Porsche Traction Management
WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.
Porsche Traction Management, or PTM, is a system which guarantees or improves the traction of the vehicle. Two controllable locks are available in the system.
It operates permanently and receives values from different sensors (e.g. steering-angle sensor, lateral acceleration sensor) from which the corresponding lock controls are obtained. In this way the optimum power is distributed to the drive wheels.
The locks are:
- Longitudinal lock (in the transfer box): Distributes the moment released by the gear via the cardan shafts to the front or rear axle gear.
- Longitudinal interlock (depending on the equipment in the rear final drive): Distributes the moment to the two rear driving wheels.
- Centre-differential lock (in the transfer box): Distributes the moment released by the gear via the cardan shafts to the front axle final drive or rear axle differential.
- Rear-differential lock (depending on the equipment in the rear final drive): Distributes the moment to the two rear driving wheels.