What is it?
This is the Volkswagen Touareg hybrid. It’s Volkswagen’s first real go at petrol-electric hybrid drive, although it will a while before you can buy a Touareg hybrid. This drivetrain - a 323bhp petrol V6 from Audi and an eight-speed automatic - won’t feature in the current Touareg, but will be launched in the next-generation model, due in 2010.
In the VW Touareg hybrid there’s a 38kw (51bhp) motor powered by a nickel-metal hydride battery pack mounted underneath the boot in the space usually reserved for the spare tyre.
The layout of the VW Touareg hybrid, known as a parallel system, is familiar, having already appeared in a number of hybrids. But by employing a disengagement clutch, the VW Touareg hybrid has overcome one major drawback, namely that the petrol engine and electric motor are always connected.
In some hybrids the crankshaft and pistons within the petrol engine continue to operate even during electric-only propulsion. This adds to wear and also zaps overall efficiency.
The VW Touareg hybrid uses the disengagement clutch to ensure the petrol engine is shut down completely when the electric engine is in use.