Power door locks

The central locking system allows the simultaneous locking and unlocking of all doors and usually also of the flaps ( tailgate, fuel flap ) of a vehicle by operating one of the castles or by remote control.

The first widespread systems relied on a pneumatic actuator with a vacuum - memory from the engine intake (Mercedes- Benz), and later with a separate compressor. The now common design but is electrically operated, usually combined with a wireless remote control on the key, so that tripping is remotely possible without direct contact with the vehicle. In connection with a remote control, a lock is present in most newer vehicles for cost reasons only in the driver's door. Also, combined systems in use (Mercedes- Benz), using both radio and infrared technology. The vehicle can thus be remotely by radio to lock and unlock; up close - with direct eye contact with the infrared receiver on the driver's door - can be opened automatically and close the windows and / or sunroof.

From the inside to operate the central locking by pushing in or pulling out the Türverriegelers, opening the driver's door or by activating a separate switch can take place. Currently, however, many vehicles are no longer equipped with visible Türverrieglern; the central locking system is then activated from the interior only by a switch. In addition, many modern vehicles are (eg 8 km / h) automatically locks when crossing a certain rate. This is to prevent an unauthorized person from, for example when stopping at traffic lights outside can open the door to the occupants to surrender valuables or even the vehicle to compel (see Predatory attack on drivers). The doors are unlocked again as soon as the ignition key is removed from switch (eg Seat Ibiza ), if one of the doors is opened from the inside ( eg Renault Clio, Mercedes -Benz ) or in the event of an accident, the is registered by the crash sensors.