Audi adds the start-stop and the efficiency
To its fuel saving and emissions reduction measures
status indicated in the central display of the A5.
Accompanying the general automotive efforts to lower
fuel consumption and CO2 emissions, German luxury carmaker Audi
will add new technologies to its modular efficiency platform within the
remaining weeks of this quarter.
Audi says that with the help of the on-board computer,
the efficiency program and the start-stop system, the efficiency and
convenience of its models should be raised to a new level, on the way to
the target of lowering the fuel consumption of its model range within the
next three years by 20 percent, compared with the 2007 level.
system can be switched off by pressing a button.
Audi’s modular efficiency platform is a set of
approaches combined to reduce consumption without affecting driveability
and sporty qualities.
Most directly, Audi is adding now two efficiency
technologies: the start-stop system and the on-board computer
with efficiency program. They both complement the energy recovery
system, which already belongs to the standard specification of many Audi
models and feeds energy back into the vehicle’s electrical system during
The start-stop system realizes its efficiency potential
especially in urban traffic. It shuts down the engine once the car has
come to a stop, the gear lever stands at idle and the driver releases the
clutch pedal. Operating the clutch starts up the engine and brings it to
its normal idle speed while the driver is still shifting gears.
system in the Audi
A4 and other models.
To maintain functioning even at low temperatures, Audi
combines the start-stop system with efficient battery technology and
advanced energy management. During the warm-up phase, the start-stop
system remains inactive until the engine oil becomes warmer and the
exhaust gas cleaning systems reach their operating temperature faster. The
driver can also switch off the start-stop system at any time by pressing a
Audi says that in the standardized driving cycle, the
start-stop system lowers fuel consumption by about 0.2 litre per 100 km,
and therefore reduces CO2 emissions by around 5 g/km. The new
system is being used for the first time in the Audi A3 1.4 TFSI with
manual transmission and in the Audi A4 and A5
with two-litre engines and manual gearshift. Other models will
follow this year.
From a parallel angle, the on-board computer with the
efficiency program is an addition to the Audi Driver Information System.
All consumption-related data appear in the centre display, with
recommendations for efficient driving, since up to 30 percent of fuel
consumption depends on the individual driving style.
The efficiency program continuously analyzes the energy
consumption in the vehicle and gives the driver up-to-date tips for saving
fuel, depending on the driving situation and driving style.
The newly designed gearshift indicator signals to the
driver when to shift, for optimal fuel economy: A large and colour-coded
display indicates whether the right gear is engaged, or whether shifting
would be practical for the sake of efficiency.
As comfort features like air conditioning and seat
heating also increase fuel consumption, a specially developed display in
the efficiency program identifies the systems requiring extra energy and
indicates their share from the fuel being consumed.
The energy recovery system already uses deceleration
phases to convert kinetic energy (resulting from motion) into electrical
one. When the car accelerates again, the battery directs the temporarily
stored energy back into the vehicle, to relieve the alternator and thereby
contribute to saving fuel.
The energy recovery system is already standard
equipment on the Audi A3 1.4 TFSI with manual transmission, the Audi A4,
A5 Coupé and A5 Cabriolet with two-litre engine and manual transmission,
the A6 and the Audi Q5 and Q7.
Globally, the modular efficiency platform focuses on
the continuous development of powertrain and transmission technologies,
and the recovery and storage of mechanical, thermal and electrical energy,
in parallel with other measures to minimize driving resistance and
optimize aerodynamics. These elements are already part of the standard
specification of current Audi models featuring efficiency technologies
such as the Audi valvelift system, high-efficiency transmission and tires
with optimized rolling resistance.