Design Meeting: Car Charging, Power States, Faults, etc.

Scheduled: Nov 12, 2019 at 8:30 PM to 10:00 PM

Charging:

Scenario: Car neutral → connect charging port → disconnect it: (happy)

• Charger interface board would notice the connection.
• Charger interface broadcasts that charging port has been connected. 
• Charger interface thinks we good2charge
  • Cenrtre console: will know, and show, and we're good to charge
• if we try to swtich to drive (we must not be able to) 
• Charger gets disconnected
  • Cenrtre console: will show that we're not charging anymore

Scenario: When to stop?

• BMS needs to know if we're charging, if we are, then when voltage gets high, it asks to stop charging.
• BMS needs to send message to charger board, when we're nearing full charge: limit the current. We need to dynamically tell it.  taper
• if something goes wrong, it faults, and opens relays: 

Scenario: Car neutral → connect charging port → disconnect it: (something goes wrong, how do we know?)

• Charger interface board would notice the connection.
• Charger interface broadcasts that charging port has been connected. 
• Charger interface thinks we good2charge
  • Cenrtre console: will know, and show, and we're good to charge
• if we try to swtich to drive (we must not be able to) 
• Charger gets disconnected
  • Cenrtre console: will show that we're not charging anymore

Scenario: Car not in neutral → No charging

• still haven't figured out if we're hard setting. 

Scenario: Car turned off → connect charging 

• Charger interface needs to be powered all the time. 
• Charger interface needs 

Power States: 

Scenario: Car power-up sad paths: 

• Pedal boards: show status "power coming from aux/dcdc on the driver display"
• Buttons: Power on doesn't work, we'll know, power off doesn't work, kill switch
• Rear power distribution: We woudln't have enough charge: driver display will show, or can messages will show 
• Rear power distribution: doesn't turn on some of the boards 
• BMS: fault in the battery : gets covered in the heartbeat, those boards always have to be on
• BMS: relays are closed
• MCI: not letting us if precharge completed:
• MCI: problem in the connections

Power States: Faults while Driving

• BMS Carrier Faults: 
  • BMS Broadcasts  I FAULTED AND 
• MCI: 
  • MCI broadcasts  I FAULTED AND 
• Boards going offline: at any time any of the boards could go offline, what should we do if that happens?
  • Power Distirbution
• BMS sends heartbeat message: 
  • Front power distribution
  • Rear power distribution

Todo:

• Rear Power Dsitributoin: we should be able to override if aux doesn't have enough charge to open the relays.
• Question: what happens if the car's in drive mode and we plug in? should we hard set to neutral? 
  
  • possible: debouncing 
• RPI on driver display can be separate can id for the stuff that it only cares about. 
• MCI: should we time out if precharge doesn't complete?