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Audi presents plug-in hybrid TT offroad concept car at Beijing; wireless charging
19 April 2014
|Audi TT offroad concept. Click to enlarge.|
Audi is presenting an Audi TT offroad concept at the Beijing International Automobile Exhibition. Like many of the brand's new production models, the Audi TT offroad concept is also based on the versatile modular transverse matrix (MQB). The TT concept features a plug-in hybrid drive with two electric motors and a system output of 300 kW (408 hp) and 650 N·m (479 lb‑ft) of system torque.
The show car accelerates from 0 to 100 km/h (62 mph) in 5.2 seconds and reaches an electronically governed top speed of 250 km/h (155 mph). Fuel consumption is 1.9 liters per 100 kilometers (123.8 mpg US), a CO2 equivalent of 45 grams per kilometer (72.4 g/mile). The Audi TT offroad concept can drive more than 50 kilometers (31.1 miles) solely on electric power, and has a total range of up to 880 kilometers (546.8 miles).
|Audi TT offroad concept. Click to enlarge.|
The Audi TT offroad concept provides a glimpse of how we might imagine a new model in the future TT family. It combines the sporty genes of the TT with the strengths of a compact Audi SUV. Its plug‑in hybrid drive with the option of inductive charging is a major step toward the mobility of the future. We chose to present the Audi TT offroad concept in China, our second domestic market, because it represents the urban mobility of tomorrow: It is sustainable, dynamic, intelligent and connected.—Prof. Dr. Ulrich Hackenberg, Member of the Board of Management for Technical Development
The combustion engine is a turbocharged 2.0 TFSI unit producing 215 kW (292 hp) and 380 N·m (280 lb‑ft) of torque. At part load, indirect injection supplements gasoline direct injection for lower fuel consumption. (Earlier post.) The exhaust manifold is integrated into the cylinder head—the foundation for the high-performance thermal management system.
|Click to enlarge.|
A separating clutch links the transverse 2.0 TFSI to an electric motor producing 40 kW and 220 N·m (162 lb‑ft) of torque. The slim, disc-shaped electric motor is integrated into the six-speed e‑S tronic. The dual-clutch transmissions sends the torque to the front wheels. Mounted on the rear axle of the Audi TT offroad concept is a second electric motor independent of this drive unit. This produces a maximum of 85 kW and 270 N·m (199 lb‑ft).
In front of the rear axle is a liquid-cooled, 12 kWh lithium-ion battery pack comprising eight modules. It contributes to the balanced 54:46 weight distribution between the front and rear axles and to the low center of gravity. An Audi wall box is used for stationary charging.
|Click to enlarge.|
The show car is also designed for use with Audi Wireless Charging technology for contactless inductive charging. The infrastructure side—a plate with a coil and an inverter (AC/AC converter)—is placed on the parking spot of the Audi TT offroad concept and connected to the power grid. The charging process begins automatically when the car drives onto the plate. The alternating magnetic field of the infrastructure side induces a 3.3 kW alternating current across the air gap in the secondary coil, which is integrated into the vehicle. The current is inverted and fed into the electrical system.
Charging stops automatically when the battery is fully charged. It takes about as long as charging via a cable, and the driver can interrupt the process at any time. The Audi Wireless Charging technology is more than 90% efficient, and is not affected by weather factors such as rain, snow or ice. The alternating field, which is only generated when a car is on the plate, is not harmful for people or animals.
The Audi drive select management system offers three driving modes.
EV mode gives priority to electric driving. In this case, the front drive unit is inactive, and the electric motor at the rear axle with its powerful torque can rapidly accelerate the four‑door car to a maximum of 130 km/h (80.8 mph).
In Hybrid mode, all three drives work together in various ways as necessary. In many situations the front electric motor assumes the role of a generator. Powered by the engine, it recharges the battery and thus extends the electric range.
Full system output is available in Sport mode. During “boosting,” i.e. strong acceleration, the rear electric motor works together with the 2.0 TFSI. The same thing happens when the hybrid management system decides that all‑wheel drive is appropriate. In such situations, e.g. on a slippery road or in light off-road conditions, this essentially makes the Audi TT offroad concept an e‑tron quattro.
When the driver takes his or her foot off the accelerator, free-wheeling or “coasting” is activated. Recuperation occurs here at low speeds and when braking. The driver can use the “Hold” and “Charge” functions in the MMI system to specifically influence the battery’s charge state, e.g. to increase storage of electric energy so that it can be used over the final kilometers to the destination.
Many of the components of the McPherson front suspension are made of aluminum; the four‑link rear axle handles longitudinal and transverse forces separately. The ratio of the progressive steering changes with the steering input. The Audi drive select system allows the driver to modify the function of various technical modules in multiple steps.
Driver assistance systems. The Audi TT offroad concept show car features two Audi driver assistance systems that are almost ready for production: the intersection assistant and online traffic light information technology.
The intersection assistant aims to help to avoid side-impact collisions, or reduce their severity, where lanes merge and at intersections. Radar sensors and a wide-angle video camera scan zones to the front and sides of the car. If the system detects a vehicle approaching from the side and assesses it to be critical, graduated warnings are displayed in the Audi virtual cockpit.
Online traffic light information is a technology that connects the Audi TT offroad concept via the cell phone network to the central traffic computer, which controls the traffic light systems in the city. Based on the information from this system, the Audi virtual cockpit shows the driver what speed to drive in order to reach the next traffic light while it is green. The cockpit displays the time remaining when waiting for the light to turn green.
Body. The body of the show car is based on the ASF (Audi Space Frame) principle and features a hybrid concept with both steel and aluminum components. Together with the battery package of the plug-in hybrid drive system, it gives the compact crossover a low center of gravity, which is a prerequisite for its sporty performance.
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