System and method for utilizing traffic signal information for improving fuel economy and reducing trip time

• US 8,478,500 B1
• Filed: 08/31/2010
• Issued: 07/02/2013
• Est. Priority Date: 09/01/2009
• Status: Active Grant

• Current Assignee: Clemson University
• Original Assignee: Clemson University
• Inventors: Vahidi, Ardalan, Mahler, Grant David
• Primary Examiner(s): CICCHINO, PATRICK D
• Application Number:
  US12/872,567
• Time in Patent Office: 1,036 Days
• Field of Search: 701/93, 701/408, 340/936, 340/937, 340903-905, 340/916
• US Class Current: 701/93
• CPC Class Codes: B60T 17/22 Devices for monitoring or checking brake systems; Signal devices
• CPC Class Codes: B60T 7/18 operated by wayside apparatus
• CPC Class Codes: G08G 1/0112 from the vehicle, e.g. floating car data [FCD]
• CPC Class Codes: G08G 1/0145 for active traffic flow control
• CPC Class Codes: G08G 1/096716 where the received information does not generate an automatic action on the vehicle control
• CPC Class Codes: G08G 1/096725 where the received information generates an automatic action on the vehicle control
• CPC Class Codes: G08G 1/096741 where the source of the transmitted information selects which information to transmit to each vehicle
• CPC Class Codes: G08G 1/096775 where the origin of the information is a central station
• CPC Class Codes: G08G 1/096783 where the origin of the information is a roadside individual element

Abstract

A system and method for utilizing traffic signal information to reduce wait time at traffic signals and to reduce fuel use is disclosed. Traffic signal timing data can be received from traffic signals or from a central server to determine a reference velocity for a vehicle to travel through a plurality of traffic signals. The reference velocity can then be provided to the driver so that the driver can manually control the vehicle at a velocity close to the reference velocity. The techniques of the present disclosure also can be used in connection with a cruise control system to control the velocity of a vehicle to be close to the reference velocity.

Claims

1. A method for determining a velocity for a vehicle traveling through a plurality of traffic signals, the method comprising:

receiving first traffic signal data associated with a first traffic signal;

receiving second traffic signal data associated with a second traffic signal;

receiving position information associated with the vehicle, the position information comprising current location information for the vehicle; and

determining a reference velocity for traveling through the first and second traffic signal without having to stop at a red signal;

wherein the reference velocity is determined based at least in part on the first traffic signal data and the second traffic signal data.

2. The method of claim 1, wherein determining the reference velocity comprises:

determining a first range of velocities for traveling through the first traffic signal without having to stop at a red signal, the first range of velocities being determined based at least in part on the first traffic signal data and the position information;

determining a second range of velocities for traveling through the second traffic signal without having to stop at a red signal, the second range of velocities being determined based at least in part on the second traffic signal data and the CFP-S position information;

comparing the first range of velocities with the second range of velocities to determine a first set intersection between the first range of velocities and the second range of velocities, the first set intersection comprising a range of potential reference velocities for traveling through the first traffic signal and the second traffic signal without having to stop at a red signal; and

selecting the reference velocity from the first set intersection.

3. The method of claim 2, wherein selecting the reference velocity from the first set intersection comprises selecting the reference velocity equal to the highest velocity in the first set intersection.

4. The method of claim 1, wherein the reference velocity is determined based at least in part taking into account speed limit constraints.

5. The method of claim 1, wherein the method comprises:

receiving updated position information associated with the vehicle;

updating the reference velocity based on the updated position information.

6. The method of claim 1, wherein the method further comprises:

determining at least one control input for a cruise control system for maintaining vehicle velocity at a controlled vehicle velocity that is substantially equal to the reference velocity;

wherein the at least one control input is determined based at least in part on speed limit constraints, braking force constraints, engine force constraints, or a minimum distance between the vehicle and a vehicle traveling in front of the vehicle.

7. The method of claim 1, wherein the first traffic signal data is received from the first traffic signal and the second traffic signal data is received from the second traffic signal.

8. The method of claim 1, wherein the first and second traffic signal data is received from a central server.

9. The method of claim 1, wherein the method further comprises:

receiving traffic signal data associated with one or more additional traffic signals;

determining a range of velocities to pass through each of the one or more additional traffic signals without having to stop at a red signal, the range of velocities being determined based at least in part on the traffic signal data associated with the one or more additional traffic signals; and

comparing the first set intersection with the range of velocities to determine a second set intersection between the first set intersection and the range of velocities, the second set intersection comprising a range of potential reference velocities for traveling through the first traffic signal, the second traffic signal, and the one or more additional traffic signals without having to stop at a red signal.

10. A system for determining a reference velocity for a vehicle traveling through a plurality of traffic signals, comprising:

a remote device associated with the vehicle;

a central server in communication with the remote device, the central server having a database configured to store first traffic signal data associated with a first traffic signal and second traffic signal data associated with a second traffic signal, the central server configured to receive position information associated with the vehicle from the remote device, the position information comprising location information for the vehicle;

a processor associated with the central server, the processor configured to execute computer readable instructions stored on a computer readable medium to determine a reference velocity for traveling through the first and second traffic signal without having to stop at a red signal;

wherein the reference velocity is determined based at least in part on the first traffic signal data and the second traffic signal data.

11. The system of claim 10, wherein the processor is configured to execute computer readable instructions stored on a computer readable medium to:

determine a first range of velocities for traveling through the first traffic signal without having to stop at a red signal, the first range of velocities being determined based at least in part on the first traffic signal data and the position information;

determine a second range of velocities for traveling through the second traffic signal without having to stop at a red signal, the second range of velocities being determined based at least in part on the second traffic signal data and the position information;

compare the first range of velocities with the second range of velocities to determine a set intersection between the first range of velocities and the second range of velocities, the set intersection comprising a range of potential reference velocities for traveling through the first traffic signal and the second traffic signal; and

select the reference velocity from the set intersection.

12. The system of claim 10, wherein the central server is configured to communicate the reference velocity to the remote device.

13. The system of claim 10, wherein the remote device is coupled to a cruise control system, the cruise control system configured to control the velocity of the vehicle to be substantially equal to the reference velocity.

14. The system of claim 13, wherein the processor is configured to determine at least one control input for the cruise control system, the at least one control input being determined based at least in part on speed limit constraints, braking force constraints, engine force constraints, or a minimum distance between the vehicle and a vehicle traveling in front of the vehicle.

15. The system of claim 10, wherein the remote device is an electronic device comprising an application adapted to:

connect to the central server;

provide the position information to the central server; and

receive the reference velocity from the central server.

16. The system of claim 10, wherein the remote device is an electronic device comprising an application adapted to:

connect to the central server;

receive first traffic signal data associated with a first traffic signal from the central server;

receive second traffic signal data associated with a second traffic signal from the central server; and

determine a reference velocity for traveling through the first and second traffic signal without having to stop at a red signal, the reference velocity being determined based at least in part on the first traffic signal data and the second traffic signal data.

17. A system for determining a reference velocity for a vehicle traveling through a plurality of traffic signals, the system comprising:

a communication device operable to receive first traffic signal data associated with a first traffic signal and second traffic signal data associated with a second traffic signal;

a GPS module adapted to determine the location of the vehicle;

a processor configured to receive the first and second traffic signal data from said receiver and to receive position information from said GPS module, the position information comprising the location information for the vehicle;

wherein said processor is configured to execute computer readable instructions stored on a computer readable medium to determine a reference velocity for traveling through the first and second traffic signal without having to stop at a red signal, the reference velocity being determined based at least in part on the first traffic signal data and the second traffic signal data.

18. The system of claim 17, wherein the communication device is configured to receive first traffic signal data from the first traffic signal and second traffic signal data from the second traffic signal.

19. The system of claim 17, wherein the communication device is configured to receive first traffic signal data and second traffic signal data from a central server.

20. The system of claim 17, wherein the system is coupled to a cruise control system, the processor is configured to determine at least one control input for the cruise control system, the at least one control input being based at least in part on speed limit constraints, braking force constraints, engine force constraints, or minimum distance between the vehicle and a vehicle traveling in front of the vehicle.