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1 Series - E82 Coupe (2007 - ...) - Saving Energy

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1 Series - E82 Coupe (2007 - ...)
Exterior Design
Aerodynamics Package, EfficientDynamics and Turbos
Diesel, Turbos and Brake Energy Regeneration
Saving Energy
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Mechanical disengagement of ancillary units to save energy.
Further improvements serving to reduce fuel consumption are fully automatic.
One example is that the BMW 1 Series Coupé powered by the new four-cylinder diesel engines comes with automatic control of the air flaps in the radiator grille: As long as the engine does not require any cooling, the flaps remain closed in the interest of significantly improved aerodynamics and a further reduction of fuel consumption.
A further point is that numerous ancillary units are operated only when required in order to save energy. The EPS Electric Power Steering, for example, only consumes energy when steering assistance is really required, that is when the driver is actively moving the steering wheel.
Hence, energy consumption is reduced to zero when driving straight ahead and in a steady bend without any additional movement of the steering wheel.
The new electrical coolant pump, to mention another example, is temperature-controlled and no longer operates as a function of engine speed, as in the case of a conventional pump. Being activated, therefore, only when really required, the new coolant pump again serves to enhance engine efficiency, consuming only about 200 watt, approximately one-tenth of the drive energy required for a conventional pump, which otherwise would have to be permanently developed by the engine.
Yet a further improvement is the clutch on the belt drive for the a/c compressor, allowing the compressor to be switched off automatically as soon as the driver switches off the air conditioning and again reducing the compressor’s drag momentum to a minimum.


EfficientDynamics also on the automatic transmission.
As an alternative to the manual gearbox, the BMW 120d Coupé is available as an option with six-speed automatic transmission – and the other engine variants will also be available with this automatic transmission in future.
Featuring new converter technology with an integrated torsion damper, the automatic transmission reduces the loss of energy and ensures even shorter reaction and gearshift times, with the BMW 1 Series Coupé offering the joy of superior sportiness also in combination with an automatic gearshift.

High-tech suspension with newly developed final drive.
In typical BMW style, the new BMW 1 Series Coupé transmits the power of the engine to the rear wheels and from there on to the road. This design concept and configuration – engine at the front, drive wheels at the rear – guarantees optimum traction, good weight distribution front-to-rear, excellent directional stability, and safe handling. And the separation of drive power and steering, to add a further important point, gives the car extremely agile driving behaviour at all times.
The rear axle of the BMW 1 Series Coupé is a five-arm construction reflecting the requirements of the car’s particularly powerful and high-torque engines.
The advantage is extremely precise wheel guidance, again offering a high standard of performance in the car’s overall set-up. And at the same time the drive axle is insulated ideally in terms of acoustics and possible noise transmission.
The final drive on the Coupé comes from a new generation of final drive units optimised for running smoothness. Featuring double-helical ball bearings for the first time, the final drive runs at an even lower operating temperature reached more quickly than before thanks to the reduction of fluid required in the final drive transmission.
Again, both of these improvements benefit the function and service life of the final drive which is furthermore able, despite its smaller and more compact dimensions, to transmit roughly 10 per cent higher forces than before.
The front axle on the BMW 1 Series Coupé is also built to a standard quite unique in the compact segment: The double-joint spring-strut tiebar axle with its anti-roll bar is made largely of aluminium, offering an optimum combination of superior stiffness and low weight – which, together with the very stable track control arms and thrust rods, as well as exact wheel guidance, makes an important contribution to the car’s driving dynamics.
As the entry-level model into the range, the BMW 120d Coupé comes with 16-inch light-alloy wheels, while the BMW 123d Coupé is fitted as standard with 17-inch light-alloy wheels. In both cases the wheels come on tyres with reduced roll resistance making a further contribution to the car’s fuel economy.
As the top version in the range, the BMW 135i Coupé features 18-inch light-alloy wheels highlighting the car’s active performance and dynamism.
And as yet a further feature the BMW 135i Coupé comes as standard with M Sports Suspension and a high-performance brake system incorporating six-piston fixed callipers on the front axle and two-piston fixed callipers at the rear.


Electric Power Steering for supreme steering precision.
The new four-cylinder diesel versions of the BMW 1 Series Coupé come as standard with EPS Electric Power Steering featuring integrated Servotronic for speed-related steering assistance. As a result, EPS offers even greater steering precision at high speeds and enhanced steering comfort at low speeds.
A further important point is that the new steering system reduces fuel consumption by using an electric motor – and not a conventional mechanical/hydraulic system – to boost the car’s steering, with the electric motor operating only on demand, that is when the driver is actually turning the steering wheel.
As an option the BMW 1 Series Coupé may be equipped with the world’s only Active Steering adjusting the steering transmission with optimum precision to the current speed of the car. This means that the driver is required to turn the steering wheel only slightly and with minimum effort when parking, while at higher speeds the steering transmission becomes less direct, improving the feeling of the steering and directional stability accordingly.

Last Updated on Monday, 12 April 2010 14:43  

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