The invention discloses a crossing traffic jam judging and control method and system based on sensing detectors. The method includes the steps that according detection signals sent by the sensing detectors, a signal light control device calculates the traffic intensity of a crossing every other set statistic cycle, calculates the time occupancy for each sensing detector in a set time period every other set sampling cycle and further determines whether lanes where the sensing detectors are located are in the jam state or not, and if the crossing traffic intensity calculated in the current statistic cycle is judged to exceed a set traffic intensity threshold value and the lanes are in the jam state, the traffic condition of the crossing is judged to be the jam condition of queue overflow and traffic signal lights at the crossing are controlled according to a traffic signal light control scheme corresponding to the jam condition of the queue overflow. According to the method, the crossing jam condition is detected through the small invested cost and the small road jam area, the traffic signal lights at the crossing are controlled, and therefore the traffic circulation of vehicles at the crossing is guaranteed.

Crossing traffic jam judging and control method and system based on sensing detectors

The invention discloses an establishing method and a working method for a traffic overflowing coordinate control optimization model. The establishing method includes the following steps that a queuing length limiting condition model is established to obtain a phase different range which can prevent traffic overflowing from occurring; a phase different optimizing method is established based on the minimum delay to obtain a function relation between phase difference and delay time; according to different restraints, on the phase difference, of the queuing length limiting condition model and the minimum delay phase difference optimization method, the two restraints are combined to take the minimum value in an intersection, so that the traffic overflowing coordinate control optimization model which not only can prevent overflowing from occurring, but also can minimize vehicle delay time is obtained. The establishing method and working method have the advantage that the traffic overflowing phenomenon is effectively prevented from occurring at the morning and evening peak periods of city primary roads.

Establishing method and working method for traffic overflowing coordinate control optimization model

The invention relates to a traffic overflow inhibition method based on high altitude video information. Compared with the prior art, the traffic overflow inhibition method based on the high altitude video information overcomes the defect that no automation inhibition method for solving the problem of traffic overflow exists in the prior art. The traffic overflow inhibition method based on the high altitude video information includes following steps: erecting a high altitude camera, and communicating the camera and a signal controller with an information center through a wired network or a wireless network; performing distance calibration on a camera image and actual distance of a road; setting overflow queuing length threshold value; calculating saturation flow and traffic capacity of a lane; calculating the maximum queuing length and saturation in each signal cycle of the lane; judging out a mapping relation of average increasing velocity and the saturation of the queuing length; forecasting a cycle reaching the overflow length threshold value; adjusting matching time of upstream and downstream signal lamps. The traffic overflow inhibition method based on the high altitude video information can grasp increasing and dissipating rules of the queuing length before the traffic overflow occurs, and forecasts an occurring cycle of the traffic overflow.

Traffic overflow inhibition method based on high altitude video information

The invention discloses an intersection signal timing optimization method based on the queue length of vehicles. The maximum queue length is calculated according to the queue length of the vehicles at the end of a red light, according to the maximum queue length, green time required by a phase position is calculated, according to the green time of the phase position, a signal timing dual-loop structure is optimized, and a nesting phase position is made; compared with classical time-headway-based inductive control, the method obtains a better effect, is not sensitive to queue length error estimation, and can still obtain a good control effect even if some errors exit.

Intersection signal timing optimization method based on queue length of vehicles

The invention relates to a distinguishing method, in particular to a method for distinguishing the supersaturation state of signal intersections, and aims at solving the problem that in the current distinguishing method, whether the intersection is in the supersaturation state or not is mainly distinguished according to the queuing length, and the queuing length dynamically changes under the influence of signal lamps, so that accurate measurement is difficult; as a result, the distinguishing precision is low. The method comprises the following steps: arranging a video detector at the stop line of each entrance of the signal intersection, and continuously arranging two induction coils at the position 30 m away from the down stream of the exit of the signal intersection; collecting traffic flow data through the video detectors and induction coil detectors arranged at intersections and road segments; transmitting the data collected by the detectors and signal timing plans stored by signal intersection annunciators to a transport management center through communication lines; distinguishing the state of the intersections. The method is used in the field of transportation.

Method for distinguishing supersaturation state of signal intersections

The invention discloses an optimization method for signal coordination control of urban road intersections under an over-saturation condition. Compared with the prior art, based on analysis of upstream and downstream traffic stream states of adjacent intersections, through using the wave theory for reference, and by comparing sizes of stop waves of upstream intersections and start waves of downstream intersections as well as vehicle queue conditions of upstream intersections in an artery direction, status values of signal control intersections are determined, and the signal coordination control reliable interval (phase difference) under different states is obtained, accordingly, queue overflow of over-saturation intersections can be controlled within a certain range, the probability of deadlocks at the over-saturation intersections can be reduced greatly, and the queue overflow becomes beneficial self-adjustment of the road intersections under the over-saturation condition.

Optimization method for signal coordination control of urban road intersections under over-saturation condition

Mechanism Analysis and Optimization of Signalized Intersection Coordinated Control under Oversaturated Status

A Strategy on Coordination Control under Saturated Condition

This paper presents a framework for simultaneous bidding and pricing strategy for wholesale market participation of electric vehicle (EV) charging stations aggregator. The proposed framework incorporates the EV charging stations’ technical constraints as well as EV owners’ preferences. A bi-level optimization is adopted to model the problem. In the upper level, the total profit of the EV charging station aggregator is maximized. In the lower-level problem, the EV owner’s utility function is maximized. The EV owners’ preferences are modeled using the quadratic utility function. The bi-level optimization problem which is non-convex and hard to solve is converted to a mixed-integer convex quadratic programming model by writing the optimal conditions of the lower-level problem that is solvable with commercial solvers. The effectiveness of the proposed framework is investigated by implementing simulation results.

Liqun Qi

Papers

Optimization method for signal coordination control of urban road intersections under over-saturation condition

Mechanism Analysis and Optimization of Signalized Intersection Coordinated Control under Oversaturated Status

A Strategy on Coordination Control under Saturated Condition

EV Charging Station Wholesale Market Participation: A Strategic Bidding and Pricing Approach