BMW X5 Vision EfficientDynamics Concept

World premiere of the concept car BMW Vision EfficientDynamics, showing a further stage in the BMW EfficientDynamics development strategy. The first time a 4-cylinder diesel engine has been combined with BMW ActiveHybrid Technology in a large Sports Activity Vehicle.

The concept study based on a BMW X5 - even as a serial production model extremely efficient and dynamic - shows the unique potential of technology developed as part of the BMW EfficientDynamics program. It combines BMW's superior diesel expertise with the innovative BMW ActiveHybrid Technology. A further increase in efficiency is achieved by means of BMW EfficientDynamics measures in the environment of the combustion engine by optimizing energy flow and aerodynamics.

By intelligently combining a combustion engine and a generator as part of a Mild Hybrid concept, dynamic performance and efficiency are increased to an equal degree. With the extensive deployment of measures which are in some cases ready for serial production and were in some cases specially developed for this study, there is maximum utilisation of the potential of BMW EfficientDynamics for the reduction of fuel consumption and CO2 emission levels up to the limits of what is feasible within the BMW X5 vehicle segment. At the same time, the study clearly shows that any additional increase in efficiency over and above the highly efficient BMW vehicles already available today can only be achieved by means of an exponential increase in effort and expense.

The 2.0 litre 4-cylinder diesel engine with Variable Twin Turbo, common rail injection of the third generation and all-aluminium gearbox housing delivers 150 kW/204 bhp and generates a maximum torque of 400 Nm between 2,000 and 2,250 rpm. It is the first diesel in the world with a specific power output of over 100 bhp per litre of capacity.

BMW ActiveHybrid is based on a modular principle which allows the integration of the best possible components in differing concepts, according to the "Best of Hybrid" strategy. The components used in the BMW Vision EfficientDynamics study - Mild Hybrid and 4-cylinder diesel - harmonise just as perfectly as the combination of Full Hybrid and the 8-cylinder petrol engine in the BMW Concept X6 ActiveHybrid.

The innovative hybrid system of the concept study BMW Vision EfficientDynamics reflects the most sophisticated stage of development of intelligent energy management in the vehicle to date. In the Mild Hybrid concept, the generator contributes to vehicle acceleration with 15 kW and a maximum torque of 210 Nm. The total output of the vehicle is 165 kW. The hybrid technology thus increases the dynamic potential of the 4-cylinder diesel engine in way which is in keeping with the character of the BMW X5, as well as enabling the combination of a small engine with a large vehicle in the first place. What is more, the generator produces electricity to supply the power consumers in the vehicle by means of Brake Energy Regeneration. This minimises the direct conversion of fuel into electrical energy and maximises the drive torque available for conversion into driving dynamics.

Power generation: the compact generator, integrated in the gearbox housing, replaces a conventional generator powered directly by the engine. Electrical energy is produced by Brake Energy Regeneration with a unique degree of efficiency without impairing the drive torque of the engine. The high-power electronic system - for the first time flange-mounted directly onto the gearbox - allows a compact design which has never been possible before, as well as a sound arrangement of the hybrid components.

Battery: a high-performance, package-appropriate lithium-ion battery integrated in the luggage compartment supplies the vehicle electrical system. Its high storage capacity enables optimum exploitation of the potential provided by Brake Energy Regeneration.

Use of electrical power: due to the higher level of electrical power output available, additional vehicle functions can be powered purely electrically. The Auto Start/Stop Function for avoiding idling phases of the combustion engine is available virtually all the time and without any loss of comfort in conjunction with ActiveHybrid Technology.

The hybrid module is based on a technology which was conceived as part of the hybrid co-operation between BMW and Daimler. The hybrid co-operation successfully develops components for hybrid drives including high-power electronic systems and high-volt batteries. Here, the specific BMW design of the hybrid drive systems is ensured.

BMW Vision EfficientDynamics is based visually and technologically on the BMW X5. The BMW ActiveHybrid components are integrated in the vehicle in a way which is appropriate to the overall package. The generator and high-power electronic system are integrated in the transmission casing and thus invisible from the outside. A specially designed load compartment recess reflects the compact design of the lithium-ion battery.

Source: BMW press

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