CN201177875Y

CN201177875Y - Traffic light control apparatus capable of preventing crossroad junction

Info

Publication number: CN201177875Y
Application number: CNU2007201737434U
Authority: CN
Inventors: 张孜纶
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-10-23
Filing date: 2007-10-23
Publication date: 2009-01-07
Anticipated expiration: 2017-10-23

Abstract

The utility model relates to a traffic light control device which can prevent an intersection from being blocked, and is composed of a central processing unit, a signal lamp control unit, a vehicle detecting unit, a detector and a communication interface. The control device is characterized in that a vehicle detector is mounted at the exit of each intersection, and the detector is connected with the vehicle detecting unit; the vehicle detecting unit is connected with the central processing unit, and the central processing unit is connected with the signal lamp control unit and the communication interface. The control device has the advantages that the intersection can be prevented from being blocked by vehicles, thereby avoiding the vicious circle, and the effect on traffic capacity. The control device has the advantages of lower cost, and convenient popularization and application.

Description

Can prevent the traffic-light control device that the crossing blocks

Technical field

The utility model relates to a kind of traffic signals (traffic lights) control device, particularly can prevent the crossing by vehicle block traffic-control unit.

Background technology

At present, known traffic-control unit has following two big classes:

1, timing controlled class

The traffic-control unit at most of crossing all is to adopt let pass the in turn vehicle of all directions of method regularly.The clearance time of each direction all is to set in advance, and what situation is line portals be not after the time, all can change another direction vehicle of letting pass.The all directions vehicle wheel is banished row.The controller low price of this traffic lights, usage quantity is very big.

2, Based Intelligent Control class

At present, part " intelligent " traffic-control unit is also arranged.By being installed in the vehicle detection apparatus on the signal controller, can adjust the clearance time automatically according to the vehicle condition at crossing, the direction clearance time that car is many automatically prolongs, and the direction that car the is few time of letting pass shortens automatically, reaches the purpose that improves the crossing traffic capacity.In addition, by receiving the traffic control center instruction, the traffic-control unit of adjusting all directions clearance time automatically also can be included into intelligent traffic-control unit classification.This class traffic-control unit price comparison costliness, usage quantity is smaller.

Above-mentioned in actual use two class signal control devices tend to occur following problem:

When vehicle passed through the crossing, travel by the indication of traffic signals: during green light, vehicle can enter and pass through the crossing; During red light, vehicle should be waited for after the crossing enters the mouth stop line.Sometimes, cause exit, crossing road congestion, cause the vehicle that sails the crossing into by green light waits of can't can only stopping by the crossing, have a lot of vehicle queues when serious, even can be discharged to the stop line position that enters the mouth, crossing because the place ahead car is many.Like this, when another direction becomes green light, be parked in the vehicle that other directions will be blocked by the middle fleet in crossing, they can't be passed through, cause the crossing to block easily.And in case block and cause the disorder formation vicious cycle in crossing, need to recover unimpeded for a long time, have a strong impact on the crossing traffic capacity.

Above-mentioned two class signal control devices all can't address this problem, and are especially obvious with the time-controlled device of the first kind.

Summary of the invention

The purpose of this utility model is to provide a kind of traffic-light control device that prevents that the crossing from blocking, and it is that a kind of and existing signal control device matches, and prevents that the crossing from being blocked by above-mentioned reason, ensures the traffic-light control device of The coast is clear.

The utility model can judge whether exit, crossing road blocks up, and changes the signal indicating status when getting congestion, forbid the related side to vehicle continue to sail into the crossing, guarantee space, the crossing free time.Like this, when other direction vehicles are current by signal, can pass through the crossing smoothly.

The technical solution of the utility model is:

It comprises CPU (central processing unit), signal lamp control module, vehicle detection unit, communication interface, it is characterized in that: CPU (central processing unit) is connected with signal lamp control module, communication interface, vehicle detection unit respectively; The vehicle detection unit is connected with detecting device; The signal lamp control module is connected with traffic lights; Be respectively equipped with detecting device and traffic lights in each exit, crossing.

The quantity of described detecting device is more than one, and total surveyed area is 0 to 50 meter apart from the crossing distance.

When the outlet of certain direction is many motor vehicle tracks, detecting device is set at every car lane.

Described detecting device is high and low level digital signal to the signal of vehicle detection unit output.

The basic control mode of traffic signals still for letting pass in turn, determine by crossing inherent condition and demand by clearance cycle and all directions clearance time.

At exit road specific region, crossing mounting vehicle detecting device.Detecting device can be induction, Video Detection, Ultrasonic Detection, Microwave Measurement, infrared detection etc.As long as can distinguish whether vehicle is arranged in the surveyed area, for example: detecting device was output as low level " 0 " when surveyed area had car, and detecting device is not output as high level " 1 " when having car.Can by certain rule a plurality of detecting devices be installed according to exit, crossing situation, form a detector set: carry out logic determines by output, in the time of can solving many tracks and the vehicle problem that still can effectively detect when failing just in time to be parked in the detection zone to each detecting device in the detector set.

Judge that the ultimate principle whether exit, crossing road blocks up is:

Road just often, the time of the vehicle that travels continuously by single detection zone is generally shorter, this detecting device output is presented as the variation of high-low level.When detection zone generation road congestion, vehicle can be slack, and corresponding detecting device output is low level " 0 " for a long time.When low level time (down time) exceeds predefined numerical value, for example 10 seconds even longer, can think that this detection zone place blocks up.

By logic determines is carried out in the output of each detecting device in the aforesaid detector group, can judge whether exit, crossing road blocks up.

If certain exports out road traffic congestion, by the logical relation of setting in advance with the related side to permission right of way signal (green light) signal (red light) that becomes that no through traffic.

When road traffic congestion of certain exit is only arranged, let pass simultaneously, continue to let pass with incoherent other direction vehicles of this outlet by natural period and clearance time.

Advantage of the present utility model is: the utility model can prevent that the crossing from being blocked by vehicle, forms vicious cycle, influences the crossing traffic capacity.Cost of the present utility model is lower, and is easy to utilize.

Description of drawings

Fig. 1 is a principle of work block scheme of the present utility model.

Fig. 2 is to use traffic intersection synoptic diagram of the present utility model.

Embodiment

Below in conjunction with drawings and Examples the utility model is further specified.

As shown in Figure 1, the utility model comprises: CPU (central processing unit) 1, signal lamp control module 2, vehicle detection unit 3, detecting device 5, communication interface 4.Wherein, described detecting device 5 is installed in the exit, crossing, and detecting device 5 is connected with vehicle detection unit 3; Vehicle detection unit 3 is connected with CPU (central processing unit) 1; Central control unit 1 is connected with signal lamp control module 2, communication interface 4.

The quantity of described detecting device 5 is more than one, and total surveyed area is 0 to 50 meter apart from the crossing distance.When the outlet of certain direction is many motor vehicle tracks, detecting device 5 is set at every car lane.

Described CPU (central processing unit) 1 comprises CPU, storer etc., be used for to each parts in installing control, logic determines etc., by its work of internal control software control.

Described signal lamp control module 2 is circumscribed with traffic lights L1, L2, L3, L4, by the on and off of CPU (central processing unit) 1 each light fixture of instruction control.

Described vehicle detection unit 3 can external a plurality of vehicle detection apparatus, have or not the information of vehicle to be sent to CPU (central processing unit) 1 each check point, carry out logic determines for it.

Described communication unit 4 is used for and the traffic control center communication.

Traffic intersection synoptic diagram as shown in Figure 2 is provided with traffic lights L1, L2, L3, L4 (every group has each one in red, yellow, green light) on crossing A, B, C, D four direction, control the vehicle that A, B, C, D four direction travel respectively; Be respectively equipped with detecting device 5 (symbol among the figure in the exit of crossing A, B, C, D four direction

).

For the explanation course of work is set following decision condition and parameter (should determine according to the crossing condition during practical application):

Setting the crossing release manner is:

Phase one: L1, L3 let pass 45 seconds time (green light);

Subordinate phase: L2, L4 let pass 45 seconds time (green light).

Above-mentioned two step cycle operation.

The characteristic of detecting device 5 is: detecting device was output as low level " 0 " when surveyed area had car, and detecting device is not output as high level " 1 " when having car.

During normal the clearance, 5 times of vehicle passing detection device are about 0.5 second (36 kilometers/hour of the speed of a motor vehicle, 5 meters of vehicle commanders), and promptly the low-level pulse width of detecting device 5 is about 0.5 second.

According to the crossing concrete condition, setting the traffic congestion decision condition is 10 seconds.

The course of work:

When beginning during above-mentioned phase one, promptly L1, L3 become green light and the minimum green time of letting pass after, CPU (central processing unit) 1 begins to monitor two detecting devices 5 at A place and C place.

At this moment, traffic congestion occurs as outlet C place, vehicle will be parked on the C place detecting device 5 motionless, and C place detecting device 5 is output as low level " 0 ".Surpass 10 seconds when vehicle is parked in time on the C place detecting device 5 (for 20 times of normal time), decidable is road C outlet traffic congestion.In case vehicle leaves, C place detecting device 5 high level occurs and vehicle next time passed through the time (low level time) less than 10 seconds, is judged to be road C and recovers unimpeded.

If the C outlet is blocked up, CPU (central processing unit) 1 is sent instruction and is given signal lamp control module 2, and corresponding with it L3 signal lamp is reddened, and forbids that the follow-up vehicle of road C continues to enter the crossing, prevents that vehicle from stopping at the crossing middle section.

At this moment, if road A outlet is normal, L1 continues as green light, the vehicle of the road A direction that can continue to let pass.When the clearance time arrived 45 seconds that set in advance, L1 also became red light, after the light color transition state, began to carry out subordinate phase.

The beginning subordinate phase, after L2, L4 became green light, CPU (central processing unit) began to monitor two wagon detectors of B, D, same phase one of groundwork process.

In above-mentioned a certain (as the first) stage, do not arrive when the clearance time of setting, and recovered unimpeded after the road C traffic congestion, whether signal lamp L3 recovers green light, can be under guaranteeing that safety is for the prerequisite of principle, according to finishing how long to set in addition apart from this stage.

For avoiding road when traffic congestion, vehicle is not parked in the flase drop that causes on the detecting device just, can set up a plurality of detecting devices 5 in same track at a certain distance, with the testing result phase " or ", can be used as the condition of judging whether this track blocks up.

When the crossing direction has many exit lanes, can establish a plurality of detecting devices and detect different tracks, with the testing result phase " with ", can be used as and judge that this place exports the condition that whether blocks up.

Claims

1, can prevent the traffic-light control device that the crossing blocks, it comprises CPU (central processing unit), signal lamp control module, vehicle detection unit, communication interface, it is characterized in that: CPU (central processing unit) is connected with signal lamp control module, communication interface, vehicle detection unit respectively; The vehicle detection unit is connected with detecting device; The signal lamp control module is connected with traffic lights; Be respectively equipped with detecting device and traffic lights in each exit, crossing.

2, the traffic-light control device that prevents that the crossing from blocking according to claim 1 is characterized in that: the quantity of described detecting device is more than one, and total surveyed area is 0 to 50 meter apart from the crossing distance.

3, the traffic-light control device that prevents that the crossing from blocking according to claim 1 is characterized in that: when the outlet of certain direction is many motor vehicle tracks, at every car lane detecting device is set.

4, the traffic-light control device that prevents that the crossing from blocking according to claim 1 is characterized in that: described detecting device is high and low level digital signal to the signal of vehicle detection unit output.