More electrification, more efficiency

Oct 28, 2020
Stuttgart

When the new S-Class is launched, six-cylinder in-line petrol and diesel engines in various output classes will be available, with a V8 engine with integrated starter generator (ISG) and a 48-volt onboard electrical system to follow shortly afterwards. A plug-in hybrid with an all-electric range of around 100 km will follow in 2021.

With the introduction of the integrated starter-generator (ISG) in the S-Class powered by the M 256 six-cylinder in-line engine in 2017, the 48 volt onboard electrical system celebrated its world premiere. The ISG is responsible for hybrid functions such as boost or energy recovery, while allowing fuel savings that were previously reserved for high-voltage hybrid technology. The systematically electrified six-cylinder in-line engine in the new Mercedes-Benz S 500 4MATIC (combined fuel consumption: 8.4-7.8 l/100 km, combined CO2 emissions: 192-179 g/km)[1] has an output of 320 kW/435 hp and 520 Nm of torque. EQ Boost provides a further 250 Nm of torque as well as 16 kW (22 hp) for a short period.

Intelligent, forced induction that includes an electric booster compressor, as well as the integrated starter alternator (ISG) provide outstanding power delivery without turbo lag. In addition, the engine starts extremely quickly and comfortably, making the start/stop function almost imperceptible to the driver.

In addition, systematic electrification dispenses with the need for a belt drive for ancillary components at the front of the engine, which reduces its overall length. The slim design as an in-line engine, together with the physical separation of intake/exhaust, creates space for a near-engine emission control system. The 48 V on-board electrical system serves not only high power consumers, such as the water pump and air-conditioning compressor, but also the integrated starter-generator (ISG), which also supplies energy to the battery by means of highly efficient energy recuperation.

Efficient, powerful and clean: the six-cylinder diesel

The engine line-up is rounded off by the six-cylinder diesel (OM 656). To meet current and emissions control requirements, the engine already familiar from the preceding S-Class since mid-2017 has been developed further. This is based on an integrated technological approach consisting of a stepped recess combustion process, dynamic multi-way exhaust gas recirculation and near-engine mounted exhaust aftertreatment. Thanks to the near-engine insulated configuration, the emission control system has little heat loss and ideal operating conditions. Other features of the flagship engine variant in the premium diesel family include two-stage turbocharging and CAMTRONIC variable valve control. Its design is characterised by the combination of an aluminium engine block and steel pistons, as well as the further improved NANOSLIDE® coating of the cylinder walls.

The exhaust aftertreatment has been extended. Its components include:

  • a combination of three exhaust gas recirculation (EGR) paths: This consists of the high pressure EGR path, the low-pressure EGR path and variable exhaust valve control (CAMTRONIC ) for the return flow of hot exhaust gases to the combustion chamber during warm-up under low engine loads, or when the exhaust temperature is low.
  • a close-coupled NOx storage catalytic converter for reducing the nitrogen oxides
  • a DPF (diesel particulate filter with special coating for also reducing the nitrogen oxides)
  • an SCR catalytic converter (Selective Catalytic Reduction with a metered injection of AdBlue®) and
  • an additional SCR catalytic converter in the vehicle's underbody.

The model range at the launch of the S-Class[2]

 

 

S 450 4MATIC

S 500 4MATIC

S 350 d

S 350 d 4MATIC

S 400 d 4MATIC

Transmission

automatic

9G-TRONIC

Engine (series, no. of cylinders, arrangement)

M 256, 6 in-line

OM 656, 6 in-line

Displacement

cc

2999

2999

2925

2925

2925

Output

kW/hp

270/367

320/435

210/286

210/286

243/330

at

rpm

5500-6100

5900-6100

3400-4600

3400-4600

3600-4200

Add. output with EQ Boost

kW/hp

16/22

16/22

-

-

-

Peak torque

Nm

500

520

600

600

700

at

rpm

1600-4500

1800-5.500

1200-3200

1200-3200

1200-3200

Add. torque with EQ Boost

Nm

250

250

-

-

-

Combined fuel consumption[3] NEDC

l/100 km

8.4-7.8

(8.3-7.8)

8.4-7.8

(8.4-7.8)

6.7-6.2

(6.7-6.2)

6,9-6,4

(6,8-6,3)

7.0-6.5

6.9-6.4)

Combined CO2 emissions2 NEDC

g/km

191-178

(191-178)

192-179

(192-178)

176-163

(176-163)

183-168

(180-166)

186-171

(183-169)

Acceleration 0-100 km/h

s

5.1

4.9

6.4

6.2

5.4

Top speed

km/h

250

250

250

250

250

And here are the consumption values according to the WLTP[4][5]

 

 

S 450 4MATIC

S 500 4MATIC

S 350 d

S 350 d 4MATIC

S 400 d 4MATIC

Combined fuel consumption[6] WLTP

l/100 km

9.5-7.8 (9.4-7.8)

9.5-8.0 (9.4-8.0)

7.7-6.4 (7.7-6.4)

8.0-6.6 (7.9-6.5)

8.0-6.7 (7.9-6.7)

Combined CO2 emissions4 WLTP

g/km

215-178 (213-177)

216-181 (214-181)

204-169 (201-168)

211-172 (209-171)

211-175 (209-175)

Many engine variants can be combined with the 4MATIC all-wheel drive system. The front axle transmission has been further improved. It is able to transfer higher torque levels while being considerably lighter.

 

[1] The stated figures relate to the S-Class with long wheelbase and are the measured "NEDC CO2 figures" in accordance with Article 2 No. 1 Implementing Regulation (EU) 2017/1153. The fuel consumption figures were calculated based on these figures. A higher figure may apply as the basis for calculating the motor vehicle tax. Further information about the vehicles offered, including the WLTP figures, can be found for each country at www.mercedes-benz.com 

[2] Values for the saloon with long wheelbase (V 223). Values for the model with short wheelbase (W 223) in brackets, if different

[3] The stated figures are the measured "NEDC CO2 figures" in accordance with Article 2 No. 1 Implementing Regulation (EU) 2017/1153. The fuel consumption figures were calculated based on these figures. A higher figure may apply as the basis for calculating the motor vehicle tax. Further information about the vehicles offered, including the WLTP figures, can be found for each country at www.mercedes-benz.com 

[4] The following WLTP details on the stated vehicles are based on the consumption and CO2 figures valid in the German market and are to be understood as indicative information. Depending on the chosen equipment, the specific vehicle can lie between the "WLTP Minimum CO₂/Consumption Value" and the "WLTP Maximum CO₂/Consumption Value". A higher figure may apply as the basis for calculating the motor vehicle tax.

[5] Values for the saloon with long wheelbase (V 223). Values for the model with short wheelbase (W 223), in brackets if different

[6] The stated figures were determined in accordance with the prescribed measuring method. They are "WLTP CO₂ figures" as per Article 2 No. 3 Implementing Regulation (EU) 2017/1153. The fuel consumption figures were calculated based on these figures.

Loading