Case Studies and White Paper.

Case Study: 48v eSupercharger

Designed for use with a 48V vehicle architecture the eSupercharger is intended to supplement boost pressure during spool up time of a mechanical Turbo charger.

Optimized from the ground up to reduce shaft inertia, it comprises of a permanent magnet 70krpm rotor driving a centrifugal wheel with response times of a fraction of a second.

The unit has a peak power of 6.2kW, water-cooled and with integrated drive electronics.

Testing and Evaluation

Testing was conducted on a BMW 520I 2.0l gasoline 135kW vehicle. With the intention to supplement the boost air at low engine revs. The diagram shows the set up and the control logic for the evaluation.

The graph below shows the aim of the e-supercharger to supplement the engine torque during the spool up of the turbocharger.

Providing up to an additional 55Nm. The benefit of this was testing using so called 'shooting manoeuvres'.

On a rolling road the vehicle would change speed whilst in a single gear. This is to replicate maneuvers such as changing lane to overtake on a highway.

Results and Conclusions

The results show a significant reduction in time when the e-supercharger is used with up to 4.1 seconds taken of the time to accelerate from 70 to 130km/h in 4^th gear. This demonstrates the e-supercharges capability to increase the response time of the vehicle and enhance drivability of a smaller capacity engine with higher efficiency.