KR20230100478A - Method and apparatus for wireless charging between electric vehicles - Google Patents

Abstract

The present invention relates to a method for wireless charging between electric vehicles and an apparatus thereof. The method for the wireless charging between the electric vehicles according to one embodiment comprises the following steps of: setting up, when another electric vehicle equipped with a wireless charging receiving pad is located a predetermined distance away, a communication network between the electric vehicle and a vehicle; activating a battery sharing mode when the other electric vehicle is authenticated through a vehicle-to-vehicle communication network; and controlling a battery power to be transmitted to the wireless charging receiving pad of the other electric vehicle through the wireless charging receiving pad. Provided is a computer-readable recording medium on which a program for executing the method on a computer is recorded.

Description

Method and apparatus for wireless charging between electric vehicles {Method and apparatus for wireless charging between electric vehicles}

The present invention relates to a method and apparatus for wireless charging between electric vehicles.

An electric vehicle means a vehicle operated using electricity, and can be largely classified into a battery powered electric vehicle and a hybrid electric vehicle. A pure electric vehicle is a vehicle that runs using only electricity, and a hybrid electric vehicle is a vehicle that runs using electricity and fossil fuel.

An electric vehicle is equipped with a battery that supplies electricity for driving. In particular, a pure electric vehicle and a plug-in hybrid electric vehicle charge a battery using power supplied from an external power source and drive an electric motor using the power charged in the battery. In order to expand the supply of electric vehicles (EVs), it is essential to build a charging infrastructure that can charge electric vehicles. In particular, increasing the capacity of the battery of the electric vehicle has the disadvantage of increasing the weight of the vehicle body, and thus the driving distance of the electric vehicle with one full charge is inevitably limited.

Therefore, for mid- to long-distance operation of electric vehicles, it is essential to install charging stations linked to the road network so that electric vehicles can be charged anytime, anywhere, and to have charging facilities and infrastructure at home is also necessary to expand the spread of electric vehicles (EVs). It is absolutely necessary.

Charging of electric vehicles consists of slow-type charging facilities and rapid-type charging facilities, and in the case of rapid-type charging facilities, they are installed at charging stations dedicated to electric vehicles. The rapid charging facility is a charging station with a maximum output of 50 kW or more, and can complete charging within 30 minutes by directly charging the battery with the supply of DC power. In the case of a slow charging facility, the maximum output of the charging device is 7.7kW or less, and it takes about 6 to 8 hours to charge by charging with the OBC (OnBoard Charger) in the electric vehicle by supplying AC power.

However, the lack of charging infrastructure, including charging stations, along with the battery capacity and mileage of electric vehicles is a major factor hindering the spread of electric vehicles.

[Prior art document number]

Prior Art 1: Korean Patent Registration No. 10-2277826

An embodiment is to provide a method and apparatus for wireless charging between electric vehicles. In addition, it is to provide a computer-readable recording medium recording a program for executing the method on a computer. The technical problem to be solved is not limited to the technical problems described above, and other technical problems may exist.

A wireless charging method between electric vehicles according to an embodiment includes the steps of setting a communication network between an electric vehicle and a vehicle when another electric vehicle equipped with a wireless charging receiving pad is located at a predetermined distance; activating a battery sharing mode when the other electric vehicle is authenticated through the vehicle-to-vehicle communication network; and controlling the power of the battery to be transmitted to the wireless charging receiving pad of the other electric vehicle through the wireless charging transmitting pad.

In the wireless charging method between electric vehicles, when the battery sharing mode is activated, power of the battery may be transmitted to the wireless charging receiving pad of the other electric vehicle according to a user selection signal.

The wireless charging method between electric vehicles may further include determining whether the remaining amount of the battery is greater than or equal to a threshold value, and when the remaining amount of the battery is greater than or equal to the threshold value, the battery sharing mode may be activated.

In the wireless charging method between electric vehicles, vehicle information of the other electric vehicle may be received through the vehicle-to-vehicle communication network, and the other electric vehicle may be authenticated based on the received vehicle information.

In the wireless charging method between electric vehicles, when wireless charging to the other electric vehicle is terminated, charging completion information may be transmitted to an external server.

A wireless charging device between electric vehicles according to another embodiment includes a wireless charging transmission pad for transmitting power stored in a battery to the outside; and when another electric vehicle equipped with a wireless charging reception pad is located at a predetermined distance, a communication network between the electric vehicle and the vehicle is set, and when the other electric vehicle is authenticated through the vehicle-to-vehicle communication network, a battery sharing mode is activated. and a processor for controlling the power of the battery to be transmitted to the wireless charging receiving pad of the other electric vehicle through the wireless charging transmitting pad.

When the battery sharing mode is activated, the wireless charging device between electric vehicles may receive a user selection signal through a user interface of an In Vehicle Infotainment (IVI) device.

The processor may determine whether the remaining amount of the battery is greater than or equal to a threshold value, and when the remaining amount of the battery is greater than or equal to the threshold value, the battery sharing mode may be activated.

The processor may receive vehicle information of the other electric vehicle through the vehicle-to-vehicle communication network and authenticate the other electric vehicle based on the received vehicle information.

1 is a block diagram of the interior of a vehicle;
FIG. 2 is a block diagram of the vehicle driving assistance system (ADAS) shown in FIG. 1 .
3 to 6 are diagrams for explaining wireless charging of an electric vehicle.
7 is an exemplary diagram for explaining wireless charging between electric vehicles according to an embodiment.
8 is a schematic diagram for explaining a wireless charging device between electric vehicles according to an embodiment.
9 is a flowchart illustrating a wireless charging method between electric vehicles according to another embodiment.

The terms used in this specification will be briefly described, and the present invention will be described in detail.

The terms used in the present invention have been selected from general terms that are currently widely used as much as possible while considering the functions in the present invention, but they may vary depending on the intention or precedent of a person skilled in the field, the emergence of new technologies, and the like. In addition, in a specific case, there is also a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the invention. Therefore, the term used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, not simply the name of the term.

When it is said that a certain part "includes" a certain component throughout the specification, it means that it may further include other components without excluding other components unless otherwise stated. In addition, terms such as "...unit" and "module" described in the specification mean a unit that processes at least one function or operation, which may be implemented as hardware or software or a combination of hardware and software. .

An electric vehicle (EV) may refer to an automobile defined in 49 code of federal regulations (CFR) 523.3 or the like. The electric vehicle can be used on highways and driven by electricity supplied from an energy storage device mounted on the electric vehicle, such as a rechargeable battery, from a power source outside the electric vehicle. The power supply source may include a residence, a public electric service, or a generator using fuel mounted on an electric vehicle.

An electric vehicle (EV) may be referred to as an electric car, an electric automobile, an electric road vehicle (ERV), a plug-in vehicle (PV), a plug-in vehicle (xEV), and the like. xEV is BEV (plug-in all-electric vehicle or battery electric vehicle), PEV (plug-in electric vehicle), HEV (hybrid electric vehicle), HPEV (hybrid plug-in electric vehicle), PHEV (plug-in hybrid electric vehicle), etc., or may be classified.

A plug-in electric vehicle (PEV) may be referred to as an electric vehicle that recharges an onboard primary battery by connecting to a power grid.

A plug-in vehicle (PV) may be referred to herein as a rechargeable electric vehicle through a wireless charging method without using a physical plug and socket from an electric vehicle supply equipment (EVSE).

Heavy duty vehicles (H.D. Vehicles) may refer to any electric vehicle with four or more wheels as defined in 49 CFR 523.6 or CFR 37.3 (bus).

Light duty plug-in electric vehicles are three or four wheels propelled by an electric motor supplied with current from a rechargeable battery or other energy device, primarily for use on public streets, roads and highways. It can refer to an electric vehicle with A lightweight plug-in electric vehicle can be specified with a total weight of less than 4.545 kg.

A wireless power charging system (WCS) may refer to a system for wireless power transfer and control between a GA and a VA including alignment and communication. Wireless power transfer (WPT) may refer to transmission of electrical power through a contactless means from an alternating current (AC) power supply network such as a utility or a grid to an electric vehicle.

An inductive charging system may refer to a system that transfers energy electromagnetically in the forward direction from an electrical supply network to an electric vehicle through a transformer in which two parts are loosely coupled. In this embodiment, the inductive charging system may correspond to an electric vehicle charging system. An inductive coupler may refer to a transformer formed of a GA coil and a VA coil to transmit power through electrical isolation.

Inductive coupling may refer to magnetic coupling between two coils. The two coils may refer to a ground assembly coil and a vehicle assembly coil.

Ground assembly (GA) may refer to an assembly that is disposed on the ground or infrastructure side, including the GA coil and other suitable components. Other suitable components may include at least one component for controlling impedance and resonant frequency, ferrite and electromagnetic shielding material for enhancing a magnetic path. For example, a GA may include a power/frequency conversion device necessary to function as a power source for a wireless charging system, a GA controller, and wiring from the grid and wiring between each unit and filtering circuits, housing, and the like.

Vehicle assembly (VA) may refer to an assembly that is placed in a vehicle, including a VA coil and other suitable components. Other suitable components may include at least one component for controlling impedance and resonant frequency, ferrite and electromagnetic shielding material for strengthening the magnetic path. For example, the VA may include wiring between each unit and filtering circuits, housing, etc., as well as wiring of the rectifier/power converter and VA controller and vehicle battery necessary to function as a vehicle component of the wireless charging system. .

Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings.

1 is an internal block diagram of an electric vehicle according to an embodiment.

Referring to FIG. 1 , an electric vehicle 100 includes a communication unit 110, an input unit 120, a sensing unit 125, a memory 130, an output unit 140, an electric vehicle driving unit 150, and an electric vehicle driving assistance system (ADAS). , 160), a control unit 170, an interface unit 180, and a power supply unit 190.

The communication unit 110 may include a short-range communication module, a location information module, an optical communication module, and a V2X communication module.

The input unit 120 may include a driving control unit, a camera, a microphone, and a user input unit.

The driving control unit receives a user input for driving the electric vehicle 100 . The driving control unit may include a steering input unit, a shift input unit, an acceleration input unit, and a brake input unit.

The acceleration input unit receives an input for acceleration of the electric vehicle 100 from a user. The brake input unit receives an input for decelerating the electric vehicle 100 from the user.

The camera may include an image sensor and an image processing module. The camera may process still images or moving images obtained by an image sensor (eg, CMOS or CCD). The image processing module may process a still image or video obtained through an image sensor, extract necessary information, and deliver the extracted information to the controller 170 .

Meanwhile, the electric vehicle 100 may include a front camera that captures a front image of the electric vehicle, an around view camera that captures an image around the electric vehicle, and a rear camera that captures a rear image of the electric vehicle. Each camera may include a lens, an image sensor and a processor. The processor may computer-process the photographed image to generate data or information, and transmit the generated data or information to the controller 170 . A processor included in the camera may be controlled by the controller 170 .

The camera may include a stereo camera. In this case, the processor of the camera may use a disparity difference detected in the stereo image to detect a distance to the object, a relative speed to the object detected in the image, and a distance between a plurality of objects.

The camera may include a Time of Flight (TOF) camera. In this case, the camera may include a light source (eg, infrared or laser) and a receiver. In this case, the processor of the camera detects the distance to the object, the relative speed to the object, and the distance between the plurality of objects based on the time (TOF) until infrared rays or lasers emitted from the light source are reflected and received by the object. can do.

Meanwhile, the rearview camera may be disposed near the rear license plate or trunk or tailgate switch, but the rearview camera is not limited thereto.

Each image captured by the plurality of cameras is transmitted to a processor of the camera, and the processor may synthesize the respective images to generate an image around the electric vehicle. In this case, the image around the electric vehicle may be displayed through the display unit as a top view image or a bird's eye image.

The sensing unit 125 senses various conditions of the electric vehicle 100 . To this end, the sensing unit 125 includes a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight sensor, a heading sensor, a yaw sensor, and a gyro sensor. , position module, electric vehicle forward/backward sensor, battery sensor, fuel sensor, tire sensor, steering sensor by steering wheel rotation, electric vehicle internal temperature sensor, electric vehicle internal humidity sensor, ultrasonic sensor, illuminance sensor, radar, lidar, etc. can include

Accordingly, the sensing unit 125 provides electric vehicle collision information, electric vehicle direction information, electric vehicle location information (GPS information), electric vehicle angle information, electric vehicle speed information, electric vehicle acceleration information, electric vehicle tilt information, electric vehicle forward/backward information, and battery information. , fuel information, tire information, electric vehicle lamp information, electric vehicle internal temperature information, electric vehicle internal humidity information, steering wheel rotation angle, and electric vehicle external illuminance.

The memory 130 is electrically connected to the controller 170 . The memory 130 may store basic data for the unit, control data for controlling the operation of the unit, and input/output data. The memory 130 may be a variety of storage devices such as ROM, RAM, EPROM, flash drive, hard drive, etc. in terms of hardware. The memory 130 may store various data for the overall operation of the electric vehicle 100, such as a program for processing or control by the control unit 170.

The output unit 140 is for outputting information processed by the controller 170 and may include a display unit, a sound output unit, and a haptic output unit.

The display unit may display information processed by the controller 170 . For example, the display unit may display electric vehicle related information. Here, the electric vehicle-related information may include electric vehicle state information indicating a current state of the electric vehicle or electric vehicle driving information related to driving of the electric vehicle. For example, the display unit may display information about the current speed (or speed) of the electric vehicle, the speed (or speed) of the surrounding electric vehicle, and the distance between the current electric vehicle and the surrounding electric vehicle.

Meanwhile, the display unit may include a cluster so that the driver can check electric vehicle state information or electric vehicle driving information while driving. Clusters can be located above the dashboard. In this case, the driver can check the information displayed on the cluster while keeping his/her gaze in front of the electric vehicle.

The sound output unit converts the electrical signal from the control unit 170 into an audio signal and outputs it. To this end, the sound output unit may include a speaker or the like.

The electric vehicle driving unit 150 may control the operation of various electric vehicle devices. The electric vehicle driving unit 150 may include a power source driving unit, a steering driving unit, a brake driving unit, a lamp driving unit, an air conditioning driving unit, a window driving unit, an airbag driving unit, a sunroof driving unit, and a suspension driving unit.

The brake driver may perform electronic control of a brake apparatus (not shown) in the electric vehicle 100 . For example, the speed of the electric vehicle 100 may be reduced by controlling the operation of brakes disposed on wheels. As another example, the driving direction of the electric vehicle 100 may be adjusted to the left or right by differentiating the operation of the brakes respectively disposed on the left and right wheels.

The lamp driver may control turn-on/turn-off of lamps disposed inside and outside the electric vehicle. In addition, the intensity and direction of the light of the lamp can be controlled. For example, control of direction indicator lamps and brake lamps may be performed.

The controller 170 may control the overall operation of each unit in the electric vehicle 100. The controller 170 may be referred to as an Electronic Control Unit (ECU). The aforementioned accident determination device may be driven by the controller 170 .

The control unit 170, in terms of hardware, includes application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors ( It may be implemented using at least one of processors, controllers, micro-controllers, microprocessors, and electrical units for performing other functions.

The interface unit 180 may serve as a passage for various types of external devices connected to the electric vehicle 100. For example, the interface unit 180 may have a port connectable to a mobile terminal (not shown), and may be connected to a mobile terminal (not shown) through the port. In this case, the interface unit 180 can exchange data with the mobile terminal.

The power supply unit 190 may supply power required for operation of each component according to the control of the control unit 170 . In particular, the power supply unit 190 may receive power from a battery (not shown) inside the electric vehicle.

FIG. 2 is a block diagram of an electric vehicle driving assistance system (ADAS) shown in FIG. 1 .

The ADAS 200 is an electric vehicle driving assistance system that assists a driver in order to provide convenience and safety.

The ADAS 200 includes an automatic emergency braking module (hereinafter referred to as AEB: Autonomous Emergency Braking) 210, a forward collision avoidance module (hereinafter referred to as FCW: Forward Collision Warning) 211, a lane departure warning module (hereinafter referred to as LDW: Lane Departure Warning) (212), Lane Keeping Assist (LKA) (213), Speed Assist System (SAS) (214), Traffic Sign Detection Module (TSR) Recognition) (215), adaptive high beam control module (hereinafter, HBA: High Beam Assist) (216), blind spot monitoring module (hereinafter, BSD: Blind Spot Detection) (217), automatic emergency steering module (hereinafter, AES: Autonomous Emergency Steering (218), Curve Speed Warning System (CSWS) (219), Adaptive Cruise Control (ACC) (220), Smart Parking System (220) , SPAS: Smart Parking Assist System (SPAS) 221, a traffic congestion support module (hereinafter referred to as TJA: Traffic Jam Assist) 222, and an around view monitor module (hereinafter referred to as AVM: Around View Monitor) 223 may be included. .

Each of the ADAS modules 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223 may include a processor for controlling an electric vehicle driving assistance function.

A processor included in each of the ADAS modules 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223 may be controlled by the controller 270. .

Each of the ADAS modules (210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223) processors, in terms of hardware, ASICs (application specific integrated circuits), DSPs (digital signal processors), DSPDs (digital signal processing devices), PLDs (programmable logic devices), FPGAs (field programmable gate arrays), processors, controllers, micro-controllers, microprocessors microprocessors) and electrical units for performing other functions.

The AEB 210 is a module that controls automatic braking in order to prevent a collision with a detected object. The FCW 211 is a module that controls a warning to be output in order to prevent a collision with an object in front of the electric vehicle. The LDW 212 is a module that controls a warning to be output to prevent lane departure while driving. The LKA 213 is a module that controls to maintain a driving lane while driving. The SAS 214 is a module that controls driving at a set speed or less. The TSR 215 is a module that detects a traffic signal while driving and provides information based on the detected traffic signal. The HBA 216 is a module that controls the irradiation range or amount of high beam light according to driving conditions. The BSD 217 is a module that detects an object outside the driver's visual field while driving and provides detection information. AES (218) is a module that automatically performs steering in an emergency. The CSWS 219 is a module that controls to output a route when driving at a preset speed or higher during curve driving. The ACC 220 is a module that controls to follow and drive a preceding electric vehicle. The SPAS 221 is a module that detects a parking space and controls to park in the parking space. The TJA 222 is a module that controls automatic operation in case of traffic congestion. The AVM 223 is a module that provides an image around the electric vehicle and controls to monitor the surroundings of the electric vehicle.

The ADAS 200 provides a control signal for performing each electric vehicle driving assistance function to the output unit 250 or the electric vehicle driving unit 260 based on the data acquired by the input unit 230 or the sensing unit 235. can do. The ADAS 200 may directly output the control signal to the output unit 250 or the electric vehicle driving unit 260 through electric vehicle internal network communication (eg, CAN). Alternatively, the ADAS 200 may output the control signal to the output unit 250 or the electric vehicle driving unit 260 via the control unit 270.

3 to 6 are diagrams for explaining wireless charging of an electric vehicle.

3 is a conceptual diagram for explaining the concept of electric vehicle wireless power transmission. Referring to FIG. 1 , wireless power transmission may be performed by at least one component of an electric vehicle (10) and a charging station (13), and to wirelessly transmit power to the electric vehicle (10). can be used for In electric vehicle charging, the base that converts and controls the power of the distribution network transfers the power to the vehicle's receiving coil through the transmitting coil, and the vehicle's wireless charging control device rectifies and converts the power to the vehicle's power or by performing battery charging.

Electric vehicles include an on-board charger (OBC), and the on-board charger transmits and receives CAN (controller area network) messages to and from the battery management system (BMS) according to energy management strategies or policies, and through the vehicle DC-DC converter. The charging and/or discharging of the battery may be controlled. Here, the electric vehicle 10 may generally be defined as a vehicle that supplies current induced from a rechargeable energy storage device such as the battery 12 as an energy source for an electric motor, which is a power unit. However, the electric vehicle 10 according to the present invention may include a hybrid vehicle having an electric motor and a general internal combustion engine together, and may be used not only in automobiles but also in motorcycles, carts, may include scooters and electric bicycles.

In addition, the electric vehicle 10 may include a receiving pad 11 including a receiving coil to charge the battery 12 wirelessly, and may include a plug connection port to charge the battery 12 by wire. may be In this case, the electric vehicle 10 capable of charging the battery 12 by wire may be referred to as a plug-in electric vehicle (PEV). Here, the charging station 13 may be connected to a power grid 15 or a power backbone, and an alternating current (AC) is supplied to the transmission pad 14 including the transmission coil through a power link. Alternatively, direct current (DC) power may be provided. In addition, the charging station 13 can communicate with a power grid 15 or an infrastructure management system or infrastructure server that manages the power grid through wired or wireless communication, and performs wireless communication with the electric vehicle 10 can do. Here, wireless communication may include Bluetooth, zigbee, cellular, wireless local area network, and the like.

In addition, the charging station 13, as shown in FIGS. 4 and 5, is located in various places, such as a parking lot attached to the owner's house of the electric vehicle 10, a parking area for charging an electric vehicle at a gas station, a parking area at a shopping center or a workplace, and the like. can be located

Here, in the process of wirelessly charging the battery 12 of the electric vehicle 10, first, the power receiving pad 11 of the electric vehicle 10 is placed in an energy field by the power transmission pad 14, so that the power transmission pad 14 ) and the receiving coil of the receiving pad 11 may interact or be coupled to each other. As a result of the interaction or coupling, electromotive force is induced in the receiving pad 11, and the battery 12 can be charged by the induced electromotive force.

In addition, all or part of the charging station 13 and the transmission pad 14 may be referred to as a Ground Assembly (GA), and the meaning defined above may be referred to as the ground assembly. In addition, all or part of the power receiving pad 11 and other electric vehicle internal components of the electric vehicle 10 may be referred to as a vehicle assembly (VA), where the vehicle assembly may refer to the meaning previously defined. Here, the transmission pad or the reception pad may be non-polarized or polarized. At this time, if the pad is non-polar, one pole may be present in the center of the pad, and the opposite pole may be located on the outer periphery of the pad. Here, the flux may be formed to exit at the center of the pad and return at all outer edges of the pad. Also, if the pad is polar, it may have a respective pole at either end of the pad. Here, the magnetic flux may be formed based on the orientation of the pad.

6 is a conceptual diagram illustrating an electric vehicle wireless charging circuit to which an embodiment of the present invention can be applied. Referring to FIG. 6, a schematic configuration of a circuit in which charging is performed in an electric vehicle wireless charging system can be seen.

Here, the circuit on the left side of FIG. 6 can be interpreted as representing all or part of the configurations of the power source (Vsrc) supplied from the power grid, the charging station 13, and the transmission pad 14 in FIG. 3, and the right side of FIG. 6 The circuit can be interpreted as expressing part or all of the electric vehicle including the faucet pad and battery. First, the circuit on the left of FIG. 6 provides the output power Psrc corresponding to the power supply Vsrc supplied from the power grid to the wireless charging power converter, and the wireless charging power converter at the desired operating frequency in the transmission coil L1. In order to emit an electromagnetic field, the frequency of the supplied power Psrc and the AC/DC converted power P1 can be output.

Specifically, the wireless charging power converter is an AC/DC converter that converts power (Psrc) supplied from the power grid into DC power when AC power, and a low-frequency converter (or LF) that converts DC power into power of an operating frequency suitable for wireless charging. converter) may include at least one of them. The operating frequency may be determined to be located between 80 and 90 kHz, for example. The power P1 output from the wireless charging power converter may be supplied to a circuit composed of a transmission coil L1, a first capacitor C1, and a first resistor R1. At this time, the first capacitor C1 ) may be determined to have a device value that has an operating frequency suitable for charging together with the transmitting coil L1. In addition, here, the first resistor (R1) may mean a power loss generated by the transmission coil (L1) and the first capacitor (C1). Here, the transmitting coil L1 and the receiving coil L2 may be electromagnetically coupled defined by a coupling coefficient m to transmit power, or the power may be induced to the receiving coil L2. Therefore, in the present invention, the meaning that power is transmitted may be used interchangeably with the meaning that power is induced. Here, the power P2 induced or transmitted to the receiving coil may be provided to the electric vehicle power converter. At this time, the second capacitor (C2) may be determined as a device value to have an operating frequency suitable for charging together with the receiving coil (L2), the second resistor (R2) is the receiving coil (L2) and the second capacitor (C2) It can mean the power loss caused by The electric vehicle power converter may include a LF/DC converter that converts the supplied power P2 of a specific operating frequency back into DC power having a voltage level suitable for the battery VHV of the electric vehicle. When the electric vehicle power converter outputs power (PHV) converted from the supplied power (P2), the output power (PHV) can be used to charge the battery (VHV) built in the electric vehicle.

Here, the circuit on the right side of FIG. 6 may further include a switch for selectively connecting or disconnecting the receiving coil L2 from the battery VHV. Here, the resonance frequencies of the transmitting coil (L1) and the receiving coil (L2) may be configured to be similar or identical to each other, and the receiving coil (L2) is located in a short distance to the electromagnetic field generated by the transmitting coil (L1). can be configured to do so. Here, the circuit of FIG. 6 should be understood as an exemplary circuit for power transmission in an electric vehicle wireless charging system usable for the embodiments of the present invention, and should not be construed as being limited to the circuit in FIG. 6 . Meanwhile, since power loss may increase as the transmitting coil L1 and the receiving coil L2 are located farther away, setting the positions of both may be an important factor. At this time, the transmitting coil L1 may be included in the transmitting pad 14 in FIG. 3 , and the receiving coil L2 may be included in the receiving pad 11 in FIG. 3 .

7 is an exemplary diagram for explaining wireless charging between electric vehicles according to an embodiment.

Referring to FIG. 7 , a first electric vehicle 10 and a second electric vehicle 20 are shown. Each of the electric vehicles 10 and 20 includes batteries 2 and 12, transmission and reception pads 3 and 13, and vehicle control terminals 4 and 14, respectively. Each of the electric vehicles 10 and 20 may perform wireless communication with the external server 30 . In addition, each of the electric vehicles 10 and 20 may perform vehicle-to-vehicle communication (V2V). Vehicle-to-Vehicle Communication (V2V) is a communications technology designed for Dedicated Short-Range Communication (DSRC) to allow vehicles to communicate with each other. V2V communication can utilize all types of radio components and use vehicle ad hoc networks (VANETs) on the road. The transmitting and receiving pads 3 and 13 may include both a transmitting pad and a receiving pad. The vehicle control terminals 4 and 14 may be terminals capable of controlling wireless charging between vehicles according to an embodiment. The vehicle control terminals 4 and 14 may be In-Vehicle Infotainment (IVI) devices.

As shown in FIG. 7, for wireless charging between electric vehicles, the transmission and reception pads 3 and 13 are shown as being integrally disposed on the front (bonnet) of the vehicle, but the transmission pad may be disposed on the front or the reception pad on the rear. may be

8 is a schematic diagram for explaining a wireless charging device between electric vehicles according to an embodiment.

Referring to FIG. 8 , the wireless charging device 800 includes a control unit 810, a wireless communication unit 820, a mode setting unit 830, and a wireless charging control unit 840. The wireless charging device 800 may be a controller shown in FIGS. 1 and 2 or a vehicle control terminal shown in FIG. 7 . In the wireless charging device 800 according to the embodiment, when another electric vehicle equipped with a wireless charging receiving pad is located at a predetermined distance, a communication network between the electric vehicle and the vehicle is established, and the other electric vehicle is authenticated through the communication network between the vehicles. In this case, the battery sharing mode can be activated. In addition, when the battery sharing mode is activated, the battery power can be controlled to be transmitted to the wireless charging receiving pad of another electric vehicle through the wireless charging transmitting pad according to the user's selection.

In an embodiment, as shown in FIG. 7 , for wireless charging between electric vehicles, two electric vehicles may be parallelly parked side by side or two electric vehicles may be arranged in a line. For example, depending on the position of a transmission pad or a reception pad of an electric vehicle, it may be placed in a position where wireless charging is possible.

The controller 810 controls the overall operation of the device 800. The controller 810 detects whether other electric vehicles are located within a certain distance, for example, within a distance where wireless charging is possible. The sensing method can be confirmed through a proximity sensor or an inter-vehicle communication module, and various sensing methods can be used, of course. When another electric vehicle approaches, the controller 810 requests the wireless communication unit 920 to establish an inter-vehicle communication network.

The wireless communication unit 920 may include a wireless communication module for communication with an external server (not shown) and a communication module for vehicle-to-vehicle communication (V2V). Under the control of the control unit 810, the wireless communication unit 920 establishes an inter-vehicle communication network with other approaching electric vehicles.

The mode setting unit 830 activates the battery sharing mode when an inter-vehicle communication network is set and another electric vehicle is authenticated. In addition, the mode setting unit 830 may activate the battery sharing mode only when the remaining amount of the battery is greater than or equal to a threshold value, for example, 30%. The control unit 810 may receive vehicle information of other electric vehicles, such as user information, battery information, wireless charging availability information, etc., through the vehicle-to-vehicle communication network, and may authenticate the other electric vehicles.

When the battery sharing mode is activated, the controller 810 may display a menu for selecting whether to start sharing the battery or starting wireless charging on a display that can be checked by the driver. Here, the display may be an IVI device.

The controller 810 transmits a charging start command to the wireless charging controller 840 according to the driver's selection.

The wireless charging control unit 840 charges another electric vehicle equipped with a wireless charging receiving pad through a transmitting pad.

When wireless charging is completed, the controller 810 may transmit charging completion information to an external server (server 30 shown in FIG. 7). The external server 30 may create, manage, and utilize a charging record among electric vehicle users by using the charging completion information.

9 is a flowchart for explaining a wireless charging method between electric vehicles according to another embodiment.

Referring to FIG. 9 , in step 900, when another electric car equipped with a wireless charging receiving pad is located at a predetermined distance, a communication network between the electric car and the vehicle is established.

In step 902, when another electric vehicle is authenticated through the vehicle-to-vehicle communication network, a battery sharing mode is activated.

In step 904, the battery power is controlled to be transmitted to the wireless charging receiving pad of another electric vehicle through the wireless charging transmitting pad.

A device according to an embodiment includes a processor, a memory for storing and executing program data, a permanent storage unit such as a disk drive, a communication port for communicating with an external device, a user interface such as a touch panel, a key, and a button. interface devices and the like. Methods implemented as software modules or algorithms may be stored on a computer-readable recording medium as computer-readable codes or program instructions executable on the processor. Here, the computer-readable recording medium includes magnetic storage media (e.g., read-only memory (ROM), random-access memory (RAM), floppy disk, hard disk, etc.) and optical reading media (e.g., CD-ROM) ), and DVD (Digital Versatile Disc). A computer-readable recording medium may be distributed among computer systems connected through a network, and computer-readable codes may be stored and executed in a distributed manner. The medium may be readable by a computer, stored in a memory, and executed by a processor.

Reference numerals have been described in the embodiments shown in the drawings, and specific terms have been used to describe the embodiments, but the present invention is not limited by specific terms, and the embodiments are all configurations commonly conceivable to those skilled in the art. elements may be included.

An embodiment may be presented as functional block structures and various processing steps. These functional blocks may be implemented with any number of hardware or/and software components that perform specific functions. For example, an embodiment is an integrated circuit configuration such as memory, processing, logic, look-up table, etc., which can execute various functions by control of one or more microprocessors or other control devices. can employ them. Similar to components of the present invention that may be implemented as software programming or software elements, embodiments may include various algorithms implemented as data structures, processes, routines, or combinations of other programming constructs, such as C, C++ , Java (Java), can be implemented in a programming or scripting language such as assembler (assembler). Functional aspects may be implemented in an algorithm running on one or more processors. In addition, the embodiment may employ conventional techniques for electronic environment setting, signal processing, and/or data processing. Terms such as “mechanism”, “element”, “means” and “composition” may be used broadly and are not limited to mechanical and physical components. The term may include a meaning of a series of software routines in association with a processor or the like.

Specific executions described in the embodiments are examples, and do not limit the scope of the embodiments in any way. For brevity of the specification, description of conventional electronic components, control systems, software, and other functional aspects of the systems may be omitted. In addition, the connection of lines or connecting members between the components shown in the drawings are examples of functional connections and / or physical or circuit connections, which can be replaced in actual devices or additional various functional connections, physical connection, or circuit connections. In addition, if there is no specific reference such as “essential” or “important”, it may not be a component necessarily required for the application of the present invention.

In the specification of embodiments (particularly in the claims), the use of the term “above” and similar indicating terms may correspond to both singular and plural. In addition, when a range is described in the examples, it includes the invention to which individual values belonging to the range are applied (unless there is no description to the contrary), and it is as if each individual value constituting the range is described in the detailed description. . Finally, if there is no explicit description or description of the order of steps constituting the method according to the embodiment, the steps may be performed in an appropriate order. Examples are not necessarily limited according to the order of description of the steps. The use of all examples or exemplary terms (eg, etc.) in the embodiments is simply to describe the embodiments in detail, and the scope of the embodiments is limited due to the examples or exemplary terms unless limited by the claims. It is not. In addition, those skilled in the art can appreciate that various modifications, combinations and changes can be made according to design conditions and factors within the scope of the appended claims or equivalents thereof.

Claims (10)

Setting a communication network between an electric vehicle and a vehicle when another electric vehicle equipped with a wireless charging receiving pad is located at a predetermined distance;
activating a battery sharing mode when the other electric vehicle is authenticated through the vehicle-to-vehicle communication network; and
A wireless charging method between electric vehicles, comprising the step of controlling battery power to be transmitted to a wireless charging receiving pad of the other electric vehicle through a wireless charging transmitting pad. According to claim 1,
When the battery sharing mode is activated, the battery power is transmitted to the wireless charging receiving pad of the other electric vehicle according to a user selection signal. According to claim 1,
Further comprising the step of determining whether the remaining amount of the battery is greater than or equal to a threshold value,
The wireless charging method between electric vehicles, characterized in that the battery sharing mode is activated when the remaining amount of the battery is equal to or greater than a threshold value. According to claim 1,
The wireless charging method between electric vehicles, characterized in that receiving vehicle information of the other electric vehicle through the vehicle-to-vehicle communication network, and authenticating the other electric vehicle based on the received vehicle information. According to claim 1,
A wireless charging method between electric vehicles, characterized in that when wireless charging to the other electric vehicle is terminated, charging completion information is transmitted to an external server. A recording medium recording a program for executing the wireless charging method between electric vehicles according to any one of claims 1 to 5 in a computer. A wireless charging transmission pad that transmits the power stored in the battery to the outside; and
When another electric vehicle equipped with a wireless charging reception pad is located at a predetermined distance, a communication network between the electric vehicle and the vehicle is set, and when the other electric vehicle is authenticated through the vehicle-to-vehicle communication network, a battery sharing mode is activated. , A wireless charging device between electric vehicles including a processor that controls the power of the battery to be transmitted to the wireless charging receiving pad of the other electric vehicle through the wireless charging transmission pad. According to claim 7,
A wireless charging device between electric vehicles, characterized in that when the battery sharing mode is activated, a user selection signal is input through a user interface of an In Vehicle Infotainment (IVI) device. According to claim 7,
the processor,
The wireless charging device between electric vehicles, characterized in that it determines whether the remaining amount of the battery is greater than or equal to a threshold value, and if the remaining amount of the battery is greater than or equal to the threshold value, the battery sharing mode is activated. According to claim 7,
the processor,
The wireless charging device between electric vehicles, characterized in that for receiving vehicle information of the other electric vehicle through the vehicle-to-vehicle communication network, and authenticating the other electric vehicle based on the received vehicle information.

Images