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BMW X5 Hybrid: Vision EfficientDynamics - Power basis: BMW diesel engines

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BMW X5 Hybrid: Vision EfficientDynamics
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Power basis: BMW diesel engines
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Powerful basis for efficient dynamics: BMW diesel engines.
It is with good reason that the diesel versions of the BMW X5 are especially popular not only in Germany but also in many other markets. Over the course of about two and half decades, BMW has gained experience in the construction of diesel vehicles and made use of its outstanding engine expertise in developing highly attractive representatives of this drive form. The model program ranges from the outstandingly economical BMW 118d with 4-cylinder diesel engine and 105kW/143bhp to the BMW 520d (4-cylinder, 130kW/177bhp) – with an unequalled level of efficiency in its class – through to the top class models, the BMW 635d Coupé and BMW 635d Convertible (in-line 6-cylinder diesel, 210kW/286bhp) and the luxury sedan BMW 745d (8-cylinder diesel, 242kW/330bhp).
All BMW diesel models are characterised by a balance between driving dynamics and economy which is unequalled by any other vehicle in the respective competitive field. In particular it is the combination of Variable Twin Turbo charging and common rail direct injection of the third generation which ensures such an excellent balance between engine output and fuel consumption. The unique charging system consists of two turbochargers of different sizes whose interaction is regulated by a powerful electronic control system. At lower engine speeds, the smaller turbocharger is initially active.
Due to its low moment of inertia it responds to slight movements of the accelerator pedal. As engine speed increase the larger turbocharger comes into play as well. In this way, the excellent pulling power of the engine sets in just above idling speed and is maintained across a broad load range. The efficiency of the engine is further optimised by the common rail system by which piezo injectors convey the fuel into the combustion chambers under very high pressure and in precisely measured quantities.

Engine of superlatives: BMW 4-cylinder diesel with Variable Twin Turbo.
Variable Twin Turbo Technology will be applied to a BMW 4-cylinder diesel engine for the first time in the model year 2008. The new 2.0 litre engine with Variable Twin Turbo – also an all-aluminium power unit with common rail direct injection of the third generation responsible for the fuel supply – delivers an output of 150kW/204bhp at an engine speed of 4,400rpm. The unique supercharging system makes the new 4-cylinder the world’s first all-aluminium diesel engine with a specific output of over 100bhp per litre of capacity. Its maximum torque of 400 Nm is equally impressive, already available at 2,000rpm. With its lively revving and the vehemence of its power delivery, the new 4-cylinder clearly leads the field when compared to other engines of its kind. Its pulling power reaches the level of higher-capacity 6-cylinder diesel engines.
The new 4-cylinder diesel engine not only sets standards in terms of output but also as regards efficiency. The impressive pulling power is combined with an unusually low weight thanks to the engine’s all-aluminium construction as well as a unique level of economy in relation to output. Its fuel consumption and exhaust emission levels significantly undercuts less powerful diesel engines among the competition. This outstanding efficiency is the second no less impressive characteristic of the engine. The key factor here is the common rail injection system of the third generation. In the 4-cylinder diesel with Variable Twin Turbo, the diesel fuel - fed via a shared line – is injected by piezo injectors into the combustion chambers under especially high pressure. For the first time, an injection pressure of 2,000 bar is reached. This enables a high degree of precision in the determining the quantity of fuel and efficient combustion. Since the fuel is injected in up to three portions per combustion cycle, the flame spreads relatively gently which mainly benefits the diesel engine’s running smoothness.
With this sum of qualities, the new 4-cylinder diesel with Variable Twin Turbo is ideally suited to becoming the central pillar in a concept with which to further develop the potential of BMW EfficientDynamics technology. Due to its efficiency it fulfils all the requirements for achieving uniquely low fuel consumption and exhaust emission levels. Thanks to its power and with the support of the generator, it fulfils the high demands made of an SAV model in the premium segment.
What is more, this modern engine perfectly complements the other innovations for the reduction of fuel consumption and exhaust emissions presented in the concept car BMW Vision EfficientDynamics. This especially applies to the study’s ActiveHybrid module. In developing the hybrid components, BMW is seeking to realise applications which are individually tailored to the specific model or concept in question. BMW ActiveHybrid is based on a modular principle which allows the optimum components for different vehicle concepts, according to the strategy “Best of Hybrid”. In the concept car BMW Vision EfficientDynamics, the 4-cylinder diesel engine and the generator complement each other ideally as Mild Hybrid components – just like the 8-cylinder petrol engine and the Full Hybrid concept in the BMW Concept X6 ActiveHybrid presented in 2007. This breadth of potential hybrid applications is in keeping with the principle of BMW EfficientDynamics of developing solutions for all vehicle segments and output categories which are specific to the concept and vehicle in question.
BMW develops hybrid components in co-operation with Daimler with each party having equal status. The aim of this co-operation is to develop and test components or hybrid drive forms for luxury performance segment vehicles. The integration of hybrid components in the various vehicles is undertaken by each manufacturer separately, taking into account the specific brand qualities of each.

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