Showing posts with label hybrid. Show all posts

The Citaro G BlueTec Hybrid – drive for environmental protection

By | Published Thursday, 15 March 2012

Electromobility is nothing new either to local public transport or more specifically buses. Today more than two thirds of German public transport services are electrically run. As early as 1969 Mercedes‑Benz presented the world’s first hybrid bus at the IAA. Nevertheless this drive technology has still not been able to assert itself on a wide scale; a situation which is now being tackled from a number of different angles. By promoting new drive concepts and realizing intermodal mobility concepts, many transport companies are contributing to the breakthrough of environmentally friendly drive technologies such as hybrid technology. On 13 March 2013, Head of Public Transport Fleet Sales at Mercedes-Benz buses, Tammo Voigt, was on-hand to hand over a Mercedes-Benz Citaro G BlueTec Hybrid bus to WSW mobil GmbH in Wuppertal. Ulrich Jäger, Managing Director at WSW mobil GmbH acknowledged the potential of the drive system: "Hybrid technology is the solution for environmentally friendly local bus services of the future. It will only be possible to implement the ambitious climate targets of the European Union by 2050 if all areas of transport policy are consistently oriented towards environmental protection."


Promote and demand

The Rhein-Ruhr transport association (VRR), of which WSW mobil GmbH is also a member, launched a promotional programme for buses with hybrid technology in 2009. Today approximately 70 hybrid buses belonging to VRR transport companies have been subsidised with the help of the programme for "Innovative projects for the improvement of local public transport". The objective is to pool the findings and experience gained with regard to the new technology as part of a research programme and put them at the disposal of other transport companies and vehicle manufacturers. Ulrich Piotrowski is responsible for the market launch of hybrid and electric buses at Mercedes‑Benz. He believes that: "Wuppertal is just perfect for using the Citaro G BlueTec Hybrid. The demanding topography provides sufficient opportunity for energy recuperation via the brakes, but, if necessary, can also clearly demonstrate deficits thanks to the challenging routes. The experience gained during daily operations is invaluable to the further development of vehicles."

Mercedes-Benz Citaro G BlueTec Hybrid

When topographical conditions are ideal, the Citaro G BlueTec Hybrid can drive up to 10 kilometres using exclusively electric power without the help of the diesel engine. Four electric wheel hub motors which draw their power from lithium ion batteries provide the drive. Electric current is generated when the brakes are applied and, if required, can also be obtained via a generator which is driven by a small diesel engine. Experts speak of a serial hybrid in this context.

Needs-based equipment

The technically sophisticated diesel-electric hybrid concept has been realised in the well-established articulated version of the successful Mercedes-Benz Citaro urban bus family. The light blue vehicle hardly differs from the rest of the WSW Citaro fleet. The bright and friendly interior is characterised by large windows. The traffic red grab rails are a contrast to the blue seat covers. A video surveillance system with five cameras improves safety and avoids damage through vandalism. The climate control in the passenger compartment and at the driver's workplace can be regulated independently of one another via the overhead air-conditioning system. The air-conditioning concept, just like the fire alarm system and the automatic fire extinguishing system in the engine compartment, is standard WSW equipment.

Two 48.26 cm TFT monitors in the front and rear sections display the names of bus stops. When connected to the IBIS on-board computer, information regarding route progress and the name of the next bus stop are displayed. The IBIS is not only responsible for the control of the passenger information systems, but also for traffic signal preemption in Wuppertal. The control centre can directly transmit acoustic and visual information to one or all of the vehicles on the service route. The exact position of the vehicle is determined, evaluated and transmitted to the passenger information boards located at the bus stops using GPS. Passengers at the bus stops are thus informed in real time about exact arrival and departure times.

HighTec in urban buses

Four electric motors influence the driving characteristics of the Citaro. They accelerate the 18 meter long bus quickly and almost silently. As no transmission is used, passengers notice no jerking typical of gear changes. The drive output of the wheel hub motors is 320 kW, supplied as required by the battery and the diesel engine driven generator. These electric motors are also used for braking the vehicle. They then function like generators and convert the brake energy into electric current for the battery. If the battery indicates that it requires more power, the diesel engine automatically starts in order to generate additional energy. In comparison to a bus that runs on diesel only, the combustion engine is only half the size, weighs only 450 kg instead of 1000 kg and its engine capacity is 4.8 litres as opposed to 12 litres. At 160 kW, its output is about one third lower.

The energy storage unit used in the Mercedes‑Benz Citaro G BlueTec Hybrid is a lithium ion battery. The battery system supplies a maximum of 240 kW and, weighing less than 350 kg, is comparably light. Compared to conventional battery systems, batteries with ion technology impress with a higher energy density in conjunction with a greater storage capacity and lower weight.

WSW mobil GmbH

At present the 100 percent subsidiary of the Wuppertal Stadtwerke GmbH employs around 740 employees. In 2010, 89.6 million passengers used the WSW mobil GmbH services. The bus fleet comprises approximately 300 regular service buses. Together the 65 service routes are 633.7 km long, whereby the service stretches from Wuppertal and Solingen via Remscheid to as far away as parts of the Ennepe-Ruhr district.
Credits: Daimler AG

Copyright © 2012, Mercedes-Benz-Blog. All rights reserved.

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Mercedes-Benz at the Geneva Motor Show 2012: Dynamism and efficiency

By | Published Tuesday, 6 March 2012

The beating pulse of a new generation: the centrepiece of Mercedes-Benz's appearance at the Geneva Motor Show (8 to 18 March 2012) will be the world premiere of the new A-Class, the sporty Mercedes in the compact segment. Also totally new is the SL 63 AMG, offering high performance par excellence. The E 300 BlueTEC HYBRID – the world's most fuel-efficient model in the luxury segment – will be on show for the first time in Europe, as will the lightweight, athletic and luxurious SL-Class and the ML 63 AMG. The SLK 55 AMG will be appearing for the first time in Switzerland. The C-Class Sport offers a new dimension in sportiness, while the C 180 and E 220 CDI BlueEFFICIENCY Edition are shining beacons of efficiency. The CL "Grand Edition" stands for the ultimate in elegant luxury.


With the new A-Class, Mercedes-Benz is opening a new chapter in the compact segment: emphatically emotional in design, dynamic, with engines rated from 80 kW (109 hp) to 155 kW (211 hp), highly efficient with emission values as low as 99 g CO2/km. The A-Class is a clear statement on the dynamism of the Mercedes-Benz brand. At the same time, it also highlights the fact that safety is not a matter of price at Mercedes-Benz – with standard-fit features including the COLLISION PREVENTION ASSIST radar-based assistance system. The new A-Class (length/width/height: 4292/1780/1433 millimetres) will be making its way to European dealers in September 2012.

"A stands for 'attack': the A-Class is a clear statement on the new dynamism of the Mercedes-Benz brand," says Dr Dieter Zetsche, CEO of Daimler AG and Head of Mercedes-Benz Cars. "It is new down to the last detail. Such an opportunity to begin with a blank sheet is rare in the field of car development. Our engineers and designers have seized this opportunity in convincing style."

The design of the A-Class: emotional with a very sporty character

The design credentials and dynamism of the new A-Class are immediately apparent at first glance as it crouches up to 18 centimetres lower on the road than its predecessor. The design idiom presented with the "Concept A-CLASS" has been adopted wholeheartedly in the series production vehicle: with a new interpretation of the classic two-box design, the Mercedes designers have created an emotional exterior with a very sporty character. " Applying the new dynamic style of Mercedes-Benz to the compact class was a challenge that we thoroughly enjoyed"," relates Gorden Wagener, Head of Design at Mercedes-Benz. "The sculptural aspect of the A-Class design is typically Mercedes. The feature lines on the sides in particular lend the A-Class structure and a welcome edginess."

The aim in designing the interior was to complement the exterior's sporty appearance. The interior additionally derives a quality feel which is unique in the compact segment from the design idiom, the selection of high-quality materials and the available combinations of materials. And as with the Concept A-CLASS, a smartphone can be fully integrated into the control and display system. A dedicated app allows full use of the functions offered by the iPhone®, with other smartphones to follow in the future.

All trim surfaces feature an electroplated finish in "silver shadow", giving them a genuine metallic surface with "cool touch" effect. "This is just one example of the way in which the quality of the A-Class's interior is not defined by classic trim elements but by consistent design and by the specific materials used", explains Hartmut Sinkwitz, Head of Interior Design. "The motto we used when designing the interior was 'pure sportiness, newly interpreted'."

Sporty exclusivity: the Sport edition redefines dynamic performance

The performance specialists from AMG were involved for the first time at an early stage of the development process for the compact car. This involvement has spawned the model line's most dynamic version – the A-Class Sport Edition engineered by AMG, whose looks reveal a particularly close affinity to the Concept A-CLASS – by virtue of the new diamond grille, for example.

The drive: new engines for petrol and diesel fuel

A broad range of petrol and diesel engines covers all power requirements while defining a new benchmark in efficiency: for the first time ever, a Mercedes-Benz will emit only 99 g of CO2 per kilometre.

The new generation of petrol engines with a displacement of 1.6 and 2.0 litres covers an output spectrum ranging from 90 kW (115 hp) in the A 180 through 115 kW (156 hp) in the A 200 to 155 kW (211 hp) in the A 250. Features common to all these engines are the combination of direct injection with exhaust-gas turbocharging, an enhanced combustion process and extended stratification ranges for lean-burn operation by means of fast-acting injectors for multiple fuel injections and multiple ignition according to the prevailing requirements. The 1.6-litre engine features the world premiere of the innovative CAMTRONIC system. As a result of adjustment of the valve lift at the intake end the quantity of fresh gas is limited in the partial load range, reducing fuel consumption.

The diesel engines also boast extreme efficiency and environmental friendliness, thanks to state-of-the-art injection technology and turbocharging. The A 180 CDI kicks off at 80 kW (109 hp) and offers maximum torque of up to 250 Nm, while in the A 200 CDI the maximum power output stands at 100 kW (136 hp), accompanied by maximum torque of 300 Nm. The A 220 CDI has a displacement of 2.2 litres and generates 125 kW (170 hp) of power and 350 Nm of torque, enabling outstanding performance in the A-Class.

All engines of the new A-Class feature the ECO start/stop function as standard. The engines can be combined with the new six-speed manual transmission or optionally with the 7G-DCT dual clutch automatic transmission.

Other highlights: chassis and suspension, aerodynamics, safety

The chassis realises the dynamism which is promised by the design and the drive technology. The substantially lowered centre of gravity and the new four-link rear axe provide the basis for the effective transmission of power to the road and for the potential deployment of 4MATIC all-wheel drive. The customer has a choice of various chassis and suspension set-ups, including the optional sports suspension with Direct-Steer system. The electromechanical steering of the A-Class has been redesigned. The electric motor of the servo assistance system is now located in space-saving configuration directly on the steering gear as a high-precision dual pinion EPS system.

The perfect aerodynamics of the A-Class grant it a Cd value of 0.26 – a new benchmark in its class. The standard-fit roof spoiler concealing all the aerials on board the A-Class is also a contributory factor here.

The A-Class is the only car in its segment to feature a radar-based collision warning system with adaptive Brake Assist as standard, which lowers the risk of rear-end collisions. The COLLISION PREVENTION ASSIST system gives a visual and acoustic warning to alert a possibly distracted driver to identified obstacles, and prepares Brake Assist for the most precise possible braking response. This is initiated as soon as the driver emphatically operates the brake pedal.

The PRE-SAFE® preventive occupant protection system is available for the first time in the A-Class. This marks the debut in the compact class of this innovation which was premiered in the S-Class back in 2002.

E 300 BlueTEC HYBRID: the world's most fuel-efficient luxury-class model

The new E 300 BlueTEC HYBRID is all set for its market launch with record efficiency values of 4.2 l diesel/100 km and 109 g CO2/km, accompanied by increased torque and power output. Its modular hybrid concept with lithium‑ion battery does not impose any compromises on space and offers an impressive driving experience thanks to start/stop, recuperation, boost effect, all-electric driving and sailing. The E 300 BlueTEC HYBRID is the world's most fuel-efficient model in the luxury segment.

Mercedes-Benz is setting new standards for luxury-class business vehicles: the E 300 BlueTEC HYBRID, which is available as a saloon and an estate, boasts truly impressive performance. Its 4-cylinder diesel engine generates 150 kW (204 hp) of power and 500 Nm of torque. The diesel engine combines with an electric motor rated at 20 kW and 250 Nm to produce a harmonious overall concept.

"The E 300 BlueTEC HYBRID represents the continuation of our comprehensive hybrid offensive. The modular technology paves the way for us to quickly introduce hybrid models to complement other model series," explains Professor Dr Thomas Weber, Daimler Board Member for Group Research and Head of Mercedes-Benz Cars Development. "By clearly focussing on the different requirements of the global markets, we are able to offer precisely the models that our customers want."

The new SL-Class: light, athletic, luxurious

The all-new SL sees Mercedes-Benz continuing a tradition that began 60 years ago, since when "SL" has always stood for a symbiosis of sportiness, style and comfort – and for trailblazing innovations. The SL consists almost entirely of aluminium for the first time and weighs in at up to 140 kilograms lighter than its predecessor. The highly rigid all-aluminium body-in-white provides the basis for emphatically sportier, agile handling accompanied by exemplary ride and driving comfort.

New BlueDIRECT engines provide for enhanced driving dynamics; they are more powerful and at the same time up to 29 percent more fuel-efficient than the previous generation of engines. Totally new features are the Frontbass system, a world-first that transforms the luxury sports car into a concert hall irrespective of whether the top is up or down, and the MAGIC VISION CONTROL adaptive wiper/washer system, which applies water to the windscreen from the wiper blade in the required quantities and according to the wiping direction.

SL 63 AMG: high-performance roadster

The latest version of the Mercedes-Benz SL 63 AMG high-performance roadster impresses on several counts: systematic lightweight construction, increased output and enhanced driving dynamics, all combined with a 30 percent reduction in fuel consumption and emissions. Thanks to an all-aluminium bodyshell, similar to that of the SLS AMG supercar, the vehicle has shed 125 kilograms. With a kerb weight of 1845 kilograms and an output of 395 kW (537 hp) or 415 kW (564 hp), the new model boasts the perfect ingredients for unparalleled dynamism and a sublime driving experience that is truly unique.

A further boost in performance comes courtesy of a winning combination: a further improved AMG sports suspension based on Active Body Control, new AMG speed-sensitive sports steering, the AMG high-performance compound braking system and the AMG SPEEDSHIFT MCT 7-speed sports transmission. An enticing mix of stylish design, extensive standard equipment and a high level of safety.

Intelligent lightweight construction is one of the major factors behind the low fuel consumption figures. The SL 63 AMG is built around a lightweight all-aluminium bodyshell similar to that of the SLS AMG supercar. Compared to the outgoing model, this design not only delivers a weight reduction of around 110 kilograms, it also greatly enhances rigidity, safety and comfort. The boot lid helps to further trim the weight. For the first time on a volume-produced model, the inner support is made from lightweight carbon-fibre composite. The extremely rigid carbon-fibre component is bonded to the plastic outer shell, resulting in a weight saving of five kilograms compared to a conventional boot lid.

SLK 55 AMG: top figures in all disciplines

The Mercedes-Benz SLK 55 AMG is the most powerful SLK of all time. Its newly developed naturally aspirated AMG 5.5-litre V8 engine with cylinder shut-off system combines ultimate performance with minimised fuel consumption. With a maximum output of 310 kW (422 hp) and peak torque of 540 Newton metres, the SLK 55 AMG outperforms all of its direct competitors. The SLK 55 AMG accelerates from zero to 100 km/h in 4.6 seconds, and reaches a top speed of 250 km/h (electronically limited). Its fuel consumption of 8.4 litres per 100 kilometres (NEDC combined) and CO2 emissions of 195 grams per kilometre are some 30 percent lower than the figures for its predecessor.

ML 63 AMG: efficiency and superlative performance

The new Mercedes-Benz ML 63 AMG stands for efficiency and performance, exclusivity and a superlative driving experience. Burning 11.8 litres of fuel per 100 kilometres (NEDC combined, 276 g CO2/km), the high-performance SUV undercuts its predecessor by 28 percent. The basis for the low fuel consumption and top-class performance is provided by the AMG 5.5-litre V8 biturbo engine. The eight-cylinder unit extracts a maximum power output of 386 kW (525 hp) and 700 Newton metres of torque from its displacement of 5461 cc. In conjunction with the AMG Performance package, these figures rise to 410 kW (557 hp) and 760 Newton metres. Both variants of the ML 63 AMG deliver sports car-like performance: the sprint from 0 to 100 km/h takes 4.8 seconds and 4.7 seconds respectively, while top speed stands at 250 km/h (electronically limited).

C-Class Sport: the C-Class has never been sportier

Mercedes-Benz is sharpening the profile of the C-Class: with the new "Sport" Coupé models developed with AMG and the new "AMG Plus Sports package", there has never been a wider choice of sporty versions. The new models are available from June 2012. The AMG Plus Sports package can be combined with all body and engine variants.

The name says it all – the new coupé models C 250 Sport and C 250 CDI Sport are decidedly dynamic, as the performance specialists at AMG were heavily involved in their development. In addition to the visually enhanced AMG Plus Sports package, both models have technical features which further increase driving enjoyment. Cornering and handling characteristics are more dynamic thanks to an AMG sports suspension, more direct speed-sensitive sports steering, a sports exhaust system and a more sporty transmission configuration in S and M mode. The matt paint finish "designo magno platinum" is exclusively available for the Sport models.

C 180, E 220 CDI BlueEFFICIENCY Edition: shining beacons of efficiency

Presenting the most economical E-Class diesel and C-Class petrol models to date: with fuel consumption of 4.5 litres/100 km and emissions of 119 g CO2/km for the
E 220 CDI BlueEFFICIENCY Edition and 5.8 litres/100 km and 136 g CO2/km for the new C 180 BlueEFFICIENCY, Mercedes-Benz is giving an impressive demonstration of just how much potential is still left in the internal-combustion engine. Take the
C-Class, for instance: since its predecessor was launched in 2000, the output of the
C 180 has increased by 21 percent, whilst consumption has been reduced by 37 percent. The present version of the C-Class is nearly twice as efficient as its predecessor.

The E 220 CDI BlueEFFICIENCY Edition that is available from March 2012 is simply one of the most economical cars in its segment. Thanks to a bundle of efficiency-boosting measures, including an Aerodynamics package, electric power steering (EPS), a longer final-drive ratio and size 205/55 R 16 tyres with low rolling resistance, the model emits just 119 g CO2/km – ten grams or nearly eight percent less than before and equates to 4.5 litres of diesel per 100 km. The E 220 CDI BlueEFFICIENCY Edition has an output of 125 kW (170 hp) and is available with a 6-speed manual transmission only.

The turbocharged 1.6-litre four-cylinder petrol unit is the brand new entry-level engine for the C-Class. With fuel consumption of 5.8 l/100 km and a CO2 figure of 136 g/km, the improvement compared to the previous C 180 when similarly equipped is as much as 21 g/km, or just under 1 l/100 km. This makes the C 180 BlueEFFICIENCY one of the very first petrol models to be ranked in energy efficiency class B. The 115 kW (156 hp) engine is very light when compared to its competitors and delivers impressive agility from standstill – peak torque of 250 Nm is on tap from just 1250 rpm all the way up to 4000 rpm.

CL "Grand Edition": exclusive luxury

The exclusive "Grand Edition" of the CL from Mercedes-Benz features attractive exterior paint finishes and more exclusive interior appointments. The range of paint finishes offers a choice between designo platinum black metallic, designo magno cashmere white and designo mocha black. The exclusive appearance is rounded off by 20-inch light-alloy wheels. Inside, the "Grand Edition" offers single-tone aniline leather in porcelain, armagnac or deep black. The "Grand Edition" is available as a CL 500, CL 500 4MATIC and CL 600.

Viano PEARL Limited Edition: exclusive touring van

The vision presented at the Frankfurt International Motor Show has now become reality in the form of the Viano PEARL touring van, which indulges its occupants with the finest materials. The front seats and the four individual seats in the rear are upholstered in finest two-tone nappa leather, for example, and the rear boasts a real walnut floor. The electrochromatic glass of the rear side windows can be darkened at the touch of a button. A "BeoSound Viano" sound system from Bang & Olufsen, produced and tuned specifically for the Viano PEARL Limited Edition, provides for superior on-board audio quality. There is a choice of two powerful V6 engines – a diesel rated at 165 kW (224 hp) and a petrol version rated at 190 kW (258 hp).

Vito E-CELL crewbus: first seven-seater with electric drive

The Vito E-CELL crewbus is the first seven-seater vehicle worldwide to offer local emission-free mobility ex-factory as standard. With its range of around 130 km it is ideal for use in environmentally sensitive areas, such as pedestrian zones, city centres or health resorts. The electric motor (60 kW, 280 Nm), power electronics, transformer and AC/DC charger are accommodated under the bonnet. The generated power is transmitted to the front wheels. The powerful and robust lithium-ion batteries are accommodated under the passenger compartment floor.

Credits: Daimler AG

Copyright © 2012, Mercedes-Benz-Blog. All rights reserved.

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Mercedes-Benz E 300 BlueTEC HYBRID: The world's most economical luxury-class model

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The new E 300 BlueTEC HYBRID is all set for its market launch with record efficiency values of 4.2 l diesel/100 km and 109 g CO2/km, accompanied by increased torque and power output. Its modular hybrid concept with lithium-ion battery does not impose any compromises on space and offers an impressive driving experience thanks to start/stop, recuperation, boost effect, all-electric driving and sailing. The new model is available as a saloon and an estate. The E 300 BlueTEC HYBRID is the world's most fuel-efficient model in the luxury segment.


Mercedes-Benz is opening a new chapter in its brand's core segment and at the same time setting new standards for luxury-class business vehicles: the E 300 BlueTEC HYBRID, which is available as a saloon and an estate, boasts truly impressive performance. The 4-cylinder diesel engine of the E 300 BlueTEC HYBRID is rated at 150 kW (204 hp) and 500 Nm. The diesel engine combines with an electric motor rated at 20 kW and 250 Nm to produce a harmonious overall concept.

"The E 300 BlueTEC HYBRID represents the continuation of our comprehensive hybrid offensive. The modular technology paves the way for us to quickly introduce hybrid models to complement other model series," explains Professor Thomas Weber, Daimler Board Member for Group Research and Head of Mercedes-Benz Cars Development. "By clearly focussing on the different requirements of the global markets, we are able to offer precisely the models that our customers want."

The new model does not force passengers to compromise in terms of spaciousness, either in the interior or in the luggage compartment. The intelligent, modular hybrid concept represents a comprehensive enhancement of the S 400 HYBRID – the clear market leader in its segment: no body modifications are necessary, the hybrid module is flexible and also suitable for deployment in other model series. All this comes at only a moderate price increase of € 3570. In Germany the E 300 BlueTEC HYBRID costs € 51,794.75 as a saloon, while the estate model retails at € 55,007.75 (in each case incl. 19% VAT). Both models are to be launched in June 2012.

The philosophy: enhanced efficiency without compromising on comfort or benefits

The E 300 BlueTEC HYBRID forms part of the brand's intelligent downsizing strategy, which involves making conventional models far more efficient than previously – without sacrificing driveability or comfort.Here the in-house engineers have their sights set on exemplary consumption figures in everyday traffic rather than on standard or NEDC combined consumption, for instance. The familiar "Real Life Safety" philosophy, which focuses on safety benefits under real-life conditions rather than standardised crash-test results, is augmented by "Real Life Efficiency".

The E 300 BlueTEC HYBRID is based on the notoriously economical E 250 CDI, yet has a higher output and 15 percent lower fuel consumption.Overview of the E 300 BlueTEC HYBRID:
On the road, therefore, the E 300 BlueTEC HYBRID is easily a match for the E 300 CDI (170 kW/540 Nm), yet it boasts around 35-percent 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.

At the same time, hybridisation enhances ride comfort:the car starts and moves off in virtual silence, while the hybrid module also damps any internal combustion engine vibrations. What's more, complete climate control is available even in start/stop mode.

Coasting along the motorway

Mercedes-Benz hybrid technology offers a wealth of extra functions that enhance both comfort and efficiency as well as helping to deliver a special driving experience underpinned by accomplished sportiness:

- When the car is stationary - ECO start/stop: the internal combustion engine switches off when coasting at speeds up to 160 km/h, since ancillaries such as the steering, brakes and refrigerant compressor operate electrically. It is restarted quickly, smoothly and virtually silently.

- Manoeuvring: in most cases, the car uses electric power alone for manoeuvring and parking.

- Accelerating: 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 available instantaneously.

- Boost function: the electric motor supports the combustion engine during acceleration, e.g. in the course of overtaking.

- Cruising: when the car is being driven at a constant speed, the engine control unit shifts the operating points towards exceptionally low specific fuel consumption levels.

- Sailing "sailing", as it has come to be known, 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.

- Kinetic energy recuperation when coasting or braking: when the car is coasting (decelerating), the electric motor acts as a generator. When the brake pedal is pressed, the generator output is initially increased proportionally for greater deceleration. Only when increased brake pressure is applied are the wheel brakes additionally deployed.

- Information: an additional savings effect arises after a relatively short period of time, as drivers come to apply the above-stated functions in an increasingly more purposeful and effective manner. They are supported here by the display concept in the hybrid models – the central display provides information on the current energy flow and the charge status of the battery.

The hybrid module: a compact and intelligently integrated powerhouse

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.Distinguishing features include the 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 marginally more space than the 7G-TRONIC (+65 mm). 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 Newton metres at an operating voltage of 120 volts.

The components: perfectly integrated into the vehicle

The hybrid drive's electrical energy is provided by the high-voltage lithium-ion battery specially developed for use in vehicles.Its key characteristics include an output of 19 kW and an energy content of 0.8 kWh, allowing the E-Class to run on electric power alone at up to 35 km/h and for up to one kilometre. Space-saving installation of the drive in the engine compartment in place of the conventional starter battery means that the generous 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.

Sophisticated packaging means that numerous hybrid-specific components such as the high-performance electronics in the engine compartment can be integrated directly with the internal combustion engine, thus neatly rounding off the modularity concept:the hybrid models can be produced on the same assembly line as their conventional counterparts without needing to be diverted elsewhere. Another advantage of the overall concept is the scalability and compatibility with other vehicles and engines.

Safety: on a par with previous models

Intelligent integration of the hybrid systems without the need for changes to the body has the practical benefit of not restricting spaciousness in any way as well as ensuring that all hybrid models boast exactly the same high level of safety as their counterparts with an internal combustion engine – a very important aspect for Mercedes-Benz. Accident behaviour has been successfully tested crash simulations and tests.





















Credits: Daimler AG

Copyright © 2012, Mercedes-Benz-Blog. All rights reserved.

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Hybrid bus for Munich district

By | Published Monday, 26 September 2011


Presumably on the basis of the positive results from the first hybrid bus deployed in the Munich administrative district, the Munich Regional Transport vehicle fleet now also includes a Mercedes-Benz Citaro G BlueTec Hybrid Omnibus. The handover of the vehicle for its intended use took place on 22 September 2011, when Ulrich Piotrowski, the Market Launch Manager for Mercedes-Benz hybrid and electric buses, presented a symbolic key to Jörg Schuchtmann, the Operations Manager of Busservice Watzinger GmbH & Co. KG.


The Citaro is part of a new pilot project in the “Munich District Energy Vision” initiative, aimed at reducing the district’s energy consumption by 60 percent by the year 2050, and meeting the 40-percent demand with renewable forms of energy. Passenger public transport is also one of the modules in the overall emissions balance, so this too is an area for research and incentives. On the basis of favourable past experience, the Munich administrative district has now decided to subsidise more hybrid buses and carry out a long-term test on them. According to Ulrich Piotrowski: “In terms of exhaust emissions and noise reduction, hybrid as an eco-friendly drive technology stands out as the best option at the moment, because of its practical advantages and high level of electrification.”

Deployment on a particularly difficult route

The Mercedes-Benz Citaro G BlueTec Hybrid will be used on one of the operator’s most important routes, number 266, running between the Planegg suburban railway station and the Grosshadern hospital. This route will be an effective showcase for the benefits of the new sustainable technology. “A dense network of bus stops, the central business district nearby and high passenger use provide ideal conditions to test and raise the public profile of the pioneering technology of these vehicles. The hybrid bus will now allow an almost noiseless and emissions-free service in the vicinity of the hospital,” said a delighted Jörg Schuchtmann.

Mercedes-Benz Citaro G BlueTec Hybrid

The Citaro G BlueTec Hybrid is at present the only hybrid bus with capability to complete a distance of up to ten kilometres on electricity only, given ideal topographical conditions. In this case, the familiar rumble of the diesel engine is not heard at all. The bus pulls up silently at the bus stop, and continues in the same fashion for several more stops along the route. The drive system consists of four electric hub motors, which draw their current from one of the world’s largest in-vehicle lithium-ion batteries.

This current is generated from braking manoeuvres, or also where necessary via a generator driven by the diesel engine, which is a comparatively small unit for this vehicle class. Experts refer to this as “serial hybrid drive” technology. Diesel fuel savings, and the associated reduction in CO2 emissions, are around 20 percent.

High tech in a proven vehicle design

This sophisticated diesel-electric hybrid design concept has been implemented in the proven articulated version of the most successful city bus family worldwide, the Mercedes-Benz Citaro. From the outside, it is difficult to tell the vehicle apart from a conventional diesel bus, except for the higher roof structure to accommodate the battery. But travelling in the bus is a very different experience: the four electric motors rapidly accelerate the 18-metre-long bus virtually silently, and with no jerks or jolting (because there is no transmission). The motors are fitted close to the wheel hubs on the middle and rear axles, together providing total drive power of 320 kW, supplied where necessary from both the battery and the generator operated by the diesel engine. These electric motors are also used for braking purposes, operating as generators, or like the dynamo device familiar to cyclists, to convert the energy braking into electrical current for the battery. The diesel engine is automatically activated to provide supplementary current whenever additional demand is indicated by the battery. In comparison with a straight diesel bus, the internal combustion engine is only half the size in total, weighing just 450 kg instead of 1000 kg, and with a displacement of only 4.8 litres as compared with 12 litres. Output is approximately one third lower, at 160 kW.

One of the world’s largest in-vehicle lithium-ion batteries

The energy storage device used in the new Mercedes-Benz Citaro G BlueTec Hybrid is a lithium-ion battery that is the first to provide a power rating of this order of magnitude. The battery system delivers a maximum of 240 kW, and it is also relatively light, weighing less than 350 kg. Key advantages over conventional battery systems include a higher energy density, higher storage capacity and low weight. By way of comparison, the hybrid buses on trial in Stuttgart three decades ago had lead batteries on board, weighing as much as 3000 kg.

Lithium-ion batteries first became commercially available in 1991. This technology is now used in almost all situations where there is a high energy demand and low weight: mobile telephones, digital cameras, camcorders, notebooks, etc. They have been used only relatively recently in large vehicles such as passenger cars, trucks and buses. Daimler already has experience with the use of lithium-ion batteries in buses. Over 1000 of the 3000 Orion hybrid buses are now running on lithium-ion batteries produced by the same manufacturer. Orion is a Daimler AG brand in the USA and a world leader in hybrid buses. It also supplies the battery system for the new Mercedes-Benz Citaro G BlueTec Hybrid. The output delivered by this system is equivalent to that of around 9000 large laptop batteries.

Busservice Watzinger GmbH & Co. KG

The Watzinger bus company has a total workforce of 347 employees, making it one of Bavaria’s largest. The company has depots in Munich, Bad Abbach, Siegenburg and Regensburg, and transports a total of approximately 18.7 million passengers each year. Its fleet of 159 state-of-the-art buses cover a total distance of 8.4 million kilometres per year.

Source: Daimler AG

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REPORT: Mercedes-Benz bids farewell to the ML 450 HYBRID

By | Published Wednesday, 21 September 2011


Latest inside information points to the decision taken by Stuttgart executives to cancel the production of the ML 450 HYBRID by the end of 2011, after a short, three-year lifespan.


The SUV was using a complex, two-mode hybrid unit developed in cooperation with GM, Chrysler and BMW, offering 279 hp for the V6 petrol engine and 45 kW stored in the nickel-metal battery. However, the agreement between the four companies ended in 2009 and, for 2012, the solely remaining vehicles equipped with this hybrid system will be those produced by GM, as BMW recently announced its X6 ActiveHybrid has been axed from next year's model offer. The main reasons for discontinuing the ML 450 HYBRID were the high cost of the two-mode powering system (around 20,000 $), the levels of efficiency and performance which never met the expectations and the rather sluggish sales numbers, given the initial targets were never actually achieved. Moreover, it looks that there won't be any hybrid version in 2012 for the new generation of the M-Class. But that does not mean Mercedes-Benz is not eyeing a future hybrid variant for the ML, which might hopefully be superior to the outgoing model in all categories.

Copyright © 2011, Mercedes-Benz-Blog. All rights reserved.

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World Debut at the 2011 IAA Frankfurt: The BRABUS Technology Project HYBRID

By | Published Sunday, 11 September 2011


BRABUS combines the best of two worlds, an efficient direct-injection diesel with BRABUS ECO tuning and two electric wheel hub motors, in a world debut at the 2011 Frankfurt Motor Show IAA. The project vehicle HYBRID was developed by the BRABUS ZERO EMISSION business division, which works on alternative drive technologies, in cooperation with the German Federal Ministry for the Environment, Nature Conservation and Nuclear Safety. This car is an innovative hybrid version of the Mercedes E 220 CDI BlueEFFICIENCY known for its outstanding fuel economy ex-factory. The project vehicle has been developed to small-series-production maturity.


The BRABUS development engineers have adapted two supplemental wheel hub motors from English manufacturer Protean ELECTRIC to the rear axle of the E-Class sedan.

These alternative drives, which in Eco mode each produce 50 kW of continuous power and 80 kW in Sport mode, are designed to fit in the BRABUS Monoblock Q 19-inch wheels.

With a combined peak power output of 160 kW and a total peak torque of 1,600 Nm (1,180 lb-ft) the two electric motors supplement the existing 2.2-liter common-rail turbodiesel engine, which was equipped with a BRABUS ECO PowerXtra D3 (V) performance kit. This tuning kit consists of an auxiliary control unit that features engine mapping developed on state-of-the-art engine test benches for optimizing fuel economy and CO2 emissions.

The objective of this measure was less the power increase by 30 hp (29 bhp / 22 kW) to 200 hp (197 bhp / 147 kW) produced by the plug-and-play module. Much more important is the increase in peak torque from standard 400 to 450 Nm (295 to 332 lb-ft). It gives the vehicle even more pulling power, regardless of whether the vehicle is in hybrid or conventional operating mode, and results in better fuel economy and reduced CO2 emissions.

The two wheel hub motors turn the four-door car into the even more fuel efficient and ecofriendly BRABUS HYBRID. The various operating modes can be preselected from the cockpit.

During all-electric operation the car is powered by an 18.6-kWh lithium-ion battery pack housed in a custom-made well in the underbody. It gives the BRABUS HYBRID in all-electric Eco mode a maximum operating range of 120 kilometers (75 miles) without any CO2 emissions. Even in Sport mode the car has an all-electric range of 80 kilometers (50 miles), which easily meets the requirements of the majority of motorists who on average drive less than 60 kilometers (37 miles) a day.

During all-electric operation the batteries are charged by energy recuperation. While coasting or braking the system reaches a maximum recuperation power of 140 kW. For charging at home with ecofriendly eco electricity the use of the car charger from German energy provider RWE is recommended. It can recharge the battery pack with a current of 380 volts and a charging capacity of 50 kW in 30 minutes. On the road the batteries can be recharged with the on-board charger on any standard 220 V AC outlet or on a 380 V three-phase power supply.

In hybrid mode, the 200 hp (197 bhp) / 147 kW of the diesel engine and the maximum 160 kW of the electric drive in Sport mode work together in highly efficient fashion. Acceleration time for 0 - 100 km/h (62 mph) improves from standard 8.7 to 7.4 seconds.

Despite of the added weight of 255 kilograms (562 lbs.) compared to a stock E 220 CDI, the BRABUS HYBRID also shines in the area of pulling power thanks to its supplemental electric drive: the intermediate sprint from 60 to 120 km/h (37 to 74 mph) now only takes 5.6 seconds.

At the same time the combination with the electric motors eases the load on the combustion engine, significantly reducing fuel consumption and CO2 emissions further. Naturally drivers have the option to operate solely in diesel mode. In this case the batteries can also be recharged by the wheel hub motors which also function as alternators.

The work of the BRABUS development team was not limited to the integration of the two electric motors for all-electric or hybrid operation alone.

The higher vehicle weight and the altered weight distribution resulting from the installation of the wheel hub motors and the batteries in the rear necessitated the development of a new suspension. A height-adjustable comfortable sports suspension with variable damper rates was developed in cooperation with technology partner BILSTEIN.

The tires are supplied by technology partners Continental, Pirelli and YOKOHAMA. They are mounted front and back in size 245/35 ZR 19 on BRABUS Monoblock Q alloy wheels with five double spokes.

The brakes are a BRABUS custom development as well. Special brake discs gripped by two calipers per wheel are attached to the rear of the wheel hub motors on the rear axle. All standard driver assist systems such as ABS and Brake Assist are retained.

The BRABUS front fascia, manufactured like all body components in OEM quality from high-grade Pur-R-Rim plastics, is designed to replace the production bumper in its entirety. Its sophisticated shape reduces lift on the front axle and also lends the sedan an even more striking nose. An innovative lighting concept with economical LED daytime running lights furthermore optimizes active safety.

BRABUS front aluminum sport fenders emphasize the sporty appearance of the concept car. BRABUS side skirts give the sedan a longer, sleeker appearance. Integrated LED entrance lights ensure safe entering and exiting of the vehicle in the dark. A blue-backlit BRABUS logo is integrated into each sill and activated together with the entrance lights.

BRABUS aluminum pedals and footrest add sporty highlights to the interior. A newly developed instrument cluster provides information about the state of charge of the battery pack. A control panel in the cockpit gives drivers the option to select all-electric mode, hybrid operation or diesel engine only.


BRABUS Technology Project HYBRID

Technical Data


Body

Four-door sedan based on the Mercedes-Benz W 212 series E-Class (E 220 CDI BlueEFFICIENCY).

Steel unibody with mounts for lithium-ion batteries in the trunk. BRABUS aerodynamic-enhancement kit with front fascia, air vents in the front fenders, side skirts, rear spoiler lip and rear diffuser.


Dimensions

Length: 4.868 mm (191.6 in)
Width: 1.841 mm (72.4 in)
Height: 1.464 mm (57.6 in)
Curb weight: 1,990 kg (4,387 lbs.)


Electric Drive

Two electronically controlled Protean ELECTRIC wheel hub motors on the rear axle and 18.6 kWh lithium-ion battery pack. Charging by external or on-board charger.

Peak power in Sport mode: 2 x 80 kW = 160 kW system power
Continuous power in Eco mode: 2 x 50 kW = 100 kW system power
Maximum recuperation power: 2 x 70 kW = 140 kW total recuperation power
Peak torque: 2 x 800 Nm (590 lb-ft) = 1,600 Nm (1,180 lb-ft) system torque
Maximum rpm: 2,000

CO2 emissions: 0 g/km

Power supply: Lithium-ion (LiCoMn) battery pack
Nominal voltage: 355 V
Capacity: 18.6 kWh

External charger: BRABUS RWE car charger, 380 V three-phase current
Charging capacity: 50 kW (limited)
Charging time: 0.5 hours (limited)

Internal charger: Brusa one-phase on-board charger, 220 V AC or 380 V three-phase current
Charging capacity: 3.3 kW (limited)
Charging time: 5.6 hours


Engine

2.2-liter common-rail turbodiesel engine; based on Mercedes E 220 CDI BlueEFFICIENCY; with BRABUS PowerXtra D3 (V) performance kit.

4-cylinder 4-valve alloy engine with one turbocharger
Displacement: 2,134 cm³ (130.2 cu. in.)
Compression ratio: 16.2 : 1
Rated power output: 200 hp (197 bhp) / 147 kW at 3,000 – 4,200 rpm
Peak torque: 450 Nm (332 lb-ft) from 1,400 rpm
CO2 emissions in diesel operation: 130 - 139 g/km (208 – 224 g/mile)
Fuel type: diesel
Motor oil: ARAL


Power Transfer

Rear-wheel drive with ESP and supplemental electric drive by two electric wheel hub motors on the rear axle

Six-speed manual gearbox for the diesel engine


Suspension

Independent front and rear suspension with height-adjustable BRABUS coilover sport suspension.

Front axle:
Three-link suspension, anti-dive geometry. Height-adjustable BRABUS struts with gas-pressure shocks with 10-way adjustable bound and rebound, and coil springs.

Rear axle:
Multi-link suspension, anti-dive and anti-squat geometry. Height-adjustable BRABUS struts with gas-pressure shocks with 10-way adjustable bound and rebound, and coil springs.

Wheels:
BRABUS Monoblock Q 8.5J x 19 H2 alloy wheels with Continental, Pirelli or YOKOHAMA high-performance brake system.
Front: 8.5J x 19 H2 with 245/35 ZR 19
Rear: 8.5J x 19 H2 with 245/35 ZR 19


Brake System

Dual-circuit brake system with BRABUS high-performance brake system assisted by the wheel hub motors on the rear axle.


Performance

0 - 100 km/h (62 mph): 7.4 sec.
60 - 120 km/h (37 – 74 mph): 5.6 sec.

Top speed Eco mode: 190 km/h (118 mph)
Top speed Sport mode: 220 km/h (137 mph)


Energy Consumption and Operating Range

Electric Mode:

Energy consumption of the
electric motors based on NEDC
incl. recuperation: 0.19 kWh/km (0.30 kWh/mile)

Operating range based on NEDC: 80 km (50 miles)
Operating range at a constant 100 km/h (62 mph): 120 km (75 miles)

Price

Prototype not for sale























* Official photos and details courtesy of BRABUS GmbH *

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