PSM (Porsche Stability Management)

PSM (Porsche Stability Management)

Like the current 911 models with all-wheel drive, the new Cayenne models also feature enhanced Porsche Stability Management (PSM). PSM improves active safety thanks to the following additional functions:
- Enhanced braking readiness
- Brake assist function
- New ABS tuning for braking on loose surfaces

Enhanced Braking Readiness

When the accelerator is released quickly, PSM switches the brake system to a state of enhanced braking readiness: Brake system pre-filling builds up slight pressure in the system. This moves the brake pads slightly on to the brake discs. If the driver then actually presses the brake, maximum braking power can be achieved more quickly. This results in a shorter stopping distance.

Brake Assist

On identifying full braking i.e. when a defined force is exceeded on the brake pedal - brake assist supplies the required brake pressure for maximum deceleration via the PSM hydraulic unit. Brake assist can be deactivated by switching off PSM. Enhanced braking readiness always remains active, however, irrespective of whether PSM is on or off.

Off-road ABS

The off-road ABS system used since model year 2004 has been optimized further.

Off-road ABS control in "Low Range" can now be used for a speed range of up to 50 mph (80 km/h). The ABS control strategy has been modified for braking on unpaved surfaces for conditions such as; when loose gravel, sand or snow build up in front of the tires and create an blocking barrier and locking of the wheels improves control. Off-road ABS is only active when driving straight ahead. If the driver needs to steer, off-road ABS control is switched off automatically to maintain steerability.

Off-road driving in "High Range" mode, the ABS control system that has been optimized to suit the conditions is activated when the driver brakes at a speed of up to 50 mph (80 km/h). Also in this case, for conditions such as; when loose gravel, sand or snow build up in front of the tires and create an blocking barrier and locking of the wheels improves control.