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The Saab 9-3 BioPower Hybrid Concept is just as easy to drive as its petrol or diesel powered siblings. Energy use and power distribution is fully automatic. The only visible differences from a conventional car are a few instruments and the Zero Mode switch. Despite its compact design, the Saab BioPower Hybrid has the capacity to be driven entirely on the stored electricity.
1. Saab BioPower 2.0 Turbo – combustion engine optimised to run on pure bioethanol (E100), resulting in zero fossil fuel emission.
2. Electric Continuously Variable Transmission (ECVT) - with two planetary gear sets and two integrated 55 kW (75 bhp) electrical motors/alternators.
3. Rear Drive Unit (RDU) - transmission differential with an integrated 38 kW (55 bhp) electric motor/alternator.
4. Battery Management System (BMS) – Electronic Control Unit with software for battery supervision.
5. Control unit - monitoring the the electric power distribution to and from the ECVT.
6. 300 V battery – powers the hybrid system. Compact, high-capacity lithium-ion battery.
7. Electronic Control Unit – for the Rear Drive Unit (RDU).
8. Zero Mode button – switch between Hybrid and Zero Mode. Driving range in fully electric Zero Mode is 10–20 km depending on driving conditions.
Battery capacity and charging is monitored and governed by an electronic control unit. It optimises energy flow by charging the batteries during braking or whenever needed. It also controls the operation of the electric motors to achieve as little use of the combustion engine as possible.
During acceleration, the electric motors are activated to further boost the power of the turbo engine. At take-off the huge instant torque of the electric motors helps to deliver tripled torque from tick-over to about 1500 rpm.
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