2011 Volkswagen Sports Cars XL1 (SEV)

The latest Volkswagen will unveil the 3rd and latest iteration by itsroadster diesel-electric hybrid concept serial, the fresh XL1 Super effective Vehicle (SEV) at these week’s Qatar Motor demo, which runs by January 26 to 29. The latest 2011 Volkswagen XL1 Hybrid Conceptare motivated by a diminished 800 cc TDI two-cylinder basic rail diesel engine breaking 48 HP.

Vision becomes reality – Volkswagen’s “Formula XL1”:  Volkswagen XL1 prototype consumes just 0.9 l/100 km! Wolfsburg / Doha, 25 January 2011 - Future mobility is one of the most stimulating topics of our time. The key question here: Just how much could the energy consumption of cars be reduced if all the stops were pulled out for efficiency? There is now an answer to this question, and Volkswagen is delivering it in the form of the new XL1. Combined fuel consumption: 0.9 l/100 km. No otherhybrid car powered by an electric motor / internal combustion engine combination is more fuel efficient.

Volkswagen will build small run of XL1 plug-in hybrid in two years. “We want to go into series production with this car starting in 2013,” Volkswagen chairman Ferdinand Piech told Automotive News Europe on Tuesday at an event in Doha, Qatar, ahead of the 2011 Qatar auto show where Volkswagen unveiled an XL1 prototype. Pioneering construction techniques, an advanced plug-in hybrid drivetrain and innovative packaging all play a part in allowing the new Volkswagen XL1 Super Efficient Vehicle (SEV) to return 260 mpg on the combined cycle to set a new benchmark for vehicle efficiency.

The most efficient car in the world. The new 2011 Volkswagen Sports Cars XL1 (SEV) Roadster Diesel-Electric Hybrid Concept shows the way forward for extreme economy vehicles and clean technologies. It also demonstrates that such cars can also be fun.  The feeling when driving the XL1 is truly dynamic - not based on pure power, rather on its pure efficiency. Two examples: 1) To travel at a constant speed of 100 km/h, the prototype only needs 6.2 kW/8.4 PS – a fraction of the performance of today’s cars (Golf 1.6 TDI with 77 kW and 7-speed DSG: 13.2 kW/17.9 PS). 2) In electric mode, the XL1 needs less than 0.1 kWh (82 Wh/km) to complete a one kilometre driving course. These are record values.

Powering the 2011 Volkswagen Sports Cars XL1 (SEV) Roadster Diesel-Electric Hybrid Concept is a compact 800 cc TDI two-cylinder common rail diesel engine developing 47 hp. It's linked to an electric motor producing 27 hp, resulting in a total of 74 hp - a modest output yet more than enough when the low kerb weight of 1753 lbs (795 kg) of the vehicle is taken into account. Two-cylinder TDI uses mass production technology: The 0.8 litre TDI (35 kW/48 PS) was derived from the 1.6 litre TDI, which drives such cars as the Golf and Passat. The 0.8 TDI exhibits the same data as the 1.6-litre TDI common rail engine in terms of cylinder spacing (88 mm), cylinder bore (79.5 mm) and stroke (80.5 mm).

In addition, the Volkswagen XL1 Concept's two-cylinder and the mass produced four cylinder share key internal engine features for reducing emissions. They include special piston recesses for multiple injection and individual orientation of the individual injection jets. The excellent, smooth running properties of the common rail engines were transferred to the two cylinder engine. within addition, a balancer shaft that is driven by the crankshaft turning at the same speed optimises smooth engine running.

When the full power of the hybrid system is engaged, the Volkswagen prototype accelerates from 0 to 100 km/h in just 11.9 seconds; its top speed is 160 km/h (electronically limited). Yet these numbers alone do not tell the whole story: Since the XL1 weighs just 795 kg, the drive system has an easy job of propelling the car. When full power is needed, the electric motor, which can deliver 100 Newton metres of torque from a standstill, works as a booster to support the TDI engine (120 Newton metres torque). Together, the TDI and E-motor deliver a maximum torque of 140 Newton metres in boosting mode.

Carbon fibre reinforced polymer (CFRP) the ideal material for the body of the new 2011 Volkswagen Sports Cars XL1 (SEV) Roadster Diesel-Electric Hybrid Concept because of its light weight. The 2011 Volkswagen Sports Cars XL1 (SEV) Roadster Diesel-Electric Hybrid Conceptweighs only 795 kg. Of this figure, 227 kg represents the entire drive unit, 153 kg the running gear, 80 kg the equipment (including the two bucket seats) and 105 kg the electrical system.

That leaves 230 kg, which is precisely the weight of the body - produced largely of CFRP - including wing doors, front windscreen in thin-glass technology as in motorsport and the highly safe monocoque. A total of 21.3 percent of the new Volkswagen XL1, or 169 kg, consists of CFRP. In addition, Volkswagen uses lightweight metals for 22.5 percent of all parts (179 kg). Only 23.2 percent (184 kg) of the new XL1 is constructed from steel and iron materials. The rest of its weight is distributed among various other polymers (e.g. polycarbonate side windows), metals, natural fibres, process materials and electronics.

 

Design for a new era: The VW XL1 is 3,888 mm long, 1,665 mm wide and just 1,156 mm tall. These are extreme dimensions. The Polo has a similar length (3,970 mm) and width (1,682 m), but it is significantly taller (1,462 mm). The height of the new 2011 Volkswagen Sports Cars XL1 (SEV) Roadster Diesel-Electric Hybrid Concept is about the same as that of a Lamborghini Gallardo Spyder (1,184 mm). So, it is easy to visualise just how spectacular such a Volkswagen would appear on the road – as long and wide as a Polo, but with a low profile like a Lamborghini.

The styling of the 2011 Volkswagen Sports Cars XL1 (SEV) Roadster Diesel-Electric Hybrid Concept is borne out of functional requirements - 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 and width are similar to those of a Volkswagen Polo yet its height is more akin to that of a Lamborghini Gallardo Spyder.

Although the 2011 Volkswagen Sports Cars XL1 (SEV) Roadster Diesel-Electric Hybrid is still very much a concept, 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