Drive system
Thanks to systematic electrification and intelligent downsizing, the new E-Class sets new standards in efficiency. The E 200’s combustion engine is a four-cylinder unit with needs-based electrification.
In addition to turbocharging, the petrol engine features intelligent support from an integrated starter-generator (ISG). Thanks to a new battery in the mild-hybrid, the power of the electric motor has been increased from 15 to 17 kW and the boost torque to 205 Nm
With an electric output of 95 kW (129 hp) and an all-electric range of up to 118 kilometres (WLTP), the E 350 e will in many cases and on many days be on the road purely electrically, without the use of the combustion engine. The system output of the E 350 e is up to 230 kW (313 hp).
The high power density of the hybrid traction head is achieved using a permanently excited synchronous motor with internal rotor. The 550 Nm peak torque of the electric motor is available right from the start, resulting in high agility when moving off, along with dynamic driving performance. The full electric power is available up to 140 km/h, at which point it is softly capped.
The operating strategy communicates with the sensors of the assistance systems and thus efficiently supports the driver in many driving situations. Two additional driving modes enable the driver to make particularly advantageous use of the plug-in powertrain:
• BATTERY HOLD: Maintaining the charge state of the high-voltage battery is given priority, e.g. when intending to drive in a city centre; selection of the most suitable drive configuration by the hybrid powertrain system is done by the hybrid powertrain system, depending on the driving situation and route.
• ELECTRIC: Electric driving up to 140 km/h, adaptation of Active Distance Assist DISTRONIC for electric driving, activation of the combustion engine using a pressure point of the accelerator pedal.
The energy recovery function allows kinetic energy to be recuperated during deceleration or downhill driving, a process that has now been improved in interaction with the hydraulic brake. The recuperation power can be as much as 100 kW. In DAuto mode, the system automatically selects the level of recuperation power according to the traffic situation. A driver wishing to influence the energy recovery rate can do so directly in three stages controlled by rocker switches behind the steering wheel. This is possible in all driving modes except SPORT. In driving mode D-, for example, the driver can experience the "one-pedal feeling": when the driver's foot leaves the accelerator, the vehicle slows down purely electrically, to an extent that the hydraulic service brake is often not needed.
Another high-tech feature is the intelligent, electromechanical brake booster. It ensures that the braking system very efficiently combines electric recuperation with the hydraulic service brake. In addition, the automatic transmission performs several gear changes during deceleration. Depending on the driving situation and the braking requirements of the driver, the vacuum-independent braking system automatically controls the flexible transition between hydraulic braking and recuperation. This allows the maximum recuperation power to be achieved more frequently and over a longer period of time. For this purpose, the system variably reduces the braking power of the hydraulic brake, even at constant pedal pressure, so that the high recuperation power is maintained as speed decreases. The driver is not aware of this automatic change.
The high-voltage (HV) battery has been developed in-house by Mercedes-Benz AG. It is part of a fourth-generation family of batteries and represents a logical evolution of the previous generation. It consists of 96 cells in a so-called pouch configuration. The battery energy content is 25.4 kWh. 19.5 kWh of this is available for electric operation. To account for the high energy density, the HV battery has an internal cooling system.
The thermal management system can therefore control the operating temperature irrespective of the climate control in the vehicle interior. In addition to continuous operation in hot and cold regions, this also allows quick charging with direct current. Even when the battery is completely discharged, it can be fully charged in around 30 minutes with the on-board 55 kW DC charger.
Additional safety and situation-related support
The driving assistance systems of the E-Class include ATTENTION ASSIST, Active Brake Assist, Active Lane Keeping Assist, and the Parking package with 360-degree camera. The status and activity of the driving assistance systems are shown as a full-screen view in the Assistance mode of the driver's display. The Active Distance Assist DISTRONIC system relieves the driver by regulating the speed to match that of slower vehicles ahead. The desired safety distance can be set in several increments.