PTM – Porsche Traction Management System

Porsche Traction Management (PTM) is a system consisting of all-wheel drive with electronically controlled multi-plate clutch, automatic brake differential (ABD) and anti-skid device (ASR). Power distribution between the front and rear axles no longer takes place via a viscous multi-plate clutch, but actively through an electronically controlled multi-plate clutch.

Unlike the viscous multi-plate clutch, which only adjusts the force intensity when there is a difference in speed between the front and rear axles, the electronic multi-plate clutch responds much faster. Thanks to the constant monitoring of the driving conditions, it is possible to intervene in various driving situations: sensors constantly detect the number of revolutions of all wheels, lateral and longitudinal acceleration, as well as the steering angle. Thus, an analysis of the data recorded by all sensors allows the driving force to the front axle to be optimally and timely regulated. If during acceleration the rear wheels run the risk of slipping, the electronic multi-plate clutch engages more decisively, transferring more power to the front axle. At the same time, ASR prevents wheel spin. When cornering, the driving force to the front wheels is always sufficient to prevent any negative influence on the vehicle's lateral reaction. On roads with different coefficients of friction, the rear transverse differential, together with the ABD, further improves traction.

In this way, PTM, together with Porsche Stability Management PSM, ensures the correct distribution of the driving force for optimal road grip in all driving situations.

The main advantages of the PTM are especially evident on wet roads or snow, where the acceleration ability is amazing.

The result: high safety, outstanding performance. An extremely intelligent system.

Source: Porsche.com