The excellent aerodynamics are crucial to this high efficiency: with the GLA, yet another model series is set to become the leader in its segment with respect to aerodynamic efficiency. It has a Cd value of 0.29. At 0.66 m2 the drag area, Cd x A, which decisively affects fuel consumption from around 60 km/h, is also outstanding.
A host of other measures, from in-engine optimisation to intelligent lightweight design, also help to reduce fuel consumption and CO2 emissions. The most important measures at a glance:
•For all petrol and diesel powertrains: Friction- optimised engines with turbocharging, direct injection and thermal management; petrol engines with CAMTRONIC (GLA 200).
•Friction-optimised 6-speed manual transmission and 7-speed dual clutch automatic transmission, both featuring high-geared configurations.
•Regulated fuel and oil pump are able to adjust pump output according to required load.
•Intelligent generator management in conjunction with an efficient generator ensures that consumers are powered from the battery during acceleration, while during braking part of the resulting energy is recuperated and fed back into the battery.
•Highly efficient air conditioning compressor with optimised oil management, reduced displacement and magnetic clutch which avoids friction losses.
•With the electromechanical Direct Steer system (standard on all models), the power steering requires energy only when the driver actually turns the steering wheel.
•Wheel bearings with substantially reduced friction.
•Use of tyres with optimised rolling resistance.
•Weight optimisation through the use of lightweight materials.
Increased use of recycled and natural materials
The GLA-Class already currently meets the recoverability rate of 95 percent by weight, which will be mandatory as of 2015. The European ELV Directive 2000/53/EC additionally requires vehicle manufacturers to continually increase the input of recycled materials in their production processes. In all, the new GLA-Class incorporates 41 components representing a total weight of 35.9 kilograms which can be produced with the partial use of high-quality recycled plastics.
There is also an increased emphasis on closed automobile materials cycles: the wheel arch linings, for example, are made from reprocessed starter batteries and bumper coverings.
In all, 46 components in the new GLA-Class with a total weight of 21 kilograms are made using natural materials. The load compartment cover is partially made from recycled paper, for example, and is only half as heavy as a conventional component. A multi-patented material composition and the attendant manufacturing process furthermore reduce CO2 emissions during component production by 60 per cent.
(March 12, 2014)