Mechanical code protection for vehicle central locking system - has key with coded pattern on shank to preset array of security switches

摘要

The central locking system uses a special key with a pattern on the shank. This operates on an array of spring loaded switches, to open and close certain connections in a logic circuit. This inactivates the coding and operates the various locking servo motors in the correct direction. The mechanical coding is simple and has a large number of variations. The array of switches operate on a transistorised security circuit with IC logic. The system sets the alarm and is activated by operating any other switches e.g. opening the doors. ADVANTAGE - Simple security system, difficult to bypass.