Porsche Traction Management

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.