Performance-oriented petrol-electric set-up develops over 670bhp and could be used in future Rolls-Royce models, including the firm's planned SUV
26 November 2014

BMW has revealed an advanced new plug-in hybrid system, dubbed Power eDrive.

The new system forms part of an extended range of modular hybrid powertrains being developed in a performance-based EfficientDynamics engineering program at BMW’s research and development centre in Munich. 

It's envisaged for launch on various BMW Group production models in what BMW describes as “upmarket segments”. The unveiling brings closer to reality the prospect of a four-cylinder petrol and twin electric motor-powered model from Rolls-Royce. Such a model would be capable of impressive straight-line performance and increased range.

The new hybrid system aims to provide the sort of smooth yet urgent step-off performance qualities delivered by a contemporary battery-powered electric drive systems – like that offered in the Telsa Model S

An overall range of over 370 miles is quoted, with some 62 miles managed on electric power alone thanks to a range extender function.

Revealed in a 5-series GT-bodied prototype, the most powerful of BMW’s new modular hybrid powertrains uses its new 228bhp turbocharged 2.0-litre, four-cylinder petrol engine in combination with two electric motors. 

Those motors are a modified version of the i3's synchronous unit. A 201bhp motor is mounted up front in the space usually taken up by the torque converter in the car's eight-speed automatic transmission, while another, developing 268bhp, is mounted within the rear axle assembly.

In total, the system is claimed to produce over 670bhp, along with a torque loading beyond 750lb ft – figures that easily top the 453bhp and 530lb ft of the existing naturally aspirated 6.8-litre V12 used by the 11-year-old Rolls-Royce Phantom.

The principle behind BMW’s Power eDrive system is a maximisation of electric motor performance. “The electric motors provide approximately two-thirds of the combined output, with the combustion engine accounting for the remaining third,” said Franz Drescher-Kaden, BMW concept engineer for the new petrol-electric hybrid set-up.

Energy for the electric motors is provided by a 20kWh lithium ion battery mounted both longitudinally in the rear of the 5-series GT’s centre tunnel and horizontally underneath the rear seat in a space ahead of the rear axle. 

It can be charged both via plug-in means and on the run using the combustion engine in a steady state mode. The fuel tank has been reduced in size from a standard 70 litres to 30 litres.

As well as acting as a generator to produce electricity, the Power eDrive hybrid system’s petrol engine can also provide a performance boost with direct drive to the front wheels during kickdown, in which all three power sources are used for propulsion.

Drive is nominally channelled to the rear wheels via the rear electric motor, whose reserves are sent through a multi-speed gearbox. 

The introduction of the front electric motor, which operates via the eight-speed automatic in which it is housed, provides all-electric four-wheel drive. This is further enhanced by the combustion engine, which also delivers its power to the front wheels.

BMW has not revealed a weight figure for its new hybrid system. However, it does concede that the addition of two electric motors, as well as the lithium ion battery pack and ancillary electronic management system, adds handsomely to the kerb weight. 

Despite this, BMW says the straight-line performance of its 5-series GT Power eDrive prototype exceeds that of the 444bhp twin-turbocharged 4.4-litre V8 550i GT, which tips the scales at 2070kg.

Power eDrive is being developed as developed as a scalable system with power outputs ranging from 250bhp to over 650bhp, according to BMW, which says the plug-in hybrid technology will be “a natural choice for use in upmarket vehicle segments”.

Among the new models thought to be in line to run the new petrol-electric system are future incarnations of the Rolls-Royce Ghost and Phantom as well as the firm's planned SUV – currently undergoing conceptual development.

BMW has also indicated Power eDrive could be offered alongside traditional petrol and diesel engine options in its upcoming X7 – a new range-topping SUV due for launch in 2017, as well as the next-generation 7-series, X5 and X6.  

Read Autocar's first drive in the new 3-series eDrive prototype

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Comments
13

26 November 2014
they've found a use for that godawful 5 series GT...

26 November 2014
Autocar wrote:
BMW says the straight-line performance of its 5-series GT Power eDrive prototype exceeds that of the 444bhp twin-turbocharged 4.4-litre V8 550i GT, which tips the scales at 2070kg.
BMW would do well to put more effort into making their cars lighter, to improve performance and economy.

 

I'm a disillusioned former Citroëniste.

1 December 2014
BMW made much of the i3 bodywork of some sort of carbon fibre-reinforced plastic with the intention to make it lighter.

27 November 2014
So you buy the edrive as shown on this page and then in the same breath they tell you there is one twice as good coming. Shoot yourself in the foot takes on a new German meaning - like Zeee Ripoff!!!

what's life without imagination

1 December 2014
But they haven't told you yet the selling price of each.

27 November 2014
In the Blue Corner from Germany - the heavyweight champion of the world Be Em Doubleyou In the Green corner the upstart from the flag waving United States of America..Tesla 2015 Tesla Model S 85 Hate to say it - but the yanks have you thrashed in all rounds But good to see a proper fight - perhaps Autcar would be kind enough to do a serious one week thrashout between these two future cars which are beginning to grow on even petrolheads like me..because they seriously GO..... and very quietly too :-)))

what's life without imagination

27 November 2014
This sounds like an interesting system although the 4 pot generator would have to be very well insulated for a Rolls Royce. I'm not sure how many customers would be happy hearing such a humdrum noise coming out of their Phantom. Speaking of the Phantom, that has a normally aspirated V12, the Wraith and Ghost get the twin-turbo lump which is 'only' 6.6 litres. I'll put my anorak away now....

27 November 2014
Amazing how motoring nirvanna comes along,and then turns out to be not that good at all,plus,if this good,it will be stuck in a luxury car.

Peter Cavellini.

27 November 2014
BMW wrote:
“The electric motors provide approximately two-thirds of the combined output.."
But only 16% of the range.


27 November 2014
bomb wrote:
BMW wrote:
“The electric motors provide approximately two-thirds of the combined output.."
But only 16% of the range.
And at 10% of fuel cost

 

Hydrogen cars just went POP

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