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6 Series Coupe and Cabrio Facelift - E63/E64 ( 2007 - ... ) - Effecient: Brake Energy Regeneration

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Article Index
6 Series Coupe and Cabrio Facelift - E63/E64 ( 2007 - ... )
The early times for BMW Coupes
Design: Dynamics in Stylish Perfection
The 6 Series Convertible
Drivetrain: Superior Power, new Versatility
The 635d Straight-six Diesel
Effecient: Brake Energy Regeneration
Chassis, Suspension, Driver and Safety
Active Steering and Dynamic Drive
Active Cruise Control and Lane Departure Warning
Comfort and Safety
Features and Equipment
Navigation, Sound and BMW Individual
All Pages

Efficient: Brake Energy Regeneration and gearshift point indicator.
Featuring a wide range of efficiency improvements on and around the engine, not only the BMW 635d, but also the gasoline engine versions of the new BMW 6 Series provide a particularly good balance of performance and economy. Brake Energy Regeneration on all engine variants, for example, ensures intelligent management of the energy flow, concentrating the generation of electricity for the car’s on-board network on the overrun and brake phases. This means that the car’s battery is charged consistently without using engine power and, accordingly, the energy contained in the fuel. As long as the engine is pulling the car, on the other hand, the alternator generally remains disconnected. Apart from particularly efficient generation of electricity, this also provides more power for enhanced driving dynamics when accelerating.
To promote an economic style of motoring, the manual gearbox versions of the new BMW 6 Series come with a gearshift point indicator. As a function of driving conditions, the electronic engine control calculates the optimum point for shifting up in the interest of minimum fuel consumption, an arrow symbol in the instrument cluster showing the optimum gear and telling the driver the ideal point for shifting gears.


Mechanical disengagement of the car’s ancillaries to save energy.
Further technologies serving to save fuel develop their superior effect without any intervention by the driver. The belt driving the a/c compressor, for example, comes with its own clutch automatically disengaging the compressor as soon as the air conditioning is switched off, thus reducing the drag force exerted by the compressor to a minimum.
The electric coolant pump, in turn, adjusts the thermal management of the six-cylinder in the BMW 630i and, accordingly, its cooling efficiency to current requirements regardless of engine speed. While a conventional pump consumes up to 2 kW power in this process, the new, intelligent pump concept reduces the power uptake through on-demand control to just 200 watt. Again, the result is a significant reduction of fuel consumption, also because the engine reaches its normal operating temperature more quickly.
The Varioserv steering assistance pump featured in all models in the new BMW 6 Series reduces the loss in drive power normally suffered as a function of higher engine speeds through pressure- and volume-flow-related adjustment of the curve ring. A further point in this context is that the power steering in both models uses a hydraulic fluid with lower viscosity reducing friction within the steering system.
A special light-flow transmission fluid in the BMW 650i, to mention yet another improvement, also helps to reduce frictional losses. And optimised thermal management of the final drive in all models in the new BMW 6 Series likewise helps to reduce frictional resistance more quickly after starting the engine.
The reduction of air drag and resistance ensures yet a further reduction in fuel consumption on the BMW 6 Series: Cooling air flaps opening or closing as a function of driving conditions serve not only to reduce noise but also and above all to optimise streamlining both on the BMW 635d Coupé and the BMW 635d Convertible. 

New automatic sports transmission: even more dynamic, even more comfortable.
The new BMW 630i and the new BMW 650i both come as standard with a six-speed manual gearbox conveying the power of the engine to the drive wheels. An option on both models is the newly developed six-speed automatic sports transmission standard on both the Coupé and Convertible variants of the new BMW 635d. This cutting-edge transmission not only meets the greatest demands in terms of driving comfort, but also ensures dynamic conversion of engine power into driving pleasure.
On this new automatic sports transmission, the hydraulic system developed to an even higher standard, an innovative torque converter, and far more powerful software ensure not only an even more spontaneous response to the gas pedal, but also an extremely fast gearshift at all times.
Shifting down more than one gear is now just as quick as shifting down in the conventional process thanks to direct detection of the gear desired. So should the driver kick down the gas pedal, seeking to enjoy supreme performance, the automatic sports transmission will shift back immediately by up to four gears. In practice, this means that the car now takes less than one second to make the radical change from comfortable cruising to dynamic sports motoring. The clear impression for the driver is that the new six-speed automatic transmission is not only an improvement of performance, but also intuitive in its reaction, at the same time offering a very sporting driving experience at all times.
The dynamic characteristics offered by the new automatic transmission are attributable above all to the direct connection between the transmission itself and the engine. This, in turn, is made possible by new torque converter technology with an integrated torsional damper avoiding any unnecessary slip and, accordingly, loss of power. With the converter lock-up clutch being closed immediately after setting off, the driver gets the same feeling and impression as if he were at the wheel of a manual gearbox car. And last but not least, the new automatic sports transmission also serves to make the new BMW 6 Series even more economical.


Electronic gear selector lever and shift paddles on the steering wheel.
The driver controls the automatic sports transmission by means of an electronic gear selector lever with the layout of gears in the usual configuration. After use, the new gearshift lever returns to its starting position, the transmission itself being controlled by electrical signals, and not mechanically.
The new gear selector lever provides short and ergonomically pleasant gearshift travel, with the driver shifting to the parking position either by pressing the P button on the gear selector lever or automatically when switching on the engine.
To activate the manual selection of gears, all the driver has to do is briefly move over the gear selector lever from position D to the left, then shifting gears sequentially by hand either with the gear selector lever or with gearshift paddles on the steering wheel. A display in the lever and on the instrument cluster tells the driver at all times which gear is currently in mesh.
The driver’s other option is to shift gears in the manual mode by means of paddles on the steering wheel, thus switching over to a manual gearshift whenever he wishes, without even having to take one of his hands off the steering wheel. Instead, pressing either of the two paddles serves to shift down, pulling either of the paddles to shift up.
Pressing the Sports button behind the gear selector lever, the driver is able to enjoy an even faster and more dynamic gearshift, with the transmission following his commands even more spontaneously. A further change made in the process involves the control map for the Servotronic power steering featured as standard, again providing optimum conditions for dynamic acceleration.
Apart from the unusually fast gearshift, the driver receives clear feedback in this case every time the system shifts a gear. The spontaneous movement of the indicator needle in the rev counter to be observed in this case is yet further evidence of the car’s particularly fast and temperamental acceleration and performance.


Last Updated on Monday, 12 April 2010 14:39  

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