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| Question | Answer |
|---|---|
| What are the conditions under which we open the relays? | Over current, over temperature, over voltage, under voltage, upon request over CAN |
| How many ways are there to change the relay state? Is BMS Carrier the only one controlling them? | Kill switch also controls the relay state externally. |
What are the incoming CAN messages? | BMS Carrier CAN Messages |
| What are the outgoing CAN messages? | BMS Carrier CAN Messages |
| 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? | Check relay states and ensure the batteries are within manufacturers specifications for over voltage, under voltage, over temperature, etc. |
| How are we computing the SOC? | We will be using an OCV-SoC and coulomb counting method to start. (Ask Micah Black) |
| What are the temperature ranges for fan control? | An offset linear fan control curve to start for easy implementation. This will make the fans run at full speed before the batteries reach maximum temperature. |
| Can fan status be monitored? Does it need to be? (rpm too high/too low) | Yes, fans can and should be monitored to see any malfunctions. Specifications can be found here: https://noctua.at/media/wysiwyg/Noctua_PWM_specifications_white_paper.pdf |
| How many cells? | |
How many thermistors? | |
| How many voltage measurements? | |
| How do you access the thermistors and cell voltages for all of the cells? | |
| How do you access the cell voltages? | access is through the isospi chip, and to the ltc7811, we can use the ltc_afe driver for that. |
Misc Links
Some Guys Masters Thesis on EV BMS - https://pdfs.semanticscholar.org/7b9d/934eaf10114c091e1229ed4d65de3a1002a0.pdf
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