, including: Obtaining a mode coefficient of a current driving mode; wherein the mode coefficient is a required torque ratio relationship between the current driving mode and the comfort mode; Take 0 as the minimum required torque for each calibrated vehicle speed in the current driving mode; The maximum required torque at each calibrated vehicle speed is determined according to the mode coefficient and the maximum wheel end torque at each calibrated vehicle speed.

3. The method for determining the required torque of a new energy vehicle according to claim 2, characterized in that: Get the mode coefficient of the current driving mode, including: Get the current driving mode; Retrieve the corresponding relationship between driving mode and mode coefficient; A mode coefficient of the current driving mode is determined according to the current driving mode and the corresponding relationship.

4. The method for determining the required torque of a new energy vehicle according to claim 1, characterized in that: Based on the calibrated openings of the accelerator pedal at each predetermined calibrated vehicle speed while driving at a constant speed in the current driving mode, the uniform speed required torque at each calibrated opening is determined, including: In response to an operation for setting an association between a calibrated opening of the accelerator pedal and a calibrated vehicle speed, determining a calibrated vehicle speed associated with each of the calibrated openings of the accelerator pedal; The uniform speed required torque for each calibrated opening is determined based on the pre-determined loss torque for uniform speed travel at each vehicle speed.

5. The method for determining the required torque of a new energy vehicle according to claim 4, characterized in that: Based on the pre-determined loss torque of uniform speed driving at each vehicle speed, the uniform speed required torque of each calibrated opening is determined, including: Obtaining the sliding resistance of the vehicle at each calibrated constant speed; wherein the sliding resistance of the vehicle is determined based on the constant speed, the road friction coefficient, and the wind resistance coefficient; The loss torque of uniform speed driving at each calibrated vehicle speed is determined according to the sliding resistance of the entire vehicle and the tire radius of the new energy vehicle, and the loss torque is determined as the uniform speed required torque of the accelerator pedal at each calibrated opening.

6. The method for determining the required torque of a new energy vehicle according to claim 1, characterized in that: Determining the required torque for each operating condition in the current driving mode according to the minimum required torque, the maximum required torque, and the uniform speed required torque includes: The required torque for each working condition in the current driving mode is determined by using an interpolation method according to the minimum required torque, the maximum required torque, and the uniform speed required torque.

7. A device for determining the required torque of a new energy vehicle, characterized in that: The device comprises: A maximum wheel-end torque determination module is used to obtain the motor external characteristic curve of the new energy vehicle and determine the maximum wheel-end torque at each calibrated vehicle speed based on the motor external characteristic curve; a first required torque parameter calculation module configured to obtain a minimum required torque for each calibrated vehicle speed in the current driving mode, and determine, based on the maximum wheel torque at each calibrated vehicle speed, a maximum required torque for each calibrated vehicle speed when the accelerator pedal opening is maximum in the current driving mode; and to determine the maximum required torque for the current calibrated vehicle speed by multiplying a mode coefficient corresponding to the current driving mode by the maximum wheel torque at each calibrated vehicle speed; a second required torque parameter calculation module for determining a uniform speed required torque for each calibrated opening according to a calibrated opening of the accelerator pedal when the vehicle is traveling at a uniform speed at each predetermined calibrated speed in the current driving mode; The required torque determination module is used to determine the required torque of each working condition in the current driving mode according to the minimum required torque, the maximum required torque, and the uniform speed required torque.

8. A terminal device, characterized in that: The terminal device includes: memory for storing programs; and A processor is configured to execute the method for determining the required torque of a new energy vehicle as described in any one of claims 1 to 6 by calling the program stored in the memory.

9. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the method for determining the required torque of a new energy vehicle as described in any one of claims 1-6 is implemented.

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