Mercedes-Benz S-Class Drive System







Published by Gerald Ferreira Date: November 14, 2013
Categories: Mercedes-Benz, Mercedes-Benz S-Class

Class-leading efficiency in every output category

Mercedes-Benz S-Class Drive System

In its first year the new S-Class line-up features one hybrid versions, one petrol model and a diesel variant: S 400 HYBRID, S 500 and S 350 BlueTEC. All models boast class-leading efficiency and up to 20 percent lower fuel consumption than the outgoing model series. All the engines already meet the requirements of the Euro 6 emissions standard.

"The new S-Class achieves consumption and emissions figures that only a few years ago would have seemed idealistic even in the medium-luxury segment," says Dr. Martin Zimmermann, President and CEO, Mercedes-Benz South Africa.

"And this is just the start of our 'Green Leadership' initiative: soon to be followed by the
S 500 PLUG-IN HYBRID – the first S-Class with fuel consumption lower than four litres per 100 kilometres. The S-Class line-up therefore includes the full range from petrol and diesel models to petrol, and plug-in hybrids for the first time,” adds Zimmermann.

Effective helpers: ECO start/stop function and ECO display

The excellent consumption and emission figures are also due to the ECO start/stop function specified as standard for all S-Class models. The ECO start/stop function switches the engine off as soon as the vehicle stops – for example at traffic-lights – and the driver keeps the brake pedal depressed after coming to a halt. The engine restarts immediately when the driver releases the brake pedal.

One of the features that assist the driver is the ECO display in the instrument cluster. If required, three bar charts give drivers feedback about the economy of their driving style. The ECO display responds positively if the driver accelerates moderately, drives smoothly in an anticipatory manner and avoids unnecessary braking. The three bar readings stand at 100 percent if driving is particularly economical according to these criteria. When starting off all the values are at 50 percent, and a particularly unfavourable driving style causes them to decline. The aim is to encourage a competitive desire in the driver to achieve 100 percent if possible.

Further efficiency-enhancing measures include outstanding aerodynamics, intelligent lightweight construction, second-generation low-rolling-resistance tyres, an electronically controlled refrigerant compressor, and the new "ECO Thermo Cover" engine compartment encapsulation in the S 300 BlueTEC HYBRID, which reduces cold-starting losses and consists of insulating partitions in the engine compartment and the radiator shutter, which closes when the engine is stopped.

The "energy-transparent vehicle" tool created in-house by Mercedes-Benz was used as part of the S-Class development process. This method detects the possibilities for optimisation in even the most, minute component. An exact and meticulous examination of the flow of energy throughout the vehicle (tank to wheel) helps the development engineers to optimise every single assembly that has an impact on fuel consumption, right down to individual wheel bearings.

S 400 HYBRID: 20 percent more economical than the preceding model

Even in the previous model series, the S 400 HYBRID was the world's most economical petrol-engined luxury saloon for some time. With the hybrid model, which combines a V6 petrol engine with a compact hybrid module, the Mercedes-Benz engineers have made further advances in efficiency: the new S 400 HYBRID boasts NEDC (combined) fuel consumption of just 6.8 litres per
100 kilometres, and the CO2 emissions figure of 159 grams per kilometre is extremely efficient.  These exemplary figures are coupled with outstanding performance potential: the petrol engine develops 225 kW – and the electric motor adds another 20 kW. The peak torque is 370 Nm (+250 Nm).

The compact hybrid module is a disc-shaped electric motor that also acts as a starter and generator. The system offers a double benefit, as it both helps to save fuel and, owing to the booster effect of the electric motor, powerfully backs up the internal combustion engine during the high-consumption acceleration phase. The S 400 HYBRID accelerates from 0 to 100 km/h in
6.8 seconds and reaches an electronically limited top speed of 250 km/h.

When the vehicle decelerates, the electric motor acts as a generator and can recuperate the braking energy. The recuperated energy is stored in a compact yet highly efficient lithium-ion battery in the engine compartment and made available when required. 

Mercedes-Benz S-Class

S 500: the most efficient V8 petrol model in the luxury class

The V8 biturbo unit in the S 500 has a displacement of 4663 cc and an output of 335 kW  – making it more powerful than its 320 kW predecessor. Its peak torque is 700 Nm, while NEDC combined fuel consumption is just 8.6 litres per 100 km (premium unleaded) – lower than its predecessor. CO2 emissions are 213 g/km.

The excellent efficiency goes hand in hand with superior performance: the S 500 sprints from zero to 100 km/h in an impressive 4.8 seconds. Its top speed is 250 km/h (electronically limited).

S 350 BlueTEC: V6 with the fuel consumption of a four-cylinder engine

The V6 diesel engine in the S 350 BlueTEC has a displacement of 2987 cc, an output of 190 kW and a torque of 620 Nm. Its combined fuel consumption of 5.5 or 5.6 litres per 100 kilometres makes it the “world's most economical” V6 diesel and puts it on a par with the previous four-cylinder S 250 CDI model.

The S 350 BlueTEC has CO2 emissions of 155 grams per kilometre, and it is equipped with the
second-generation AdBlue® emission-control system.

Model data at a glance:

Model

S   400 HYBRID

S   500

S   350 BlueTEC

Number   of cylinders/arrangement 6/V 8/V 6/V
Displacement   (cc)

 

3498 4663 2987
Rated   output (kW at r/min) 225   at 6500 335   at 5250 190/258   at 3600
Rated   output of electric motor (kW) 20 - -
Rated   torque (Nm at r/min) 370   at 3500-5250 700   at 1800-3500 620   at 1600-2400

 

Rated   torque of electric motor (Nm) 250 - -
Combined   fuel consumption from (l/100 km) 6.3   S1 8.6   S1 5.5
Combined   CO2 emissions from (g/km) 159 213 155
Acceleration   0-100 km/h (sec)

 

6.8 4.8 6.8
Top   speed (km/h)

 

250 250 250

1 Figures for short/long wheelbase

7G-TRONIC PLUS: outstandingly smooth gear changes as standard

All new S-Class models feature the 7G-TRONIC PLUS automatic transmission with DIRECT SELECT lever as standard. The features of the latest version to emerge include a new torque converter with reduced slip, an ECO shift mode with a wider ratio spread and an auxiliary oil pump to maintain the operating pressure during automatic stops. Low-friction components and low-viscosity oil help to reduce the operating pressure.