MG EV¶
Vehicle Type: MGEV
This vehicle type supports the MG ZS EV (2019-).
Support Overview¶
| Function | Support Status |
|---|---|
| Hardware | Any OVMS v3 (or later) module. Vehicle support: 2019- |
| Vehicle Cable | Right hand OBDII cable (RHD), Left hand OBDII cable (LHD) |
| GSM Antenna | 1000500 Open Vehicles OVMS GSM Antenna (or any compatible antenna) |
| GPS Antenna | 1020200 Universal GPS Antenna (or any compatible antenna) |
| SOC Display | Yes |
| Range Display | Yes |
| Cabin Pre-heat/cool Control | tba |
| GPS Location | Yes (from modem module GPS) |
| Speed Display | Yes |
| Temperature Display | Yes |
| BMS v+t Display | Yes |
| TPMS Display | Yes |
| Charge Status Display | Yes |
| Charge Interruption Alerts | Yes |
| Charge Control | tba |
| Lock/Unlock Vehicle | tba |
| Valet Mode Control | No |
| Others | tba |
Development notes¶
To compile the code you will need to check out the repository, check out the components mongoose, libzip and zlib and copy the file
sdkconfig.default.hw31
from the OVMS.V3/support folder to the OVMS.V3 folder and rename it to
sdkconfig
Community documentation¶
This module is developed from the work provided by the My MG ZS EV community at https://discourse.mymgzsev.com/
Car status¶
The car is accessible over the OBD port when it is running (ignition on) and for around 40 seconds after it is turned off or the car is “tweaked” (lock button pushed, etc).
The OBD port may be kept awake by using the “tester present” message to the gateway ECU. This keeps a lot of systems awake and draws roughly 5A on the 12V bus, so it’s not a good idea to do.
If the car is unlocked, the gateway can be woken if the car is unlocked by pinging the “tester present” message continuously every 100ms until it responds. If the car is locked this simply causes the gateway to go into some kind of zombie proxy mode that isn’t very useful. If the car is locked, the gateway may be woken by sending a session 2 command every 250ms to the gateway.
When the car is charging, the DCDC converter is active, so keeping the electronics awake isn’t really an issue.
In addition, talking to the BCM when the car is locked will cause the car alarm to be set off unless it is sent the “tester present” frame while it is unlocked and continued to do so.
We have four different states:
- Car unlocked but turned off
- Car unlocked and turned on
- Car locked
- Car charging (might be locked)
In each of these states (except the car being turned on) the CAN may be off. In the case of the car being locked or the car charging the gateway will turn on in a zombie state and it will need waking properly in order to get any useful information. The safest mode to assume when we detect a CAN wake up is that the car is locked. It can then transition to any of the other states depending on information gained.
To be researched¶
Can we start/stop charging?
Can we pre-heat?
Can we lock/unlock the car?
Can we get the voltage state of the battery cells rather than just the battery?
Can we determine the charger voltage and current?
Can we determine how many kWh have been delivered in the charge session? We know when it starts and ends and the SoC, so we could infer it?