Method for obtaining EVCC id and SOC of electric vehicle in ac electric vehicle charger and system supporting same

Abstract

The present specification relates to a method for obtaining, by an AC charger, an EVCC ID corresponding to the unique value of an electric vehicle and SOC information of the electric vehicle from the electric vehicle in an electric vehicle charging system, the method comprising the steps of: identifying an HLC connection between the AC charger having a PLC module and the electric vehicle; obtaining, by the AC charger, the EVCC ID and the SOC information of the electric vehicle from the electric vehicle through the HLC connection; storing the obtained EVCC ID and the obtained SOC information of the electric vehicle; determining whether to maintain the HLC connection according to the type of a message receiving the SOC information of the electric vehicle; and performing, by the AC charger, charging by transmitting AC power to the electric vehicle.

Description

A method for obtaining the EVCC ID and SOC of an electric vehicle from an AC electric vehicle charger and a system supporting the same.

[0001] This specification relates to an electric vehicle charging system, and more specifically, to a method for obtaining an EVCC ID (Electric Vehicle Communication Controller Identification) and SoC (State of Charge) of an electric vehicle in an AC electric vehicle charger, and a system supporting the same.

[0002] Currently, electric vehicle chargers (hereinafter referred to as "AC chargers") that charge electric vehicles with AC power primarily communicate using Pulse Width Modulation (PWM) via the CP (Control Pilot) of the Charge Plug connected to the electric vehicle. This method does not allow the AC charger to access the electric vehicle's SoC information and EVCC ID. In other words, communication using only PWM prevents the AC charger from accessing the electric vehicle's SoC information and EVCC ID.

[0003] An electric vehicle's SoC information allows the charger to recognize the battery charge level and control charging based on this information. Furthermore, the EVCC ID, unique to the electric vehicle, is crucial information that can be linked to a payment system that charges based on charging rights and charging capacity.

[0004] In AC charging mode, electric vehicles have limited access to the battery's State of Charge (SoC) information and the EVCC ID (EVCC), their unique identification number. Therefore, existing AC chargers that don't support HLC have no way to obtain the SoC and EVCCID. Currently, electric vehicles only provide these information in DC charging mode.

[0005] Therefore, it is necessary to study a method to obtain information on the SoC information and the EVCCID, which is a unique number of an electric vehicle, even from an AC charger where access to the SoC information and EVCCID is restricted.

[0006] The purpose of this specification is to provide a method for a SECC (Supply Equipment Communication Controller) of an AC charger that charges an electric vehicle with AC power to obtain SoC information and EVCC ID of an electric vehicle through an EVCC and HLC of the electric vehicle in an electric vehicle charging system that supports the protocol of ISO 15118-2(20) or DIN SPEC 70121, and a method for charging an electric vehicle with AC power using the obtained SoC information.

[0007] In addition, the present specification aims to provide a method for predicting the amount of power supplied to an electric vehicle by an AC charger using SoC information of the electric vehicle, and adjusting the amount of power supplied to the electric vehicle by comparing the predicted amount of power with the amount of power of the electric vehicle actually being charged.

[0008] The present specification provides a method for an AC charger in an electric vehicle charging system to obtain an EVCC (Electric Vehicle Communication Controller) ID (Identification) corresponding to a unique value of the electric vehicle and SoC (State of Charge) information of the electric vehicle from an electric vehicle, the method comprising: a step of confirming an HLC (High Level Communication) connection between the AC charger having a PLC (Power Line Communication) module and the electric vehicle; a step of the AC charger obtaining the EVCC ID and SoC information of the electric vehicle from the electric vehicle through the HLC connection; a step of storing the obtained EVCC ID and SoC information of the electric vehicle; a step of determining whether to maintain the HLC connection according to a type of a message receiving the SoC information of the electric vehicle; and a step of the AC charger transmitting AC power to the electric vehicle to perform charging.

[0009] In addition, the EVCC ID and SoC information of the electric vehicle obtained in the present specification are characterized in that they are stored in an external device through a communication module implemented in the AC charger or stored inside the AC charger.

[0010] In addition, the external device in this specification is characterized as being a CSMS (Charging Station Management System) or CEMS (Charging Energy Management System).

[0011] In addition, in this specification, the HLC is characterized in that it communicates using a PWM (Pulse Width Modulation) signal and an OFDM signal through a CP (Control Point) Line corresponding to a physical signal line between the AC charger and the electric vehicle using the PLC module.

[0012] Additionally, the step of verifying the HLC connection in the present specification is characterized in that it includes a step of the AC charger transmitting a 9Vdc signal with a 5% duty cycle to the electric vehicle through the CP line.

[0013] In addition, the initial state of the HLC connection in the present specification is characterized in that it is set to DC (Direct Current) message communication in DC charging mode.

[0014] In addition, in the present specification, when the AC charger receives information about the charging mode of the electric vehicle from the electric vehicle, it is characterized in that it maintains the set DC charging mode or changes to the AC charging mode based on the information about the received charging mode.

[0015] Additionally, in the present specification, the charging mode is characterized as being a DC charging mode or an AC charging mode.

[0016] In addition, in this specification, information on the charging mode is characterized in that it is acquired through the ChargeParamterDiscoveryReq message of the ISO 15118 protocol.

[0017] In addition, in this specification, the EVCC ID is characterized in that it is transmitted through the SessionSetupReq message of the ISO 15118 protocol.

[0018] In addition, in the present specification, the SoC information of the electric vehicle is characterized in that it is acquired through the ChargeParameterDiscoveryReq message of the ISO 15118-2 protocol or the AC or DC ChargeParameterDiscoveryReq message of the ISO 15118-20 protocol.

[0019] In addition, in the present specification, when the charging mode of the electric vehicle is a DC charging mode, SoC information of the electric vehicle is obtained through DC_EVChargeParameter of the ChargeParameterDiscoveryReq message of the ISO 15118-2 protocol or through the DC_ChargeParameterDiscovery message of the ISO 15118-20 protocol, and when the charging mode of the electric vehicle is an AC charging mode, SoC information of the electric vehicle is obtained through AC_EVChargeParameter of the ChargeParameterDiscoveryReq message of the ISO 15118-2 protocol or through the AC_ChargeParameterDiscovery message of the ISO 15118-20 protocol.

[0020] In addition, the method in the present specification is characterized by further including the steps of calculating a predicted charging amount of the electric vehicle using the stored EVCC ID and SoC information of the electric vehicle; comparing the calculated predicted charging amount with the actual charging amount currently being charged to the electric vehicle; and determining whether to stop charging the electric vehicle based on the comparison result.

[0021] In addition, the present specification is characterized by including a step of stopping charging of the electric vehicle when the actual charging amount is greater than the predicted charging amount.

[0022] Additionally, in this specification, the type of the message is characterized as being an AC message or a DC message.

[0023] In addition, the step of determining whether to maintain the HLC connection in the present specification is characterized by including the step of maintaining the HLC connection when the AC charger and the electric vehicle communicate in AC charging mode through an AC message of the ISO 15118-2 or ISO 15118-20 protocol; and the step of terminating the HLC connection and performing communication through PWM communication when the AC charger and the electric vehicle communicate in DC charging mode through a DC message of the ISO 15118-2 or ISO 15118-20 protocol.

[0024] In addition, the HLC connection in the present specification is characterized in that it is terminated after obtaining SoC information of the electric vehicle or after the AC charger transmits information about a communication error to the electric vehicle through the HLC connection.

[0025] This specification supports HLC that satisfies the DC message protocol of electric vehicles and ISO 15118-2(20) by connecting a PLC module to an AC charger, thereby enabling the AC charger to obtain SoC information and EVCC ID of an electric vehicle, and predict the amount of power to be charged for the electric vehicle based on the obtained SoC information of the electric vehicle, and efficiently charge the electric vehicle by comparing the predicted amount of power when charging the electric vehicle with the actual amount of power charged for the electric vehicle, and prevent fires caused by overcharging of the electric vehicle, and has the effect of establishing a management system that precisely controls the supply to the power grid.

[0026] In addition, this specification has the effect of enabling an AC charger to identify an electric vehicle by obtaining an EVCC ID, thereby facilitating payment for electric vehicle charging.

[0027] The accompanying drawings, which are incorporated in and constitute a part of the detailed description to aid in the understanding of the present invention, provide embodiments of the present invention and, together with the detailed description, explain the technical features of the present invention.

[0028] Figure 1 is a conceptual diagram showing an example of an electric vehicle charging system to which the method proposed in this specification can be applied.

[0029] Figure 2 is a diagram showing an example of a connection block diagram of an electric vehicle charger and an electric vehicle proposed in this specification.

[0030] Figure 3 shows an example of a V2G message flow diagram of the ISO 15118 standard to which the method proposed in this specification can be applied.

[0031] Figure 4 is a diagram showing an example of a communication block diagram of an electric vehicle and an electric vehicle equipped with a PLC module proposed in this specification.

[0032] Figure 5 is a flowchart showing an example of a method for obtaining EVCCID and SoC information of an electric vehicle proposed in this specification.

[0033] Fig. 6 is a diagram showing an example of CP voltage change when an electric vehicle charger and an electric vehicle proposed in this specification perform PWM communication.

[0034] Fig. 7 is a diagram showing an example of CP voltage change when an electric vehicle charger and an electric vehicle proposed in this specification perform HLC communication.

[0035] Figure 8 is a flowchart showing an example of a method for obtaining EVCCID and SoC information of an electric vehicle proposed in this specification.

[0036] It should be noted that the technical terms used in this specification are merely used to describe specific embodiments and are not intended to limit the scope of the technology disclosed herein. Furthermore, unless specifically defined otherwise herein, the technical terms used herein should be interpreted as having a meaning generally understood by a person of ordinary skill in the art to which the technology disclosed herein pertains, and should not be interpreted in an excessively broad or narrow sense. Furthermore, if a technical term used herein is an incorrect technical term that does not accurately express the scope of the technology disclosed herein, it should be replaced with a technical term that can be correctly understood by a person of ordinary skill in the art to which the technology disclosed herein pertains. Furthermore, general terms used herein should be interpreted according to their dictionary definitions or according to the context, and should not be interpreted in an excessively narrow sense.

[0037] While terms including ordinal numbers, such as "first" and "second," used herein may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component."

[0038] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or similar components are given the same reference numbers and redundant descriptions thereof will be omitted.

[0039] Additionally, when describing the technology disclosed in this specification, detailed descriptions of related known technologies will be omitted if they are deemed to obscure the gist of the technology disclosed in this specification. Furthermore, it should be noted that the attached drawings are intended solely to facilitate understanding of the concepts of the technology disclosed in this specification and should not be construed as limiting the scope of the technology.

[0040]

[0041] Figure 1 is a conceptual diagram showing an example of an electric vehicle charging system to which the method proposed in this specification can be applied.

[0042] Referring to Fig. 1, an electric vehicle charging system (10) is configured to include an electric vehicle charger (100), an electric vehicle (200), and a control system (300).

[0043] The above electric vehicle charging system supports charging of electric vehicles, including an electric vehicle charger, an electric vehicle, and a control system linked to the electric vehicle charger.

[0044] The above control system monitors the status of the electric vehicle and the electric vehicle charger. Specifically, the control system can communicate with the electric vehicle charger via the OCPP protocol.

[0045] The above-described electric vehicle charger includes a Supply Equipment Communication Controller (SECC) module. The SECC is a communication module installed in the electric vehicle charger and can transmit and receive control information and status information about the electric vehicle charger based on Open Charge Point Protocol (OCPP) communication with the control system. The electric vehicle charger referred to herein may be an AC charger.

[0046] The above SECC transmits and receives information related to electric vehicle charging through communication with the Electric Vehicle Communication Controller (EVCC), a control system included in the electric vehicle, based on the ISO 15118-2(20) or DIN SPEC 70121 standard.

[0047]

[0048] Figure 2 is a diagram showing an example of a connection block diagram of an electric vehicle charger and an electric vehicle proposed in this specification.

[0049] When connecting a charger and an electric vehicle with a connector (Charge Plug) to charge an electric vehicle, as shown in Fig. 2, the EVCC (Electric Vehicle Communication Controller, 210) of the electric vehicle and the SECC (Supply Equipment Communication Controller, 110) of the charger communicate with each other through the CP (Control Pilot) in the connector. At this time, the communication protocol can use the PWM (Pulse Width Modulation) specified in IEC 61851, or the HLC (High Level Communication) specified in ISO 15118-2(20) or DIN SPEC 70121. The HLC is a communication method that combines PWM and OFDM (Orthogonal Frequency Division Multiplexing). When communicating only with the PWM, the charger is used when charging the electric vehicle with AC (Alternating Current) power, and in the case of HLC, the charger is used when charging the electric vehicle with AC or DC (Direct Current) power.

[0050] The above PWM communication is a method of communicating by controlling the size of the duty cycle of the pulse signal, and the amount of current required by the charger changes depending on the size of the pulse signal width that the EVCC of the electric vehicle transmits to the SECC of the charger as a CP.

[0051] HLC between the charger and the electric vehicle can be implemented using a PLC (Power Line Communication) module, as specified in ISO 15118-3. HLC begins when the charger's SECC transmits a 5% duty cycle PWM signal to the electric vehicle's EVCC. The charger then synthesizes an OFDM signal with the 5% duty cycle PWM signal to perform HLC. This PWM signal serves as a carrier signal, and unlike communications using only PWM, HLC can retrieve and transmit various information about the electric vehicle.

[0052] In addition, a charger that charges an electric vehicle with AC power (hereinafter referred to as an "AC charger") can communicate with the electric vehicle using HLC (hereinafter referred to as "HLC(AC)") and PWM for AC charging in the ISO 15118-2(20) standard. However, currently, there are few AC chargers and electric vehicles that support HLC(AC), so most use PWM communication. The PWM communication is a communication method in which the charger and the electric vehicle exchange the intensity of the current required momentarily, and since it is a limited communication method, it is not possible to distinguish the user's electric vehicle or confirm information such as the vehicle's status using this communication method. In addition, in the case of the PWM communication, a communication error may occur in the electric vehicle, which may lead to overcharging, and if the electric vehicle is overcharged, there is a high possibility of a fire. If the AC charger can obtain and know the SoC (State of Charge) information of the electric vehicle, the AC charger can estimate the amount of power that can be charged to the electric vehicle using the SoC information. When charging an electric vehicle by comparing the predicted power amount with the power amount of the electric vehicle being charged in real time, overcharging of the electric vehicle can be prevented.

[0053]

[0054] Figure 3 shows an example of a V2G message flow diagram of the ISO 15118 standard to which the method proposed in this specification can be applied.

[0055] Specifically, Fig. 3a shows the V2G message flow of the ISO 15118-2 standard, and Fig. 3b shows the V2G message flow of the ISO 15118-20 standard.

[0056] That is, Figure 3 shows the message flow when SECC performs HLC for V2G (Vehicle to Grid) with EVCC and ISO 15118-2 and ISO 15118-20 standards.

[0057] The SECC can receive the EVCCID (Electric Vehicle Communication Controller Identification), which is a unique number of the electric vehicle, from the EVCC through the SessionSetupReq message of the Common message among the V2G messages of ISO 15118-2 and ISO 15118-20. That is, the EVCC transmits the SessionSetupRsp message containing the EVCCID of the electric vehicle to the SECC. The unique value of the electric vehicle, such as the EVCCID, can be used in places where it is necessary to recognize the electric vehicle as a unique object, such as automatic charging payment for the electric vehicle.

[0058] And, the charger can obtain the SoC information of the electric vehicle through the ChargeParameterDiscoveryReq message of the Common message in the ISO 15118-2 standard. If the charging current of the electric vehicle is DC, the charger can obtain the SoC information of the electric vehicle through the DC_EVChargeParameter of the ChargeParameterDiscoveryReq message. That is, the electric vehicle transmits the ChargeParameterDiscoveryReq message including the SoC information of the electric vehicle to the charger. If the charging current of the electric vehicle is AC, the SoC information of the electric vehicle can be obtained through the AC_EVChargeParameter of the ChargeParameterDiscoveryReq message. That is, the electric vehicle transmits the ChargeParameterDiscoveryReq message including the SoC information of the electric vehicle to the charger.

[0059] Additionally, the charger can obtain information about the electric vehicle's SoC through DC messages such as CableCheckReq and PreChargeReq.

[0060] And, when using the ISO 15118-20 standard, if the charging current of the electric vehicle is DC, the charger can obtain the SoC of the electric vehicle through the DC_ChargeParameterDiscovery message of the DC message, and if the charging current of the electric vehicle is AC, the charger can obtain the SoC information of the electric vehicle through the AC_ChargeParameterDiscovery message of the AC message. And, the message defined in the DIN SPEC 70121 standard is the same as that for charging with DC in ISO 15118-2.

[0061] As discussed above, if a charger can obtain the SoC information of an electric vehicle using messages defined in ISO 15118-2(20) and DIN, the charger can predict the charging power of the electric vehicle based on the SoC information. Furthermore, the charger can prevent the electric vehicle from being overcharged by comparing the predicted charging power with the actual charging power.

[0062]

[0063] Figure 4 is a diagram showing an example of a communication block diagram of an electric vehicle and an electric vehicle equipped with a PLC module proposed in this specification.

[0064] To utilize the DC message of FIG. 4 in an AC charger, the AC charger (100) may be equipped with a PLC module (120), as illustrated in FIG. 4. Connecting the PLC module to the AC charger allows the AC charger to exchange messages with an electric vehicle (200) via HLC. However, the electric vehicle must be a vehicle that supports HLC.

[0065] Messages exchanged between the AC charger and the electric vehicle via HLC can store information about the electric vehicle in external storage via the communication module (130).

[0066]

[0067] Figure 5 is a flowchart showing an example of a method for obtaining EVCCID and SoC information of an electric vehicle proposed in this specification.

[0068] That is, FIG. 5 relates to a method for obtaining EVCCID and SoC information of an electric vehicle using an AC charger connected to a PLC module, and a method for charging the electric vehicle using the SoC information.

[0069] First, connect the charging plug of the AC charger to the electric vehicle (S501).

[0070] And, before charging the electric vehicle with the AC charger, it is checked whether the electric vehicle supports HLC communication. That is, the SECC of the AC charger and the EVCC of the electric vehicle are connected to the CP, and the SECC transmits a 9 V (dc) signal with a 5% duty cycle to the EVCC to indicate the start of HLC communication (S502).

[0071] And, when the SECC and the EVCC are connected through HLC communication, the EVCC transmits to the SECC whether AC and DC charging is possible using the ISO 15118-2(20) protocol through the supportedAppProtocolReq message.

[0072] When the SECC and the EVCC are connected through communication that satisfies the ISO 15118-2 or ISO 15118-20 standard, the SECC obtains the EVCCID from the EVCC through the SessionSetupReq message of the Common message.

[0073] The EVCCID obtained above can be used in technologies that utilize the unique value of electric vehicles, such as a method for automatic payment using electric vehicles.

[0074] Next, we will look at how to obtain SoC information for electric vehicles through the ISO 15118-2 standard or the ISO 15118-2 standard.

[0075] First, we will look at how to obtain SoC information of electric vehicles through communication that satisfies the ISO 15118-2 standard.

[0076] The AC charger can check whether the electric vehicle is AC or DC charged through the ChargeParameterDiscoveryReq message of the Common message (S503-1a), and can check the SoC of the electric vehicle through the AC_EVChargeParameter or DC_EVChargeParameter information included in the ChargeParameterDiscoveryReq message (S503-2a). If the value of the electric vehicle SoC is determined to be abnormal, the AC charger proceeds with the work of re-acquiring the SoC of the electric vehicle.

[0077] Next, we will look at how to obtain SoC information of electric vehicles using communication that satisfies the ISO 15118-2 standard.

[0078] The AC charger determines whether the electric vehicle's charging power is AC or DC charging through the ServiceSelection of the Common message (S503-1b).

[0079] If it is AC charging, the AC charger can check the SoC information of the electric vehicle in AC_ChargeParameterDiscovery through HLC(AC) (S503-2b).

[0080] In the case of DC charging, the AC charger can check the SoC information of the electric vehicle in DC_ChargeParameterDiscovery through the HLC (hereinafter referred to as HLC(DC)) for DC charging. Here, if the SoC value of the electric vehicle obtained above is determined to be abnormal, the AC charger proceeds to obtain the SoC information of the electric vehicle again.

[0081] In addition, the SECC of the AC charger stores the EVCCID and SoC information of the electric vehicle obtained through the previously discussed steps externally, such as in a CSMS (Charging Station Management System) or CEMS (Charging Energy Management System), or internally in the charger through a communication module (S504).

[0082] Here, the SoC information of the above-mentioned stored electric vehicle can be used in various ways, and one of them is to calculate the predicted amount of power charged by the electric vehicle and use it to prevent overcharging of the electric vehicle.

[0083] After storing the SoC information of the above electric vehicle, if HLC (AC) communication is supported, HLC (AC) is maintained to allow SECC and EVCC to communicate (S505). If HLC (AC) is not supported, SECC and EVCC cannot communicate, so HLC communication is disconnected (S506) and SECC and EVCC communicate using PWM (S507).

[0084] When communication between the SECC and EVCC is established, the AC charger transmits AC power to the electric vehicle (S508). At this time, the AC charger compares the expected charging power calculated by the electric vehicle's SoC with the actual charging power and proceeds with charging the electric vehicle (S509). Furthermore, the electric vehicle is charged so that the actual charging power does not exceed the expected charging power. If the actual charging power exceeds the expected charging power, the AC charger immediately stops charging the electric vehicle (S510).

[0085]

[0086] Fig. 6 is a diagram showing an example of CP voltage change when an electric vehicle charger and an electric vehicle proposed in this specification perform PWM communication.

[0087] That is, Fig. 6 shows the CP voltage change when receiving SoC information of an electric vehicle through HLC / HLC(DC). When the SECC receives the EVCCID of the electric vehicle and SoC information of the electric vehicle through HLC or HLC(DC), it terminates the connection of HLC or HLC(DC) and proceeds with communication through PWM.

[0088] In Fig. 6, when the SECC and EVCC are not connected, the CP voltage is 12 Vdc. When the AC charger and the electric vehicle are connected, the CP voltage drops to 9 Vdc. At this time, the SECC changes the CP into a pulse signal with a voltage of -12 Vpeak to 9 Vpeak and a width of 5% to perform HLC with the EVCC. When the EVCC receives the -12 Vpeak to 9 Vpeak pulse signal with a 5% duty cycle, it starts communicating with the SECC via HLC. Since HLC communication transmits a message by synthesizing PWM and OFDM, the CP voltage changes as shown in the signal in the HLC / HLC(DC) section of Fig. 6.

[0089] When the SECC receives SoC information from an electric vehicle via the HLC or HLC(DC), the SECC either suspends the HLC or arbitrarily disconnects it. When the HLC is disconnected, the AC charger and the electric vehicle are connected to each other via the CP, but communication between the AC charger and the electric vehicle is not possible, so the CP voltage becomes 9 Vdc.

[0090] The SECC then verifies the SoC information transmitted by the EVCC, calculates the expected charge amount, and communicates with the EVCC via PWM. The PWM duty cycle must exceed 10% and not exceed 5%. After this process, the AC charger delivers power to the electric vehicle, charging it.

[0091]

[0092] Fig. 7 is a diagram showing an example of CP voltage change when an electric vehicle charger and an electric vehicle proposed in this specification perform HLC communication.

[0093] That is, Fig. 7 shows the voltage change of the CP until the electric vehicle is charged with AC power after the SECC of the AC charger receives the EVCCID and SoC information of the electric vehicle through the HLC (AC).

[0094] As with the previously discussed Fig. 6, in order to communicate with the electric vehicle and HLC, the SECC changes the voltage of the CP to a pulse signal of -12 Vpeak to 9 Vpeak and a width of 5%.

[0095] When HLC communication is connected, the SECC obtains the EVCCID of the electric vehicle from the electric vehicle through the SessionSetupReq message. Furthermore, communications that follow the ISO 15118-2 standard can obtain the SoC information of the electric vehicle through the AC_EVChargeParameter of the ChargeParameterDiscoveryReq message, and communications that follow the ISO 15118-20 standard can obtain the SoC information of the electric vehicle through the AC_ChargeParameterDiscovery message.

[0096] After the AC charger obtains the EVCCID and SoC information of the electric vehicle, the AC charger calculates the expected charging power to be charged to the electric vehicle, maintains the HLC (AC) with the electric vehicle, and transfers power to the electric vehicle to AC charge the electric vehicle.

[0097]

[0098] Figure 8 is a flowchart showing an example of a method for obtaining EVCCID and SoC information of an electric vehicle proposed in this specification.

[0099] That is, FIG. 8 is a method for an AC charger in an electric vehicle charging system to obtain EVCC (Electric Vehicle Communication Controller) ID (Identification) corresponding to a unique value of an electric vehicle and SoC (State of Charge) information of the electric vehicle from an electric vehicle.

[0100] First, the AC charger equipped with a PLC (Power Line Communication) module checks the HLC (High Level Communication) connection with the electric vehicle (S810).

[0101] The above HLC can communicate using a PWM (Pulse Width Modulation) signal and an OFDM signal through a CP (Control Point) Line corresponding to a physical signal line between the AC charger and the electric vehicle using the PLC module.

[0102] The above OFDM signal can be used to transmit communication messages.

[0103] The step of verifying the HLC connection may include the step of the AC charger transmitting a 9Vdc signal with a 5% duty cycle to the electric vehicle through the CP line.

[0104] And, the initial state of the above HLC connection can be set to DC (Direct Current) message communication in DC charging mode.

[0105] When the AC charger receives information about the charging mode of the electric vehicle from the electric vehicle, the set DC charging mode can be maintained or changed to the AC charging mode based on the received information about the charging mode.

[0106] The above charging mode can be a DC charging mode or an AC charging mode.

[0107] Information about the above charging mode can be obtained through the ChargeParamterDiscoveryReq message of the ISO 15118 protocol.

[0108] And, the AC charger obtains the EVCC ID and SoC information of the electric vehicle from the electric vehicle through the HLC connection (S820).

[0109] The above EVCC ID can be transmitted through the SessionSetupReq message of the ISO 15118 protocol, and the SoC information of the electric vehicle can be obtained through the ChargeParameterDiscoveryReq message of the ISO 15118-2 protocol or the AC or DC ChargeParameterDiscoveryReq message of the ISO 15118-20 protocol.

[0110] If the charging mode of the electric vehicle is a DC charging mode, SoC information of the electric vehicle is obtained through DC_EVChargeParameter of the ChargeParameterDiscoveryReq message of the ISO 15118-2 protocol or through the DC_ChargeParameterDiscovery message of the ISO 15118-20 protocol, and if the charging mode of the electric vehicle is an AC charging mode, SoC information of the electric vehicle can be obtained through AC_EVChargeParameter of the ChargeParameterDiscoveryReq message of the ISO 15118-2 protocol or through the AC_ChargeParameterDiscovery message of the ISO 15118-20 protocol.

[0111] And, the AC charger stores the acquired EVCC ID and SoC information of the electric vehicle (S830).

[0112] The EVCC ID and SoC information of the electric vehicle obtained above may be stored in an external device through a communication module implemented in the AC charger or stored inside the AC charger.

[0113] The above external device may be a Charging Station Management System (CSMS) or a Charging Energy Management System (CEMS).

[0114] And, the AC charger determines whether to maintain the HLC connection depending on the type of message receiving the SoC information of the electric vehicle (S840).

[0115] The type of the above message can be an AC message or a DC message.

[0116] And, the step of determining whether to maintain the HLC connection may include a process of maintaining the HLC connection when the AC charger and the electric vehicle communicate through an AC message of the ISO 15118-2 or ISO 15118-20 protocol in an AC charging mode, and terminating the HLC connection and performing communication through PWM communication when the AC charger and the electric vehicle communicate through a DC message of the ISO 15118-2 or ISO 15118-20 protocol in a DC charging mode.

[0117] The HLC connection may be terminated after obtaining SoC information of the electric vehicle or after the AC charger transmits information about a communication error to the electric vehicle via the HLC connection.

[0118] And, the AC charger transmits AC power to the electric vehicle to perform charging (S850).

[0119] Additionally, the AC charger may calculate a predicted charging amount of the electric vehicle using the stored EVCC ID and SoC information of the electric vehicle before step S850, compare the calculated predicted charging amount with the actual charging amount currently being charged to the electric vehicle, and then determine whether to stop charging the electric vehicle based on the comparison result.

[0120] If the actual charge amount is greater than the predicted charge amount, charging of the electric vehicle is stopped.

[0121]

[0122] The embodiments described above are combinations of components and features of the present invention in a predetermined form. Each component or feature should be considered optional unless explicitly stated otherwise. Each component or feature may be implemented without being combined with other components or features. Furthermore, it is also possible to form an embodiment of the present invention by combining some components and / or features. The order of operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is self-evident that claims that do not have an explicit citation relationship in the patent claims may be combined to form an embodiment or may be incorporated as a new claim through a post-application amendment.

[0123] Embodiments of the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may be implemented by one or more ASICs (Application Specific Integrated Circuits), DSPs (Digital Signal Processors), DSPDs (Digital Signal Processing Devices), PLDs (Programmable Logic Devices), FPGAs (Field Programmable Gate Arrays), processors, controllers, microcontrollers, microprocessors, etc.

[0124] When implemented via firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, or the like that performs the functions or operations described above. The software code may be stored in memory and executed by a processor. The memory may be located within or external to the processor and may exchange data with the processor via various known means.

[0125] It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the essential characteristics thereof. Therefore, the above detailed description should not be construed in any way as limiting but rather as illustrative. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the scope of equivalents of the present invention are intended to be included within the scope of the present invention.

[0126] The method for obtaining the EVCC ID and SoC of an electric vehicle in the electric vehicle charging system of the present invention has been described with a focus on examples applied to electric vehicles, but can also be applied to various other systems.

Claims

1. In an electric vehicle charging system, a method for an AC charger to obtain an EVCC (Electric Vehicle Communication Controller) ID (Identification) corresponding to a unique value of an electric vehicle and SoC (State of Charge) information of the electric vehicle from an electric vehicle, A step of confirming the HLC (High Level Communication) connection between the AC charger having a PLC (Power Line Communication) module and the electric vehicle; A step in which the AC charger obtains the EVCC ID and SoC information of the electric vehicle from the electric vehicle through the HLC connection; A step of storing the acquired EVCC ID and SoC information of the electric vehicle; A step of determining whether to maintain the HLC connection depending on the type of message receiving the SoC information of the electric vehicle; and A method characterized in that the AC charger comprises a step of transmitting AC power to the electric vehicle to perform charging.

2. In paragraph 1, A method characterized in that the acquired EVCC ID and the SoC information of the electric vehicle are stored in an external device through a communication module implemented in the AC charger or stored inside the AC charger.

3. In paragraph 2, A method characterized in that the external device is a CSMS (Charging Station Management System) or a CEMS (Charging Energy Management System).

4. In paragraph 1, The above HLC is characterized in that it communicates using a PWM (Pulse Width Modulation) signal and an OFDM signal through a CP (Control Point) Line corresponding to a physical signal line between the AC charger and the electric vehicle using the PLC module.

5. In paragraph 4, The steps to check the above HLC connection are: A method characterized in that the AC charger comprises a step of transmitting a 9Vdc signal with a 5% duty cycle to the electric vehicle through the CP line.

6. In paragraph 5, A method characterized in that the initial state of the above HLC connection is set to DC (Direct Current) message communication in DC charging mode.

7. In paragraph 6, A method characterized in that, when the AC charger receives information about the charging mode of the electric vehicle from the electric vehicle, the set DC charging mode is maintained or changed to the AC charging mode based on the received information about the charging mode.

8. In paragraph 7, A method characterized in that the above charging mode is a DC charging mode or an AC charging mode.

9. In paragraph 8, A method characterized in that information about the above charging mode is obtained through a ChargeParamterDiscoveryReq message of the ISO 15118 protocol.

10. In paragraph 9, A method characterized in that the above EVCC ID is transmitted via a SessionSetupReq message of the ISO 15118 protocol.

11. In paragraph 10, A method characterized in that the SoC information of the electric vehicle is acquired through a ChargeParameterDiscoveryReq message of the ISO 15118-2 protocol or a ChargeParameterDiscoveryReq message of AC or DC of the ISO 15118-20 protocol.

12. In paragraph 11, If the charging mode of the above electric vehicle is DC charging mode, the SoC information of the above electric vehicle is obtained through the DC_EVChargeParameter of the ChargeParameterDiscoveryReq message of the ISO 15118-2 protocol or through the DC_ChargeParameterDiscovery message of the ISO 15118-20 protocol. A method characterized in that, when the charging mode of the electric vehicle is AC charging mode, the SoC information of the electric vehicle is acquired through the AC_EVChargeParameter of the ChargeParameterDiscoveryReq message of the ISO 15118-2 protocol or through the AC_ChargeParameterDiscovery message of the ISO 15118-20 protocol.

13. In paragraph 1, A step of calculating a predicted charging amount of the electric vehicle using the stored EVCC ID and SoC information of the electric vehicle; A step of comparing the calculated predicted charging amount with the actual charging amount currently being charged to the electric vehicle; and A method characterized by comprising a step of determining whether to stop charging the electric vehicle based on the comparison result.

14. In paragraph 13, A method characterized by comprising a step of stopping charging of the electric vehicle when the actual charging amount is greater than the predicted charging amount.

15. In paragraph 1, A method characterized in that the type of the above message is an AC message or a DC message.

16. In paragraph 15, The step of determining whether to maintain the above HLC connection is: When the AC charger and the electric vehicle communicate via AC messages of the ISO 15118-2 or ISO 15118-20 protocol in AC charging mode, a step of maintaining the HLC connection; and A method characterized in that it comprises a step of terminating the HLC connection and performing communication using PWM communication when the AC charger and the electric vehicle communicate via a DC message of the ISO 15118-2 or ISO 15118-20 protocol in DC charging mode.

17. In paragraph 16, A method characterized in that the HLC connection is terminated after obtaining SoC information of the electric vehicle or after the AC charger transmits information about a communication error to the electric vehicle through the HLC connection.

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