Automotive burglar alarm that recycles after its initial alarm production
First Claim
1. A burglar alarm for an automotive vehicle having an electrical system including a battery, battery cables, at least one electrical device for drawing current from the battery, and a switch for controlling current flow from the battery to said device, said burglar alarm comprising:
- input means for sensing an amount of current drawn from and charged to said battery and producing a signal indicative thereof;
arming means, responsive to said signal, for automatically arming said burglar alarm only when said current changes to less than a predetermined amount;
alarm means for producing an alarm indication when said burglar alarm is armed and more than a predetermined current is drawn from said battery, and for maintaining said alarm indication; and
means for resetting said burglar alarm a predetermined time after said indication, and for causing said alarm indication to recur if more than said predetermined current continues to be drawn from said battery.
3 Assignments
0 Petitions
Accused Products
Abstract
An alarm system for an automotive vehicle including direct coupled input connections which provide a voltage proportional to the amount of current interchanged between, the battery and the electrical system of the vehicle. An arming circuit is responsive to the voltage and arms the burglar alarm only when less than a predetermined current is interchanged between the battery and the electrical system. An alarm circuit produces an alarm when the alarm system is armed and more than a predetermined amount of current is drawn from the battery.
17 Citations
12 Claims
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1. A burglar alarm for an automotive vehicle having an electrical system including a battery, battery cables, at least one electrical device for drawing current from the battery, and a switch for controlling current flow from the battery to said device, said burglar alarm comprising:
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input means for sensing an amount of current drawn from and charged to said battery and producing a signal indicative thereof; arming means, responsive to said signal, for automatically arming said burglar alarm only when said current changes to less than a predetermined amount; alarm means for producing an alarm indication when said burglar alarm is armed and more than a predetermined current is drawn from said battery, and for maintaining said alarm indication; and means for resetting said burglar alarm a predetermined time after said indication, and for causing said alarm indication to recur if more than said predetermined current continues to be drawn from said battery. - View Dependent Claims (2, 3, 4, 5)
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6. A burglar alarm for an automotive vehicle having an electrical system including a battery, battery cables, at least one electrical device for drawing current from the battery, and a switch for controlling current flow from the battery to said device, said burglar alarm comprising:
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input means for sensing an amount of current drawn from said battery by said at least one device and producing a signal indicative thereof; arming means responsive to said signal for automatically arming said burglar alarm only when less than a predetermined current is drawn from said battery; alarm means for producing an alarm indication for a predetermined time when said alarm is armed and more than a predetermined amount of current is drawn from said battery; and means for ending said alarm indication after said predetermined time and allowing said alarm indication to recur if said alarm means still receives more than a predetermined current drawn from said battery. - View Dependent Claims (7, 8, 9)
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10. A burglar alarm for an automotive vehicle having an electrical system including a battery, battery cables, at least one electrical device for drawing current from the battery, a switch for controlling current flow from the battery to said device;
- and a charging means for supplying charging current to the battery, said burglar alarm comprising;
input means for sensing an amount of current provided to said battery by said charging means and providing a signal indicative thereof; arming means for arming said burglar alarm responsive to an arming stimulus; alarm means for producing an alarm indication for a predetermined time when said alarm is armed and more than a predetermined amount of current is drawn from said battery; a disarming means responsive to said signal for automatically disarming said alarm, and resetting said arming means thereby ending said alarm indication when more than a predetermined current is charged to said battery; and means for resetting said burglar alarm a predetermined time after said indication, so that said burglar alarm remains armed after said predetermined time only if said current is less than said predetermined amount, and said alarm indication continues to be produced if more than a predetermined current continues to be drawn from said battery. - View Dependent Claims (11)
- and a charging means for supplying charging current to the battery, said burglar alarm comprising;
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12. A method of operating a burglar alarm for an automotive vehicle, comprising the steps of:
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sensing an amount of current provided to a battery of the vehicle; automatically arming said burglar alarm only when said current changes from more than a predetermined amount to less than said predetermined amount; producing an alarm indication when said burglar alarm is armed and more than a predetermined current is drawn from said battery; resetting said arming means at a time during said alarm indication; and said alarm indication recurring after a predetermined time if said burglar alarm is armed and more than a predetermined current continues to be drawn from said battery, and producing another alarm indication when said burglar alarm is armed and more than a predetermined current is again drawn from said battery.
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Specification