| 摘要 |
An improved anti-theft system for a motor vehicle, or the like, which effectively prevents any voltage from being built up across the ignition coil of the vehicle unless a control signal is applied to the system. This is achieved by including a silicon controlled rectifier, for example, in the circuit, the silicon controlled rectifier being fired whenever attempts are made to start the vehicle without the introduction of the control signal to the ignition circuit, the silicon controlled rectifier effectively short-circuiting the primary of the ignition coil as to prevent any build-up of ignition voltage across the secondary. An improved electronic lock circuit supplies the required control signal to the anti-theft system only when a series of switches are closed in a particular pre-selected sequence known only to the owner of the vehicle.
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