CN114684143B - Electric vehicle and power-limited control method and system thereof - Google Patents

Abstract

The application discloses an electric vehicle and a power limited control method and a power limited control system thereof, wherein the power limited control method of the electric vehicle comprises the following steps: when the electric vehicle runs on a road with low speed limitation, acquiring the lowest speed limit of the current road, and acquiring gradient information of the current road; obtaining the current maximum discharge power of a power battery, obtaining the current maximum driving power of a motor, and obtaining the current consumption power of a high-voltage accessory of an electric vehicle; calculating the current highest running speed of the electric vehicle according to the gradient information of the current road, the current maximum discharge power of the power battery, the current maximum driving power of the motor and the current consumption power of the high-voltage accessories; and when the current highest running speed of the electric vehicle is smaller than the lowest speed limit of the current road, controlling the out-vehicle prompting device to send out low-speed running prompting information. According to the electric vehicle power limited control method provided by the embodiment of the application, personal license deduction and fine caused by non-human factors of a driver can be avoided.

Description

Electric vehicles and power limited control methods and systems

Technical field

The present invention relates to the field of vehicle technology, and in particular, to an electric vehicle and its power limited control method and system.

Background technique

The motor output power of an electric vehicle is restricted by many factors, such as battery power, battery temperature, motor system temperature, and some vehicle failures. These factors are force majeure and are not human factors.

For example, when the battery power is relatively low, the car's speed will not reach the high value because the battery power is limited. If the vehicle is driving on the highway at this time, some sections of the highway have a minimum driving speed such as 60km/h. At this time, the power of the vehicle is limited and the vehicle speed cannot reach the minimum speed required by traffic regulations, which will result in being photographed by monitoring facilities such as electronic eyes and subject to fines and deductions. However, this is not a human factor on the part of the driver.

However, traffic regulations facilities cannot identify whether the vehicle or human factors cause the vehicle to fail to drive in accordance with traffic regulations, and the driver cannot calculate in real time whether the power of his vehicle meets the minimum speed of the traffic regulations.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an electric vehicle power limited control method to facilitate the transportation department to obtain the true status of the vehicle, which can not only avoid the driver's non-human factors causing personal driver's license points and fines, but also enable the transportation department to Reasonable handling of traffic vehicles can improve the convenience and rationality of traffic control and save time and cost.

The present invention aims to propose a computer-readable storage medium that implements the above method. The present invention aims to propose an electric vehicle that implements the above method. The present invention also aims to propose a power limited control system for an electric vehicle.

The electric vehicle power limited control method according to an embodiment of the present invention includes: when the electric vehicle is driving on a low-speed restricted road, obtaining the minimum speed limit of the current road and obtaining the slope information of the current road; obtaining the current speed of the power battery maximum discharge power, and obtain the current maximum driving power of the motor, and obtain the current power consumption of the high-voltage accessories of the electric vehicle; according to the slope information of the current road, the current maximum discharge power of the power battery, and the The current maximum driving power and the current power consumption of the high-voltage accessory are used to calculate the current maximum operating speed of the electric vehicle; when the current maximum operating speed of the electric vehicle is less than the minimum speed limit of the current road, the external prompt device is controlled Issue a low-speed driving warning message.

According to the electric vehicle power limited control method according to the embodiment of the present invention, the current maximum operating speed of the electric vehicle is calculated based on the slope information of the current road, the current maximum discharge power of the power battery, the current maximum driving power of the motor, and the current power consumption of high-voltage accessories. , and when the current maximum operating speed of the electric vehicle is less than the minimum speed limit of the current road, the vehicle exterior prompt device is controlled to issue a low-speed driving prompt message. This makes it easier for the transportation department to obtain the true status of the vehicle, which can not only avoid the deduction of points and fines on the individual's driver's license caused by the driver's non-human factors, but also enable the transportation department to reasonably deal with the vehicles involved, thereby improving the convenience and convenience of traffic control. Rationality, saving time and cost.

In some embodiments, the current maximum value of the electric vehicle is calculated based on the slope information of the current road, the current maximum discharge power of the power battery, the current maximum driving power of the motor, and the current power consumption of the high-voltage accessory. The running speed includes: calculating the available power based on the current maximum discharge power of the power battery and the current power consumption of the high-voltage accessory, and determining the actual driving available power based on the available power and the current maximum driving power of the motor; The actual driving available power and the current road gradient information are used to calculate the current maximum operating speed of the electric vehicle.

Specifically, the current maximum operating speed of the electric vehicle is calculated according to the following formula:

P _{driver available} =[m*g*f*cos(a)+m*g*sin(a)+Cd*A*Vmax*Vmax/21.15]*Vmax,

Among them, P _{drive available} is the actual drive available power, m is the full vehicle mass value of the electric vehicle, g is 9.8, Cd is the air resistance coefficient of the electric vehicle, a is the slope of the current road, A is the windward area of the electric vehicle, f is the rolling resistance coefficient, and Vmax is the current maximum operating speed of the electric vehicle.

In some optional embodiments, determining the actual driving available power according to the available power and the current maximum driving power of the motor includes: calculating the minimum value of the available power and the current maximum driving power of the motor. to determine the actual driving power available.

In some embodiments, obtaining the minimum speed limit of the current road includes: performing information interaction with the navigation system through the ADAS system to obtain the minimum speed limit of the current road; or collecting roadside speed limit traffic sign information through a vehicle-mounted camera to obtain The minimum speed limit for the current road in question.

In some optional embodiments, when controlling the off-vehicle prompt device to send out low-speed driving prompt information, the current maximum operating speed of the electric vehicle is also sent to the traffic management platform.

In some optional embodiments, the vehicle exterior prompt device is a prompt light provided on the roof of the vehicle.

A computer-readable storage medium according to an embodiment of the present invention has an electric vehicle power limited control program stored thereon. When the electric vehicle power limited control program is executed by a processor, the method described in any of the above embodiments of the present invention is implemented. Power limited control method for electric vehicles.

The computer-readable storage medium according to the embodiment of the present invention enables the transportation department to obtain the true status of the vehicle, which can not only avoid the deduction of points and fines on the individual's driver's license caused by the driver's non-human factors, but also enable the transportation department to reasonably handle the vehicles involved. , which can improve the convenience and rationality of traffic control and save time and cost.

An electric vehicle according to an embodiment of the present invention includes a memory, a processor, and an electric vehicle power limited control program stored in the memory and executable on the processor. When the processor executes the electric vehicle power limited control program , to implement the electric vehicle power limited control method as described in any of the above embodiments of the present invention.

According to the electric vehicle according to the embodiment of the present invention, the current maximum operating speed of the electric vehicle is calculated based on the slope information of the current road, the current maximum discharge power of the power battery, the current maximum driving power of the motor, and the current power consumption of high-voltage accessories, and is calculated when the electric vehicle When the current maximum operating speed is less than the minimum speed limit of the current road, the vehicle exterior prompt device is controlled to issue a low-speed driving prompt message. This makes it easier for the transportation department to obtain the true status of the vehicle, which can not only avoid the deduction of points and fines on the individual's driver's license caused by the driver's non-human factors, but also enable the transportation department to reasonably deal with the vehicles involved, thereby improving the convenience and convenience of traffic control. Rationality, saving time and cost.

An electric vehicle power limited control system according to an embodiment of the present invention includes: a battery manager for detecting the current maximum discharge power of the power battery; a motor controller for detecting the current maximum driving power of the motor; and a vehicle body stability system controller. , used to detect the slope information of the current road; an intelligent assisted driving system controller, used to obtain the minimum speed limit of the current road; an external prompt device; a vehicle controller, which is connected to the battery manager respectively , the motor controller, the vehicle body stabilization system controller, the intelligent auxiliary driving system controller and the vehicle exterior prompt device are connected, and the vehicle controller is used when the electric vehicle is driving on a low-speed restricted road. The current power consumption of the high-voltage accessories of the electric vehicle is obtained at the same time, and calculated based on the slope information of the current road, the current maximum discharge power of the power battery, the current maximum driving power of the motor, and the current power consumption of the high-voltage accessories. The current maximum operating speed of the electric vehicle, and when the current maximum operating speed of the electric vehicle is less than the minimum speed limit of the current road, the external prompt device is controlled to send out low-speed driving prompt information.

According to the electric vehicle power limited control system of the embodiment of the present invention, the current maximum operating speed of the electric vehicle is calculated based on the slope information of the current road, the current maximum discharge power of the power battery, the current maximum driving power of the motor, and the current power consumption of high-voltage accessories. , and when the current maximum operating speed of the electric vehicle is less than the minimum speed limit of the current road, the vehicle exterior prompt device is controlled to issue a low-speed driving prompt message. This makes it easier for the transportation department to obtain the true status of the vehicle, which can not only avoid the deduction of points and fines on the individual's driver's license caused by the driver's non-human factors, but also enable the transportation department to reasonably deal with the vehicles involved, thereby improving the convenience and convenience of traffic control. Rationality, saving time and cost. In addition, using the vehicle controller's ability to calculate the maximum vehicle speed can also prevent drivers from lighting warning lights privately and taking advantage of opportunities.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of the drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

Figure 1 is a flow chart of an electric vehicle power limited control method in an embodiment of the present invention;

Figure 2 is a schematic structural diagram of an electric vehicle and a traffic detection device in an embodiment of the present invention;

Figure 3 is a block schematic diagram of an electric vehicle power limited control method in an embodiment of the present invention.

Reference signs:

Electric vehicles 1000,

Battery manager 100, motor controller 200, body stability system controller 300, intelligent assisted driving system controller 400, vehicle exterior prompt device 500, vehicle controller 600, high voltage accessories 700,

Traffic detection device 2000.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and cannot be understood as limiting the present invention.

The following describes an electric vehicle power limited control method according to an embodiment of the present invention with reference to FIGS. 1-2 .

An electric vehicle power limited control method according to an embodiment of the present invention includes:

S11, when the electric vehicle 1000 is driving on a low-speed restricted road, obtain the minimum speed limit of the current road and obtain the slope information of the current road;

S12, obtain the current maximum discharge power of the power battery, obtain the current maximum driving power of the motor, and obtain the current power consumption of the high-voltage accessories of the electric vehicle 1000;

S13, calculate the current maximum operating speed of the electric vehicle 1000 based on the current slope information of the road, the current maximum discharge power of the power battery, the current maximum driving power of the motor, and the current power consumption of the high-voltage accessories;

S14: When the current maximum operating speed of the electric vehicle 1000 is less than the minimum speed limit of the current road, control the vehicle exterior prompt device 500 to send out low-speed driving prompt information.

It can be understood that the present invention provides a power limited control method for electric vehicles, which mainly solves the problem of non-human factors causing the vehicle to fail to meet the minimum driving speed required by urban expressways or highways, resulting in fines and deductions.

For example, the electric vehicle 1000 can intelligently calculate the maximum operating speed that the vehicle can reach on a low-speed restricted road. When the vehicle calculates that the maximum speed of the vehicle is less than the minimum speed limit of the current road, that is, it does not meet the traffic regulations, the external prompt device 500 sends out a low-speed driving prompt message, indicating that the current situation is caused by the vehicle's driving ability. In this way, traffic detection devices 2000 such as traffic electronic eyes can use the external prompt device 500 to penalize the vehicle, which can avoid traffic violations caused by the driver's non-human factors. The embarrassment of regulations can avoid the driver's personal driver's license points and fines, and also facilitate the transportation department to obtain the true status of the vehicle and reasonably deal with the vehicle involved.

In addition, the off-vehicle reminder device sends out a low-speed driving reminder message when the current maximum operating speed of the electric vehicle 1000 is less than the minimum speed limit of the current road, which can also prevent the driver from lighting the warning light privately and facilitate traffic control.

This solves the problem of non-human factors in electric vehicles currently on the market that cause the vehicle speed to fail to meet the requirements of traffic regulations; it is more reasonable and safe whether the vehicle's irregular driving behavior is a human factor or a vehicle factor.

According to the electric vehicle power limited control method according to the embodiment of the present invention, the current maximum operation of the electric vehicle 1000 is calculated through the slope information of the current road, the current maximum discharge power of the power battery, the current maximum driving power of the motor, and the current power consumption of high-voltage accessories. speed, and when the current maximum operating speed of the electric vehicle 1000 is less than the minimum speed limit of the current road, the vehicle exterior prompt device 500 is controlled to issue a low-speed driving prompt message. This makes it easier for the transportation department to obtain the true status of the vehicle, which can not only avoid the deduction of points and fines on the individual's driver's license caused by the driver's non-human factors, but also enable the transportation department to reasonably deal with the vehicles involved, thereby improving the convenience and convenience of traffic control. Rationality, saving time and cost.

In some embodiments, calculating the current maximum operating speed of the electric vehicle 1000 based on the current slope information of the road, the current maximum discharge power of the power battery, the current maximum driving power of the motor, and the current power consumption of the high-voltage accessories includes: The current maximum discharge power and the current power consumption of high-voltage accessories are used to calculate the available power, and the actual driving available power is determined based on the available power and the current maximum driving power of the motor; the current maximum driving power of the electric vehicle 1000 is calculated based on the actual driving available power and the slope information of the current road. Running speed. Therefore, by calculating the available power through the current maximum discharge power of the power battery and the current power consumption of high-voltage accessories, the power that can be used to drive the vehicle from the battery level can be calculated. By determining the actual driving power available by the available power and the current maximum driving power of the motor, the actual power value that can be used to drive the vehicle can be determined after integrating the battery and motor systems of the vehicle. thus. This can make the calculated maximum operating speed more realistic and accurate.

Specifically, the current maximum operating speed of the electric vehicle 1000 is calculated according to the following formula:

P _{driver available} =[m*g*f*cos(a)+m*g*sin(a)+Cd*A*Vmax*Vmax/21.15]*Vmax,

Among them, P _{drive available} is the actual driving power available, m is the full vehicle mass value of the electric vehicle 1000, g is 9.8, Cd is the air resistance coefficient of the electric vehicle 1000, a is the slope of the current road, and A is the windward direction of the electric vehicle 1000 area, f is the rolling resistance coefficient, and Vmax is the current maximum operating speed of the electric vehicle 1000. From this, the maximum speed that the vehicle can reach in the current state can be found.

It should be noted that vehicles will undergo wind tunnel testing before mass production. There are many ways to determine the value of the rolling resistance coefficient. It can be a value that changes according to the vehicle speed, or it can be a fixed value. Vehicles will be tested before leaving the factory.

In some optional embodiments, determining the actual driving available power based on the available power and the current maximum driving power of the motor includes: performing a minimum calculation of the available power and the current maximum driving power of the motor to determine the actual driving available power. It is understandable that sometimes the battery output driving power is sufficient, but the motor system will also reduce the power output due to motor overheating or motor system failure. Therefore, the available power and the current maximum driving power of the motor are calculated by taking the smaller value. Determining the actual power available for driving can provide a more realistic and accurate power value for driving.

In some embodiments, obtaining the minimum speed limit of the current road includes: performing information interaction with the navigation system through the ADAS system to obtain the minimum speed limit of the current road; or collecting roadside speed limit traffic sign information through a vehicle-mounted camera to obtain the current road the minimum speed limit. As a result, the minimum speed limit of the current road can be obtained in real time, and a true and reliable minimum speed requirement value can also be obtained.

In some optional embodiments, when controlling the vehicle exterior prompt device 500 to issue low-speed driving prompt information, the current maximum operating speed of the electric vehicle 1000 is also sent to the traffic management platform. As a result, the traffic department can easily obtain the true status of the vehicle, and can also enable the traffic management platform to record information in real time, allowing the transportation department to reasonably handle the vehicles involved, thereby improving the convenience and rationality of traffic control and saving time and costs. .

In some optional embodiments, the vehicle exterior warning device 500 is a warning light arranged on the roof of the vehicle. This is used to warn the traffic detection device 2000 that the vehicle speed cannot meet the requirements due to non-human factors.

Optionally, the warning light can be red, alarming, with a larger wavelength and a longer propagation distance. It can be in a form uniformly stipulated by the transportation department. Of course, the warning light can also be yellow or other colors. The specific form of the reminder light is not limited here.

A computer-readable storage medium according to an embodiment of the present invention has a power limited control program for an electric vehicle 1000 stored thereon. When the power limited control program for an electric vehicle 1000 is executed by a processor, the power limited control program for the electric vehicle 1000 can be implemented as described in any of the above embodiments of the present invention. The electric vehicle power limited control method described above.

The computer-readable storage medium according to the embodiment of the present invention enables the transportation department to obtain the true status of the vehicle, which can not only avoid the deduction of points and fines on the individual's driver's license caused by the driver's non-human factors, but also enable the transportation department to reasonably handle the vehicles involved. , which can improve the convenience and rationality of traffic control and save time and cost.

The electric vehicle 1000 according to the embodiment of the present invention includes a memory, a processor, and a power limited control program for the electric vehicle 1000 that is stored in the memory and can be run on the processor. When the processor executes the power limited control program for the electric vehicle 1000, Implement the electric vehicle power limited control method as described in any of the above embodiments of the present invention.

According to the electric vehicle 1000 according to the embodiment of the present invention, the current maximum operating speed of the electric vehicle 1000 is calculated based on the slope information of the current road, the current maximum discharge power of the power battery, the current maximum driving power of the motor, and the current power consumption of high-voltage accessories, and When the current maximum operating speed of the electric vehicle 1000 is less than the minimum speed limit of the current road, the vehicle exterior prompt device 500 is controlled to issue a low-speed driving prompt message. This makes it easier for the transportation department to obtain the true status of the vehicle, which can not only avoid the deduction of points and fines on the individual's driver's license caused by the driver's non-human factors, but also enable the transportation department to reasonably deal with the vehicles involved, thereby improving the convenience and convenience of traffic control. Rationality, saving time and cost.

The electric vehicle power limited control system according to an embodiment of the present invention, as shown in Figure 3, includes: a battery manager 100, a motor controller 200, a vehicle body stabilization system controller 300, an intelligent assisted driving system controller 400, and an exterior prompt. device 500 and vehicle controller 600. The battery manager 100 is used to detect the current maximum discharge power of the power battery, the motor controller 200 is used to detect the current maximum driving power of the motor, and the vehicle body stability system controller 300 is used to detect the slope information of the current road. The intelligent assisted driving system controller 400 is used to obtain the minimum speed limit of the current road. The vehicle controller 600 is connected to the battery manager 100, the motor controller 200, the body stability system controller 300, the intelligent assisted driving system controller 400 and the vehicle exterior prompt device 500 respectively. The vehicle controller 600 is used to operate the electric vehicle 1000 When driving on a low-speed restricted road, the current power consumption of the high-voltage accessory 700 of the electric vehicle 1000 is obtained, and based on the slope information of the current road, the current maximum discharge power of the power battery, the current maximum driving power of the motor, and the current power of the high-voltage accessory 700 The power consumption is calculated to calculate the current maximum operating speed of the electric vehicle 1000, and when the current maximum operating speed of the electric vehicle 1000 is less than the minimum speed limit of the current road, the vehicle exterior prompt device 500 is controlled to issue a low-speed driving prompt message.

According to the electric vehicle power limited control system according to the embodiment of the present invention, the current maximum operation of the electric vehicle 1000 is calculated through the slope information of the current road, the current maximum discharge power of the power battery, the current maximum driving power of the motor, and the current power consumption of high-voltage accessories. speed, and when the current maximum operating speed of the electric vehicle 1000 is less than the minimum speed limit of the current road, the vehicle exterior prompt device 500 is controlled to issue a low-speed driving prompt message. This makes it easier for the transportation department to obtain the true status of the vehicle, which can not only avoid the deduction of points and fines on the individual's driver's license caused by the driver's non-human factors, but also enable the transportation department to reasonably deal with the vehicles involved, thereby improving the convenience and convenience of traffic control. Rationality, saving time and cost. In addition, using the vehicle controller 600's ability to calculate the maximum vehicle speed can also prevent the driver from lighting the warning light privately and taking advantage of the situation.

Optionally, the high-voltage accessories 700 may include a DC converter, an air conditioning compressor, and a PTC heating system, which all consume power from the battery system and report their real-time power consumption to the vehicle controller 600 through the CAN signal in real time.

Optionally, information interaction between the vehicle controller 600, the battery manager 100, the motor controller 200, the vehicle body stability system controller 300, and the intelligent auxiliary driving system controller 400 is performed through a CAN line.

Optionally, the vehicle controller 600 is connected to the vehicle exterior prompt device 500 using hard wires, and the vehicle controller 600 directly controls the drive to turn on and off the indicator light.

Those skilled in the art will understand that embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment that combines software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each process and/or block in the flowchart illustrations and/or block diagrams, and combinations of processes and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device produce a use A device for realizing the functions specified in one process or multiple processes of the flowchart and/or one block or multiple blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory that causes a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction means, the instructions The device implements the functions specified in a process or processes of the flowchart and/or a block or blocks of the block diagram.

These computer program instructions may also be loaded onto a computer or other programmable data processing device, causing a series of operating steps to be performed on the computer or other programmable device to produce computer-implemented processing, thereby executing on the computer or other programmable device. Instructions provide steps for implementing the functions specified in a process or processes of a flowchart diagram and/or a block or blocks of a block diagram.

It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps other than those listed in a claim. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The application may be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In the element claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, third, etc. does not indicate any order. These words can be interpreted as names.

Although the preferred embodiments of the present application have been described, those skilled in the art will be able to make additional changes and modifications to these embodiments once the basic inventive concepts are understood. Therefore, it is intended that the appended claims be construed to include the preferred embodiments and all changes and modifications that fall within the scope of this application.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and equivalent technologies, the present application is also intended to include these modifications and variations.

Claims (10)

1. A power limited control method for electric vehicles, characterized by comprising: When an electric vehicle is driving on a low-speed restricted road, obtain the minimum speed limit of the current road and obtain the slope information of the current road; Obtain the current maximum discharge power of the power battery, obtain the current maximum driving power of the motor, and obtain the current power consumption of the high-voltage accessories of the electric vehicle; Calculate the current maximum operating speed of the electric vehicle based on the slope information of the current road, the current maximum discharge power of the power battery, the current maximum driving power of the motor, and the current power consumption of the high-voltage accessory; When the current maximum operating speed of the electric vehicle is less than the minimum speed limit of the current road, the vehicle exterior prompt device is controlled to send out low-speed driving prompt information. 2. The electric vehicle power limited control method according to claim 1, characterized in that, according to the slope information of the current road, the current maximum discharge power of the power battery, the current maximum driving power of the motor and the The current power consumption of the high-voltage accessories is used to calculate the current maximum operating speed of the electric vehicle, including: Calculate the available power based on the current maximum discharge power of the power battery and the current power consumption of the high-voltage accessory, and determine the actual driving available power based on the available power and the current maximum driving power of the motor; The current maximum operating speed of the electric vehicle is calculated based on the actual driving available power and the current slope information of the road. 3. The electric vehicle power limited control method according to claim 2, characterized in that the current maximum operating speed of the electric vehicle is calculated according to the following formula: P _{driver available} =[m*g*f*cos(a)+m*g*sin(a)+Cd*A*Vmax*Vmax/21.15]*Vmax, Among them, P _{drive available} is the actual drive available power, m is the full vehicle mass value of the electric vehicle, g is 9.8, Cd is the air resistance coefficient of the electric vehicle, a is the slope of the current road, A is the windward area of the electric vehicle, f is the rolling resistance coefficient, and Vmax is the current maximum operating speed of the electric vehicle. 4. The electric vehicle power limited control method according to claim 2, characterized in that determining the actual driving available power according to the available power and the current maximum driving power of the motor includes: The minimum value of the available power and the current maximum driving power of the motor is calculated to determine the actual driving available power. 5. The electric vehicle power limited control method according to any one of claims 1 to 4, characterized in that obtaining the minimum speed limit of the current road includes: Interact information with the navigation system through the ADAS system to obtain the minimum speed limit of the current road; or The vehicle-mounted camera collects roadside speed limit traffic sign information to obtain the minimum speed limit of the current road. 6. The electric vehicle power limited control method according to any one of claims 1 to 4, characterized in that when controlling the vehicle exterior prompt device to send out low-speed driving prompt information, the current power of the electric vehicle is also controlled. The maximum operating speed is sent to the traffic management platform. 7. The electric vehicle power limited control method according to any one of claims 1 to 4, characterized in that the vehicle exterior prompt device is a prompt light installed on the roof of the vehicle. 8. A computer-readable storage medium, characterized in that an electric vehicle power limited control program is stored thereon. When the electric vehicle power limited control program is executed by a processor, the electric vehicle power limited control program implements any one of claims 1-7. The power limited control method of electric vehicles. 9. An electric vehicle, characterized in that it includes a memory, a processor, and an electric vehicle power limited control program stored in the memory and executable on the processor, and the processor executes the electric vehicle power limited control. When executing the program, the electric vehicle power limited control method as described in any one of claims 1-7 is implemented. 10. An electric vehicle power limited control system, characterized in that it includes: Battery manager, used to detect the current maximum discharge power of the power battery; Motor controller, used to detect the current maximum driving power of the motor; Body stability system controller, used to detect the slope information of the current road; Intelligent assisted driving system controller, used to obtain the minimum speed limit of the current road; Exterior reminder device; A vehicle controller, which is connected to the battery manager, the motor controller, the body stability system controller, the intelligent auxiliary driving system controller and the vehicle exterior prompt device respectively, The vehicle controller is used to obtain the current power consumption of the high-voltage accessories of the electric vehicle when the electric vehicle is traveling on a low-speed restricted road, and based on the slope information of the current road, the current maximum discharge power of the power battery, The current maximum driving power of the motor and the current power consumption of the high-voltage accessory are used to calculate the current maximum operating speed of the electric vehicle, and control is performed when the current maximum operating speed of the electric vehicle is less than the minimum speed limit of the current road. The vehicle exterior prompt device sends out low-speed driving prompt information.