VCU Overview

Tasks

On FDCAN1
- Read APPS1 and APPS2 values
- Read BSE
- Read BMS data: max providable power, SoC, SoH, Errors
- Read Inverter data
- Send torque command to inverter
On FDCAN2
- Read wheel speed from DAQ nodes
- Send BMS SoC and other data for DAQ/Dash
  - Error codes go to dash!
- Listen for low priority errors from nodes
APPS Plausibility
- Compare APPS1 and APPS2 values, ensure they dont differ by more than 10% for more than 100ms
- If they do -> error state, request 0 torque from inverter
BSE
- Make sure APPS and Brakes are not activated at same time
  - If so -> error state, request 0 torque from inverter
Torque Calculation
- Use APPS1, APPS2, BMS_MAX_POWER, and wheel speed to calculate how much instantaneous torque is needed. Translate to CAN frame and send to inverter
Safety Checks
- Only activate “connection” between APPS and inverter AFTER ready-to-drive signal is received from RTD circuit.
- Monitor BSPD, IMD safety circuit, and BMS safety circuit for errors
  - If error, shut down all LV connections
    - LV shutdown sequence!
Shut off fans at a certain car speed
Accumulator Relay triggering
Interrupt fault pins for safety devices
12v High for bspd when more thank 5kw power being drawn
Brake pressure sensor 5v