2.2 System architecture
BMG
Scotty AI
48V Lithium Bank
Master Controller Reads from any Lithium Bank: CAN if available, Voltage otherwise Has wire-in stop charge
Max 58V Min 40V
Reads from BMG RPM, Motor temp and Inverter temp Sets Power limit calculated using AI of the max power the connected engine can deliver at the current RPM Adjust Max Power based on Inverter temperature and motor temperature. Sends Power instruction to BMG of Voltage Setpoint and Current Setpoint to charge Lithium Bank that is within the Power Limit Calculated above.
RPM Torque Temperature Power
Voltage Current
• The inverter integrates a control unit and communicates with Scotty AI via a dedicated CAN port. This CAN communication is kept separate from other CAN communication lines. • The BMG is attached to the engine directly or via a bracket and connected to the engine crankshaft pulley vie serpentine belt. The BMG integrates 48V positive and negative terminals (B+/B − ), connects to the positive and negative terminals of the 48V battery. Other 48V loads can be connected on the battery side and supply power directly. • Some battery packs may require a pre-charge function to avoid damage to the components caused by the voltage shock during the 48V power-on process. • The 48V circuit also connects to Scotty AI either on the BMG side or the battery side. Scotty AI then delivers 12V or 24V through the integrated DC DC. • BMG microprocessor and the motor field control needs to be connected to a 12V supply. DO NOT CONNECT 48V or 24V to the KL15 or KL30 terminals. 12V ONLY.
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