초록 ▼

A vehicle antitheft system includes a MOSFET (418) with associated power and logic circuitry that can be housed within a starter solenoid housing (704) for preventing control current from activating the solenoid unless an authorized enable signal is received. The enable signal can be transmitted by

A vehicle antitheft system includes a MOSFET (418) with associated power and logic circuitry that can be housed within a starter solenoid housing (704) for preventing control current from activating the solenoid unless an authorized enable signal is received. The enable signal can be transmitted by a hand-held rf transmitter. In alternate embodiments, the MOSFET can be disposed in a housing separate from the solenoid and mounted near the solenoid, and the MOSFET can be controlled by an rf-generated enable signal or by an impulse-generated enable signal. In the latter case, the MOSFET is activated to close the solenoid control current circuit path only when a single impulse signal, e.g., from a door latch lock, is activated. If two impulse signals are received, one from, e.g., the door latch lock and another from, e.g., a locking mechanism/switch inside the vehicle, the MOSFET is not activated, to prevent a thief from actuating the system by breaking into the vehicle and unlocking the vehicle door from inside the vehicle.

대표청구항 ▼

[ What is claimed is:] [1.]1. An antitheft system for a starter solenoid of a vehicle, the starter solenoid having a solenoid housing and an activating coil in the housing, the system comprising:a system housing positionable adjacent the solenoid housing;at least one power switch connectable in elec

[ What is claimed is:] [1.]1. An antitheft system for a starter solenoid of a vehicle, the starter solenoid having a solenoid housing and an activating coil in the housing, the system comprising:a system housing positionable adjacent the solenoid housing;at least one power switch connectable in electrical series with a terminal of the activating coil for actuating the solenoid upon receipt of an enable signal;a voltage regulation circuit establishing a predetermined voltage to the power switch; anda first electrical port for receiving a first impulse signal from a first vehicle component and a second electrical port for receiving a second impulse signal from a second vehicle component, the enable signal being established only when the first impulse signal is received, the enable signal not being established when no impulse signals are received or when the first and second impulse signals are received.