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X6 ActiveHybrid - E72 (2009 - ...) - Driving Experience: Greater Efficiency and Greater Dynamics Everywhere You Go.

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X6 ActiveHybrid - E72 (2009 - ...)
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Driving Experience: Greater Efficiency and Greater Dynamics Everywhere You Go.

• Typical BMW driving experience also in the all-electric mode.
• Acceleration from a standstill to 100 km/h in 5.6 seconds.
• Recuperative application of the brakes and electronic steering assistance for greater efficiency combined with the superior handling so characteristic of BMW.
“The BMW ActiveHybrid X6 combines superior dynamics with outstanding efficiency. This makes it the BMW in the hybrid market offering that unique driving experience so typical of the BMW brand in every situation.” Peter Tünnermann, Project Manager BMW ActiveHybrid X6

The world’s first Sports Activity Coupé with full hybrid drive capitalises on the dynamic potential of hybrid technology in a truly unprecedented manner, providing a driving experience quite unique both in the segment of BMW X Models and in the hybrid market as a whole.
The drive system revolving around the unique Two-Mode Active Transmission ensures precise interaction of a high-performance V8 power unit with two electric motors, providing a standard of variability never seen before in a hybrid vehicle: The BMW ActiveHybrid X6 is able to cover short distances exclusively on electric power without the slightest CO2 emissions, the impressively spontaneous and direct response of the vehicle opening up a new standard of driving dynamics so typical of BMW. At the same time the driver of the BMW ActiveHybrid X6 is also able to use the superior potential of 357 kW/485 hp overall system output for fascinating acceleration up to the electronically limited top speed of 236 km/h (146 mph) or, respectively, in combination with the optional Sports Package, 250 km/h (155 mph).
The drivetrain and suspension technology featured in the BMW ActiveHybrid X6 guarantees maximum safety, precision and driving pleasure under all conditions and in all kinds of terrain. Intelligent BMW xDrive all-wheel-drive technology, DSC Dynamic Stability Control, as well as the suspension incorporating a double-wishbone front axle and an integral-IV rear axle set the foundation for truly outstanding driving dynamics.
With this performance-oriented character, the Sports Activity Coupé conveys the driving pleasure so typical of a BMW X Model into the segment of hybrid vehicles, thus standing out clearly from comparable concepts.

A typical BMW also in the all-electric mode.
The drive system featured in the BMW ActiveHybrid X6 offers no less than three different operating modes: all-electric motoring in the full hybrid mode, exclusive use of the eight-cylinder combustion engine, and an infinitely variable combination of both of these variants. The transition from one to the other operating mode is masterminded almost unnoticeably for the driver by the central power electronics as a function of current load and performance requirements. In the process the Two-Mode Active Transmission feeds drive power to the wheels in the same way as a seven-speed automatic transmission with an extremely fast and precise gearshift.
The Two-Mode Active Transmission and the high-performance battery enable the BMW ActiveHybrid X6 as the first production BMW to drive exclusively on the power of its two electric motors. Maximum speed in the all-electric mode is 60 km/h, with a maximum operating range of 2.5 kilometres or 1.6 miles. While running on electric power, all safety and comfort functions remain fully operative, with the various power-consuming items being fed with electrical energy by the high-performance battery operating through the on-board network.

x6_e72_activehybrid_house

Overall system output of 357 kW/485 hp for superior dynamics under maximum load.
Setting off from a standstill under normal conditions, the BMW ActiveHybrid X6 starts out under electric power alone. As soon as the first electric motor has reached its power limit, the second electric motor automatically activates the eight-cylinder combustion engine and subsequently acts as a generator supplying electric power to the first electric motor. The transition from all-electric to conventional operation and drive power is absolutely smooth and seamless.
Whenever the vehicle is running under particularly high loads the driver, pressing down the gas pedal all the way, is able to build up appropriate feedback from the V8 power unit for maximum acceleration he will genuinely experience and feel in the vehicle. A mechanical path activated at the same time by the Two-Mode Active Transmission serves furthermore to increase engine torque when setting off for particularly powerful traction and pulling force.
At a steady speed the main supply of power comes from the combustion engine, with one electric motor offering additional boost to provide the drive power desired by the driver on reduced output from the V8 power unit, while the other electric motor serves as a generator to deliver electrical energy. This combination of the two power sources significantly enhances the efficiency of the vehicle also at high speeds, the Two-Mode Active Transmission providing the optimum transmission ratio under all conditions for supreme performance and efficiency in one. The result is that unique supremacy so typical of a BMW, based on the running smoothness and elasticity of a large-capacity V8 power unit.
The drive system in the BMW ActiveHybrid X6 provides its full potential when accelerating all-out from medium or high speeds. With its maximum output of 300 kW/407 hp, the eight-cylinder gasoline engine featuring BMW TwinTurbo Technology serves initially as the only source of drive power for optimum efficiency and superior traction. Then, as soon as the driver requires even more power and performance, the two electric motors cut in for additional output, increasing overall system power to 357 kW/485 hp, with peak torque of 780 Newton-metres/575 lb-ft.
Using this boost effect, the BMW ActiveHybrid X6 offers a dynamic potential for dynamic acceleration and superior overtaking manoeuvres. Flexibility when accelerating from 80 – 120 km/h is up by approximately 5 per cent over the corresponding model with a conventional drive system. And at the same time this enhanced power and performance does not come at the expense of greater fuel consumption, since the boost effect is delivered exclusively by the electric motors fed with energy from the high-performance battery generated without any additional consumption of fuel.
Acceleration from a standstill to 100 km/h comes in 5.6 seconds. This means that the BMW ActiveHybrid X6, despite its inevitably higher weight, offers the same kind of dynamic potential as the BMW X6 xDrive50i running exclusively on an eight-cylinder power unit. Top speed is limited electronically to 236 km/h or 146 mph. And equipped with the optional Sports Package, the BMW ActiveHybrid X6 offers even higher top speed of 250 km/h or 155 mph.

Boost effect for supreme spontaneity in shifting gears and dynamic acceleration without the slightest interruption of power.
The electronic control unit featured on the hybrid drive system ensures an ongoing, continuous surge of power at all times, response boost, as it is called, increasing maximum power to an even higher level when shifting gears. This the driver will feel when accelerating without any noticeable interruption of power and traction during gearshifts.
In a kick-down manoeuvre for maximum acceleration, the electronic control unit generates stationary boost from the beginning when shifting back, then providing this extra power immediately after the driver has chosen a lower gear.
Both of these features give the BMW ActiveHybrid X6 unprecedented spontaneity in responding to every movement of the gas pedal.

Brake system combining recuperative and hydraulic stopping power while retaining the same feeling for the pedal as before.
Matched to the ability of the BMW ActiveHybrid X6 to drive in the full hybrid mode exclusively on the power of the electric motors with the combustion engine switched off, a number of vehicle functions have been modified for all-electric operation. The specific configurations chosen for this purpose nevertheless ensure a harmonious driving experience not deviating in any way from the usual feedback provided by a conventional vehicle running exclusively on combustion power.
A pedal force simulator integrated in the Sensotronic Brake Actuator (SBA), for example, simulates the brake feeling to which the driver is accustomed, even though under normal operating conditions signals are transmitted according to the brake-by-wire principle without a mechanical connection between the pedal and the brake circuit. When applying the brakes the central electronic control unit first activates the recuperation mode using the electric motors as generators, the brake power developed in this way being transmitted by the xDrive powertrain in the BMW ActiveHybrid X6 to all four wheels as a function of current traction conditions.
The electrical brake system is able to generate stopping power of up to 3 m/sec2or, respectively, 0.3 g through recuperative energy alone, thus taking a significant load off the mechanical brake system. Only when the driver calls up additional stopping power by kicking down the brake pedal does the mechanical brake system in the BMW ActiveHybrid X6 cut in accordingly.
The split of overall brake power into regenerative and hydraulic power remains quite unnoticeable to the driver and the feedback he receives in terms of pedal forces, brake dosage and fading maintains the usual feeling already offered by the brake system in all BMW cars.
The lightweight brake system featured in the BMW ActiveHybrid X6 incorporates swing-calliper disc brakes with brake shoes and pistons made of aluminium. Brake disc diameter is 385 millimetres/15.2” up front and 345 millimetres/13.6” at the rear. The brakes themselves operate very smoothly and ensure an extremely high level of resistance to fading, consistent lightweight construction serving to reduce unsprung masses and improve both driving comfort and agility.
To maintain appropriate brake power assistance also in the all-electric mode, the BMW ActiveHybrid X6 comes with an electrical vacuum pump. Should the electrical system suffer a defect or failure of any kind, a mechanical fallback option will maintain the unrestricted function of the brakes – and should driving stability become critical while applying the brakes, the control unit will use additional signals from DSC Dynamic Stability Control to stabilise the vehicle.
Appropriate intervention in the brakes and engine management ensures safe and reliable braking qualities under all conditions, all the electronic driving stability systems in the BMW ActiveHybrid X6 operating smoothly and independently of whether brake power comes from electrical recuperation or mechanical application of the conventional brake system.

Electronic power steering with Servotronic control: optimum steering assistance also in the all-electric mode.
To provide active steering assistance both in the combustion mode and when driving under electric power, the BMW ActiveHybrid X6 is the first BMW X Model equipped with EPS Electronic Power Steering.
This ensures optimum steering assistance in all situations and under all conditions, for the driving experience and feeling so typical of the brand.
At the same time EPS reduces impacts conveyed from the road (bumps) to the sports steering wheel, without losing the desired feedback on road conditions required by the driver. A further advantage is that Electronic Power Steering is able to return the steering wheel after a bend actively to the straight-ahead position, reducing the steering effort required particularly at low speeds.
Servotronic speed-related steering assistance is a major feature of Electronic Power Steering in the BMW ActiveHybrid X6. Intentionally reducing power assistance at high speeds, Servotronic not only ensures good directional stability, but also provides greater precision in steering into bends and gives the driver that precise feeling at high speeds so typical of a BMW. At lower speeds, for example when parking, greater steering assistance serves in turn to reduce steering forces significantly.

Electronic gear selector lever and shift paddles on the steering wheel featured as standard.
The Two-Mode Active Transmission enables the driver of the BMW ActiveHybrid X6 to shift gears manually whenever he wishes either through the electronic gear selector lever or through shift paddles on the steering wheel. The paddles operate in roughly the same way as similar systems in motorsport, further accentuating the dynamic driving experience offered by the BMW ActiveHybrid X6. By pressing one of the two paddles, the driver tells the transmission to shift down, by pulling the other paddle he will make the transmission shift up, in each case by one gear.
Multifunction switches integrated in the spokes of the steering wheel allow quick and convenient operation of the audio and telephone system, without distracting the driver from traffic conditions.

Hybrid-specific Auto Start Stop for ongoing operation of the automatic air conditioning even with the combustion engine switched off.
The BMW ActiveHybrid X6 for the first time features a new generation of the Auto Start Stop function adapted to the specific requirements of a hybrid and at the same time operating with a significantly greater level of comfort. The combustion engine is switched off automatically when stopping at a road junction or traffic lights, again without any impairment of the driver’s feeling for the vehicle, just as the V8 power unit starts without the slightest delay as soon as the driver calls up more power when accelerating.
During the short periods in which the combustion engine is switched off, and of course while driving under all-electric power, all the electrically operated functions of the vehicle remain fully operative, the on-board network receiving an ongoing supply of power from the high-performance battery.
The electrical a/c compressor, for example, maintains full climate control of the passenger compartment and other electrical power-consuming items such as the lights and entertainment systems likewise remain fully available even with the combustion engine switched off.

Graphic presentation of hybrid drive functions.
Two displays in the cockpit of the BMW ActiveHybrid X6 provide information on the current operating status of the hybrid system. The most important information is presented in the central instrument cluster, clearly separated according to the different drive modes. Further information and technical explanations, in turn, are provided in the Control Display on the centre console.
The display in the central instrument is split up into a conventional rev counter for the combustion engine and special indicators for the electrical drive system at the bottom of the instrument. These displays are connected visually by information on the standby status of the vehicle, the indicators covering the electrical drive system relevant to the driver comprising information on the charge status of the high-voltage battery, the recuperation display, the boost effect supporting the electric motors while accelerating, as well as the gears in mesh in the all-electric mode.

x6_e72_activehybrid_display_charge x6_e72_activehybrid_display_drive x6_e72_activehybrid_display_drive_2 x6_e72_activehybrid_display_drive_3 x6_e72_activehybrid_display_eboost

Sophisticated suspension technology, effective driving stability systems.
The chassis and suspension of the BMW ActiveHybrid X6 come largely with the same technical features as on the BMW X6 xDrive50i. The front axle is a double-wishbone configuration ensuring excellent driving dynamics, superior driving comfort and very good directional stability. The integral-IV rear axle, in turn, has been adjusted to the specific requirements of the hybrid model in terms of weight distribution and drive power, the rear axle therefore guaranteeing a supreme driving experience also benefiting from self-levelling by means of air suspension for high loads featured as standard.
All functions of DSC Dynamic Stability Control are carefully matched to the particularly dynamic character of the Sports Activity Coupé also on the BMW ActiveHybrid X6. Available at the touch of a button, DTC Dynamic Traction Control increases the slip thresholds for maximum driving power on loose surfaces such as snow or sand. And with the DTC mode in use, the driver is able to enjoy a particularly sporting style of motoring all the way to controlled drifts in a bend.
DSC in the BMW ActiveHybrid X6 comprises a wide range of other functions for safe and dynamic motoring. These include features such as ABS anti-lock brakes, ASC Automatic Stability Control, TSC Trailer Stability Control, HDC Hill Descent Control, DBC Dynamic Brake Control automatically maximising brake pressure for particularly high brake power, as well as CBC Cornering Brake Control and the ABD-X Automatic Differential Brake function automatically applying the brakes on a wheel about to spin and thus taking on the function of a differential lock.
Under extremely high brake temperatures an appropriate increase in brake pressure prevents the usual fading effect with its loss of brake power.
Regular Dry Braking the driver will not even feel optimises the performance of the brake system in the wet – and as a further advantage the brake system automatically builds up moderate hydraulic pressure whenever the driver takes his foot off the gas pedal very quickly, thus ensuring an optimum brake effect even faster in an emergency.
The BMW ActiveHybrid X6 comes with a parking brake using electromechanical or hydraulic power as required and operating without restrictions both in the full hybrid mode and with the combustion engine.
The driver activates or releases the parking brake by means of a button, with the parking brake featuring an on-demand Automatic Hold function automatically keeping the vehicle in position at a standstill without requiring the driver to operate the brake pedal again.
As yet a further helpful feature, the Start-Off Assistant makes it easier for the driver to set off on a gradient by holding the vehicle in position for about 1 ½ seconds after the driver has taken his foot off the brake.

Intelligent xDrive all-wheel-drive technology: variable power distribution for maximum supremacy and the dynamic performance typical of BMW.
Intelligent xDrive all-wheel-drive technology provides the foundation for the sporty driving behaviour of the BMW ActiveHybrid X6. Permanent all-wheel drive with electronically controlled, variable distribution of drive power between the front and rear axle gives this new vehicle and, indeed, all BMW X Models not only supreme traction, but also enhanced driving dynamics. BMW xDrive is able to vary the distribution of power within fractions of a second as soon as its sensors register any tendency to spin on the front or rear wheels.
Offering these qualities, xDrive supports the driving dynamics of the BMW ActiveHybrid X6 by effectively counteracting even the slightest inclination to over- or understeer right from the start. Should the vehicle show an inclination to oversteer, for example, BMW xDrive will reduce the transmission of power to the rear wheels pushing to the outside in a fast and finely dosed process the driver will not even notice. And at the same time he can still drive the BMW ActiveHybrid X6 with superior precision and in very sporting style.
Conversely, BMW xDrive prevents any tendency to oversteer, reducing the transmission of power to the front wheels pushing to the outside for greater lateral support and stability.
The bottom line is that the BMW ActiveHybrid X6 keeps the driver in control at all times, even under the most demanding conditions. So that intervention by DSC Dynamic Stability Control connected to xDrive through Integrated Chassis Management is required only in exceptional cases.



Last Updated on Saturday, 01 May 2010 17:42  

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