Audi `green` issues and sustainability

Audi ‘green’ issues
and sustainability
Saving fuel and reducing emissions – start-stop on A3, A4 and A5.
Manual versions of the A3 and A3 Sportback 1.4 TFSI, 1.6 TDI and
2.0 TDI 140PS, A4 Saloon and Avant, A5 Coupé (pictured right),
Sportback and Cabriolet models powered by the 1.8 TFSI (except
Sportback), 2.0 TFSI and 2.0 TDI engines now return even better
economy and lower CO2 emissions with start-stop and recuperation.
How it works: start-stop
The Audi start-stop system uses state-of-the-art technology to
deliver real world benefits without any need to change driving style.
It works as follows:
• When a start-stop-equipped vehicle comes to rest with the
gearstick in neutral and the driver’s foot removed from the clutch
pedal, the engine switches off.
• A confirmation message is shown in the dash display (see right).
• The brakes automatically maintain enough pressure to hold the car
on a slope with a gradient up to 10%, whether facing up or down.
• The engine restarts as soon as the driver depresses the clutch
pedal. An uprated starter motor restarts the engine in about two
tenths of a second – faster, more quietly and more comfortably
than on other cars equipped with similar systems.
• By the time the driver has engaged first gear and is ready to release
the clutch, the engine has reached idle speed prior to driving away.
• Start-stop is activated automatically once the engine is warm, but
can be deactivated at any time by pushing a button on the dash.
Less wasted motion – efficiency through recuperation.
The Audi A3 1.4 TFSI with manual transmission, all Audi A4, A5
Coupé, new A5 Sportback and A5 Cabriolet derivatives, plus the A6,
Audi Q5 (pictured below right) and Audi Q7 ranges are now fitted
with a brake energy recuperation system which makes use of the
car’s kinetic energy during deceleration.
How it works: recuperation
Brake energy recuperation makes use of a car’s kinetic energy during
deceleration. The vehicle’s alternator converts the kinetic energy
produced during braking into electrical energy which is then stored
in the battery, reducing the load on the alternator and helping to
reduce fuel consumption.
Benefits to fleet operators and drivers: start-stop
• Reduced CO2 emissions promotes lower BIK tax for drivers than
previously as start-stop-equipped models fall into lower tax bands
than non-start-stop-equipped cars.
• Employers’ Class 1A National Insurance Contributions are reduced
as these are also based on CO2 emissions.
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New A1 compact range (right) nears production;
hybrid powertrain enhanced further.
Audi developed its hybrid compact car project further in 2008 with
the unveiling of the A1 Sportback Concept at the Paris motor show.
The five-door is an interpretation of the original A1 project quattro
shown in 2007. Using a 1.4-litre TFSI engine in conjunction with a
27bhp electric motor, CO2 emissions are reduced to just 92g/km.
Yet the car is capable of reaching 62mph from rest in 7.9 seconds
and has a maximum speed of 124mph.
The A1 Sportback Concept uses the latest lithium ion batteries
to enable a zero-emissions range of up to 62 miles without
intervention from the petrol engine.
World-class, clean-burning TDI technology.
Audi’s TDI diesel engine technology is proven on road and track, with
the diesel-powered R10 TDI sports-racer taking three consecutive
outright wins at Le Mans in 2006, 2007 and 2008. In many circles,
TDI is seen as the generic term for technical excellence. TDI models
are available across the Audi range (except R8).
A4 and A6 TDIe models.
High-efficiency TDIe models are available in the A4 and A6 ranges,
while the new 1.6 TDI engine powering the A3 and A3 Sportback
has CO2 emissions from just 109g/km.
The new A4 2.0 TDIe Saloon is the latest high-efficiency model
in the Audi range, and possesses CO2 emissions of just 120g/km,
placing it in the 13% band for BIK tax – the most advantageous for
a diesel. With combined fuel consumption of 61.4mpg, it makes the
Audi A4 2.0 TDIe one of the most efficient models in the compact
executive sector. Yet with a healthy 136PS, it blends spirited
performance with fine dynamic appeal.
TDIe technology is also available in the A6 and A6 Avant ranges,
with both models emitting just 139g/km of CO2 and achieving
53.3mpg on the combined cycle.
Audi valvelift system enhances performance from TFSI engines.
The Audi valvelift system controls engine valve lift on TFSI petrol
engines in two stages, ensuring optimum combustion chamber
filling under all engine load situations. It regulates the amount of
combustion air drawn into the engine by varying inlet valve lift; in
most cases the throttle butterfly can therefore remain fully open,
which largely eliminates undesirable throttling losses. The engine
therefore breathes more freely and develops higher power and
torque with lower fuel consumption and emissions.
Sports models benefit from lower CO2.
The new V6 3.0 TFSI engine in the all-new Audi S4 and S4 Avant,
launched in November 2008, not only decisively outperforms its V8
predecessor but does so with a 30% reduction in CO2 emissions and
improved fuel consumption.
A supercharger and direct injection FSI technology with valvelift
help the new S4 Saloon return 29.1mpg on the combined cycle
– a 27% improvement over the previous V8-powered S4 – while
emitting 225g of CO2, 30% lower than its predecessor (S4 V8
manual 322g/km).
February 2010
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