Theft warning system
First Claim
Patent Images
1. A theft warning system for use in a vehicle having a plurality of doors with door lock devices, comprising:
- first means for detecting whether an ignition switch of the vehicle is open or closed and generating a signal according to the condition of the ignition switch;
second means for detecting whether each of said vehicle doors is open or closed and generating a signal according to the condition of each said door;
third means for detecting whether said door lock device of at least one of said doors is locked or unlocked, and generating a signal according to the condition of said door lock device;
fourth means for detecting whenever one of said door lock device is unlocked by actuation of a door key, and generating a signal indicating that one of said door lock devices has been so unlocked;
control means for receiving the signals generated by the first, second, third and fourth means, said control means setting a theft detecting condition when a last of said doors is closed by an operator outside of the vehicle while the ignition switch is open and all of said door lock devices are locked, and for generating a theft warning signal when, after setting of said theft detecting condition, one of said vehicle doors is opened or unlocked without use of a door key; and
alarm means responsive to said theft warning signal for generating an alarm signal.
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Abstract
A theft warning system for use in a vehicle, which issues a warning to protect vehicle contents when a vehicle door is opened without use of a door key. The theft warning condition is set only when all doors are closed while all the door lock devices are locked. The theft warning system generates a theft warning signal when the final open door is closed and locked without use of a door key and one of the door lock devices subsequently is unlocked without a door key.
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Citations
11 Claims
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1. A theft warning system for use in a vehicle having a plurality of doors with door lock devices, comprising:
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first means for detecting whether an ignition switch of the vehicle is open or closed and generating a signal according to the condition of the ignition switch; second means for detecting whether each of said vehicle doors is open or closed and generating a signal according to the condition of each said door; third means for detecting whether said door lock device of at least one of said doors is locked or unlocked, and generating a signal according to the condition of said door lock device; fourth means for detecting whenever one of said door lock device is unlocked by actuation of a door key, and generating a signal indicating that one of said door lock devices has been so unlocked; control means for receiving the signals generated by the first, second, third and fourth means, said control means setting a theft detecting condition when a last of said doors is closed by an operator outside of the vehicle while the ignition switch is open and all of said door lock devices are locked, and for generating a theft warning signal when, after setting of said theft detecting condition, one of said vehicle doors is opened or unlocked without use of a door key; and alarm means responsive to said theft warning signal for generating an alarm signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A theft warning system for use in a vehicle having a plurality of doors with door lock devices, comprising:
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an ignition switch having an open and a closed position and generating a signal indicating whether it is open or closed; a plurality of door switches, one for each of said doors, each said switch generating a signal indicating when its respective door is open; at least one detector for generating a signal when at least one of said door lock devices is unlocked; a plurality of key unlock detectors, one for each of said door lock devices, each said door unlock detector generating a signal when its respective door lock device is unlocked by use of a door key; a programmed microprocessor receiving the signals generated by said door switches, said detectors, said door unlock detectors and said ignition switch, for setting a theft detecting condition when a last of said doors is closed by an operator outside of said vehicle while all of said door lock devices are maintained in a locked condition, and for generating a theft warning signal when a door is subsequently opened or unlocked without use of a door key; and means for sounding a horn of said vehicle and flashing headlights and taillights of said vehicle responsive to said theft warning signal.
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Specification