Tuesday, November 10, 2009

In depth : 2010 BMW X6 ActiveHybrid [ 170+ images ]

2010 BMW X6 ActiveHybrid

The BMW ActiveHybrid X6 is the world’s first Sports Activity Coupé with full hybrid drive offering a driving experience quite unique both in the segment of BMW X models and in the hybrid segment as a whole. Through its combination of a V8 gasoline engine and electric drive, the BMW ActiveHybrid X6 offers a significant increase in dynamic performance together with a reduction of fuel consumption and emissions by approximately 20 per cent. This joint enhancement of driving pleasure and efficiency clearly proves that the BMW ActiveHybrid X6 is a typical BMW in the hybrid segment.

BMW ActiveHybrid technology offers the driver three significant options: to drive under electric power alone, to use the power of the combustion engine, or to benefit form the combination of both drive modes. Driving completely free of CO2 in the electric mode is possible up to a speed of 60 km/h or 37 mph. The combustion engine then cuts in as required (as a function of load conditions) and is automatically switched off when driving in overrun at a speed of less than 65 km/h or 40 mph.

The drive system featured in the BMW ActiveHybrid X6 consists of a 300 kW/407 hp V8 power unit with BMW TwinPower Turbo Technology and two electric motors developing 67 kW/91 hp and, respectively, 63 kW/86 hp. Maximum system output is 357 kW/485 hp, peak torque is 780 Newton-metres/575 lb-ft. This makes the BMW ActiveHybrid X6 the most powerful hybrid vehicle in the world.

Through its unique balance of performance and fuel economy the BMW ActiveHybrid X6 sets new standards both in the hybrid vehicle segment and in the overall market of BMW X models. Acceleration from a standstill to 100 km/h comes in 5.6 seconds. Average fuel consumption in the EU5 test cycle is 9.9 litres/100 km (equivalent to 28.5 mpg imp), the CO2 emission rating is 231 grams/kilometre.

Integration of the two electric motors in the two-mode active transmission of the BMW ActiveHybrid X6 allows two self-sufficient modes of operation. One mode is for setting off in particularly dynamic style and for driving at low speeds, the second is for driving at a higher speeds under optimum conditions. This ensures all the benefits of BMW ActiveHybrid technology, with maximum efficiency under all loads and at all speeds. At the same time the seven-speed automatic transmission provided by the electric motors together with three planetary gearsets and four multiple-plate clutches ensures all the supreme driving behaviour, smoothness and performance so typical of BMW.

When applying the brakes or taking back the gas pedal kinetic energy is converted into electrical energy and stored in the high-performance battery. To provide this benefit either one or both electric motors act as a generator, depending on driving conditions. The recuperation efficiency and output achieved by the system is 25 times greater than with Brake Energy Regeneration featured so far in BMW’s production models.

Electrical energy is stored in an NiMH high-performance battery with a capacity of 2.4 kWh. The temperature of the high-voltage battery is controlled as required and with maximum efficiency by liquid cooling interacting with the air conditioning and an external heat exchanger.

The central electronic control unit ensures appropriate interaction of the combustion engine and electric drive crucial to the outstanding efficiency and unique qualities of the BMW ActiveHybrid X6. It converts high-voltage direct current from the high-performance battery into three-phase alternating current for the two electric motors in the hybrid transmission. It also coordinates all functions of the hybrid system including the distribution of torque and power between the combustion engine and the electric motors as well as the selection of gears.

Over and above the electric motors, the high-performance battery also supplies electrical energy to the power-consuming items linked to the 12-volt on-board network. The BMW ActiveHybrid X6 is equipped with electromechanical power steering and an electrical climate compressor both remaining fully functional also when the combustion engine is switched off and enhancing the overall efficiency of the vehicle to an even higher standard through their on-demand consumption and uptake of energy.

While braking the generator builds up stopping forces in the electric motors acting efficiently on all four wheels and precisely coordinated with the hydraulic brake effect in accordance with the driver’s stopping and deceleration requirements. This provides not only optimum stopping power, but also the brake feeling so typical of BMW under all driving conditions including the all-electric mode. A further point is that like the BMW X6, the BMW ActiveHybrid X6 comes with Dynamic Stability
control incorporating an enhanced range of functions such as Dry Braking and Fading Compensation as well as an electromechanical and hydraulic parking brake complete with an Auto-Hold function.

In its driving behaviour and motoring comfort, the BMW ActiveHybrid X6 offers all the standards provided by BMW’s latest X models, without the slightest difference between the electrical and the combustion drive mode. Intelligent xDrive all-wheel-drive technology with permanent, variable power distribution front-to-rear enhances the unique driving dynamics of the vehicle to an even higher standard.

The current operating mode and function of the drive system is clearly presented by appropriate displays in the instrument cluster and in the Control Display itself. The charge level of the high-performance battery at the disposal of the driver and the current operating mode are shown by appropriate gauges beneath the rev counter. Being informed of the power uptake when driving in the electric mode, the driver may if he wish maintain that mode longer in the interest of extra efficiency. And if
he wishes the driver may also call up information on the current flow of energy in the Control Display.

The particularly prominent Powerdome on the engine lid gives the BMW ActiveHybrid X6 a very distinctive look versus the “regular” BMW X6 as a significant visual highlight. “ActiveHybrid” model designations on the tailgate trim bar and on the front doors, the designation “BMW ActiveHybrid” on the door entry covers on either
side, 19-inch light-alloy wheels (or, as an option, 20-inch light-alloy wheels in aerodynamically optimised Streamline design), as well as exterior paintwork in exclusive Bluewater metallic for the first time on a BMW X6 serve furthermore to highlight the particular character of this unique car.

The BMW ActiveHybrid X6 combines innovative drive technology with the unique concept of a Sports Activity Coupé. The very progressive and exclusive character of this outstanding vehicle is further underlined by a particularly wide range of standard features as well as attractive options. The BMW ActiveHybrid X6 comes as standard with features such as comfort seats, automatic air conditioning, cruise control, the BMW Professional navigation system and Park Distance Control.

A further important feature is the electrical opening and closing function on the tailgate. Options include an extended range of nappa leather upholstery in an exclusive Ivory White/Black colour combination complete with double blue seams, a glass sliding/vent roof, a trailer towbar, as well as the complete range of BMW ConnectedDrive including innovative driver assistance systems.

The safety features offered by the BMW ActiveHybrid X6 include frontal and side airbags, head airbags at the side, crash-activated headrests at the front, runflat tyres as well as a Tyre Defect Indicator enabling the driver to monitor the pressure individually in each tyre. BMW Adaptive Headlights complete with a Bending Light function supplement the bi-xenon headlights with their daytime driving lights featured as standard.

Fascinating Efficiency : The BMW ActiveHybrid X6.

BMW ActiveHybrid technology combines superior driving dynamics with equally superior efficiency pointing far into the future, brining together both of these qualities to offer a truly unique driving experience.

The world’s first Sports Activity Coupé with full hybrid drive therefore capitalises on the options offered by combining the combustion engine and the electric motor with a standard of perfection never seen before.

BMW ActiveHybrid technology offers a significant increase in driving dynamics and at the same time reduces fuel consumption by approximately 20 per cent versus a comparable vehicle powered by a combustion engine alone. The result is even greater Sheer Driving Pleasure combined with enhanced fuel economy and CO2 management providing the kind of progress to make the BMW ActiveHybrid X6 a typical BMW in the hybrid market.

The overall drive system featured in the BMW ActiveHybrid X6 consists of a 300 kW/407 hpV8 gasoline engine with BMW TwinPower Turbo Technology and two electric synchronous motors delivering 67 kW/91 hp and, respectively, 63 kW/86 hp. Maximum system output is 357 kW/485 hp, peak torque is 780 Newton-metres/575 lb-ft.

Precisely controlled interaction of the three power units optimises the overall efficiency of the BMW ActiveHybrid X6 at all speeds, with acceleration from a standstill to 100 km/h in 5.6 seconds. Top speed of the BMW ActiveHybrid X6 is limited electronically to 236 km/h or 146 mph (250 km/h or 155 mph with the optional Sports Package, with average fuel consumption in the EU test cycle of 9.9 litres/100 km (equal to 28.5 mpg imp) and a CO2 emission rating of 231 grams per kilometre.

BMW’s first full hybrid model is able to run exclusively on electric power and that is entirely free of CO2 – up to a speed of 60 km/h or 37 mph, with the combustion engine being activated automatically whenever required.

Ideal variation of the two drive modes for enhanced efficiency and dynamism is ensured by The two-mode active transmission provides the
ideal combination of the two power modes for enhanced efficiency and dynamic performance at all times. With the two electric motors, three planetary gearsets and four multiple-plate clutches, drive power is transmitted through a seven-gear automatic transmission operated by the driver of the BMW ActiveHybrid X6 via an electronic gear selector lever and, respectively, shift paddles on the steering wheel.

BMW’s intelligent xDrive all-wheel-drive system spreads out engine power variably between the front and rear wheels.

The electric motors receive their energy from an NiMH high-performance battery positioned beneath the floor of the luggage compartment and feeding electric power also to the car’s on-board network. Luggage compartment capacity is therefore the same as on the “regular” BMW X6 with its combustion engine. When applying the brakes or taking back the gas pedal kinetic energy is converted into electrical energy and is stored in the high-performance battery. To provide this function either one or both of the electric motors acts as a generator, feeding electric power generated without the slightest increase in fuel consumption directly into the high-voltage battery. Subsequent use of this energy to provide extra drive power significantly reduces the consumption of fuel.

BMW ActiveHybrid technology raises the development of drive systems enhancing both efficiency and dynamism in one to a new, unprecedented standard, clearly confirming BMW’s superior competence in development in this area. Now the introduction of this innovative technology in such an exceptional vehicle concept adds a particularly fascinating motoring experience through the efficiency achieved in this way. Through its size, character and driving dynamics, the world’s one and only Sports Activity Coupé is particularly well-suited to combine the progressiveness and the potential of BMW ActiveHybrid technology to a standard never seen before.

Unique efficiency ensured by two-mode active transmission.

BMW ActiveHybrid technology has been developed specifically for use in a particularly dynamic vehicle and for a broad range of practical use. The big advantage, therefore, is optimization of drivetrain efficiency in all speed ranges and conditions.

The two-mode active transmission is based on an ECVT (electric continuously variable transmission) operating in two separate modes. One mode is for stop-and-go driving and low speeds, and the second is for driving at higher speeds.

From a stop and at low speeds, only one of the two electric motors is activated. As soon as the driver requires more power or increased speed, the second electric motor automatically starts the combustion engine. The second electric motor then serves as a generator to provide a supply of electric power to the vehicle systems. When driving steadily at a higher speed most of the power required is delivered by the combustion engine in a largely mechanical process. Here again, one of the two electric motors acts as a generator.

The mechanical components, including three planetary gearsets and the two electric motors, combine to provide for seven total effective gears. This configuration manages the power generated by the combustion engine and two electric motors in a way that maximizes driving versatility.

4.4 litre Twin-turbocharged V8 engine

Twin-turbocharged V8 gasoline engine with High Precision Direct Injection.

The combustion engine is the innovative reverse-flow V8 first featured in the BMW X6 xDrive50i. The world's first V8 gasoline engine with two turbochargers in the V-section between the two rows of cylinders develops power throughout the entire engine speed range. The spontaneous and direct response of this engine results from its compact configuration, which allows the shortest exhaust manifolds.

Displacing 4.4 liters, this outstanding engine delivers its maximum output of 400 hp between 5,500 and 6,400 rpm. Peak torque of 450 lb-ft is maintained from 1,750 to 4,500 rpm, with High Precision Direct Injection ensuring precise supply of fuel at all times. Piezo-injectors positioned in the combustion chambers between the valves ensure a smooth, efficient and clean combustion process. The engine fulfils the European EU5 standard as well as the ULEV II standards in the US.

Compared with the engine featured in the BMW X6 xDrive50i, this version has been modified in numerous respects to the specific requirements of the BMW X6 ActiveHybrid. There is no starter, alternator, or belt drive for the air-conditioning compressor and hydraulic pump. The dual-circuit cooling system has been modified for all-electric operation.

Electric motors for enhanced performance on no extra fuel.

When accelerating, the V8 engine of the BMW X6 ActiveHybrid joins forces with the electric motors to ensure optimum efficiency and dynamic performance. When the driver requires more power, the two electric motors supply additional torque for enhanced performance. This boost effect significantly increases the overall output of the vehicle, without increasing fuel consumption.

While the two electric motors have almost the same output, they have been modified in their performance characteristics to meet specific requirements. The power delivered is 91 hp and 86 hp, respectively, with peak torque values of 192 lb-ft and 206 lb-ft.

The electric motors support the combustion engine effectively throughout the entire speed range. The additional electrically-generated drive power reduces the power output required of the combustion engine when driving at steady highway speeds. Load shifts are managed to give the overall system enhanced efficiency under the full spectrum of driving conditions. During kick-down and maximum acceleration shifts, the electric motors help provide an additional boost of power.

Maximum system output is 480 hp, with peak torque of 575 lb-ft. This makes the BMW X6 ActiveHybrid the most powerful hybrid vehicle in the world, with acceleration from a standstill to 60 mph in just 5.4 seconds and top speed is limited electronically to 130 mph.

All-electrical driving mode reducing emissions to zero.

With its combination of two-mode active transmission and high-performance battery pack, the BMW X6 ActiveHybrid is able to run on its electric motors alone at low speeds. This makes it a zero-emission vehicle under such conditions.

The BMW X6 ActiveHybrid may run on electric power alone regardless of the ambient temperature, as long as minimum operating temperatures are reached for the engine coolant, transmission fluid and high-voltage battery. Top speed in the electric mode is 37 mph, maximum range is 1.6 miles.

While driving electrically, the BMW X6 ActiveHybrid retains all its safety and comfort functions. The brakes remain fully operative thanks to electric vacuum supply, and don't require the combustion engine to develop their full effect. The same applies to the Electronic Power Steering, with steering assistance being generated on demand by an electric motor.

Even the air conditioning remains fully available without any restrictions, running efficiently on an electrically operated air-conditioning compressor. Since the battery pack supplies the electric power to the 12-volt on-board network through a voltage converter, all other systems such as the lights, infotainment, and safety systems remain fully functional.

Energy Regeneration: Electric power generated without additional fuel consumption.

The BMW X6 ActiveHybrid features an enhanced version of Brake Energy Regeneration already used in some current BMW models running on a combustion engine alone. In this case the electric motors act as generators when coasting or applying the brakes in order to feed electric power into the battery pack.

This process recaptures energy which would otherwise be lost in conventional vehicles in the form of heat escaping through the brakes. Depending on road speed, one or both of the electric motors may perform the regeneration function.

The power delivered by the generator is approximately 50 kW, about 25 times as much as the power provided by BMW's original Brake Energy Regeneration.

Generator delivering electrical braking force.

In the generator mode, the two electric motors recapture much of the energy that must be dissipated to slow the vehicle. The stopping force generated in this way is up to 0.3 G, significantly reducing the demands on the mechanical brake system.

Sensotronic Brake Actuation (SBA) in the BMW Active Hybrid X6 may be used at any time without a direct mechanical connection between the brake pedal and the hydraulic circuit. Pedal movement is recorded by sensors and split by a control unit into brake power generated by regeneration and conventional hydraulic braking. At the same time an integrated pedal force simulator generates the usual brake feeling for the driver as an additional factor in this brake-by-wire solution.

The active brake servo builds up brake pressure with electrical control according to the signals emitted by the control unit. To ensure brake power assistance also in the all-electric mode, the BMW X6 ActiveHybrid employs an electrical vacuum pump. A mechanical failsafe function guarantees full operation of the brake system in the event of a failure or a fault in the electrical system. In this case, the stopping power required is generated by the hydraulic system alone, like on a conventional vehicle.

The primary task of the SBA system is to maximize the use of brake force available through the regeneration process. Via the xDrive powertrain, the hybrid system in the BMW X6 ActiveHybrid is able to transmit regenerative brake forces to all four wheels. And whenever the stopping power required exceeds the level of 3 meters/sec, the control unit builds up additional brake force through the mechanical brake by means of the active brake servo.

In braking situations critical to driving stability, the control unit receives additional signals from Dynamic Stability Control, affecting brakes and engine management to keep the vehicle safely on course. This ensures safe braking under all conditions, regardless of whether the stopping power needed is generated electrically or hydraulically.

All driving stability systems are tailored to the dynamic character of the BMW X6 ActiveHybrid. Dynamic Traction Control, for example, provides maximum traction and drive power on loose surfaces such as snow or sand thanks to its higher slip thresholds. And with the DTC mode activated, the driver may opt for a particularly sporting style of driving all the way to a controlled slip in corners.

BMW xDrive: intelligent all-wheel drive for extra performance, optimum driving stability and traction.

The sporty driving behavior of the BMW X6 ActiveHybrid is due largely to BMW's xDrive all-wheel-drive system. Electronically controlled, variable distribution of drive power front-to-rear gives the BMW X6 ActiveHybrid superior traction and enhanced driving dynamics.

xDrive features smooth division of drive power through a transfer case with an electronically controlled multiple-plate clutch that feeds power to the axle with optimum wheel contact and grip on the road. Under normal conditions BMW xDrive distributes drive power to the front and rear axle in a 40:60 split. Sensors constantly measure wheel slip at both the front and rear, and varies the balance of drive power within a fraction of a second. Unlike conventional all-wheel-drive systems, xDrive "looks ahead" and does not only respond when a wheel has already begun to spin.

Electronic Power Steering for even greater efficiency.

The BMW X6 ActiveHybrid is the first Sports Activity Vehicle to feature Electronic Power Steering. This allows variable steering assistance both when driving with the combustion engine and in the all-electric mode.

Electronic Power Steering on the BMW X6 ActiveHybrid comes complete with fully integrated speed-related Servotronic steering assistance. Servotronic reduces assistance at high speeds ensuring not only directional stability but also extremely precise steering behavior in corner. At low speeds, on the other hand, for example when parking, extra power assistance significantly reduces the steering forces required.

Liquid cooling for even greater performance on the high-performance battery pack.

The high-voltage, nickel-metal hydrid technology (NiMH) battery pack featured in the BMW X6 ActiveHybrid has a total capacity of 2.4 kWh, with 1.4 kWh available nominally. Maximum output is 57 kW, with the battery's control unit constantly determining the output level currently available as well as the charge status of the battery.

The high-performance battery pack comes with its own liquid cooling system incorporating a heat exchanger to cool the battery pack through the flow of air from the outside and, additionally, through a cooling circuit from the air conditioning system. These two circuits are activated either individually or in combination with one another, depending on need, with the control unit selecting the most effective and efficient cooling option as a function of ambient temperature and the temperature of the battery pack.

Cooling by the air conditioning system is activated by an appropriate switch valve, with the electrical climate compressor being switched on automatically whenever required. The battery cooling function is separate from the vehicle interior cooling function. Using the air conditioning system for battery pack cooling is far more efficient and effective than using air cooling alone to maintain the battery pack at the optimum operating temperature thereby preserving the hybrid functions longer in extreme weather and sport driving conditions. As befits The Ultimate Driving Machine, the BMW X6 ActiveHybrid provides a driving experience like no other hybrid in the marketplace.

Intelligent energy management and integral safety concept.

The electronics for BMW ActiveHybrid have been developed especially for energy efficiency and driving flexibility. The control system constantly controls the distribution of energy as a function of ambient conditions, the status of the vehicle, and the demands made by the driver. The two overriding control factors are the charge status of the battery pack and the capture of energy generated through regeneration.

The BMW X6 ActiveHybrid fulfills BMW's integral safety concepts that have been updated for hybrid vehicles. Examples of the features of this safety concept are the different colors of cables to avoid confusion, the presentation of clear safety warnings, and protection of the entire electrical system via extra-large insulation panels and newly developed connectors.

The high-voltage battery pack is housed in a reinforced steel casing and is located just above the rear axle at an extremely safe location in the event of a collision. The status of the battery pack is constantly supervised by integrated safety electronics, and the driver will be informed immediately of any malfunction and, if necessary, the entire system can be automatically discharged and deactivated. In the event of a crash, the system is switched off automatically within a fraction of a second. The central safety electronics then assess the severity of the accident and ensure a safe operating mode if possible.

Hybrid-specific Auto Start Stop function.

The BMW X6 ActiveHybrid is equipped with a new generation of Auto Start Stop technology, specifically tailored to the requirements of a hybrid vehicle. Auto Start Stop functions at all ambient temperatures. While the engine is switched off, the electric air-conditioning compressor automatically maintains the climate and temperature desired within the passenger compartment. All other electrically operated functions continue uninterrupted, with the on-board network supplied with power from the battery pack. The hybrid Auto Start Stop can be deactivated by choosing the Manual gearshift mode on the automatic transmission.

Displays inform the driver of the operating status and efficiency of the hybrid system.

Status of the hybrid system and current operating conditions are presented in two locations. The most important information is shown in the instrument cluster, separated according to operating mode. Further information and technical explanations are shown in the Central Display.

The drive displays are split into a conventional tachometer for the combustion engine and electric drive display in the lower part of the instrument cluster. The electric drive display shows the charge status of the battery pack, the regeneration status, and the electric motor operating status. In the Central Display, this information is supplemented by additional data on current operating conditions and the current flow of energy.

Specific set-up of the suspension and the lightweight brakes.

The chassis and suspension of the BMW Active Hybrid X6 is largely the same as the technology already featured on the BMW X6 xDrive50i. The front suspension is a double A-arm configuration ensuring excellent driving dynamics, comfort, and directional stability. Self-leveling with air suspension provides a constant ride height, even when carrying a heavy load.

Lightweight brakes decelerate the BMW X6 ActiveHybrid by means of aluminum floating calipers and brake rotors incorporating aluminum hubs (or hats). Lightweight materials engineering reduces unsprung mass and improves the vehicle's driving comfort and agility. Brake disc diameter is 15.2 inches up front and 13.6 inches at the rear.

20-inch light-alloy Aero wheels featuring an aerodynamically optimized design have been developed exclusively for the BMW X6 ActiveHybrid. 19-inch light-alloy wheels with all-season tires are available as an option. In each case the tires feature runflat technology which enables the driver to continue driving after a complete loss of pressure.

Bodyshell and safety: intelligent lightweight construction, optimized occupant safety.

Intelligent lightweight construction and a special body structure for maximum rigidity also characterize the unibody of the BMW X6 ActiveHybrid.

The BMW X6 ActiveHybrid comes with three-point inertia-reel seat belts for all seats featuring belt force limiters and belt pretensioners on the front seats. To protect the occupants from cervical spine injury in the event of a collision at the rear, the front seats feature crash-activated headrests, the rear seats come as standard with ISOFIX child seat fastenings. The vehicle is equipped with frontal and hip thorax airbags, and side-curtain head airbags.

All restraint systems are controlled by central safety electronics including rollover sensors. The system can activate the side-curtain airbags and belt pretensioners in the event of an impending rollover.

Standard adaptive bi-xenon headlights ensure optimum illumination of the road ahead by steering with the vehicle. A daytime running light function operates through the corona rings. The BMW X6 ActiveHybrid also features a windshield-mounted sensor that automatically controls the lights and windshield wipers on demand. Additional comfort at night is provided by available Automatic High Beams which will automatically dim the high beam headlights when an oncoming vehicle is detected. The standard Head-Up Display projects information relevant to the driver onto the windscreen.

The BMW X6 ActiveHybrid: Sports Activity Coupe of the highest standard, BMW ActiveHybrid with maximum efficiency.

The BMW X6 ActiveHybrid combines an innovative vehicle concept with cutting-edge drivetrain technology to provide a truly unique driving experience. The enhancement of both dynamic performance and efficiency gives BMW's Sports Activity Coupe additional appeal. BMW ActiveHybrid technology helps to achieve a high level of efficiency in this versatile model.

From outside the BMW X6 ActiveHybrid differs from the conventional-drivetrain models in only a few details. With its elegant and dynamically flowing roofline and features typical of a BMW, the Sports Activity Coupe offers a uniquely sporting rendition of this very special vehicle with its unprecedented character, now as a full hybrid variant.

The "powerdome" hood distinguishes the vehicle from outside, "ActiveHybrid" model designations on the tailgate trim bar and the front doors as well as Bluewater Metallic paint offered for the first time on a BMW X6. Apart from the specific hybrid displays in the instrument cluster, door entry trim covers bearing the designation "BMW ActiveHybrid" on the driver's and front passenger's doors add a particular highlight and sign of distinction.

Particularly the very impressive Powerdome on the engine compartment lid ensures a clear distinction of this very special vehicle from outside, “ActiveHybrid” model designations on the tailgate trim bar and the front doors as well as body paint in exclusive Bluewater metallic offered for the first time on a BMW X6 likewise alluding to the very special character of this very special vehicle.

Images : 2010 BMW X6 ActiveHybrid

[Source : BMW]


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