What we have all been waiting for!
Information about the AWD 4Matic system
This might be specific to the AMG or not.
Information about the AWD 4Matic system
This might be specific to the AMG or not.
Sounds like a good performance AWD. I am excited.Performance-oriented AMG 4MATIC all-wheel drive
The 2014 CLA45 AMG features variable AMG 4MATIC all-wheel drive as standard. In developing this all-wheel-drive system, the focus was on "performance" and "dynamic spirit." The power transfer to the rear drive train is facilitated by a compact power take-off unit (PTU), which is fully integrated into the 7-speed sports transmission. Its lubrication is supplied by the oil circuit of the sports transmission. This configuration results in substantial weight advantages compared with rival systems, which branch off power by means of an add-on component with dedicated circuit. Together with the friction-minimized tapered roller bearings, the PTU delivers excellent efficiency. As an additional bonus, the system weight of the new AMG 4MATIC all-wheel drive is up to 25 percent less than the all-wheel-drive versions offered by the competition. A two-part propeller shaft transfers the power of the AMG 2.0-liter four-cylinder turbo engine to the rear axle. In the interests of favorable weight distribution, an electrohydraulically controlled multi-disc clutch is integrated into the rear axle differential. The multi-disc clutch immediately detects slip at the front axle. A hydraulic pump instantaneously presses the discs together and channels the engine torque to the rear wheels as necessary. All this takes place virtually unnoticed by the driver. To enable particularly fast response, the pump is always active and does not require to be started up each time it is needed, as is usually the case with other systems. Torque split is fully variable: in normal driving, the CLA45 AMG has front-wheel drive bias in the interests of optimum efficiency. If the driving dynamics require, the variable AMG 4MATIC all-wheel drive splits the torque between front and rear axle at a ratio of up to 50 : 50 percent. The variables influencing the torque split ratio are vehicle speed, lateral and longitudinal acceleration, steering angle, speed difference between the individual wheels, selected gear and accelerator position.
