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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 it doesn't have enough charge. 
  • 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? 





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