JP3919009B2 - Method and apparatus for monitoring electric vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for monitoring an electric vehicle, and more particularly, to a method for monitoring an electric vehicle so as not to hinder the return to a home position.
[0002]
[Prior art]
When a terminal device having a function of transmitting the current position information to the center device is mounted on a vehicle or held by a person, and the user wants to recognize the current position of the vehicle or the person, the current position is transferred from the center device to the terminal device. Monitoring systems are known that send out a signal requesting. In this monitoring system, an appropriate treatment can be performed based on the current position information returned from the terminal device.
[0003]
Further, as a similar system, for example, Japanese Patent Application Laid-Open No. 2002-260184 defines the vicinity of the home as the home position of the mobile body, and the mobile body moves when the mobile body moves out of the home position or at a predetermined time. A mobile body monitoring system is disclosed in which an emergency call is made to a predetermined monitoring center when the vehicle does not return to the home position.
[0004]
Such a monitoring system is useful for protecting people with low judgment ability, such as elderly people and infants.
[0005]
[Problems to be solved by the invention]
However, the monitoring system may be useful even for a person who has sufficient judgment ability. For example, a small and low-speed electric vehicle used by elderly people is slower than a normal vehicle, which is about the same as a person's walking speed, so it takes time to move, traffic congestion or talking to people. May take longer than planned. As a result, even a user who has sufficient judgment ability may not be able to return at the scheduled time, or may be unable to return because the vehicle battery is exhausted. Thus, it is always necessary to take care such as monitoring the remaining amount of the battery, and it is not always easy for a driver such as an elderly person to take into consideration that the battery has sufficient margins. There was a problem that the range of action was narrowed by paying much attention to the remaining battery power.
[0006]
In view of the above problems, the present invention provides a monitoring method for an electric vehicle that is suitable for automatically recognizing a situation in which there is a possibility of causing trouble in returning even if the driver himself is not careful. The purpose is to do.
[0007]
[Means for Solving the Problems]
In order to solve the above problems and achieve the object, the present invention provides an electric motor for monitoring the driving state of an electric vehicle having communication means for transmitting the driving state and the current position to the base station, such as the remaining battery level. In the vehicle monitoring method, the base station detects a route distance from the current position of the electric vehicle to a planned return position, or a distance of the searched suitable travel route, and determines the driving state and the route distance. Predicting whether or not the electric vehicle will have trouble returning to the return position with sufficient margin, and when it is predicted that the trouble will occur, a scheduled report destination, for example, the electric vehicle or the return position The first feature is that an alarm signal is sent to a facility in
[0008]
According to the first feature, in the base station that detects the driving state of the vehicle, for example, based on the remaining battery level, it is determined whether there is enough room to travel to the planned return position. An emergency signal will be sent to the scheduled report destination if any trouble is expected in every return. Therefore, a report destination that has received this emergency signal, for example, an electric vehicle being monitored, can quickly return, and a facility such as a nursing home to which the electric vehicle should return uses a mobile phone or the like for the electric vehicle. To encourage return.
[0009]
According to the present invention, the base station includes sunset time information, and a sunset warning is provided when it is predicted that the base station will sunset during traveling the route distance based on the moving speed and sunset time information of the electric vehicle. A second feature is that a signal is sent to an electric vehicle or a facility at the return position.
[0010]
According to the 2nd characteristic, it can recognize that the electric vehicle etc. which received the sunset warning signal are the time which must return.
[0011]
In addition, when the sunset is predicted, it is predicted whether there is a margin for return according to the remaining battery level in consideration of the power consumption of the lamp after sunset. A third feature is that an alarm signal is transmitted to an electric vehicle or a facility at the return position.
[0012]
According to the third feature, since an emergency warning signal is sent when sunset approaches and the remaining battery level is low, driving of an electric vehicle that has received this emergency warning signal must return. Recognize that the time is urgent and take action such as speeding up the return.
[0013]
In addition, the present invention has a fourth feature in that the communication means is a mobile phone equipped with a GPS function, and the mobile phone receives the warning signal, sunset warning signal, and emergency warning signal.
[0014]
According to the fourth feature, it is possible to perform a necessary warning display in response to an alarm signal or the like with a mobile phone with a GPS function that has recently become easy to obtain.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 2 is a view of the electric vehicle according to the embodiment of the present invention as viewed from the right rear. In the figure, an electric vehicle 1 is a four-wheeled vehicle driven by a motor, for example, a vehicle for elderly people traveling at a maximum speed of 6 km / hour. The body frame 2 constituting the vehicle body includes a front part 2a, a rear part 2b, and a step 2c. A pair of left and right front wheels 3 (the left front wheel is hidden) is supported on the front portion 2a, and a steering post 4 connected to the front wheel 3 extends rearward in the upper part. A steering handle 6 having an operation panel 5 is mounted on the steering post 4. Turn signal lamps (winker lamps) 7R and 7L as direction indicators are provided on the left and right side surfaces of the front portion 2a of the vehicle body frame 2. An indicator for displaying the operation of the turn signal lamps 7R and 7L is provided on the operation panel 5. On the left side of the operation panel 5 is mounted a mobile phone PH that transmits the driving state of the electric vehicle 1, for example, the position of the vehicle, battery voltage, accelerator angle sensor, and the like to a preset transmission destination. It is desirable that the mobile phone PH has a built-in GPS (Global Positioning System) function. However, a GPS function including a GPS antenna can be provided separately from the mobile phone PH, for example, in the front frame 2a. Good.
[0016]
A pair of left and right rear wheels 8, which are drive wheels, are supported on the rear portion 2 b of the vehicle body frame 2. A seat 9 is provided on the upper surface of the rear portion 2b, and a motor M, a battery 50 for driving the motor M, and a battery charger (not shown) are provided below the seat 9.
[0017]
FIG. 7 is a plan view of the steering handle 6. The steering handle 6 has left and right grips 10, 11, and ends of the grips 10, 11 project to the left and right to bend forward and are joined at the center to form a link. An operation panel 5 is disposed at the center of the steering handle 6. A volume 12 that adjusts the traveling speed is arranged in the center of the operation panel 5, and a select switch 13 that selects forward / backward movement of the vehicle is provided in front of the volume 12. A turn signal switch (blinker switch) 14 is provided in front of the left side of the volume 12. A horn switch 15 and a headlight switch 16 are provided on the foremost side of the operation panel 5, and a key hole 17 of a main switch is provided in the middle of them.
[0018]
A travel lever 18 protrudes from the right side of the operation panel 5. The lever 18 is bent in a crank shape. When the end 18a is pushed down, the vehicle travels. When the lever 18 is released, the lever 18 returns by a spring and the vehicle stops. Further, a brake lever and a mirror (not shown) are attached to the left front portion 6 a of the steering handle 6.
[0019]
A display 19 is provided in front of the center of the operation panel 5. The indicator 19 is an LED display device that has both a battery remaining capacity display function and an operation display function of the blinker lamp 7 (the blinker turn signal lamps 7R and 7L). The display 19 includes a plurality (5 in this example) of LEDs 20 arranged in a horizontal (left and right) row. The number of LEDs 20 corresponding to the remaining battery level is lit, and the turn signal switch 14 is operated. Sometimes it lights up in a scheduled pattern corresponding to the switching position.
[0020]
A mobile phone holder 21 for mounting the mobile phone PH is provided on the left side of the operation panel 5. The mobile phone holder 21 is fixed to a stay (described later) coupled to a base member 22 that supports the operation panel 5. For example, the mobile phone holder 21 has a guide portion 211 that allows the main body (the side on which buttons and keys are arranged) to be mounted in a state in which the foldable mobile phone PH is opened. A communication connector 212 that can be coupled to an external connection terminal of the mobile phone PH is provided at the bottom of the mobile phone holder 21. A cable 23 with a connection terminal is pulled out from the communication connector 212. The cable 23 is connected to a communication unit (described later) for transmitting data indicating the driving state including the battery remaining amount of the electric vehicle 1 to the base station through the mobile phone PH. The communication unit can be accommodated in the base member 22 or in the vehicle body frame that covers the lower portion of the handle post 4.
[0021]
3 is a front view of the mobile phone holder 21, FIG. 4 is a side view, and FIG. 5 is a top view. The cellular phone holder 21 has a stay 213 as shown in the figure, and the stay 213 is fixed to the base member 22 with a set screw 24 (see FIG. 5). The communication connector 212 provided on the bottom of the mobile phone holder 21 is adapted to an external connection terminal provided on the bottom surface of the mobile phone PH. The lower region 214 of the mobile phone holder 21 can be made transparent so that it can be recognized that the external connection terminal of the mobile phone PH and the communication connector 212 are securely connected. In addition, a lock unit can be provided so that the connection between the external connection terminal and the communication connector 212 is not loosened due to vibration during traveling of the vehicle 1. The eject button 25 is provided to release the lock means.
[0022]
Further, the mobile phone holder 21 can have a function as a storage battery charging device provided inside the mobile phone PH. A charging terminal 26 is provided on the top of the mobile phone holder 21. The charging terminal 26 is supplied with electric power having electrical specifications adapted from a battery 50 mounted on the electric vehicle 1 through the cable 27. The installation position of the charging terminal 26 is determined so as to correspond to the position of the charging terminal on the mobile phone PH side.
[0023]
FIG. 6 is a block diagram of a communication system mounted on the electric vehicle 1. The communication unit 28 includes a CPU 281, an EEPROM 282, a communication interface circuit 284, and a power supply unit 285. The ECU 29 controls the motor M that drives the vehicle and monitors the operating state of the electric vehicle 1. The communication interface circuit 284 is connected to the ECU 29, reads information indicating the driving state of the electric vehicle 1 detected by the ECU 29, and communicates this information and the like from the mobile phone PH as a communication device to the base station 30 via radio. The mobile phone PH is connected to the communication interface circuit 284 and communicates with the base station 30 according to an instruction input from the CPU 29 via the communication interface circuit 284.
[0024]
The ECU 29 transmits sensing data from various sensors provided in the electric vehicle 1, for example, an accelerator angle sensor that detects the amount of depression of the travel lever 18 and a battery voltage detection device, to the communication unit 28. The transmission unit 28 is electrically operated through the mobile phone PH. The status data of the vehicle 1 is sent to the general public network 100.
[0025]
When the mobile phone PH does not include GPS, the electric vehicle 1 main body can be equipped with a GPS function, that is, a GPS receiving circuit 31 that receives a GPS antenna ANT and a GPS signal. In that case, the position of the electric vehicle 1 is calculated based on the position information (GPS information) detected by the CPU 281 and the GPS receiving circuit 31 of the communication unit 28.
[0026]
The mobile phone PH has a liquid crystal display screen for displaying the communication status, mail communication text, and the like. In addition to being able to display the operating status (failure status) of the electric vehicle 1 on this display screen, when the remaining battery level has a value that can be predicted that there is an obstacle to the return of the electric vehicle 1 to the home position In accordance with the alarm signal output from the base station 30, the alarm can be displayed.
[0027]
The alarm signal is output based on the following determination. The base station 30 that monitors the electric vehicle 1 owns the map data in which the position of the facility to which the electric vehicle 1 should return, such as the home position of the electric vehicle 1, that is, a nursing home, is registered. There are generally a plurality of electric vehicles 1 to be monitored, and a home position is registered for each vehicle. The electric vehicle 1 transmits its driving state data and GPS information to the base station. The base station determines whether the status of the electric vehicle 1 determined from the driving state data does not hinder the return to the home position based on the driving state data, GPS information, and data indicating the home position. For example, it is determined whether or not there is a sufficient battery level for returning to the home position from the remaining battery level and the current position of the electric vehicle 1 indicated by the GPS information and the route distance between the home positions. If it is determined that the remaining battery level is not sufficient enough for return if the vehicle stays further or moves away from the home position, an alarm signal is output.
[0028]
A straight line distance between the current position and the home position may be regarded as an approximate route distance, or a route on which the electric vehicle 1 described on the map data can travel is searched for and an appropriate return route is determined from the route. And the route length may be integrated to obtain the route distance. As an appropriate return route, it is preferable to select a road with the shortest distance so that the battery consumption is low. For example, a safe road with a small amount of traffic may be selected as the return route. Information on whether or not the electric vehicle 1 can travel is obtained by investigating the actual surrounding road conditions and taking it in advance on the map database. The surrounding road condition includes a road gradient, and it is preferable to consider the gradient as a load on the motor and take a correction coefficient into consideration when calculating the route distance.
[0029]
Further, by making it possible to detect the load current of the vehicle driving motor and the speed of the electric vehicle 1, and actually measuring these during driving and storing and learning, the driving data of surrounding road conditions is stored in the base station 30 as a database. By using this, it is possible to improve the accuracy of the determination of whether or not to return.
[0030]
In addition, the battery is consumed not only by the driving of the travel motor but also by lighting of the lights (headlights, etc.), so the alarm signal output judgment criterion is considered in consideration of the necessity of lighting of the lights as well as the route distance. It is good to do. That is, the base station 30 stores the sunset time information for each season as a database, and calculates the travel time by turning on the lamp before returning to the home position based on the current time and the sunset time information. Then, the battery amount (electric power amount) consumed at the time of lighting is subtracted from the remaining battery amount. And the distance which can drive | work according to this battery remaining charge is calculated.
[0031]
Next, a process for determining the output of an alarm signal from the base station, that is, a process for determining whether or not to return to the home position will be described. FIG. 8 is a flowchart illustrating an example of a return possibility determination process. In step S1, it is determined whether or not the elapsed time Tx from the previous return possibility determination process has reached a predetermined interval time Tj for determination. If this determination is affirmative, GPS information is obtained from the electric vehicle 1 (step S2), and the current position of the electric vehicle 1 is calculated based on the GPS information (step S3). In step S4, the remaining battery level is obtained from the electric vehicle 1 and held as a value A.
[0032]
In step S5, the route distance to the home position is calculated from the map database and the current position, and held as a value C. As described above, the route distance may be a straight distance, or may be determined by searching for a road on which the electric vehicle 1 can travel.
[0033]
In step S6, the distance B that can be traveled with the remaining battery charge A is calculated. The travelable distance B is preferably determined in consideration of the motor load factor. FIG. 9 is a table showing the travelable distance B corresponding to the battery remaining amount A using the average load factor Cm of the motor as a parameter. For example, the travelable distance B is determined using this table. The average load factor Cm is an average value of the load factors applied to the vehicle drive motor from a predetermined actual operating time (for example, 60 minutes) to the present time.
[0034]
In step S7, a scheduled return time to the home position is calculated. The scheduled return time is obtained by adding the current time to the value obtained by dividing the route distance C by the average moving speed (from a predetermined time before) of the electric vehicle 1.
[0035]
In step S8, the battery margin is determined based on whether or not a value obtained by subtracting the route distance C from the travelable distance B and further dividing by the distance correction coefficient k1 is greater than a preset margin value Z1. The distance correction coefficient k1 is determined by the road gradient. For example, the gradient of the traveling road from a predetermined actual operating time to the present is calculated with reference to a predetermined calculation formula or table on the map data or based on the motor load current and traveling speed by actual traveling.
[0036]
If the determination in step S8 is negative, it is determined that there is not enough room in the remaining battery level, so the process proceeds to step S9 to output an alarm signal for prompting the return to the home position. This alarm signal is transmitted to at least one of the scheduled report destinations such as the electric vehicle 1 and the facility at the home position, and the electric vehicle 1 and the report destination return by visual display or voice display in response to the alarm signal. A warning prompting
[0037]
On the other hand, if step S8 is affirmative, it is determined that there is a sufficient margin in the remaining battery capacity required for feedback. In this case, it progresses to step S10 and it is judged whether it can return to a home position by sunset. This determination is made by comparing the predicted return time and the sunset time information. If it is determined that the vehicle cannot be returned by sunset, the process proceeds to step S11 to output a sunset warning signal. This sunset warning signal is transmitted to at least one of the scheduled report destinations such as the electric vehicle 1 and the facility at the home position, and the electric vehicle 1 and the report destination display a visual display in response to the sunset warning signal. An audio display alerts you that sunset is near.
[0038]
In step S12, the margin of the battery 50 is determined based on whether or not the value obtained by subtracting the route distance C from the travelable distance B and further dividing by the distance correction coefficient k2 is greater than a preset margin value Z2. The distance correction coefficient k2 is determined in consideration of battery consumption due to lighting of the headlight after sunset. The margin value Z2 is a safety value with a minimum margin for the travel distance to the home position (Z1> Z2).
[0039]
If step S12 is negative, it is determined that there is no more remaining battery capacity when sunset is taken into consideration, and the process proceeds to step S13 to output an emergency warning signal. The emergency warning signal is transmitted to at least one of the scheduled report destinations such as the electric vehicle 1 and the facility at the home position, and the electric vehicle 1 and the report destination display a visual display and a voice display in response to the emergency warning signal. A warning (emergency warning) prompting immediate return is issued. If step S12 is affirmative, it is determined that the battery 50 has room even when sunset is taken into account, so the base station 30 does not require any treatment. That is, the sunset warning signal already output in step S11 is sufficient.
[0040]
FIG. 1 is a block diagram showing the main functions for the feedback availability determination process. In the figure, a GPS information notification unit 32, a battery remaining amount notification unit 33, and a warning display unit 34 are provided on the electric vehicle 1 side. The warning display unit 34 can be realized as a display screen of the mobile phone PH mounted on the electric vehicle 1, but a dedicated indicator (LCD or LED indicator lamp or the like) on or near the operation panel 5 of the electric vehicle 1. ) May be provided. The GPS information notification unit 32 notifies the base station 30 of data received by the GPS receiving circuit 31 or the GPS system of the mobile phone PH. The battery remaining amount notification unit 33 notifies the base station 30 of the remaining amount (battery voltage) of the battery 50 mounted on the vehicle 1.
[0041]
A current position calculation unit 35 is provided on the base station 30 side. The current position calculation unit 35 calculates the current position of the electric vehicle 1 based on the GPS information and the map data supplied from the map database 36. The battery remaining amount holding unit 37 receives the notification of the battery remaining amount and holds the value A of the battery remaining amount. The travelable distance calculation unit 38 calculates the travelable distance B of the electric vehicle 1 corresponding to the battery remaining amount A from the map (FIG. 9). The route distance search unit 39 calculates the route distance C from the current position to the home position registered in advance on the map database or by route search.
[0042]
The first determination unit 40 for determining whether or not to return can determine whether or not it is possible to return to the home position with a current battery level with a margin using the travelable distance B, the route distance C, the correction coefficient k1, and the margin value Z1. The specific determination method is shown in the flowchart.
[0043]
The sunset determination unit 41 determines whether it is possible to return to the home position by sunset using the current time, sunset time information, and route distance C. The return possibility determination unit 42 uses the travelable distance B, the route distance C, the correction coefficient k2 and the margin value Z2 to return to the home position with the current battery remaining amount and considering the lighting of the headlight after sunset. Determine if it is possible. The specific determination method is shown in the flowchart.
[0044]
The first feedback determination unit 40 and the second return determination unit 42 determine the margin to return to the home position under a predetermined condition, and output an alarm signal and an emergency warning signal according to the margin. Moreover, the sunset discrimination | determination part 41 outputs a sunset warning signal, when it discriminate | determines that it is impossible to return to a home position by sunset. The warning display unit 34 displays a scheduled warning in response to the warning signal, the emergency warning signal, and the sunset warning signal. The alarm display unit 34 is not limited to the electric vehicle 1, and may be provided in a preset report destination, for example, a facility or home where the electric vehicle 1 should return.
[0045]
In the above-described embodiment, an alarm is issued at the home position when there is less time until return due to the scheduled condition. A navigation function for guiding and guiding can also be added. For this guidance, it is preferable to transmit map data indicating the return route to the electric vehicle 1 at the same time when the various alarm signals are transmitted.
[0046]
In addition, communication between the electric vehicle 1 and the base station is not limited to the mobile phone PH, and other types of communication devices can be used.
[0047]
In addition, although the electric vehicle of this embodiment is a low speed and small thing, it is not restricted to this, The electric vehicle of another form may be sufficient. The number of wheels is not limited to four, and may be three. The shape of the steering handle 6 does not have to be a link projecting to the left and right, and may be a rod handle projecting to the left or right, or a round handle. In any case, the operation panel 5 may be disposed in front of the driver's seat, preferably above the steering post 4, and the mobile phone holder 21 may be installed in the vicinity of the operation panel 5.
[0048]
【The invention's effect】
As is apparent from the above description, according to the inventions of claims 1 to 12 , the base station can monitor the electric vehicle so that it cannot be returned to the planned home position. It is possible to reduce the psychological burden on the return time of the person concerned. In particular, the user of the electric vehicle is given an opportunity to return when his / her consciousness is low, and the person concerned and the like is easily notified because the state of the electric vehicle is transmitted.
[0049]
According to the first aspect of the present invention, the burden of monitoring the remaining battery level is reduced, which is psychologically easy. According to the fourth aspect of the present invention, the procedure for determining the route distance for determining whether or not to return can be simplified. According to the invention of claim 5 , the distance of the route suitable for the feedback such as the route with less battery consumption is determined. According to the sixth aspect of the present invention, it is possible to present a route suitable for return and guide it so that it can be returned efficiently.
[0050]
According to the first aspect of the invention, it is possible to recognize the timing at which the vehicle can return before sunset. According to the eighth aspect of the present invention, it is determined whether or not the vehicle can be returned in consideration of battery consumption corresponding to the lighting of the lamp. According to the tenth to twelfth aspects of the present invention, it is possible to easily realize the function of detecting the current position information and the function of communicating with the base station or the like by the mobile phone.
[Brief description of the drawings]
FIG. 1 is a block diagram showing main functions of a monitoring method of the present invention.
FIG. 2 is a perspective view of an electric vehicle according to an embodiment of the present invention.
FIG. 3 is a front view of a mobile phone holder.
FIG. 4 is a side view of the mobile phone holder.
FIG. 5 is a top view of the mobile phone holder.
FIG. 6 is a block diagram of a communication system.
FIG. 7 is a plan view of a steering handle provided in the electric vehicle according to the embodiment of the present invention.
FIG. 8 is a flowchart of a return possibility determination process.
FIG. 9 is a table showing the travelable distance B corresponding to the remaining battery charge A using the average load factor Cm of the motor as a parameter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Electric vehicle, 2 ... Body frame, 4 ... Steering post, 5 ... Operation panel, 6 ... Steering handle, 7R, 7L ... Winker lamp, 14 ... Winker switch, 30 ... Base station, 32 ... GPS information notification part, 33 ... Battery remaining amount notification part, 34 ... Warning display part, 35 ... Current position calculation part, 36 ... Map database, 38 ... Travelable distance calculation part, 39 ... Route distance search part, 40 ... Return determination possibility first determination part, 41 ... sunset discriminating part, 42 ... second return judging part

Claims (12)

In the monitoring method of the electric vehicle, the operation state of the electric vehicle having the communication means for transmitting the operation state including the remaining amount of the mounted battery and the current position to the base station is monitored by the base station.
The base station is
Detect the route distance from the current position of the electric vehicle to the planned return position,
When the remaining battery capacity is not enough to travel the route distance, it is predicted that there will be a problem in returning to the return position with a margin, and an alarm signal is sent to the scheduled report destination. ,
The base station comprises sunset time information,
A monitoring method for an electric vehicle, wherein a sunset warning signal is transmitted when it is predicted that sunset will occur while traveling on the route distance based on the moving speed and sunset time information of the electric vehicle.   The method for monitoring an electric vehicle according to claim 1, wherein the alarm signal is received and a warning is displayed at the report destination.   The method for monitoring an electric vehicle according to claim 2, wherein the report destination is the electric vehicle or a facility at the return position.   The method for monitoring an electric vehicle according to claim 1, wherein the route distance is a linear distance from a current position of the electric vehicle to the return position. The base station comprises a map database,
The method for monitoring an electric vehicle according to claim 1, wherein the route distance is determined by integrating the shortest distance of a road on which the electric vehicle can travel based on the map database.   6. The method for monitoring an electric vehicle according to claim 5, wherein a travel route that is a basis for determining the route distance is sent to the notification destination together with the warning signal.   The monitoring method for an electric vehicle according to claim 1, wherein the sunset warning signal is received and a sunset warning is displayed at the report destination.   In the case of predicting the sunset, it is predicted whether there is a problem in the return according to the remaining battery level in consideration of the power consumption of the lamp after the sunset. The method for monitoring an electric vehicle according to claim 1, wherein a signal is transmitted.   9. The method for monitoring an electric vehicle according to claim 8, wherein the emergency warning signal is received and an emergency warning is displayed at the report destination.   2. The method for monitoring an electric vehicle according to claim 1, wherein the communication means is a mobile phone equipped with a GPS function, and the alarm signal is received by the mobile phone.   The method for monitoring an electric vehicle according to claim 1, wherein the communication means is a mobile phone equipped with a GPS function, and the sunset warning signal is received by the mobile phone.   9. The method for monitoring an electric vehicle according to claim 8, wherein the communication means is a mobile phone equipped with a GPS function, and the emergency warning signal is received by the mobile phone.

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