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Στην διοργάνωση Group Innovation Days 2014, η BMW βρήκε την ευκαιρία και παρουσίασε επίσημα μία πρωτότυπη 3-Series plug-in hybrid.

Το μοντέλο, βασίζεται στο επερχόμενο facelift της 3άρας –γι’ αυτό και είναι καμουφλαρισμένο– με τις σημαντικότερες αλλαγές όμως να εντοπίζονται στα μηχανικά. Η ισχύς, παρέχεται από έναν υπερτροφοδοτούμενο, δίλιτρο TwinPower Turbo βενζινοκινητήρα που συνδυάζεται με έναν ηλεκτροκινητήρα για να παράγει 245 άλογα και 400 Nm ροπής. Για την μετάδοση της ιπποδύναμης, χρησιμοποιείται ένα 8-τάχυτο Steptronic, αυτόματο κιβώτιο.

BMW 3-Series plug-in hybrid prototype 35

Η BMW δεν ανακοίνωσε τις επιδόσεις της plug-in υβριδικής 3-Series και αρκέστηκε στο να πει πως είναι στο ίδιο επίπεδο με αυτές μίας 6-κύλινδρης 3-Series. Όσον αφορά στην κατανάλωση, η υβριδική 3άρα καταναλώνει κατά μέσο όρο μόλις 2 λίτρα καυσίμου ανά 100 χιλιόμετρα, εκπέμποντας μόλις 50 gr CO2 ανά χιλιόμετρο. Μπορεί επίσης να κινηθεί για 35 χιλιόμετρα χρησιμοποιώντας μόνο ηλεκτρική ενέργεια. Σε αυτή την περίπτωση, η τελική της είναι 120 km/h. Περισσότερες πληροφορίες μπορείς να διαβάσεις στο δελτίο τύπου που ακολουθεί.

BMW 3-Series plug-in hybrid prototype 16

Δελτίο Τύπου

New generation of plug-in hybrid models

Munich/Miramas. The BMW Group is preparing to follow up its innovative and revolutionary BMW i models with plug-in hybrid versions of the core-brand models. In Miramas, France, it will present a BMW 3 Series plug-in hybrid prototype and a new generation of hybrid vehicle concepts incorporating technology already used in BMW i models. Long term, the BMW Group is planning to offer plug-in hybrid versions of all its core-brand models.

Herbert Diess, Member of the Board of Management BMW AG, Development, said: “All BMW Group models benefit from BMW i. The fundamental technology involved in battery cells, electric motors and the power electronics will be used in our upcoming plug-in hybrid models. When it comes to the electrification of the drivetrain, we are deliberately developing a wide-ranging expertise in order to offer our customers worldwide the ideal solution.

The plug-in hybrid models presented in Miramas are equipped with a highly efficient internal combustion engine and an electric motor powered by an externally rechargeable high-voltage battery. Shorter-distance urban trips or commutes can be completed on electric power only. On longer journeys, the vehicle will usually operate in “combined mode”, with both systems working together.

The BMW 3 Series plug-in hybrid prototype combines a four-cylinder petrol engine with an electric motor. The internal combustion engine is based on the TwinPower Turbo four-cylinder petrol engine that has already twice been voted “International Engine of the Year”.

The electric motor and power electronics are directly based on the BMW eDrive technology already used in the BMW i3 and BMW i8 models. The prototype’s lithium-ion battery, including the battery management system and the high-efficiency direct cooling system, are likewise based on BMW i experience and know-how.

The plug-in hybrid technology is so flexible that it can be integrated in a wide variety of vehicle concepts. It will therefore be possible to deploy it rapidly across the BMW model range. The route to sustainable mobility in the future will be a multitrack one. The already efficient combustion engines will be even more economical. All-electric vehicles like the BMW i3 are tailored to urban mobility requirements while plug-in hybrids are more appropriate for longer-distance journeys. Beyond this, in the long term electric mobility in conjunction with hydrogen fuel cell technology could also be a viable option.

The focus of our Efficient Dynamics strategy is the electrification of the power train. This is an area in which we will continue to expand in the coming years. The plug-in technology will be one key lever to bring high performance vehicles well below 100 g / km CO2, while retaining the driving pleasure and driving dynamics of a BMW. We will also continue to develop fully electric mobility. Hydrogen fuel-cells will remain a key issue when it comes to drivetrain development, especially relating to its sustainable production.

Key eDrive technologies developed in-house

All the important eDrive technologies and components are developed in-house, and from next year they will all be built at the BMW plant in Dingolfing. This programme is set to create over 200 new jobs around electro-mobility at the BMW plant in Dingolfing. Many tens of millions of euros will be invested at this plant over the next five years.

“Our accumulated expertise guarantees us a competitive edge,” stated Harald Krüger, Member of the Board of Management of BMW AG, Production. “This can be seen not only in the performance data of the BMW electric motors but also in our highly efficient production process.”

Since the BMW Group expects to be building a wide range of electric drive components in the future, production will be organised around an intelligent eDrive component-sharing system. This means that one and the same production line will be able to build high-voltage battery modules not just for the BMW i8 but also for the future BMW X5 eDrive. In the case of complete battery packs, too, the new production lines will be designed for a flexible production mix: it will be possible to build battery packs for a number of different future models all on the same lines.

Highly electrified hybrids

With the ongoing development and refinement of hybrid drive systems under the EfficientDynamics programme, the aim is to maximise the amount of time the vehicles are able to spend in electric mode. To ensure that this increased electric operation goes hand in hand with typical BMW dynamic performance, everyday practicality and maximum long-distance capability, the BMW Group’s future hybrids will be “highly electrified”. Highlights of this future Power eDrive technology will include much more powerful electric motors and batteries with twice the capacity of present versions .

The drive systems used in these future hybrid systems will offer combined outputs in excess of 500 kW. Also, the capacity of the lithium-ion batteries – up to 20 kilowatt hours – will be greatly in excess of current hybrid systems . Coupled with an increased all-electric driving range of up to 100 kilometres (62 miles), this will make it possible to operate in locally emission-free pure-electric mode on virtually all day-to-day trips .

Outstanding flexibility, which means it can be integrated in a wide range of different vehicle concepts, makes rapid deployment of this plug-in hybrid drive technology in the BMW model range a feasible and realistic proposition. The BMW 3 Series plug-in hybrid prototype provides a first taste of the extra-efficient driving pleasure which the world’s most successful premium sedan will offer.

Combining a four-cylinder TwinPower Turbo petrol engine from the new Efficient Dynamics engine family with an electric motor, the BMW 3 Series plug-in hybrid prototype offers standards of sporty performance on a par with a conventionally powered BMW 3 Series six-cylinder model, combined with a significant reduction in fuel consumption. Its plug-in hybrid drive system has a combined output of approximately 245 hp and maximum combined torque of approximately 400 Newton metres (295 lb-ft). These figures, together with the substantial extra acceleration provided by the electric motor’s boost function, bring a sharp and intensely dynamic dimension to everyday motoring. Average fuel consumption and CO2 emissions are approximately 2 litres/100 km (140 mpg imp) and 50 g/km respectively. In all-electric mode, the prototype is capable of a top speed of 120 km/h (74.5 mph), and has a driving range of approximately 35 kilometres (22 miles).

Plug-in hybrid system in the BMW 3 Series Sedan: ideal platform, superior drive components, maximum efficiency.

The BMW 3 Series Sedan provides the ideal starting point for developing an exceptionally dynamic and fuel-efficient plug-in hybrid model. The conventional combustion-powered models already set standards in the mid-sized premium segment with their blend of sportiness and frugal fuel consumption. This is down to factors such as intelligent lightweight design, best-in-class aerodynamics and an extensive range of standard-specification BMW EfficientDynamics technologies. The internal combustion engine used in the BMW 3 Series plug-in hybrid prototype is based on a TwinPower Turbo four-cylinder petrol engine that has already twice been voted “International Engine of the Year”. Its hallmarks are sporty performance, smooth and refined running and exceptional efficiency. The plug-in hybrid prototype also features an electric motor and power electronics which are directly based on the BMW eDrive technology of the BMW i3 and BMW i8 models. The motor is powered by a lithium-ion battery which, together with the battery management system and high-efficiency direct cooling system, are likewise rooted in the experience and know-how amassed during development of the BMW i models. The battery can be recharged at any household power socket and is mounted in a particularly crash-safe position underneath the load compartment.

The power electronics form a single integrated system that drives the electric motor, via a liquid-cooled inverter, manages the energy flow from the high-voltage battery to the onboard electrical systems and provides centralised control of hybrid-specific functions. The drive torque from engine and electric motor is supplied to the rear wheels of the BMW 3 Series plug-in hybrid prototype via an 8-speed Steptronic transmission which – as on conventionally powered BMW models – makes its own additional contribution to the efficiency of the overall drive system.

Nowadays, the potential integration of a plug-in hybrid system is taken into account at all stages in the development of new models of the BMW and MINI brands. Amongst other things, this ensures that future hybrid versions offer the same level of practicality as the base models. For example, there is only a minimal reduction in boot space in the BMW 3 Series plug-in hybrid prototype compared with a conventionally powered BMW 3 Series Sedan, while the interior configuration possibilities – e.g. with the folding rear seatback – are unchanged. The simplicity with which the 8-speed Steptronic transmission can be integrated into the plug-in hybrid system is a further benefit of this flexible, forward-looking development strategy.

Intelligent energy management with adaptive powertrain control.

Like the current production models, the BMW 3 Series plug-in hybrid prototype is fitted with a Driving Experience Control switch, which is mounted on the centre console. This can be used to select different vehicle settings to suit varying requirements and situations. Three different modes are available: COMFORT, SPORT and ECO PRO mode. Each features different suspension settings, different shift characteristics for the 8-speed Steptronic transmission, and a different hybrid operating strategy.

In COMFORT mode, which perfectly balances comfort and efficiency on the one hand with typical BMW dynamic performance on the other, the electric motor’s control strategy is geared to relaxed, fuel-efficient driving. In tandem, the electric motor and internal combustion engine can also deliver high levels of power and performance when required. SPORT mode, meanwhile, is aimed at maximised performance, harnessing the full combined output of the engine and the electric motor. In this mode, engine and motor are both on stream at all times, ensuring instantaneous response to all accelerator commands. Finally, in ECO PRO mode, the accent is on harnessing the full efficiency potential of electrification. Intelligent hybrid functionality allows the electric motor and internal combustion engine to work in tandem to maximise overall system efficiency. Efficient energy management is enhanced by variable control of the electric comfort functions such as air conditioning, seat heating and exterior mirror heating, which always operate at the most appropriate power level. This likewise helps to maximise the vehicle’s range.

At the press of a button, the driver can choose between different plug-in hybrid modes. The MAX eDrive mode provides all-electric, zero-local-emission propulsion. Selecting the SAVE Battery mode keeps the battery at a constant state of charge. If the battery is less than 50 percent charged, the charge level is increased. In this way drivers can ensure they have enough power in reserve to operate in all-electric mode on a later, urban section of the journey.

The BMW 3 Series plug-in hybrid prototype also features a special hybrid-adapted Proactive Driving Assistant. Integrated in the navigation system, this system manages the powertrain not only with reference to current battery capacity but also to upcoming route profile, speed restrictions and traffic conditions.

This function marks the most extensive and advanced integration to date of BMW EfficientDynamics and BMW ConnectedDrive. Whenever the navigation system is in operation, the hybrid Proactive Driving Assistant collates all the available information about the upcoming route and relays this to the powertrain controller. This information comprises both static data from the interactive map, for example about speed restrictions and gradients, and also real-time information on current traffic conditions (Real Time Traffic Information – RTTI). The proactive energy management system then breaks the route down into its component parts, including low-speed sections, last-lap sections and gradients, before computing a proactive, route-specific strategy for managing the electric drive power right through to the specified destination.