Systems and methods for locating and controlling powered vehicles

• US 7,944,368 B2
• Filed: 08/25/2006
• Issued: 05/17/2011
• Est. Priority Date: 08/25/2005
• Status: Active Grant

• Current Assignee: Gatekeeper Systems, Inc.
• Original Assignee: Gatekeeper Systems, Inc.
• Inventors: James, Jesse M., Hannah, Stephen E., Carter, Scott J.
• Primary Examiner(s): Mehmood; Jennifer
• Application Number:
  US11/510,518
• Publication Number:
  US 20070045019A1
• Time in Patent Office: 1,726 Days
• Field of Search: 340/686.6, 340/942, 340/943, 340/539.23, 340/679, 340/426.16, 340/436, 3405681-5688, 340/426.12, 340/426.11, 340/686.1, 342/146, 342/147, 180274-280, 180/271, 180/232
• US Class Current: 340/686.6
• CPC Class Codes: B60T 7/16 operated by remote control, i.e. initiating means not mounted on vehicle

Abstract

A system for controlling movement of a personal mobility vehicle near a restricted region is disclosed. In one embodiment, the system includes a detector that is configured to be disposed on the personal mobility vehicle and that is configured to receive an electromagnetic signal transmitted to the restricted region. The system also includes a control unit configured to communicate with the detector. The control unit is further configured to determine proximity of the detector to the restricted region using information related to the signal received by the detector. The control unit is also configured to provide a command to inhibit movement of the personal mobility vehicle in response to the determined proximity of the vehicle to the restricted region.

Claims

1. A system for inhibiting the ability of a motorized cart to exit a retail store environment via a restricted region, the system comprising:

a detector configured to receive spatially distinct first and second electromagnetic signals transmitted at least near the restricted region where cart movement is to be inhibited, the restricted region located within or adjacent a retail store environment, the detector disposed on a motorized cart that is movable on a plurality of driver-selectable paths near the restricted region located within or adjacent the retail store environment,

wherein the first signal is transmitted by a first tower and the second signal is transmitted by a second tower, the first and second towers being part of an Electronic Article Surveillance (EAS) system for preventing theft of merchandise that can be purchased from the retail store, the first and second towers being located adjacent the restricted region; and

a control unit disposed on the motorized cart and configured to communicate with the detector, determine a Received Signal Strength Indication (RSSI) value for each of the first and second electromagnetic signals received by the detector, and compare the RSSI values of the first and second electromagnetic signals to determine proximity and direction of travel of the detector relative to the restricted region,

wherein the control unit is further configured to provide a command to inhibit movement of the motorized cart to at least one of a motor and a brake system of the motorized cart, the command provided in response to the determined proximity and direction of travel of the detector to the restricted region.

2. The system of claim 1, wherein the motorized cart is a motorized shopping cart.

3. The system of claim 1, wherein the detector comprises a unidirectional receiver and an omni-directional receiver.

4. The system of claim 1, wherein the command to inhibit movement comprises at least one of a command to reduce a throttle value of the motor of the motorized cart, a command to cut power to the motor of the motorized cart, and a command to actuate the brake system on the motorized cart.

5. The system of claim 1, wherein the control unit is further configured to provide an audible or visual warning depending on the determined proximity of the detector to the restricted region.

6. The system of claim 5, wherein the control unit is configured to provide the warning before providing the command to inhibit movement of the motorized cart.

7. The system of claim 1, wherein the control unit is further configured to determine the speed of the detector in relation the restricted region, and wherein the command to inhibit movement of the motorized cart is further provided in response to the speed of the detector.

8. The system of claim 7, wherein the information related to the speed of the motorized cart comprises a throttle value.

9. The system of claim 1, further comprising an override system configured to change the command provided by the control unit.

10. The system of claim 9, wherein the override system comprises a manual override system or an override signal that is broadcast from a central control unit located in the retail store.

11. The system of claim 9, wherein the override system is configured to restore operability of the motor of the motorized cart.

12. The system of claim 9, wherein the override system is configured to permit the motorized cart to move through a portion of the restricted region if the detector receives a modified electromagnetic signal transmitted to the restricted region.

13. The system of claim 1, wherein the restricted region is fixed with respect to the retail store environment.

14. The system of claim 1, wherein the restricted region is located in or near a parking lot at the retail store environment.

15. The system of claim 1, wherein the control unit is further configured to provide the command to inhibit movement of the motorized cart if the received electromagnetic signal is at or above a threshold value.

16. The system of claim 1, wherein the restricted region includes a region within or adjacent the retail store environment where cart movement, if permitted, would create a safety hazard or make cart retrieval inconvenient.

17. The system of claim 1, wherein the command to inhibit movement of the motorized cart is provided in response the RSSI value of at least one of first and second electromagnetic signals being greater than a threshold value, thereby indicating a close proximity of the detector to at least one of the EAS towers.

18. The system of claim 3, wherein the control unit is further configured to determine the RSSI values for each of the first and second electromagnetic signals detected by the unidirectional and the omni-directional receivers, the control unit further configured to compare the RSSI values detected by the unidirectional receiver with the RSSI values detected by the omni-directional receiver to determine the heading of the cart.

19. A system for localizing and inhibiting a powered cart propelled by a motor from entering a restricted region located within or adjacent a facility, the system comprising:

a signal source configured to transmit a localization signal, the signal source further configured to be disposed on a powered cart propelled by a motor, the powered cart movable on a plurality of driver-selectable paths near the restricted region where movement of the powered cart is to be inhibited;

at least one detector comprising a first antenna, a second antenna, a phase shifter, a phase comparator, and a processor, wherein the detector is mounted on at least one structure located in or near the restricted region within or adjacent the facility and configured such that the first and second antennas receive the localization signal from the signal source disposed on the powered cart,

wherein the localization signal received by the first antenna is shifted by the phase shifter and outputs a shifted first antenna localization signal, wherein the phase comparator compares the shifted first antenna localization signal to the localization signal received by the second antenna, and wherein the processor determines a direction and proximity of the signal source relative to the at least one detector based at least in part on said comparison of the shifted first antenna localization signal to the localization signal received by the second antenna; and

a control unit configured to communicate with the at least one detector and to determine a localization of the signal source relative to the at least one detector,

wherein the control unit is further configured to use the localization of the signal source to determine whether to provide a command to control the motor on the powered cart,

wherein the command is to reduce the speed of the motor relative to the speed requested by a driver of the cart through a throttle, and

wherein the command is to not increase the speed of the motor or change the direction of travel of the cart.

20. The system of claim 19, wherein the powered cart is a motorized shopping cart.

21. The system of claim 19, wherein the localization signal comprises a radio frequency (RF) signal.

22. The system of claim 19, wherein the localization signal comprises an ultrasonic signal.

23. The system of claim 19, wherein the localization signal comprises an optical signal.

24. The system of claim 19, wherein the at least one detector comprises an angle-of-arrival detector.

25. The system of claim 19, wherein the at least one detector comprises two detectors mounted near the restricted region and defining a limit line, and the localization provides a position of the signal source relative to the limit line.

26. The system of claim 25, wherein the control unit is configured to determine whether the signal source has crossed the limit line.

27. The system of claim 19, wherein the detector further comprises an analog-to-digital converter configured to receive analog output from the phase comparator and provide digital output to the processor, and wherein the localization signal is preceded by a modulated transmission that indicates to the processor to instruct the analog-to-digital converter to digitize the output of the phase comparator.

28. The system of claim 19, wherein control unit is disposed on the cart and is configured such that if the communication with the at least one detector is interrupted the control unit uses the most current localization of the signal source relative to the at least one detector as a starting point for a dead reckoning navigation system to determine subsequent locations.

29. A processor-implemented method of inhibiting a powered cart propelled by a motor from entering a restricted region located within or adjacent a facility, the method comprising:

determining a location of the powered cart relative to a restricted region where movement of the powered cart is to be inhibited, the restricted region located within or adjacent a facility, the powered cart movable on a plurality of driver-selectable paths near the restricted region;

determining a direction of travel of the powered cart relative to the restricted region;

wherein the location and direction of travel of the powered cart relative to the restricted region are determined by a control unit configured to communicate with a detector, wherein the detector is configured to receive spatially distinct first and second electromagnetic signals from an Electronic Article Surveillance (EAS) system for preventing theft of merchandise that can be purchased from the retail facility, the EAS system comprising a first tower configured to transmit the first signal and a second tower configured to transmit the second signal, the first and second towers being located adjacent the restricted region;

wherein the control unit is configured to determine a Received Signal Strength Indication (RSSI) value for each of the first and second electromagnetic signals received by the detector, and to compare the RSSI values of the first and second electromagnetic signals to determine proximity and direction of travel of the detector relative to the restricted region;

making a decision, with a processor, whether to inhibit motion of the powered cart into the restricted region located within or adjacent the facility, wherein the processor is configured to use information related to at least one of the location and the direction of travel of the powered cart; and

automatically communicating an inhibition signal to at least one of the motor and a brake mechanism of the powered cart in response to the decision made with the processor.

30. The method of claim 29, wherein the control unit is further configured to determine a location of the powered cart relative to a limit line by detecting a radio frequency (RF) signal that indicates the limit line.

31. The method of claim 30, wherein the RF signal is transmitted by a very low frequency (VLF) line embedded adjacent the limit line near the restricted region.

32. The method of claim 30, wherein the RF signal is transmitted by a wireless access point.

33. The method of claim 30, wherein determining a direction of travel of the powered cart further comprises:

determining an orientation of the powered cart relative to the first limit line; and

determining whether the powered cart is operating in forward or reverse.

34. The method of claim 29, wherein the inhibition signal comprises a signal for reducing a throttle value of the motor of the powered cart.

35. The method of claim 29, wherein the motor of the powered cart comprises an electric motor and the inhibition signal comprises a signal for reducing electrical power to the electric motor.

36. The method of claim 29, wherein the inhibition signal comprises a signal for actuating the brake mechanism.

37. The method of claim 36, wherein the brake mechanism is disposed within a wheel of the powered cart.

38. The method of claim 29, further comprising providing a warning, in response to said decision, indicating that the powered cart is approaching the restricted region.

39. The method of claim 29, further comprising enabling operability of the powered cart after inhibiting motion of the powered cart.

40. The system of claim 29, wherein the restricted region is fixed with respect to the facility.

41. The system of claim 29, wherein the powered cart comprises a powered shopping cart, and the facility comprises a retail store environment.

42. The system of claim 30, wherein the RF signal is transmitted by a transmitter disposed within or adjacent the facility.

43. The system of claim 30, wherein the limit line is defined to include positions where the received RF signal exceeds a threshold value.

44. The system of claim 29, wherein the processor is configured to make the decision whether to inhibit motion of the powered cart into the restricted region using information related to the location and the direction of travel of the powered cart.