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BMW Efficient Dynamics for 2008 - Various Efficiency Measures

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BMW Efficient Dynamics for 2008
Various Efficiency Measures
Efficient Dynamics in 3, 5 and 6 Series
Efficient Dynamics in X3, X5 and 1 Series
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High Precision Injection for 6 and 4-cylinder engines.
In addition to the in-line 6-cylinder engines, BMW’s 4-cylinder power units now also have petrol direction injection in its second generation. The technology is known as High Precision Injection and enables so-called lean combustion operation across a broad engine speed range, resulting in significant reductions in fuel consumption in everyday traffic. The highly precise and efficient fuel injection is carried out by piezo injectors which are positioned between the valves in the cylinder head and thus in immediate proximity to the spark plug.

In the model year 2008, 4-cylinder engines with High Precision Injection in lean combustion operation are used in the new BMW 520i, in all versions of the BMW 3 Series and the BMW 1 Series. In addition to the two engines already introduced with a capacity of 2.0 litres each, a new 1.6 litre petrol direct injection engine in the new BMW 116i now also sees its premiere. As compared to the predecessor engine in each case, the three new 4-cylinders have an output which is has been increased by between 5 and 15 kW. Nonetheless, fuel consumption in the models fitted with these engines drops by up to 23 per cent.

4-cylinder diesel with the latest common rail technology and now also with Variable Twin Turbo.
In the model year 2008 , the new generation of 4-cylinder diesel engines is also completed. The 2.0 litre lightweight construction aluminium units are now available in up to three output levels for the BMW 5 Series, the BMW 3 Series and the BMW 1 Series as well as the BMW X3. They are fitted with the latest version of common rail injection, in which piezo injectors convey the fuel into the combustion chambers – at a pressure of up to 2,000 bar for the first time. The most powerful version of the new 4-cylinder diesel engine is presented in the BMW 1 Series. It has a supercharging technology referred to as Variable Twin Turbo which was already used in the BMW in-line 6-cylinder diesel engines. This system consists of two turbochargers of different sizes. Due to is low moment of inertia, the smaller of the two turbochargers develops its performance-enhancing effect even at low engine speeds and without any noticeable delay. As the engine speed increases, the larger turbocharger comes into use. This combination ensures an impressive level of power delivery which is unsurpassed in its spontaneity.

The new 4-cylinder in the BMW 123d delivers 150 kW/204 bhp and is thus the world’s first all-aluminium diesel engine with a power output per litre of over 100 bhp. Due to its extremely precise fuel dosage and the high level of efficiency of its combustion process, it also achieves top figures in terms of economy – just like the other two new diesel engines. The BMW 123d makes do with 5.2 litres of diesel per 100 kilometres in the EU test cycle. Its CO2 level is 138 g per kilometre.

Even greater efficiency thanks to brake energy regeneration, Auto Start Stop Function and needs-oriented control of ancillary units.
In addition to the design of engines which are optimised for reduced fuel consumption and exhaust emissions, the development strategy BMW EfficientDynamics also includes a wide range of other measures which contribute to the increase of driving pleasure and economy in each new model. Among other things, the focus here is on weight optimisation, reduction of road resistance and the improvement of aerodynamics. Measurable progress towards favourable fuel consumption levels can also be made by means of intelligent energy management. In the model year 2008 there is a further increased number of vehicles in which these measures have been applied. The combination of measures to increase efficiency in the vehicle and within the engine environment is specifically adapted to each model and engine type. The measures are thus not limited to special models but are an integral part of every vehicle’s standard fittings.

In future, all models of the BMW 6 Series, BMW 5 Series, BMW 3 and BMW 1 Series as well as the BMW X5 will be fitted with brake energy regeneration. It is the result of intelligent energy flow management which leads to a more efficient use of the energy contained in the fuel and increased dynamic performance on acceleration manoeuvres. By means of brake energy regeneration, the generation of electrical current for the vehicle power supply is focused on the vehicle’s trailing throttle and braking phases. During the pulling phases, however, the generator is decoupled, providing more drive energy for conversion into driving dynamics.

Auto Start Stop Function was presented for the first time in spring 2007 in the new BMW 1 Series and in the BMW 320i Coupé/Convertible. In the model year 2008 enables a reduction of idling phases on interim stops at junctions or in traffic jams in all other 4-cylinder versions of the BMW 3 Series. As soon as the driver puts the gear lever into the neutral position and removes his foot from the clutch, the engine is automatically switched off. As soon as further travel is possible, it is sufficient to activate the clutch and the engine starts without delay. 

Other features for refining energy management in the vehicle include the needs-oriented control of ancillary units, the use of electrical steering and a Varioserv steering pump and the decoupling of the air conditioning compressor. For example, needs-oriented control of the coolant pump uses significantly less energy than conventional systems which run permanently at full capacity. The servomotor of the electric steering is only activated when steering boost is required or desired by the driver. With the Varioserv steering pump, the cam ring is adjusted in relation to pressure and volumetric flow so as to avoid the loss of drive train power as the engine speed increases. The power dissipation of conventional air conditioning compressors can also be reduced by means of intelligent regulation. In the new BMW models, the compressor is separated from the belt drive by means of a magnetic coupling as soon as the air conditioning system is out of operation.

These measures reduce the amount of electrical energy required, and as a result the generator has to convert significantly less primary energy into electrical current. A special low viscosity transmission oil contributes to the reduction of frictional loss. What is more, optimised heat management for the rear-axle drive ensures that frictional resistance is reduced more quickly after starting. The reduction of aerodynamic resistance also supports the decrease of fuel consumption. With cooling air flaps which open or close depending on the driving situation and which are actively controlled in some models, the aerodynamic properties of a vehicle can be further optimised.

The driver also receives support in the choice of the most economical driving style from the gear shift indicator. This system uses data provided by the engine control unit to calculate in each situation the most favourable point at which to shift down or up from the point of view of economical fuel consumption. The signal to change gear appears in the instrument panel. Here an arrow symbol and a figure show which gear would be most suitable for economical motoring.

BMW EfficientDynamics is a fixed element of every new BMW. The selection of measures is tailored specifically to each model, however. The following list shows which features are available in which models.

Brake Energy Regeneration: as standard in all models of the BMW 6 Series, BMW 5 Series, BMW 3 Series and BMW 1 Series as well as the BMW X5.

Auto Start Stop Function: as standard in all models with 4-cylinder engine (petrol and diesel) and manual transmission in the BMW 3 Series and BMW 1 Series.

Gear shift indicator: as standard in all models with manual transmission of the BMW 6 Series, BMW 5 Series, BMW 3 Series and BMW 1 Series.

Electrical steering: as standard in all models of the BMW 3 Series and BMW 1 Series except for the BMW 335i and the all wheel drive models.

Varioserv steering pump: as standard in the BMW 630i, 635d and all models of the BMW 5 Series and BMW X3.

Air conditioning decompressing with decoupling function: as standard in all models of the BMW 6 Series, BMW 5 Series, BMW X5, BMW 3 Series, BMW 1 Series except for the BMW 335i, 330d, 325d.

Electrical water pump: as standard in all models with 6 and 4-cylinder petrol engine of the BMW 6 Series, BMW 5 Series, BMW 3 Series and BMW 1 Series, in the BMW X3 (without X3 2.0i) and BMW X5.

Active aerodynamics: as standard in the BMW 635d, in all models of the BMW 5 Series, BMW 3 Series. BMW 1 Series and BMW X3 (without X3 2.0i, X3 3.0sd), BMW X5. Not available in 335i, 335d and all-wheel drive models of the 3 and 5 Series.

Tyres with reduced rolling resistance: Standard tyres in the BMW 525i, BMW 525d, BMW 520i, BMW 520d and in all models of the BMW 3 Series and BMW 1 Series, as well as BMW X3 (except X3 3.0sd) and BMW X5.

Last Updated on Thursday, 19 July 2007 06:54  

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