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This page documents all of car's power states.

Power States

  • On: Car is on and main battery's driving the power. 
  • Off: Car is turned off, only parts of the car are on to facilitate the startup. It's powered off of Aux battery.
  • AUX: Car is turned on without holding the brakes, this will put the car in a mode where some parts: driver display, centre console, etc. are powered. 
  • Emergency: Car was previously on, but some fault happened and therefore parts are disconnected.

Power On (Aux):

Description

User presses the power button and the car goes on the Aux power state. 

Possible Outcomes

ConditionOutcome
Aux BMS indicates a fault.Car won't turn on, all of the boards other than AUX BMS will be off. 

Power On (Main):

Happy Path:

Requirements:

  • AUX Batteries are powering the boards AND have enough charge to close the relays.

User presses the power button while holding the brakes and the car will eventually need to get in the state where the main batteries are connected, and all the boards are being powered from the main battery. Steps are as follows:

  1. User holds the brakes down.
  2. Pedal Board sends a message to the Centre Console.
  3. Centre Console receives the message and now knows that brakes are pressed.
  4. User presses the power button.
  5. Centre Console receives power button press, and will begin the power-up process.
  6. Centre Console sends a message to Aux BMS/Power Distribution to ensure we have enough voltage to close the relays. 
  7. Aux BMS/Power Distribution says that there IS ENOUGH CHARGE.
  8. Centre Console sends a message to Rear Power Distribution to turn on BMS Carrier.
  9. Rear Power Distribution turns ON BMS Carrier.
  10. BMS Carrier tells Centre Console that it's UP.
  11. Centre Console asks BMS Carrier for the state of the batteries and relays.
  12. BMS Carrier checks the state of main battery (includes making sure battery relays are open), state is OK. 
  13. BMS Carrier responds to Centre Console.
  14. Centre Console sends a message to Rear Power Distribution to turn on Motor Controller Interface/Pre-Charge.
  15. Rear Power Distribution turns ON Motor Controller Interface/Pre-Charge.
  16. Motor Controller Interface/Pre-Charge tells Centre Console that it's UP.
  17. Centre Console asks Motor Controller Interface/Pre-Charge for the state of the motor relays.
  18. Motor Controller Interface/Pre-Charge responds to Centre Console, state is OK.
  19. BMS Carrier board checks for the state of batteries, and sends a message to the Centre Console board.


Concerns:

QuestionAnswer
What happens if the user releases the pedal, but the CAN message gets dropped, therefore centre console won't know if the pedal was released.
By default, Centre Console, Front Power Distribution, Pedal Board, will be on. Will this require too much power? Can we save by putting boards into sleep mode? How long until this drains the Aux Battery to a state where it cannot power the boards? 
Heartbeat from BMS Carrier? Who needs to hear this heartbeat? What to do if it's missed? 


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