External adaptive control systems and methods
First Claim
1. A method for controlling traffic movements for a plurality of traffic intersections each having a volume of traffic comprising:
- determining a critical intersection having a most conflicting volume from among the volumes;
determining a plan comprising at least one guaranteed green time and at least one minimum green duration for at least one direction of traffic movement at the critical intersection and a period for the plan;
determining other plans each comprising another guaranteed green time and another minimum green duration for another intersection based on the at least one guaranteed green time and the at least one minimum green duration at the critical intersection and an expected travel time between the critical intersection and the other intersection, each other plan having another period;
determining at least one non-linear schedule for the critical intersection at an external adaptive control system based on the plan and queue lengths for individual phases at the critical intersection, the non-linear schedule comprising a plurality of states having a variable order, each state having a state start time and a state duration;
determining other non-linear schedules for the other intersections at other external adaptive control systems based on the other plans and other queue lengths for other individual phases for the other intersections, each other non-linear schedule comprising another plurality of other states having another state order, each other state having another state start time and another state duration;
controlling at least one traffic signal controller assembly at the critical intersection by the external adaptive control system according to the at least one non-linear schedule; and
controlling other traffic signal controller assemblies at the other intersections by the other external adaptive control systems according to the other non-linear schedules.
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Accused Products
Abstract
An external adaptive control system controls a traffic signal at a critical intersection that has a most conflicting volume of traffic among volumes of traffic at intersections in a traffic network. The external adaptive control system determines a plan identifying a guaranteed green light time and a minimum green duration and a period for the plan. The external adaptive control system determines, based on the plan, a non-linear schedule with one or more states corresponding to one or more individual phases with each state having a state start time and a state duration. Queues for individual traffic movements at the critical intersection also may be used to determine the non-linear schedule. The adaptive external control system controls the traffic signal according to the non-linear schedule. The external adaptive control system transmits its plan to one or more other external adaptive control systems for other intersections. The other external adaptive control systems determine other plans based on the plan from the external adaptive control system and an expected travel time between the critical intersection and the corresponding intersection.
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Citations
75 Claims
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1. A method for controlling traffic movements for a plurality of traffic intersections each having a volume of traffic comprising:
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determining a critical intersection having a most conflicting volume from among the volumes; determining a plan comprising at least one guaranteed green time and at least one minimum green duration for at least one direction of traffic movement at the critical intersection and a period for the plan; determining other plans each comprising another guaranteed green time and another minimum green duration for another intersection based on the at least one guaranteed green time and the at least one minimum green duration at the critical intersection and an expected travel time between the critical intersection and the other intersection, each other plan having another period; determining at least one non-linear schedule for the critical intersection at an external adaptive control system based on the plan and queue lengths for individual phases at the critical intersection, the non-linear schedule comprising a plurality of states having a variable order, each state having a state start time and a state duration; determining other non-linear schedules for the other intersections at other external adaptive control systems based on the other plans and other queue lengths for other individual phases for the other intersections, each other non-linear schedule comprising another plurality of other states having another state order, each other state having another state start time and another state duration; controlling at least one traffic signal controller assembly at the critical intersection by the external adaptive control system according to the at least one non-linear schedule; and controlling other traffic signal controller assemblies at the other intersections by the other external adaptive control systems according to the other non-linear schedules. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method for controlling traffic movements for a plurality of traffic intersections each having a volume of traffic comprising:
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determining a critical intersection for a main street having a most conflicting volume from among the volumes; determining a plan comprising at least one guaranteed green time and at least one minimum green duration for at least one direction of traffic movement at the critical intersection; determining other plans each comprising another guaranteed green time and another minimum green duration for another intersection based on the at least one guaranteed green time and the at least one minimum green duration at the critical intersection and an expected travel time between the critical intersection and the other intersection; determining at least one non-linear schedule for the critical intersection at an external adaptive control system based on the at least one guaranteed green time, the at least one minimum green duration, the period, and queue lengths for individual phases at the critical intersection, the non-linear schedule comprising a plurality of states having a variable order, each state having a state start time and a state duration; determining other non-linear schedules for the other intersections at other external adaptive control systems based on the other guaranteed green times, other minimum green durations, and other queue lengths for other individual phases for other intersections, each other non-linear schedule comprising another plurality of other states having another state order for a corresponding other intersection, each other state having another state start time and another state duration; sequentially generating presence data at the external adaptive control system for each state in the non-linear schedule in the variable order starting at each state start time and for each state duration and sequentially transmitting the presence data corresponding to each state at each state start time and for each corresponding state duration from the external adaptive control system for reception by at least one traffic signal controller assembly; and sequentially generating other presence data at the other external adaptive control systems for other states in the other non-linear schedules in the other variable orders starting at the other state start times and for the other state durations and sequentially transmitting the other presence data corresponding to each other state at each other state start time and for each other state duration from each corresponding other external adaptive control system for reception by a corresponding other traffic signal controller assembly. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38)
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39. A method for controlling traffic movements for a plurality of traffic intersections each having a volume of traffic comprising:
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determining a critical intersection having a most conflicting volume from among the volumes; determining a plan with at least one guaranteed green time and at least one minimum green duration for at least one direction of traffic movement at the critical intersection; determining other guaranteed green times and other minimum green durations for other intersections based on the at least one guaranteed green time and the at least one minimum green duration at the critical intersection and an expected travel time between the critical intersection and the other intersections; determining at least one schedule for the critical intersection at an external adaptive control system based on the at least one guaranteed green time and the at least one minimum green duration, the schedule comprising a plurality of states having a variable order; determining other schedules for the other intersections at other external adaptive control systems based on the other guaranteed green times, each other schedule comprising another plurality of other states having another variable order; controlling at least one traffic signal controller assembly at the critical intersection by the external adaptive control system according to the at least one schedule; and controlling other traffic signal controller assemblies at the other intersections by the other external adaptive control systems according to the other schedules. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. A system for controlling traffic movements for a plurality of traffic intersections each having a volume of traffic, the system comprising:
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an external adaptive control system at a critical intersection having a most conflicting volume from among the volumes and configured to; determine a plan comprising at least one guaranteed green time and at least one minimum green duration for at least one direction of traffic movement at the critical intersection and a period for the plan; determine at least one non-linear schedule for the critical intersection based on the plan and queue lengths for individual phases at the critical intersection, the non-linear schedule comprising a plurality of states having a variable order, each state having a state start time and a state duration; and control at least one traffic signal controller assembly at the critical intersection according to the at least one non-linear schedule; and a plurality of other external adaptive control systems, each other external adaptive control system configured to; determine a corresponding plan, each corresponding plan comprising a corresponding guaranteed green time and a corresponding minimum green duration for a corresponding intersection based on the at least one guaranteed green time and the at least one minimum green duration at the critical intersection and an expected travel time between the critical intersection and the corresponding intersection, each corresponding plan having a corresponding period; determine a corresponding non-linear schedule for the corresponding intersection based on the corresponding plan and corresponding queue lengths for corresponding individual phases for the corresponding intersection, each corresponding non-linear schedule comprising another plurality of corresponding states having a corresponding state order, each corresponding state having a corresponding state start time and a corresponding state duration; and control a corresponding traffic signal controller assembly at the corresponding intersection according to the corresponding non-linear schedule. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68)
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69. A system for controlling traffic movements for a plurality of traffic intersections each having a volume of traffic, the system comprising:
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an external adaptive control system at a critical intersection having a most conflicting volume from among the volumes and configured to; determine a plan comprising at least one guaranteed green time and at least one minimum green duration for at least one direction of traffic movement at the critical intersection and a period for the plan; determine at least one non-linear schedule for the critical intersection based on the at least one guaranteed green time, the at least one minimum green duration, the period, and queue lengths for individual phases at the critical intersection, the non-linear schedule comprising a plurality of states having a variable order, each state having a state start time and a state duration; sequentially generate presence data for each state in the non-linear schedule in the variable order starting at the state start time and for the state duration; and sequentially transmit the presence data corresponding to each state at the state start time and for the corresponding state duration from the external adaptive control system for reception by at least one traffic signal controller assembly; and a plurality of other external adaptive control systems at other intersections configured to; determine other plans each comprising another guaranteed green time and another minimum green duration for another intersection based on the at least one guaranteed green time and the at least one minimum green duration at the critical intersection and an expected travel time between the critical intersection and the other intersection; determine other non-linear schedules for the other intersections based on the other guaranteed green times, other minimum green durations, and other queue lengths for other individual phases for the other intersections, each other non-linear schedule comprising another plurality of other states having another state order for a corresponding other intersection, each other state having another state start time and another state duration; sequentially generate other presence data for other states in the other non-linear schedules in the other variable orders starting at the other state start times and for the other state durations; and sequentially transmit the other presence data corresponding to each other state at each other state start time and for each other state duration for reception by a corresponding other traffic signal controller assembly. - View Dependent Claims (70, 71, 72, 73, 74)
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75. A system for controlling traffic movements for a plurality of traffic intersections each having a volume of traffic, the system comprising:
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an external adaptive control system for a critical intersection having a most conflicting volume from among the volumes and configured to; determine a plan with at least one guaranteed green time and at least one minimum green duration for at least one direction of traffic movement at the critical intersection; determine at least one schedule for the critical intersection based on the at least one guaranteed green time and the at least one minimum green duration, the at least one schedule comprising a plurality of states in a variable order; and control at least one traffic signal controller assembly at the critical intersection according to the at least one schedule; and a plurality of other external adaptive control systems configured to; determine other guaranteed green times and other minimum green durations for other intersections based on the at least one guaranteed green time and the at least one minimum green duration at the critical intersection and an expected travel time between the critical intersection and the other intersections; determine other schedules for the other intersections at other external adaptive control systems based on the other guaranteed green times and the other minimum green durations, each other schedule comprising another plurality of other states in another variable order; and control other traffic signal controller assemblies at the other intersections according to the other schedules.
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Specification