2008 Audi Q7 SUV Hybrid
Audi aims to launch its Q7 SUV hybrid, which was developed in a partnership with Porsche, by 2008.
The Audi Q7 hybrid concept study is equipped with a 4.2-litre FSI V8 drive unit developing 257 kW (350 bhp) and 440 Newton metres of torque. An electric motor that has also been integrated into the driveline adds up to an extra 200 Nm of torque. The study is making its debut at the 2005 International Motor Show in Frankfurt.
The performance figures promised by the Audi Q7 hybrid give it sports car status: a mere 6.8 seconds are required to reach 100 km/h from standstill. In-gear pulling power is even more electrifying, with the SUV accelerating from 80 up to
120 km/h in 5th gear in 7 seconds flat. These compelling figures are made even more impressive by the fact that the Q7 hybrid tips the scales at 2,410 kilograms and returns fuel consumption figures of just 12.0 litres per 100 kilometres, nearly 13 percent less than the standard-production model: what better testimony to the efficiency of the Audi hybrid drive system?
The V8 under the bonnet of the Q7 hybrid incorporates the same FSI direct-injection petrol technology featured in the RS 4 engine. This marks the first ever use in a series-production eight-cylinder engine of a technology which has powered the Audi R8 Le Mans racing car to five victories. FSI engines are more powerful and dynamic than conventional indirect-injection units whilst at the same time being a model of fuel economy. The V8 engine was retuned prior to being fitted in the Audi Q7. The new engine's credentials now include beefy torque delivery right up to the red line as well as agile responsiveness, all combined with economical running.
The electric motor is capable of far more than just providing auxiliary power though, as it also regenerates the kinetic energy produced by braking or driving downhill in overrun mode and feeds it back into the system to recharge the battery.
During this "recuperation" phase, the unit switches its function in a fraction of a second to act as a generator, without the driver noticing the slightest change.
An additional function for streamlining the new drive system's efficiency is just as imperceptible to the driver. If the vehicle is coasting without the accelerator pedal depressed, the combustion engine is switched off. The same fuel-saving measure is initiated whenever the vehicle is stationary for over three seconds. All the driver has to do to resume the journey is release the brake pedal and depress the accelerator and the petrol engine will immediately spring back into action.
Thanks to these strategies deployed by its intelligent energy management, the drive system boasts a high degree of efficiency. Despite its far superior acceleration, an identical top speed and the increase in vehicle weight, the Q7 hybrid burns around 13 percent less fuel than a comparable standard-production model fitted with a combustion engine only. Average fuel consumption in the MVEG cycle is 12.0 litres per 100 km. When driving purely in city traffic, where frequent energy recuperation makes even greater reductions possible, the hybrid vehicle's fuel-saving potential can be harnessed to yet greater effect.
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