System Architecture
The Nissan Leaf EV powertrain model is organized around the high-voltage battery pack, DC link, three-phase inverter, electric traction motor, vehicle body block, tire/load dynamics and driver command. The simulation can be extended with speed reference profiles, road-gradient changes, regenerative braking, motor efficiency maps and battery SOC limits.
- Battery subsystem representing voltage, current, SOC and available energy.
- Power converter stage connecting the battery/DC link to the traction motor.
- Motor-drive controller for torque command, speed regulation and transient response.
- Vehicle dynamics block for acceleration, wheel speed, load torque and speed tracking.
Research Methodology
The project methodology starts with a baseline EV powertrain and then evaluates acceleration, cruising, braking and load-change conditions. Important signals are measured using scopes and workspace outputs so the thesis chapter can compare battery loading, motor torque, speed tracking and energy consumption under different drive cases.
Simulation Cases for Validation
- Initial acceleration from rest to rated vehicle speed.
- Sudden torque demand or speed-reference variation.
- Battery SOC variation under repeated drive intervals.
- Regenerative braking case with negative motor torque and charging current.
- Road-load or gradient disturbance to verify controller robustness.
Expected Graphs and Result Discussion
A complete result section should include vehicle speed, motor speed, electromagnetic torque, battery SOC, battery current, DC-link voltage, inverter output and energy-flow comparison. The discussion must explain why battery current rises during acceleration, how motor torque settles after the transient, and how regenerative braking improves energy recovery.
Thesis and Research Extension Ideas
This EV powertrain model can be upgraded with fuzzy logic, ANN, MPC, PSO tuning, thermal battery limits, adaptive energy management, different drive cycles and comparison with hybrid energy storage. These extensions make the topic useful for PhD research scholars, MTech students and engineering thesis writing support across Australia, UK, Canada and UAE.