Audi has revealed more details of the 48-volt electrical system seen in the RS 5 TDI concept. Twelve-volt systems can struggle with the demands of modern technology and are not suited to running devices such as the electric compressor fitted to the concept car.
Adopting additional, high-voltage circuitry is also claimed to permit weight saving within the vehicle wiring harness. Electrical power is generated by a new alternator that operates as part of a mild hybrid drive system. Conventional alternators can deliver up to three kilowatts but the new type is said to generate 10 kilowatts. When the engine isn't running, a lithium-ion battery acts as the energy source and a DC/DC converter integrates the 12-volt electrics. Audi claims that the new electrical system cuts fuel use by 0.4 litres per 100km and saves 10g/km in CO2 emissions on the concept - in conjunction with a system to shut down the diesel engine when it is not needed.
Anything else?
Audi has plans for other systems to take advantage of the 48-volt system. Future applications include dynamic chassis control and new convenience systems. A scalable platform concept for the technology has been created by the group's developers and more applications will be announced soon.