Emergency close

Emergency closing is a function for deliberate closure of the sliding/tilt sunroof without anti-trap function (limitation of closing force). It can be necessary to resort to this function if someone attempts to reach into the interior of the car or if mechanical difficulty is experienced in closing the sliding/tilt sunroof.

Emergency closing can be activated when the car is stopped or travelling at a speed up to 16 km/h.

Emergency closing is a two-phase operation:

Phase 1: 

Press the sliding/tilt sunroof switch (in the "close" direction") to the mechanical stop. A short response time elapses before the sliding/tilt sunroof closes at maximum speed.

If the sliding/tilt sunroof switch is released, the sliding/tilt sunroof automatically closes (with anti-trap function). Closure is interrupted if the anti-trap function sensor trips. The direction of travel reverse and the sliding/tilt sunroof opens by approximately 20 mm.

Phase 2: 

If the sliding/tilt sunroof switch is released in phase 1 and the sliding/tilt sunroof switch is then pressed again past the pressure point within approximately 1.5 seconds, the sliding/tilt sunroof closes without anti-trap function. In this mode, the sliding/tilt sunroof closes with maximum force and maximum speed. If an obstruction is encountered the motor continues to receive power until the thermal switch trips to prevent overheating.

The sliding/tilt sunroof can be opened at any time, even if the thermal switch has tripped.

Anti-trap function (limitation of closing force) 

Anti-trap function is active over the entire range of movement in the closing direction. Anti-trap function does not in principle prevent trapping; instead, it limits the maximum permissible force applied to the trapped object (limitation of closing force).

Two Hall sensors are integrated into the motor in order to prevent impermissibly high closing forces. The speed of closure can be measured on the basis of the signals from these two Hall sensors. The closing force is calculated from the speed of closure.

Irrespective of temperature and the voltage in the on-board network, the sliding/tilt sunroof opens approximately 20 mm if the anti-trap function is tripped.

The mechanical forces involved change with ambient temperature and as a result of ageing processes. Consequently, the closing force (mapping) is relearned each time the sunroof closes, so that the anti-trap function can adjust accordingly.

In each subsequent closure, the closing force currently needed is calculated and compared with the characteristic map. If the difference between these two force values is above the preset tripping threshold, the sliding/tilt sunroof immediately opens. The anti-trap function can be deactivated by the emergency close function (see Emergency close).

Automatic closing is not possible if anti-trap function fails (on account of defective Hall sensor, for example).

Interference affecting the closing force can occur when the car is in use. Interference of this nature can take the form of severe vibrations, slipstream (sliding/tilt sunroof in tilted position) and stiff action on account of coldness or a build-up of foreign matter. Interference of this nature is detected by the system. Unexpected difficulties caused by build-up of foreign matter, ice or damage can be overcome by the emergency close function.