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EVS28KINTEX, Korea, May 3-6, 2015
Communication Protocol between EV Charger
and Smart Charger Operating System
Nah-Oak Song1, Jihoon Sung 1, Seung-Ho Han2, Sang-Ok Kim2
1Korea Advanced Istitute of Science Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, Korea, [email protected],
2KEPCO Research Institute
Introduction
Communication Protocol between EV Charger and SCOS
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Basic Packet Structure
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Tag: Value to identify the requested process Ver: Protocol Version CMD: Command Code Transmitter ID: ID of transmitting device (SCOS or Charger) Receiver ID: ID of receiving device (SCOS or Charger) Body Size: Length of the body content in Byte Content: Information for the command
Header Body
Tag Ver CMD Transmitter ID Receiver ID Body Size Content
8Byte 4Byte 1Byte 2Byte 2Byte 1Byte
Integer Integer Integer Integer Integer Integer
Command Packets
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Transmitter Receiver CMD Command Code Name Command Explanation
충전기 SCOS
1 CONNECT EV connected
2 READY_CHARGING Ready for Charging
3 START_CHARGING Start Charging
4 COMPLETE_CHARGING Complete Charging
5 CANCEL_CHARGING Cancel Charging
6 PAUSE_CHARGING_ACK Response to PAUSE_CHARGING
7 SOC_REPORT Report the state of charge
8 CHARGER_STATUS_REPORT Report the charger status
9 DISCONNECT EV disconnected
SCOS 충전기
10 CONNECT_ACK Response to CONNECT
11 PROCEED_CHARGING Proceed charging request
12 PAUSE_CHARGING Pause charging request
13 END_CHARGING End charging request
14 READY_CHARGING_ACK Response to READY_CHARGING
15 START_CHARGING_ACK Response to START_CHARGING
16 END_CHARGING_ACKResponse to COMPLETE_CHARGING or CANCEL_CHARGING
17 SOC_REPORT_ACK Response to SOC_REPORT
18 CHARGER_STATUS_REQUEST Request the charger status
19 CHARGER_STATUS_ACKResponse to CHARGER_STATUS_REPORT
20 DISCONNECT_ACK Response to DISCONNECT
Basics for Communication Protocol
Timeout for responding to a request command = 1sec– When a request command is sent, 1 sec is allowed for
responding. Retransmit the request command
– When Timeout occurs. Rules for retransmitting the request command
– Rule1: Retransmission can be made three time for the period of 1 second.
– Rule2: Rule 1 can be repeated three times for the period of 1 minute.
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Definition & Rules (1/3)
Charging Mode– PROMPT: Prompt charging mode
• CHARGING_INFO[PROMPT]– ECONOMIC: Economic charging mode
• CHARGING_INFO[ECONOMIC]
Conditions for complete charging– Requested SoC % for complete charging – Requested time for complete charging– Default condition is SoC=100%.
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Definition & Rules (2/3)
CompleteSoC– Requested SoC % value for complete charging – Integer ≤100
CurSoC– Current SoC % value (Integer ≤100)
CompleteTime– Requested time value for complete charging– Expressed in Day:Hour:Minute
CurTime– Current time expressed in Day:Hour:Minute
Conditions for Complete Charging– CurSoC = CompleteSoC– CurTime = CompleteTime
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Definition & Rules (3/3)
Initial charging– Charging performed initially for 10 min. before
scheduled charging during the economic charging mode. InitialChargingTime
– Proceeding time for initial charging PAUSE == 0/1
– PAUSE status information of the charger• PAUSE == 0: While charging, i.e. before PAUSE_Charging
is received.• PAUSE == 1: While temporally charging paused, i.e. after
PAUSE_Charging_ACK is sent. Report SoC (x min)
– Report SoC for every x minute
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Sequence Diagram Symbols (1/3)
Cond1 && Cond2– AND operation of Cond1 and Cond2 conditions
Cond3 || Cond4– OR operation of Cond3 and Cond4 conditions
– A request command packet is sent.
– A response command packet is sent.
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Sequence Diagram Symbols (2/3)
alt: alternative performance is conducted depending on the condition as follows;– command1() is performed when condition1 is satisfied.– command2() is performed when condition2 is satisfied.– command3() is performed when condition3 is satisfied.
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A B
alt
[condition1]
command1()
[condition2]
command2()
[condition3]
command3()
Sequence Diagram Symbols (3/3)
loop: The performance is repeated while the condition is met. – command4() is performed while condition4 is satisfied.
opt: The performance is conducted when the condition is met.– command5() is performed while condition5 is satisfied.
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A B
command4()
loop
[condition4]
A B
command5()
opt
[condition5]
Comm. Protocol between Charger and SCOS
1. Initialization
2. EV Connection
3. Charging Info Exchange
4. Charging
5. EV Disconnection
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EV CHARGER SCOS
1. Initialization
EV_CONNECT()
2. EV Connection
EV_CONNECT_ACK
CHARGING_INFO()
CHARGING_INFO_ACK
3. Charging Info Exchange
4. Charging
CHARGING_COMPLETED()
EV_DISCONNECT()
5. EV Disconnection
1. Initialization
Process for initializing EV charging – The charger status is reported during initialization process.
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CHARGER SCOS
1. Initialization
2. EV Connection
3. Charging Info Exchange
4. Charging
5. EV Disconnection
CHARGER SCOS
alt
[ CHARGER_RESET]
[SCOS_RESET]
1. CHARGER_STATUS_REPORT()
2. CHARGER_STATUS_ACK
3. CHARGER_STATUS_REQUEST()
4. CHARGER_STATUS_REPORT
5. CHARGER_STATUS_ACK
2. EV Connection
Process for reporting new EV connection – New EV connection is reported to SCOS.
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CHARGER SCOS
1. Initialization
2. EV Connection
3. Charging Info Exchange
4. Charging
5. EV Disconnection
EV CHARGER SCOS
6. EV_CONNECT()
7. CONNECT()
8. CONNECT_ACK
9. EV_CONNECT_ACK
3. Charging Info Exchange
Process for reporting information related charging request – Information related charging request is reported to SCOS
while notifying that charging is ready.
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CHARGER SCOS
1. Initialization
2. EV Connection
3. Charging Info Exchange
4. Charging
5. EV Disconnection
10. CHARGING_INFO[PROMPT]()
11. CHARGING_INFO_ACK
12. READY_CHARGING[PROMPT]()
13. READY_CHARGING_ACK
EV CHARGER SCOS
4. Charging
Process for charging EV– Prompt Charging: Charging is performed right away.– Economic Charging: Charging is scheduled in economic
sense.
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CHARGER SCOS
1. Initialization
2. EV Connection
3. Charging Info Exchange
4. Charging
5. EV Disconnection
4.1. Prompt Charging
Process for charging EV right away
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CHARGER SCOS
14. PROCEED_CHARGING()
15. START_CHARGING
16. START_CHARGING_ACK
loop
[(CurSoC(%) < CompleteSoC(%)) && (CurTime(min) < CompleteTime(min)) == TRUE]
Report SoC (1 min)
opt
[(CurSoC(%) == CompleteSoC(%)) || (CurTime(min) == CompleteTime(min)) ]
17. COMPLETE_CHARGING()
18. END_CHARGING_ACK
4.2. Economic Charging
Economic Charging – Initial Charging Process for charging initially for 10 min. before
scheduled charging. – Scheduled Charging. Process for charging EV according to the schedule to
minimize the charging cost.
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CHARGER SCOSEV
19. CHARGING_COMPLETED()
i. Initial Charging
ii. Scheduled Charging
4.2.1. Economic Charging-Initial Charging
Economic Charging– Initial Charging: Charging is initially performed for 10
min before the scheduled charging.
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CHARGER SCOS
i. Initial Charging
ii. Scheduled Charging
14. PROCEED_CHARGING()
15. START_CHARGING
16. START_CHARGING_ACK
loop
[(InitialChargingTime(min) < 10(min)) && (CurSoC(%) < CompleteSoC(%)) == TRUE]
Report SoC (1 min)
CHARGER SCOS
4.2.2. Economic Charging-Scheduled Charging
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CHARGER SCOS
alt
[PAUSE == 1]
loop
[(CurSoC(%) < CompleteSoC(%)) &&(CurTime(min) < CompleteTime(min)) == TRUE]
17. PAUSE_CHARGING()
18. PAUSE_CHARGING_ACK
19. PROCEED_CHARGING()
20. START_CHARGING
21. START_CHARGING_ACK
opt
[(CurSoC(%) == CompleteSoC(%)) ||(CurTime(min) == CompleteTime(min))]
22. COMPLETE_CHARGING()
23. END_CHARGING_ACK
[(CurSoC(%) == CompleteSoC(%)) || (CurTime(min) == CompleteTime(min))]
24. COMPLETE_CHARGING()
25. END_CHARGING_ACK
Report SoC (5 min)
Report SoC (1 min)
CHARGER SCOS
i. Initial Charging
ii. Scheduled Charging
Economic Charging– Scheduled Charging:
Charging is performed according to the schedule to minimize the charging cost.
5. EV Disconnection
Process for disconnection EV – EV is disconnected.
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27. EV_DISCONNECT()
28. DISCONNECT()
29. DISCONNECT_ACK
EV CHARGER SCOSCHARGER SCOS
1. Initialization
2. EV Connection
3. Charging Info Exchange
4. Charging
5. EV Disconnection
Case Study : Typical Prompt Charging (1/2)
Detailed Sequence Diagram 1.1
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EV CHARGER SCOS
alt
[ CHARGER_RESET]
[SCOS_RESET]
1. CHARGER_STATUS_REPORT()
2. CHARGER_STATUS_ACK
3. CHARGER_STATUS_REQUEST()
4. CHARGER_STATUS_REPORT
5. CHARGER_STATUS_ACK
6. EV_CONNECT()
7. CONNECT()
8. CONNECT_ACK
9. EV_CONNECT_ACK
10. CHARGING_INFO[PROMPT]()
11. CHARGING_INFO_ACK
12. READY_CHARGING[PROMPT]()
13. READY_CHARGING_ACK
Case Study: Typical Prompt Charging (2/2)
Detailed Sequence Diagram 1.2
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14. PROCEED_CHARGING()
15. START_CHARGING
16. START_CHARGING_ACK
loop
[(CurSoC(%) < CompleteSoC(%)) && (CurTime(min) < CompleteTime(min)) == TRUE]
Report SoC (1 min)
opt
[(CurSoC(%) == CompleteSoC(%)) || (CurTime(min) == CompleteTime(min)) ]
17. COMPLETE_CHARGING()
18. END_CHARGING_ACK
19. CHARGING_COMPLETED()
20. EV_DISCONNECT()
21. DISCONNECT()
22. DISCONNECT_ACK
EV CHARGER SCOS
Thank you!
Acknowledgement: This work was supported by the National Research Foundation (NRF), Korea [NRF-2013R1A1A2058377]
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