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Audi RS 5 TDI Concept Previews New 48-Volt Electrical System

Improved 48-volt technology will augment vehicles' traditional 12-volt system.

Erick Ayapana
Aug 25, 2014

Audi RS 5 TDI Concept Details

  • New 48-volt technology to augument traditional 12-volt system.
  • RS 5 TDI concept car powered by a 3.0-liter V6 turbodiesel
  • New system will help improve stop-start technology by providing more ways to control the engine
  • New system will reduce emissions and fuel consumption

The advanced technologies being packed into cars today may improve safety and handling, but they’re also a big strain on a car’s electrical system. This has prompted Audi to come up with an improved “electrification strategy” by employing 48-volt technology to augment a vehicle’s traditional 12-volt system.

Audi RS S TDI concept top view Photo 2/6   |   Audi RS S TDI Concept

Audi is still in the development phase of the new system, which is currently being tested in RS 5 TDI and A6 TDI concept cars. The system currently consists of a compact lithium-ion battery that provides 48 volts and powers a compressor operating independently from the engine, essentially making the drivetrain a mild hybrid. A DC/DC converter integrates the 48- and 12-volt systems.

One interesting advantage of the 48-volt system was previewed in the RS 5 TDI concept car earlier this year. That car is powered by a 3.0-liter V-6 turbodiesel that features a supplemental electrically driven turbocharger to provide spurts of boost while the traditional exhaust-motivated turbochargers are still spooling up.

Audi says the system will also improve stop-start technology by providing more ways to control the engine, while providing power to auxiliary items when the engine is in its off phase. The 48-volt system would also be the main source of energy for all of Audi’s dynamic chassis technologies like Dynamic Roll Control, an advanced suspension system that adjusts damping rates to improve handling. The automaker claims the system reduces emissions and fuel consumption, too, saving a gallon of gas for about every 600 miles.

Source: Audi

Audi RS 5 TDI concept side shot Photo 6/6   |   Audi RS 5 TDI Concept Car
By Erick Ayapana
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