With the modular front wheel drive platform – in short: the MFA (Modular Front Architecture) Mercedes-Benz model range since 2012, extremely successfully extended to the bottom. Out of the class, including the GLA and the CLA coupe came in addition to the A – and B -. In 2013, the all-wheel drive 4MATIC came with in the compact segment, the Stuttgart-based. The successor platform – MFA2, should and has led to the success of this.
Modular Front-wheel Architecture MFA
The second Version of the platform for the Compact – MFA2, should not only enable the use of new technology, but also offers more space and parallel for even more models are suitable. Currently, not only the A-class and A-class sedan (with the long-wheelbase version for China), but also of the CLA as a coupe and Shooting Brake, the B to run on the MFA2 platform class as well as in the future, the new GLA from the Band.
The MFA2 platform offers a greater bandwidth of potential applications, if one compares this with the previous platform. The architecture is not only designed for different wheelbases and track, but also takes into account alternative drive concepts such as electric drives up to a fuel cell. The platform does not bewährleistet for this purpose, only the retention of the four-cylinder engines-concept, but also features two rear axles for internal – combustion engine and electric motors as well as for a double-clutch transmission with up to 8-speed compatible.
Further development of the all-wheel drive 4MATIC
Further technical Highlights, such as the development of the 4MATIC all-wheel drive, the development of requirements Hand-made-in-Hand with the construction of the MFA2 come. The drive should need less space and easier to be lowered, parallel to the fuel consumption and emissions are also reduced. The all-wheel drive should not be only for 7G-DCT compatible, but also for the new 8G-DCT automatic transmission and is supposed to behave in a better response and a better all-wheel drive performance. So the 4MATIC with a electric was developed-mechanically controlled rear-axle transmission.
But what does this mean exactly ? Aam tried-and-tested concept of the MFA held the MFA2 developers continue to be: The drive concept runs on a demand-oriented distribution of torque between the front and rear axle in dependence on the wheel slip of the front wheels. In this case, the principle applies in the case of the control of the 4MATIC “As often as necessary, as rarely as possible“. That is, if it is allowed by boundary conditions, drive the all-wheel-drive models almost exclusively in the economic front-wheel drive mode. The roadway, however, is slippery or uphill steeper, the rear-wheel drive automatically to an optimum drive.
The distribution of the Drive torque, the automated dual clutch transmission 7G-DCT and the 8G-DCT (at the MFA: only 7G-DCT) takes over in Combination with a rear-axle gear with integrated, electro-mechanically controlled multi-plate clutch (in the case of MFA: electro-hydraulic control).
The change from the electro-hydraulically controlled multi-plate clutch in the rear axle to an electro-mechanical control is the key new step of development. It allows for a faster and more efficient way of driving than the previous System.
The technical process is as follows: An electric motor exerts on a ball-ramp concept an axial force on the clutch pack to open the slats or to close. The rear axle differential compensates for the different speeds of the rear wheels.
Better driving dynamics and efficiency
The advantages show up particularly for a better driving dynamics and better efficiency. The new System provides a faster torque build-up by pilot control of the clutch is already in the Stand and a speed-independent Operation of the slats over the entire adjustment range. The technique is also used in the Performance area. Not for nothing is the AMG Performance 4MATIC (e.g. in the case of Mercedes-AMG A-35) is electro-mechanically controlled clutch to the rear axle.
The ball-and-ramp concept runs parallel to a higher degree of efficiency. The new rear axle transmission is a compact, one kilogram lighter and requires a smaller quantity of Oil. This is reflected in lower fuel consumption and emissions. And not to forget: Also the focus on the front-wheel drive as the base setting, the compact vehicles with 4MATIC fuel saving compared to a continuous all-wheel drive.
Icon images: Daimler AG
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