The adaptive cruise control (ACC) sensor is used for the Porsche Active Safe (PAS) functions.
Prefilling the brake system
Prefilling of the brake system if the radar sensor detects a critical approach to a moving obstacle in order to bridge play and to improve responsiveness.
In the event of an emergency braking operation where the pedal force is insufficient, a brake booster provides the braking pressure necessary for maximum deceleration at all 4 wheels.
It reduces the trigger threshold of the brake assist system if the sensor detects a critical approach to a moving obstacle. Depending on the degree of severity of the hazardous situation, the trigger threshold of the brake assist system is reduced in three stages.
The brake pressure can be increased appropriately to the situation if the radar sensor simultaneously detects a critical approach to a moving obstacle and insufficient braking force. If necessary, the full force of the brakes is applied.
All Porsche Active Safe (PAS) functions are active for speeds in excess of approx. 20 mph ( 30 km/h).
Latent warning (visual)
Fig. 9: Visual latent warning
If the distance when traveling behind another vehicle for a long period is too small to avoid a collision if the vehicle ahead were to brake, the latent warning (yellow icon) appears on the multifunction display to warn the driver.
Increase the distance from the vehicle in front as necessary.
Prewarning (visual and acoustic signal)
Fig. 10: Prewarning
If the radar sensor detects a critical approach to a moving obstacle ahead with a high potential for collision, the visual and acoustic prewarnings are given to warn that evasive action can be taken to avoid the collision.
Chance of collision with the vehicle ahead