2007-02-14 07:13:33 · 4 answers · asked by oilhead4valve 1 in Science & Mathematics ➔ Engineering
Unclear what is meant by this. One scheme which could be called central locking is use electromagnetic cards as keys; there is a sensor at each door which reads the card, inquires of a central computer whether it is valid, and if the computer says okay, it sends out a signal to unlock the door.
2007-02-14 07:17:45 · answer #1 · answered by Anonymous · 0⤊ 0⤋
On each door is an solenoid, when you unlock one door it triggers the other solenoids to unlock the other doors. Likewise when you lock a door.
You can activate them by a keyfob, key or if you have a more expensive Mercedes a card, either way all the solenoids will open or close together.
I find in my car if i want to lock or unlock one of my doors the rest automatically do the same. I can't have one door locked and one not.
I believe the solenoids are controlled by the ECU.
Some cars have deadlocks which is a further actuator.
I am not sure if alarm systems use extra switches on the doors, use the light switches or monitor the actuators.
Jon
2007-02-14 17:59:58 · answer #2 · answered by Jon T-W 2 · 0⤊ 0⤋
its when the locks all go down together when you lock one door.
2007-02-14 15:16:14 · answer #3 · answered by Humble Bee 2 · 0⤊ 0⤋
there is one god key that locks all door when applied to one door.
2007-02-14 15:18:11 · answer #4 · answered by gjmb1960 7 · 0⤊ 0⤋