Special Thanks: Çağatay Auto
E as in efficiency: electrification of the powertrain is extended
The electrification of the powertrain takes another major step forward with the facelift of the E-Class. The new two-door models also see the top version of the four-cylinder diesel engine (OM 654 M), rated at 195 kW, fitted for the first time with an integrated starter-alternator (ISG). It therefore has a 48-volt on-board partial electrical system. A recuperation function and the ability to “glide“ with the engine switched off make the engine even more efficient.
Ongoing development work means that the integrated starter-alternator used here is a second-generation unit that is now part of the transmission (rather than of the engine). This means that it can be more easily combined with different engines. The extra boost that is available right from the first turn of the engine, known as EQ Boost, can deliver as much as 15 kW and 180 Nm, thus ensuring that the driving enjoyment offered by both of the sporty two-door models is even more pronounced.
The 48-volt technology with ISG is also a feature of the in-line six-cylinder petrol engine (M 256), now available for the first time in the E-Class. As with the Saloon, Estate and All-Terrain models, this unit has now been added to the engine line-up for the two-door models. A unit that is already familiar from the CLS, S-Class and GLE, its electrical boost of up to 16 kW and as much as 250 Nm reinforces the sporty character of both the Coupé and the Cabriolet. The standard combination with the all-wheel drive system 4MATIC further accentuates the dynamism of these two models. The systematic electrification of the engine is a major factor in the exceptional efficiency of the powertrain and evidence of the company’s forward-looking drive system strategy.
New technical features for the OM 654: on the way to becoming the most powerful four-cylinder diesel
Fundamental further technical development is envisaged for the OM 654 four-cylinder diesel engine introduced in 2016. Leading the way among the measures aimed at further improving efficiency is the new OM 654 M with integrated starter-alternator. Along with electrification, which also includes the use of an electric refrigerant compressor for the air-conditioning system, the following are the most important modifications that allow an output of up to 195 kW plus an additional 15 kW from the EQ Boost system: