System and synchronization process for inductive loops in a multilane environment

• US 7,324,015 B1
• Filed: 05/27/2005
• Issued: 01/29/2008
• Est. Priority Date: 10/17/2001
• Status: Expired due to Term

• Current Assignee: Transcore LP (Roper Technologies, Inc.)
• Original Assignee: Jim Allen
• Inventors: Banna, Balaraju, Allen, Jim, Allen, David C. Sr., Talley, Malcolm, Jacobs, Allen
• Primary Examiner(s): MULLEN, THOMAS J
• Application Number:
  US11/138,542
• Time in Patent Office: 977 Days
• Field of Search: 340/933, 340/941, 705/13
• US Class Current: 340/933
• CPC Class Codes: G07B 15/063 using wireless information transmission between the vehicle and a fixed station identification of vehicles G08G
• CPC Class Codes: G08G 1/01 Detecting movement of traffic to be counted or controlled G08G1/07 - G08G1/14 take precedence
• CPC Class Codes: G08G 1/0175 by photographing vehicles, e.g. when violating traffic rules
• CPC Class Codes: G08G 1/042 using inductive or magnetic detectors

Abstract

A method and system for synchronization of detection loops in a multilane environment. A plurality of loop sensors are arranged in a plurality of lanes such that loop sensors in adjacent lanes are mutually contiguous. A simultaneous synchronization signal is sent to each of the plurality of loop detector controllers, where each loop detector controller is in communication with a loop sensor. The signal causes a scheduling of sampling periods for each loop sensor, such that the sampling period of each loop sensor does not overlap with that of a contiguous loop in an adjacent lane.

Claims

1. A system for managing a multi-lane road, comprising:

a plurality of vehicle detection sensors arranged on two or more lanes of the road so that each of the two or more lanes of the road contains at least one of the plurality of vehicle detection sensors, the vehicle detection sensors further arranged so that sensors in adjacent lanes are mutually adjacent to each other;

a plurality of loop detector controllers each associated with one of the two or more lanes of the road, wherein each of the plurality of loop detector controllers is in communication with one or more vehicle detection sensors that are in the lane associated with a respective loop detector controller;

a communications channel connected to the plurality of loop detector controllers; and

a communications master program operable over the communications channel for sending a synchronization signal to the plurality of loop detector controllers, wherein a sampling period of each vehicle detection sensor does not overlap with that of a contiguous vehicle detection sensor in an adjacent lane,

wherein the synchronization signal is sent to each loop detector controller on a predetermined time schedule, and

wherein the predetermined time schedule corresponds to one of a single instance at the start up of all the lanes and a regular interval that is between about 1 second and about 60 seconds.

2. The system of claim 1, wherein one or more of the vehicle detection sensors are inductive loop sensors.

3. The system of claim 1, wherein the communications channel is associated with one of an Ethernet network and a dedicated communications channel.

4. The system of claim 1, wherein the communications master program is a program configured to provide a control page that displays a schematic layout of a position and a sampling period status of each of the plurality of vehicle detection sensors, wherein the sampling period status is one of a primary sampling period and a secondary sampling period.

5. The system of claim 4, wherein the schematic layout comprises an X-Y grid, and wherein sensor primary and secondary sampling period status comprises a substantially checkerboard pattern.

6. The system of claim 5, wherein each position on the checkerboard pattern oscillates from primary to secondary sampling period according to a predetermined sensor sampling period.

7. A method for intelligent vehicle identification, comprising:

arranging a plurality of vehicle detection sensors in a plurality of lanes of a road such that vehicle detection sensors in adjacent lanes are mutually adjacent;

sending a synchronization signal to two or more loop detector controllers, wherein each loop detector controller is in communication with one or more of the vehicle detection sensors, wherein the synchronization signal is sent at a regular interval of between about 1 second and about 60 seconds;

scheduling a sampling period for each vehicle detection sensor, wherein the sampling period of each vehicle detection sensor does not overlap with that of a mutually adjacent vehicle detection sensor in an adjacent lane.

8. The method of claim 7, wherein one or more of the vehicle detection sensors are inductive loop sensors.

9. The method of claim 7, wherein the synchronization signal is sent over one of an Ethernet connection or a dedicated channel.

10. The method of claim 7, wherein the synchronization signal is sent once during start up of all the plurality of lanes.

11. A system for managing a multi-lane toll road, comprising:

a first vehicle detection sensor arranged on a first lane of the toll road, the first vehicle detection sensor in communication with a first loop detector controller;

a second vehicle detection sensor arranged on a second lane of the toll road, the second vehicle detection sensor is in communication with a second loop detector controller, wherein the second vehicle detection sensor is mutually adjacent to the first vehicle detection sensor;

a communications channel connected to the first loop detector controller and the second loop detector controller; and

a communications master program operable over the communications channel for sending a synchronization signal to the first loop detector controller and the second loop detector controller, wherein a sampling period of the first vehicle detection sensor does not overlap with the second vehicle detection sensor, wherein the synchronization signal is sent to each vehicle detection sensor on a predetermined time schedule, wherein the predetermined time schedule corresponds to one of a single instance at the start up of all the lanes and a regular interval that is between about 1 second and about 60 seconds.

12. The system of claim 11, wherein the vehicle detection sensor comprises at least one inductive loop sensor.

13. The system of claim 11, wherein the communications channel is associated with one of an Ethernet network and a dedicated communications channel.

14. A method for intelligent vehicle identification on a toll road, comprising:

arranging a first vehicle detection sensor in a first lane of the toll road;

arranging one or more additional vehicle detection sensors in one or more additional lanes of the toll road;

sending a synchronization signal to each of the vehicle detection sensors, wherein the synchronization signal is sent at a regular interval of between about 1 second and about 60 seconds; and

scheduling a sampling period for each vehicle detection sensor, wherein the sampling period of each detection sensor residing in each respective lane, does not overlap with that of a sensor in an adjacent lane to the respective lane.

15. The method of claim 14, wherein one or more of the vehicle detection sensors are inductive loop sensors.

16. The method of claim 14, wherein all of the vehicle detection sensors are inductive loop sensors.

17. The method of claim 14, wherein the synchronization signal is sent once during start up of the intelligent vehicle identification system.

18. The method of claim 14, wherein the synchronization signal is based on a phase of a common power supply that provides power to each of the vehicle detection sensors.