| 摘要 |
<p>A fuel cut-off anti-theft device for a vehicle comprises a fuel control valve 1 for mounting in a vehicle fuel line 2. Control means for operating the valve 1 comprises a local control device 10 formed by an electronic circuit 15 mounted to the valve body and a remote keypad 12 through which the user inputs a coded sequence of input signals to operate the valve 1. The electronic circuit 15 and the body of the valve are encapsulated with an epoxy resin compound to prevent tampering with the valve body and/or circuit 15. The circuit 15 comprises an integrated sequence detector 16, a voltage regulator 19 and associated noise filtering capacitors C2 and C3. The valve 1 is operated by a relay 20 which is activated by the sequence detector 16 through a transistor Q1 when the correct input signals are entered using the keypad 12.</p> |
