Audi used the Paris Motor Show today to introduce a high-efficiency version of its new A4 sedan. Dubbed “concept e,” the vehicle is described as a “near-production study,” meaning a similar vehicle will come to market in the next few months. Delivering 59 mpg, the A4 TDI e will join the 28 mpg A8 FSI e, and the 44 mpg A6 TDI e, both of which are on sale in Europe now.
The powertrain of the Audi A4 TDI concept e uses a direct-injection TDI engine with an output of 120 hp 213.89 pound-feet of torque. It propels the sedan from 0 to 62 mpg in 10.7 seconds, and tops out at 128 mph.
A long list of modifications — from soft springs on the intake valves to a new thermal management system — improves fuel efficiency. Intelligent technologies are used in the engine’s functional environment as well, such as on the fuel pump and on the automatic air conditioning’s compressor.
The recuperation system is another fundamental component for improving fuel efficiency. It recovers power when braking and coasting to a stop, and temporarily stores it in a battery. A start-stop system switches the engine off when the vehicle comes to a standstill. Magnesium was used to reduce the weight of the six-speed transmission, which received an insulating cover for faster warm-up and modified gear ratios.
Audi uses an electromagnetic servo assembly for steering; electrically actuated brakes are fitted at the rear. The 225/45 R17 tires have been optimized for road resistance. Sophisticated fine-tuning measures have improved the aerodynamics of the body. Two types of support are at the driver’s fingertips: he can either call up an economy training program, or have the navigation system calculate the most fuel-efficient route to his destination.
