CN108663061B - Electric automobile mileage estimation system and estimation method thereof - Google Patents

Electric automobile mileage estimation system and estimation method thereof Download PDF

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CN108663061B
CN108663061B CN201810241162.2A CN201810241162A CN108663061B CN 108663061 B CN108663061 B CN 108663061B CN 201810241162 A CN201810241162 A CN 201810241162A CN 108663061 B CN108663061 B CN 108663061B
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付主木
李桢辉
高爱云
陶发展
李勋
苏攀攀
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Henan University of Science and Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
    • G01C21/34—Route searching; Route guidance
    • G01C21/3453—Special cost functions, i.e. other than distance or default speed limit of road segments
    • G01C21/3469—Fuel consumption; Energy use; Emission aspects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2260/00—Operating Modes
    • B60L2260/40—Control modes
    • B60L2260/50—Control modes by future state prediction
    • B60L2260/52—Control modes by future state prediction drive range estimation, e.g. of estimation of available travel distance
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    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
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    • Y02T90/167—Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S30/00—Systems supporting specific end-user applications in the sector of transportation
    • Y04S30/10—Systems supporting the interoperability of electric or hybrid vehicles
    • Y04S30/12—Remote or cooperative charging

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Abstract

The invention provides an electric automobile mileage pre-estimation system and a pre-estimation method thereof. The SOC estimation module of the electric automobile consists of an upper computer and a sensor; the GPS automobile positioning and navigation module utilizes a satellite GPS system to position an automobile, searches the position of the charging pile through a map, and utilizes a navigation system to plan the automobile driving route; the mileage pre-estimating module calculates whether the electric automobile can reach the nearest electric automobile charging pile by the current SOC through a pre-estimating algorithm, and the mileage pre-estimating method comprises a distance pre-estimating step and a battery SOC pre-estimating step. According to the method, through the distance estimation step and the battery SOC estimation step, whether the residual electric quantity of the electric automobile can reach the charging pile with the nearest distance is predicted, and the electric automobile is prevented from being anchored midway due to insufficient electric quantity.

Description

Electric automobile mileage estimation system and estimation method thereof
Technical Field
The invention belongs to the field of electric automobiles, and particularly relates to an electric automobile mileage estimation system and an estimation method thereof.
Background
Along with the popularization of electric vehicles, the infrastructure such as charging piles is gradually perfected, and the electric vehicles can also run on various complex roads like traditional fuel vehicles. When the electric automobile runs at an unknown journey or high speed, the position of the charging pile is unknown because the electric automobile runs at the unknown journey or high speed, and some electric automobiles need to use a specific charging pile, so that the electric automobile is extremely unsafe when the electric automobile stops suddenly on a road. Therefore, it is extremely important to be able to reach the latest charging pile according to the current remaining capacity. The development of future electric vehicles is difficult to meet by means of only battery SOC estimation. The residual energy is only the distance that the electric automobile can travel, and the problem that whether the residual energy of the electric automobile can reach the nearest charging pile is still blank. At present, the electric automobile is in a development stage and only provided with a battery SOC estimation module and a navigation module, but the battery SOC estimation module and the navigation module are not fully utilized, so that the mileage estimation of the electric automobile is inaccurate.
Disclosure of Invention
In order to solve the problems, the invention provides an electric vehicle mileage estimation system and an estimation method thereof, which can realize the prediction of whether the residual electric quantity of the electric vehicle can reach the charging pile with the nearest distance through a distance estimation step and a battery SOC estimation step, and prevent the electric vehicle from being anchored midway due to insufficient electric quantity.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides an electric automobile mileage pre-estimation system which characterized in that: the estimation system comprises an electric vehicle SOC estimation module, a GPS vehicle positioning and navigation module and a mileage estimation module, wherein the electric vehicle SOC estimation module consists of an upper computer and a sensor; the GPS automobile positioning and navigation module utilizes a satellite GPS system to position an automobile, searches the position of the charging pile through a map, and utilizes a navigation system to plan an automobile driving route; the mileage estimation module is used for calculating whether the electric automobile can reach the nearest electric automobile charging pile by the current SOC through an estimation algorithm.
The invention also provides a prediction method of the electric automobile mileage prediction system, which is used for predicting whether the residual electric quantity of the electric automobile can reach the nearest charging pile, and the mileage prediction method comprises a distance prediction step and a battery SOC prediction step and is characterized in that: the mileage estimation step comprises:
the method comprises the steps of firstly, measuring and calculating a real-time distance through a distance estimation method, positioning the electric automobile in real time through a GPS satellite positioning system, planning a route from the electric automobile to a charging pile through a navigation system or reaching the charging pile through a set route, and obtaining a real-time distance S from the electric automobile to the charging pile0And transmitting the real-time distance S via a data transmitter0Transmitting the mileage to a mileage estimation module;
step two, the estimation step of the battery SOC is as follows:
a1. acquiring battery output current I of the electric automobile through a current sensor;
a2. acquiring battery capacity Q and charge-discharge efficiency eta, and calculating the SOC of the battery according to the battery capacity and the charge-discharge efficiency:
Figure BDA0001605339680000021
a3. the calculated battery SOC is transmitted to a mileage estimation module;
thirdly, estimating the mileage of the electric automobile by using a mileage estimation module:
b1. acquiring a wheel rotating speed V through a wheel rotating speed sensor;
b2. calculating the continuous discharge to the lowest state of charge SOC at the current ILTime of discharge
Figure BDA0001605339680000022
b3. Calculating the predicted driving distance of the automobile according to the wheel rotating speed V and the discharging time T:
Figure BDA0001605339680000023
b4. judging whether the automobile can safely arrive at the charging pile, and when S>S0When the electric automobile reaches the charging pile, the electric automobile can reach the charging pile; when S is<S0And when the electric automobile cannot reach the charging pile, the alarm system gives an alarm.
Furthermore, the SOC estimation module is connected with a battery power supply and used for measuring and calculating the SOC estimation method of the battery, the upper computer is an arithmetic unit, and the arithmetic unit on the SOC estimation module is also connected with an information input interface and an information output interface.
Furthermore, the output end of the current sensor is connected to the arithmetic unit through the information input interface, and the SOC estimation module also transmits the SOC value to the mileage estimation module through the information output interface.
Furthermore, the electric automobile is provided with a mileage pre-estimation module for measuring and calculating the mileage estimation method, wherein the mileage pre-estimation module comprises a wheel rotating speed sensor, a mileage main control chip and an alarm system.
Furthermore, the output end of the wheel speed sensor is connected with the main control chip, the main control chip is also connected with the data transmitter and the information output interface, and the main control chip calculates the mileage in the third step and compares the mileage with the real-time mileage and feeds back the comparison result to the alarm system.
Further, the main control chip is also provided with a lowest state of charge SOCLAnd a data input port for inputting different minimum charge values.
Further, the mileage estimation of the electric vehicle in the third step can also use a neural network to estimate the mileage of the electric vehicle.
The invention has the beneficial effects that:
1. according to the electric vehicle mileage estimation system and the estimation method thereof, through the distance estimation step and the battery SOC estimation step, the prediction of whether the residual electric quantity of the electric vehicle can reach the nearest charging pile is realized, and the electric vehicle is prevented from being anchored midway due to insufficient electric quantity;
2. the battery SOC estimation step of the electric vehicle mileage estimation system and the estimation method thereof adopts an ampere time integration method, so that the battery SOC values under different road conditions can be conveniently estimated, the estimation of the battery SOC can be changed along with the change of real-time current output, and the influence of external factors such as road conditions and the like is eliminated;
3. the mileage pre-estimation step of the electric vehicle mileage pre-estimation system and the pre-estimation method calculates the predicted driving distance of the vehicle through the real-time rotating speed of the wheels and the pre-estimated SOC value of the battery;
4. the invention introduces the discharge cut-off SOC in the process of the automobile estimated driving distanceLThe calculation of the residual electric quantity is more accurate, and meanwhile, the battery power supply of the electric automobile can be protected, and the service life of the electric automobile is prolonged.
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FIG. 1 is a schematic diagram of the operation of the system of the present invention;
fig. 2 is a schematic diagram of the operation of the system of the present invention.
Wherein, each reference number in the figure is: 1. an electric quantity estimation module; 2. a battery SOC value calculation module; 3. a current sensor; 4. a clock; 5. battery efficiency and capacity; 6. SOC initial value SOC0(ii) a 7. The distance module between the electric automobile and the charging pile; 8. a GPS vehicle positioning and navigation system; 9. a charging pile position; 10. a route from the electric automobile to the charging pile; 11. the current position of the electric vehicle; 12. the distance from the electric automobile to the charging pile; 13. an electric vehicle mileage estimation module; 14. a battery SOC value; 15. inputting a battery SOC value; 16. the battery outputs current; 17. predicted discharge time of the battery; 18. the predicted driving distance of the electric automobile; 19. a wheel speed sensor; 20. whether the automobile can arrive at the charging pile or not; 21. a satellite GPS system; 22. an electric vehicle charging pile; 23. provided is an electric automobile.
Detailed Description
In order that those skilled in the art will be able to better understand the technical solutions provided by the present invention, the following description is provided in conjunction with the specific embodiments.
The present invention will be fully understood from the following description of the embodiments, which are not intended to limit the scope of the present invention.
A mileage pre-estimation system of an electric vehicle comprises an SOC estimation module of the electric vehicle, a GPS vehicle positioning and navigation module and a mileage pre-estimation module, wherein the SOC estimation module of the electric vehicle consists of an upper computer and a current sensor 3; the GPS vehicle positioning and navigation module utilizes a satellite GPS system 21 to position the position of an electric vehicle 23, searches the position of an electric vehicle charging pile 22 through a map, and utilizes a navigation system to plan a vehicle driving route; the mileage estimation module is used for calculating whether the electric automobile can reach the nearest electric automobile charging pile by the current SOC through an estimation algorithm.
A prediction method of an electric automobile mileage prediction system predicts whether the residual electric quantity of an electric automobile can reach a charging pile with the nearest distance through the mileage prediction method, the mileage prediction method comprises a distance prediction step and a battery SOC prediction step, and the specific steps are as follows:
the method comprises the steps of firstly, measuring and calculating a real-time distance through a distance estimation method, positioning the electric automobile in real time through a GPS satellite positioning system, planning a route from the electric automobile to a charging pile through a navigation system or reaching the charging pile through a set route, and obtaining a real-time distance S from the electric automobile to the charging pile0And transmitting the real-time distance S via a data transmitter0Transmitting the mileage to a mileage estimation module;
step two, the estimation step of the battery SOC is as follows:
a1. acquiring battery output current I of the electric automobile through a current sensor;
a2. acquiring battery capacity Q and charge-discharge efficiency eta, and calculating the SOC of the battery according to the battery capacity and the charge-discharge efficiency:
Figure BDA0001605339680000041
a3. the calculated battery SOC is transmitted to a mileage estimation module;
thirdly, estimating the mileage of the electric automobile by using a mileage estimation module:
b1. acquiring a wheel rotating speed V through a wheel rotating speed sensor;
b2. calculating the continuous discharge to the lowest state of charge SOC at the current ILTime of discharge
Figure BDA0001605339680000051
b3. Calculating the predicted driving distance of the automobile according to the wheel rotating speed V and the discharging time T:
Figure BDA0001605339680000052
b4. judging whether the automobile can safely arrive at the charging pile, and when S>S0When the electric automobile reaches the charging pile, the electric automobile can reach the charging pile; when S is<S0Time, judgeFor electric automobile can not reach and fill electric pile, alarm system sends out the police dispatch newspaper.
The SOC estimation module is connected with a battery power supply and used for measuring and calculating a battery SOC estimation method, the upper computer is an arithmetic unit, the arithmetic unit calculates an SOC estimated value by an ampere time method through an input current value, and the arithmetic unit on the SOC estimation module is also connected with an information input interface and an information output interface; the output end of the current sensor is connected to the arithmetic unit through the information input interface, and the SOC estimation module also transmits the SOC value to the mileage estimation module through the information output interface.
The electric automobile is provided with a mileage pre-estimation module for measuring and calculating the mileage estimation method, the mileage pre-estimation module comprises a wheel rotating speed sensor, a mileage main control chip and an alarm system, and the alarm system is used for reminding when the estimated driving distance of the automobile is smaller than the real-time distance, so that the electric automobile is prevented from being anchored in the driving process.
The output end of the wheel speed sensor is connected with the main control chip, the main control chip is also connected with the data transmitter and the information output interface, and the main control chip calculates the mileage in the third step and compares the mileage with the real-time mileage and feeds the comparison result back to the alarm system.
The main control chip is also provided with a lowest state of charge SOCLThe data input port inputs different discharge cutoff values, so that the calculation of the residual electric quantity is more accurate, and meanwhile, the battery power supply of the electric automobile can be protected, and the service life of the electric automobile is prolonged.
The mileage of the electric automobile in the third step can be estimated by using a neural network algorithm, the mileage estimation model of the electric automobile is constructed at first, instantaneous current and battery residual capacity in the process that the electric automobile reaches the position of the electric automobile charging pile 22 are collected on the basis of the mileage estimation model, a plurality of electric automobiles are adopted for sampling respectively, the instantaneous current and the instantaneous battery residual capacity at fixed positions are calculated by matching with a satellite GPS system and are recorded as the instantaneous current and the instantaneous battery residual capacity at fixed positions respectively
Figure BDA0001605339680000053
And
Figure BDA0001605339680000054
Figure BDA0001605339680000055
and
Figure BDA0001605339680000056
corresponding to an average vehicle mileage of
Figure BDA0001605339680000057
Setting the instantaneous battery residual electric quantity value as SOC when the electric automobile moves to a certain pointtWill SOCtInputting the predicted average automobile driving mileage S in the neural network modeltComparing the current if the instantaneous current
Figure BDA0001605339680000061
The electric automobile runs normally if the instantaneous current is
Figure BDA0001605339680000062
And the alarm connected with the mileage estimation model of the electric automobile gives an alarm to remind of deceleration or road condition replacement.
Fig. 1 is a schematic diagram of the operation of the system of the present invention, which includes a satellite GPS system 21, an electric vehicle charging pile 22, and an electric vehicle 23. When the system starts to work, the satellite GPS system 21 sends the current position of the electric automobile 23 to a navigation system of the electric automobile 23, and meanwhile, the navigation system is used for searching the position of the nearest electric automobile charging pile 22 and calculating the distance between the electric automobile 23 and the charging pile; the control system of the electric vehicle 23 calculates the remaining SOC value of the battery; the system calculates whether the electric automobile 23 can reach the nearest electric automobile charging pile 102 with the current SOC value.
Fig. 2 is a schematic diagram of the operation of the system of the present invention, and the electric quantity estimation module 1 works together with the electric vehicle and charging pile distance module 7. First, the current sensor 3, the clock 4, and the initial value SOC of the SOC 06. The values detected by the modules of battery efficiency and capacity 5 and the like are sent to a battery SOC value calculating module to calculate the residual quantity of the electric automobileThe amount of electricity. Meanwhile, the electric automobile and charging pile distance module 7 also starts to work, the GPS automobile positioning and navigation system 8 positions the current position 11 of the electric automobile through a satellite, and searches and determines the charging pile position 9 through the navigation system, the current position 11 of the automobile and the charging pile position 9 send the electric automobile and the charging pile position to the charging pile distance 12 of the electric automobile, the electric automobile sends the selected route to the charging pile distance 12 of the electric automobile, and the distance from the electric automobile to the nearest charging pile is calculated through the distance 12 from the electric automobile to the charging pile. The electric automobile and charging pile distance module 7 and the electric quantity estimation module 1 send the electric automobile and charging pile distance 12, the current sensor 3 and the battery SOC value calculation module 2 to the electric automobile mileage estimation module 13. The electric automobile mileage estimation module 13 receives the data of the electric quantity estimation module 1, the electric automobile and charging pile distance module 7, and calculates the predicted discharging time 17 of the battery according to the SOC value 14 of the battery and the output current 16 of the battery; and finally, the wheel rotating speed measured by the wheel rotating speed sensor 19 and the estimated battery discharging time 17 are used for calculating the estimated running distance 8 of the electric automobile, and finally, the distance 12 from the electric automobile to the charging pile is compared with the estimated running distance 18 of the electric automobile to judge whether the electric automobile can safely reach the charging pile 20.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. A prediction method of an electric vehicle mileage prediction system is characterized by comprising the following steps: the pre-estimation system comprises an electric vehicle SOC estimation module, a GPS vehicle positioning and navigation module and a mileage pre-estimation module; the SOC estimation module of the electric automobile consists of an upper computer and a current sensor; the GPS automobile positioning and navigation module utilizes a satellite GPS system to position an automobile, searches the position of the charging pile through a map, and utilizes a navigation system to plan an automobile driving route; the mileage pre-estimation module calculates whether the electric automobile can reach the nearest electric automobile charging pile by the current SOC through a pre-estimation algorithm;
predicting whether the residual electric quantity of the electric automobile can reach the charging pile with the nearest distance by a mileage pre-estimating method, wherein the mileage pre-estimating method comprises a distance pre-estimating step and a battery SOC pre-estimating step, and the mileage pre-estimating step comprises the following steps:
the method comprises the steps of firstly, measuring and calculating a real-time distance through a distance estimation method, positioning the electric automobile in real time through a satellite GPS system, planning a route from the electric automobile to a charging pile through a navigation system or enabling the electric automobile to reach the charging pile through a set route, and obtaining a real-time distance S from the electric automobile to the charging pile0And transmitting the real-time distance S via a data transmitter0Transmitting the mileage to a mileage estimation module;
step two, the estimation step of the battery SOC is as follows:
a1. acquiring battery output current I of the electric automobile through a current sensor;
a2. acquiring battery capacity Q and charge-discharge efficiency eta, and calculating the SOC of the battery according to the battery capacity and the charge-discharge efficiency:
Figure FDA0003303733940000011
a3. the calculated battery SOC is transmitted to a mileage estimation module;
estimating the mileage of the electric automobile by using a mileage estimation module, and estimating the mileage of the electric automobile by using a neural network algorithm: firstly, constructing an electric automobile mileage pre-estimation model, acquiring instantaneous current and battery residual capacity of an electric automobile in the process of reaching a charging pile position on the basis of the model, respectively sampling by adopting a plurality of electric automobiles, calculating average instantaneous current and average instantaneous battery residual capacity at a fixed position by matching with a satellite GPS system, and respectively recording as
Figure FDA0003303733940000012
And
Figure FDA0003303733940000013
Figure FDA0003303733940000014
and
Figure FDA0003303733940000015
corresponding to an average vehicle mileage of
Figure FDA0003303733940000016
Setting the instantaneous battery residual electric quantity value as SOC when the electric automobile moves to a certain pointtWill SOCtInputting the predicted average automobile driving mileage S in the neural network modeltComparing the current if the instantaneous current
Figure FDA0003303733940000017
The electric automobile runs normally if the instantaneous current is
Figure FDA0003303733940000018
An alarm is given to remind of deceleration or road condition change.
2. The estimation method of the electric vehicle mileage estimation system according to claim 1, wherein: the SOC estimation module is connected with a battery power supply and used for measuring and calculating the SOC estimation method of the battery, the upper computer is an arithmetic unit, and the arithmetic unit on the SOC estimation module is further connected with an information input interface and an information output interface.
3. The estimation method of the electric vehicle mileage estimation system according to claim 2, wherein: the output end of the current sensor is connected to the arithmetic unit through the information input interface, and the SOC estimation module also transmits the SOC value to the mileage estimation module through the information output interface.
4. The estimation method of the electric vehicle mileage estimation system according to claim 1, wherein: the mileage pre-estimation module is used for measuring and calculating the mileage pre-estimation method, and comprises a wheel rotating speed sensor, a mileage main control chip and an alarm system.
5. The estimation method of the electric vehicle mileage estimation system according to claim 4, wherein: the output end of the wheel speed sensor is connected with the main control chip, the main control chip is also connected with the data transmitter and the information output interface, and the main control chip is used for conducting prediction of mileage in the third step, comparison of the predicted mileage and the real-time distance and feeding back the comparison result to the alarm system.
6. The estimation method of the electric vehicle mileage estimation system according to claim 5, wherein: the main control chip is also provided with a lowest state of charge SOCLThe data input port of (2) inputs different minimum charge values.
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