Method and apparatus for early renegotiation in message sequence between electric vehicle and power grid

Abstract

The present disclosure discloses an early renegotiation method and apparatus capable of quickly changing a communication state according to a change in a charging condition or a charging environment that can occur when a message exchange or a charging process is performed between an electric vehicle and a power grid. A method of an electric vehicle performing early renegotiation in a message sequence between the electric vehicle and the power grid includes the steps of: receiving a service detail response message from a power supply device communication controller; searching for parameters compatible with direct current charging or alternating current charging based on the service detail response message; if no compatible parameters are found, changing a service detail state to a vehicle positioning establishment state in which vehicle positioning is established by using an automatic connection device or wireless power transmission; and transmitting a vehicle positioning establishment request message to the power supply device communication controller in the vehicle positioning establishment state.

Description

Technical Field

[0001] This disclosure relates to a method for changing charging parameters or charging processes during message exchange or charging processes between an electric vehicle and a power grid, and more particularly, to a method and apparatus for early renegotiation of communication states to rapidly change them based on changes in charging conditions or charging environment that may occur during message exchange or charging processes between an electric vehicle and a power grid. Background Technology

[0002] The message sequence between the power grid and the electric vehicle (EV) can be performed in the form of a pair of pre-defined request messages and pre-defined response messages exchanged between the power supply equipment communication controller (SECC) located in the grid and the electric vehicle communication controller (EVCC) installed on the EV.

[0003] EVs typically use charging schemes based on automatic connectivity devices or wireless power transmission, AC charging schemes, or DC charging schemes to charge their vehicle batteries. To charge the battery, EVs can exchange messages with the SECC regarding session establishment, vehicle location establishment, vehicle positioning, pairing, authorization establishment, authorization, service discovery, service details, and service selection.

[0004] For example, after the EV receives the vehicle location establishment response message, if the EV does not find a compatible method for location or pairing for automatic connection of devices or wireless power transmission, the EV can transition from the session-stopped state to the service-discovered state through service renegotiation.

[0005] However, in the message sequence between the EV and the grid described in ISO 15118-20, there is a limitation that the communication state cannot be changed rapidly in response to changes in the charging conditions or charging environment that occur during the current charging process or during the charging process. Summary of the Invention

[0006] [Technical Issues]

[0007] In order to meet the needs of the prior art, the purpose of this disclosure is to provide a method and apparatus for early renegotiation in a message sequence between an electric vehicle and a power grid.

[0008] Another object of this disclosure is to provide a method and apparatus for early renegotiation of communication states that can be rapidly changed based on changes in charging conditions or charging environment that may occur during message exchange or charging processes between an electric vehicle and a power grid.

[0009] [Technical Solution]

[0010] As an early renegotiation method performed by an electric vehicle in a message sequence between the electric vehicle and the power grid, an early renegotiation method according to one aspect of this disclosure for achieving technical objectives may include: receiving a service details response message from a power supply equipment communication controller (SECC); searching for compatible parameters for DC charging or AC charging based on the service details response message; changing the state from a service details state to a vehicle location establishment state for vehicle location using an automatic connection device or wireless power transmission in response to the failure to find compatible parameters; and sending a vehicle location establishment request message to the SECC in the vehicle location establishment state.

[0011] A state change can be performed when a session stop response message with a response code of "OK" is received in the state where the charging progress parameter of the final session stop request message in the previous sequence is set to "Renegotiation" or "ServiceRenegotiation".

[0012] Sending a vehicle location establishment request message to the SECC can be executed within a preset sequence performance timeout period.

[0013] The early renegotiation method may further include sending and receiving messages for service discovery via SECC before receiving the service details response message.

[0014] The early renegotiation method may further include establishing a transport layer security (TLS) connection before receiving a service details response message.

[0015] The early renegotiation method may further include sending a Support Application Protocol (SAP) request message to the SECC after the TLS connection is completed.

[0016] The early renegotiation method may further include sending a session establishment request message to the SECC within a preset sequence performance timeout period after receiving an SAP response message to an SAP request message.

[0017] As an early renegotiation method performed by the electric vehicle in a message sequence between the electric vehicle and the power grid, an early renegotiation method according to another aspect of this disclosure for achieving technical objectives may include: receiving a vehicle location establishment response message from a power supply equipment communication controller (SECC); searching for a compatible method for locating or pairing with an automated connection device or wireless power transmission; in response to the unavailability of a compatible method, transitioning from a vehicle location establishment state to an authorized establishment state for DC charging or AC charging; and sending an authorized establishment request message to the SECC in the authorized establishment state.

[0018] When a session stop response message with a response code of "OK" is received in the state of the previous final session stop request message with the charging progress parameter set to "Renegotiation" or "ServiceRenegotiation", a jump can be performed.

[0019] Sending an authorization establishment request message to SECC can be executed within the preset sequence performance timeout period.

[0020] The early renegotiation approach may further include sending a service discovery request message to the SECC after sending an authorization establishment request message to the SECC.

[0021] The early renegotiation method may further include establishing a transport layer security (TLS) connection before receiving a vehicle location establishment response message.

[0022] The early renegotiation method may further include sending a Support Application Protocol (SAP) request message to the SECC after the TLS connection is completed.

[0023] The early renegotiation method may further include sending a session establishment request message to the SECC within a preset sequence performance timeout period after receiving an SAP response message to an SAP request message.

[0024] As an early renegotiation method performed by an electric vehicle in a message sequence between the electric vehicle and the power grid, an early renegotiation method according to another aspect of this disclosure for achieving technical objectives may include: receiving a service details response message from a power supply equipment communication controller (SECC); searching for compatible parameters for DC charging or AC charging based on the service details response message; in response to not finding compatible parameters, transitioning from a service details state to a vehicle positioning establishment state for vehicle positioning using an automated connection device or wireless power transmission; sending a vehicle positioning establishment request message to the SECC in the vehicle positioning establishment state; receiving a vehicle positioning establishment response message from the SECC; searching for compatible methods for positioning or pairing with the automated connection device or wireless power transmission; in response to a compatible method being unavailable, changing the state from the vehicle positioning establishment state to an authorized establishment state for DC charging or AC charging; and sending an authorized establishment request message to the SECC in the authorized establishment state.

[0025] When a session stop response message with a response code of "OK" is received while the charging progress parameter of the previous session stop request message is set to "ServiceRenegotiation", a state change or transition can be performed.

[0026] As an apparatus for performing early renegotiation in a message sequence between an electric vehicle and the power grid, an early renegotiation apparatus for achieving a technical objective according to another aspect of this disclosure may include: a memory storing program instructions; and a processor connected to the memory and executing the program instructions stored in the memory, wherein when executed by the processor, the program instructions may cause the processor to: receive a service details response message from a power supply equipment communication controller (SECC); search for compatible parameters for DC charging or AC charging based on the service details response message; in response to not finding compatible parameters, transition from a service details state to a vehicle positioning establishment state for vehicle positioning using an automated connection device or wireless power transmission; send a vehicle positioning establishment request message to the SECC in the vehicle positioning establishment state; receive a vehicle positioning establishment response message from the SECC; search for a compatible method for positioning or pairing for an automated connection device or wireless power transmission; change the state from the vehicle positioning establishment state to an authorized establishment state in response to the unavailability of a compatible method, so as to perform DC charging or AC charging; and send an authorized establishment request message to the SECC in the authorized establishment state.

[0027] When a session stop response message with a response code of "OK" is received while the charging progress parameter of the final session stop request message in the previous sequence is set to "ServiceRenegotiation", the program instructions can further change or jump the processor execution state.

[0028] [Beneficial Effects]

[0029] According to the above-described solution to the problem, an early renegotiation method and apparatus are provided, which can rapidly change the communication state in response to changes in charging conditions or charging environment that may occur during message exchange between the EV and the power grid or during the execution of the charging process.

[0030] Furthermore, according to this disclosure, the message sequence between the EV and the power grid is made more flexible and adaptable to changes in charging conditions or the environment, thereby increasing user convenience and efficiency in message exchange during the charging process. Attached Figure Description

[0031] Figure 1 This is a conceptual diagram illustrating an EV wireless power transmission structure to which an early renegotiation method, according to exemplary embodiments of the present disclosure, can be applied.

[0032] Figure 2 This is a conceptual diagram illustrating an EV wired charging structure to which an early renegotiation method, according to exemplary embodiments of the present disclosure, can be applied.

[0033] Figure 3This is a block diagram illustrating the message sequence of the vehicle-to-grid (V2G) communication status in a comparative example.

[0034] Figure 4 This is a flowchart describing an early renegotiation method (hereinafter referred to as the "early renegotiation method") performed in a message sequence between an EV and a power grid according to exemplary embodiments of the present disclosure.

[0035] Figure 5 This is a flowchart illustrating an early renegotiation method according to another exemplary embodiment of this disclosure.

[0036] Figure 6 This is a flowchart illustrating an early renegotiation method according to another exemplary embodiment of this disclosure.

[0037] Figure 7 This is a block diagram of the main components of an apparatus (hereinafter referred to as "early renegotiation apparatus") that performs early renegotiation in a message sequence between an EV and the power grid according to another exemplary embodiment of this disclosure.

[0038] Figure 8 This is a schematic illustration of what can be loaded into Figure 7 A block diagram of the program instructions in the processor of an early renegotiation device, or of the software modules corresponding to those program instructions in the form of units. Detailed Implementation

[0039] Because this disclosure can be modified in various ways and has multiple forms, specific exemplary embodiments will be shown in the accompanying drawings and described in detail in the specific embodiments. However, it should be understood that this disclosure is not intended to limit this disclosure to the specific exemplary embodiments; on the contrary, this disclosure will cover all modifications and alternatives that fall within the spirit and scope of this disclosure.

[0040] Relational terms such as "first" and "second" may be used to describe various elements, but these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this disclosure, a first component may be named a second component, and a second component may similarly be named a first component. The term "and / or" refers to any one of the related and described items or a combination of multiple related and described items.

[0041] When it is said that a component is "connected" or "connected" to another component, it should be understood that the component is directly "connected" or "connected" to the other component, or that other components may be placed between them. Conversely, when it is said that a component is "directly connected" or "directly linked" to another component, it can be understood that no other components are placed between them.

[0042] The terminology used in this disclosure is for the purpose of describing particular exemplary embodiments only and is not intended to limit the disclosure. Singular expressions include plural expressions unless the context clearly specifies otherwise. In this disclosure, terms such as “comprising” or “having” are intended to describe the presence of features, quantities, steps, operations, components, parts, or combinations thereof described in the specification, but it should be understood that these terms do not preclude the presence or addition of one or more features, quantities, steps, operations, components, parts, or combinations thereof.

[0043] Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Commonly used terms and terms appearing in dictionaries shall be interpreted as having the meaning appropriate to the context in this art. In this specification, terms are not necessarily construed as having a formal meaning unless explicitly defined.

[0044] The terms used in this specification are defined as follows.

[0045] "Electric vehicle (EV)" can refer to a vehicle powered by electricity supplied by onboard energy storage devices such as batteries that can be charged from an external power source. The power source can include residential, public power services, or generators using onboard fuel. EVs can be referred to as electric vehicles, electric road vehicles (ERVs), plug-in vehicles (PVs), plug-in all-electric vehicles (xEVs), etc., and xEVs can 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.

[0046] "Plug-in electric vehicles (PEVs)" can refer to electric vehicles that are charged by connecting to the power grid.

[0047] "Wireless charging system (WCS)" can refer to a system that enables wireless power transfer, alignment, and communication between the ground component (GA) and the vehicle component (VA).

[0048] "Wireless power transfer (WPT)" can refer to technologies that transmit or receive power from electric vehicles through non-contact methods such as electromagnetic induction and resonance, such as power sources such as utilities, power grids, energy storage devices, and fuel cell generators.

[0049] "Utility": A system that supplies electricity and may include a Customer Information System (CIS), Advanced Metering Infrastructure (AMI), rate and revenue systems, etc. Utilities can supply energy to EVs based on rate tables and discrete events. Furthermore, utilities can provide information on electric vehicle certification, time intervals for electricity consumption measurements, and electricity pricing.

[0050] "Smart charging": A system in which EVSE and / or PEV communicate with the power grid to optimize the charging or discharging rate of electric vehicles by reflecting the capacity of the grid or the cost of use.

[0051] "Interoperability": The state in which components of a system cooperate with each other to perform the operations that the system is designed to perform. Furthermore, information interoperability can refer to the ability of two or more networks, systems, devices, applications, or components to effectively share and easily use information without causing inconvenience to users.

[0052] "Inductive charging system": A system that transfers energy from a power source to an electric vehicle via a two-part gap-core transformer, wherein the two halves of the transformer, namely the primary coil and the secondary coil, are physically separated from each other. In this disclosure, the inductive charging system may correspond to an EV power transmission system.

[0053] "Inductive connection": A magnetic connection between two coils. In this disclosure, it refers to the connection between the GA coil and the VA coil.

[0054] "Original Equipment Manufacturer (OEM)": EV manufacturer or server operated by EV manufacturer. It may include root certification authorities (CAs) or root certification servers that issue OEM root certificates.

[0055] "V2G Operator": A major participant in V2G communication using the transmission protocol, or an entity that initiates a blockchain to automatically authenticate EVs or EV users and create smart contracts on the blockchain. It may include at least one trusted authentication authority or trusted authentication server.

[0056] "Charging service operator (or mobile operator (MO))": One of the entities within the PnC architecture that has a contractual relationship with electric vehicle owners regarding charging, approval, and payment, enabling electric vehicle drivers to charge their EV batteries at charging stations. It may include at least one certification body or certification server that issues and manages its own certificates. A charging service operator may be referred to as an electric vehicle operator.

[0057] "Charging Service Provider (CSP)": An entity responsible for managing and verifying the credentials of electric vehicle users and acting as the provider of billing and other value-added services to customers. It can correspond to a special type of MO (Motor Vehicle) and can be implemented in combination with MOs.

[0058] “Charging station (CS)”: A facility or equipment that has one or more EV power supply devices and actually performs EV charging.

[0059] "Charging Station Operator (CSO)": An entity that connects to the power grid and manages electricity to provide the power required by EVs. It can be the same term as the concept of a Charging Point Operator (CPO) or Electric Vehicle Service Provider (eMSP), and it can also be a term included within or encompassing the concepts of a CPO or eMSP. A CSO, CPO, or Emsp can include at least one certification body that issues or manages its own certificates.

[0060] "Electric Vehicle Authentication Identifier (eMAID)": A unique identifier that links the contract certificate to the payment account of the owner of the electric vehicle using electricity. In an exemplary embodiment, the electric vehicle authentication identifier may include an identifier for the EV certificate or an identifier for the supply certificate. The term eMAID may be replaced by "Electric Vehicle Account Identifier" or "Contract ID".

[0061] "Information Exchange Center (CH)": An entity that handles cooperation matters between MOs, CSPs, and CSOs. It can act as an intermediary, facilitating the approval, billing, and adjustment procedures for EV charging service roaming between the parties.

[0062] "Roaming": Information exchange, schemes, and regulations between CSPs that allow EV users to access charging services offered by multiple CSPs or CSOs associated with multiple electric vehicle networks using a single credential and contract.

[0063] "Credentials": Physical or digital assets that represent the identity of an EV or its owner, and may include a password used to verify identity, a public and private key pair used in a public-key cryptographic algorithm, a public key certificate issued by a certification authority, and information related to a trusted root certification authority.

[0064] "Certificate": An electronic document that binds a public key to an ID card through a digital signature.

[0065] "Service Session": A collection of services surrounding a charging point that are associated with EV charging allocated to a specific customer within a specific time period and have a unique identifier.

[0066] In the following sections, exemplary embodiments of the present disclosure will be explained in detail with reference to the accompanying drawings.

[0067] An exemplary embodiment of the present disclosure of a method for early renegotiation in a message sequence between an EV and the power grid (hereinafter referred to as the "early renegotiation method") may include a process by which a charging station's SECC or a secondary participant connected to the SECC rapidly changes the service process through service renegotiation while performing message exchange or charging procedures between the EV and the charging station.

[0068] Figure 1 This is a conceptual diagram illustrating an EV wireless power transmission structure to which an early renegotiation method, according to exemplary embodiments of the present disclosure, can be applied.

[0069] like Figure 1 As shown, wireless power transfer (WPT) of an electric vehicle (hereinafter referred to as "EV") 10 can be defined as the process of transferring electrical energy from a supplier-side device to a consumer-side device via a magnetic field in a state of magnetic induction or magnetic resonance without the current flowing through the electrical connection device. Wireless power transfer can be used to charge the battery 150 of the EV 10 by transferring power from a charging station (GA1) to the EV 10.

[0070] EV 10 may include a receiving pad 130 with a receiving coil for wirelessly receiving electromagnetic energy from a transmitting pad GAP1 of charging station GA1. The receiving coil of receiving pad 130 receives magnetic energy from the transmitting coil of transmitting pad GAP1 of charging station GA1 via electromagnetic induction or magnetic resonance. The magnetic energy received by EV 10 is converted into an induced current, and the induced current is rectified into DC current, which is then used to charge battery 150.

[0071] Charging station GA1 can receive power from the commercial power grid G1 or the main power grid and supply energy to EV10 via the delivery pad GAP1. The EV power supply equipment (EVSE) corresponding to charging station GA1 can be located in various locations, such as the garage or parking lot of a home belonging to the EV10 owner, the parking area for EV charging at a gas station, or the parking area of ​​a shopping mall or office building.

[0072] Charging station GA1 can communicate with the power infrastructure management system or infrastructure server that manages the power grid G1 via wired / wireless communication. Furthermore, charging station GA1 can perform wireless communication with EV 10.

[0073] Wireless communication may include Wi-Fi-based wireless LAN (WLAN) communication according to the IEEE 802.11 protocol, and may also include P2PS communication using low-frequency (LF) magnetic field signals and / or low-power excitation (LPE) signals. Wireless communication between the charging station GA1 and EV 10 may include one or more of various communication schemes such as Bluetooth, Zigbee, and cellular.

[0074] Furthermore, the EV 10 and charging station GA1 can perform the charging process by exchanging messages according to Extensible Markup Language (XML) or based on the Effective XML Exchange (EXI) data expression format. In other words, communication during the charging process can be performed between the EVCC and the Power Supply Communication Controller (SECC) via wireless LAN or similar means.

[0075] During the charging process, the EV can first verify the charging station's identity to determine if it is a trusted facility, and then establish a secure channel with the charging station to protect communication from unauthorized access. This secure channel can be established using Transport Layer Security (TLS). Following the Internet Protocol (IP)-based communication connection establishment procedure, the TLS session can be executed according to the TLS session establishment procedure.

[0076] Figure 2 This is a conceptual diagram illustrating an EV wired charging structure to which an early renegotiation method, according to exemplary embodiments of the present disclosure, can be applied.

[0077] like Figure 2 As shown, EV wired charging can be performed by connecting EV 10 to the power circuit of the charging station via charging cable 30.

[0078] The EV 10 may have a vehicle socket for connecting to a vehicle connector 30. The vehicle socket provided in the EV 10 may support slow charging, fast charging, or both slow and fast charging.

[0079] In addition, the EV 10 may include an onboard charger to support slow charging or charging via AC power supplied from the universal power system. During slow charging, the onboard charger boosts the AC power supplied externally via wires, converts it to DC power, and supplies it to the battery built into the EV 10. On the other hand, when DC power for fast charging is supplied to the vehicle's charging port, DC power can be supplied and charged to the battery without going through the onboard charger.

[0080] The charging station may include a power supply circuit (not shown) that supplies power to the EV 10 and a communication controller that communicates with the EV 10.

[0081] On the other hand, the charging cable 30 may include a vehicle connector 31 and a plug 33, and may be used to enable entities of the EV and the power grid to communicate with each other using a power line communication (PLC) scheme.

[0082] The vehicle connector 31 is a connector capable of electrically connecting to the EV 10, and the plug 33 can be connected to the socket 40 of the charging equipment or the power supply equipment of the charging station. The socket 40 refers to the connection point between the charging equipment of the charging station and the plug 33 or vehicle socket, but this disclosure is not limited thereto, and the socket 40 can refer to the connection point between the plug or charging cable 30 and the charging equipment installed in various locations. For example, the socket 40 can refer to a wall socket installed in a charging facility, such as a garage or parking lot belonging to the home of the EV 10 owner, a parking area allocated for EV charging at a gas station, a parking area in a shopping mall or workplace, or a commercial charging station facility.

[0083] Furthermore, the charging cable 30 can be configured to further include an in-cable control box (ICCB) 32. The in-cable control box 32 can communicate with the EV 10 to receive EV status information or control the charging process of the EV 10.

[0084] ICCB 32 may correspond to the Power Supply Communication Controller (SECC) described later. EV 10 and ICCB 32 can be interconnected via power line communication, and ICCB 32 and secondary participants can be interconnected via at least one of wired and wireless communication networks.

[0085] In the following description, a sequence refers to the sequence of sending / receiving or processing service calls or messages between the Electric Vehicle Communication Controller (EVCC) and the Power Supply Equipment Communication Controller (SECC). This sequence may be specified by national or international standards, industry standards, etc. Therefore, failure to consider predetermined sequences may result in inappropriate processing outcomes, or in the worst case, damage to related data or related components or equipment. Furthermore, a sequence or message sequence refers to controlling the flow of messages by initiating them one by one or step by step, and this operation can be guaranteed by the EVCC and / or SECC.

[0086] Figure 3 This is a block diagram illustrating the message sequence of the vehicle-to-grid (V2G) communication status in a comparative example.

[0087] like Figure 3As shown, the V2G communication states in the comparative examples may include Supported App Protocol (SAP), Session Setup (SSU) state, Vehicle Positioning Setup (VPS) state, Vehicle Positioning (VPOS) state, Pairing state, Authorization Setup (ASUP) state, Certificate Installation (CINS) state, Authorization (AUTH) state, Service Discovery (SDI) state, Service Details (SDE) state, Service Selection (SSEL) state, and Charge Parameter Discovery (ChargeParameter Discovery). The statuses of the following devices are listed: meter discovery (CPD), device positioning (DPOS), device connection (DCON), cable check (CC), precharge (PC), power delivery (PD), AC charging loop (AC_ChargeLoop (ACCL), DC charging loop (DC_ChargeLoop (DCCL), wireless power transmission charging loop (WPT_ChargeLoop (WPTCL)), device disconnection (DDIS), welding detection (WDET), and session stop (SSP).

[0088] At least some communication states can be processed or transitioned between based on power line communication (PLC), wireless local area network (WLAN), and / or the like. Furthermore, at least some communication states can be processed or transitioned between based on processes for AC charging schemes or DC charging schemes. Additionally, at least some communication states can be processed or transitioned between schemes utilizing wireless power transmission (WPT) or automatic connection device (ACD).

[0089] Figure 4 This is a flowchart describing an early renegotiation method (hereinafter referred to as the "early renegotiation method") in a message sequence between an EV and a power grid according to exemplary embodiments of the present disclosure.

[0090] like Figure 4As shown, when executing message sequences based on PLC or WLAN in each communication state such as Session Setup (SSU), Vehicle Positioning Setup (VPS), Vehicle Positioning (VPOS), Pairing, Authorization Setup (ASUP), Authorization (AUTH), Service Discovery (SDI), Service Detail (SDE), Power Delivery (PD), and Session Stop (SSP), an early renegotiation method can be applied.

[0091] More specifically, the early renegotiation method performed by the EV in the message sequence between the EV and the grid can be performed in the following state: before the EV or the EVCC installed on the EV establishes a Transport Layer Security (TLS) connection after receiving a service details response message from the SECC.

[0092] After the TLS connection is established, EVCC can send an SAP request message to SECC with SAP application protocol (SAP) configured. Upon receiving an SAP response message in response to the SAP request message, EVCC can send a session establishment request message to SECC within a preset sequence performance timeout period.

[0093] Based on the selection or decision in the Session Establishment (SSU) state, EVCC can process or switch communication states based on PLC or WLAN.

[0094] Next, EVCC can receive the Service Detail Response (ServiceDetailRes) message corresponding to the Service Detail Request (ServiceDetailReq) message from SECC in the Service Detail (SDE) state configured for service details. Of course, before receiving the Service Detail Response message, SECC can send / receive messages for Service Discovery Initiation (SDI) via SECC.

[0095] Next, EVCC can search for pre-stored or pre-configured compatible parameters for DC charging or AC charging based on the service details response message.

[0096] Next, if no compatible parameters are found, the EVCC can change its state from Service Details (SDE) state to Vehicle Positioning Establishment (VPS) state for vehicle positioning or pairing using ACD or wireless power transmission (S10).

[0097] A change of state can refer to a change in the current state or the current communication state, and can include a transition, movement, or jump from a first state to a second state.

[0098] This state change can be performed when a SessionStopCres message with a response code of "OK" is received while the charging progress parameter of the previous SessionStopReq message is set to "Renegotiation" or "ServiceRenegotiation".

[0099] Then, the EVCC can send a VehiclePositioningSetupReq message to the SECC while the Vehicle Positioning Setup (VPS) is active. Sending the VPS message to the SECC can be performed within a preset first-sequence performance timeout period. The first-sequence performance timeout period can be 2 seconds or more and 40 seconds or less in duration.

[0100] On the other hand, the aforementioned EVCC Service Discovery (SDI) state can be moved to the Session Setup (SSP) state, and can be in a state that has been moved from the Power Delivery (PD) state through service renegotiation.

[0101] Figure 5 This is a flowchart illustrating an early renegotiation method according to another exemplary embodiment of this disclosure.

[0102] like Figure 5 As shown, when executing message sequences based on PLC or WLAN in communication states such as Session Establishment (SSU), Vehicle Location Establishment (VPS), Vehicle Location (VPOS), Pairing, Authorization Establishment (ASUP), Authorization (AUTH), Service Discovery (SDI), Service Details (SDE), Power Delivery (PD), and Session Stop (SSP), the above-mentioned references can be applied. Figure 4 The described early renegotiation method is similar to the early renegotiation method.

[0103] More specifically, the early renegotiation method can be performed in the following state: A TLS connection is established before the EV or the EVCC installed on the EV receives the Vehicle Positioning Establishment Response message from the SECC. In this case, after the TLS connection is established, the EVCC can send an SAP Request message to the SECC with the Support Application Protocol (SAP) configured. After receiving the SAP Response message corresponding to the SAP Request message, the EVCC can send a Session Setup Request message to the SECC within a preset sequence performance timeout period. Depending on the selection or decision in the Session Setup (SSU) state, the EVCC can handle or switch the communication state based on PLC or WLAN.

[0104] Next, the EVCC can receive the VPS response message corresponding to the Vehicle Position Establishment (VPS) request message from the SECC via WLAN.

[0105] Next, based on the information included in the VPS response message, EVCC can search for compatible methods for positioning or pairing for ACD or wireless power transfer.

[0106] Next, if no compatible method is found or no compatible method is found, the EVCC can transition from the Vehicle Positioning Setup (VPS) state to the Authorization Setup (ASUP) state to perform DC charging or AC charging (S20). The transition to the Authorization Setup (ASUP) state can be executed when a Session Setup Request message with a response code set to "OK" is received while the charging progress parameter of the previous SessionStopReq message is set to "Renegotiation" or "ServiceRenegotiation".

[0107] Then, EVCC can send an AuthorizationSetupReq message to SECC in the Authorization Setup (ASUP) state. Sending the AuthorizationSetupReq message to SECC can be executed within a preset second-sequence performance timeout period. The preset second-sequence performance timeout period can be several seconds to tens of seconds in length.

[0108] On the other hand, in the early renegotiation method, EVCC can send an authorization establishment request message to SECC, and then send a service discovery request message to SECC. EVCC can move from the service discovery (SDI) state to the session setup (SSP) state through service renegotiation, and can also move from the power delivery (PD) state to the service discovery (SDI) state.

[0109] Figure 6 This is a flowchart illustrating an early renegotiation method according to another exemplary embodiment of this disclosure.

[0110] like Figure 6 As shown, after the EVCC installed on the EV receives the SAP response message in response to the SAP request message from the SECC in the SAP configured state, the EVCC can send the Session Setup Req message to the SECC in the Session Setup (SSU) state within a preset sequence performance timeout period.

[0111] When the EVCC uses the PLC, after receiving the Session Setup Response (SessionSetupRes) message corresponding to the Session Setup Request (SessionSetupReq) message, the EVCC can move or switch to the Authorization Setup (ASUP) state 60, and then send the Authorization Setup Request (AuthorizationSetupRek) message to the SECC within a preset timeout period.

[0112] In addition, after receiving an AuthorizationSetupRes message with the ResponseCode set to "OK" and the CertificateInstallationService parameter set to "True", EVCC can send a CertificateInstallationReq message to SECC within a preset timeout period in the CertificateInstallation state to install or update the contract certificate.

[0113] When EVCC receives an AuthorizationSetupRes message with the response code set to "OK" and the parameter Certificate Installation Service set to "False", EVCC can send the AuthorizationSetupRes to SECC within a preset timeout period while in the Authorized (AUTH) state.

[0114] On the other hand, when the EVCC uses WLAN, after receiving the session establishment response message, the EVCC can move or switch to the Vehicle Positioning Setup (VPS) state 30, and then send the Vehicle Positioning Setup Request (VPS) message to the SECC.

[0115] Furthermore, upon receiving the Vehicle Positioning Setup Res message, the EVCC can perform actions for early renegotiation, as described above, based on the parameter configuration in the Vehicle Positioning Setup Res message. Figure 5 The described message sequence is similar to a second sequence.

[0116] The second sequence may include: searching for a compatible method for positioning or pairing for ACD or wireless power transmission based on the information included in the Vehicle Positioning Setup (VPS) response message; transitioning from the VPS state to the Authorization Setup (ASUP) state to perform DC charging or AC charging (S20); and sending an Authorization Setup Request (AuthorizationSetupReq) message to the SECC within a preset timeout period in the Authorization Setup (ASUP) state.

[0117] Of course, after receiving the vehicle location establishment response message, according to another parameter configuration in the vehicle location establishment response message, after sequentially transitioning from the vehicle location establishment (VPS) state 30 to the vehicle location state and the pairing state, the EVCC can move or transition to the authorized establishment (ASUP) state 60.

[0118] Furthermore, after authorization is complete, EVCC can transition from the Authorization (AUTH) state to the Service Discovery (SDI) state 80, and then to the Service Detail (SDE) state 90. Here, the SDI state 80 can transition to the Session Stop (SSP) state or from the Power Delivery (PD) state through service renegotiation.

[0119] In other words, after receiving an AuthorizationRes message with a specific parameter (EVSEProcessing) set to "Finished" and a response code set to "OK", EVCC can send a ServiceDiscoveryReq message within a preset timeout period. Messages sent to SECC can be delivered to the target secondary participant via or through SECC.

[0120] After receiving a Service Discovery Res message with the response code set to "OK", EVCC can send a Service Detail Req message to SECC within a preset timeout period.

[0121] After receiving a ServiceDetailRes message with the response code set to "OK", if an additional ServiceDetailRequest message is needed to retrieve details from the SECC, the EVCC can send another ServiceDetailRequest message to the SECC within a preset timeout period.

[0122] Furthermore, after receiving a ServiceDetailRes message in ServiceDetail (SDE) state 90, EVCC can perform early renegotiation based on the configuration of specific parameters in the ServiceDetailRes message. Figure 4 The first sequence describes some message sequences similar to those in the first sequence.

[0123] The first sequence may include: searching for pre-stored or pre-configured compatible parameters for DC charging or AC charging based on the service details response message; if no compatible parameters are found, jumping or transitioning from the SDE state to the Vehicle Positioning Setup (VPS) state for vehicle positioning or pairing using ACD or wireless power transmission (S10); and sending a Vehicle Positioning Setup Request (VPS) message to the SECC in the VPS state.

[0124] On the other hand, EVCC can be configured to remember the Selected Authorization Service (SAS) that has been used during the current service session, or to remember the SAD and Contract Certificate Chain, so as not to get stuck in a continuous loop.

[0125] In addition, other communication states, such as Service Selection (SSEL), Charge Parameter Discovery (CPD), Device Positioning (DPOS), Device Connection (DCON), Cable Check (CC), Pre-charge (PC), Power Delivery (PD), AC Charging Loop (AC_ChargeLoop (ACCL), DC Charging Loop (DC_ChargeLoop (DCCL), Wireless Power Transmission Charging Loop (WPT_ChargeLoop (WPTCL), Device Disconnection (DDIS), Welding Detection (WDET), and Session Stop (SSP), can be processed or converted based on PLC, WLAN, etc. Furthermore, at least some communication states can be processed or converted between these communication states according to the procedures used for AC charging schemes or DC charging schemes. Furthermore, at least some communication states can be processed or transitioned between schemes utilizing WPT or ACD. Since the processing or transition of these communication states is well-known, a detailed description of such processing or transition will be omitted.

[0126] Figure 7 This is a block diagram of the main components of an apparatus (hereinafter referred to as "early renegotiation apparatus") that performs early renegotiation in a message sequence between an EV and the power grid according to another exemplary embodiment of this disclosure. Figure 8 This is a schematic illustration of what can be loaded into Figure 7 A block diagram of the program instructions in the processor of an early renegotiation device, or of the software modules corresponding to those program instructions in the form of units.

[0127] like Figure 7 As shown, the early renegotiation device can be installed on or connected to the EV or EVCC, and in another embodiment, the early renegotiation device can be installed on or connected to the electric vehicle power supply equipment (EVSE) or SECC.

[0128] Furthermore, according to the implementation, the early renegotiation device may include a processor 220 and a memory 210, and may further include a storage device 230 and a communication interface 240.

[0129] Memory 210 may store program instructions or software modules. Processor 220 may implement an early renegotiation method by executing program instructions or software modules stored in memory 210.

[0130] Furthermore, at least some components of the early renegotiation device, including processor 220 and memory 210, can be interconnected via a bus to exchange signals and data. Memory 210, processor 220 coupled to memory 210, and program instructions executed by processor 220 can implement EVCC or SECC of EVSE.

[0131] Memory 210 may include, for example, volatile memory such as random access memory (RAM) and non-volatile memory such as read-only memory (ROM). Memory 210 may load program instructions stored in storage device 230 and provide the program instructions to processor 220 so that processor 220 can execute the program instructions.

[0132] Processor 220 can execute program instructions stored in memory 210 and / or storage device 230. Processor 220 may include at least one of a central processing unit (CPU), a graphics processing unit (GPU), or other processors capable of executing the early renegotiation method according to this disclosure.

[0133] Storage device 230 may be a recording medium suitable for storing program instructions and data, such as magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as optical disc read-only memory (CD-ROM) and digital multifunction disc (DVD), magneto-optical media such as floppy disks, or semiconductor memory such as flash memory, erasable programmable ROM (EPROM) or solid-state drives (SSDs) based thereon.

[0134] When the processor 220 executes the program instructions, it may perform the following operations: receive a service details response message from the power supply communication controller (SECC); search for compatible parameters for DC charging or AC charging based on the service details response message; in response to not finding compatible parameters, jump from the service details state to a vehicle positioning establishment state for vehicle positioning using an automatic connection device or wireless power transmission; send a vehicle positioning establishment request message to the SECC in the vehicle positioning establishment state; receive a vehicle positioning establishment response message from the SECC; search for a compatible method for positioning or pairing for an automatic connection device or wireless power transmission; in response to a compatible method being unavailable, change the state from the vehicle positioning establishment state to an authorized establishment state for DC charging or AC charging; and send an authorized establishment request message to the SECC in the authorized establishment state.

[0135] When the above program instructions are executed by processor 220, such as Figure 8 As shown, these can be loaded into processor 220 in the form of software modules or software units. Software modules can be configured to include a message receiving unit 221, a parameter search unit 222, a state transition unit 223, a compatible method search unit 224, a message sending unit 225, and a transmission timing control unit 226.

[0136] The message receiving unit 221 can perform the steps of receiving a service details response message from the SECC or receiving a vehicle location establishment response message from the SECC. The parameter search unit 222 can perform the steps of searching for compatible parameters for DC charging or AC charging based on the service details response message.

[0137] If no compatible parameters are found, the state transition unit 223 can perform a step to transition from the service details state to the vehicle location establishment state in order to perform vehicle location using ACD or WPT. If no compatible method exists, the compatibility method search unit 224 can perform a step to change the state from the vehicle location establishment state to the authorized establishment state in order to perform DC charging or AC charging. At least one of the state transition unit 223 and the compatibility method search unit 224 can receive record information or configuration information of the corresponding configuration or parameters so that it can be run when a session stop response message with a response code set to "OK" is received in the state where the charging progress parameter of the final session stop request message of the previous sequence is set to "Service Renegotiation".

[0138] The message sending unit 225 can perform the step of sending a vehicle location establishment request message to the SECC in the vehicle location establishment state, or the step of sending an authorization establishment request message to the SECC in the authorization establishment state. Furthermore, the transmission timing control unit 226 can provide the message sending unit 225 with timing for sending a session establishment request message to the SECC within a preset sequence performance timeout period after receiving an SAP response message corresponding to the SAP request message, timing for sending a vehicle location establishment request message to the SECC within a preset sequence performance timeout period, and timing for sending an authorization establishment request message to the SECC within a preset sequence performance timeout period.

[0139] Refer again Figure 7 The communication interface 240 may include multiple communication subsystems such as a WLAN interface, a PLC module, a peer-to-peer (P2PS) controller, a gateway (G / W) or a combination thereof, and may be used to enable the early renegotiation device to send / receive signals and data or communicate with at least one external device.

[0140] On the other hand, as described above, the apparatus and method according to this disclosure can be implemented as a computer-readable program or code on a computer-readable recording medium. The computer-readable recording medium can include all types of storage devices storing data that can be read by a computer system. Furthermore, the computer-readable recording medium can be distributed across computer systems connected via a network to store and run the computer-readable program or code in a distributed manner.

[0141] Computer-readable recording media may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory. Program instructions may include high-level language code that can be run by a computer using an interpreter, as well as machine code generated by a compiler.

[0142] Some aspects of this disclosure have already been described in the foregoing context concerning devices, but may also be described using corresponding methods. Here, a block or device corresponds to an operation of the method or a feature of the operation of the method. Similarly, aspects of this disclosure described in the foregoing context concerning devices may be described using corresponding blocks or items or features of corresponding devices. Some or all of the operations of the method may be performed, for example, by (or utilizing) hardware devices such as microprocessors, programmable computers, or electronic circuits. In some embodiments, at least one of the most important operations of the method may be performed by such a device.

[0143] In embodiments, programmable logic devices (e.g., field-programmable gate arrays) may be used to perform some or all of the functions of the methods described herein. In embodiments, the field-programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described herein. Typically, these methods are preferably performed by specific hardware devices.

[0144] Although the present disclosure has been described above with reference to embodiments thereof, those skilled in the art should understand that various changes and modifications may be made without departing from the technical concept and scope of the present disclosure as defined in the claims.

Claims

1. An early renegotiation method performed by an electric vehicle in a message sequence between the electric vehicle and the power grid, the early renegotiation method comprising: Receive service detail response messages from the power supply equipment communication controller, i.e., the SECC; Based on the service details response message, search for compatible parameters for DC charging or AC charging; In response to the failure to find the aforementioned compatible parameter, the state is changed from the service details state to the vehicle location establishment state for locating the vehicle using automatic connection devices or wireless power transmission; and In the vehicle location establishment state, a vehicle location establishment request message is sent to the SECC.

2. The early renegotiation method according to claim 1, wherein, The state change is performed when a session stop response message with a response code of "OK" is received while the charging progress parameter of the previous final session stop request message is set to "Renegotiation" or "ServiceRenegotiation".

3. The early renegotiation method according to claim 1, wherein, The vehicle location establishment request message is sent to the SECC within the preset sequence performance timeout period.

4. The early renegotiation method according to claim 1, further comprising: Before receiving the service details response message, messages for service discovery are sent and received, the service discovery being performed through the SECC.

5. The early renegotiation method according to claim 1, further comprising: Before receiving the service details response message, a transport layer secure connection, i.e., a TLS connection, is established.

6. The early renegotiation method according to claim 5, further comprising: After the TLS connection is completed, an SAP request message will be sent to the SECC.

7. The early renegotiation method according to claim 6, further comprising: After receiving the SAP response message in response to the SAP request message, a session establishment request message is sent to the SECC within a preset sequence performance timeout period.

8. An early renegotiation method performed by an electric vehicle in a message sequence between the electric vehicle and the power grid, the early renegotiation method comprising: Receive vehicle location establishment response message from the power supply equipment communication controller, i.e., SECC; Search for compatible methods for locating or pairing automated connection devices or wireless power transmissions; In response to the unavailability of the compatibility method, the system transitions from the vehicle location establishment state to the authorization establishment state in order to perform DC charging or AC charging. and In the authorization establishment state, an authorization establishment request message is sent to the SECC.

9. The early renegotiation method according to claim 8, wherein, The jump is performed when a session stop response message with a response code of "OK" is received in the state where the charging progress parameter of the final session stop request message in the previous sequence is set to "Renegotiation" or "ServiceRenegotiation".

10. The early renegotiation method according to claim 8, wherein, The authorization establishment request message is sent to the SECC within the preset sequence performance timeout period.

11. The early renegotiation method according to claim 8, further comprising: After the authorization establishment request message is sent to the SECC, a service discovery request message is sent to the SECC.

12. The early renegotiation method according to claim 8, further comprising: Before receiving the vehicle location establishment response message, a transport layer secure connection, i.e., a TLS connection, is established.

13. The early renegotiation method according to claim 12, further comprising: After the TLS connection is completed, an SAP request message will be sent to the SECC.

14. The early renegotiation method according to claim 13, further comprising: Upon receiving the SAP response message in response to the SAP request message, a session establishment request message is sent to the SECC within a preset sequence performance timeout period.

15. An apparatus for performing early renegotiation in a message sequence between an electric vehicle and a power grid, the apparatus comprising: Memory, which stores program instructions; as well as The processor is connected to the memory and executes program instructions stored in the memory. When executed by the processor, the program instructions cause the processor to perform the following operations: Receive service detail response messages from the power supply equipment communication controller, i.e., the SECC; Based on the service details response message, search for compatible parameters for DC charging or AC charging; In response to the failure to find the said compatible parameter, the system jumps from the service details state to the vehicle location establishment state, which uses automatic connection devices or wireless power transmission to locate the vehicle. In the vehicle location establishment state, a vehicle location establishment request message is sent to the SECC; Receive vehicle location establishment response message from the SECC; Search for compatible methods for positioning or pairing of the automatic connection device or the wireless power transmission; In response to the unavailability of the compatibility method, the state is changed from the vehicle positioning establishment state to the authorized establishment state to perform DC charging or AC charging; and In the authorization establishment state, an authorization establishment request message is sent to the SECC.

16. The apparatus according to claim 15, wherein, The program instructions further cause the processor to perform the following operations: when a session stop response message with a response code set to "OK" is received while the charging progress parameter of the previous sequence's final session stop request message is set to "ServiceRenegotiation", the processor performs the state change or the jump.

17. The apparatus according to claim 15, wherein, The program instructions further cause the processor to perform the following operations: send the vehicle location establishment request message to the SECC within a preset sequence performance timeout period.

18. The apparatus according to claim 15, wherein, The program instructions further cause the processor to perform the following operations: send the authorization establishment request message to the SECC within a preset sequence performance timeout period.

19. The apparatus according to claim 15, wherein, The program instructions further cause the processor to perform the following operations: after sending the authorization establishment request message to the SECC in the authorization establishment state, send a service discovery request message to the SECC.

20. The apparatus according to claim 15, wherein, The program instructions further cause the processor to perform the following operations: before receiving the service details response message, send and receive messages for service discovery, the service discovery being performed via the SECC.

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