Saturday, July 30, 2011

VW Concept XL1 (2011)

Future of mobility is one of the most interesting of our time. The key question: How can the energy consumption of cars will be reduced if all stops were removed to be effective? There is now an answer to this question, and Volkswagen is delivered in the form of the new Concept Volkswagen XL1. Combined consumption: 0.9 l/100 km. No other hybrid car powered by an electric motor / combustion engine the most efficient mix of fuel. The prototype made its world debut at the Salon in 2011 in Qatar Motor (26 to 29 January 2011).

Conceptually, the XL1 Volkswagen is the third step in the evolution of Volkswagen's strategy in a liter. When opened the new millennium, Prof. Dr. Ferdinand Piech, now chairman of the Supervisory Board of Volkswagen AG, made the visionary goal of marketing a production car that was practical for everyday use with a consumption of 1.0 liters fuel per 100 km. The new XL1, Volkswagen demonstrates that this goal is within reach.
New Volkswagen XL1 to achieve CO2 emission value of 24 g / km, thanks to a combination of lightweight construction (self-supporting, and add-on components made of carbon fiber), very low coefficient of drag (Cd 0186), and a plug-in hybrid system - consisting of two-cylinder TDI (35 kW / 48 hp) electric motor (20 kW/27 hp), 7-speed dualclutch (DSG) and lithium-ion battery. Results: The fuel consumption of 0.9 liters per 100 kilometers, the new Volkswagen XL1 allows only 24 g / km of CO2. Because it is designed for plug-in hybrid prototype XL1 can run up to 35 kilometers of pure electric mode, ie do not cause emissions in use. The battery can be recharged by conventional electrical outlet at home. Of course, the reform of the battery is also recruited to recover energy while slowing down, and save as much as possible to the battery for reuse. In this case, the electric motor acts as generator.

Despite the high levels of efficiency, developers were able to design a development organization that provides more daily, with side by side seats instead of the tandem arrangement is seen in the first two 1-liter Car made in 2002 and L1 presented in 2009. The new Volkswagen XL1 produces wing doors make it easier to enter and exit the car. Further progress is made by body parts carbon fiber reinforced polymer pieces (CFRP), a technique used in the automotive Formula 1. Once again, Volkswagen has managed to achieve significant reductions in production costs - an important step to return a limited production run XL1. Background: collaboration with suppliers, Volkswagen has developed and patented a new system for the production of carbon fiber in this process is known as ARTM (Advanced Resin Transfer Moulding).

Plug-in hybrid concept

With the new XL1 Volkswagen is implementing a concept plug-in hybrids are more fuel-efficient technologies in the common rail turbodiesel engine (TDI) and dual-clutch transmission (DSG). TDI produces its maximum effect at 35 kW/48 hp 0.8-liter engine only. The set is housed hybrid above the rear axle car driving. The real hybrid module with an electric motor and the clutch is placed between TDI and 7-speed DSG, this module is integrated into the DSG gearbox, instead of the usual wheel. The lithium-ion battery provides E-motor with energy. The flow of energy at high voltage and the battery or the E-motor controlled by power electronics that operate at 220 volts. Volkswagen XL1 body electrical system is supplied with the necessary 12 volts via a DC / DC converter.

E-motor Interaction and TDI: The electric motor is accelerating TDI (stimulant), but as described can also feed the XL1 concept itself for a distance of 35 km. In this mode, the TDI is decoupled from the driveline to disengage the clutch, and closes. Meanwhile, the clutch on the side of the gearbox is kept closed, so the DSG is fully committed to the electric motor. Important: The driver can choose to drive the Volkswagen XL1 in pure electric mode (if the battery is charged). Once the mode button on the electrical panel is pressed, the car is powered solely by electricity. Restarting the IDA is a very soft and comfortable: In what is known as "pulse start" while driving TDI engine, the rotor of the electric motor accelerates, and is coupled to the clutch motor. This speeds up the TDI at the required speed and starts.

The entire process takes place without any shocks, so that the driver hardly notices the TDI engine restart.

When the XL1 is braked, the electric motor acts as a generator that uses the energy of braking to recharge the battery (renewal). In certain operating conditions, the load is divided in the TDI engine and an electric motor can be moved so that the diesel has the lowest efficiency. Fishing gear is automatically transferred to 7-speed DSG is also always be chosen to minimize power consumption. The motor controller regulates the flow of all energy and disk management tasks, taking into account the power demand at any time by the pilot. Some of the parameters used to implement the state power to provide optimal conditions are: accelerator pedal position and engine load as well as energy supply and mix of commercial energy and electricity at any given time.

The two-cylinder TDI used in the mass production of technology: 0.8-liter TDI (35 kW/48 hp) came from the 1.6-liter TDI, which is to drive cars like the Golf and Passat. 0.8 TDI has the same information as the 1.6-liter TDI common-rail distance between the cylinders (88 mm) diameter cylinder (79.5 mm) and stroke (80.5 mm). In addition, the concept of a twin-cylinder Volkswagen XL1 and mass-produced four-cylinder engine uses an internal action to reduce emissions. They are particularly piston recesses multiple injections and single injection in the direction of individual projects. Excellent, good engines, common-rail operation was moved to a two-cylinder engine. In addition to the balance within the room that controls the speed of rotation of the engine, while optimizing the engine is running smooth.

Meanwhile, the aluminum of the TDI was built for rigidity and accuracy, which in turn leads to very low friction loss. With the aim of reducing emissions, recycling of exhaust gases and an oxidation catalyst and diesel particulate filter is used. Equipped in this way, the 0.8 TDI already complies with the limits of the Euro-6 emissions standard.

Designed for the efficiency of the cooling system of the car. Control only by activating the TDI engine externally cooled electric pump when the engine operating conditions so require. This includes the cooling system is automatically controlled air intake system for the front of the cooling system of the vehicle to reduce drag. This thermal management strategy will also help reduce fuel consumption. Another electric water pump, which is used only when necessary, around the bottom loop to cool the temperature of the coolant starter generator and power electronics.

CFRP body is a technical masterpiece

The development team made extraordinary progress in the design of the CFRP body - in the form of its lightweight construction and aerodynamics. A comparison with the Gulf illustrates how innovative body concept for the new XL1 is.

The drag coefficient of the Gulf of success is very good for the compact segment: CD (0312) x (2.22 m2 frontal area) is equal to a total of 0693 m2 trawl (Cd.A) offer this references benchmark car in its class aerodynamics. Meanwhile, Volkswagen XL1 overcomes this performance with a 0186 value of CD and frontal area of ​​1.50 m2. The product of these two parameters gives a total drag, or the value of 0277 m2 Cd.A which is 2.5 times less than the Golf.

Designing a new era is 3888 VW XL1 mm long, 1665 mm wide and only 1,156 mm high. These are extreme dimensions. The Polo has a similar length (3970 mm) and width (1682 m), but it is much higher (1462 mm). The height of the new XL1 is approximately the same as a Lamborghini Gallardo Spyder (1184 mm). So it is easy to see how such a wonderful Volkswagen seems on the road - long and wide as a polo, but with a lower profile than a Lamborghini.

The wing doors for the new Volkswagen XL1 is also reminiscent of a sports car luxury. They consist of two points: making the A-pillars and windshield just above the roof structure, not just appear, but slightly forward as well. The doors also extends far into the roof. Once opened, they release an abnormally high amount of input and output space.

Visually, the new XL1 also adopts a style of lines L1 introduced in 2009, but the new prototype has a more dynamic, thanks to its greater width. The design of the whole body was subjected to uncompromising laws of aerodynamics. Opposite, with VW XL1 concept of the greater width of the car, then shrinks back. Seen from above, resembles the type of XL1, a dolphin, especially at the back where the lines optimally in accordance with the airflow over the vehicle body to reduce the air resistance of Volkswagen.
In side profile, reflecting the style of roof lines that trace an arc of a pillar back to the rear. The rear wheels are fully covered to avoid air turbulence, air flows here are optimized for small spoilers front and rear wheels. Observers will look for Mirror vain; replace the wing doors are small cameras that take on the role of mirrors that transmit digital images of the environment behind the car for two screens inside the vehicle.

The front of the new Volkswagen Concept XL1 does not exhibit the typical radiator grille, but reflects the current style of 'design DNA' Volkswagen, of which most of the horizontal line. In particular, a black cross-track (an area where no grid), which combines energy-efficient dual-LED lights form a continuous band. The air intake for cooling the actual design of the TDI engine, battery and interior is in the lower front section and an electronic control of the Louvre. Sideindicators Strait is also designed for LED technology, these are the bow "L" shaped wheel vertical and the horizontal line under the headlights. This will create a front-end, which - although it has been completely renovated, and its extreme dimensions - can be immediately recognized in the design of Volkswagen's clean lines.