Method of an apparatus for sensing the unauthorized movement of vehicles and the like and generating an alarm or warning of vehicle theft
View Patent ↗An improved motion sensing and alarm technique and apparatus for monitoring unauthorized movement of vehicles or the like and notifying the owner thereof, wherein the motion sensors in the vehicle are microprocessor controlled to be automatically armed when the owner is not in the vicinity of the vehicle, but disarmed or de-activated in the presence of the owner and the owner's radio-coded identification transmitter associated with the owner's key fob, and with energy saving features as well.
1. A method of unauthorized vehicle motion sensing and alarm with the aid of in vehicle acceleration sensors, that comprises,
monitoring the presence or absence of predetermined periodic radio-frequency pulse transmissions from an authorized source in the vicinity of the vehicle;
in the event that such transmissions are present, receiving the transmissions in the vehicle; and
disarming or de-activating the acceleration sensors;
in the absence of such reception, arming or activating the acceleration sensors in the vehicle to test for any acceleration of the vehicle by unauthorized motion thereof over predetermined time period samples;
in the event such vehicle acceleration is detected by the accelerator sensors, sending a wireless alarm message for so informing the vehicle owner;
after a further predetermined longer period of time during said activating of the acceleration sensors wherein no motion of the vehicle has been detected, disarming or deactivating the acceleration sensors to put them in a sleep mode and conserve activation energy;
upon the advent of vibration detection at the vehicle during such sleep mode, awakening and re-arming or re-activating the acceleration sensors;
and again disarming or de-activating the acceleration sensors upon the later advent of the reception of said transmissions in the vehicle.
2. The method of claim 1 wherein the acceleration sensors sense all directions of motion of the vehicle.
3. The method of claim 2 wherein orthogonal-axis accelerator sensors are mounted in the vehicle.
4. The method of claim 1 wherein the radio-frequency pulse transmissions are coded for predetermined authorized users and such are validated as received in the vehicle.
5. The method of claim 1 wherein, in the absence of receipt of said radio-frequency pulse transmissions, the acceleration sensors are monitored by sampling their outputs at about a 100 millisecond period rate.
6. The method of claim 5 wherein if motion is detected over about a one second interval or so, for more than half the timing of the millisecond samples, said alarm message is sent.
7. The method of claim 5 wherein said longer predetermined period of time is of the order of about 10 minutes or so.
8. The method of claim 7 wherein after the elapse of still a longer period of time of the order of hours, the vehicle motion sensing and alarm system become dormant, only to automatically reactivate itself upon receipt of said radio-frequency pulse transmissions.
9. The method of claim 1 wherein a test mode is provided in which a request signal is sent for validating to host devices that the acceleration sensors are functioning.
10. The method of claim 1 wherein a learn mode is provided in which each unique code of different users is learned and visually indicated.
11. Apparatus for unauthorized vehicle motion sensing and alarm having, in combination, a vehicle-carried radio receiver for monitoring the presence or absence of predetermined periodic radio-frequency pulse transmissions from an authorized source in the vicinity of the vehicle;
microprocessor-controlled vehicle acceleration sensors carried by the vehicle and responsive in the absence of reception of said transmissions by the receiver, for reception of said transmissions by the receiver, for arming or activating the acceleration sensors in the vehicle to test for any acceleration of the vehicle by unauthorized motion thereof over predetermined time period samples;
in the event such vehicle acceleration is detected by the accelerator sensors, means for sending a wireless alarm message for so informing the vehicle owner;
the microprocessor, after a further predetermined longer period of time during said activating of the acceleration sensors wherein no motion of the vehicle has been detected, controlling the disarming or deactivating of the acceleration sensors to put them in a sleep mode and conserve activation energy, and further operable, upon the advent of vibration detection at the vehicle during such sleep mode, for awakening and re-arming or re-activating the acceleration sensors; and means controlled by the microprocessor for again disarming or de-activating the acceleration sensors upon the later advent of the reception of said transmissions in the vehicle by said receiver.
12. The apparatus of claim 11 wherein the acceleration sensors sense all directions of motion of the vehicle.
13. The apparatus of claim 12 wherein orthogonal-axis accelerator sensors are mounted in the vehicle.
14. The apparatus of claim 11 wherein the radio-frequency pulse transmissions are provided by a user-carried transmitter, as on a key fob, and such are coded for predetermined authorized users, with the receiver validating such in the vehicle.
15. The apparatus of claim 11 wherein, in the absence of receipt of said radio-frequency pulses transmissions, means is provided for monitoring the acceleration sensors by sampling their outputs at about a 100 millisecond period rate.
16. The apparatus of claim 15 wherein if motion is detected over about a one second interval or so, for more than half the timing of the 100 millisecond samples, said alarm message is sent.
17. The apparatus of claim 15 wherein said longer predetermined period of time is of the order of about 10 minutes or so.
18. The apparatus of claim 17 wherein after the elapse of still a longer period of time of the order of hours, the vehicle motion sensing and alarm system become dormant, only automatically to reactivate itself upon receipt of said radio-frequency pulse transmissions.
19. The apparatus of claim 11 wherein a test mode is provided in which a request signal is sent for validating to a host device that the motion sensors are functioning.
20. The apparatus of claim 11 wherein a learn mode is provided in which each unique code of different users is learned and visually indicated.
21. The apparatus of claim 15 wherein means is provided for a safety delay to accommodate interference or other blocking of the transmitted pulses.