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Audi adds the start-stop and the efficiency program
To its fuel saving and emissions reduction measures

Start-stop system in the Audi A5.

Start-stop: status indicated in the central display of the A5.


13 May 2009.

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.

Audi A5 Start-stop system: on / off button.

The start-stop 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 deceleration phases.


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.

Audi A4 premium midsize car get the start-stop system.

New start-stop 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 button.

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.

  Efficiency Program

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.

  Energy recovery

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.

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