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29 Feb 2012

New BMW xDrive 640d

  • Written by Aitor

BMW expands its range of models in the series 6 adding a new variant of the coupe and cabrio. In the spring of 2012 be launched to the market the BMW Coupe and BMW xDrive 640d 640d xDrive Convertible. Thus for the first time combines intelligent all-wheel drive system in the BMW 6 series with a diesel engine with BMW TwinPower Turbo technology.

The new BMW xDrive Coupé 640d accelerates in just seconds 5,2 0 to 100 km / h. The diesel 230 kW / hp propeller 313 offers excellent efficiency thanks to BMW TwinPower Turbo technology. Combined with manual sport eight-speed automatic transmission featured as standard, the fuel consumption and emissions are exemplary. XDrive distributes accurate torque variably between the wheels of the two axles. The electronic control system, including the network dynamic control system DSC (Dynamic Stability Control) stability, ensures excellent traction, maximum safety, excellent handling and optimum power delivery under all weather conditions and on any type of road. Average fuel consumption of BMW xDrive Coupé is 640d 5,7 to 5,8 100 liters kilometers (measured values ​​according to EU test cycle depending on the size of the tires). The corresponding values ​​ranging from 2 CO149 to 153 grams per kilometer.

6 diesel engine cylinder with BMW TwinPower Turbo technology

The diesel engine used in models 6 Series BMW offers an immediate response and powerful acceleration capacity and recovery silently.

The above model range of BMW Series 6 had first included diesel engine models. The latest generation of the most powerful diesel engine has a displacement of 3.000 cc, an aluminum crankcase weight optimized and features the BMW TwinPower Turbo technology of last generation. The technology applied in this model includes a turbo charge in phases and common-rail direct injection with piezo injectors apply a maximum pressure of 2.000 bar system. The two-stage turbo overload results in a spontaneous and passionate delivery of both power. The injection system ensures precisely metered fuel supply and allowing for efficient and clean combustion.

Two stage turbo optimized efficiency

The new implementation of the two-stage turbo system reacts more precisely than ever to the demands at all times the dynamic situation of the car. A low speed is first activated a small turbo unit which reacts particularly rapidly due to its minimum moment of inertia. The compressed air from this unit is fed directly to the combustion chambers via a bypass type. Since air does not pass through the charging unit larger, no losses occur when the pressure generated. If the driver accelerates demanding greater load, the electronic control system activates the turbo bypass larger unit. The responsiveness of the turbo system, and be defined by the solicitation at any time, achieves optimized by the variable turbine geometry of the small turbo unit.

In this way any movement especially spontaneous throttle reactions are obtained. The maximum engine torque is available 630 Nm at very low engine speeds between 1.500 2.500 and revolutions. The engine delivers its maximum power at rpm 4.400. Under these conditions, the car has a very dynamic behavior and can accelerate from any speed vehemently. Since the box sporting eight-speed automatic transmission has been carefully tailored to the performance characteristics of the engine, the most efficient use of available high torque over a wide range of stress, allowing opt for a sporty driving style safe all at once. If the ECO PRO mode is activated, also included as standard, efficiently leverage the power reserves of the sporty drive to promote a relaxed and less consumption driving at low revs.

BMW EfficientDynamics technology package and Experience Control switch serial

The ECO PRO mode is activated with Control switch as standard, affects the motor control system in the characteristic of the accelerator and the behavior of the automatic transmission. Additionally specifically controls the power consumption of the electrical equipment of the car, such as climate control, heated seats and exterior mirrors, thus improving the efficiency of energy management. Various special indicators report, among others, on the greater autonomy achieved in this way, in kilometers. The BMW EfficientDynamics technology embodied in the BMW xDrive Coupé 640d includes, among others, the system recovery of braking energy, the Auto Start / Stop function, activation of the side groups as needed and automatic control tops inlets.

With the Control switch can be activated modes "SPORT", "SPORT +" and "COMFORT" and, in combination with optional equipment DDC (Dynamic Ride Control) or, respectively, Adaptive Drive, you can also activate the "COMFORT +" mode. The Control switch affects the accelerator pedal progression, responsiveness of the engine, the characteristic curve of the power steering, the system response thresholds of the DSC stability control, dynamic gearshift box automatically and additionally also on the line of the damping characteristic of the system and removal of the side slopes. Selecting either mode, the driver activates a complete and consistent setting previously stored, including the engine sound that can be perceived in the cockpit. The engine sound is amplified for transmission to the carrier through a sound module, considering the driving conditions and the chosen mode with Control switch. The digital signal processing uses directly to the signals emitted by the engine control unit, considering the speed, torque and speed of the car. Thus, the driver obtains a very accurate information on the degree of stress on the motor.

Intelligent AWD system

The BMW xDrive Coupé 640d the latest intelligent AWD system, in addition to variably distribute the force between the wheels of the two axles, also includes the Performance Control feature to distribute the drive power between the two is included wheels on the rear axle as required by the situation.

Unlike conventional all-wheel drive, the electronically controlled BMW xDrive not only optimizes the traction on slippery surfaces, and further increases the dynamic properties of the car when cornering. Including the AWD system, the system stability control DSC (Dynamic Stability Control) and the management system chassis ICM (Integrated Chassis Management) on the same network, it is possible to detect and analyze any dynamic situation, in order time to activate the corresponding control systems. The system can be limited to the management of xDrive, but may also include activation of the regulatory system of the DSC stability and Performance Control. The force distribution varies rapidly and accurately, so that the car maintains maneuverability distinguishes all vehicles of the BMW brand but the driver is drawing curves at high speed.

The AWD system used in models 6 Series BMW has a specific setting, considering its properties and dynamic characteristics. The system respects a fundamental principle of the brand while maintaining the advantages of the rear-wheel drive typical of BMW models and taking advantage having the force distribution to all four wheels, resulting in a harmonious result. During normal operating conditions, any model of BMW provided the intelligent AWD system applies the 60 percent of the drive torque to the rear axle, and 40 percent on the front axle. If necessary, ie, if circumstances change driving, the system can change in a split second the distribution ratio.

Early activation analysis and accurate thanks to the inclusion in the same network

The xDrive AWD system is considered intelligent because it can detect early if one or more wheels threaten to slip, so you can counter the situation immediately intervene to modify the distribution of force. This preventive analysis of the dynamic conditions of the system relies on the data available in the ICM of the engine control, the throttle position, the steering angle, the rotation speed of the wheels and the lateral acceleration of the car. By disposing of this large amount of information, xDrive is able to dose the force distribution between the two axes with such precision that can harness the full power of the engine. Unlike conventional all-wheel drive systems, which only react when a wheel is already skating, xDrive outset counteracts the danger of oversteer or understeer of the car. If, for example, leave the car threatens to nose, the system immediately applies more of the driving force at the rear wheels. Then the drive traces the curve more accurately, which means that optimizes xDrive car stability even before the driver becomes aware of the need to restore stability. The system prevents the car skidding it preventively, counteracting the oversteer by applying excess force on the front axle. Under these conditions it has the advantages of all-wheel before one of the four wheels begin to slip.

The intelligent distribution of drive power also results in a higher level of comfort. The stabilizing effect of the xDrive system results and the DSC system intervening only in extreme situations. The DSC system intervenes only Control reducing engine torque and activating wheel brakes that apply if the optimal force distribution is not sufficient in itself to the car maintains its course.

Fast reactions due to electronic regulation

Thanks to the electronic control of the xDrive system can quickly distribute the force between the front and rear according to the changing dynamic situations car wheels. The coupling disc center differential is controlled by an electric motor. By increasing the pressure acting on the discs additional force on the front axle are applied via a system of gears. When disks are fully opened, the entire force is applied to the rear wheels only. Precisely because it is an electronic control system, the ratio change takes place in record time. 100 In just milliseconds, the link can be opened or closed completely.

The Performance Control further contributes to improved driving dynamics. This electronically controlled dispensing system handles the braking force in a very precise manner, and compensates torques through regulating electronics xDrive precociously counteracting any tendency to understeer to quickly draw a curve and also reaching well greater maneuverability. At the moment the car tends to go too nose, the control electronics and the DSC xDrive specifically activate the brake of the rear wheel on the inside curve. The loss of drive force thus produced is compensated by increasing the power.

Viewed 16742 times Last modified on Tuesday April 15 2014 10: 13
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