Motortrades Insight Magazine Online
Geneva 2013: The Production-Ready Volkswagen XL1
Volkswagen will be showcasing its XL1 Super Efficient Vehicle at the Geneva Motor Show this week.The most fuel-efficient production car in the world, with a fuel consumption value of 0.9 l/100 km (approximately 313mpg), will go into production at the company's Osnabrueck factory in Germany.
Thanks to its plug-in hybrid system, the two-seater can also cover a distance of up to 50 km in all-electric mode and therefore with zero local emissions.
Pioneering construction techniques, an advanced plug-in hybrid drivetrain and innovative packaging all play a part in allowing the XL1 to return 313mpg on the combined cycle while emitting 24g/km of CO2 to set a new benchmark for vehicle efficiency.
Powering the XL1 is a compact 800cc TDI two-cylinder common rail diesel engine.
The TDI engine is linked to an electric motor and a seven-speed DSG gearbox with an automatic clutch mounted between each unit. The electric motor can either work independently of the TDI engine or in tandem when accelerating. In pure electric mode the XL1 can travel up to 35km before the diesel engine cuts in. Accelerating from rest to 62mph can be achieved in 11.9 seconds, with an electronically limited top speed of 99mph.
In both its styling and packaging the XL1 draws on lessons learned from the 1-Litre car (2002) and the L1 concept (2009). The XL1 has evolved to feature staggered seating with the driver and passenger placed next to each other in a body structure made from advanced new materials providing immense strength yet weighing just 230kg.
To make such weight savings possible, and yet viable for series production, Volkswagen developed and patented a new system for the manufacture of the Carbon Fibre Reinforced Polymer (CFRP) parts on the car called the Resin Transfer Moulding (RTM) process.
In total, the XL1 weighs 795kg. In addition to the body structure, the weight is accounted for by the drivetrain (227kg), the running gear (153kg), the interior including a pair of bucket seats (80kg) and the electrical system (105kg). In total just 23.2 per cent of the car (184kg) is made out of either steel or iron.
Further savings are made through the extensive use of lightweight materials including magnesium (wheels), ceramics (brake discs) and aluminium (dampers, steering system, brake calipers).
The styling of the XL1 is borne out of functional requirements according to Volkswagen - easy access to the interior is granted via a pair of elegant scissor doors that hinge on the A-pillar while the profile of the car has been honed in the wind tunnel, the result being a remarkable coefficient of drag figure of 0.186. The XL1's overall length (3,970mm) and width (1,682mm) are similar to those of a Volkswagen Polo yet its height (1,184mm) is more akin to that of a Lamborghini Gallardo Spyder.
Although the XL1 is still very much a concept, Volkswagen says its unveiling marks the next step towards the birth of a new class of Super Efficient Vehicles, while the advent of a process such as RTM is a significant milestone.
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