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Volvo introduces start/stop technology in cars with automatic gearbox

ABR Staff Writer Published 24 August 2011

Volvo Car has introduced a new start/stop technology in its vehicles equipped with a six-speed Geartronic automatic transmission.

The stop-start technology, which initially is only available on vehicles with the 2.0-liter D3 turbodiesel engine produces 163 hp and 400 Nm of torque, cuts CO2 emission by 10 g/km and reduces fuel consumption by 0.4 liter per 100 km, the company said.

Beginning in September 2011, the six-speed automatic gearbox with start/stop will be available in the D3 versions of four Volvo models: S60, V60, V70 and S80.

Volvo senior vice president of research and development Peter Mertens said continuously reducing CO2 emissions from conventional powertrains is an important part of our DRIVe Towards Zero emissions.

"It is the most effective way to cut CO2 throughout our model range in the short term and this work is running parallel with our innovative focus on electrification technologies," Mertens said.

The company said that combining start/stop with automatic gearbox is a larger technology challenge than the manual start/stop version already available in most Volvo models.

Without a signal from the clutch pedal as used in manual transmissions with start/stop, the engine must restart instantly when the driver moves his or her right foot from the brake pedal to the accelerator.

The automaker said that the start/stop system is programmed to shut down the engine immediately when the car reaches a standstill (0 km/h) and an electric pump keeps oil pressure up in the automatic gearbox while the engine is stopped.

The five-cylinder 2-litre turbo diesel is now available throughout Volvo Car's model range, which was introduced in the all-new Volvo S60 in 2010.

The five-cylinder D3 is in principle the same engine as the well-established 2.4-litre diesel, but its displacement has been reduced with a shorter stroke to optimise fuel consumption.