BMW expands its range of 6 -series models by adding a coupe variant and another from the cabrio. In the spring of 2012 the models BMW 640d xDrive Coupé and BMW 640d xDrive Cabrio will be launched on the market. In this way, the intelligent total traction system in BMW series with a diesel engine with BMW Twinpower Turbo technology is combined for the first time.
The new BMW 640D XDRive Coupé is able to accelerate in just 5.2 seconds from 0 to 100 km/h. The 230 kW/313 hp diesel propeller offers an excellent degree of efficiency thanks to BMW Twinpower Turbo technology. In combination with the automatic eight -speed sports gearbox included as standard, consumption and emission values are specimens. The XDRive system distributes the motor torque in a precise and variable way between the wheels of the two axles. The electronic system control system, included in the DSC Stability Dynamic Control System network (Dynamic Stability Control), guarantees excellent traction capacity, maximum safety, excellent maneuverability and optimal delivery of power under any meteorological condition and on any type of road. The average consumption of BMW 640d xDrive Coupé is 5.7 up to 5.8 liters to 100 kilometers (the values measured according to EU test cycle depend on the size of the tires). The corresponding CO2 values cover from 149 to 153 grams per kilometer.
6 -cylinder in line diesel engine with BMW Twinpower Turbo technology
The diesel engine used in the BMW 6 series models offers an immediate response and a powerful acceleration and recovery capacity silently.
The previous range of BMW 6 series models had already included models with diesel engine for the first time. The latest generation of the most powerful diesel engine has a displacement of 3,000 cc, an optimized weight aluminum crankcase and has the latest BMW Twinpower Turbo technology. The technology applied in this model includes a turbocharged system in several phases and direct injection by common duct with piezoelectric injectors that apply a maximum pressure of 2,000 bar. Turbo two -phase overload results in a spontaneous and vehement power delivery at the same time. The injection system guarantees precisely dosing fuel, allowing an efficient and clean combustion process.
Two phases of optimized efficiency
The new execution of the Turbo Two -phases system reacts more precisely than ever to the demands that the dynamic situation of the car raises at all times. A small turbo unit is first activated at low revolutions, which reacts especially quickly due to its minimum moment of inertia. Compressed air from this unit is directly feed on combustion chambers through a bypass type duct. As the air does not pass through the larger load unit, there are no losses when the pressure is generated. If the driver accelerates demanding a larger load, the electronic control system of the Bypass activates the larger turbo unit. The response capacity of the Turbo System, in addition to being defined by the solicitation at all times, manages to optimize by the variable geometry of the Turbo Small unit turbine.
In this way, especially spontaneous reactions are obtained from any accelerator movement. The maximum 630 Nm motor torque is available at a very low engine regime, between 1,500 and 2,500 revolutions. The propeller delivers its maximum power to 4,400 rpm. Under these conditions, the car has a very dynamic behavior, being able to accelerate vehemently from any speed. Since the eight -speed sports automatic gearbox has been thoroughly adapted to the characteristics of the operation of the engine, the large pair available along a wide margin of request is optimally used, which allows opting for a sports and safe driving style at the same time. If the ECO PRO mode is activated, also included as standard, the power reserves of the propellant sportsman are efficiently exploited to favor relaxed and lower consumption driving at low revolutions.
BMW EFFECIENTDYNAMICS TECHNOLOGICAL SET AND PERSONALIZED SERIAL ADJUSTOR SELECTOR
The ECO PRO mode that is activated with the personalized adjustment selector included as standard, affects the engine control system, in the characteristic of the accelerator and the behavior of the automatic gearbox. Additionally, the power consumption of the electrical equipment of the car is specifically controlled, such as the air conditioner, the heating of the exterior rearview mirrors and mirrors, so it improves the efficiency of energy management. Several special indicators report, among others, about the greatest autonomy achieved in this way, expressed in kilometers. BMW EFFECIENTDYNAMICS technology included in the BMW 640D XDRive Coupé includes, among others, the braking energy recovery system, the Auto Start/Stop function, the activation of secondary groups as necessary and automatic control of air inlet covers.
With the custom adjustment selector it is possible to activate the "Sport", "Sport+" and "Comfort" modes and, in combination with the Optional DDC teams (dynamic suspension control) or, respectively, Adaptive Drive, the "Comfort+" mode can also be activated. The personalized adjustment selector affects the progression of the accelerator pedal, the engine response capacity, the characteristic line of the service, the reaction thresholds of the DSC stability control system, the dynamism of the change of gears of the automatic box and, in addition, also in the characteristic line of the damping and the suppression system of the lateral inclinations. When selecting any of the modes, the driver activates a complete and congruently memorized adjustment, including the sound of the engine that can be perceived in the cabin. The engine sound is amplified to transmit it to the cabin through a sound module, considering the dynamic conditions of the car and the chosen mode with the personalized adjustment selector. The digital processing system of the signals directs directly to the signals issued by the engine control unit, considering the revolutions, the torque and the speed of the car. In this way, the driver obtains very precise information from the degree of engine request.
Total tensile system
In the BMW 640D XDRive Coupé, the latest version of the intelligent total traction system is included, which in addition to variablely distributing the force between the wheels of the two axes, also covers the Performance Control function to distribute the moment of promotion between the two wheels of the posterior axis as required by the situation.
Unlike conventional total traction systems, the BMW XDRive system electronically not only manages to optimize traction capacity on slippery roads, since it additionally increases the dynamic properties of the car by drawing curves. Including the total traction system, the DSC stability control system (Dynamic Stability Control) and the ICM chassis management system (Integrated Chassis Management) in the same network, it is possible to detect and analyze any dynamic situation, in order to activate in time the corresponding regulation systems. The system can be limited to total XDRive traction management, but may also include the activation of the DSC stability regulation and performance control system. The distribution of the force varies rapidly and with great precision, so that the car maintains the maneuverability that distinguishes all the BMW brand vehicles although the driver is drawing curves at high speed.
The total traction system used in the BMW 6 series models has a specific adjustment, considering its dynamic properties and characteristics. The system respects a fundamental principle of the brand, maintaining the advantages offered by rear traction, typical of BMW models, and taking advantage of the advantages of force distribution among the four wheels, achieving a harmonious result. During normal operating circumstances, any BMW brand model provided with the intelligent total traction system applies 60 percent of the rear axle momentum, and 40 percent on the front axle. If necessary, that is, if the circumstances of driving change, the system is able to modify this distribution relationship in second fractions.
Early analysis and precise activation thanks to the inclusion in the same network
The XDRive total traction system is considered intelligent because it is capable of detecting early if one or several wheels threaten to slip, so it can counteract the situation by intervening immediately to modify the distribution of force. In this preventive analysis of dynamic conditions, the system resorts to the data available in the ICM on engine control, the accelerator position, the wheel turn, the wheel speed and the lateral acceleration of the car. Having this large amount of information, the XDRive system is able to dose the distribution of force between the two axes with such precision that all the power of the engine can be used. Unlike conventional total traction systems, which only react when a wheel is already skating, the XDRive counteract system from the beginning the danger of a giving or subviring of the car. If, for example, the car threatens to leave Morro, the system immediately applies a majority of the driving force in the rear wheels. Next, the car draws the curve with greater precision, which means that the XDRive system manages to optimize the stability of the car before the driver even noticed the need to recover stability. The system prevents the car from delays in the same preventive way, counteracting the survival by applying the surplus of force on the front axle. Under these conditions, the advantages of total traction are available before one of the four wheels starts to slip.
The intelligent distribution of the moment of promotion also results in a higher level of comfort. The stabilizer effect of the XDRive system results in the DSC system only intervening in extreme situations. The DSC control system only intervenes by reducing the motor torque or activating the brakes of the wheels that correspond if the optimal distribution of the force is no longer enough by itself so that the car maintains its trajectory.
Fast reactions thanks to electronic regulation
Thanks to the electronic regulation of the XDRive system it is possible to distribute the force very quickly between the front and rear wheels according to the changing dynamic situations of the car. Central differential disco coupling is regulated by an electric motor. By increasing the pressure that acts on the discs, additional force is applied to the front axle through a gear system. When the discs open completely, all force is applied only to the posterior wheels. Precisely because it is an electronic regulation system, the change in the relationship is carried out in record time. In just 100 thousandths of a second, the coupling can be opened or closed completely.
The control performance contributes additionally to improve the dynamic behavior of the car. This electronically controlled system deals with dosing the braking force in a very precise way, and compensates for the moments of rotation through the XDRive regulation electronics, couping any tendency to subviring by quickly drawing a curve and, in addition, thus reaching greater maneuverability. At the time in the car tends to leave Morro, the XDRive regulation electronics and the DSC specifically activate the rear wheel brake inside the curve. The loss of impulse force that occurs, is compensated by increasing power.
