New Mercedes S-Class 2021 Test Drive video and description.
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More electrification, more efficiency
When the new Mercedes-Benz 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 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.
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