Plug-in hybrids are an important milestone on the road to zero-emissions driving. Mercedes‑Benz Cars is pushing ahead with the development of its plug-in hybrids under the EQ Power label.

With the A 250 e (combined fuel consumption 1.5-1.4 l/100 km, combined CO2 emissions 34-33 g/km, combined electrical consumption 15.0-14.8 kWh/100 km)* , A 250 e Sedan (combined fuel consumption 1.4 l/100 km, combined CO2 emissions 33-32 g/km, combined electrical consumption 148 -147 kWh/100 km)* and B 250 e (combined fuel consumption 1.6-1.4 l/100 km, combined CO2 emissions 36-32 g/km, combined electrical consumption 15.4-14.7 kWh/100 km)* models from the compact-car family with the third-generation hybrid drive are now celebrating their premiere.

For the new compact vehicles with EQ Power, (electric) driving pleasure and suitability for everyday use are to the fore. This is illustrated by the models highlights:
– Electric operating ranges of 70-75 km (NEDC)
– Electric output 75 kW
– System output 160 kW
– System torque 450 Nm
– Top speed 140 km/h (electric)/235 km/h (total; A-Class Compact Sedan)
– Acceleration 0-100 km/h in 6.6 seconds (A-Class Compact Sedan)

The vehicles belonging to Mercedes-Benz’s compact car family feature transversely mounted engines. A compact hybrid traction head has been developed for the 8F-DCT dual clutch transmission which follows the same technical principles as the corresponding component on the vehicles with a longitudinally installed engine. It is a permanently excited synchronous machine as an internal rotor. The stator is permanently integrated in the traction head housing, while the low-loss wet clutch is incorporated in the electric machine’s rotor. On-demand stator and rotor cooling allow use of the electric motor’s peak and continuous output without any problems.
For the first time on a Mercedes-Benz vehicle, the combustion engine is started by the electric motor – the compact hybrids do not have a separate 12-volt starter.

High system output provides for plenty of driving enjoyment

The electric machine achieves 75 kW. Together with the 1.33-litre four-cylinder engine this adds up to a system output of 160 kW (218 hp) and a system torque of 450 Nm. Thanks to the EQ Power of the electric machine the A 250 e and B 250 e react immediately to a step on the accelerator, and the performance is impressive: the A 250 e, for example, requires 6.6 seconds for the sprint from 0 to 100 km/h, and its top speed is 235 km/h (see next page for further data).

A lithium-ion high-voltage battery with a total capacity of approx. 15.6 kWh is used as an electric energy storage unit. It can be charged at an external electric energy source. The A 250 e and B 250 e can be charged with alternating or direct current. A corresponding vehicle socket is located in the right-hand side wall of the vehicles. This means that the compact plug-in hybrids can be charged at a 7.4 kW Wallbox with alternating current (AC) within 1 h 45 min from 10-100 percent SoC (Status of Charge). For direct-current charging (DC) the battery can be charged from 10 – 80 percent SoC in around 25 minutes.

The batteries are supplied by the wholly owned Daimler subsidiary Deutsche ACCUMOTIVE. The high-voltage battery is water-cooled and weighs approx. 150 kg.

The Mercedes-Benz plug-in strategy

Plug-in hybrids offer customers the best of both worlds: in town they run in all-electric mode, while on long journeys they benefit from the range of the combustion engine. They make the vehicle more efficient overall because they can firstly recover energy during braking and secondly allow the combustion engine to run in favourable operating ranges. EQ Power also provides for highly dynamic performance. EQ Power+ stands for the high-performance hybrid technology which Mercedes‑AMG is already applying with success in Formula 1 and which it will be deploying on the road in future.

By the end of 2019 Mercedes-Benz will have more than ten plug-in hybrids in the range – an attractive portfolio from the compact car to the flagship Mercedes-Benz S-Class. The aim is to be able to offer customers well over 20 model variants in 2020.

The new plug-in hybrids of the S-, E- and C-Class with electric ranges of up to 50 km in accordance with NEDC were unveiled last year. In the C- and E-Class, Mercedes-Benz is the only manufacturer to combine the diesel engine with plug-in technology, offering this set-up in the Sedan and wagon versions of these two model series. The update of the GLC with EQ Power is already in the starting blocks. Also equipped with the third-generation hybrid drivetrain, it provides the point of entry to the SUV segment. The next member of the EQ Power family will be the GLE – with a planned range of around 100 km, it points the way to an even more powerful electric driving experience.