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7 Series - F01/F02 (2008 - ...) - EfficientDynamics

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BMW EfficientDynamics: exemplary fuel economy and emission control also in the luxury range.
Offering a large number of efficiency-enhancing technologies on and around the engine, all versions of the new BMW 7 Series come as standard with a particularly good balance of perfor-mance and economy. Brake Energy Regeneration, for example, ensures intelligent management of the flow of energy on all model variants, concentrating the generation of electric power for the car’s on-board network on overrun and application of the brakes.
This serves to charge the car’s battery without using any power from the engine and, accordingly, without drawing any energy from the fuel required. As long as the engine is pulling the car, on the other hand, the alternator generally remains disengaged in order to avoid any additional use of power actually required for the car’s performance.
Apart from particularly efficient generation of electric power, this also means more drive power and muscle for extra driving dynamics, for example when accelerating.
On-demand control of the cars’ ancillaries also serves to further optimise the all-round efficiency of the BMW 7 Series. The uptake of power by the fuel and steering assistance pumps, for example, may be reduced significantly as a function of driving conditions, saving energy in the process. The belt drive on the a/c compressor is fitted with a clutch for the same purpose, the compressor being automatically disengaged as soon as the driver or passengers switch off the air conditioning. Again, this reduces the drag force of the compressor to an absolute minimum.
Apart from tyres with minimum roll resistance, the BMW 730d also comes with optimised aerodynamic features in the interest of greater efficiency. The cooling air flaps on the BMW 740i and BMW 730d, for example, are controlled actively as required.
Since, when closed, the flaps reduce the car’s air resistance, they are opened only to meet a greater demand for cooling air.

750il_f02_side_driving

Featured as standard: high-precision, ultra-fast automatic transmission.
Power is transmitted on the new BMW 7 Series in standard configuration by a further upgraded six-speed automatic trans-mission with a particularly sporting gearshift.
A newly developed control unit offering an even higher standard of performance and control functions, as well as modified converter technology, ensure even more precise selection of gears, the automatic transmission shifting from one gear to the other with incomparable spontaneity and efficiency, benefiting not only the high standard of motoring comfort, but also and above all the superior driving dynamics offered by BMW’s luxury performance saloon. Thanks to direct access to the respective gear lane, shifting down more than one gear is just as fast as the standard shift from one gear to the next. So whenever the driver kicks down the gas pedal in the interest of supreme per-formance and dynamic acceleration, the automatic transmission will shift back immediately by up to four gears. Being directly connected to the engine with minimum converter slip and exact selection of gears, finally, the six-speed automatic transmission ensures particularly economical running conditions.
The automatic transmission is controlled by an electronic gear selector lever using electrical signals instead of mechanical control functions. The parking position is set by pressing the P button on the upper side of the gearshift lever. Then, to activate the manual gearshift mode, all the driver has to do is push the gearshift lever to the left, then shifting gears smoothly and conveniently by hand in sequential order. A display in the gearshift lever and a telltale light in the instrument cluster clearly present the gear currently in mesh.

Innovative suspension technology for a unique combination of comfort and dynamism.
The new BMW 7 Series offers a fascinating driving experience and at the same time meets not only the greatest demands in the world of modern motoring, but also a wide range of different requirements and preferences. The car offers supreme comfort together with maximum power and performance in the luxury class.
Just like the power units combining superior refinement with muscular output and dynamism, the suspension meets a wide range of virtually all demands and wishes, all-new suspension technology guaranteeing excellent body and roll comfort and at the same time giving the new BMW 7 Series a standard of agility quite unique in the luxury segment. In addition, the driver himself can chose in any time which of these features he wishes to enjoy in a specific situation, influencing the set-up of this car through BMW’s unique Dynamic Driving Control.
The new BMW 7 Series is the first BMW Saloon to feature a double-arm front axle. Very light thanks to its aluminium struc-ture, this special configuration with its comfort-enhancing separation of wheel guidance and damping ensures a standard of motoring comfort and smoothness never experienced before.
Almost completely unaffected by lateral forces, the dampers are able to respond to bumps on the road with supreme smooth-ness and ultimate control. The influence of adverse forces on the steering is also minimised, while the kinematic configuration of the double-arm axle ensures optimum adjustment of wheel camber to the road, optimising tyre grip on the surface in the interest of enhanced lateral acceleration.
The patented integral V rear axle specially developed for the new BMW 7 Series is likewise made of aluminium. Dynamic and drive forces acting on the wheel suspension are taken up by the wheel mounts, the rear axle subframe, the swinging arm and three track control arms.
The new elastokinematic swinging arm bearings provide inter-acting features and ride qualities enhancing both driving dynamics and motoring comfort. Effectively disengaging the road and the drivetrain, the axle also ensures a supreme standard of noise and vibration control. Rear axle air suspension featured as standard on the BMW 750Li and the BMW 740Li maintains the car’s ride height and ground clearance under all driving and load conditions. Any change in vehicle load is immediately taken into account and set off individually on each wheel, spring movements on account of bumps on the road and the inclined surface in bends almost completely avoiding the need any additional control action.
The new BMW 730d comes as standard with 17-inch light-alloy wheels. The BMW 750i and the BMW 740i, in turn, feature 18-inch light-alloy wheels. Runflat safety tyres measuring 245/55 R17 and, respectively 245/50 R18, again featured as standard, allow all models to continue for up to 250 kilometres or 155 miles, depending on the load they are carrying, after even a complete loss of air. And as a further point in this context, the Tyre Defect Indicator permanently monitors air pressure and warns the driver with a loss of pressure of more than 20 per cent.

Integral Active Steering controlling the steering angle both front and rear.
The double-arm front axle and the integral V rear axle are also able to interact with innovative suspension and steering systems.
Hence, the new BMW 7 Series may be equipped as an option with Integral Active Steering influencing steering forces as a function of road speed by means of Servotronic steering, con-trolling the steering angle by way of the additional Active Steering transmission on the front axle and, for the first time, changing the steering angle of the rear wheels by up to 3° through spindle drive and a concentrically arranged motor. At the front the Integral Active Steering varies the steering angle via an electric motor using data on wheel rotation speed, steering wheel movement, the yaw rate and lateral acceleration of the body provided by sensors for optimum control, thus ensuring optimum steering behaviour in all driving situations.
At low speeds the rear wheels are turned against the steering angle on the front wheels to significantly enhance the agility and nimble performance of the BMW 7 Series, making the car’s turning circle up to 70 centimetres smaller, depending on road speed. The significant improvement of agility provided in this way comes together with a further increase in motoring comfort thanks to the reduction of steering forces.
At higher speeds the Integral Active Steering ensures extremely comfortable and superior response on the road when changing lanes and in bends. The steering wheel angle on the rear wheels increases in this case in the same direction as the angle and movement of the front wheels, enabling the BMW 7 Series to follow the driver’s commands precisely and smoothly even in an abrupt steering manoeuvre.
The additional effect of Active Steering optimises steering response and reduces the movement of the steering wheel required. An additional advantage of rear-wheel steering comes to bear particularly on the rear seats, where any change in direc-tion under dynamic driving conditions, while building up lateral acceleration, will not result in a similar increase in the yaw rate.
And with these two factors being strictly separated and kept apart, the rear-seat passengers will enjoy an even higher stan-dard of driving comfort. This combination of Active Steering on the front axle and rear-wheel steering unique the world over benefits both the motoring comfort and driving agility offered by the car. In addition to the enhancement of stability in quick direction changes, Active Steering ensures even greater superiority and better handling in brake manoeuvres also in the new BMW 7 Series.
The combination of Active Steering with the DSC Dynamic Stability Control sensors, finally, prevents the car from swerving out of control when applying the brakes on different surfaces (modal split) by directly intervening in the steering.



Last Updated on Monday, 12 April 2010 14:36  
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