Abstract
We present the relative benefits of mild electrification (12V and 48V systems) across a spectrum of vehicles ranging from small cars to full-size trucks/SUVs. A convenient way to think about electrification systems is in terms of the maximum power capability of such systems. Assuming a maximum current in the range of 350 to 400 Amps suggests a power range of interest between 4 kW (12V systems) and 20 kW (48V systems) for this study. We explored various propulsion architectures with a single motor/generator unit (MGU). We found that the fuel economy benefit increases linearly with battery power and then starts to roll off (diminishing returns). Identifying this roll off point and its correlation with vehicle mass helps to size the electrical system power. We also swept the MGU-to-driveline attachment point to identify the optimal location for best efficiency. Based on the general trends we have identified and presented, one may determine the optimal power level, electrification voltage level, and MGU attachment point location suitable for specific vehicle applications.