| 摘要 |
A surveillance system 10 combats theft of fuel from motor vehicles. The system 10 comprises a fuel cap sensor 12 operative to detect movement of the fuel cap, and a fuel tank sensor 14 operative to detect any attempt to penetrate the tank. The sensors are arranged to activate a local alarm 22 and a remote alarm 24 by way of a communications subsystem 20. A control subsystem 26 is operable, by means of a key fob operated by a driver of a vehicle, to switch the system 10 between a first (armed) state and a second (disarmed) state. In the first (armed) state, either of the alarms 22,24 is activated if either of the sensors 12,14 detects unauthorised movement. In the second state, only remote alarm 22 is activated if either of the sensors 12,14 detects unauthorised movement. By this means, a driver of a vehicle cannot gain unauthorised access to fuel by disarming the system 10. The fuel cap sensor 12 may be a magnetic sensor. The fuel tank sensor 14 may be a vibration sensor arranged to detect cutting, piercing or spiking of the tank. |
