Wireless power transmission pairing method and device

Abstract

Disclosed are a wireless power transmission pairing method and apparatus for simultaneously performing a pairing process during a V2G WPT precise positioning process. The wireless power transmission pairing method includes the following steps: when an LF signal indicating that a secondary device of an electric vehicle is located within an alignment tolerance area on a primary device of an electric vehicle power supply device is detected, parking the electric vehicle, sending a precise positioning request message in which a result code parameter is configured as success to a power supply equipment communication controller (SECC), and immediately after receiving a precise positioning response message in which a response code parameter is configured as OK from the SECC, sending a pairing request message in which an identifier code parameter is configured as a pairing identification code and an EV processing parameter is configured as terminated to the SECC.

Description

Technical Field

[0001] The present disclosure relates to methods and apparatus for wireless power transfer pairing, wherein a pairing process is performed simultaneously with a precise positioning process between an electric vehicle communication controller and a power supply equipment communication controller for magnetic field-based wireless power transfer between an electric vehicle (EV) and a power grid. Background Art

[0002] In a magnetic field (MF)-based wireless power transfer (WPT) system, communication between an electric vehicle communication controller (EVCC) and a supply equipment communication controller (SECC) is typically established using a single SECC discovery protocol (SDP). Signals or messages are sent and received using low-frequency (LF) signals or low-power excitation (LPE) without the need for pairing and positioning devices (PPD). Alternatively, signals or messages are sent and received using machine vision techniques such as quick response (QR) codes or using peer-to-peer (P2PS) with optical schemes.

[0003] In a vehicle-to-grid (V2G) communication session for wireless power transfer, messages between the EVCC and the SECC follow a process such as precise positioning setup, precise positioning, and pairing in the described order. Here, precise positioning or positioning continuously provides alignment information as the EV approaches a power supply device to support the EV's approach within an alignment tolerance. Pairing is used to ensure that both the EVCC and the SECC can uniquely identify the primary device located in the EV.

[0004] Meanwhile, the precise positioning request message in the SDP message or precise positioning message includes compatibility information and the electric vehicle identifier (IMD). That is, the precise positioning request message typically contains information about multiple compatible SECCs. However, the precise positioning response message only includes information about one candidate SECC. Therefore, regardless of the EV's location, there is always a possibility that the EV will connect to the wrong SECC. As a result, the EV may mistakenly identify the wireless local area network (WLAN) signal at the charging station and enter another nearby charging station instead of the target charging station.

[0005] Furthermore, when connected to the wrong SECC, the EV has no chance to detect the incorrect connection except when precise positioning fails. In this error situation, the EV cannot properly proceed or complete the precise positioning process. In such a case, the EV must terminate the current precise positioning session, return to the precise positioning setup process or SDP process, and restart from SECC discovery, which is very inefficient.

[0006] As described above, currently it is a situation where errors may occur in the SDP process or the precise positioning process for wireless power transmission between an electric vehicle and a grid, and there is a need to solve this problem. Summary of the Invention

[0007] [Technical Issues]

[0008] An object of the present disclosure is to provide a method and apparatus for wireless power transfer (WPT) pairing, wherein, when combined with a precise positioning process between an electric vehicle communication controller (EVCC) and a supply equipment communication controller (SECC) for magnetic field-based WPT between an electric vehicle (EV) and a power grid, the pairing process is performed virtually simultaneously with the precise positioning process.

[0009] Another object of the present disclosure is to provide a method and apparatus for WPT pairing, which can effectively prevent incorrect connection between SECC and EVCC during a precise positioning process, and can effectively cope with the occurrence of incorrect connection by performing a pairing process and a precise positioning process for WPT between a power grid and an EV in a combined manner.

[0010] [Technical solution]

[0011] As a method for pairing with a supply equipment communication controller (SECC) performed by an electric vehicle (EV), a WPT pairing method for solving the above-mentioned technical problem according to one aspect of the present disclosure may include: sending a fine positioning request message (FinePositioningReq) to the SECC, the fine positioning request message (FinePositioningReq) including information about an identifier of a first antenna in an EVSE connected to the SECC and a first operating frequency of a first electric vehicle supply equipment (EVSE); sending a low frequency (LF) signal at the first operating frequency to a main device of the first EVSE; receiving information about the LF signal at the EVSE from the SECC through a fine positioning response message (FinePositioningRes); and dynamically calculating a location based on the information about the LF signal at the EVSE. calculating the position of the primary device of the second EVSE having the maximum LF signal value; parking when an LF signal indicating that the secondary device of the EV is located within an alignment tolerance range from the primary device of the second EVSE is detected; determining whether the second EVSE is the same as the first EVSE indicated by the precise positioning request message or the precise positioning setup response message; and sending a pairing request message with an identifier code (ObservedIDcode) parameter set to “pairing identification code” and an EV processing (EVProcessing) parameter set to “completed” to the SECC immediately after sending a precise positioning request message with a result code (ResultCode) parameter set to “success” to the SECC and receiving a precise positioning response message with a response code (ResponseCode) parameter set to “OK” from the SECC.

[0012] The method may further include receiving a pairing response message (PairingRes) having an EV processing parameter set to "Done" and a response code parameter set to "OK" from the SECC.

[0013] The method may further include: when the second EVSE having the maximum LF signal value is different from the first EVSE indicated by the fine positioning request message or the fine positioning setup request message (FinePositioningSetupRes), and the second EVSE has the same configuration as the first EVSE, allowing the SECC to change the identifier of the second antenna of the second EVSE to the identifier of the first antenna of the first EVSE, and controlling an internal connection between the second antenna of the second EVSE and the first antenna of the first EVSE to be changed.

[0014] The method may further include: when the second EVSE having the maximum LF signal value is different from the first EVSE indicated by the fine positioning request message or the fine positioning setup response message (FinePositioningSetupRes), and the second EVSE is an EVSE having a configuration different from that of the first EVSE, receiving, from the SECC, a fine positioning response message including information requesting a return of the fine positioning setup process; or receiving, from the SECC, a fine positioning response message having a response code parameter set to “OK” and including an alternative SECC information (AlternativeSECCInfo) parameter or an alternative SECC list (AlternativeSECCList) parameter.

[0015] The method may further include sending a LF signal of "Connection Admission Control (CAC)" set to the same antenna identifier (ANT_ID) or antenna identifier code (IDCode) to the SECC through point-to-point signal (P2PS) signaling between an electric vehicle communication controller (EVCC) of the EV and the SECC.

[0016] The second EVSE may receive the LF signal having a strength exceeding a specific threshold through all antennas for LF signal reception and have a maximum LF signal value among the EVSEs.

[0017] As a method for pairing with an electric vehicle communication controller (EVCC) of an electric vehicle (EV) performed by a power supply equipment communication controller (SECC), a WPT pairing method for solving the above-mentioned technical problem according to another aspect of the present disclosure may include: sending a fine positioning setup response message (FinePositioningSetupRes) including information about an identifier of an antenna, a position and direction of the antenna, and an operating frequency of each electric vehicle supply equipment (EVSE) connected to the SECC to the EVCC in response to a fine positioning setup request message (FinePositioningSetupReq); receiving information about an identifier of a first antenna and information about effective isotropic radiated power (EIRP) of antennas of secondary devices of the EV from the EVCC through the fine positioning request message (FinePositioningReq); activating an LF receiver of each EVSE to receive a low frequency (LF) signal for fine positioning from the EV; receiving an LF signal with the identifier of the first antenna through point-to-point signaling (P2PS) signaling; and determining whether the identifier of the first antenna is the same as a pre-stored antenna identifier or identifier code (ObservedIDCode); when the identifier of the first antenna is the same as the identifier code, sending information about a received signal strength indicator (RSSI) of the LF signal at the EVSE to the EVCC; receiving a fine positioning request message (FinePositioningReq) with a result code (ResultCode) parameter set to "success" from the EVCC; sending a fine positioning response message (FinePositioningRes) with a response code (ResponseCode) parameter set to "OK" to the EVCC in response to the fine positioning request message; and receiving a pairing request message (PairingReq) with an identifier code parameter set to "pairing identification code" and an EV processing (EV processing) parameter set to "complete" from the EVCC when a second EVSE having a maximum LF signal value among the EVSEs is the same as the first EVSE corresponding to the identifier of the first antenna indicated by the fine positioning setup response message or the fine positioning request message.

[0018] The method may further include, when the second EVSE is the same as the first EVSE, sending a pairing response message (PairingRes) with an EV Handling parameter set to “Complete” and a Response Code parameter set to “OK” to the EVCC.

[0019] The method may further include: when the second EVSE is an EVSE different from the first EVSE and the second EVSE is an EVSE having the same configuration as the first EVSE, changing an identifier of a second antenna of the second EVSE to an identifier of a first antenna of the first EVSE; and controlling an internal connection between the second antenna of the second EVSE and the first antenna of the first EVSE to be changed.

[0020] The method may further include: when the second EVSE is an EVSE different from the first EVSE and the second EVSE is an EVSE with a configuration different from that of the first EVSE, sending a precise positioning response message including information requesting a return of the precise positioning setting process to the EVCC; or sending a precise positioning response message having a response code (ResponseCode) parameter set to “OK” and including an alternative SECC information (AlternativeSECCInfo) parameter or an alternative SECC list (AlternativeSECCList) parameter to the EVCC.

[0021] According to another aspect of the present disclosure, a WPT pairing method for solving the above-mentioned technical problems, as a method for pairing with an electric vehicle communication controller (EVCC) of an electric vehicle (EV) performed by a power supply equipment communication controller (SECC), may include: sending a fine positioning setup response message (FinePositioningSetupRes) including information about the identifier and operating frequency of the antenna of each electric vehicle supply equipment (EVSE) connected to the SECC to the EVCC in response to a fine positioning setup request message (FinePositioningSetupReq); controlling a first EVSE arbitrarily selected from the EVSEs to send a low-frequency positioning signal for positioning; receiving a fine positioning request message (FinePositioningReq) having a result code (ResultCode) parameter set to “success” from the EVCC; and receiving a pairing request message from the EVCC immediately after sending a fine positioning response message (FinePositioningRes) having a result code (ResultCode) parameter set to “OK” in response to the fine positioning request message, the pairing request message having an identifier code (ObservedIDcode) parameter set to a pairing identification code and an EV processing (EVProcessing) parameter set to “complete”.

[0022] The method may further include sending a pairing response message (PairingRes) having an EV processing parameter set to “Done” and a response code parameter set to “OK” to the EVCC in response to the pairing request message.

[0023] The method may further include: when a reception result of the LF signal received from the EV and received at the secondary device of the EV is less than a reference value, controlling a second EVSE having the same antenna configuration as the first EVSE among the EVSEs indicated by the precise positioning setup response message to transmit an LF signal having the same antenna identifier; and when the EVSE having the largest LF signal value for the LF signal among the EVSEs is the second EVSE, changing an identifier of a second antenna of the second EVSE to an identifier of a first antenna of the first EVSE, and controlling an internal connection between the second antenna of the second EVSE and the first antenna of the first EVSE to be changed.

[0024] The method may further include: when the EVSE having the maximum LF signal value for the LF signal is not the second EVSE and has a configuration different from that of the second EVSE, or the LF signal value is less than a specific threshold, sending a positioning setting response message including information requesting a return to the precise positioning setting process to the EVCC; or sending a precise positioning response message having a response code (ResponseCode) parameter set to “OK” and including an alternative SECC information (AlternativeSECCInfo) parameter or an alternative SECC list (AlternativeSECCList) parameter to the EVCC.

[0025] The method may further include determining whether a "Connection Admission Control (CAC)" in a LF signal transmitted through point-to-point signal (P2PS) signaling with the EVCC maintains the same antenna identifier (ANT_ID) or antenna identifier code (IDCode).

[0026] As a method for pairing with a power supply equipment communication controller (SECC) performed by an electric vehicle communication controller (EVCC), a WPT pairing method for solving the above-mentioned technical problem according to another aspect of the present disclosure may include: sending a fine positioning request message (FinePositioningReq) including information about an identifier (ANT_ID) of a first antenna and an effective isotropic radiated power (EIRP) of a secondary device of an electric vehicle (EV) to the SECC; receiving a low frequency (LF) signal from a primary device of a first electric vehicle supply equipment (EVSE) arbitrarily selected from the EVSE connected to the SECC; sending an LF signal to the SECC through point-to-point signal (P2PS) signaling, the LF signal having a "connection admission control (CAC)" set to the identifier of the first antenna identifier or the identifier code (IDCode) of the first antenna; Information about a received signal strength indicator (RSSI) detected at a secondary device of the EV is sent to the SECC; the location of the primary device is dynamically calculated based on the RSSI; in response to acquiring a signal or RSSI indicating that the secondary device is located within an alignment tolerance range from the primary device, the EV is stopped and parked; and immediately after sending a precise positioning request message with a result code (ResultCode) parameter set to "positioning successful" to the SECC and receiving a precise positioning response message with a response code (ResponseCode) parameter set to "OK" from the SECC, a pairing request message (PairingReq) with an identifier code (ObservedIDcode) parameter set to "pairing identification code" and an EV processing (EVProcessing) parameter set to "completed" is sent to the SECC.

[0027] The method may further include receiving a pairing response message (PairingRes) having an EV processing parameter set to "Done" and a response code parameter set to "OK" from the SECC.

[0028] The method may further include: when a signal or RSSI value indicating that the secondary device is located within the alignment tolerance range from the primary device is not identified while the EV is parked, sending a precise positioning request message having a result code parameter set to "positioning failure" to the SECC; and receiving a precise positioning response message having a response code parameter set to "OK" and including an alternative SECC information (AlternativeSECCInfo) parameter or an alternative SECC list (AlternativeSECCList) parameter from the SECC.

[0029] According to another aspect of the present disclosure, a WPT pairing device for solving the above-mentioned technical problems is provided. As a WPT pairing device included in a power supply equipment communication controller (SECC), the power supply equipment communication controller (SECC) is configured to perform pairing with an electric vehicle communication controller (EVCC) in wireless power transmission between an electric vehicle (EV) and a power grid. The WPT pairing device may include: a processor; and a memory storing instructions executable by the processor. When executed by a processor, the instructions may cause the processor to: send and receive fine positioning related messages to and from the EVCC to align a secondary device of the EV within an alignment tolerance range from a primary device of an electric vehicle supply equipment (EVSE) connected to the SECC; receive a low frequency (LF) signal from the EVCC through point-to-point signal (P2PS) signaling, with a "connection admission control (CAC)" of the low frequency (LF) signal being set to an identifier (ANT_ID) or an antenna identifier code (IDCode) of a first antenna; and after receiving a pairing request message (PairingReq) with a result code (ResultCode) parameter set to "success" from the EVCC and sending a fine positioning response message (FinePositioningRes) with a response code (ResponseCode) parameter set to "OK" to the EVCC, send a pairing request message (PairingReq) with an identifier code (ObservedIDcode) parameter set to "pairing identification code" and an EV processing (EVProcessing) parameter set to "completed" from the EVCC.

[0030] The instructions may cause the processor to further execute: sending a pairing response message (PairingRes) having an EV processing parameter set to “Done” and a response code parameter set to “OK” to the EVCC.

[0031] The instructions may cause the processor to further execute: controlling a first EVSE arbitrarily selected from among the EVSEs connected to the SECC to transmit a low frequency (LF) signal for precise positioning; when a reception result of the LF signal received from the EV at a secondary device of the EV is less than a reference value, controlling a second EVSE having the same antenna configuration as the first EVSE among the EVSEs indicated by the precise positioning request message or the precise positioning setup response message to transmit a LF signal having the same antenna identifier; receiving a precise position request message (FinePositioningReq) having a result code (ResultCode) parameter set to “success” from the EVCC of the EV that has stopped and parked after performing precise positioning based on the LF signal; and when the EVSE having the largest LF signal value for the low frequency signal is the second EVSE, changing an identifier of a second antenna of the second EVSE to an identifier of a first antenna of the first EVSE, and controlling an internal connection between the second antenna of the second EVSE and the first antenna of the first EVSE to be changed.

[0032] The instructions may cause the processor to further execute: receiving a precise positioning request message having a result code parameter set to "positioning failure" from the EVCC; and in response to the precise positioning request message, sending a precise positioning response message having a response code (ResponseCode) parameter set to OK and including an alternative SECC information (AlternativeSECCInfo) parameter or an alternative SECC list (AlternativeSECCList) parameter to the SECC.

[0033] [Beneficial Effects]

[0034] According to the present disclosure, the pairing process may be combined with a precise positioning process in a wireless power transmission (WPT) process between an EV and a grid, thereby omitting or simplifying the pairing process.

[0035] Furthermore, according to the present disclosure, while performing a precise positioning process, it is possible to effectively prevent a problem in which an SDP server erroneously receives information about an EVCC, or an EV erroneously recognizes a WLAN signal from an SDP server and enters a nearby charging station.

[0036] In addition, according to the present disclosure, the process of changing the antenna identification information of the charging station that the EV has entered and resending it to the EV through the SDP server or the SECC connected to the SDP server can effectively and quickly handle errors that are prone to occur during the precise positioning process, thereby increasing user convenience by omitting repeated tasks of the EV or the user according to the error.

[0037] Furthermore, if an error occurs during the precise positioning process that cannot be resolved in the current session, the SECC can provide information about an alternative SECC or a list of alternative SECCs that can be used by the EVCC. This allows the EVCC, which has returned to the SECC discovery process, to easily perform the precise positioning setup process again. This improves the efficiency of the WPT system and reduces costs while simplifying the V2G communication session process. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a diagram for schematically describing an overall configuration of a magnetic field (MF)-based WPT system capable of adopting a WPT pairing method according to an exemplary embodiment of the present disclosure.

[0039] Figure 2 Is used to describe Figure 1 Schematic diagram of the wireless power flow and communication interface between the power supply device (SD) and the EV device (EVD) that can be used in a WPT system.

[0040] Figure 3 is a flowchart for describing a system model capable of adopting a WPT pairing method according to an exemplary embodiment of the present disclosure.

[0041] Figure 4 It is possible to adopt Figure 3 An exemplary diagram of a WPT system architecture of a WPT pairing method.

[0042] Figures 5 to 7 Is used to describe Figure 3 An exemplary diagram of the problem of the association between SECC and EV in the system model of FIG.

[0043] Figure 8 It is shown that it is applicable to Figure 3 Sequence diagram of the WPT pairing method of the system model.

[0044] Figure 9 Is used to describe Figure 8 FIG1 is an exemplary diagram of an LF precise positioning process that can be adopted in the WPT pairing method.

[0045] Figure 10 It is shown in Figure 8 Flowchart of the V2G communication process that can be used in the WPT pairing method.

[0046] Figure 11 is a schematic block diagram for describing main components of a WPT pairing device according to another exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0047] Since the present disclosure can be modified in various ways and has various forms, specific exemplary embodiments will be shown in the drawings and described in detail in the specific embodiments. However, it should be understood that the present disclosure is not intended to be limited to specific exemplary embodiments, but rather, the present disclosure will cover all modifications and substitutions that fall within the spirit and scope of the present disclosure.

[0048] Relational terms such as first, second, etc. can be used to describe various elements, but the elements should not be limited by the terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this disclosure, a first component can be named a second component, and a second component can also be similarly named a first component. The term "and / or" refers to any one or combination of multiple related and described items.

[0049] When it is mentioned that a certain component is “coupled” or “connected” to another component, it should be understood that the certain component is directly “coupled” or “connected” to the other component, or another component may be disposed therebetween. Conversely, when it is mentioned that a certain component is “directly coupled” or “directly connected” to another component, it should be understood that the other component is not disposed therebetween.

[0050] The terms used in this disclosure are only used to describe specific exemplary embodiments and are not intended to limit the present disclosure. Unless the context clearly dictates otherwise, singular expressions include plural expressions. In this disclosure, terms such as "including" or "having" are intended to specify the presence of features, quantities, steps, operations, components, parts, or combinations thereof described in this specification, but it should be understood that the terms do not exclude the presence or addition of one or more features, quantities, steps, operations, components, parts, or combinations thereof.

[0051] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. Terms commonly used and already in dictionaries should be interpreted as having meanings that match the contextual meanings in the art. In this specification, unless explicitly defined, terms are not necessarily interpreted as having formal meanings.

[0052] Additional terms used in this disclosure are defined below.

[0053] “Electric vehicle (EV)” may refer to an automobile as defined in 49 codes of federal regulations (CFR) 523.3, etc. EVs can be used on highways and are driven by electricity supplied from an onboard energy storage device, such as a battery that can be recharged from a power source external to the vehicle. The power supply source may include a residence, a public electric service, or a generator using an onboard fuel. EVs may be referred to as trams, electric vehicles, electric road vehicles (ERVs), plug-in vehicles (PVs), plug-in electric vehicles (xEVs), etc., and xEVs may be referred to or classified as plug-in all-electric vehicles or battery electric vehicles (BEVs), plug-in electric vehicles (PEVs), hybrid electric vehicles (HEVs), hybrid plug-in electric vehicles (HPEVs), plug-in hybrid electric vehicles (PHEVs), etc.

[0054] A "plug-in electric vehicle (PEV)" may refer to an EV that charges its onboard main battery by connecting to the electrical grid.

[0055] “Wireless Power Charging System (WCS)” may refer to a system for wireless power transfer, alignment, and communication between a ground assembly (GA) and a vehicle assembly (VA).

[0056] “Wireless power transfer (WPT)” may refer to technology that transmits and receives power from power sources such as utilities, grids, energy storage devices, and fuel cell generators to and from EVs through contactless means such as electromagnetic induction and resonance.

[0057] "Utility": A set of systems that supplies electrical energy and can include customer information systems (CIS), advanced metering infrastructure (AMI), rate and revenue systems, etc. Utilities can provide energy to EVs based on rate schedules and discrete events. In addition, the utility can provide information about EV authentication, intervals for power consumption measurement, and rates.

[0058] “Smart Charging”: A system in which the EVSE and / or PEV communicate with the grid to optimize the EV’s charge rate or discharge rate by reflecting the grid’s capacity or usage charges.

[0059] "Interoperability" refers to the state in which components of a system interact with corresponding components of the system to perform operations targeted by the system. Additionally, information interoperability may refer to the ability of two or more networks, systems, devices, applications, or components to effectively share and easily use information without inconvenience to users.

[0060] "Inductive Charging System": A system that transfers energy from a power source to an EV via a two-part, gapped iron-core transformer, where the two halves of the transformer (i.e., the primary and secondary coils) are physically separated from each other. For purposes of this disclosure, an inductive charging system may correspond to an EV power transmission system.

[0061] "Inductive coupling": Magnetic coupling between two coils. In the present disclosure, coupling is performed between the GA coil and the VA coil.

[0062] "Original Equipment Manufacturer (OEM)": The EV manufacturer or a server operated by the EV manufacturer. This may include the root certification authority (CA) or root certification server that issues the OEM root certificate.

[0063] "Grid Operator (V2G Operator)": A primary participant in V2G communications using a transport protocol, or an entity that initiates a blockchain for automated authentication of EVs or EV users and creates smart contracts on that blockchain. A grid operator may include at least one trusted authentication authority or trusted authentication server.

[0064] "Charging Service Operator (or Electric Vehicle Operator (MO))" is one of the entities within the PnC architecture that has a contractual relationship with EV owners regarding charging, approval, and payment, enabling EV drivers to charge their EV batteries at charging stations. A charging service operator may include at least one certification authority or certification server that issues and manages its own certificates. A charging service operator may also be referred to as a vehicle operator.

[0065] "Charging Service Provider (CSP)": An entity responsible for managing and authenticating EV user credentials and providing charging and other value-added services to customers. A charging service provider may correspond to a specific type of MO and may be implemented in combination with an MO.

[0066] “Charging Station (CS)”: A facility or device that has one or more EV power supply devices and actually performs the charging of EVs.

[0067] "Charging Station Operator (CSO)": An entity that is connected to the grid and manages power to supply the power requested by EVs. A charging station operator may be a term that has the same concept as a charging point operator (CPO) or an electric vehicle service provider (eMSP), or a charging station operator may be a term that is included in or includes the concept of a CPO or eMSP. A CSO, CPO, or eMSP may include at least one certification authority that issues or manages its own certificates.

[0068] "Electric Vehicle Authentication Identifier (eMAID)": A unique identifier that links a contract certificate to the payment account of the owner of an electric vehicle that uses electricity. In an exemplary embodiment, the EV authentication identifier may include an identifier of the EV certificate or an identifier of a provision certificate. The term eMAID may alternatively refer to an "Electric Vehicle Account Identifier" or may be replaced by a contract ID.

[0069] “Clearing House (CH)”: An entity that handles cooperation between MOs, CSPs, and CSOs. It can act as an intermediary to facilitate the approval, charging, and regulation process of EV charging services roaming between the two parties.

[0070] “Roaming”: The exchange of information between CSPs and the schemes and regulations that allow EV users to access charging services provided by multiple CSPs or CSOs belonging to multiple EV networks by using a single credential and contract.

[0071] “Credentials”: ​​physical or digital assets that represent the identity of an EV or EV owner, and may include passwords used to verify identity, public and private key pairs used in public key encryption algorithms, public key certificates issued by certification authorities, and information related to trusted root certification authorities.

[0072] "Certificate": An electronic document that binds a public key to an ID through a digital signature.

[0073] “Service Session”: A collection of services around a charging point related to the charging of an EV assigned to a specific customer within a specific time frame with a unique identifier.

[0074] Hereinafter, exemplary embodiments of the present disclosure will be explained in detail with reference to the accompanying drawings.

[0075] The pairing method between an EVCC and a SECC for vehicle-to-grid (V2G) wireless power transfer (WPT) described in this exemplary embodiment can be provided as a new WPT pairing method, which can simplify the pairing process by combining the pairing process with a precise positioning process using low frequency (LF)-based point-to-point signal (P2PS) signaling performed in a V2G communication session, and can effectively prevent or resolve errors that frequently occur in the precise positioning process.

[0076] Figure 1 is a diagram for schematically describing an overall configuration of a magnetic field (MF)-based WPT system capable of adopting a WPT pairing method according to an exemplary embodiment of the present disclosure.

[0077] like Figure 1 As shown, WPT for electric vehicle (hereinafter, "EV") 10 can be defined as the process of transmitting electrical energy from grid G1 from a power supply device to the EV device via a magnetic field without a direct current connection. In other words, WPT can be used to charge the battery 30 of EV 10 by transmitting power from charging station 20 to EV 10.

[0078] The EV 10 may include an EV power circuit 150 having secondary devices electromagnetically coupled to primary devices within a power supply circuit 250 of the charging station 20. Under the control of the EVCC 100 of the EV 10, secondary coils within the secondary devices may receive electromagnetic energy from the primary coils of the primary devices connected to the charging station 20 according to electromagnetic induction or magnetic resonance. The electromagnetic energy transferred to the EV 10 may be converted into an induced current, which may be rectified into a DC current and then used to charge the battery 30.

[0079] The charging station 20 may receive power from a commercial power grid G1 or a power mains, and supply electromagnetic energy to the EV 10 through a power supply circuit 250 under the control of a SECC 200 within the charging station 20. The power supply circuit 250 may be a component corresponding to at least a portion of an EVSE, which may be located in various places such as a garage or parking lot belonging to a home of an owner of the EV 10, a parking area for EV charging at a gas station, or a parking area at a shopping mall or office building.

[0080] In addition, the charging station 20 may communicate with a power infrastructure management system, an infrastructure server, or a computing device on the network, which manages the power grid G1 through wired / wireless communication and is capable of performing wireless communication with the EV 10 .

[0081] Wireless communication may include Wi-Fi-based wireless LAN (WLAN)-based communication based on the IEEE 802.11 protocol. Furthermore, wireless communication may include point-to-point signaling (P2PS) communication using LF signals and / or low-power excitation (LPE) signals. Furthermore, the wireless communication scheme between the charging station 20 and the EV 10 may include various communication schemes (such as Bluetooth, Zigbee, and cellular) as well as one or more of the aforementioned communication schemes.

[0082] In addition, the EV 10 and the charging station 20 can perform WPT or charging procedures by exchanging messages in accordance with a data expression format based on Extensible Markup Language (XML) or Valid XML Interchange (EXI). That is, communication for the charging process can be performed between the EVCC 100 and the SECC 200 via a wireless LAN or the like. However, in order to prevent connection failures due to LF signal characteristics during the LF signal-based precise positioning and pairing process, a pairing process combined with precise positioning can be performed in this exemplary embodiment.

[0083] Furthermore, during the communication process for the charging process, the EV 10 may first verify the identity of the charging station 20 to determine whether it is a trusted facility or device, and then establish a secure channel with the SECC 200 of the charging station 20 to protect communications from unauthorized access. The secure channel may be established using Transport Layer Security (TLS). The TLS session may be executed according to the TLS session establishment process after the Internet Protocol (IP)-based communication connection establishment process.

[0084] Figure 2 Is used to describe Figure 1 Schematic diagram of wireless power flow and communication interface between a power supply device (SD) and an EV device (EVD) that can be adopted in a WPT system.

[0085] like Figure 2 As shown, in the wireless power flow between the SD and the EVD, the power supply electronics 252 of the power supply circuit 250 can convert commercial power and transmit it to the primary device 251, the primary device 251 can transmit electromagnetic energy to the secondary device 151 of the EV power supply circuit 150 under the control of the SECC 200, and the power electronics 152 of the EV can convert the induced current generated in the secondary device 151 under the control of the EVCC 110 and supply it to a battery, etc.

[0086] Communication between the EVCC 100 and the SECC 200 may be performed using a wireless local area network (WLAN) link that supports the physical layer and data link layer of the wireless communication interface. In addition, in the communication between the EVCC 100 and the SECC 200, the SECC 200 and the EVCC 100 may perform compatibility analysis and confirmation before initiating a WPT session.

[0087] In the WPT system, message exchange and communication security requirements can be defined for compatibility analysis and verification to meet compatibility requirements. Message exchange requirements can include communication timing requirements, operation timing requirements, etc.

[0088] In addition, the EVCC 100 and the SECC 200 can transmit and receive signals and data through P2PS signaling using the EV device P2PS controller 110 and the power supply device P2PS controller 210. P2PS can include LF signals. Each of the EV device P2PS controller 110 and the power supply device P2PS controller 210 can have at least one or both of an LF transmitter including at least one antenna and an LF receiver including at least one antenna.

[0089] Figure 3 is a flowchart for describing a system model capable of adopting a WPT pairing method according to an exemplary embodiment of the present invention.

[0090] like Figure 3 As shown, the system model may include a single SECC Discovery Protocol (SDP) server 60 and may be configured to use P2PS without a Pairing and Positioning Device (PPD). P2PS may include schemes using LF signals, LPE, optical signals, and the like.

[0091] Specifically, in the system model, the EV 10 equipped with an EVCC can be connected to or associated with the SECC 200 to perform WPT with one EVSE 250 among a plurality of EVSEs paired with the SECC 200. To this end, the SDP server 60 that manages the plurality of SECCs can perform SDP-based communication with the EVCC of the EV 10 through at least one access point (AP). The SDP server 60 can be installed outside the SECC 200 or inside a specific SECC.

[0092] Furthermore, in the system model, the message sequence may follow the SDP, V2G session, precise positioning setup, positioning (or precise positioning), and pairing process in the order described. Positioning may mean aligning the primary and secondary devices.

[0093] In the above system model, "association" may refer to connecting to a target SECC or a correct SECC as "SECC pairing," and "pairing" may refer to identifying the target EVSE or the correct EVSE as "EVSE pairing." In other words, pairing may include checking whether the EVSE located under or corresponding to the EV is controllable. Successful pairing requires correct association.

[0094] Figure 4 It is possible to adopt Figure 3 An exemplary diagram of a WPT system architecture of a WPT pairing method, and Figures 5 to 7 is used to describe Figure 3 An exemplary diagram of the problem of association between SECC and EV in the system model of FIG.

[0095] like Figure 4 As shown, in the WPT system architecture, at least one AP can be connected to at least one SECC, and a specific SECC can be connected to multiple EVSEs (e.g., EVSE1 to EVSE n ), and some of the plurality of EVSEs may be connected to a plurality of EVs (e.g., EV x ,EV y ,EV z ). Multiple EVs may be equipped with multiple corresponding EVCCs (e.g., EVCC x ,EVCC y ,EVCC z). A specific SECC can communicate with multiple EVCCs via wireless LAN.

[0096] like Figures 5 to 7 As shown, when a first EV (hereinafter referred to as “EV1”) approaches or enters a charging station, the SDP server 60 may provide information about a first SECC (ie, SECC1) to the EV via WLAN to configure a WPT V2G communication session.

[0097] That is, the SDP request message (e.g., SDPReq) sent from the SDP server 60 to the EV may include compatibility information and the EVID. Typically, the compatibility information may include information about several compatible SECCs. In addition, the SDP response message (e.g., SDPRes) sent from the EV to the SDP server 60 may include information about a candidate SECC (e.g., the first SECC) selected by the EV.

[0098] However, although the EV needs to establish a V2G communication session with the first SECC, incorrect association in which the EV's location is not properly reflected may frequently occur. Furthermore, even if the EV is associated with the wrong SECC, the EV has no chance of detecting it except in the case of a positioning failure.

[0099] Therefore, in an exemplary embodiment, when positioning or fine positioning is performed, association may be performed simultaneously.

[0100] Figure 8 It is shown that it is applicable to Figure 3 Sequence diagram of the WPT pairing method of the system model.

[0101] like Figure 8 As shown in FIG, the WPT pairing method may be a method for performing LF-based positioning using the wires of the EV. First, the EVCC 100 may provide information about the antenna identifier (ANT_ID) and the effective isotropic radiated power (EIRP) to the SECC 200. Then, the EVCC 100 may transmit an LF signal of a connection admission control (CAC) having the antenna identifier (ANT_ID) set to the P2P controller 210 connected to the SECC 200 via the P2PS 110 controller connected to the EVCC 100.

[0102] Then, when the ANT_ID matches the CAC, the EVCC 100 may receive information on a received signal strength indicator (RSSI) of the LF signal from the SECC 200 .

[0103] Then, the EVCC 100 may perform positioning based on the RSSI. The vehicle controller of the EV may park the EV according to the positioning result of the EVCC 100 (S710).

[0104] Then, the EVCC 100 may send a fine positioning request message (eg, FinePositioningReq) with a result code (ResultCode) parameter set to “SUCC_POSITIONING” to the SECC 200 ( S720 ).

[0105] Then, the EVCC 100 may receive a fine positioning response message (eg, FinePositioningRes) having a response code (ResponseCode) parameter set to “OK” from the SECC 200 ( S730 ).

[0106] Then, the EVCC 100 may transmit a pairing request message (PairingReq) having an identifier code (Observation ID Code) parameter set to the pairing identification code and an EV processing (EVProcessing) parameter set to “Complete” to the SECC 200 ( S740 ).

[0107] Then, the EVCC 100 may receive a pairing response message (PairingRes) having an EV processing (EVProcessing) parameter set to “Complete” and a response code parameter set to “OK” from the SECC 200 ( S750 ).

[0108] Meanwhile, positioning may fail in the following cases: For example, when the EV arrives at a designated point but the SECC cannot receive the LF signal, the SECC may report that there is no signal matching the antenna's identifier (AND_ID).

[0109] As another example, the EV reaches a specified point, but the SECC may report a weak signal. In this case, a weak signal may mean a signal with an intensity equal to or less than a certain threshold, for example, an LF signal with an intensity below a few nanometers.

[0110] In the event of positioning failure, the EVCC 100 may send a fine positioning request message (FinePositioningReq) with a result code parameter set to "Completed" to the SECC 200, and receive a fine positioning response message (FinePositioningRes) with a response code parameter set to "FAILED_POSITIONING" from the SECC 200.

[0111] Furthermore, in an exemplary embodiment, the EVCC 100 may receive a precise positioning response message from the SECC 200, the precise positioning response message including information requesting a return to the precise positioning setup process. Furthermore, the EVCC 100 may also receive a precise positioning response message from the SECC 200 having a response code parameter set to "OK" and including an alternative SECC information (AlternativeSECCInfo) parameter or an alternative SECC list (AlternativeSECCList) parameter.

[0112] Figure 9 Is used to describe Figure 8 FIG1 is an exemplary diagram of an LF precise positioning process that can be adopted in the WPT pairing method.

[0113] like Figure 9 As shown in , in precise positioning using LF signals, since the transmitting coil of the transmitting board and the receiving coil of the receiving board are positioned farther apart, power loss may increase and power transmission efficiency may decrease, and therefore, alignment of both the transmitting coil and the receiving coil is required. Therefore, the vehicle can be positioned so that the two coils are close together, and the two coils can be aligned so that the electromagnetic centers of the two coils coincide.

[0114] First, it can be assumed that two or more LF receivers are installed at or between the corners of the transmission board in the SD, and two or more LF transmitters are installed in the EVD. In this state, when a vehicle approaches a specific parking area for charging, the frequency of the parking area selected by the SECC can be notified to the vehicle via a wireless LAN link.

[0115] The EV device can select a frequency to send a trigger signal to the SD. The SECC can report the received signal strength (RSSI) value sensed for the LF signal to the EVCC. In addition, the EV device can execute a position estimation algorithm based on the RSSI value fed back by the SD.

[0116] The EV device may request vehicle positioning using an LF signal, and the SECC receiving the vehicle positioning request may inform the EV device of a frequency to be used.

[0117] When the driver moves the vehicle to a specific parking space (ie, charging space) and the receiving pad approaches, for example, within 4 to 6 meters from the transmitting pad, the LF receiver of the SD may detect the LF signal transmitted by the LF transmitter of the EV device.

[0118] The SECC connected to the SD can report the measured values ​​to the EVCC of the EV device via WLAN, and the EVCC can dynamically calculate the position of the sending board based on the measured values. Based on the calculated position, it is possible to perform positioning and alignment of the EV.

[0119] Figure 10 It is shown in Figure 8 Flowchart of the V2G communication process that can be used in the WPT pairing method.

[0120] The communication between the EVCC and the SECC can be configured as follows. That is, when an EV arrives at a charging station and detects a WLAN according to preconfigured rules, the EVCC that complies with compatibility level A can configure the physical layer and data link layer (i.e., OSI layers 1 and 2) according to the preconfigured rules to connect to the SECC that supports compatibility level A.

[0121] When connecting to a WLAN, the aforementioned processes related to the OSI layer may be activated, and may be associated with OSI layers 3 through 7. The aforementioned "communication configuration" operations may include transitioning the power supply device to a specific state and the EV device to a specific state, and must be successfully executed before other operations can begin. Meanwhile, if two or more WLANs exist and are detected by the EVCC, the EVCC may determine the appropriate WLAN link based on its various rules.

[0122] like Figure 10 As shown, an Internet Protocol (IP) address may be first assigned to an EV based on a WLAN connection (S910). After indicating a successful data link establishment, the SECC may initiate an address allocation mechanism. The SECC may utilize an appropriate mechanism to configure a static or dynamic IP address.

[0123] Then, the SECC may activate a pre-configured SECC discovery service according to the EV method to discover a specific SECC among the multiple SECCs (S920). The SECC discovery service may not be implemented directly by the SECC, but may be implemented by a separate device that provides the service.

[0124] In step S920, when the first communication configuration timer is greater than or equal to the first communication configuration time, the SECC may stop the SDP server. When the second communication configuration timer is greater than or equal to the second communication configuration execution time, the SECC may stop the IP address allocation mechanism. After the SDP server is successfully started, the SECC may wait for the transport layer security (TLS) connection to be initialized according to the SDP response message and wait for the TLS connection to be established. When the second communication configuration timer becomes greater than or equal to the second communication configuration execution time, the SECC may stop waiting for the TLS connection to be established. In addition, after the TLS connection is established, the SECC may wait for the initialization of the V2G communication session.

[0125] When the above operations are completed, SECC can perform TCP / TLS connection establishment (S930). After the TLS connection is successfully established, SECC can stop the SDP server.

[0126] Then, the SECC may perform a V2G communication session with the EVCC (S940).In an exemplary embodiment, the V2G communication session may correspond to a WPT session.

[0127] The V2G communication session may include a precise positioning setup step S942 associated with WPT, a precise positioning and pairing step S944, an authorization and service selection step 946, a final compatibility check step, an alignment check step, and the like.

[0128] After the session setup (SessionSetup) is completed, in the fine positioning setup step S942, the EVCC may send a fine positioning setup request message (WPT_FinePositioningSetupReq) to determine the SECC's options for supporting fine positioning, pairing, and alignment checking. Here, the SECC may respond to the request message with a fine positioning setup response message (WPT_FinePositioningSetupRes) including information about available options related to fine positioning, pairing, and alignment checking. After analyzing the available options, the EVCC may send a fine positioning setup request message to the SECC including information about the options selected for fine positioning, pairing, and alignment checking to be performed in the EV. The SECC may then respond to the EV's selection with a fine positioning setup response message to confirm or "OK."

[0129] The available options may include an EV device fine positioning method list (EVDeviceFinePositioningMethodList), an EV device pairing method list, and an EV device alignment check method list (EVDeviceAlignmentCheckMethodList). The EV device fine positioning method list may include "Manual", "Use LF signal sent by EV (LF_TxEV)", "Use LF signal sent by primary device (LF_TxPrimaryDevice)", "Apply LPE", "Proprietary", etc. The EV device pairing method list may include "External confirmation", "Apply LPE", "Use LF signal sent by EV (LF_TxEV)", "Use LF signal sent by primary device (LF_TxPrimaryDevice)", "Optical", "Proprietary", etc.

[0130] In the fine positioning and pairing step S944, the EVCC may notify the SECC to select available options via a fine positioning request message (WPT_FinePositioningReq). In an exemplary embodiment, the EV device may select one of "LF_TxEV" or "LF_TxPrimary device" as the fine positioning method and pairing method.

[0131] Describing the fine positioning and pairing step S944 in more detail, the EVCC of the EV operating as a transmitter transmitting an LF signal may be configured to send a fine positioning request message (FinePositioningReq) including information about an identifier of a first antenna among a plurality of EVSEs connected to the SECC and a first operating frequency of the first EVSE; transmit the LF signal to a primary device of the first EVSE at the first operating frequency; receive information about the LF signal at the EVSE from the SECC through a fine positioning response message (FinePositioningRes); dynamically calculate a position of the primary device of a second EVSE having a maximum LF signal value based on the information about the LF signal at the EVSE; and park the EV when an LF signal indicating that the secondary device of the EV is located within an alignment tolerance range from the primary device of the second EVSE is detected. When the second EVSE is the same EVSE as the first EVSE indicated by the fine positioning request message or the fine positioning setup response message, the EVCC may send a pairing request message (PairingReq) with the identifier code (ObservedIDcode) parameter set to the pairing identification code (PairingIDCode) and an EV processing (EVProcessing) parameter set to “Completed” to the SECC immediately after sending the fine positioning request message (FinePositioningResq) with the result code (ResultCode) parameter set to “Success” to the SECC and receiving the fine positioning response (FinePositioningRess) with the response code parameter set to “OK”.

[0132] Furthermore, as a device implementing the WPT pairing method, the EVCC may receive a pairing response message (PairingRes) having an EV processing parameter set to “Complete” and a response code parameter set to “OK” from the SECC.

[0133] Here, when the second EVSE having the maximum LF signal value is different from the first EVSE indicated by the fine positioning request message or the fine positioning setup request message (FinePositioningSetupReq), but the second EVSE has the same configuration as the first EVSE, the SECC may change the identifier of the second antenna of the second EVSE to the identifier of the first antenna of the first EVSE, and control the internal connection between the second antenna of the second EVSE and the first antenna of the first EVSE to be changed.

[0134] In addition, when the second EVSE having the maximum LF signal value is an EVSE different from the first EVSE indicated by the fine positioning request message or the fine positioning setup response message (FinePositioningSetupRes), the second EVSE is an EVSE configured differently from the first EVSE, and the EVCC may receive from the SECC a fine positioning response message including information requesting a return of the fine positioning setup process, or may receive from the SECC a fine positioning response message having a response code (ResponseCode) parameter set to “OK” and including an alternative SECC information (AlternativeSECCInfo) parameter or an alternative SECC list (AlternativeSECCList) parameter.

[0135] Furthermore, the EVCC may be configured to transmit the LF signal of the CAC set to the same antenna identifier (ANT_ID) or antenna identifier code (IDCode) to the SECC through P2PS signaling between the EVCC and the SECC.

[0136] Furthermore, the second EVSE may receive the LF signal having a strength exceeding a certain threshold through all antennas for LF signal reception, and may be an EVSE having a maximum LF signal value among the EVSEs.

[0137] In another embodiment, the SECC acts as a SECC that performs fine positioning and pairing with the EVCC of the EV that operates as a transmitter that transmits LF signals. The SECC may be configured to: send a fine positioning setup response message (FinePositioningSetupRes) including information about identifiers of antennas of a plurality of EVSEs connected to the SECC, positions and directions of the antennas, and operating frequencies to the EVCC in response to a fine positioning setup request message of the EVSE; receive information about the identifier of the first antenna and information about the EIRP of the antennas of the secondary devices of the EV from the EVCC through a fine positioning request message (FinePositioningReq); activate the LF receiver of the corresponding EVSE to receive the LF signal for fine positioning from the EV, and receive the LF signal with the identifier of the first antenna through P2PS signaling; determine whether the identifier of the first antenna is the same as a pre-stored antenna identifier or identifier code (ObservedIDCode); and when the first antenna is When the identifier and the identification code of the second EVSE are the same, information about the RSSI of the LF signal at the EVSE is sent to the EVCC, a fine positioning request (FinePositioningReq) message with a result code (ResultCode) parameter set to "success" is received from the EVCC, and in response to the fine positioning request message, a fine positioning response (FinePositioningRes) message with a response code (ResponseCode) parameter set to "OK" is sent to the EVCC; and when the second EVSE having the largest LF signal value among the EVSEs is the same as the first EVSE corresponding to the identifier of the first antenna indicated by the fine positioning setup response message or the fine positioning request message, a pairing request (PairingReq) message is received from the EVCC, the pairing request (PairingReq) message having an identifier code parameter set to the pairing identification code and an EV processing (EVProcessing) parameter set to "completed".

[0138] Furthermore, when the second EVSE is the same as the first EVSE, the SECC may send a pairing response (PairingRes) message having an EV Handling parameter set to “Done” and a Response Code parameter set to “OK” to the EVCC.

[0139] In addition, when the second EVSE is an EVSE different from the first EVSE and the second EVSE is an EVSE having the same configuration as the first EVSE, the SECC may change the identifier of the second antenna of the second EVSE to the identifier of the first antenna of the first EVSE; and control the internal connection between the second antenna of the second EVSE and the first antenna of the first EVSE to be changed.

[0140] In addition, when the second EVSE is an EVSE different from the first EVSE and the EVSE is an EVSE with a configuration different from that of the first EVSE, the SECC may send a positioning setting response message including information requesting a return of the precise positioning setting process to the EVCC; or may send a precise positioning response message having a response code (ResponseCode) parameter set to "OK" and including an alternative SECC information (AlternativeSECCInfo) parameter or an alternative SECC list (AlternativeSECCList) parameter to the EVCC.

[0141] In another embodiment, the SECC functions as a SECC that performs fine positioning and pairing with the EVCC of the EV when operating as a transmitter that transmits LF signals. The SECC may be configured to: transmit a fine positioning setup response message (FinePositioningSetupRes) to the EVCC in response to a fine positioning setup request message, the fine positioning setup response message including information about identifiers and operating frequencies of antennas of a plurality of EVSEs connected to the SECC; control a first EVSE arbitrarily selected from the EVSEs to transmit the LF signal for positioning; and receive a pairing request (PairingReq) message having an identifier code (ObservedIDcode) parameter set to a pairing identification code from the EVCC, and immediately upon receiving the fine positioning request message (FinePositioningResq) having a result code parameter set to “success,” set the EV handling parameter to “complete,” and transmit a fine positioning response message (FinePositioningRess) having a response code parameter set to OK in response to the fine positioning request message.

[0142] Furthermore, the SECC may send a pairing response message (PairingRes) having an EV processing parameter set to “Done” and a response code parameter set to OK to the EVCC in response to the pairing request message.

[0143] Furthermore, when a reception result of the LF signal received from the EV is less than a reference value, the SECC may be configured to: control a second EVSE having the same antenna configuration as the first EVSE among the EVSEs indicated by the precise positioning setup response message to transmit an LF signal having the same antenna identifier; and when the EVSE having the largest LF signal value for the LF signal among the EVSEs is the second EVSE, change the identifier of the second antenna of the second EVSE to the identifier of the first antenna of the first EVSE, and control an internal connection between the second antenna of the second EVSE and the first antenna of the first EVSE to be changed.

[0144] In addition, when the EVSE having the maximum LF signal value for the LF signal is not the second EVSE, has a configuration different from that of the second EVSE, or the LF signal value is less than a specific threshold, the SECC may be configured to send a positioning setting response message including information requesting a return of the precise positioning setting process to the EVCC; or send a precise positioning response message having a response code (ResponseCode) parameter set to "OK" and including an alternative SECC information (AlternativeSECCInfo) parameter or an alternative SECC list (AlternativeSECCList) parameter to the EVCC.

[0145] In addition, the SECC may determine whether the CAC in the LF signal transmitted by the EVCC through P2PS signaling maintains the same antenna identifier (ANT_ID) or antenna identifier code (IDCode).

[0146] In another embodiment, the EVCC acts as an EVCC that performs fine positioning and pairing with the SECC that operates as a transmitter that transmits LF signals, and the EVCC may be configured to send a fine positioning request message (FinePositioningReq) including information about an identifier (ANT_ID) of a first antenna and an EIRP of a secondary device of the EV to the SECC; receive an LF signal from a primary device of any first EVSE selected from the EVSE connected to the SECC; send an LF signal to the SECC through P2PS signaling, the LF signal having a CAC set to an identifier of the first antenna identifier or an identifier code (IDCode) of the first antenna; send information about an RSSI detected at the secondary device of the EV to the SECC; dynamically calculate a position of the primary device based on the RSSI; and stop and park the EV in response to acquiring a signal or RSSI indicating that the secondary device is located within an alignment tolerance range from the primary device.

[0147] In addition, the EVCC may send a pairing request message (PairingReq) having an identifier code (ObservedIDcode) parameter set to the pairing identification code and an EV processing (EVProcessing) parameter set to "Completed" to the SECC immediately after sending a precise positioning request message having a result code (ResultCode) parameter set to "Positioning Successful" to the SECC and receiving a precise positioning response message having a response code (ResponseCode) parameter set to "OK" from the SECC. In addition, the EVCC may receive a pairing response (PairingRes) message having an EV processing parameter set to "Completed" and a response code parameter set to "OK" from the SECC.

[0148] In addition, when no signal or RSSI value indicating that the secondary device is located within the alignment tolerance range from the primary device is identified, the EVCC can be configured to send a precise positioning request message with a result code parameter set to "positioning failure" to the SECC; and receive a precise positioning response message from the SECC with a response code parameter set to "OK" and including an alternative SECC information (AlternativeSECCInfo) parameter or an alternative SECC list (AlternativeSECCList) parameter.

[0149] The existing process or configuration may be used as it is in the above-mentioned authorization and service selection step 946, the final compatibility check step, the alignment check step, etc., and thus a detailed description thereof will be omitted.

[0150] At the same time, after terminating the V2G communication session, the SECC can terminate the TLS connection. Here, if value-added services are used, the SECC can determine the appropriate time to close the communication channel.

[0151] Figure 11 is a schematic block diagram for describing main components of a WPT pairing device according to another exemplary embodiment of the present disclosure.

[0152] like Figure 11 As shown, the WPT pairing device 300 may be a device installed as part of an EVCC or SECC, a device incorporated within an EVCC or SECC, or a functional unit that performs functions corresponding to the functions of the device, and may include at least one processor 310 and a storage device 320. Furthermore, the WPT pairing device 300 may also include an input interface 330, an output interface 340, and a memory 350. Furthermore, the WPT pairing device 300 may include a communication interface 360. The communication interface 360 ​​may correspond to a transmitting / receiving device for network access.

[0153] The processor 310 may execute program instructions stored in the storage device 320 and / or the memory 350. The processor 310 may be implemented as at least one central processing unit (CPU) or a graphics processing unit (GPU), or as other processors capable of executing the method according to the present invention.

[0154] The storage device 320 may include, for example, a volatile memory such as a read-only memory (ROM) and a nonvolatile memory such as a random access memory (RAM). The storage device 320 may load program instructions stored in the memory 350 and provide the loaded program instructions to the processor 310.

[0155] The memory 350 is a recording medium suitable for storing program instructions and data, such as a magnetic medium such as a hard disk, a floppy disk, and a magnetic tape, an optical medium such as a compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a magneto-optical medium such as a floppy disk, or a semiconductor memory such as a flash memory, an erasable programmable ROM (EPROM), or a solid-state drive (SSD) manufactured based thereon.

[0156] The memory 350 may store program instructions. The program instructions may include program instructions for WPT pairing according to the present disclosure. The program instructions for WPT may be implemented so that the processor 310 executes the above-referenced instructions in a state where they are loaded into the processor 310 when executed by the processor 310. Figure 10 Describe the precise positioning and pairing process.

[0157] Meanwhile, functions or configurations of the input interface 330 , the output interface 340 , and the communication interface 360 ​​are obvious to those skilled in the art to which the present disclosure pertains, and thus detailed descriptions thereof are omitted.

[0158] Meanwhile, the active pairing method described in the above exemplary embodiment can be implemented as a computer-readable program or code on a computer-readable recording medium. Computer-readable recording media include all types of storage devices that store data readable by a computer system. In addition, the computer-readable recording medium can be distributed to computer systems connected via a network, thereby storing and executing the computer-readable program or code in a distributed manner.

[0159] Computer readable recording media may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory. The program instructions may include high-level language codes that can be executed by a computer using an interpreter or the like, as well as machine codes generated by a compiler.

[0160] Some aspects of the present disclosure have been described above in the context of equipment, but some aspects of the present disclosure can be described using a method corresponding thereto. Here, a block or device corresponds to the operation of the method or the characteristic of the operation of the method. Similarly, the aspects of the present invention described above in the context of the method can be described using a block or project corresponding thereto or the characteristic of a device corresponding thereto. Some or all of the operation of the method can be performed, for example, by (or using) a hardware device (such as a microprocessor, a programmable computer or an electronic circuit). In some embodiments, at least one of the most important operations of the method can be performed by such a device.

[0161] In an exemplary embodiment, a programmable logic device (e.g., a field programmable gate array) may be used to perform some or all of the functionality of the methods described herein. In an embodiment, a field programmable gate array may be operated by a microprocessor to perform one of the methods described herein. Typically, the method is preferably performed by a hardware device.

[0162] Although the present disclosure has been described above with reference to the embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the technical concept and scope of the present disclosure defined in the appended claims.

Claims

1. A method for pairing an electric vehicle (EV) with a power supply equipment communication controller (SECC), the method comprising: Sending a fine positioning request message FinePositioningReq to the SECC, the fine positioning request message including information about an identifier of a first antenna in an EVSE connected to the SECC and a first operating frequency of a first electric vehicle supply equipment EVSE; sending a low frequency LF signal at the first operating frequency to a primary device of a first EVSE; receiving information about the LF signal at the EVSE from the SECC via a fine positioning response message FinePositioningRes; dynamically calculating a location of a primary device of a second EVSE having a maximum LF signal value based on information about the LF signal at the EVSE; parking the EV when an LF signal is detected indicating that a secondary device of the EV is within an alignment tolerance from a primary device of the second EVSE; determining whether the second EVSE is the same as the first EVSE indicated by the precise positioning request message or the precise positioning setup response message; as well as Immediately after sending a precise positioning request message with the result code ResultCode parameter set to success to the SECC and receiving a precise positioning response message with the response code ResponseCode parameter set to OK from the SECC, a pairing request message with the identifier code ObservedIDcode parameter set to the pairing identification code and the EV processing EVProcessing parameter set to completed is sent to the SECC.

2. The method according to claim 1, further comprising: A pairing response message PairingRes is received from the SECC with the EV Processing parameter set to Done and the Response Code parameter set to OK.

3. The method according to claim 1, further comprising: When the second EVSE having the maximum LF signal value is different from the first EVSE indicated by the fine positioning request message or the fine positioning setup request message FinePositioningSetupRes, and the second EVSE has the same configuration as the first EVSE, The SECC is allowed to change the identifier of the second antenna of the second EVSE to the identifier of the first antenna of the first EVSE, and control the internal connection between the second antenna of the second EVSE and the first antenna of the first EVSE to be changed.

4. The method according to claim 1, further comprising: When the second EVSE having the maximum LF signal value is different from the first EVSE indicated by the fine positioning request message or the fine positioning setup response message FinePositioningSetupRes, and the second EVSE is an EVSE having a configuration different from that of the first EVSE, receiving a precise positioning response message from the SECC including information requesting a return to the precise positioning setup procedure; or A pinpoint positioning response message is received from the SECC having a response code parameter set to OK and including an alternative SECC information AlternativeSECCInfo parameter or an alternative SECC list AlternativeSECCList parameter.

5. The method according to claim 1, further comprising: The LF signal of the connection admission control CAC having the same antenna identifier ANT_ID or antenna identifier code IDCode set is transmitted to the SECC through point-to-point signal P2PS signaling between the electric vehicle communication controller EVCC of the EV and the SECC.

6. The method according to claim 1, wherein The maximum LF signal value is equal to or greater than a specific threshold, the second EVSE receives the LF signal having a strength exceeding the specific threshold through all antennas for LF signal reception, and the second EVSE has the maximum LF signal value among the EVSEs.

7. A method for pairing a power supply equipment communication controller (SECC) with an electric vehicle communication controller (EVCC) of an electric vehicle (EV), the method comprising: In response to the fine positioning setup request message FinePositioningSetupReq, sending a fine positioning setup response message FinePositioningSetupRes to the EVCC, the fine positioning setup response message including information about an antenna identifier, a position and direction of the antenna, and an operating frequency of each electric vehicle supply equipment (EVSE) connected to the SECC; receiving information about an identifier of a first antenna and information about an effective isotropically radiated power (EIRP) of an antenna of a secondary device of the EV from the EVCC through a fine positioning request message FinePositioningReq; activating the LF receiver of each of the EVSEs to receive a low frequency LF signal for precise positioning from the EV; receiving, through point-to-point signal P2PS signaling, an LF signal having an identifier of the first antenna; Determining whether the identifier of the first antenna is the same as a pre-stored antenna identifier or identifier code ObservedIDCode; When the identifier of the first antenna is identical to the identifier code, transmitting information about a received signal strength indicator (RSSI) of the LF signal at the EVSE to the EVCC; receiving, from the EVCC, a fine positioning request message FinePositioningReq with a result code ResultCode parameter set to success; In response to the fine positioning request message, sending a fine positioning response message FinePositioningRes with a response code ResponseCode parameter set to OK to the EVCC; as well as When a second EVSE having a maximum LF signal value among the EVSEs is identical to a first EVSE corresponding to the identifier of the first antenna indicated by the precise positioning setup response message or the precise positioning request message, a pairing request message PairingReq having an identifier code parameter set to a pairing identification code and an EV processing EVProcessing parameter set to completed is received from the EVCC.

8. The method according to claim 7, further comprising: When the second EVSE is the same as the first EVSE, a pairing response message PairingRes having an EV Handling parameter set to Done and a Response Code parameter set to OK is sent to the EVCC.

9. The method according to claim 7, further comprising: When the second EVSE is an EVSE different from the first EVSE and the second EVSE is an EVSE having the same configuration as the first EVSE, changing the identifier of the second antenna of the second EVSE to the identifier of the first antenna of the first EVSE; and An internal connection between the second antenna of the second EVSE and the first antenna of the first EVSE is controlled to be changed.

10. The method according to claim 7, further comprising: When the second EVSE is an EVSE different from the first EVSE and the second EVSE is an EVSE having a configuration different from that of the first EVSE, sending a precise positioning response message including information requesting a return to the precise positioning setup procedure to the EVCC; or A pinpoint positioning response message having a response code ResponseCode parameter set to OK and including an alternative SECC information AlternativeSECCInfo parameter or an alternative SECC list AlternativeSECCList parameter is sent to the EVCC.

11. A method for pairing a power supply equipment communication controller (SECC) with an electric vehicle communication controller (EVCC) of an electric vehicle (EV), the method comprising: In response to a fine positioning setup request message FinePositioningSetupReq, sending a fine positioning setup response message FinePositioningSetupRes to the EVCC, the fine positioning setup response message including information about an identifier and an operating frequency of an antenna of each electric vehicle supply equipment (EVSE) connected to the SECC; controlling a first EVSE arbitrarily selected from the EVSEs to transmit a low frequency (LF) signal for positioning; receiving, from the EVCC, a fine positioning request message FinePositioningReq with a result code ResultCode parameter set to success; as well as Immediately after sending a fine positioning response message FinePositioningRes with the result code ResultCode parameter set to OK to the EVCC in response to the fine positioning request message, receiving a pairing request message with the identifier code ObservedIDcode parameter set to the pairing identification code and the EVProcessing parameter set to completed from the EVCC.

12. The method according to claim 11, further comprising: In response to the pairing request message, a pairing response message PairingRes having an EVProcessing parameter set to Done and a ResponseCode parameter set to OK is sent to the EVCC.

13. The method according to claim 11, further comprising: controlling a second EVSE having the same antenna configuration as the first EVSE among the EVSEs indicated by the precise positioning setup response message to transmit a LF signal having the same antenna identifier when a reception result of the LF signal received from the EV at the secondary device of the EV is less than a reference value; and When the EVSE having the maximum LF signal value for the LF signal among the EVSEs is the second EVSE, an identifier of the second antenna of the second EVSE is changed to an identifier of the first antenna of the first EVSE, and an internal connection between the second antenna of the second EVSE and the first antenna of the first EVSE is controlled to be changed.

14. The method according to claim 13, further comprising: When the EVSE having the maximum LF signal value for the LF signal is not the second EVSE and has a configuration different from that of the second EVSE, or when the LF signal value is less than a specific threshold, sending a positioning setup response message including information requesting a return to the precise positioning setup procedure to the EVCC; or A pinpoint positioning response message having a response code ResponseCode parameter set to OK and including an alternative SECC information AlternativeSECCInfo parameter or an alternative SECC list AlternativeSECCList parameter is sent to the EVCC.

15. The method according to claim 11, further comprising: It is determined whether the connection admission control CAC in the LF signal transmitted by the EVCC through the point-to-point signal P2PS signaling maintains the same antenna identifier ANT_ID or antenna identifier code IDCode.

16. A method executed by an electric vehicle communication controller (EVCC) for pairing with a power supply equipment communication controller (SECC), the method comprising: Sending a fine positioning request message FinePositioningReq to the SECC, the fine positioning request message including information about an identifier ANT_ID of the first antenna and an effective isotropically radiated power EIRP of a secondary device of the electric vehicle EV; receiving a low frequency (LF) signal from a primary device of any first electric vehicle supply equipment (EVSE) selected from the EVSE connected to the SECC; sending a connection admission control CAC LF signal having an identifier set as a first antenna identifier or an identifier code IDCode of the first antenna to the SECC through point-to-point signal P2PS signaling; sending information about a received signal strength indicator (RSSI) detected at a secondary device of the EV to the SECC; dynamically calculating the location of the primary device based on the RSSI; stopping and parking the EV in response to acquiring a signal or RSSI indicating that the secondary device is within an alignment tolerance from the primary device; as well as Immediately after sending a precise positioning request message with the result code ResultCode parameter set to positioning success to the SECC and receiving a precise positioning response message with the response code ResponseCode parameter set to OK from the SECC, a pairing request message PairingReq with the identifier code ObservedIDcode parameter set to the pairing identification code and the EV processing EVProcessing parameter set to completed is sent to the SECC.

17. The method according to claim 16, further comprising: A pairing response message PairingRes is received from the SECC with the EV Processing parameter set to Done and the Response Code parameter set to OK.

18. The method according to claim 16, further comprising: When no signal or RSSI value indicating that the secondary device is within an alignment tolerance range from the primary device is identified in parking of the EV, sending a precise positioning request message to the SECC with a result code parameter set to positioning failure; and A pinpoint positioning response message is received from the SECC having a response code parameter set to OK and including an alternative SECC information AlternativeSECCInfo parameter or an alternative SECC list AlternativeSECCList parameter.

19. A wireless power transmission pairing device, included in a power supply equipment communication controller (SECC), the SECC configured to perform pairing with an electric vehicle communication controller (EVCC) in wireless power transmission between an electric vehicle (EV) and a power grid, the wireless power transmission pairing device comprising: processor; as well as a memory storing instructions executable by the processor, When executed by the processor, the instructions cause the processor to execute: sending precise positioning related messages to the EVCC and receiving precise positioning related messages from the EVCC to align a secondary device of the EV within an alignment tolerance range from a primary device of an electric vehicle supply equipment (EVSE) connected to the SECC; receiving a connection admission control CAC low frequency LF signal having an identifier ANT_ID or an antenna identifier code IDCode set as a first antenna from the EVCC through point-to-point signal P2PS signaling; and After receiving a pairing request message PairingReq with a result code ResultCode parameter set to success from the EVCC and sending a fine positioning response message FinePositioningRes with a response code ResponseCode parameter set to OK to the EVCC, a pairing request message PairingReq with an identifier code ObservedIDcode parameter set to the pairing identification code and an EV processing EVProcessing parameter set to completed is sent from the EVCC.

20. The wireless power transmission pairing device according to claim 19, wherein: The instructions cause the processor to further execute: sending a pairing response message PairingRes having an EVProcess parameter set to Done and a ResponseCode parameter set to OK to the EVCC.

21. The wireless power transmission pairing device according to claim 19, wherein: The instructions cause the processor to further execute: controlling a first EVSE arbitrarily selected from among the EVSEs connected to the SECC to transmit a low frequency (LF) signal for precise positioning; controlling a second EVSE having the same antenna configuration as the first EVSE among the EVSEs indicated by the precise positioning request message or the precise positioning setup response message to transmit a LF signal having the same antenna identifier when a reception result of the LF signal received from the EV at the secondary device of the EV is less than a reference value; receiving a fine position request message FinePositioningReq having a result code ResultCode parameter set to success from the EVCC of the EV that has stopped and parked after performing fine positioning based on the LF signal; and When the EVSE having the maximum LF signal value for the LF signal is the second EVSE, an identifier of the second antenna of the second EVSE is changed to an identifier of the first antenna of the first EVSE, and an internal connection between the second antenna of the second EVSE and the first antenna of the first EVSE is controlled to be changed.

22. The wireless power transmission pairing device according to claim 19, wherein: The instructions cause the processor to further execute: receiving, from the EVCC, a precise positioning request message having a result code parameter set to positioning failure; and In response to the precise positioning request message, a precise positioning response message having a response code ResponseCode parameter set to OK and including an alternative SECC information AlternativeSECCInfo parameter or an alternative SECC list AlternativeSECCList parameter is sent to the SECC.

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