KR20130102404A - Device of power line communication for electric vehicle charging and system for it - Google Patents

Abstract

PURPOSE: A power line communication (PLC) modem for charging an electric vehicle and a power line communication system for the same are provided to offer a PLC modem enabling a high-speed data communication between an electric vehicle and an electric vehicle charging system, thereby providing overall monitoring of a charging process, charging state information, safety requirements, and various services for users. CONSTITUTION: A PLC modem included in an electric vehicle charging system to charge a battery for an electric vehicle through a cable assembly from a power charging system, comprises a PLC physical layer (301), a PLC medium access control (MAC) layer (302), a network layer (303), and a transmission layer. The PLC physical layer is coupled with a power supply terminal or control pilot built in the cable assembly to deliver a PLC signal. The PLC MAC layer generates an association message for initiation of PLC between the electric vehicle and the power charging system. The network layer is connected to the PLC MAC layer and a convergence service access point (SAP) to deliver data received from the power charging system to an upper layer. [Reference numerals] (301) PLC physical layer; (302) PLC MAC layer; (303) Network layer; (304) Transmission layer; (305) Upper layer; (306) Coupling control service element; (307) PLC signal coupling; (310) Power terminal; (311) Control pilot; (312) Communication medium; (330) Smart metering device; (AA) I/O SAP (CAN communication); (BB) I/O SAP (SPI, UART) communication

Description

Power line communication modem and power line communication system for electric vehicle charging {Device of power line communication for electric vehicle charging and system for it}

The present invention relates to a power line communication method for charging an electric vehicle, and more particularly, power line communication between an electric vehicle and an electric vehicle charging system for ensuring high speed data communication such as a charging process, status information, and safety service during electric vehicle charging. The present invention provides a power line communication modem and a power line communication system using the same.

There is an increasing interest in international carbon emission constraints and the environment, and smart grid technology that optimizes energy efficiency is rapidly developing.

Smart Grid is a next-generation intelligent grid that maximizes efficiency by distributing energy demand by exchanging information on real-time power usage between power providers and consumers by adding information and communication technology to the existing grid. Development of core technologies such as two-way information communication technology, smart metering technology, distributed energy management technology, electrical quality compensation technology, electrical energy storage technology, energy monitoring and diagnostic technology, and security technology are essential for this smart grid to become a reality. Electric energy storage technology, which is one of the core technology, is expected to maximize the energy distribution effect if energy storage battery and electric vehicle technology are applied universally.

Accordingly, in order for electric vehicles to successfully enter the global automobile market, electric vehicle charging infrastructure must be fully equipped. In addition, communication facilities between electric vehicles and charging systems become an important issue in order to support stable charging and various value-added services. Currently, ISO / IEC, an international standard organization, uses power line communication (PLC) technology for electric vehicle charging systems. It is selected as the communication technology and standardization of IEC 15118 Vehicle to grid communication interface.

In recent years, power line communication has been studied under various scenarios such as outdoor, in-home, in-plane, in-ship, and in-vehicle due to its low installation cost and easy configuration. In order to apply power line communication to various application fields, frequency response, channel characteristics such as noise, impedance, and system application methods are studied.

An object of the present invention is to provide a high-speed data communication to ensure the overall monitoring, charging status information, the safety information and the provision of various services for the user when charging the electric vehicle for power.

It is also an object of the present invention to provide a power line communication modem between an electric vehicle and an electric vehicle charging system to ensure high speed data communication during electric vehicle charging.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

Power line communication modem included in the electric vehicle charging system for charging the power through the cable assembly from the power charging system according to an aspect of the present invention for solving the above problems, one or more power built in the cable assembly A PLC Physical Layer coupled with a supply terminal or a control pilot to carry a Power Line Communication (PLC) signal; A PLC Medium Access Control (MAC) layer for generating an association message for initiating power line communication between the electric vehicle and the power charging system; A network layer connected to the PLC MAC layer through a convergence SAP (Service Access Point) to deliver data received from the power charging system to a predetermined upper layer; And a transport layer.

The power line communication modem according to the embodiment of the present invention may be connected to a power supply line of a battery of the electric vehicle or the power charging system by a predetermined power supply line to receive power required for driving the power line communication modem.

In this case, the network layer uses Internet Protocol version 6 (IPv6) or IPv6 over Low power WPAN (6LowPAN), and the transport layer is a transmission control protocol (TCP) or a user datagram protocol (User Datagram Protocol). UDP) can be used.

Preferably, the power line communication modem according to the embodiment of the present invention may further include an association control service element (association control) which is an application layer protocol for supporting power line communication between the electric vehicle and the power charging system. .

For example, when the power line communication modem is mounted on the electric vehicle, an electric vehicle control unit (EV-ECU), a battery management system (BMS), and an on-electric vehicle of the electric vehicle are mounted. The apparatus may further include a first interface for performing automobile network communication with at least one of an on-board charger (OCC).

In this case, data collected from at least one of the EV-ECU, BMS, and OBC may be delivered to the upper layer through the first interface and the associated control service element. The upper layer may generate a message including at least one of charging state information, battery state information, and authentication information and transmit the message to the power charging system through the PLC physical layer.

The charging state information may include at least one of information regarding a battery charging mode, charging start / end, charging error, charging control, charging current / voltage / power, and charging reservation. The battery state information may include at least one of battery charge rate, battery state information, battery temperature, cell voltage, cell external temperature, cell internal resistance, and charge / discharge current. The authentication information may include at least one of identification information of the electric vehicle, user identification information, identification information of the electric vehicle charging system, and other authentication information.

As another example, when the power line communication modem is mounted in the power charging system, a serial peripheral interface bus (SPI) or universal asynchronous receiver / transmitter (UART) communication is performed with at least one of the charging-related hardware and the smart meter of the power charging system. It may further include a second interface for performing.

In this case, the upper layer generates charging service related information based on data transmitted through the second interface and the associated control service element, and generates the charging service related information through the PLC physical layer. Can be sent to. The charging service related information may include at least one of power charge, charging time, load information, meter data, charging data, stability, and other electric vehicle information.

The upper layer may control a power supply state of the power charging system or a battery charge state of the electric vehicle, and the battery charge state control may include initialization work for power line communication, start, stop or complete battery charge, and a standby state of charge. Switching to or switching to a shutdown state.

According to another aspect of the present invention, there is provided a method for charging an electric vehicle using power line communication, including: performing an initialization operation for initiating power line communication with a power charging system connected through a cable assembly; Exchanging a first message including at least one of charging state information and authentication information through power line communication with the power charging system when the initialization operation is completed; And charging the battery based on power supplied through the cable assembly when a set-up operation for charging the battery is completed through the first message exchange.

In this case, the initializing operation locks the connector of the cable assembly, and includes at least one of a power line communication modem, a battery management system (BMS), and an on-board charger (OCC). It may include the process of wake-up (wake-up).

On the other hand, the electric vehicle charging method using the power line communication according to an embodiment of the present invention, when the signal reception failure or error occurs in the first message exchange step, the set-up operation for charging the battery does not complete the charging The method may further include shutting down a power supply of the system and transitioning to a standby state of charge.

Further, the battery charging step may include converting AC power supplied from the power charging system into DC power through the OBC; And performing the battery charging by transferring the DC power converted by the OBC to the battery unit when the battery charge state satisfies a predetermined condition.

In addition, the battery charging step, the step of monitoring the state of charge of the battery according to a time or a predetermined period; And transmitting a second message including battery status information to the power charging system through power line communication.

The charging of the battery may include receiving charge control information or user request information from the power charging system or an external communication medium through power line communication; And controlling the state of charge of the battery according to the received charge control information or user request information.

Furthermore, the electric vehicle charging method using the power line communication according to an embodiment of the present invention, the step of switching the electric vehicle and the power charging system to the shutdown (shutdown) state when the battery charge is completed or an error in the battery charging process It may further include.

At this time, the shutdown step, the power supply is stopped until the current delivered to the electric vehicle battery to zero, disconnect the connector of the cable assembly connected to the electric vehicle, or until the voltage of the battery enters a predetermined stable range And standby mode.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the present invention by those skilled in the art. And can be understood and understood.

According to the present invention, it is possible to provide a high-speed data communication to ensure the overall monitoring, charging status information, safety information and the provision of various services for the user during the charging of the electric vehicle.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is a view showing an example of an electric vehicle charging system according to an embodiment of the present invention.
2 is a view showing an example of a cross section of the cable assembly used in the AC charging method of the electric vehicle according to the present invention and the embodiment.
3 is a diagram illustrating an example of a power line communication modem in an electric vehicle charging system according to an embodiment of the present invention.
4 is a block diagram illustrating an example in which an electric vehicle and an electric vehicle charging system are connected by using a power line communication modem according to an embodiment of the present invention.
5 is a flowchart illustrating a power charging process and a charging state of an electric vehicle using power line communication according to an embodiment of the present invention.
6 is a view showing an example of the configuration of an electric vehicle equipped with a power line communication modem according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details.

1 is a view showing an example of an electric vehicle charging system according to an embodiment of the present invention.

Referring to FIG. 1, in general, a charging infrastructure for charging an electric vehicle 110 is converted into direct current (DC) by receiving a slow charging stand 120 using a single phase AC power and a high voltage power in the ground. There is a quick charging stand 130 for supplying power.

Slow charging stand 120 for supplying AC power is a device for supplying AC power to the electric vehicle 110 receives electricity from the AC power. The electric vehicle 110 converts AC power supplied from the slow charging stand 120 into DC power through an on-board charger (OBC) 111 to charge power to the battery 112.

On the other hand, the fast charging stand 130 for supplying the DC power is supplied to the electric vehicle 110 by converting into a DC power supplied with electricity from the AC power, the supplied DC power to the battery 112 without a separate conversion process To charge.

Although not shown in FIG. 1, the slow charging stand 120 and the quick charging stand 130 may be a device capable of inputting / outputting charging information required by a user, a control system for controlling a charging process, and reading the amount of power being charged and discharged. And a smart device for communication, a communication device for communicating with an operating system performing a charging system operation and a charging function, and a communication device for electric vehicle charging control.

As such, the electric vehicle performing slow charging or rapid charging of the contact type performs charging using a charging cable and a vehicle charging connector, and performs power line communication using a power line or a control line included in the charging cable.

To this end, the charging cable or the electric vehicle is equipped with a power line communication modem, the power line communication modem according to an embodiment of the present invention will be described as an AC charging method (or slow charging method) for charging the AC power as an example.

2 is a view showing an example of a cross section of the cable assembly used in the AC charging method of the electric vehicle according to the present invention and the embodiment.

The cable assembly that connects the electric vehicle and the AC charging stand consists of a vehicle connector and a charging cable, and the charging cable includes various electric vehicle interfaces. For example, as illustrated in FIG. 2, five interfaces embedded in the charging cable 200 may include one or more AC power terminals 201 and 202, a ground terminal 203, a control pilot 204 and an AC power supply. It may include a connection switch 205.

The power line communication can be performed while supplying power through the AC power terminals 201 and 202, and the control pilot 204 is used to determine the state of charge by determining the voltage level of the PWM signal, and the connection switch 205 is Used to determine the connection status of electric vehicle connectors. The illustrated charging cable 200 may be used as a transmission line of a PLC signal, and specifically, the AC power terminals 201 and 202 or the control pilot 204 may be coupled to transmit a power line signal.

Referring to the configuration of the charging cable as described above, the charging state can be determined based on a connection switch circuit, a control pilot circuit, a PWM signal, etc. in the process of charging the electric vehicle power from the AC charging stand. Based on this, when the charging state is determined to be the normal mode, the AC charging stand supplies AC power to the electric vehicle, and the electric vehicle converts the supplied AC power into DC power through the OBC and stores it in the battery.

In addition, the AC charging system and the electric vehicle uses a power line communication modem to ensure high-speed data communication such as a charging process, status information, and safety service during electric vehicle charging using power line communication. In general, power line communication modems are used in systems and electric vehicles, respectively, to enable power line communication between an AC charging system and an electric vehicle.

3 is a diagram illustrating an example of a power line communication modem in an electric vehicle charging system according to an embodiment of the present invention.

The power line communication modem is mounted in the electric vehicle and the AC charging system, respectively, to enable power line communication between the electric vehicle and the AC power system.

Referring to FIG. 3, a power line communication modem 300 according to an embodiment of the present invention may include a PLC physical layer 301, a PLC media access control (MAC) layer 302, a network layer 303, and a transport layer 304. And an upper layer 305.

Specifically, the PLC physical layer 301 is connected to the AC power terminal 310 or the control pilot 311 described above in FIG. 2 through the communication medium 312 of the cable assembly and the PLC signal coupling interface 307. It is connected to perform power line communication. In this case, the communication medium 312 is a physical medium for transmitting and receiving power line communication signals to a cable assembly connecting the electric vehicle and the electric vehicle charging system.

The PLC MAC layer 302 is a sub-layer of the data link layer, which is connected to the network layer 303 and the convergence SAP (Service Access Point) 308 so as to receive data received from the outside through the PLC physical layer 301 to an upper layer ( 305 and the data received from the upper layer 305 to the PLC physical layer 301 to be transmitted to the outside.

In detail, the PLC MAC layer 302 generates and transmits a MAC message including an association message related to initiation, completion, etc. of power line communication between the electric vehicle and the AC charging system.

The network layer 303 utilizes Internet Protocol version 6 (IPv6) and IPv6 over Low power WPAN (6LowPAN). 6LowPAN is a network technology that connects IPv6 to existing IP network by installing IPv6 on low power Wireless Personal Area Network (WPAN) using IEEE 802.15.4 as physical layer and MAC layer. Actively communicates with external IP networks, allowing the location of sensors and devices to be flexible.

The transport layer 304 belongs to the fourth OSI (Open System Interconnection) layer connected to the protocol of the upper layer 305, and includes a transmission control protocol (TCP) and a user datagram protocol (UDP). Etc. TCP is a protocol that guarantees reliability. It uses Seq No. and Ack No. to re-transmit in case of data loss or flow failure that may occur during data transmission. UDP is also a protocol for data transmission or a high speed one-way communication without data retransmission. The transport layer 304 is connected to the upper layer 305 and the control SAP 309.

The upper layer 305 is a protocol that provides a communication function between upper layers in a layered protocol structure. In the OSI basic reference model, it refers to a set of protocols that provide a communication function that is a basis for realizing distributed processing by cooperating with each other in an upper layer, a session layer, a presentation layer, and an application layer.

When the power line communication modem 300 according to an embodiment of the present invention is mounted inside an electric vehicle, the upper layer 305 receives data to be transmitted from the electric vehicle I / O control hardware to the outside of the electric vehicle. For example, the electric vehicle I / O control hardware includes an electric vehicle control unit (EV-ECU) 320, a battery management system (BMS) 321, an OBC 321, and the like. And, the charging state information, the battery state information, etc. can be received from such hardware.

As another example, when the power line communication modem 300 is mounted in the AC charging system, the upper layer 305 may receive data such as power supply amount and power usage measured by the smart meter 330 included in the AC charging system. have.

The upper layer 305 generates a message including the data transferred to the outside, and sequentially delivers the generated message to the transport layer 304, the network layer 303, and the PLC MAC layer 302, thereby providing a PLC physical layer ( 301). In addition, by grasping the type and characteristics of the data included in the signal received through the power line communication from the outside, the signal is transmitted to the hardware of the electric vehicle or the AC charging system corresponding to the type of data.

Referring back to FIG. 3, the power line communication modem 300 may consider IPv6 based SEP 2.0 as the OSI layer 3 to layer 7. The power line communication modem 300 further includes an association control service element 306 for performing data transmission and reception in connection with the electric vehicle I / O control hardware or the hardware of the AC charging system.

The association control service element 306 is one of the common protocols of the OSI application layer that enables an electric vehicle to be connected to an AC charging system to perform all functions related to power charging. Provides control function to enable / disable. In general, all application layer protocols run on top of an association by default.

For example, the associated control service element 306 included in the power line communication modem of the electric vehicle includes electric vehicle I / O control hardware such as the EV-ECU 320, the BMS 321, and the OBC 322 and the CAN ( Controller Area Network) communication may be performed to transfer data (charge state information, battery state information, etc.) generated inside the electric vehicle to the upper layer 305.

Alternatively, the associated control service element 306 included in the power line communication modem of the AC charging system may include hardware such as a smart meter 330 of the AC charging system, a serial peripheral interface bus (SPI), a universal asynchronous receiver / transmitter (UART), or the like. Data may be delivered to the upper layer 305 through communication of.

Further, the PLC signal coupling interface 307 shown in FIG. 3 performs a function of coupling the power line communication signal through a signal coupling with the communication medium 312, see FIG. 4 below. Will be explained.

As such, the electric vehicle and the AC charging system through the power line communication modem 300 transmits and receives data related to electric power charging of the electric vehicle through power line communication.

Table 1 illustrates an example of data transmitted and received between an electric vehicle (EV) and an electric vehicle charging system (EVCS) using a power line communication modem according to an embodiment of the present invention.

Message form Message content Send and receive message charge
Status Information Charge mode (charge / discharge)
Battery charge schedule
Start / Stop Battery Charging
Charging error
Charge control
Charge current, voltage, power BMS
EVCS
PLC, EV-ECU, EVCS
EV-ECU, EVCS
PLC, OBC
OBC, BMS battery
Status Information Battery charge rate (%)
Battery Status Information
Battery temperature (cell internal / external temperature)
Voltage / Current Charge Constant BMS
BMS
BMS
EVCS Certification Information EV ID or user ID
EVCS ID
Certification Information PLC, EV-ECU
PLC, EVCS
EV-ECU, EVCS Etc
Service information Electricity charge / charge time / load information
Meter data
Billing data
safety
Other electric vehicle information EVCS
smart meter
billing device
EVCS
smart device

Referring to Table 1, as data related to electric vehicle charging between the electric vehicle and the AC charging system using the power line communication modem according to the present invention, charging state information (eg, battery charging mode, charging start / end, charging error) , Charge control, charge current / voltage / power, charge reservation, etc.), battery status information (e.g. battery charge rate, battery status information, battery temperature, cell voltage, cell temperature, cell internal resistance, charge / discharge current, etc.) , Authentication information (e.g., electric vehicle ID, user ID, EVCS ID, other authentication information, etc.) and other data related to the service (e.g. power bill / charge time / load information, meter data, billing data, stability, other electricity Car information, etc.).

4 is a block diagram illustrating an example of a form in which an electric vehicle and an electric vehicle charging system are connected through a cable assembly according to an exemplary embodiment of the present invention.

4 is a view for explaining an interface for transmitting and receiving PLC signals between an electric vehicle charging system and an electric vehicle according to an embodiment of the present invention, and an illustration of a power line communication modem is omitted.

Referring to FIG. 4, the electric vehicle charging system 400 according to the present invention is connected to the electric vehicle 420 through the cable assembly 410.

As described above in FIG. 2, the cable assembly 200 includes five interfaces, such as one or more AC power terminals 201, 202, ground terminal 203, control pilot 204, and connection switch 205. do. That is, in order to utilize the cable assembly as a power line communication transmission line, it is necessary to perform impedance matching and to consider characteristics of the power transmission lines 201 and 202 and the control pilot line 204 in order to minimize distortion and return loss of the PLC signal. desirable.

Referring again to FIG. 4, the power transmission lines 401, 402 of the electric vehicle charging system 400 are coupled to the power transmission lines 411, 412 of the cable assembly, which in turn is the OBC (420) of the electric vehicle 420. Or is coupled to a charger 421 to be used for power transmission and power line signal transmission. When coupling a power line signal utilizing a power transmission line, the PLC signal transmission line includes PLC signal coupling interfaces 403 and 422. When coupling a power line signal, the PLC signal transmission line may be coupled behind the power switch or in front of the power switch by connecting the power switch before and after with a bypass filter.

Alternatively, when transmitting and receiving a PLC signal using the control pilot line, the ground terminal 404 and the control pilot line 405 of the electric vehicle charging system 400 is connected to the ground terminal 413 and control pilot of the cable assembly 410. Coupled to line 414, which in turn is connected to the interior of the electric vehicle. When coupling a power line signal utilizing a control pilot line, the electric vehicle charging system 400 and the electric vehicle 420 include a cable assembly 410 and a PLC signal coupling interface 406, 423.

Although not shown in FIG. 4, inductive coupling may be used to prevent PWM 12V waveform damage or signal distortion when the PLC signal is coupled to the control pilot line.

Meanwhile, the electric vehicle 420 charges the electric power supplied from the power transmission lines 411 and 412 to the battery 424 through the OBC 421, and charges the charge controller 425 for monitoring and controlling the charging process. And an insulation monitor unit 426.

5 is a flowchart illustrating a power charging process and a charging state of an electric vehicle using power line communication according to an embodiment of the present invention.

Referring to FIG. 5, when the separated electric vehicle and the AC charging system are connected through the cable assembly (501), the power line communication modem of the electric vehicle and the power line communication modem of the AC charging system perform an initialization operation for initiating power line communication. Perform 502.

Specifically, when the cable assembly connected to the AC charging system in the state 501 successfully connected to the electric vehicle, the electric vehicle locks the connector of the cable assembly in the initialization operation 502, the power line communication modem of the electric vehicle Wake up BMS and OBC.

When the initialization operation 502 is confirmed to have been performed normally and set-up is completed (503), the electric vehicle and the AC charging system check and monitor the bilateral insulation state, and display the necessary messages to start charging the battery. Transmit and receive (504).

For example, the insulation monitor unit 424 described above with reference to FIG. 4 may check an insulation state between the electric vehicle and the AC charging system, and transmit and receive a related message for converting AC power supplied from the AC charging system into DC power. . At this time, the charging state information (eg, battery charging mode, charging start / end, charging error, charging control, charging) as illustrated in Table 1 above as a preliminary operation for initiating AC / DC power conversion and / or battery charging operation. Current / voltage / power, charge reservation, etc.) or authentication information (eg, electric vehicle ID, user ID, EVCS ID, other authentication information, etc.).

Next, when a signal reception failure or an error occurs or a set-up operation for charging the battery is not completed in the process of transmitting / receiving a charge-related message in step 503, it is regarded as an error mode (505), and charging with an electric vehicle. The system transitions to a standby state for disconnection between systems (506).

On the other hand, if the charging-related message transmission and reception is normally performed in the state 504, and the set-up operation for charging the battery is completed (507), monitoring of the AC / DC power conversion process before the electric vehicle battery charging is performed. Operation is performed (508).

For example, in the AC / DC power conversion monitoring state 508, when the power conversion unit (eg, OBC) state and basic operations for power conversion are normally confirmed, the electric vehicle 420 described above with reference to FIG. 4 is connected to the cable assembly 410. AC power supplied from the EV charging system 400 is converted into DC power through the OBC 421.

In addition, the charging control unit 425, the BMS, etc. check the battery charge status in real time or at a predetermined period, and as a result, battery status information (e.g., battery charge rate, battery status information, battery temperature, cell voltage, cell external temperature, cell interior) Messages including resistance, charge / discharge current, etc.) can be generated and transmitted to the AC charging system via powerline communication. In addition, by checking the charge control information received from the AC charging system or the user request information transmitted from the external communication medium through power line communication, it is possible to perform the battery state control accordingly.

At this time, when the reason for the stop of charging occurs when checking the battery state, the charging control unit or the BMS of the electric vehicle may switch to the charging standby state 506 (509).

In the standby state 506, when the connection between the electric vehicle and the AC charging system is not resumed or when the power supply or power line communication is not performed smoothly such as the standby state lasts for a certain period of time, the non-connection to terminate the connection between the electric vehicle and the AC charging system is performed. The connection state 500 may be switched (510).

Next, as a result of the charging process monitoring, the state of charge of the electric vehicle satisfies a predetermined condition in the electric vehicle OBC 421, or the state of the battery normalizes even in the standby state 506, or the state of the battery satisfies the predetermined condition in the power conversion process 508. In operation 512, the DC power converted by the OBC 421 of the electric vehicle 420 may be transferred to the vehicle battery 424 to convert the battery into a charging state.

Thereafter, when the battery charging operation is completed or an error occurs during the power transmission process (513), the electric vehicle or the AC charging system transitions to a shutdown state (514). Shutdown state 514 includes a case where the current supplied to the electric vehicle battery is zero or the connector of the cable assembly connected to the electric vehicle is disconnected, and the standby state until the voltage of the battery enters a predetermined stable range. And may be converted to 506.

In addition, even when switching to the standby state 506 in the above-described charging process of the electric vehicle, when the problem of switching to the standby state is not solved or a problem that makes it difficult to start charging the battery may be switched to the shutdown state 513. (516).

In the shutdown state 513, the connection between the electric vehicle and the AC charging system may be immediately terminated without switching to the standby state according to a predetermined condition (517).

As such, the power line communication modem according to the embodiment of the present invention is in charge of power line communication between both immediately after the electric vehicle and the AC charging system are connected, and can control all processes of battery power charging.

6 is a view showing an example of the configuration of an electric vehicle equipped with a power line communication modem according to an embodiment of the present invention.

Referring to FIG. 6, when the electric vehicle 600 and the connector 610 of the cable assembly are connected, the power line communication modem 601 is a transmission line (eg, an AC power terminal) used for power supply and PLC signal transmission from the connector 610. And a control pilot).

Through this, the power line communication modem 601 may receive a PLC signal from the AC charging system and transmit the PLC signal including information related to electric vehicle charging to the outside. In addition, as described above, the power line communication modem 601 may be configured to perform CAN communication with the BMS 603, the OBC 604, or the inverter 605 in order to collect information such as a charge state and a battery state of the electric vehicle. Coupling using the CAN interface.

As such, the power line communication modem 601 according to an embodiment of the present invention, in order to perform the power line communication for transmitting and receiving the various data described in Table 1 in the process before receiving power from the AC charging system, the battery charging process, power line As shown in FIG. 6, the communication modem 601 may be connected to the battery unit 606 through a predetermined power supply line 607 so as to receive a separate power from the battery unit 606 of the electric vehicle.

This is distinguished from the conventional power line communication modem using a portion of the power supplied from the outside during the battery charging process as the power source of the modem.

Further, although not shown in FIG. 6, the power line communication modem may be connected to a separate modem controller to perform functions such as power on / off, message generation and transmission, message reception and transmission, etc. according to a control signal of the modem controller.

The above description is merely illustrative of the technical idea of the present invention, and various modifications and changes may be made without departing from the characteristics of the present invention. Therefore, the embodiments described in the present invention are not intended to limit the technical idea of the present invention but to explain, and the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

Claims (24)

A power line communication modem included in an electric vehicle charging system for charging an electric vehicle battery through a cable assembly from a power charging system,
A PLC physical layer coupled with one or more power supply terminals or control pilots embedded in the cable assembly to carry a power line communication (PLC) signal;
A PLC Medium Access Control (MAC) layer for generating an association message for initiating power line communication between the electric vehicle and the power charging system;
A network layer connected to the PLC MAC layer through a convergence SAP (Service Access Point) to deliver data received from the power charging system to a predetermined upper layer; And
A power line communication modem in an electric vehicle charging system, comprising a transport layer. The method of claim 1,
The power line communication modem of the electric vehicle charging system, characterized in that connected to the power supply of the battery of the electric vehicle or the power charging system and a predetermined power supply line to supply the power required to drive the power line communication modem. The method of claim 1,
The network layer uses Internet Protocol version 6 (IPv6) or IPv6 over Low power WPAN (6 LowPAN),
The transport layer is a power line communication modem in an electric vehicle charging system, characterized in that using the Transmission Control Protocol (TCP) or the User Datagram Protocol (UDP). The method of claim 1,
And an association control service element (association control), which is an application layer protocol for supporting power line communication between the electric vehicle and the power charging system. 5. The method of claim 4,
When the power line communication modem is mounted on the electric vehicle,
At least one of an electric vehicle control unit (EV-ECU), a battery management system (BMS) and an on-board charger (OCC) and an automotive network of the electric vehicle A power line communication modem in an electric vehicle charging system, further comprising a first interface for performing communication. The method of claim 5,
And data collected from at least one of the EV-ECU, BMS, and OBC is transmitted to the upper layer through the first interface and the associated control service element. The method according to claim 6,
The upper layer generates a message including at least one of charging state information, battery state information, and authentication information and transmits the message to the power charging system through the PLC physical layer. modem. The method of claim 7, wherein
The state of charge information,
A power line communication modem in an electric vehicle charging system comprising at least one of information regarding a battery charging mode, charging start / end, charging error, charging control, charging current / voltage / power, and charging reservation. The method of claim 7, wherein
The battery state information,
A power line communication modem in an electric vehicle charging system comprising at least one of battery charge rate, battery status information, battery temperature, cell voltage, cell outside temperature, cell internal resistance, and charge / discharge current. The method of claim 7, wherein
The authentication information,
And at least one of identification information of the electric vehicle, user identification information, identification information of the electric vehicle charging system, and other authentication information. 5. The method of claim 4,
When the power line communication modem is mounted on the power charging system,
Electric vehicle charging further comprises a second interface for performing a Serial Peripheral Interface Bus (SPI) or Universal Asynchronous Receiver / Transmitter (UART) communication with at least one of the charging-related hardware and smart meters of the power charging system Powerline communication modem in the system. 12. The method of claim 11,
The upper layer is
And generate charging service related information based on the data transmitted through the second interface and the associated control service element, and transmit the generated charging service related information to the electric vehicle through the PLC physical layer. Power line communication modem in an electric vehicle charging system. The method of claim 12,
The charging service related information,
A power line communication modem in an electric vehicle charging system comprising at least one of power charge, charging time, load information, meter data, charging data, stability, and other electric vehicle information. The method of claim 1,
The upper layer controls the power supply state of the power charging system or the battery charge state of the electric vehicle,
In the electric vehicle charging system, the battery charge state control may include an initialization operation for power line communication, a start, stop, or completion of battery charging, a transition to a standby state of charging, or a transition to a shutdown state. Powerline communication modem. In the electric vehicle charging method using power line communication,
Performing an initialization operation to initiate power line communication with a power charging system connected via a cable assembly;
Exchanging a first message including at least one of charging state information and authentication information through power line communication with the power charging system when the initialization operation is completed; And
When the set-up operation for charging the battery is completed through the first message exchange, charging the battery based on power supplied through the cable assembly,
The initialization operation step,
Lock the connector of the cable assembly and wake-up at least one of a power line communication modem, a battery management system (BMS) and an on-board charger (OCC). An electric vehicle charging method using power line communication, characterized in that. 16. The method of claim 15,
The state of charge information,
At least one of information regarding a battery charging mode, charging start / end, charging error, charging control, charging current / voltage / power, and charging reservation,
The authentication information,
The electric vehicle charging method using power line communication, characterized in that it comprises at least one of the identification information of the electric vehicle, user identification information, identification information of the electric vehicle charging system and other authentication information. 17. The method according to claim 15 or 16,
When the signal reception failure or error occurs in the first message exchange step, when the set-up operation for charging the battery is incomplete, further comprising the step of stopping the power supply of the power charging system and switching to a charging standby state. Electric vehicle charging method using power line communication. 16. The method of claim 15,
The battery charging step,
Converting AC power supplied from the power charging system to DC power via the OBC; And
And charging the battery by transferring the DC power converted by the OBC to a battery unit when the battery charge state satisfies a predetermined condition. The method of claim 15 or 18,
The battery charging step,
Monitoring the state of charge of the battery in real time or according to a predetermined period; And
And transmitting the second message including the battery status information to the power charging system through power line communication as a result of the monitoring. 20. The method of claim 19,
The battery state information,
A method for charging an electric vehicle using power line communication comprising at least one of battery charge rate, battery state information, battery temperature, cell voltage, cell external temperature, cell internal resistance, and charge / discharge current. 20. The method of claim 19,
The battery charging step,
Receiving charge control information or user request information from the power charging system or an external communication medium through power line communication; And
And charging the battery according to the received charge control information or user request information. 16. The method of claim 15,
And switching the electric vehicle and the power charging system to a shutdown state when the battery charge is completed or an error occurs in the battery charging process. The method of claim 22,
The shutdown step,
Turning off the power supply and switching to standby mode until the current delivered to the electric vehicle battery is zero, or the connector of the cable assembly connected to the electric vehicle is disconnected, or the voltage of the battery enters a predetermined stability range. An electric vehicle charging method using power line communication. 16. The method of claim 15,
The power line communication modem,
A PLC physical layer coupled with one or more power supply terminals or control pilots embedded in the cable assembly to carry a power line communication (PLC) signal;
A PLC Medium Access Control (MAC) layer for generating an association message for initiating power line communication between the electric vehicle and the power charging system; And
And a higher layer for performing data transfer between the power charging system and the electric vehicle through the power line communication, and controlling a power supply state of the power charging system or a battery charge state of the electric vehicle. Electric vehicle charging method using.

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