Audi goes green with new hybrid
The Audi Q7 hybrid concept was launched with the Q7 production models at the Frankfurt Motor.
This concept is equipped with a 4.2-litre FSI V8 drive unit developing 257 kW at 6 800 r/min and 440 Nm metres of torque at 3 500 r/min.
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.
Power is directed to the wheels through a 6-speed tiptronic transmission.
The Q7 hybrid goes from 0-100 km/h in 6.8 seconds, with the SUV accelerating from 80 up to 120 km/h in 5th gear in 7 seconds flat.
Audi claims that the Q7 hybrid 's fuel consumption is 12 litres per 100 km, which is about 13% percent less than the standard-production model.
The V8 engine is taken from the latest Audi V-engine range. A distinguishing feature is the chain-driven camshaft.
Unlike the conventionally powered models, the auxiliary air conditioning compressor and power steering pump units in the Q7 hybrid are powered electrically to ensure their continued operability when the vehicle is driving in pure electric mode.
The V8 under the bonnet of the Q7 hybrid incorporates the same FSI direct-injection petrol technology featured in the RS4 engine.
The electric motor draws its energy from a battery system housed beneath the luggage compartment floor at the rear of the vehicle.
A voltage transducer that supplies power to the vehicle's electrical system can also be found here.
There are basically three different operating states: either the vehicle is driven by the combustion engine or electric motor alone, or the two power sources unite together to accelerate the vehicle.
The petrol engine is responsible for basic vehicle operation, although it also energises the battery at the same time.
The electric motor, meanwhile, is capable of propelling the vehicle at speeds of up to 30 km/h, autonomously and in virtual silence, which comes in particularly handy when driving in city traffic.
The battery's charge capacity allows for a range of up to two kilometres in pure electric mode, with the extra energy produced during braking and engine overrunning being fed back into the system.
Once the battery's capacity has dropped to minimum, the combustion engine cuts in imperceptibly to recharge it.