Adaptive Cruise Control (ACC)
Adaptive Cruise Control (ACC)
Adaptive cruise control is optionally available. It uses radar sensors to monitor the distance from the vehicle in front, automatically maintains the distance and brakes if the distance to the vehicle in front is reduced - if necessary bringing the vehicle to a complete stop. The programmable speed range extends from 20 - 130 mph (30 - 210 km/h).
In automatic acceleration mode, the adaptive cruise control (ACC) behaves like the conventional cruise control function and maintains the selected target speed. However, ACC can also maintain a constant speed when driving up or down hill through activation of the braking system or downshifts. Adaptive cruise control relieves the driver of the task of adjusting the target speed to the dynamic traffic conditions. It has been enhanced from a pure cruise control function to a distance control system. If no vehicle is detected in front, the desired speed is reset. If a vehicle is detected in front, the system attempts to keep the time interval (speed-dependent distance) with this vehicle as constant as possible.
The distance is measured with a radar sensor (long range radar with 76 - 77 GHz), which is installed in the center of the front apron.
Similar to the Porsche Panamera, the adaptive cruise control of the new Cayenne offers the customer the special functions of overtaking aid, boost function and cornering speed control.
Boost function
If the actual speed is less than the selected target speed, e.g. when driving off from a standstill, the driver can activate a "boost" function at any time when the system is active. This is done by holding the cruise control operating lever upwards (resume direction).
NOTE:
- Activating and deactivating Porsche "Active Safe".
- The Porsche "Active Safe" functions can be switched off completely or partially in the multi-function display. The settings are saved when the ignition is switched on or off.
Cornering speed control
When driving around a bend in free driving mode, the cornering speed control function intervenes if a specific lateral acceleration is exceeded. At low speeds, system intervention is triggered by the steering angle, e.g. when driving on a roundabout.
As a result, acceleration is reduced or interrupted or the actual speed is reduced so that the lateral acceleration is also reduced. When the vehicle comes out of the bend, controlled acceleration is resumed or the speed is adapted to the target speed in a controlled manner (if the control function was not interrupted).
The "Follow to Stop" and Porsche "Active Safe" functions have been enhanced in the context of active safety.
Follow to Stop
As in the Panamera, the system readies the brakes whenever a decreasing distance to the vehicle in front is detected in order to reduce the stopping distance if required. Adaptive cruise control and PSM also interact to prefill the brake system. In following mode, the vehicle decelerates smoothly to a stop if the vehicle in front stops (adaptive cruise control "Follow to Stop" mode). The required vehicle deceleration calculated by the adaptive cruise control is regulated via the PSM by actively changing the braking pressure at the wheel brakes (at a maximum of 3.5 m/s2), so that the distance to the vehicle in front selected by the driver can be maintained. To increase driver comfort, the system activates a crawl phase before finally coming to a stop so that if the vehicle in front only stops briefly, the driver's own vehicle does not actually stop at all and a fluid, slow movement is possible. The driver can drive off after a stop or confirm this by pressing the operating lever or the accelerator pedal.
Porsche "Active Safe"
The system also warns the driver in dangerous situations visually and acoustically as well as for the first time with an additional short braking jolt. This alerts the driver to critical situations. The active safety functions operate independently of activated distance and cruise control. However, there is no response to stationary obstacles.
If there is no braking response from the driver to the advance warning, this is followed shortly afterwards by the acute warning, which consists of a braking jolt and simultaneous acoustic and visual warning. A braking jolt is applied to the vehicle through a very short build-up of brake pressure. This also ensures that the driver's attention is drawn to the traffic. The driver can still prevent a collision by responding appropriately in this dangerous situation.
In combination with adaptive cruise control, an adaptive cruise control display can be shown on the color display of the instrument cluster, with comprehensive information such as target and actual distance, desired speed or speed of the vehicle travelling in front.
In this mode, a speed bar in the colour display shows how much of the available target speed range (19 to 130 mph/30 to 210 km/h) is currently being utilized. Time interval bars, speed bars, desired speed and the speedometer symbol are shown in orange when control operation is active. If the system is only switched on ("standby") but is not active, the display elements named are grey.
The operating states are displayed via the color display in the instrument cluster in the ACC menu. Warnings are also accompanied by an acoustic signal.