|The M double-clutch transmission with Drivelogic|
|01/17/2008 BMW Press - Britain (Euro Specs shown)|
Description in Brief
Shift Quicker, Drive Faster: The M double-clutch transmission with Drivelogic
BMW M GmbH is proud to be the world’s first car maker now offering a
The new M double-clutch transmission with Drivelogic shifts gears without
Given these qualities, the seven-speed Double Clutch Gearbox offers particularly the sporting and ambitious driver an attractive alternative to the six-speed manual gearbox featured as standard. Maintaining a permanent flow
A further essential point is that Drivelogic exclusive to BMW M with its five shift programs in the D- and six shift programs in the S-mode gives the driver the opportunity to tailor his BMW M3 individually to his personal style of motoring.
An even faster and more comfortable gearshift is ensured by the M double-clutch transmission with Drivelogic both in the automated (D-) mode and when driving in the manual (S-) mode.
The process of shifting gears is basically the same as on BMW’s proven Sequential M Gearbox, meaning that even when shifting gears manually there is no need for a clutch paddle and the driver may keep the gas pedal on the floor during the shift process as such.
To activate the D- or S-mode and to shift to reverse, the driver first has the choice of the new sports shift lever exclusive to the BMW M3, enabling the driver to shift gears himself in the S-mode. In this case he moves the gearshift lever only along one line, that is in a sequential process.
As an alternative the driver is able to shift gears via paddles on the steering wheel, pulling the right-hand paddle to shift up, the left paddle to shift down.
Consistent enhancement of the automated manual gearbox.
As early as in 1996, the BMW M3 became the first production car in the
In 2001 BMW M GmbH then presented the – again unique – Sequential
The new M double-clutch transmission with Drivelogic now offers further, consistent enhancement of the automated manual gearbox in BMW M GmbH’s high-performance sports cars. Similar to the Sequential M Gearbox featured so far, the new gearbox fulfils all the specific requirements coming from motorsport in the transmission of supreme engine power to the drive wheels and offers unique control and gearshift technology all enhanced to
Once again, therefore, BMW M GmbH is setting a new benchmark in technology through this new gearshift concept. And like the three generations of the Sequential M Gearbox in the past, the M double-clutch transmission with Drivelogic immediately comes at the top of the market in terms of sporti-ness and driving pleasure in a production car.
Motorsport as the benchmark, top performance as the principle.
In its concept and operating principle, the Double Clutch Gearbox comes straight from motorsport. On the race track, where every tenth of a second is crucial to winning or losing, this unique gearshift concept has proven its value and benefits in the same way as the sequential gearshift used in Formula 1: Shifting up with his foot fully on the throttle and without the slightest interruption of torque and pulling force makes even a professional driver a few fractions of a second faster, giving him that small but incredibly important advantage on the track.
Moving over to production cars, the problem so far was that the gearshift comfort required in everyday use could only be achieved in combination with far less powerful engines and with far less torque. But now, for the first time, the benefits of a Double Clutch Gearbox are available for the first time even under supreme loads. The M double-clutch transmission with Drivelogic is indeed the first power transmission of its kind the world over conceived
A further advantage for the driver of a BMW M3 is the systematic control concept ensuring maximum driving dynamics also in motorsport: Gearshift paddles on the steering wheel guarantee a very fast and, at the same time, safe gearshift in all situations, the sequential shift pattern serving to minimise the risk of making a mistake when shifting gears.
Always a step ahead when shifting gears.
The M double-clutch transmission with Drivelogic combines two gearbox components in one common housing with the same compact dimensions as
While driving, one of the two clutches is always closed, the other is open. When accelerating – and when shifting down – the clutches are activated
This interaction of two clutches ensures an unparalleled rate of gear change in particular because the transmission control unit pre-selects the next gear with the transmission ratio matched ideally to engine and road speed and keeps this gear waiting for immediate operation. So if the BMW 3 Series is accelerating, say, in third gear, an immediate flow of power is ensured by the appropriate clutch and the gearbox component controlling the uneven gears.
While all this is happening, the gearbox segment responsible for the even
This entire process takes only a few milliseconds, meaning that in the time even a skilled driver takes to press down the clutch pedal the M double-clutch transmission with Drivelogic has easily completed the entire process of shifting gears, continuing to accelerate in the next gear higher up.
Like in motorsport: dynamic torque peaks when shifting up, in-between gas when shifting down.
With the process of engaging and disengaging the gears continuing in a smooth flow, the positive engagement connecting the engine to the transmission is not interrupted, allowing the driver to set off smoothly and comfortably and, in particular, to shift up at an incomparably fast speed.
The combination of short gearshift times, small gear increments and the increase in torque gives the driver of a BMW M3 with an M double-clutch transmission a new, unprecedented experience of driving dynamics carried over directly from motorsport.
When shifting down the M double-clutch transmission works according to exactly the same principle. The only difference is that the electronic transmission control makes the process of engaging the clutch smoother and softer to prevent the rear wheels from being slowed down suddenly and
Should the electronic control unit – for example when the driver is driving
Electronic transmission management recognising the driver’s particular preferences.
In choosing the gear to be prepared for operation, the electronic control unit naturally takes current driving conditions – that is the current situation on the road – into account: Focusing on the position of the gas pedal, engine speed, road speed and the driving program currently in use, the system recognises the kind of acceleration the driver wishes to enjoy or, conversely, whether he wishes to reduce his speed on the road.
Operating in such an intelligent manner, the transmission control consistently makes the necessary preparations for harmoniously continuing a manoeuvre initiated by the driver. So even with an extreme change in the style of motoring, the system changes gears appropriately, again at unparalleled speed and
A two-mass flywheel serves as the torsion damper and the two clutches
Special cooling to handle even the most extreme conditions.
The engineers at BMW M GmbH have adapted the M double-clutch trans-mission with Drivelogic not only to the high engine speed concept and the specific torque curve of BMW’s M engines, but also to the high thermal loads encountered in the drivetrain of such a high-performance sports car. As an example, the transmission fluid is kept within the optimum temperature range not only by integrating the transmission into the coolant cycle of the engine. Instead, an additional oil/air cooler helps to avoid excessively high temperatures inside the M double-clutch transmission even under extreme conditions,
A further point is that the transmission fluid, being connected to the engine’s cooling system, reaches its normal operating temperature faster than
Perfect combination: eight cylinders and 8,400 rpm, two clutches and seven gears.
Both in its basic configuration and in the specific application on the BMW M3, BMW’s new M double-clutch transmission with Drivelogic is the ideal partner
In this process the engineers at BMW M GmbH were able – over and above their detailed knowledge of BMW M engines and their particular features –
Given this qualities, the M double-clutch transmission is particularly suitable
So precisely this kind of power and muscle was taken into account from the start in developing the M Double Clutch Gearbox.
Like the Sequential M Gearbox already featured today, the new M double-clutch transmission comes with seven gears allowing perfect adjustment of the transmission ratios to the engine’s power and performance. As a result,
This serves to capitalise on the engine’s torque and the traction and muscle offered by the high-speed concept throughout the entire speed range.
Shifting gears without interruption of power: dynamic and comfortable.
When it comes to driving dynamics, the seven-speed double-clutch transmission offers an advantage over seven-speed SMG already boasting an extremely fast gearshift by way of the change in gears now taking place without the slightest interruption of power and torque. In practice, this means even faster and more dynamic acceleration clearly measurable in seconds
The M double-clutch transmission is the only system of its kind able to offer the advantages of shifting gears without any interruption of power in combination with seven gears in a truly outstanding, high-performance car. The progress provided by this configuration comes to bear not only in the car’s driving dynamics, but also in its driving comfort and efficiency. The fast and smooth shift of gears, for example, ensures an unusually harmonious process
Precisely this is why the indicator needle in the rev counter is virtually the only sign of a change in gears when shifting in the automated mode. The load change reactions so typical of a conventional gearbox are avoided completely, ensuring a standard of driving comfort even under dynamic conditions never experienced before.
More gears, greater efficiency.
Compared with a conventional automatic transmission, the M double-clutch transmission allows greater fuel economy and cleaner emissions on exactly
With its overall gear spread of 4.8, the M double-clutch transmission with Drivelogic offers the appropriate transmission ratio in virtually every situation
Automatic or sequential – it’s the driver’s choice.
The M double-clutch transmission with Drivelogic allows both automated
To change from the automated to the manual gearshift mode, the driver is
The electronic control unit relieves the driver of the usual chore of shifting down in a predetermined process independently of the gearshift mode selected – for example when rolling towards traffic lights switching to red.
M-specific Drivelogic with eleven driving programs.
The driver of a BMW M3 equipped with the M double-clutch transmission
To provide this additional function, Drivelogic specially tailored to the M double-clutch transmission provides no less than five driving programs in the D- and six programs in the S-mode.
This gives the driver the opportunity to configure his BMW M3 perfectly to his personal preferences also when it comes to the car’s gearshift characteristics. At the same time he has the freedom to choose the appropriate set-up in various driving situations, taking, say, weather conditions, his route, or the load/number of passengers the car is carrying into account.
To change the gearshift program, all the driver has to do is press the Drivelogic button on the centre console. Indeed, he is even able to save his personal favourite among the Drivelogic options as part of an individual, personalised configuration, then retrieving this specific function at any time simply by pressing the MDrive button on the multifunction steering wheel of his BMW M3. Then, just like the gear currently in mesh, the driving program selected is shown in the instrument cluster between the speedometer and the rev counter.
Sports or comfort: the driver has the choice.
In the D-mode with the gearbox shifting automatically among no less than seven gears, the driver has the choice of five Drivelogic programs adjusting the gearshift characteristics very precisely to the driver’s individual style of motoring.
The driving programs differ through the speed at which they change gears
In a particularly sporting set-up – driving program D5 – the M double-clutch transmission shifts up almost like in a racing car whenever the driver activates
The other end of the gearshift range is Drivelogic stage D1 enabling the driver to set off in second gear. In this case the clutch is particularly smooth and
In the automated mode the driver is able to influence the gearshift for example by taking back the gas pedal slowly and determining himself when the transmission shifts up. Conversely, by kicking down the gas pedal he is able
Clear signals: feedback when shifting and Shift Lights.
In the manual gearshift mode the driver has the choice of six Drivelogic driving programs again rendering the complete range of features and characteristics so typical of the M Double Clutch Gearbox. In the most dynamic Drivelogic stages in the S-mode, management of the clutch is very sporting and dynamic, creating the direct flow of power so typical of a car with a manual gearbox – which is precisely what most drivers with a particularly sporting orientation expect. Indeed, this kind of feedback to the driver after shifting gears serves to further emotionalise the driving experience in a BMW M3 with the M Double Clutch Gearbox.
The engine speed required for optimum acceleration when shifting up is presented clearly to the driver by eight LED units housed in the upper edge of the rev counter on the ornamental surround. These Shift Lights enable the driver to precisely determine the ideal time for shifting gears. Six LED units flashing on in yellow one after the other accompany the engine as it approaches its top speed. The latest moment for shifting up is then presented by two LED units coming on in red.
Once the engine reaches its maximum speed, the lights so far remaining on consistently start to flash on and off. A further point is that the driver is able to configure the individual operation of the Shift Lights via the MDrive button and, if he wishes, deactivate their operation in the instrument cluster.
Manual mode with Launch Control for setting off like a racing car.
In the manual mode Drivelogic also provides a Launch Control function operating in accordance with specific BMW M parameters. Under optimum conditions in terms of the tyre condition, road surface and the load the
Then, after letting go the selector lever, the BMW M3 accelerates with optimum performance and with slip on the rear wheels controlled by the clutch – if the driver wishes, all the way to top speed.
In this process the M double-clutch transmission chooses exactly the right gearshift points ensuring optimum pick-up of engine speed when shifting up.
To use Launch Control the driver is first required to deactivate DSC Dynamic Stability Control. Then, after completing the acceleration process, the driver again takes command in choosing the gears he wishes to use.
Sequential gearshift like in a racing car.
The seven-stage M double-clutch transmission with Drivelogic is operated by an M-specific sports gearshift lever transmitting the driver’s shift commands electronically to the transmission management. This serves to facilitate the gearshift process, reducing control forces in accordance with the dynamic character of the gearbox and the car itself. The shift commands determined by the driver through manual control are generated in a sequential process,
To shift up to the next gear, all the driver has to do is briefly tip the gearshift lever backwards, to shift down all he does is briefly tip the lever forwards.
This configuration is the same as on the sequential gearboxes used in motor-sport and is the logical control mode for the sports-minded driver. At the same time this highlights the close connection between the M double-clutch transmission and motorsport technology.
Gearshift paddles on the steering wheel to shift gears quickly and smoothly.
In addition to the newly developed gearshift lever, the BMW M3 equipped with an M double-clutch transmission also comes with gearshift paddles on the steering wheel. Made of solid aluminium, these paddles enable the driver to shift gears manually ultra-fast and with maximum safety. In particular, this is because he does not have to take his hands off the steering wheel when shifting gears, which means extra safety in controlling the car.
Fitted firmly to the steering wheel, the gearshift paddles are always in a convenient position for shifting gears virtually level with the driver’s hands. They therefore enhance not only the driving experience, but also the
Like the sports gearshift lever, the gearshift paddles operate according to the usual pattern in motorsport: The paddle on the right is for shifting up, the paddle on the left for shifting down. And at the same time the high-quality finish of the aluminium paddles also establishes a direct link to motorsport with the flair of a genuine racing car.
The kick-down function is a special feature in controlling the car, operated either by the gearshift paddles or by the gearshift lever in the S-mode.
As soon as the driver presses the gas pedal right down to the floor (kick-down) and then pulls the left-hand paddle once or tips the gearshift lever forward, the transmission shifts back for optimum torque and pulling force.
Pulling the paddle or tipping the gearshift lever only once therefore makes the transmission shift down either one or several gears, whatever is appropriate. The electronic control unit in command of the M double-clutch transmission automatically changes the gear currently in mesh to give the car optimum acceleration under its current driving conditions and at the speed at which it
Comfort and safety functions rounding off the sporting character of the car.
The M double-clutch transmission with Drivelogic supports the driver of the BMW M3 not only when he prefers a particularly sporting mode, but also through a wide range of safety functions. In critical driving situations, for example, the M double-clutch transmission instantaneously opens the clutch currently active to prevent the rear end of the car from swerving round due to engine drag forces suddenly acting on the drive wheels.
For optimum conditions when driving at particularly low speeds – for example when manoeuvring below 5 km/h – the M double-clutch transmission features a Low Speed Assistant. This function already well known from the automatic transmission serves to significantly increase driving and control comfort, for example when parking, and is activated by briefly tipping the gas pedal. After the engine has been switched off, the electronic control unit also automatically activates a parking lock acting through the transmission.
Assistance when setting off on an uphill gradient.
Gradient detection by the M double-clutch transmission varies the gearshift points as a function of the route the driver is taking and its specific profile.
Motorsport character for everyday traffic:
Introducing the new M Double Clutch Gearbox, BMW M GmbH is presenting a power transmission which offers the latest state of the art in this technology. The M double-clutch transmission with Drivelogic excellently enhances
And at the same time the M double-clutch transmission with Drivelogic makes a helpful contribution to driving comfort and supports the driver in ensuring maximum efficiency at the wheel.
The M double-clutch transmission with Drivelogic offers all the features required to enjoy extra driving dynamics and motoring comfort as well as a new standard of all-round economy in a car of this calibre. Compared with a conventional automatic transmission, for example, there is no loss of energy otherwise caused by the torque converter.
A further advantage of this high-performance transmission management is that it is able to provide the ideal transmission ratio at all times for maximum efficiency, taking the particular style of motoring preferred by the driver into account. In this way the M double-clutch transmission with Drivelogic also helps to reduce fuel consumption and emissions.
Proudly presenting the new technology, BMW M GmbH is once again highlighting the Company’s competence in modern technology and its leading role in the development of high-performance cars able to provide their racing qualities also in everyday motoring and offer up-to-date comfort and efficiency at the same time.
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