A system and method for charging electric vehicles while driving

Abstract

A system and method for charging an electric vehicle while driving, comprising: laying a plurality of bar magnets with north and south poles pointing parallel to or tangent to the lane direction under a road surface including at least two lanes within a specified travel range, a plurality of coils under the vehicle and a vehicle-mounted satellite positioning device configured on the electric vehicle, a rotating control mechanism that prompts the driver whether to change lanes in response to the current remaining battery power, when the coils are placed horizontally, the interval between the coils is, when the coils are placed vertically, the interval is, and the interval between each of the bar magnets is matched to or according to the horizontal or vertical placement of the coils to obtain high charging efficiency. It is convenient for the driver to complete an efficient charging plan while driving according to the current remaining power, ensuring that the battery can have a good cycle life.

Description

[0001] This application is a divisional application of the Chinese patent application with application number 202310918556.8 filed on July 25, 2023, and invention name “A system and charging method for charging electric vehicles while driving”. Technical Field

[0002] The invention relates to a system for charging an electric vehicle, and in particular to a system and a charging method for charging an electric vehicle during driving. Background Art

[0003] Electric vehicles are new energy vehicles that replace fuel vehicles. The relationship between charging and battery life has become the most concerned topic for consumers to accept such products. Existing technologies achieve continuous battery life through the setting of charging piles and battery replacement services. However, consumers always think that this is an inconvenient charging method, and the popularity of charging piles is not high. Battery replacement is actually a prepayment of the total number of batteries that may be used in the life cycle of the car by consumers when buying a car, which is expensive. Therefore, how to consider low-cost and convenient charging methods has become an urgent problem to be solved.

[0004] Energy conversion is a feasible way to convert part of the car's kinetic energy into electrical energy, thus achieving a self-sufficient endurance strategy. That is, when you convert the amount of electricity you use into kinetic energy, you consider using the kinetic energy to convert it back into electrical energy at a certain conversion rate, thereby saving charging time and starting to charge while in use. In addition, you need to find out how to match the charging strategy with the remaining amount of power during charging, and how to maximize the battery life. Summary of the invention

[0005] In view of the above problems, the present invention provides a solution for charging an electric vehicle while driving, which mainly considers the following two aspects: first, the distribution of the magnetic field, and second, the optimal remaining power to start charging.

[0006] Based on the above considerations, the present invention provides a system for charging an electric vehicle while driving, comprising: laying a plurality of bar magnets with north and south poles pointing parallel to or tangential to the lane direction under a road surface including at least two lanes within a specified travel range; a plurality of coils under the vehicle and a vehicle-mounted satellite positioning device configured on the electric vehicle; a rotation control mechanism configured to prompt the driver whether to change lanes in response to the current remaining battery power, used to support the coil and allow the driver to manually choose whether to rotate the coil according to the prompt to form one of two states of horizontal or vertical placement, so as to obtain a high charging efficiency that matches the current remaining battery power, wherein the coils have a spacing of , when the coil is placed vertically, the interval is The interval between each of the bar magnets is matched according to the horizontal or vertical placement of the coil. or High charging efficiency is obtained, and the bar magnets with different corresponding matching intervals are laid alternately on different lanes (that is, the bar magnets in the same state on any lane must be different from the bar magnets in the lanes on both sides, that is, if the current lane is horizontal, the left and right lanes must be vertical, and vice versa), wherein The horizontal range of the bar magnet in the horizontal direction where the magnetic field B cannot be ignored is defined. B=0 is defined outside this horizontal range.

[0007] The alternating current on the coil is rectified by a corresponding rectifier bridge to charge the battery. The corresponding rectifier bridge includes a first rectifier bridge and a second rectifier bridge connected in parallel to the battery charging, which are respectively used to connect the coil in the horizontal and vertical states.

[0008] It should be noted that the electric car chassis is equipped with coils and the road is paved with permanent magnet strips. The spacing in the present invention refers to the spacing between the coils or bar magnets, rather than the distance between any corresponding points on each.

[0009] Optionally, the prescribed journey is 10-50 km.

[0010] Optionally, the rotation control mechanism includes a coil sleeve arranged outside the coil, an extended gear shaft on which a gear is set or an extended pulley shaft on which a pulley is set extending from the coil sleeve, which drives the gear to rotate through a chain or drives the pulley to rotate through a belt, thereby driving the coil sleeve to rotate to switch the two states of the coil, and a processor for responding to the remaining power and receiving the current lane information determined by the vehicle-mounted satellite positioning device, thereby deciding whether to execute the step of prompting the driver, and controlling the switching operation according to the driver's choice of whether to change lanes, wherein the lane information includes the spacing of the bar magnets in the lane.

[0011] Optionally, whether the driver chooses to change lanes is determined based on whether the turn signal lamp is activated or not. If activated, it is determined as a choice, otherwise it is not a choice.

[0012] Optionally, when the driver does not choose to change lanes according to the prompt, the rotary control mechanism maintains the current state of the coil and the prompt; when the driver chooses to change lanes according to the prompt, the rotary control mechanism changes the state of the coil and terminates the prompt within a preset time.

[0013] Preferably, the preset time is 3-10s.

[0014] When the driver does not turn on the turn signal but actually changes lanes according to the prompt, the on-board satellite positioning device causes the rotation control mechanism to perform the switching operation and terminate the prompt based on the newly determined lane information after the lane change.

[0015] Preferably, the vehicle-mounted satellite positioning device determines the positioning with the aid of BeiDou-3 navigation and positioning satellite.

[0016] It is understandable that when the current remaining power does not match the interval of the bar magnets corresponding to the lane determined by positioning, the step of prompting the driver is initiated. The driver decides whether to change lanes based on the lane change conditions and his own will, so as to change to a lane where the bar magnet state matches the current remaining power.

[0017] Optionally, the vehicle-mounted satellite positioning device determines the current lane information every 10s-1min, and then the rotation control mechanism decides whether to execute the step of prompting the driver.

[0018] Preferably, the two ends of the coil have extended electromagnetic shielding leads, the first rectifier bridge and the second rectifier bridge each have a group of contact strips led out from two terminals (a group of contact strips has two contact strips), and when the rotation control mechanism alternately switches the state of the coil, the electromagnetic shielding leads can be alternately connected to a group of contact strips corresponding to the first rectifier bridge or the second rectifier bridge.

[0019] Optionally, the first rectifier bridge and the second rectifier bridge each have a group of contact strips led out from two terminals, and at least one group has contact branches for overlapping the electromagnetic shielding leads extending from the two ends of the coil.

[0020] After a coil passes through the horizontal range i, the equivalent charging current when the coil is placed horizontally is (1), where is a coefficient less than 1, is the number of coil turns, is the peak value of the magnetic flux wave, the first equivalent magnetic field uniform intensity ,in The circumscribed rectangle of each magnetic field line of the magnetic strip forms the magnetic field strength in the vertical direction of the outermost rectangular magnetic field line of the simulated magnetic field. The horizontal side distance of the outermost rectangular magnetic field line of the simulated magnetic field is The magnitude of the magnetic field strength in the vertical direction of the rectangular magnetic field lines, During the cutting process, the projection of the horizontal rectangular cross section of the magnetic strip on one wire of the coil is perpendicular to the vehicle speed. The length of the conductor in the direction, where the actual field strength at the point of intersection between the magnetic lines of force of the magnetic strip and the circumscribed rectangle is taken as the field strength at each point on the edge of the rectangle where the point of intersection is located;

[0021] By measuring the equivalent charging current (2) and (3) Calculation and control parameters The method is as follows: obtain the equivalent voltage through the measured voltage waveform of vehicles at different speeds, and use the coil resistance According to Ohm's law, multiple corresponding measured equivalent current values ​​are calculated and linearly fitted by formulas (2) and (3) to obtain and ;

[0022] When the coil is placed vertically, the equivalent charging current is (4), so , it is inferred (5),

[0023] Among them, the second equivalent magnetic field uniform intensity , peak value of magnetic flux wave , The horizontal side distance of the outermost rectangular magnetic field line of the simulated magnetic field is The magnetic field strength in the vertical direction of the rectangular magnetic field lines is obtained to obtain the equivalent number of turns. The method is as follows: by measuring the equivalent charging current (6) Calculation of control parameters , substituting into formula (4) we get (7) Obtain the equivalent voltage by measuring the voltage waveform of vehicles at different speeds, and use According to Ohm's law, multiple corresponding measured equivalent current values ​​are obtained by linear fitting. ,in The calculation method is as follows: obtain the equivalent voltage through the measured voltage waveform of vehicles at different speeds, and use the coil resistance According to Ohm's law, multiple corresponding measured equivalent current values ​​are calculated and linearly fitted by formula (6) to obtain , It is the vertical height when the normal line of the coil cross section is perpendicular to the ground.

[0024] Preferably, the two equivalent power generation current calculation methods in formula (1) and (4) are respectively arithmetic averaged to obtain (8), according to the fitting and Substituting into formula (8) we can obtain ,as well as (9), where , .

[0025] like Figure 1 As shown, if the vehicle speed As the horizontal coordinate, the equivalent charging current as the vertical coordinate, establish a coordinate system. When the coil is placed horizontally and vertically, according to formulas (1) and (4), since the slopes can be different or the same, there are two situations where the equivalent charging current straight line function intersects or overlaps with the origin of the coordinate system (a and b). , ,and and Although both are greater than 2, and is larger, but the difference between the two is not too big. Therefore, in the end, we can only calculate which slope is larger, horizontal or vertical. This depends on That is, the coil and The design size of the rear floor affects the height of the rear floor, which in turn affects the passenger experience. Therefore, it is necessary to comprehensively consider the coil among these factors. and The design size is reasonable The degree of the horizontal or vertical slope is finally determined. However, to obtain the parallel state, the values ​​of each parameter need to be calculated to obtain the appropriate value, which is difficult. Therefore, almost all coils are designed so that the equivalent charging current linear function does not overlap.

[0026] The remaining power of the current battery is different, so the required charging rate is also different. For example, if the power is low, the driver is required to charge quickly. Otherwise, a relatively slow charging is required.

[0027] Assume the battery capacity is (dimension Ah), so when the remaining power is less than the predetermined amount hour, , then take the corresponding coil state with a larger slope of the equivalent charging current linear function, otherwise , there is still power left When the slope of the equivalent charging current linear function is smaller, the corresponding coil state is taken. In both cases, the interval between the matching lane bar magnets is taken as the interval corresponding to the corresponding coil state. If the interval of the bar magnets in the current lane does not match the interval corresponding to the corresponding coil state, the rotation control mechanism will prompt the driver to change lanes.

[0028] A method for charging an electric vehicle while driving using the aforementioned system includes the following steps after the electric vehicle enters a lane:

[0029] S1 Every 10s-1min, the rotation control mechanism obtains the remaining power and the vehicle-mounted satellite positioning device to determine the current lane, thereby deciding whether to execute the step of prompting the driver;

[0030] S2 When the battery capacity is (dimension Ah), so when the remaining power is less than the predetermined amount hour, , then take the corresponding coil state with a larger slope of the equivalent charging current linear function, otherwise , there is still power left When the equivalent charging current linear function slope is smaller, the corresponding coil state is taken, and in both cases, the interval between the matching lane bar magnets is taken as the interval corresponding to the corresponding coil state. If the interval of the bar magnets in the current lane does not match the interval corresponding to the corresponding coil state, the rotation control mechanism will prompt the driver to change lanes, and no prompt will be given when matching;

[0031] S3: when the driver does not choose to change lanes according to the prompt, the rotary control mechanism maintains the current state of the coil and the prompt; when the driver chooses to change lanes according to the prompt, the rotary control mechanism changes the state of the coil and terminates the prompt within a preset time;

[0032] S4 repeats steps S1-S3 until the specified travel is completed and charging is terminated.

[0033] Preferably, the preset time is 3-10s.

[0034] Optionally, the driver's choice of whether to change lanes is determined based on whether the turn signal is activated or not. If it is activated, it is determined as a choice, otherwise it is not a choice. When the turn signal is turned on, the rotary control mechanism controls the coil to change the state of the coil within a preset time to complete the state switching operation. When the driver does not turn on the turn signal but actually changes lanes according to the prompt, the on-board satellite positioning device causes the rotary control mechanism to execute the switching operation and terminate the prompt based on the newly determined lane information after the lane change.

[0035] Optionally, the charging method further includes the following steps which are performed independently of steps S1 to S4:

[0036] P1 performs cycle life tests when charging to 95% based on multiple remaining power levels done in advance, and prompts the driver whether to start charging after entering the charging lane based on the current remaining power;

[0037] P2 If the driver does not manually start the charging program, the system will independently determine whether to start charging. Otherwise, the system will start charging based on the driver's manual start.

[0038] The cycle life test includes the following steps:

[0039] P1-1 selects multiple batteries from each experimental group with remaining power greater than 60%, 60%-40%, 40%-20%, 20%-10%, and less than 10%;

[0040] P1-2 Perform multiple battery cycles to perform a cyclic charge-discharge experiment where the battery is charged to 95% and then discharged to the power before charging, so as to ultimately determine the average battery cycle life of each group;

[0041] P1-3 selects the remaining power group with the longest average cycle life as the charging threshold range.

[0042] Prompting the driver whether to start charging after entering the charging lane based on the current remaining power in P1 further includes: the processor of the rotating control mechanism compares whether the current remaining power falls within the charging threshold range; when it falls within the charging threshold range or is less than the charging threshold range, the driver is prompted whether to start charging after entering the charging lane; when the remaining power is greater than the charging threshold range, the driver is not prompted whether to start charging after entering the charging lane, and the driver can freely choose or not to manually start the charging procedure.

[0043] In P2, the system independently determines whether to start charging, specifically, when the remaining power falls within the charging threshold range or is less than the charging threshold range, the system independently determines to start charging and starts the charging program.

[0044] Optionally, when the on-board satellite positioning device determines that the current lane is 100-1000 m before the charging lane, step P1 is executed.

[0045] Optionally, the charging start procedure is controlled by controlling whether the coil is shielded by an electromagnetic shielding plate that is movably arranged directly below the coil to shield the magnetic field.

[0046] Preferably, the driver can freely choose to pause, restart, or terminate the charging program at any time based on the current remaining power. Once the charging program is terminated, it cannot be restarted. After leaving the charging lane, the system automatically terminates the charging program.

[0047] Beneficial Effects

[0048] 1. By setting the intervals between lane bar magnets, charging lanes with different intervals of bar magnets that are alternately adjacent to each other are formed, so that the driver can complete an efficient charging plan while driving according to the current remaining power.

[0049] 2. It is possible to determine whether to charge based on the charging threshold range of the cycle life test, ensuring that the battery can have a good cycle life. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1Schematic diagram of the DC function image of the equivalent charging current after passing through range i when the coil is placed horizontally and vertically.

[0051] Figure 2 Schematic diagram of the layout of bar magnets in a system for charging electric vehicles while in motion.

[0052] Figure 3 The circuit diagram of the underbody coil state switching and rectifier bridge charging circuit in the system for charging electric vehicles while driving.

[0053] Figure 4 Schematic diagram of the structure of the rotation control mechanism excluding the processor in the system for charging an electric vehicle while driving.

[0054] Figure 5 Rectifier bridge structure diagram,

[0055] Figure 6 Flow chart of the charging method in Embodiment 2 of the present invention,

[0056] Figure 7 Flow chart of the charging method in embodiment 3 of the present invention,

[0057] Figure 8 This is a schematic diagram of the configuration between the bar magnets laid on the road and the coils on the vehicle in Example 4 of the present invention.

[0058] The reference numerals in the figures are: 3, battery; 7, power inverter; and 8, on-board electrical equipment. DETAILED DESCRIPTION

[0059] Example 1

[0060] like Figure 2 As shown, a system for charging an electric vehicle while driving includes a variable dual lane in the same direction as an example, each of which is distributed with bar magnets with intervals of i+L and i, and the vehicle speed direction is pointing to the S pole. The system also includes the following Figure 3 The electric vehicle is provided with three coils on the bottom of the vehicle and a vehicle-mounted satellite positioning device (not shown in the figure). Figure 3 and 4 As shown, a rotation control mechanism is configured to prompt the driver whether to change lanes in response to the current remaining battery power, and is used to support the coil and allow the driver to manually choose whether to rotate the coil according to the prompt to form a horizontal or vertical position (see Figure 2 The battery can be placed in one of two states (a horizontal state in the direction of the arrow and a vertical state in the direction of the arrow) and prompt the driver whether to change lanes to obtain high charging efficiency that matches the current remaining battery power.

[0061] Electromagnetic shielding leads are extended from both ends of the coil, and the alternating current on the coil is rectified by the corresponding first rectifier bridge and the second rectifier bridge to charge the battery 3, and the power inverter 7 output by the battery 3 is converted into a universal AC power supply to supply power to various on-board electrical equipment 8 (including the rotation control mechanism).

[0062] like Figure 3 As shown, the first rectifier bridge and the second rectifier bridge each have a group of contact strips led out from two terminals (a group of contact strips has two contact strips), when the rotation control mechanism alternately switches the state of the coil (forming two states of horizontal spacing i and vertical spacing i+L), the electromagnetic shielding lead wire can alternately overlap a group of contact strips corresponding to the first rectifier bridge or the second rectifier bridge. At least one of the groups of contact strips led out from two terminals of the first rectifier bridge and the second rectifier bridge has contact branches for overlapping the electromagnetic shielding lead wires corresponding to the extensions of the two ends of the coil.

[0063] like Figure 4 As shown, the rotation control mechanism includes a coil sleeve ( Figure 4 Taking one coil as an example), the gear shaft extending from the coil sleeve is provided with a gear, and the gear is driven to rotate through a chain, thereby driving the coil sleeve to rotate (three coil sleeves rotate in conjunction with each other for three coils) to switch between the two states of the coil, and a processor (not shown) is used to respond to the remaining power and receive the current lane information determined by the vehicle-mounted satellite positioning device, so as to determine whether to execute the step of prompting the driver, and control the switching operation according to the driver's choice of whether to change lanes, wherein the lane information includes the interval between the bar magnets in the lane.

[0064] like Figure 5 As shown, the rectifier bridge of this embodiment may include a chip and four NMOS tubes. The chip includes pins T1, T2, T3 and T4 respectively connected to the output ends of each NMOS tube and two input terminals A and B. That is, if A is positive and B is negative, then T1 and T4 are turned on, and T2 and T3 are turned off. If A is negative and B is positive, then T2 and T3 are turned on, and T1 and T4 are turned off. In this way, point C always outputs a positive voltage, and point D outputs a negative voltage. After filtering and voltage stabilization, the battery can be safely charged.

[0065] Example 2

[0066] like Figure 6 As shown, a method for charging an electric vehicle while driving using the aforementioned system includes the following steps after the electric vehicle enters a lane:

[0067] S1 Every 10 seconds, the rotation control mechanism obtains the remaining power and the vehicle-mounted satellite positioning device to determine the current lane, thereby deciding whether to execute the step of prompting the driver;

[0068] S2 When the battery capacity is (dimension Ah), so when the remaining power is less than the predetermined amount hour, , then take the corresponding coil state with a larger slope of the equivalent charging current linear function, otherwise , there is still power left When the equivalent charging current linear function slope is smaller, the corresponding coil state is taken, and in both cases, the interval between the matching lane bar magnets is taken as the interval corresponding to the corresponding coil state. If the interval of the bar magnets in the current lane does not match the interval corresponding to the corresponding coil state, the rotation control mechanism will prompt the driver to change lanes, and no prompt will be given when matching;

[0069] S3: When the driver does not choose to change lanes according to the prompt, the rotary control mechanism maintains the current state of the coil and the prompt; when the driver chooses to change lanes according to the prompt, the rotary control mechanism changes the state of the coil and terminates the prompt within 3 seconds;

[0070] S4 repeats steps S1-S3 until the specified travel is completed and charging is terminated.

[0071] The driver's choice of whether to change lanes is determined based on whether the turn signal is turned on or not. If it is turned on, it is determined as a choice, otherwise it is not a choice. When the turn signal is turned on, the rotation control mechanism controls the coil to change the state of the coil within a preset time to complete the state switching operation. When the driver does not turn on the turn signal but actually changes lanes according to the prompt, the on-board satellite positioning device causes the rotation control mechanism to execute the switching operation and terminate the prompt based on the newly determined lane information after the lane change.

[0072] Example 3

[0073] The charging method of embodiment 2 further includes the following steps which are performed independently of steps S1-S4: when the vehicle-mounted satellite positioning device determines that the current lane is 500m before the charging lane, executing step P1 to perform a cycle life test when charging to 95% based on multiple remaining power levels performed in advance, and prompting the driver whether to start charging after entering the charging lane based on the current remaining power;

[0074] P2 If the driver does not manually start the charging program, the system will independently determine whether to start charging. Otherwise, the system will start charging based on the driver's manual start.

[0075] Among them, Figure 7 As shown, the cycle life test includes the following steps:

[0076] P1-1 selects multiple batteries from each experimental group with remaining power greater than 60%, 60%-40%, 40%-20%, 20%-10%, and less than 10%;

[0077] P1-2 Perform multiple battery cycles to perform a cyclic charge-discharge experiment where the battery is charged to 95% and then discharged to the power before charging, so as to ultimately determine the average battery cycle life of each group;

[0078] P1-3 selects the remaining power group with the longest average cycle life as the charging threshold range.

[0079] Prompting the driver whether to start charging after entering the charging lane based on the current remaining power in P1 further includes: the processor of the rotating control mechanism compares whether the current remaining power falls within the charging threshold range; when it falls within the charging threshold range or is less than the charging threshold range, the driver is prompted whether to start charging after entering the charging lane; when the remaining power is greater than the charging threshold range, the driver is not prompted whether to start charging after entering the charging lane, and the driver can freely choose or not to manually start the charging procedure.

[0080] In P2, the system independently determines whether to start charging, specifically, when the remaining power falls within the charging threshold range or is less than the charging threshold range, the system independently determines to start charging and starts the charging program.

[0081] The coil is shielded by an electromagnetic shielding plate that can be movably arranged directly below the coil ( Figure 2 (not shown) whether to block the coil to shield the magnetic field and start the charging procedure.

[0082] The driver can freely choose to pause, restart, or terminate the charging process at any time based on the current remaining power. Once the charging process is terminated, it cannot be restarted. After leaving the charging lane, the system automatically terminates the charging process.

[0083] Example 4

[0084] This embodiment is based on the embodiment 1, and takes into account the greater charging efficiency and charging voltage. More bar magnets (for example, 3 rows) are arranged side by side on each charging path, and the width of the coil is considered to be 1-1.5m. In this way, the coil cuts the magnetic lines of more bar magnets, such as Figure 8 The average charging voltage of each range i can be obtained by multiplying the number of parallel connections by formula (1), (4) or (8), (9). Then multiply it by the coil resistance to estimate. That is, the average charging voltage is obtained by formula (1) and (4). (10) (11), and the average charging voltage is obtained by formulas (8) and (9): (12) (13).

[0085] It can be seen that the charging voltage is related to the driving speed, number of turns, number of bar magnets in parallel or coil parameters. , and the magnetic field strength of the bar magnet have an increasing functional relationship.

Claims

1. A system for charging an electric vehicle while driving, characterized in that: The invention comprises: laying a plurality of bar magnets with north and south poles pointing parallel to or tangential to the lane direction under a road surface including at least two lanes within a specified travel range; a plurality of coils under the vehicle and a vehicle-mounted satellite positioning device are arranged on the electric vehicle; a rotation control mechanism is arranged to prompt the driver whether to change lanes in response to the current remaining battery power; the rotation control mechanism is used to support the coil and to allow the driver to manually choose whether to change lanes according to the prompt, and then rotate the coil to form one of two states of horizontal or vertical placement, so as to obtain a high charging efficiency matching the current remaining battery power, wherein there is a gap between the coils when the coils are horizontally placed. , when the coil is placed vertically, the interval is The interval between each of the bar magnets is matched according to the horizontal or vertical placement of the coil. or High charging efficiency is obtained, and the bar magnets with different corresponding matching intervals are laid alternately on different lanes, wherein The horizontal range of the bar magnet in the horizontal direction where the magnetic field B cannot be ignored is defined. B=0 is defined outside this horizontal range. The alternating current on the coil is rectified by a corresponding rectifier bridge to charge the battery, and the corresponding rectifier bridge includes a first rectifier bridge and a second rectifier bridge connected in parallel to the battery charging, which are respectively used to connect the coil in the horizontal and vertical states; The electric vehicle chassis is provided with a coil, and a permanent magnet bar is laid on the road. The rotation control mechanism includes a coil sleeve mounted outside the coil, an extended gear shaft with a gear or an extended pulley shaft with a pulley extending from the coil sleeve, the gear is rotated by a chain or the pulley is rotated by a belt, thereby driving the coil sleeve to rotate to switch the two states of the coil, and a processor is used to respond to the remaining power and receive the current lane information determined by the vehicle-mounted satellite positioning device, so as to decide whether to execute the step of prompting the driver, and control the switching operation according to the driver's choice of whether to change lanes, wherein the lane information includes the interval of the bar magnets in the lane.

2. The system according to claim 1, characterized in that The prescribed journey is 10-50 km.

3. The system according to claim 1, characterized in that The driver's choice of whether to change lanes is determined based on whether the turn signal lamp is activated or not. If activated, it is determined as a choice, otherwise, it is not a choice.

4. The system according to claim 3, characterized in that When the driver does not choose to change lanes according to the prompt, the rotary control mechanism maintains the current state of the coil and the prompt; when the driver chooses to change lanes according to the prompt, the rotary control mechanism changes the state of the coil and terminates the prompt within a preset time.

5. The system according to claim 3, characterized in that When the driver does not turn on the turn signal but actually changes lanes according to the prompt, the on-vehicle satellite positioning device causes the rotation control mechanism to perform the switching operation and terminate the prompt based on the newly determined lane information after the lane change; The vehicle-mounted satellite positioning device determines the positioning with the help of the Beidou-3 navigation and positioning satellite.

6. The system according to claim 5, characterized in that Every 10 seconds to 1 minute, the vehicle-mounted satellite positioning device determines the current lane information, and then the rotation control mechanism decides whether to execute the step of prompting the driver.

7. The system according to any one of claims 1 to 6, characterized in that: The coil has extended electromagnetic shielding leads at both ends, and the first rectifier bridge and the second rectifier bridge each have a group of contact strips extending from two terminals. When the rotation control mechanism alternately switches the state of the coil, the electromagnetic shielding leads can be alternately connected to a group of contact strips corresponding to the first rectifier bridge or the second rectifier bridge.

8. The system according to claim 7, characterized in that More bar magnets are arranged side by side on each charging road, and the L range of the coils installed under the vehicle is 1-1.5m.

9. A method for charging an electric vehicle while driving using the system according to any one of claims 1 to 7, characterized in that: After the electric vehicle enters a lane, the following steps are performed: S1. Every 10 seconds to 1 minute, the rotation control mechanism obtains the remaining power and the onboard satellite positioning device to determine the current lane, thereby deciding whether to execute the step of prompting the driver; S2, when the battery capacity is , dimension Ah, so when the remaining power is less than the predetermined amount hour, , then take the corresponding coil state with a larger slope of the equivalent charging current linear function, otherwise , there is still power left When the equivalent charging current linear function slope is smaller, the corresponding coil state is taken, and in both cases, the interval between the matching lane bar magnets is taken as the interval corresponding to the corresponding coil state. If the interval of the bar magnets in the current lane does not match the interval corresponding to the corresponding coil state, the rotation control mechanism will prompt the driver to change lanes, and no prompt will be given when matching; S3, when the driver does not choose to change lanes according to the prompt, the rotation control mechanism maintains the current state of the coil and the prompt; When the driver chooses to change lanes according to the prompt, the rotary control mechanism changes the state of the coil within a preset time and terminates the prompt; S4. Repeat steps S1-S3 until the specified journey is completed and charging is terminated.

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