Fitted as standard on the Panamera 4, Panamera 4S and the Panamera Turbo models, Porsche Traction Management (PTM) comprises an active all-wheel drive with electronic and map-controlled multi-plate clutch with automatic brake differential (ABD) and anti-slip regulation (ASR).
The electronically controlled multi-plate clutch regulates the distribution of drive force between the permanently driven rear axle and the front axle. Through continuous monitoring of the driving conditions, the electronics are able to respond to a variety of situations. Sensors check, among other variables, the rotation speeds of all four wheels, the longitudinal and lateral acceleration of the vehicle, and the steering angle.
If the rear wheels threaten to spin under acceleration, a greater proportion of drive force is distributed to the front by a more powerful engagement of the multi-plate clutch. In addition, ASR reduces wheel slip. When cornering, the front wheels only ever receive as much drive force as is necessary to maintain optimum lateral stability.
In this way, PTM, in conjunction with the enhanced Porsche Stability Management (PSM), ensures that the perfect distribution of drive is achieved every time: whether on long straights, through tight corners, or on surfaces with different friction coefficients. In this situation, traction is additionally enhanced by the automatic brake differential (ABD).
Whenever the brake control systems are required to intervene, PTM decouples the front axle completely so that PSM interventions can take place at each individual wheel.