Method and system for recovering braking energy of electric vehicle

Abstract

The invention relates to the technical field of electric automobiles, in particular to an electric automobile braking energy recovery method and system, and the system comprises a monitoring module which is used for monitoring an automobile driving scene in real time, and capturing automobile driving information in the automobile driving scene; the analysis module is used for receiving the automobile driving information captured in the monitoring module and analyzing whether the automobile driving scene meets the energy recovery condition or not based on the automobile driving information; the method mainly serves an existing mature automobile brake energy recovery technology, provides control service in an actual application scene for application of the automobile brake energy recovery technology, ensures that automobile brake energy recovery operation can be applied in a reasonable state, and ensures that the automobile brake energy recovery operation can be carried out in a reasonable state every time the automobile executes brake energy recovery. The brake energy recovery benefit is higher, and the problems that the automobile brake energy recovery operation is switched frequently, and the automobile brake energy recovery benefit is low are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and particularly to a method and system for recovering braking energy of an electric vehicle. Background Art

[0002] The recovery of braking energy of electric vehicles is an important technology. When the vehicle brakes, the motor switches to the generator mode, converting the kinetic energy of the vehicle into electrical energy and storing it back into the battery. This can not only improve the energy utilization rate and increase the driving range, but also reduce the wear of brake pads. It is one of the key technologies for electric vehicles to achieve energy conservation, environmental protection and performance improvement.

[0003] A method for collecting data of an electric vehicle braking energy recovery system is disclosed in the invention patent with the application number 201410634914.3. This method establishes a communication connection between the data collection system and each data generation device, and the data collection system collects data from each data generation device through the communication connection. The method includes the following steps: Step 1, the upper computer data collection system initializes the output current of the motor bus, the voltage at the supercapacitor terminal, the rotational speed of the electric vehicle wheels, and the duty cycle signal of the DC-DC circuit; Step 2, the upper computer data collection system scans the communication interface. After the communication interface is successfully connected, the received data and the transmitted data can be collected in an interrupt manner; Step 3, the upper computer data collection system caches the data in a temporary space before collecting the data; Step 4, determine whether there are interfering data in the data cached in the automatic dynamic monitoring buffer space of the upper computer data collection system. If so, actively delete the interfering data; Step 5, after removing the interfering data, calculate whether the length of the data in the computer buffer is an integer multiple of the length of a set of data transmitted by the lower computer. If it is not an integer multiple, the collection system will actively delete the non-integer multiple data; Step 6, after the data in the buffer meets the above conditions, the data collection system will sequentially take out a set of data with the length of the data transmitted by the lower computer from the buffer for the second data caching; Step 7, after processing the interfering data and performing shielding filtering, the collection system stores the data that truly meets the experimental requirements in the computer. While storing the data, the data is docked with the image processing technology to realize the waveform display of the data; Step 8, the finally stored data can be docked with the image processing technology again after the experiment is over to realize the waveform display of the data again, or it can be exported in TXT format for the processing of other software; Step 9, while receiving the data, the data collection system can send data instructions to the lower computer under the control of the user to realize the test and control of the lower computer hardware system.

[0004] This application aims to solve the following problems: "Currently, there are mainly five solutions for collecting and storing the braking energy recovery data of electric vehicles: The first solution is that the interface of the data acquisition system is single: it can only collect data from interfaces of a certain type of lower-level computer and is not applicable to communication interfaces of multiple types of lower-level computers. The second solution is to collect and store at equal time intervals: the data acquisition system simply collects real-time data at regular intervals and saves all these data. The third solution is to collect at equal time intervals but only store data exceeding a certain threshold: this solution improves the second solution. After the data acquisition system collects real-time data at regular intervals, it simply analyzes these data without performing shielding and filtering processing. The fourth solution is to collect data in the form of data interruption, but without identifying the ID numbers of the data: this solution improves the second and third solutions, but each group of data does not have its own ID number, which may lead to the inclusion of data unrelated to the experiment. The fifth solution is the complexity of the data acquisition system: the traditional acquisition system is compiled through C++ and can only run in the VC++ editing environment. Not only is the software operating environment harsh, but the program is also complex, rigid, and prone to errors, without a visual effect."

[0005] However, most of the existing technologies focus on optimizing the braking energy recovery ability of vehicles and do not take the effective determination of the braking energy recovery scenario of vehicles as the main research and development direction, resulting in the current braking energy recovery actions of vehicles often being decided based on the vehicle's own state parameters. Therefore, it is difficult to ensure the efficiency of the braking energy recovery of vehicles.

[0006] Therefore, an electric vehicle braking energy recovery system is proposed. Summary of the Invention

[0007] In view of the above-mentioned drawbacks of the existing technology, the present invention provides a method and system for braking energy recovery of electric vehicles, which solves the technical problems raised in the above background technology.

[0008] To achieve the above objectives, the present invention is realized through the following technical solutions: In a first aspect, an electric vehicle braking energy recovery system includes: Monitoring module, used to monitor the driving scenario of the vehicle in real time and capture vehicle driving information in the driving scenario of the vehicle; Analysis module, used to receive the vehicle driving information captured in the monitoring module and analyze whether the vehicle driving scenario meets the energy recovery condition based on the vehicle driving information; Decision-making module, used to set the trigger interval for vehicle braking energy recovery, receive the analysis result of whether the vehicle driving scenario meets the energy recovery condition in the analysis module, and compare it with the vehicle braking energy recovery trigger interval based on the analysis result to decide whether the vehicle performs braking energy recovery; Refresh module, used to monitor the stepping action of the vehicle's accelerator pedal in the situation of the vehicle performing braking energy recovery, and refresh the system operation when the target speed of stepping on the accelerator pedal exceeds the current vehicle speed; Switching module, used to monitor the operation frequency of stepping on the accelerator pedal to control the acceleration of the vehicle when the vehicle enters the braking energy recovery state on the road section where the vehicle driving information is sourced, set the switching decision threshold, and modify the operation decision result of the decision-making module to no when the operation frequency reaches or exceeds the switching decision threshold; Message module, used to generate a vehicle braking energy recovery control message; Among them, the content of the vehicle braking energy recovery control message generated by the operation of the message module includes: braking energy recovery amount, braking energy recovery state duration, number of braking energy recovery actions on the same road section; The monitoring module is connected to the analysis module through wireless network interaction. The lower level of the analysis module is connected to a receiving unit and a control unit through wireless network interaction. The receiving unit is connected to the monitoring module through wireless network interaction. The analysis module is connected to the decision-making module through wireless network interaction. Inside the decision-making module, there is a reset unit connected through wireless network interaction. The reset unit is connected to the monitoring module through wireless network. The decision-making module is connected to the refresh module, the switching module, and the message module through wireless network.

[0009] Furthermore, the driving scenario of the vehicle monitored in real time by the monitoring module is sourced from the in-vehicle navigation system. The vehicle driving information includes: vehicle driving road information, vehicle state information. The vehicle state information includes: vehicle speed, braking pedal depression depth, accelerator pedal depression depth. The vehicle driving road information includes: slope, curvature, length, speed limit information of the road section where the vehicle is currently located; Among them, during the operation stage of the monitoring module, the vehicle's own position information is synchronously monitored. The road section between the end point of the road section where the vehicle is currently located and the vehicle's own position information is intercepted based on the vehicle's own position information, and the intercepted road section is used as the monitoring target of the vehicle driving road information.

[0010] Furthermore, the lower level of the analysis module is provided with sub-modules, including: Receiving unit, used to access the monitoring module and receive vehicle driving road information or vehicle state information in the monitoring module; The control unit is used to monitor the operating state of the receiving unit and control the continuous operation of the analysis module based on the operating state of the receiving unit; Among them, the receiving unit runs continuously twice during the operation stage to respectively receive the vehicle driving road information and the vehicle state information. After each time the receiving unit completes the reception of the vehicle driving road information or the vehicle state information, it synchronously forwards it to the analysis module. The analysis module is triggered to run to analyze whether the vehicle driving scenario meets the energy recovery condition based on the vehicle driving road information and the vehicle state information respectively. After the analysis is completed, the control unit controls the analysis module to run again to comprehensively analyze whether the vehicle driving scenario meets the energy recovery condition based on the results of the previous two analyses.

[0011] Furthermore, the analysis logic for whether the vehicle driving scenario in the analysis module meets the energy recovery condition is expressed as: ; In the formula: is the determination value for whether the vehicle driving scenario meets the energy recovery condition at the vehicle state information level; is the comprehensive judgment coefficient; is the vehicle speed; is the minimum vehicle speed threshold allowed for energy recovery; , are the accelerator pedal depression depth and the brake pedal depression depth; is the remaining battery capacity of the vehicle; is the maximum battery storage capacity of the vehicle; is the maximum temperature threshold allowed for the motor to work; is the motor temperature; Among them, all the application parameters in the above formula are vehicle state information, and the comprehensive judgment coefficient is user-defined by the system end user. The value of the comprehensive judgment coefficient is in the range of [0.5, 2]. The higher the vehicle energy recovery ability, the larger the comprehensive judgment coefficient , and vice versa, the smaller the comprehensive judgment coefficient . The values of the accelerator pedal depression depth and the brake pedal depression depth are both 0 to 1. When the accelerator pedal or the brake pedal is fully depressed , takes the value of 1. When the accelerator pedal or the brake pedal is not depressed , takes the value of 0. is the unit step function, .

[0012] Furthermore, the analysis logic for whether the vehicle driving scenario in the analysis module meets the energy recovery condition is expressed as: ; In the formula: is the determination value of whether the vehicle driving scenario meets the energy recovery condition at the vehicle driving road information level; is the comprehensive judgment coefficient; is the maximum slope that the vehicle design allows for braking energy recovery; is the road section slope; is the road section curvature; is the remaining length of the road section where the current vehicle is located; is the total length of the road section; is the current vehicle speed; is the speed limit of the current road section; Among them, the value range of the comprehensive judgment coefficient is within [0.5, 2], the larger it is, the larger the value is, and vice versa, the smaller the value is.

[0013] Furthermore, the analysis logic of whether the vehicle driving scenario meets the energy recovery condition in the analysis module is expressed as: ; In the formula; is the determination value of whether the vehicle driving scenario meets the energy recovery condition; is the weight; Among them, the determination value of whether the vehicle driving scenario meets the energy recovery condition is calculated by the control unit to control the third operation of the analysis module.

[0014] Furthermore, the triggering interval of the vehicle braking energy recovery in the determination module is user-defined by the system end. The determination module is internally provided with sub-modules, including: A reset unit, used to monitor the real-time position of the vehicle and decide whether to reset the system operation based on the real-time position of the vehicle; Among them, when the reset unit runs and monitors that the real-time position of the vehicle leaves the source road section where the current system runs to capture vehicle driving information, it decides to trigger the system to reset the operation. Conversely, the reset unit refreshes the operation.

[0015] Furthermore, the switching determination threshold in the switching module is user-defined by the system end. Based on the comparison result of the operation frequency and the switching determination threshold, after modifying the operation decision result of the determination module, the system operation state is the same as the control result of the system when the decision result of the reset unit is yes.

[0016] In the second aspect, an electric vehicle braking energy recovery method includes: Capturing vehicle driving information in the vehicle driving scenario; Analyze whether the driving scenario of the vehicle meets the conditions for regenerative braking energy according to the vehicle driving information; If the analysis result is no, monitor whether the vehicle has left the section where the captured vehicle driving information is sourced. When the monitoring result is yes, refresh the step execution; otherwise, refresh the monitoring operation; If the analysis result is yes, control the vehicle to perform regenerative braking energy operation on the section where the captured vehicle driving information is sourced; In the scenario where the vehicle performs regenerative braking energy, monitor the stepping action of the vehicle's accelerator pedal. When the target vehicle speed of the accelerator pedal stepping exceeds the current vehicle speed, end the regenerative braking energy operation; Monitor the operation frequency of accelerating the vehicle by stepping on the accelerator pedal in the state of the vehicle's regenerative braking energy recovery. Set a switching determination threshold. When the operation frequency reaches or exceeds the switching determination threshold, end the regenerative braking energy operation; The generation stage of the control message for the vehicle's regenerative braking energy recovery.

[0017] Adopting the technical solution provided by the present invention, compared with the known public technology, it has the following beneficial effects: The present invention provides a method and system for regenerative braking energy recovery of an electric vehicle. This system mainly serves the existing mature regenerative braking energy recovery technology of vehicles, which brings control services in actual application scenarios for the application of regenerative braking energy recovery technology of vehicles, ensures that the regenerative braking energy recovery operation of the vehicle can be applied under reasonable conditions, ensures that the regenerative braking energy recovery benefit is higher each time the vehicle performs regenerative braking energy recovery, avoids the problems of frequent switching of the regenerative braking energy recovery operation of the vehicle and low regenerative braking energy recovery benefit, and comprehensively considers the vehicle's own state and the road conditions of the section where the vehicle is located to make a decision on whether to perform regenerative braking energy recovery of the vehicle during the decision-making stage of the regenerative braking energy recovery task of the vehicle, ensuring the effectiveness and reasonableness of the regenerative braking energy recovery operation of the vehicle. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of a regenerative braking energy recovery system for an electric vehicle; Figure 2 It is a schematic flowchart of a method for regenerative braking energy recovery of an electric vehicle. Detailed Embodiments

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] The present invention will be further described below with reference to the embodiments.

[0022] Embodiment 1: An electric vehicle braking energy recovery system according to this embodiment, as Figure 1 shown, includes: A monitoring module for real-time monitoring of the vehicle driving scenario and capturing vehicle driving information in the vehicle driving scenario; An analysis module for receiving the vehicle driving information captured by the monitoring module and analyzing whether the vehicle driving scenario meets the energy recovery condition based on the vehicle driving information; A sub-module is provided under the analysis module, including: A receiving unit for accessing the monitoring module and receiving vehicle driving road information or vehicle state information in the monitoring module; A control unit for monitoring the operating state of the receiving unit and controlling the continuous operation of the analysis module based on the operating state of the receiving unit; Among them, the receiving unit runs continuously twice during the operation stage, respectively receives the vehicle driving road information and the vehicle state information, and after each completion of the reception of the vehicle driving road information or the vehicle state information by the receiving unit, it synchronously forwards it to the analysis module. The analysis module is triggered to run and analyze whether the vehicle driving scenario meets the energy recovery condition based on the vehicle driving road information and the vehicle state information respectively. After the analysis is completed, the control unit controls the analysis module to run again and comprehensively analyzes whether the vehicle driving scenario meets the energy recovery condition based on the results of the previous two analyses; The analysis logic for whether the vehicle driving scenario in the analysis module meets the energy recovery condition is expressed as: ; In the formula: is the determination value for whether the vehicle driving scenario meets the energy recovery condition at the vehicle state information level; is the comprehensive judgment coefficient; is the vehicle speed; is the minimum vehicle speed threshold allowed for energy recovery; , are the accelerator pedal depression depth and the brake pedal depression depth; is the remaining battery capacity of the vehicle; is the maximum storage capacity of the vehicle battery; is the highest temperature threshold at which the motor is allowed to operate; is the motor temperature; Among them, the application parameters in the above formula are all vehicle status information, and the comprehensive judgment coefficient The value is user-defined by the system end-user. The comprehensive judgment coefficient The value ranges from [0.5, 2]. The higher the vehicle's energy recovery ability, the larger the comprehensive judgment coefficient The larger it is, conversely, the comprehensive judgment coefficient The smaller it is. The depression depths of the accelerator pedal and the brake pedal both range from 0 to 1. When the accelerator pedal or the brake pedal is fully depressed 、 The value is 1. When the accelerator pedal or the brake pedal is not depressed 、 The value is 0. is the unit step function, ; The analysis logic for whether the vehicle driving scenario in the analysis module meets the energy recovery condition is expressed as: ; In the formula: is the determination value for whether the vehicle driving scenario at the vehicle driving road information level meets the energy recovery condition; is the comprehensive judgment coefficient; is the maximum slope allowed for braking energy recovery as designed for the vehicle; is the road section slope; is the road section curvature; is the remaining length of the current road section where the vehicle is located; is the total length of the road section; is the current vehicle speed; is the speed limit for the current road section; Among them, The value of the comprehensive judgment coefficient ranges from [0.5, 2]. The larger it is, The larger the value is. Conversely, The smaller the value is; The analysis logic for whether the vehicle driving scenario in the analysis module meets the energy recovery condition is expressed as: ; In the formula; is the determination value for whether the vehicle driving scenario meets the energy recovery condition; is the weight; Through the calculation of the above logical formula, a final determination is made on whether the vehicle driving scenario meets the energy recovery condition, providing an accurate control basis for the opening and closing of the vehicle's braking energy recovery function.

[0023] Among them, the determination value of whether the vehicle driving scenario meets the energy recovery condition is calculated by the third operation of the control unit's control analysis module; A determination module is used to set the trigger interval for the vehicle's braking energy recovery, receive the analysis result of whether the vehicle driving scenario meets the energy recovery condition in the analysis module, and make a decision on whether the vehicle performs braking energy recovery based on the comparison between the analysis result and the trigger interval for the vehicle's braking energy recovery; The trigger interval for the vehicle's braking energy recovery in the determination module is user-defined by the system terminal, and the determination module internally has sub-modules, including: A reset unit is used to monitor the real-time position of the vehicle and make a decision on whether the system resets its operation based on the real-time position of the vehicle; Among them, when the reset unit runs and monitors that the real-time position of the vehicle leaves the source section of the current system operation for capturing vehicle driving information, it decides to trigger the system to reset its operation. Otherwise, the reset unit refreshes its operation; A refresh module is used to monitor the stepping action of the vehicle's accelerator pedal in the context of the vehicle performing braking energy recovery. When the target speed of stepping on the accelerator pedal exceeds the current vehicle speed, it refreshes the system operation; A switching module is used to monitor the operation frequency of accelerating the vehicle by stepping on the accelerator pedal when the vehicle enters the braking energy recovery state on the source section of the vehicle driving information, set a switching determination threshold, and when the operation frequency reaches or exceeds the switching determination threshold, modify the operation decision result of the determination module to no; A message module is used to generate a control message for the vehicle's braking energy recovery; Among them, the content of the control message for the vehicle's braking energy recovery generated by the message module operation includes: the amount of braking energy recovered, the duration of the braking energy recovery state, and the number of braking energy recovery actions on the same section; The monitoring module is wirelessly interconnected with the analysis module. The lower level of the analysis module is wirelessly interconnected with a receiving unit and a control unit. The receiving unit is wirelessly interconnected with the monitoring module. The analysis module is wirelessly interconnected with the determination module. The determination module internally is wirelessly interconnected with the reset unit. The reset unit is wirelessly interconnected with the monitoring module. The determination module is wirelessly interconnected with the refresh module, the switching module, and the message module.

[0024] In this embodiment, the monitoring module runs to monitor the vehicle driving scenario in real time, captures vehicle driving information in the vehicle driving scenario, the analysis module runs later to receive the vehicle driving information captured in the monitoring module, analyzes whether the vehicle driving scenario meets the energy recovery condition based on the vehicle driving information, the receiving unit synchronously accesses the monitoring module, and receives the vehicle driving road information or vehicle state information in the monitoring module, the control unit monitors the operating state of the receiving unit in real time, controls the continuous operation of the analysis module based on the operating state of the receiving unit, then the determination module sets the triggering interval for vehicle braking energy recovery, receives the analysis result of whether the vehicle driving scenario in the analysis module meets the energy recovery condition, compares the analysis result with the triggering interval for vehicle braking energy recovery, and decides whether the vehicle performs braking energy recovery, the reset unit synchronously monitors the real-time position of the vehicle, and decides whether the system resets and runs based on the real-time position of the vehicle, the refresh module further monitors the stepping action of the vehicle's accelerator pedal in the context of the vehicle performing braking energy recovery, when the target speed of stepping on the accelerator pedal exceeds the current vehicle speed, refreshes the system operation, and monitors, through the switching module, the operation frequency of stepping on the accelerator pedal to control the vehicle acceleration when the vehicle enters the braking energy recovery state on the road section where the vehicle driving information source is located, sets the switching determination threshold, and when the operation frequency reaches or exceeds the switching determination threshold, modifies the operation decision result of the determination module to no, and finally the message module generates a vehicle braking energy recovery control message; Through the operation of the system in the above embodiment, it provides a further specified control effect for vehicle braking energy recovery, ensures that the start and stop of the vehicle braking energy recovery task are more reasonable, and thus ensures the actual benefit of vehicle braking energy recovery.

[0025] As Figure 1 shown, the vehicle driving scenario real-time monitored by the monitoring module is derived from the in-vehicle navigation system, and the vehicle driving information includes: vehicle driving road information, vehicle state information, the vehicle state information includes: vehicle speed, braking pedal depression depth, accelerator pedal depression depth, and the vehicle driving road information includes: slope, curvature, length, speed limit information of the road section where the vehicle is currently located; Among them, during the operation stage of the monitoring module, it synchronously monitors the vehicle's own position information, intercepts the road section between the end point of the road section where the vehicle is currently located and the vehicle's own position information in the road section where the vehicle is currently located, and uses the intercepted road section as the monitoring target of the vehicle driving road information.

[0026] Through the above settings, the content of the vehicle driving information is limited, providing the necessary operation data support for the module operation of the system in this embodiment.

[0027] As Figure 1As shown, the switching determination threshold in the switching module is user-defined by the system end. Based on the comparison result between the operation frequency and the switching determination threshold, after modifying the operation decision result of the determination module, the system operation state is the same as the control result of the system when the decision result of the reset unit is yes.

[0028] Through the above settings, the operation logic of the switching module is further defined to ensure that the switching module operates more stably in the system.

[0029] Embodiment 2: At the specific implementation level, on the basis of Embodiment 1, this embodiment refers to Figure 2 to further specifically illustrate a braking energy recovery system for an electric vehicle in Embodiment 1: A braking energy recovery method for an electric vehicle, including: Capturing vehicle driving information in the vehicle driving scenario; Analyzing whether the vehicle driving scenario meets the braking energy recovery conditions according to the vehicle driving information; If the analysis result is no, monitoring whether the vehicle has left the road section where the captured vehicle driving information is from. When the monitoring result is yes, the refresh step is executed; otherwise, the monitoring operation is refreshed; If the analysis result is yes, controlling the vehicle to perform the braking energy recovery operation on the road section where the captured vehicle driving information is from; In the scenario where the vehicle performs the braking energy recovery, monitoring the stepping action of the vehicle's accelerator pedal. When the target vehicle speed of the stepped-on accelerator pedal exceeds the current vehicle speed, the braking energy recovery operation ends; Monitoring the operation frequency of stepping on the accelerator pedal to control the vehicle acceleration in the state of the vehicle's braking energy recovery, setting a switching determination threshold, and ending the braking energy recovery operation when the operation frequency reaches or exceeds the switching determination threshold; The generation stage of the vehicle braking energy recovery control message.

[0030] To sum up, the system in the above embodiments mainly serves the existing mature vehicle braking energy recovery technology, which brings control services in the actual application scenario for the application of the vehicle braking energy recovery technology, ensures that the vehicle braking energy recovery operation can be applied in a reasonable state, ensures that the braking energy recovery benefit is higher each time the vehicle performs the braking energy recovery, avoids the problems of frequent switching of the vehicle braking energy recovery operation and low braking energy recovery benefit, and comprehensively considers the vehicle's own state and the road conditions of the road section where it is located to decide whether to perform the vehicle braking energy recovery during the vehicle braking energy recovery task decision stage, ensuring the effectiveness and rationality of the vehicle braking energy recovery operation.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A braking energy recovery system for an electric vehicle, characterized in that: include: A monitoring module is used to monitor the vehicle driving scene in real time and capture the vehicle driving information in the vehicle driving scene; An analysis module, used for receiving the vehicle driving information captured by the monitoring module, and analyzing whether the vehicle driving scene meets the energy recovery conditions based on the vehicle driving information; A determination module is used to set a braking energy recovery triggering interval for the vehicle, receive the analysis result of whether the vehicle driving scene meets the energy recovery conditions in the analysis module, and decide whether the vehicle performs braking energy recovery based on the comparison between the analysis result and the braking energy recovery triggering interval of the vehicle; A refresh module is used to monitor the stepping action of the accelerator pedal of the vehicle when the vehicle is performing brake energy recovery, and refresh the system operation when the target speed of the accelerator pedal exceeds the current vehicle speed; A switching module is used to monitor the operation frequency of the vehicle accelerating by pressing the accelerator pedal when the vehicle enters the braking energy recovery state on the road section where the vehicle driving information is sourced, set a switching determination threshold, and modify the operation decision result of the determination module to no when the operation frequency reaches or exceeds the switching determination threshold; A message module, used to generate a vehicle braking energy recovery control message; Among them, the message module runs to generate the vehicle braking energy recovery control message content including: braking energy recovery amount, braking energy recovery state duration, and the number of braking energy recovery actions on the same road section.

2. The electric vehicle braking energy recovery system according to claim 1, characterized in that: The vehicle driving scene monitored in real time by the monitoring module is derived from the vehicle navigation system. The vehicle driving information includes: vehicle driving road information and vehicle status information. The vehicle status information includes: vehicle speed, brake pedal depression depth, accelerator pedal depression depth. The vehicle driving road information includes: slope, curvature, length, and speed limit information of the road section where the vehicle is currently located. Among them, during the operation stage of the monitoring module, the car's own position information is monitored synchronously, and the car's own position information is intercepted in the current section of the road where the car is located. The section between the end point of the current section of the car and the car's own position information is used as the monitoring target of the car's driving road information.

3. The electric vehicle braking energy recovery system according to claim 1, characterized in that: The analysis module is provided with submodules at the lower level, including: A receiving unit, used for accessing the monitoring module and receiving the vehicle driving road information or vehicle status information in the monitoring module; A control unit, used for monitoring the operating status of the receiving unit and controlling the continuous operation of the analysis module based on the operating status of the receiving unit; Among them, the receiving unit runs twice continuously during the operation phase to receive the vehicle's driving road information and the vehicle's status information respectively. After the receiving unit completes the reception of the vehicle's driving road information or the vehicle's status information each time, it synchronously forwards it to the analysis module. The analysis module triggers the operation to analyze whether the vehicle's driving scene meets the energy recovery conditions based on the vehicle's driving road information and the vehicle's status information respectively. After the analysis is completed, the control unit controls the analysis module to run again, and comprehensively analyzes whether the vehicle's driving scene meets the energy recovery conditions based on the results of the previous two analyses.

4. The electric vehicle braking energy recovery system according to claim 3, characterized in that: The analysis logic of whether the vehicle driving scene meets the capacity recovery conditions in the analysis module is expressed as follows: ； Where: It is the judgment value of whether the vehicle driving scene meets the capacity recovery conditions at the vehicle status information level; is the comprehensive judgment coefficient; is the vehicle speed; The minimum vehicle speed threshold allowed for energy recovery; , The accelerator pedal depression depth and the brake pedal depression depth; The remaining battery level of the car; The maximum storage capacity of the car battery; The maximum temperature threshold allowed for the motor to operate; is the motor temperature; Among them, the application parameters of the above formula are all vehicle status information, and the comprehensive judgment coefficient The value is defined by the system user, and the comprehensive judgment coefficient The value is in the range of [0.5, 2]. The higher the vehicle recovery capacity, the higher the comprehensive judgment coefficient. The larger the value, the smaller the comprehensive judgment coefficient The smaller the value, the accelerator pedal depression depth and brake pedal depression depth are both 0~1. The accelerator pedal or brake pedal is fully depressed. , The value is 1, the accelerator pedal or brake pedal is not pressed , The value is 0. is a unit step function, .

5. The electric vehicle braking energy recovery system according to claim 4, characterized in that: The analysis logic of whether the vehicle driving scene meets the capacity recovery conditions in the analysis module is expressed as follows: ； Where: It is the judgment value of whether the vehicle driving scene meets the capacity recovery conditions at the vehicle driving road information level; is the comprehensive judgment coefficient; The maximum braking energy recovery slope allowed by the vehicle design; is the slope of the road section; is the road section curvature; The remaining length of the road section where the vehicle is currently located; is the total length of the road section; is the current speed of the car; Set the speed limit for the current road section; in, The comprehensive judgment coefficient value is in the range of [0.5, 2]. The bigger, The larger the value, the smaller the The smaller the value.

6. The electric vehicle braking energy recovery system according to claim 5, characterized in that: The analysis logic of whether the vehicle driving scene meets the energy recovery conditions in the analysis module is expressed as follows: ； Where: It is the judgment value of whether the vehicle driving scene meets the energy recovery conditions; is the weight; Among them, the judgment value of whether the vehicle driving scene meets the energy recovery conditions The calculation control unit controls the third operation of the analysis module.

7. The electric vehicle braking energy recovery system according to claim 1, characterized in that: The vehicle braking energy recovery triggering interval in the determination module is customized by the system end user, and the determination module is internally provided with submodules, including: A reset unit, used to monitor the real-time position of the car and decide whether to reset the system based on the real-time position of the car; Among them, when the reset unit monitors that the real-time position of the car leaves the source road section where the current system operates to capture the car's driving information, the decision triggers the system reset operation, otherwise, the reset unit refreshes the operation.

8. The electric vehicle braking energy recovery system according to claim 1, characterized in that: The switching judgment threshold in the switching module is customized by the system user. After the switching module modifies the operation decision result of the judgment module based on the comparison result between the operation frequency and the switching judgment threshold, the system operation state is the same as the control result of the system when the decision result of the reset unit is yes.

9. The electric vehicle braking energy recovery system according to claim 1, characterized in that: The monitoring module is interactively connected to the analysis module via a wireless network, the analysis module is interactively connected to a receiving unit and a control unit via a wireless network, the receiving unit is interactively connected to the monitoring module via a wireless network, the analysis module is interactively connected to the determination module via a wireless network, the determination module is internally interactively connected to a reset unit via a wireless network, the reset unit is interactively connected to the monitoring module via a wireless network, and the determination module is interactively connected to a refresh module, a switching module and a message module via a wireless network.

10. A method for electric vehicle braking energy recovery, the method being an implementation method of an electric vehicle braking energy recovery system as claimed in any one of claims 1 to 9, characterized in that: include: Capturing vehicle driving information in a vehicle driving scene; Analyze whether the vehicle driving scene meets the braking energy recovery conditions based on the vehicle driving information; If the analysis result is no, monitor whether the car has left the road section from which the captured car driving information comes. If the monitoring result is yes, the refresh step is executed, otherwise, the monitoring operation is refreshed; The analysis result is that the vehicle is controlled to perform a braking energy recovery operation on the road section where the captured vehicle driving information is obtained; In the scenario where the car performs brake energy recovery, the stepping action of the car's accelerator pedal is monitored, and when the target vehicle speed of the accelerator pedal exceeds the current vehicle speed, the brake energy recovery operation is terminated; Monitor the operation frequency of pressing the accelerator pedal to accelerate the vehicle under the state of vehicle braking energy recovery, set a switching determination threshold, and end the braking energy recovery operation when the operation frequency reaches or exceeds the switching determination threshold; The generation stage of vehicle braking energy recovery control message.

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