Engine speed responsive anti-theft device for vehicle
First Claim
1. An anti-theft device for a vehicle driven by an internal combustion engine having an ignition system including a plurality of igniters, a transformer having a secondary selectively connected to said igniters for energizing the same, and switching means driven by said engine for periodically interrupting the current flowing through the primary of said transformer, said device comprising:
- disabling means for connection to an internal combustion engine for disabling the engine,speed responsive means responsive to the speed of the engine and comprising an electronic speed sensing means adapted to be connected across such a switching means and generate a voltage dependent upon the speed with which said switching means is actuated and means responsive to said voltage connected to said disabling means and effective when said voltage exceeds a value indicative of the predetermined value of engine speed to actuate said disabling means regardless of the speed of the vehicle,manually operable means for rendering said disabling means ineffective when the vehicle is to be driven by an authorized driver,and means for maintaining said disabling means effective after actuation thereof until said manually operable means is operated, regardless of the time intervening until said manually operable means is operated.
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Accused Products
Abstract
An anti-theft device for an automotive vehicle in which an electronic engine speed responsive means is effective, when said anti-theft device has been prepared for operation by closure of a concealed switch, to disable the engine after the engine reaches a predetermined speed and to maintain the engine disabled until the concealed switch is reopened. The device may also energize the horn relay so that the horn sounds while the engine is disabled. The electronic speed responsive device can be connected across the points and the circuit components all can operate at vehicle battery voltages so that the anti-theft device can be quickly installed in a vehicle. The engine disabling means can be maintained in operation either through the use of an electronic trigger switch or by the use of a relay which establishes its own holding circuit.
16 Citations
8 Claims
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1. An anti-theft device for a vehicle driven by an internal combustion engine having an ignition system including a plurality of igniters, a transformer having a secondary selectively connected to said igniters for energizing the same, and switching means driven by said engine for periodically interrupting the current flowing through the primary of said transformer, said device comprising:
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disabling means for connection to an internal combustion engine for disabling the engine, speed responsive means responsive to the speed of the engine and comprising an electronic speed sensing means adapted to be connected across such a switching means and generate a voltage dependent upon the speed with which said switching means is actuated and means responsive to said voltage connected to said disabling means and effective when said voltage exceeds a value indicative of the predetermined value of engine speed to actuate said disabling means regardless of the speed of the vehicle, manually operable means for rendering said disabling means ineffective when the vehicle is to be driven by an authorized driver, and means for maintaining said disabling means effective after actuation thereof until said manually operable means is operated, regardless of the time intervening until said manually operable means is operated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification