MG-EV-Charger

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Reverse engineering of the on board charger (OBC) used in MG Electric Vehicles

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# MG-EV-Charger
Reverse engineering of the on board charger (OBC) used in MG Electric Vehicles

SAIC motors chargers are cheap and plentiful and some offer V2L (Vehicle To Load) function making them useful in electric vehicle conversion projects.

06/08/23 : Added CAN logs from a 2020 43kWh MG ZS EV during charge.

08/08/23 : Added CAN log from charger "Local CAN" just powered by 12v.

23/11/23 : Actual pinout from connector BY400 on charger :

Pin 1     +12v

Pin 2     Gnd

Pin 3    CAN3H

Pin 4    CAN3L

Pin 5    CAN2H

Pin 6    CAN2L

Pin 7

Pin 8   Onbd Pstv SNR+

Pin 9   Charger wake up

Pin 10  Onbd Ngtv SNR+

Pin 11 Onbd Charge CC

Pin 12 Onbd SNR-

CAN3 is local between charger and charger controller. On there 0x29C would seem to be a command from controller to charger.

CAN2 is pt can.

100k resistors between Pins 12, 8 and 10 seem to satisfy the charge port temp sensors.

Pin 9 seems to do nothing and is not reported on CAN.

Pin 11 is weird. Firstly, it is looped through the HVIL on the AC connector but not the DC. With the HVIL shorted, applying 12v will cause byte 0 in 0x3B8 to read 0x64 (dec 100).

Up to 21k of resistance from 12v to this pin will maintain 0x64. At 22k byte 0 chages from 0x64 to 0x00. No inbetweens.

Seems to be 1 second between state chages on this byte.
In logs from a charging vehicle we see byte 0 go from 0x00 , 06x4 and then ramp down to 0x36 during charge. On my bench charger, with no connection to pin 11 I get 0x00 to 0x64 and then back to 0x00 only.

Charger responds to ID 0x784 on diag can with ID 0x78C. See log.

18/02/24 : Success at last. Charger now running on the bench.

Requirements to run: +12v , GND, Local can, charge port temp sensors bypassed with 2 x 100k resistors. CP connection to bottom middle pin of AC input plug. This is NOT a HVIL as I had thought.

Video of charger working : https://vimeo.com/914791414

CAN : One ID required. 0x29C on 100ms time. No counters or crc. Uploaded a log to run the charger for a few seconds in SavvyCAN format as well as a super crude program for the Arduino DUE.

Charger control will be integrated with ZombieVerter VCU in the very near future.

What I know so far:

0x29c : Byte 0 is max current. e.g. 0x08 = 2A dc.

Setting byte 1 to 0x08 will call in the evse
    
    Byte 2 is usually 24 at start and lsb seems to be the 9th bit of current request in byte 3.
    
    Byte 3 is current request. 20 decimal seems to be 1A on DC side.
    
    Byte 4 always 0x00.
    
    Byte 5 starts at 0x00 then goes to 0x8C at same time as byte 2 when startup commanded
    
    Byte 6 starts at 0x00 then goes to 0x5A at same time as byte 2 when startup commanded
    
    Byte 7 starts at 0x00 then goes to 0x3C at same time as byte 2 when startup commanded
    
Charger does not care when HVDC is applied.

If locks up due to an error a simple 12v power cycle will reset.

13/03/24 : Gen 2 charger with built in DCDC converter and V2L capability now working on the bench.

DCDC Converter Requires CAN Ids : 0x19C and 0x1F1 on PT CAN

For V2L : 0x297 and 0x33F

For Charging : 0x297 , 0x29B , 0x29C , 0x32E , 0x343 , 0x348, 0x394 , 0x396 , 0x39A , 0x39B

MG-EV-Charger

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