Adaptive traffic control
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| Title: | Adaptive traffic control |
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| Patent Number: | 11348,458 |
| Publication Date: | May 31, 2022 |
| Appl. No: | 16/615104 |
| Application Filed: | June 08, 2018 |
| Abstract: | The disclosure presents methods and apparatus for adaptive control of one or more traffic signals. A method may include determining an offset value based on a function of a traffic flow performance metric. The method may further include determining a green time split value based on a distributed algorithm. The method may further include adaptive control of the one or more traffic signals based on the green time split value and the offset value. |
| Inventors: | UNIVERSITY OF SOUTHERN CALIFORNIA (Los Angeles, CA, US) |
| Assignees: | UNIVERSITY OF SOUTHERN CALIFORNIA (Los Angeles, CA, US) |
| Claim: | 1. A traffic signal controller for adaptive control of one or more traffic signals, the traffic signal controller comprising: a memory; and one or more processors operatively coupled to the memory and configured to: determine an offset value based on a traffic flow performance metric; determine green time split value based on a distributed algorithm; control the one or more traffic signals based on the green time split value and the offset value; obtain measurement data indicating the traffic flow performance metric; and update at least one of the green time split value or the offset value, based on the measurement data. |
| Claim: | 2. The traffic signal controller of claim 1 , wherein the one or more processors are configured to exchange determined offset values and green time split values with the one or more additional traffic signal controllers. |
| Claim: | 3. The traffic signal controller of claim 1 , further comprising a transceiver configured to communicate with one or more other traffic signal controllers located diagonal from the traffic signal controller. |
| Claim: | 4. The traffic signal controller of claim 1 , wherein obtaining the measurement data comprises receiving data using a Dedicated Short Range Communication (DSRC) receiver. |
| Claim: | 5. The traffic signal controller of claim 1 , wherein the traffic signal controller controls more than one traffic signal. |
| Claim: | 6. The traffic signal controller of claim 1 , wherein the traffic signal controller controls a network of traffic signals. |
| Claim: | 7. A method for adaptive control of one or more traffic signals comprising: determining an offset value based on a first traffic flow performance metric; determining a green time split value based on at least one of the first traffic flow performance metric or a second traffic flow performance metric; controlling the one or more traffic signals based on the green time split value and the offset value; obtaining measurement data indicating at least one of first traffic flow performance metric or the second traffic flow performance metric; and updating at least one of the first traffic flow performance metric or the second traffic flow performance metric, based on the measurement data. |
| Claim: | 8. The method of claim 7 , further comprising calculating the green time split value based on a proportionally fair algorithm, and the offset value based on traffic queue length. |
| Claim: | 9. The method of claim 7 , further comprising associating an offset value with an intersection and a traffic signal wherein the offset value is based on a degree of spill back for the associated intersection and traffic signal. |
| Claim: | 10. The method of claim 7 , further comprising determining a cycle time based on the green time split value for the one or more traffic signals. |
| Claim: | 11. The method of claim 7 , wherein determining the green time split value and offset value are based on an instantaneous measurement of the first traffic flow performance metric. |
| Claim: | 12. The method of claim 7 , further comprising optimizing traffic flow efficiency using one or more gradients of a cost function. |
| Claim: | 13. The method of claim 7 , wherein determining the green time split value occurs before determining the offset value. |
| Claim: | 14. The method of claim 7 , wherein the first traffic flow performance metric comprises a distributed algorithm. |
| Claim: | 15. The method of claim 7 , further comprising changing the green time split value whenever the offset value is transitioned from one value to another. |
| Claim: | 16. The method of claim 7 , further comprising calculating an optimum offset value based on the combination of free flow travel time and wave speed. |
| Claim: | 17. The method of claim 7 , further comprising corresponding a traffic signal controller with a traffic signal wherein the traffic signal controller is situated remotely with respect to its corresponding traffic signal. |
| Claim: | 18. The method of claim 7 , further comprising providing measurement data to upstream traffic signal controllers and their associated traffic signals and updating the green time split value and offset value of the traffic signal controllers. |
| Claim: | 19. A system for adaptive control of one or more traffic signals comprising: a first traffic signal controller operatively coupled to a first traffic signal; and a second traffic signal controller operatively coupled to a second traffic signal, the second traffic signal controller configured to communicate with the first signal traffic controller, the second traffic signal controller having one or more processors configured to: determine an offset value based on a traffic flow performance metric; determine a green time split value based on a distributed algorithm; control the one or more traffic signals based on the green time split value and the offset value; obtain measurement data indicating the traffic flow performance metric; and update at least one of the green time split value or the offset value, based on the measurement data. |
| Claim: | 20. The system of claim 19 , wherein the one or more processors are configured to obtain measurement data over a plurality of cycle times before updating the at least one of the green time split value or the offset value. |
| Patent References Cited: | 5357436 October 1994 Chiu 8103436 January 2012 Chandra et al. 2008/0094250 April 2008 Myr 2008/0238720 October 2008 Lee 2009/0322561 December 2009 Morioka et al. 2013/0099942 April 2013 Mantalvanos 2014/0159924 June 2014 Lee 2016/0267790 September 2016 Raamot 2017/0053529 February 2017 Yokoyama WO2015/159251 October 2015 |
| Other References: | International Search Report and Written Opinion of the International Searching Authority dated Aug. 30, 2018 for Corresponding International PCT Patent Application No. PCT/US18/036759, filed Jun. 8, 2018. cited by applicant |
| Primary Examiner: | La, Anh V |
| Attorney, Agent or Firm: | Snell & Wilmer LLP |
| Accession Number: | edspgr.11348458 |
| Database: | USPTO Patent Grants |
| Abstract: | The disclosure presents methods and apparatus for adaptive control of one or more traffic signals. A method may include determining an offset value based on a function of a traffic flow performance metric. The method may further include determining a green time split value based on a distributed algorithm. The method may further include adaptive control of the one or more traffic signals based on the green time split value and the offset value. |
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