9.2   Audi

• 300 Duo: In 1989 Audi produced an experimental vehicle. A 12.6 hp (9.4 kW) electric motor drove the rear wheels and a 2.3 litre five-cylinder engine, with an output of 136 hp (101.5 kW), drove the front wheels.
  
  
• 80 Duo: The Audi 80 Duo was produced in 1994. Information required.
  
  
• A4 Duo: In  1997 Audi became the first European manufacturer to mass-produce a hybrid car. How many produced and up to when?
  
  
• The front wheel drive Audi duo was based on the A4 Avant and was powered by a 90 hp (67 kW) 1.9-litre TDI engine and a 29 hp (21.6 kW) electric motor.  Note: 1kW = hp x 0.746
  
  
• The electrical motor powered by a lead-gel battery.
  
  
• Q7 Concept: In 2005 Audi announced a hybrid Q7 concept vehicle to be powered by a petrol engine or, up to 29 kph (18 mph) by an electric motor, or both.
  
  
• When stationary for more than three seconds the petrol engine automatically switched off (restarting when the accelerator was depressed).
  
  
• The electric motor was powered by a nickel-metal hydride (NiMH) battery.
  
  
• Compared to a conventional Audi Q7, a fuel consumption saving of about 13 percent was projected.
  
  
• Solar cells powered the air-conditioning system when the vehicle was parked.