SENSOR NODES ACTING AS INDUCTIVE LOOPS FOR TRAFFIC SENSING

• US 20120026013A1
• Filed: 11/17/2010
• Published: 02/02/2012
• Est. Priority Date: 07/29/2010
• Status: Active Grant

• Current Assignee: Sensys Networks Inc. (Tagmaster AB)
• Original Assignee: Sensys Networks Inc. (Tagmaster AB)
• Inventors: Fuller, Brian Anthony, Volling, Michael T., Cox, Kenneth Brian
• Granted Patent: US 8,487,781 B2
• Time in Patent Office: Days
• US Class Current: 340/928
• CPC Class Codes: G08G 1/042 using inductive or magnetic detectors

Abstract

Sensor nodes are disclosed that act like inductive loops to detect the presence and/or movement of vehicles on at least one roadway. Processors are disclosed using at least one sensor node to communicate vehicle detection that is statistically compatible with the inductive loop response to the vehicles. Installation may configure at least one of the sensor nodes to implement the inductive loop compatibility. Sensor clusters of sensor nodes installed in a roadway may act as inductive loops. Computer readable memories, installation devices and/or servers may deliver a program system and/or a Finite State Machine (FSM) configuration to implement the compatibility and/or an installation package to install the program system and/or the FSM configuration.

Claims

1. An apparatus comprising

a processor configured to use at least one response of at least one sensor node positioned to detect a vehicle in a roadway to generate a vehicle detection for use by a traffic management system to provide a traffic flow estimate of said roadway,

with said vehicle detection statistically compatible with a vehicle detection of said vehicle by an inductive loop positioned near said sensor node.

2. The apparatus of claim 1, further comprising at least one of

said traffic management system configured to direct at least one traffic controller in response to said traffic flow estimate;

and

said sensor node configured to use at least one of a wireless transceiver and a magnetic sensor,

with said wireless transceiver configured to at least partly deliver said response of said detect of said vehicle to at least partly generate said vehicle detection, and

with said magnetic sensor configured to generate said response to said presence of said vehicle.

3. The apparatus of claim 2, wherein said wireless transceiver is compatible with a version of at least one wireless communications protocol;

and

wherein said magnetic sensor employs at least one of a Hall effect and a magneto-resistive effect, to generate said response to said presence of said vehicle.

4. The apparatus of claim 1, wherein said sensor node is configured to use a wireline interface compliant with a wireline communications protocol to at least partly generate said vehicle detection.

5. The apparatus of claim 1,

wherein said processor includes at least one instance of at least one of

a finite state machine,

a computer, and

a memory configured to be accessed by said computer, with said memory containing at least one of a program system and an installation package configured to instruct said computer to install said program system in at least one of said finite state machine and said computer.

6. At least one of a server, an installation device, and a computer readable memory, each configured to deliver at least one said program system and said installation package of claim 5 to said processor.

7. The apparatus of claim 5,

wherein said program system comprises at least one of the program steps of:

using said response to said presence of said vehicle by said sensor node to generate said vehicle detection compatible with said vehicle detection by said inductive loop; and

sending said vehicle detection to said traffic management system.

8. The apparatus of claim 1, comprising at least one of

an access point configured to wirelessly communicate with said sensor node to provide said processor communication with said sensor node to at least partly generate said vehicle detection;

a router configured to wireline communicate with at least one of said sensor node and said access point to provide said processor communication with said sensor node to at least partly generate said vehicle detection;

a traffic controller configured to communicate with said traffic management system to use a traffic signal plan based upon said traffic flow estimate; and

an adaptive control system configured to respond to said vehicle detection to at least partly generate at least one of said traffic flow estimate and said traffic signal plan.

9. The apparatus of claim 8, wherein said processor is included in at least one of said access point, said router, said traffic controller, said traffic management systems, said adaptive control system and at least one of said sensor nodes.

10. A sensor cluster configured to act in a statistically compatible fashion to an inductive loop in response to a vehicle passing near said sensor cluster, comprising:

a first sensor node configured to be approached first by said vehicle to generate a start time of vehicle detection by a first installation in a pavement; and

a second sensor node configured to be approached after said first sensor node to generate an end time of said vehicle detection by a second installation in said pavement,

with said start time of said vehicle detection and said end time of said vehicle detection are statistically compatible with said response by said inductive loop of said vehicle passing close.

11. The sensor cluster of claim 10, wherein said second sensor node is further configured to alter at least one of said start time and said end time to insure compatibility with said response by said inductive loop.

12. The sensor cluster of claim 10, wherein at least one of said sensor nodes uses at least one of

a wireless transceiver to at least partly provide said vehicle detection,

a wireline transceiver to at least partly provide said vehicle detection, and

a magnet sensor to respond to said vehicle to at least partly generate said vehicle detection.

13. A method, comprising the step of installing said first sensor node and said second sensor node to generate said sensor cluster of claim 10, comprising the steps:

installing said first sensor node in said pavement to generate said first installation configured to generate said start time of said vehicle detection; and

installing said second sensor node in said pavement to generate said second installation configured to generate said end time to said vehicle detection

14. The method of claim 13, wherein the step of installing said second sensor node further comprises altering at least one of said start time and said end time of said vehicle detection to improve statistical compatibility with said inductive loop.

15. The sensor cluster in said pavement as a product of the process of claim 13.