Single cycle offset adjustment for traffic signal controllers using a threshold percentage of the cycle length
View Patent ↗Embodiments include a method for single cycle offset adjustment for a traffic signal includes receiving a current signal control plan and a new signal control plan. The method also includes calculating an offset between the current signal control plan and a new signal control plan and determining if the offset is less than a threshold percentage of a cycle length of the new signal control plan. If the offset is less than a threshold percentage of the cycle length, the method includes reducing a time period of each phase of a next cycle of the new signal control plan. If the offset is greater than the threshold percentage of the cycle length, the method includes increasing the time period of each phase of the next cycle of the new signal control plan. The method also includes executing the new signal control plan.
1. A method for performing a single cycle offset adjustment of a traffic signal comprising:
receiving a current signal control plan and a new signal control plan;
calculating an offset between the current signal control plan and the new signal control plan;
determining if the offset is less than a threshold percentage of a cycle length of the new signal control plan;
based on determining that the offset is less than the threshold percentage of the cycle length of the new signal control plan, reducing a time period of each phase of a next cycle of the new signal control plan;
based on determining that the offset is greater than or equal to the threshold percentage of the cycle length of the new signal control plan, increasing the time period of each phase of the next cycle of the new signal control plan; and
executing the new signal control plan.
2. The method of claim 1 , further comprising executing the new signal control plan after the current signal control plan has been executed.
3. The method of claim 1 , wherein reducing the time period of each phase of a next cycle of the new signal control plan comprises proportionally reducing the time period of each phase of the next cycle of the new signal control plan based on a percentage of the cycle length assigned to each phase.
4. The method of claim 1 , wherein increasing the time period of each phase of a next cycle of the new signal control plan comprises proportionally increasing the time period of each phase of the next cycle of the new signal control plan based on a percentage of the cycle length assigned to each phase.
5. The method of claim 1 , wherein the threshold percentage is fifteen percent.
6. The method of claim 1 , wherein the offset is calculated as the difference in a staring time of a first phase of the current signal control plan and a first phase of the new signal control plan.
7. The method of claim 6 , wherein the first phase of the current signal control plan and the first phase of the new signal control plan both correspond to an identical traffic condition.
8. The method of claim 1 , wherein the current signal control plan comprises four phases including a main street left turn phase, a main street through phase, a side street left turn phase, and a side street through phase.
9. The method of claim 1 , wherein the new signal control plan comprises four phases including a main street left turn phase, a main street through phase, a side street left turn phase, and a side street through phase.
10. A traffic signal controller comprising:
a processor configured to operate a traffic signal, the processor configured to perform a method comprising:
receiving a current signal control plan and a new signal control plan;
calculating an offset between the current signal control plan and the new signal control plan;
determining if the offset is less than a threshold percentage of a cycle length of the new signal control plan;
based on determining that the offset is less than a threshold percentage of the cycle length of the new signal control plan, reducing a time period of each phase of a next cycle of the current signal control plan;
based on determining that the offset is greater than or equal to the threshold percentage of the cycle length of the new signal control plan, increasing the time period of each phase of the next cycle of the new signal control plan;
executing the new signal control plan.
11. The traffic signal controller of claim 10 , wherein the current signal control plan and the new signal control plan are received from a traffic management system.
12. The traffic signal controller of claim 10 , wherein reducing the time period of each phase of a next cycle of the new signal control plan comprises proportionally reducing the time period of each phase of the next cycle of the new signal control plan based on a percentage of the cycle length assigned to each phase.
13. The traffic signal controller of claim 10 , wherein increasing the time period of each phase of a next cycle of the new signal control plan comprises proportionally increasing the time period of each phase of the next cycle of the new signal control plan based on a percentage of the cycle length assigned to each phase.
14. The traffic signal controller of claim 10 , wherein the threshold percentage is fifteen percent.
15. The traffic signal controller of claim 10 , wherein the offset is calculated as the difference in a staring time of a first phase of the current signal control plan and a first phase of the new signal control plan.
16. The traffic signal controller of claim 15 , wherein the first phase of the current signal control plan and the first phase of the new signal control plan both correspond to an identical traffic condition.
17. The traffic signal controller of claim 10 , wherein the current signal control plan comprises four phases including a main street left turn phase, a main street through phase, a side street left turn phase, and a side street through phase.
18. The traffic signal controller of claim 10 , wherein the new signal control plan comprises four phases including a main street left turn phase, a main street through phase, a side street left turn phase, and a side street through phase.
19. The traffic signal controller of claim 10 , further comprising a memory for storing the current signal control plan and the new signal control plan.
20. A computer program product for performing single cycle offset adjustment for a traffic signal, the computer program product comprising:
a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
executing a signal control plan having a cycle length;
receiving a new signal control plan;
calculating an offset between the signal control plan and the new signal control plan;
determining if the offset is less than a threshold percentage of the cycle length;
based on determining that the offset is less than a threshold percentage of the cycle length, reducing a time period of each phase of a next cycle of the new signal control plan;
based on determining that the offset is greater than or equal to the threshold percentage of the cycle length, increasing the time period of each phase of the next cycle of the new signal control plan;
executing the new signal control plan.