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BMW X5 Hybrid: Vision EfficientDynamics - Unique low fuel consumption

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BMW X5 Hybrid: Vision EfficientDynamics
Unique low fuel consumption
Battery with high storage capacity
Power basis: BMW diesel engines
Solar roof and Aero-rims
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Unique: a large SAV with 165kW and an average fuel consumption of 6.5 litres per 100 kilometres.
The harmonious overall concept on which the concept study BMW Vision EfficientDynamics is based is just as impressive as the variety of individual measures it includes. All components have been carefully harmonised with one another and go together to form a fascinating, trend-setting whole. Based on the successful Sports Activity Vehicle BMW X5, a concept study has been created which demonstrates the unique potential of BMW EfficientDynamics on a whole new scale. The big SAV model provides generous and versatile space. Its superior chassis technology and the intelligent all-wheel drive system BMW xDrive ensure it offers outstanding agility and supreme driving properties over all terrains.
By combining BMW ActiveHybrid Technology with a highly efficient 4-cylinder diesel engine which has an outstanding output of 150kW/204bhp, these qualities can be realised at a level of fuel consumption and exhaust emissions which is exemplary. The concept car BMW Vision EfficientDynamics fulfils the requirements of a large SAV in the premium segment in terms of driving pleasure, space and comfort. With a total output of 165 kW, an acceleration rate of 0–100 km/h in 8.9 seconds, an average fuel consumption in the EU test cycle of 6.5 litres per 100 kilometres and a CO2 emissions level of 172 grams per kilometre, it offers a balance between driving dynamics and economy which is unique in this vehicle category.

BMW ActiveHybrid generates more electrical energy from less fuel.
The technology applied in the concept car BMW Vision EfficientDynamics aims to support the combustion engine in generating dynamic performance as well as operating as many vehicle functions as possible electrically by producing the electrical power required by means of Brake Energy Regeneration. Both functions are performed by the generator, compactly and safely integrated in the transmission casing, with an output of 15 kW and a maximum torque of 210 Nm. Under load it provides additional drive torque which results in a perceptibly more spontaneous response in start-up situations. This further intensifies the power delivery of the diesel engine with Variable Twin Turbo – which is already quick in response. The support provided by the generator gives the 4-cylinder engine the drive characteristics appropriate to a BMW X5.
During trailing throttle and braking phases, the generator feeds the electrical power it produces to the lithium-ion battery via the high-power electronic system system, which is likewise fully integrated. This form of Brake Energy Regeneration represents a consistent further development of the principle which has already been applied to BMW serial production models. Brake Energy Regeneration generates electricity for the vehicle power supply whenever it is available at no cost and does not impair driving dynamics. The generator integrated in the transmission casing provides a significantly more efficient form of power generation than a conventional generator which takes energy directly from the combustion engine and thus diminishes its efficiency. In terms of its own efficiency, too, BMW ActiveHybrid Technology is superior to a conventional generator: the energy efficiency achieved by means of Brake Energy Regeneration is about ten times greater than with a conventional generator.

Intelligent energy management with lithium-ion battery, AGM battery and two vehicle power systems.
The additional energy can only be used if it can be fed to a battery in varying rhythms and is available there as dictated by needs, regardless of individual driving style. Furthermore, the storage capacity has to be at a high level so that lengthier distances without trailing throttle and braking phases can be dealt with without a supply shortfall occurring. In serial production vehicles which are fitted with Brake Energy Regeneration, BMW uses AGM (Absorbent Glass Matt) batteries for this reason since they can cope with frequent and irregular charge and discharge cycles without loss of power.
Another step forward in development is the use of lithium-ion batteries in this vehicle. In many other areas of application – for example in mobile phones and laptops – this type of battery has long demonstrated its high storage capacity and cycle resilience. The lithium-ion battery used in the concept car BMW Vision EfficientDynamics shows a perspective for the use of this technology under the particular demanding conditions which apply to a motor vehicle. The lithium-ion battery is placed directly adjacent to the AGM starter battery under the luggage compartment cover of the Sports Activity Vehicle, as is appropriate to the overall package. The two batteries occupy approximately equal space here.
In order to ensure that energy management is as needs-oriented and efficient as possible, the concept car BMW Vision EfficientDynamics is fitted with two parallel vehicle power systems. In addition to the conventional 12 volt system supplied by the AGM starter battery there is also an innovative 120 volt system which is fed by electrical power from the generator and supplies electrical consumers from the lithium-ion battery.

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