SCUSupervisory Control Unit
The central controller that arbitrates torque, energy, charging and safety strategy across an electrified platform.
Standards
- Developed against ISO 26262 for safety-critical control
- UDS on CAN diagnostics
- ECE R10 EMC design basis
System overview
The ATI SCU sits above the individual subsystems and turns their requests into one coherent vehicle behaviour. It receives state from the BMS, ESC, EHB, EPS, ADAS and the powertrain, then executes torque, energy, charging, safety and range strategies against the vehicle-level objective rather than any single subsystem objective. In REV applications it also owns the range-extender policy, starting and stopping the generator against SOC and load so the battery stays inside its target window. Fault handling, limp-home behaviour and DTC reporting are centralised here, which is what lets a single ATI platform behave predictably when several interventions arrive at once.
Vehicle-level arbitration across braking, steering, ADAS and powertrain requests
Power limiting driven by live SOC, SOH, voltage, current and temperature from the BMS
Range-extender start/stop policy that holds SOC inside a target window
Centralised fault detection, limp-home entry and DTC reporting over CAN
Technical profile
Capabilities and technical values are program-dependent and must be confirmed against the applicable OEM requirements, vehicle architecture and validation plan.
Problems it solves
- Motor torque and speed management from pedal demand, drive mode and stability state
- HV pre-charge, contactor and interlock control coordinated with a DC charger or OBC
- Energy strategy for regenerative braking blended with the EHB
Typical applications
- Battery electric passenger vehicles
- Hybrid and range-extended platforms
- Light commercial and fleet EVs
Technical profile
- Role
- Central motion and energy supervisor
- Interfaces
- BMS, ESC, EHB, EPS, ADAS, inverter, charger
- Communication
- CAN / CAN FD with UDS diagnostics
- HV control
- Pre-charge, contactors, interlock monitoring
- Safe state
- Limp-home with DTC storage and CAN reporting
- Platforms
- BEV, HEV, REV
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