Audi 2011 Annual Report Download - page 176

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173
Management Report
134 Audi Group
143 Business and underlying
situation
159 Financial performance
indicators
162 Social and ecological aspects
162 Employees
166 Audi in society
167 Location-based
environmental aspects
170 Product-based
environmental aspects
175 Risks, opportunities
and outlook
187 Disclaimer
The “efficiency” mode of the Audi drive select driving dynamics system first appeared on the
successor generation of the Audi A6 in 2011, alongside the existing options “comfort,” “auto”
and “dynamic.” The new driving mode promotes an enhanced-efficiency form of operation that
brings together the individual vehicle systems such as engine, transmission, suspension and air
conditioning. The net effect is an efficiency gain of up to 10 percent.
Cylinder on demand
Cylinder on demand technology in the new 4.0 TFSI engine also helps to deliver further efficiency
gains. At part loads, the high-performance eight-cylinder engine deactivates four of its cylinders.
This makes the remaining cylinders operate with improved efficiency, boosting fuel economy.
Above all thanks to cylinder management, the fuel efficiency of the new Audi S6 has been im-
proved by around 25 percent compared with the previous model. The transition between the two
modes goes unnoticed by the customer. For example, active noise control (ANC) detects noise
interference inside the car by means of microphones built into the headlining and generates an
equivalent noise via the sound system to cancel it out. In addition, active engine mounts reduce
potential vibration to an imperceptible level by means of out-of-phase counter-oscillations.
The new 4.0 TFSI engine with cylinder on demand will appear in the S6, S6 Avant, S7 Sportback
and S8 models available from summer 2012.
CYLINDER ON DEMAND TECHNOLOGY IN THE NEW AUDI S8
Stop at traffic lights Constant-speed drivingAcceleration
Speed
Innovative thermal management
A cold start at low temperatures entails significant efficiency losses because more energy input
is needed to circulate the cold, highly viscous oil in the engine, differential and transmission.
Another technology added to the modular efficiency platform in the past fiscal year is an advanced
form of innovative thermal management, which shortens the warming-up phase when there is
increased internal friction, thus improving fuel efficiency and reducing CO₂ emissions.
It achieves this by distributing the heat flows between the engine, transmission and interior intel-
ligently so that the drive assemblies reach their operating temperature sooner after a cold start.