...
- used for state of the charge model:
- state of the charge status of battery how much eneergy
- we need fast logging for a good soc model
- overcharge
- over temperature
- over current
- undercharge
- power distribution tells u something’s wrong
- dc dc failed
- precharge board:
- precharge failed
- controls the relay
- if AFE undervoltage, we disconnect the entire relay
- you can also disconnect from car power button so that comes from can
- other conditions:
- controls fans based on the temp
- car turn on: checks battery pack status, then connects relays
- turns on the current sense board: firmware doesn't need to care it's literally a line that goes to it.
- PI will be SOC algorithm
- connetion between pi's havne't made decision
How it works:
- Three AFE's AFEs
- Temperatures measured via thermistors (AFEs)
- gpio's control the mux (for AFE)
- adc: for reading measurements
- we talk to this bish using iso-spi
- LTC6811 is the chiB
...
| Question | Answer |
|---|---|
| What are the conditions under which we disconnect the relays? | |
| How many ways are there to change the relay state? Is BMS Carrier the only one controlling them? | |
What are the incoming CAN messages? | |
| What are the outgoing CAN messages? | |
How is state of charge calculated? | |
| What's the maximum rate we can have for voltage measurement? | |
| What's the maximum rate we can have for current measurement? | |
| What should it do when we power the car ON? | |
| How are we computing the SOC? | |
| What are the temperature ranges for fan control? |