Audi A8 Is First To Use 48-Volt Mild Hybrid Technology

Next Audi A8 to Employ Light Hybrid System
New Audi A8 Will Come Standard With 48-Volt Mild Hybrid Tech

02 June, 2017

In his interview with Autonews, Alexander Kruse, Audi's head of mild hybrid systems, also revealed that the A8 would be able to cast with the engine shut off for up to 45 seconds at speeds of 30km/h to 160km/h (19mph to 99mph). The latter is set to be launched at the Frankfurt auto show in September while the former is still set to debut next year. The system will come on all versions of the A8, and Automotive News says it will improve fuel consumption by 0.7 liters per 100 kilometers in European driving cycles.

Mild-hybrid systems replace the separate starter motor and generator (commonly referred to as an alternator) by a single, powerful motor-generator that can either be belt-driven (in the case of Audi) or integrated with the transmission (in the case of Mercedes).

Renault is offering a 48-volt mild hybrid system on diesel models of its Megane hatchback and Scenic minivan. The system will also feature energy-regenerative brakes, additional acceleration and engine shut-off during coasting, according to a new report in Automotive News. When the driver accelerates again, the alternator/starter revs up the engine to the target speed. It can recharge the battery as the sedan decelerates, allowing the engine to turn off during coasting at 19 to 99 miles per hour for up to 45 seconds, the newspaper says.

In many situations, recovery of energy during deceleration is more efficient than coasting. Already the company has confirmed that by 2020 three new e-tron models and two new Q SUVs will join the lineup.

Audi's Prologue concet-series hints at the styling of the next A8
Audi's Prologue concet-series hints at the styling of the next A8

Kruse also said that Audi's smaller models will not use the 48-volt lithium-ion battery but will instead get a lighter, more conventional battery that provides less torque for shorter periods.

The 48-volt mild hybrid is parts of Audi's strategy to improve fuel economy in its gasoline and diesel engines.

All next-generation Audi A8s will ship the manufacturer's 48V electrical systemThe entire range of the future Audi A8 will at least benefit from a light form of hybridization.

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