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Mercedes-Benz introducing diesel E 300 BlueTEC HYBRID with fuel economy of 56 mpg US; gasoline-engined E 400 HYBRID model to follow
28 March 2012
|E 300 BlueTEC HYBRID Click to enlarge.|
Mercedes-Benz is introducing the new E 300 BlueTEC HYBRID; the luxury-class diesel hybrid offers fuel consumption of 4.2 L of diesel/100 km (56 mpg US), with CO2 emissions of 109 g/km. (Earlier post.) The E 300 BlueTEC HYBRID is based on the E 250 CDI, yet has a higher output and approximately 15% lower fuel consumption.
This diesel hybrid will be available in the European market as a Saloon and Estate from the third quarter 2012. Daimler will introduce the Mercedes-Benz E 400 HYBRID—equipped with a V6 gasoline engine—into in the US market, and later in other countries such as Japan and China. In 2009, Mercedes-Benz introduced the S 400 HYBRID. (Earlier post.)
Modular hybrid technology opens up the way for us to rapidly add hybrid models to other model series. With a clear focus on the varying needs of the worldwide markets, we are able to offer precisely the models that our customers require.—Professor Dr. Thomas Weber, the member of the Daimler Executive Board for Group Research and Head of Mercedes-Benz Cars Development
|E 300 BlueTEC HYBRID|
|Engine||4-cyl. in-line diesel|
|Rated output||150 kW/204 hp|
|Battery output/capacity||19 kW/0.8 kWh|
|Motor output||20 kW|
|Motor torque||250 N·m|
|Electric range||1 km|
|Motor torque||250 N·m|
The modular hybrid concept requires no modifications to the bodyshell; the hybrid module can be used flexibly in other model series and there will be right-hand drive versions apart from the diesel and gasoline models.
In the E 300 BlueTEC HYBRID, Mercedes-Benz has combined the 2.2-liter, four-cylinder diesel engine developing 150 kW (204 hp) and 250 N·m (184 lb-ft) torque with an electric motor rated at 20 kW and 250 N·m.The hybrid drive unit is a further development of the module from the S 400 HYBRID and is based on the 7G-TRONIC PLUS automatic transmission. Features include omission of the hydraulic torque converter and the addition of a wet clutch of the kind also found in the high-performance AMG models.
Consequently, the electric motor can be integrated in the transmission unit in such a way that it takes up only 65 mm more space than the 7G-TRONIC. The omission of the converter allows all-electric motoring as well as sailing, thus significantly boosting the potential to reduce fuel consumption.
The compact electric motor, which is installed in space-saving configuration in the clutch housing between engine and transmission, is a 3-phase AC internal rotor magneto motor which generates a maximum output of 20 kW and peak torque of 250 N·m at an operating voltage of 120 volts.
The motor assists the diesel engine when the car is accelerating (boost effect) and, in alternator mode, is used for the recuperation of braking energy, although it is also suitable for driving under electric power alone.
In combination with a 19 kW, 0.8 kWh lithium-ion battery pack, the modular hybrid system requires little installation space and weighs around 100 kg. The space-saving installation of the battery pack in the engine compartment in place of the conventional starter battery means that the interior dimensions and the luggage compartment capacity remain unchanged. In addition to serving as an energy accumulator for the electric motor, the lithium-ion battery is also connected via the voltage converter to the 12V on-board electrical system, which supplies power to standard power-consuming devices such as the headlamps and the comfort features.
The internal combustion engine can be switched off when coasting on the overrun at speeds up to 160 km/h (99 mph), since ancillaries such as the steering, brakes and refrigerant compressor operate electrically. It is restarted quickly, smoothly and virtually silently. Sailing is possible at speeds below 160 km/h. The combustion engine shuts down and the desired speed is maintained by the electric‑motor alone until the battery needs recharging.
Electrical power alone is used for moving off and driving under low load. Acceleration from standstill is particularly powerful, since the electric motor's full torque of up to 250 Nm is immediately available. The electric motor supports the combustion engine during acceleration, e.g. when overtaking.
The E-Class hybrid can run on electric power alone at speeds up to 35 km/h (22 mph) and for up to one kilometer (0.62 mile). In most cases the car uses electric power alone for maneuvering and parking.
When the car is being driven at a constant speed, the engine control unit shifts the operating points towards low specific fuel consumption levels. When the car is coasting (decelerating on the overrun), the electric motor acts as a generator. When the brake pedal is depressed, the generator output is initially increased proportionally for greater deceleration. Only when increased brake pressure is applied are the wheel brakes also operated.
The central display provides information on the current energy flow and the charge status of the battery.
On the road, the E 300 BlueTEC HYBRID is comparable to the E 300 CDI (170 kW/540 N·m),but with around 35% lower fuel consumption and CO2 emissions. In terms of vehicle weight too, the E 300 BlueTEC HYBRID is on a par with the E 300 CDI.
Mercedes-Benz says that the E 300 BlueTEC HYBRID will receive an environmental certificate according to ISO standard TR 14062 from the neutral examiners at TÜV Süd in time for market launch.
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