KR101665485B1 - The method of signal strength measurements between electric vehicles and charging systems using ISO/IEC12139-1 power line communication - Google Patents

The method of signal strength measurements between electric vehicles and charging systems using ISO/IEC12139-1 power line communication Download PDF

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Publication number
KR101665485B1
KR101665485B1 KR1020150085218A KR20150085218A KR101665485B1 KR 101665485 B1 KR101665485 B1 KR 101665485B1 KR 1020150085218 A KR1020150085218 A KR 1020150085218A KR 20150085218 A KR20150085218 A KR 20150085218A KR 101665485 B1 KR101665485 B1 KR 101665485B1
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electric vehicle
evse
signal strength
channel estimation
power line
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KR1020150085218A
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Korean (ko)
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종 수 이
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(주)아이앤씨테크놀로지
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/546—Combination of signalling, telemetering, protection
    • B60L11/1838—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/542—Systems for transmission via power distribution lines the information being in digital form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/90—Vehicles comprising electric prime movers
    • B60Y2200/91—Electric vehicles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5433—Remote metering

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

In particular, the present invention relates to a method for measuring signal strength in power line communication between an electric vehicle and a charging system, and more particularly, to a method for implementing the method using an ISO / IEC12139-1 registered as an international standard, ) Includes transmitting a broadcast message using ISO / IEC 12139-1 power line communication; A charging system (EVSE, 200 ~ 203) receiving a broadcast message transmitted from an electric vehicle (EV) 100 transmits an ACK message; The EV 100 transmits a Unicast message requesting channel estimation to each of the charging systems (EVSE, 200 to 203) that have transmitted the ACK message after receiving the ACK message. The charging systems (EVSE, 200 to 203) receiving the unicast message requesting the channel estimation calculate the channel estimation and transmit the channel estimation result to the EV 100 using a unicast message. Measuring a signal intensity of a PLC channel through a channel estimation result data value, the electric vehicle EV 100 receiving a channel estimation result unicast message from each of the charging systems EVSE 200 to 203; (EVSE, 200 to 203) to which the electric vehicle (EV) 100 is physically connected by comparing the measurement results of the signal strength between the respective charging systems (EVSE, 200 to 203) and the electric vehicle ; The present invention provides a method for measuring signal strength between an electric vehicle and a charging system using power line communication according to ISO / IEC12139-1.

Description

[0001] The present invention relates to a method for measuring signal strength between an electric vehicle and a charging system using power line communication,

The present invention relates to a method of measuring signal strength in power line communication between an electric vehicle and a charging system, and more particularly, to a method of measuring the signal strength in an electric vehicle communication system using an ISO / IEC12139-1 To a method of measuring signal strength between an electric vehicle and a charging system using power line communication.

In the ISO / IEC 15118 V2G CI standard, power line communication (PLC) was selected as a communication technology between electric vehicle (EV) and charging system (EVSE). In the ISO / IEC15118-3, HPGP (HomePlug Green PHY) was selected as the power line communication technology. If the communication interference between the electric car and the national AMI occurs, the communication standard of the electric car should be replaced with a high speed PLC such as AMI And ISO / IEC12139-1, the Korean PLC technology.

The communication frequency used in HPGP (HomePlug Green PHY) is 2MHz ~ 28MHz, and the probability of collision is very high because it almost overlaps with communication frequency (2.15MHz ~ 23.15MHz) of domestic AMI standard technology. Therefore, power line communication technology between domestic electric car and charging system should use ISO / IEC12139-1.

1 shows a configuration in which an electric vehicle (EV) 100 and a charging system (EVSE, 200 to 203) are connected with a power line to charge an electric vehicle at an electric charging station. However, association issues arise in electric vehicles (EV) 100 and charging systems (EVSE, 200 ~ 203) connected through power lines. For example, assuming that there are four charging systems (EVSE, 200 to 203) in an electric charging station and that an electric vehicle (EV, 100) is connected to a charging system for charging, Since the charging systems EVSE 200 to 203 are physically connected to the same power line, there arises a problem that the electric vehicle EV 100 has to identify which charging system (EVSE, 200 to 203) is connected. When the electric vehicle EV 100 to be charged is connected to a charging system EVSE 200, the electric vehicle EV 100 transmits a broadcast message via a power line communication (PLC) (EVSE, 200-203) by virtue of the fact that other charging systems (EVSE, 201-203) that are not directly connected to the charging system (EVSE, 100) .

The HomePlug Green PHY uses a protocol called SLAC (Signal Level Attenuation Characterization) to prevent this and to accurately and reliably identify only the physically connected charging system (EVSE, 200).

Therefore, in order to construct an electric car charging system through the power line communication of ISO / IEC12139-1, a Korean PLC technology, it is necessary to solve such an association problem.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide a method of measuring the signal strength of a power line communication in configuring an electric vehicle and a charging system through the PLC communication technology of ISO / IEC12139-1. .

In order to achieve the above object, a method for measuring a signal strength between an electric vehicle and a charging system using an ISO / IEC12139-1 power line communication according to the present invention comprises the steps of: using an ISO / IEC12139-1 power line communication in an electric vehicle (EV) Transmitting a broadcast message; Transmitting an ACK message from charging systems (EVSE, 200 to 203) receiving a broadcast message transmitted from an electric vehicle (EV) 100; The EV 100 transmits a Unicast message requesting channel estimation to each of the charging systems (EVSE, 200 to 203) that have transmitted the ACK message after receiving the ACK message. The charging systems (EVSE, 200 to 203) receiving the unicast message requesting the channel estimation calculate the channel estimation and transmit the channel estimation result to the EV 100 using a unicast message. Measuring the signal intensity of the PLC channel through the channel estimation result data value of the electric vehicle EV 100 receiving the channel estimation result unicast message from each of the charging systems EVSE 200 to 203; (EVSE, 200 to 203) to which the electric vehicle (EV) 100 is physically connected by comparing the measurement results of the signal strength between the respective charging systems (EVSE, 200 to 203) and the electric vehicle ; And a control unit.

The type of the broadcast message includes not only the broadcast of the MSDU packet but also the format of using the extended areas 000111 to 111111 of the MMI packet.

The channel estimation result data value may be a BPS value allocated per symbol; Tone map information indicating the number of bits allocated to each tone; AGC gain value; And a control unit.

The method of measuring the signal strength between the electric vehicle and the electric vehicle charging system according to the present invention having the above-described method has the following effects.

First, it is possible to implement an electric car charging system through ISO / IEC12139-1 domestic PLC technology.

Second, by applying the same technology as the Smart Grid AMI system, which is expanding to the national grid, ISO / IEC12139-1 can be applied to the electric charging system, the effect of resolving the conflict between the two standards (HPGP and ISO / IEC12139-1) have.

1 is a view showing a configuration environment of an electric vehicle (EV) 100, a charging system (EVSE, 200 to 203), and a power system according to a preferred embodiment of the present invention.
2 is a flowchart showing an operation for measuring a PLC channel signal intensity in an electric vehicle (EV) 100.
3 is a flowchart showing an operation for measuring the PLC channel signal intensity in the charging system (EVSE, 200 to 203).
FIG. 4 is a diagram showing items provided in the channel estimation request in ISO / IEC 12139-1. FIG.
5 is a diagram showing items of channel estimation result data in ISO / IEC 12139-1.
Fig. 6 is a view showing an item of a frame body block type (FBBT) in ISO / IEC 12139-1. Fig.

Specific features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. It is to be understood that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

1 is a view showing an environment between electric vehicles (EV) 100 to 103 and charging systems (EVSE, 200 to 203) according to a preferred embodiment of the present invention. Here, the number of electric vehicles (EVs) and charging systems (EVSEs) is assumed to be four. It can be explained that several electric charging systems (EVSE, 200 to 203) can be formed in the electric vehicle charging station and electric vehicles (EV, 100) to be charged can also be connected to several charging systems at the same time.

2 shows a flow chart for operating in an electric vehicle (EV) 100 for measuring PLC signal strength when an electric vehicle EV 100 is connected to a charging system EVSE 200 for charging.

When the electric vehicle EV 100 is connected to the charger S2-1, the electric vehicle EV 100 transmits a broadcast message to find a charging system connected to the PLC channel S2-2. And upon receipt of an ACK signal for the transmitted broadcast message (S2-3), a step of receiving a broadcast ACK message (S2-4) may be performed.

Next, when an ACK message for a broadcast message is received, the EV 100 transmits a unicast message requesting channel estimation to a charging system (EVSE, 200) that has transmitted an ACK message S2-5), and receiving a unicast message including channel estimation result values from the charging system (EVSE, 200) (S2-6).

Next, the electric vehicle EV 100 may analyze the received channel estimation result message to measure the signal intensity of the PLC channel (S2-7).

If there is an additional charging system (EVSE, 201 to 203) that has sent an ACK for a broadcast message, it moves to step S2-5 to transmit a unicast message requesting channel estimation, If channel estimation of all the charging systems (EVSE, 200 ~ 203) is completed, the next step can be performed. (S2-8)

The EV 100 then compares the signal strengths obtained from the channel estimation result values received from the charging systems EVSE 200 to 203 to determine whether the electric vehicle EV 100 is directly connected to the charging system EVSE, 200-203) of the first embodiment (S2-9).

3 shows a flow chart for operating in a charging system (EVSE, 200-203) for PLC signal strength measurement when an electric vehicle EV 100 is connected to a charging system EVSE 200 for charging.

The charging system EVSE 200 to 203 receives a broadcast message from the EV 100 in step S3-1 and transmits an ACK message in response to the broadcast in step S3 -2). ≪ / RTI >

When the charging system EVSE 200 to 203 receives the channel estimation request message from the electric vehicle EV 100 in step S3-3, the charging system EVSE 200-320 performs the step S3-4 of calculating the channel estimation, And transmitting the resultant value as a unicast message (S3-5).

Fig. 4 shows the items provided in the channel estimation request in ISO / IEC 12139-1.

The EV system 100 transmits a channel estimation request message by composing a message through this item and the charging system EVSE 200 to 203 receives the PLC channel status (PRS) through the PRS (pseudo random number) And derives a channel estimation result value.

5 shows an item of channel estimation result data in ISO / IEC 12139-1.

When the charging system EVSE 200 to 203 receives the channel estimation request message (FIG. 4) from the EV 100, it compares the PRS item value with the PRS item value in FIG. 4, .

In ISO / IEC 12139-1, one symbol of a PLC channel consists of 256 tone maps (Tones # 0 to # 255). The signal state for each tone is indicated by a 2-bit tone map. For example, if the signal state of tone # 0 is good, the tone map of tone # 0 becomes 3 (decimal). If the signal state is medium, the tone map becomes 2 (decimal) If there is no signal condition, the tone map is displayed as 0.

In FIG. 5, the BPS (number of bits allocated per symbol) is a value obtained by summing up the tone map values according to the tone signal states as described above. When the PLC channel state is good, the BPS has a large value, and when the channel state is poor, the BPS has a small value. Therefore, the PLC channel status can be known through the BPS value.

Also, in FIG. 5, the PLC channel state can be known through the AGC gain value. AGC is characterized in that the AGC gain value becomes large when the channel signal is weak and the AGC gain value becomes small when the signal is good. Therefore, by referring to the AGC gain value, the PLC channel state can be known.

6 shows an item of the frame body block type (FBBT) in ISO / IEC 12139-1.

The broadcast message transmitted from the EV 100 can be transmitted as an MSDU packet. However, when the broadcast message of the MSDU packet is transmitted according to the ISO / IEC12139-1 MAC characteristic, the ACK response is transmitted only by one station . Accordingly, the present invention includes a feature of constructing and using a broadcast message using an MMI extension packet to which the items (000111 to 111111), which are reserved sections, of the FBBT items of FIG. 6 are applied.

Specifically, in the present invention, a method of measuring the signal strength of the ISO / IEC12139-1 power line communication is as follows.

First, in FIG. 5, signal strengths can be measured by comparing values of TM (tone maps # 0 to # 255). A tone having a high signal intensity has a value of 3 (decimal). As the signal intensity is low, the tone map has a small value, so that the signal intensity can be measured through the tone map value.

Second, in FIG. 5, the signal strength can be measured through the BPS (number of bits allocated per symbol) value. Since the BPS represents the sum of 256 top maps, the signal strength of the power line communication can be measured through the characteristic that the BPS value is high when the signal is good and the BPS value is low when the signal is weak.

Third, the signal strength can be measured through the AG (AGC gain) value in FIG. The AGC gain can be measured by a signal having a large value when the signal is weak and a signal having a low value when the signal is large.

The electric vehicle EV 100 to be charged can determine which charging system is directly connected through the three signal intensity measuring methods in the channel estimation result message received from the charging system (EVSE, 200 to 203) do. It is determined that the charging system (EVSE, 200 to 203) having the highest signal strength is a charging system (EVSE) directly connected to the electric vehicle (EV, 100).

100: electric vehicle (EV)
200 to 203: Charging system (EVSE)

Claims (9)

Transmitting a broadcast message in an electric vehicle (EV) 100 using ISO / IEC12139-1 power line communication;
Transmitting an ACK message from the charging systems (EVSE, 200 to 203) receiving the broadcast message transmitted from the electric vehicle (EV) 100;
The EV 100 transmits a Unicast message requesting channel estimation to each of the charging systems (EVSE, 200 to 203) that have transmitted the ACK message after receiving the ACK message.
The charging systems (EVSE, 200 to 203) receiving the unicast message requesting the channel estimation calculate the channel estimation and transmit the channel estimation result to the EV 100 using a unicast message.
Measuring the signal intensity of the PLC channel through the channel estimation result data value of the electric vehicle EV 100 receiving the channel estimation result unicast message from each of the charging systems EVSE 200 to 203; And
(EVSE, 200 to 203) to which the electric vehicle (EV) 100 is physically connected by comparing the measurement results of the signal strength between the respective charging systems (EVSE, 200 to 203) and the electric vehicle ; , ≪ / RTI &
The broadcast message is configured by using an MMI extension packet to which items (000111 to 111111), which are reservation sections, of the FBBT items are applied, and a signal between the electric vehicle and the charging system using the power line communication according to ISO / IEC12139-1 Method of measuring strength.
delete The method of claim 1, wherein the ACK message comprises
Wherein the MMI extension packet is applied using the reserved sections (000111 to 111111) of the FBBT items, and the signal strength measurement method between the electric vehicle and the charging system using the electric power line communication according to ISO / IEC12139-1.
2. The method of claim 1, wherein the unicast message requesting the channel estimation comprises:
A TSR defined as a TS request, and a PRS defined as a reservation and a pseudo-random sequence defined as a reservation, according to the ISO / IEC 12139-1 power line communication method.
2. The method of claim 1, wherein the channel estimation result unicast message
An SID defined by a station identifier, a reservation defined as a reservation, a PUNCI defined by a puncturing index, an AG defined by an AGC gain, a TMI defined by a tone map index, a BPS defined by the number of bits allocated per symbol, And a TM defined by the ISO / IEC 12139-1 power line communication.
2. The method of claim 1, wherein measuring the signal strength of the PLC channel through the channel estimation result data comprises:
(Tone map # 0 to # 255) to compare the values of 256 tone maps (TM, tonemap # 0 to # 255) to measure the signal strength. The tone with high signal intensity has a value of 3 (decimal) Wherein the signal intensity is measured through the value of the tone map by having a small value.
2. The method of claim 1, wherein measuring the signal strength of the PLC channel through the channel estimation result data comprises:
Measuring a signal strength through a value of BPS defined as a number of bits allocated per symbol, the BPS indicating a sum of 256 top maps, so that if the signal is good, the value of the BPS has a high value, And the signal strength of the power line communication is measured using the feature that the BPS value is low. The method for measuring the signal strength between the electric vehicle and the charging system using the power line communication according to ISO / IEC12139-1.
2. The method of claim 1, wherein measuring the signal strength of the PLC channel through the channel estimation result data comprises:
Measuring the signal strength using the AG value defined as the AGC gain, wherein the AG value is measured by measuring a signal strength of the power line communication using a characteristic having a large value when the signal is weak and a low value when the signal is large A method for measuring signal strength between an electric vehicle and a charging system using power line communication, characterized by ISO / IEC12139-1.
The method as claimed in claim 1, wherein the step of determining a charging system (EVSE, 200 ~ 203) in which the EV (100)
A charging system having a maximum signal intensity value is provided to the electric vehicle EV 100 by comparing the signal strength measurement results of the charging systems EVSE 200 to the electric vehicle EV 100, And determining that the charging system is a directly connected charging system. A method for measuring signal strength between an electric vehicle and a charging system using an electric power line communication according to ISO / IEC12139-1.
KR1020150085218A 2015-06-16 2015-06-16 The method of signal strength measurements between electric vehicles and charging systems using ISO/IEC12139-1 power line communication KR101665485B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120041498A (en) * 2010-10-21 2012-05-02 한국전력공사 System and method for managing charger of electric vehicle using a network of ami system
KR20150050594A (en) * 2011-08-10 2015-05-08 퀄컴 인코포레이티드 Attenuation level based association in communication networks

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120041498A (en) * 2010-10-21 2012-05-02 한국전력공사 System and method for managing charger of electric vehicle using a network of ami system
KR20150050594A (en) * 2011-08-10 2015-05-08 퀄컴 인코포레이티드 Attenuation level based association in communication networks

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