CN104064037A - Highway and city expressway connection part traffic coordination control system - Google Patents

Abstract

The invention relates to a highway and city expressway connection part traffic coordination control system which comprises a traffic flow detector, a traffic signal control machine, a traffic information display screen, and a traffic coordination control machine which are arranged at a highway and city expressway connection part. The traffic signal control machine carries out alternative controlling on the traffic lights of each entrance according to traffic flow detection data and a traffic coordination control machine instruction, the distributed control of the traffic flow in time is realized. The traffic information display screen carries out corresponding prompt displaying according to the traffic coordination control machine instruction, and the traffic diversion control of the traffic flow in space is realized. The traffic coordination control machine receives a highway monitoring center instruction through a wireless network, dynamically optimizes and gives a traffic signal control instruction and a traffic information display instruction and issues the instructions to the traffic signal control machine and the traffic information display screen through a wired network to carry out traffic coordination control.

Description

Highway and city expressway convergence part traffic cooperative control system

Technical field

Patent of the present invention relates to the system that is applied in road traffic signal and traffic guidance Collaborative Control, specifically the traffic cooperative control system of highway and city expressway convergence part.

Background technology

Research shows, under festivals or holidays heavy traffic and low visibility meteorological condition (heavy rain, snow, mist etc.), the freeway toll station traffic of coming in and going out tends to occur seriously blocking up, and traffic hazard probability of happening can significantly increase.Adopt highway and city expressway convergence part traffic Collaborative Control technology, the traffic flow of capable of dynamic optimal control and correct guidance turnover highway, reaches minimizing traffic congestion, object ensures traffic safety.

At present, in China's highway and city expressway convergence part, adopt traffic signals control or traffic guidance indication also seldom, even if adopted, this two between independent operating often, can not realize traffic cooperate optimization and control, control effect and have much room for improvement.Relevant patent is less, the patent No. is 200820150208 patent, a kind of road self-adapting entrance ramp afflux control equipment is provided, for regulating the Entrance ramp of highway main line or urban express way to import flow control, by ring road, import signal lamp and alternately change the object that reaches control flow, only to the magnitude of traffic flow of sailing highway main line or city expressway into is limited, do not have to consider sailing the flow control of freeway toll station into, yet synchronously by traffic guidance, do not indicate and carry out flow-dividing control.The patent No. is 200710038323 patent, a kind of instant condition discrimination and inducible system of urban highway traffic are provided, according to flow, speed, occupation rate, cycle data bag, to setting the traffic behavior in section, judge, and in real time judged result is passed to inducible system and be sent to the traffic scene towards vehicle, there is no to consider the Collaborative Control problem with the control of periphery traffic signals.

Summary of the invention

For above deficiency, the invention provides a kind of traffic cooperative control system for highway and city expressway convergence part, by to the traffic signals of convergence part and traffic guidance synthetic operation, the traffic flow of turnover freeway toll station is carried out to optimal control in dynamic.

The invention provides the traffic cooperative control system of a kind of highway and city expressway convergence part, it is included in traffic flow detecting device, traffic signal controlling machine, traffic information display screen, the traffic Collaborative Control machine of highway and the setting of city expressway convergence part.Traffic flow detecting device is connected with traffic signal controlling machine, and traffic signal controlling machine, traffic information display screen are connected with traffic Collaborative Control machine.A certain main intersection on highway and section, city expressway convergence part arranges traffic signal controlling machine and traffic Collaborative Control machine, at each Way in of this crossing, apart from crossing, 150 meters of arrange traffic flow detecting device, at, 500 meters of upstreams, crossing of through street direction, towards direction to the car, traffic information display screen are set.Traffic flow detecting device adopts video detector, and every cover traffic flow detecting device can detect the automobile traffic flow in four tracks, speed etc. at most, detects data and exports to traffic signal controlling machine by cable network RS422 interface.Traffic signaling equipment detects data according to traffic flow and the instruction of traffic Collaborative Control machine replaces control to the traffic lights of each entrance, realizes traffic flow and controls in the distribution of time.Traffic information display is shielded the instruction according to traffic Collaborative Control machine and is carried out corresponding signal language demonstration, realizes traffic flow flow-dividing control spatially.Traffic Collaborative Control machine receives by wireless network (3G or 4G) instruction that send at freeway surveillance and control center in real time, according to 5 grade optimizings such as superfine response, one-level response, secondary response, three grades of responses and normal responses, provide steering order, and assign to traffic signal controlling machine and traffic information display and shield by cable network RS422 interface, carry out Collaborative Control.

Advantage of the present invention is: considering on the magnitude of traffic flow, weather condition situation basis, by to the traffic signals of convergence part and traffic guidance synthetic operation, optimal control in dynamic is carried out in traffic flow to turnover freeway toll station, reduces traffic congestion, ensures traffic safety.

Accompanying drawing explanation

Figure l is that system of the present invention arranges schematic diagram.

Fig. 2 is that traffic signals control phase of the present invention arranges schematic diagram.

Embodiment

Below in conjunction with drawings and Examples, the invention will be further described.

As shown in Figure 1: select a certain highway and city expressway convergence part, in city expressway section, a right-angled intersection of contiguous freeway toll station, arranges traffic Collaborative Control machine 4 and traffic signal controlling machine 2.Apart from crossing, 150 meters of arrange traffic flow detecting device 1 to each Way at this crossing, adopt video traffic current sensor, 1 entrance arranges 1 cover, detect in real time automobile traffic flow, the speed that each entrance arrives, detect data and within every 30 seconds, to crossing traffic signal controlling machine 2, report and submit once by cable network RS422 interface.At, 500 meters of upstreams, direction crossing, through street, towards direction to the car, traffic information display screen 3 is set.Traffic Collaborative Control machine 4 connects traffic signal controlling machine 2 and traffic information display screen 3 by cable network RS422 interface, and coordinate them and carry out Collaborative Control, traffic Collaborative Control machine 4 receives by wireless network (3G or 4G) instruction that send at freeway surveillance and control center in real time, by 5 grade optimizings such as superfine response, one-level response, secondary response, three grades of responses and normal responses, draws steering order.

The output order of described traffic Collaborative Control machine 4 obtains by following method optimization:

(1) the response grade of traffic Collaborative Control machine

Traffic Collaborative Control machine is accepted the instruction of freeway surveillance and control center and is carried out response at different level.With reference to the Ministry of Public Security, Department of Transportation etc. for freeway traffic regulation relevant requirements under large traffic flow festivals or holidays, low visibility meteorological condition, the response of traffic Collaborative Control machine is divided into 5 grades: superfine response, one-level response, secondary response, three grades of responses, normal response, that is:

Superfine response: because of highway road closure, do not allow vehicle to enter;

One-level response: because of 40 kilometers/hour of Speed Limitation on Freeway, require vehicle slowly to enter;

Secondary response: because of 60 kilometers/hour of Speed Limitation on Freeway, require to reduce vehicle and enter;

Three grades of responses: because of 80 kilometers/hour of Speed Limitation on Freeway, require to reduce vehicle and enter;

Normal response: normally current because of highway, allow vehicle normally to enter.

(2) Collaborative Control of traffic Collaborative Control machine

The control response of traffic Collaborative Control machine comprises the Collaborative Control of traffic signal controlling machine and traffic information display screen, and in same response grade, the two carries out corresponding control response, as shown in table 1.

Table 1 response grade table corresponding to Collaborative Control

(3) control response that traffic signals are controlled

Traffic signal controlling machine detects data according to traffic flow and the instruction of traffic Collaborative Control machine replace control to the traffic lights of each entrance, realizes traffic flow in the distribution control of time, specific as follows described in.

As shown in Figure 2, the signal timing at crossing becomes 4 control phase: A, B, C, D, the corresponding entrance of each control phase, to the left-hand bend of entrance, craspedodrome automobile traffic stream let pass control (right-hand bend traffic flow is not controlled), i.e. A (A1, A2), B (B1, B2), C (C1, C2), D (D1, D2).4 control phases form a circulation, let pass successively, i.e. A → B → C → D → A by counter clockwise direction.For the traffic safety during assurance phase transitions, between adjacent phase, (A → B, B → C, C → D, D → A) adopts amber light transition, and yellow time unification is assumed to be 3 seconds.

1) fixedly timing is controlled

Under superfine response, one-level response, secondary response state, adopt fixedly timing to control.Suppose that the signal period gets 102 seconds, the minimum value of each phase place green time is all set as 10 seconds; Green time (the G of through street direction phase place (A, C) _a,g _c) equal the green time (G of Ordinary Rd direction phase place (B, D) _b,g _d) 2 times.

So, under superfine responsive state, G _a1=G _a=30, G _a2=0; G _b1=G _b2=G _b=15; G _c1=G _c2=G _c=30; G _d2=G _d=15; G _d1=0.

Under one-level responsive state, G _a1=G _a=30, G _a2=10; G _b1=G _b2=G _b=15; G _c1=G _c2=G _c=30; G _d2=G _d=15; G _d1=10.

Under secondary response state, G _a1=G _a=30, G _a2=15; G _b1=G _b2=G _b=15; G _c1=G _c2=G _c=30; G _d2=G _d=15; G _d1=10.

2) adaptive control

Under three grades of responses and normal response state, adopt adaptive control.According to crossing Real-Time Traffic Volume, calculate the green time of signal period and 4 control phases.

The magnitude of traffic flow is than calculating:

The saturation volume of supposing A, C phase place be 3000 minibus units/hour; The saturation volume of B, D phase place be 1500 minibus units/hour.The actual arrival flow Wei810 minibus unit of A phase place/hour; The actual arrival flow Wei150 minibus unit of B phase place/hour; The actual arrival flow Wei750 minibus unit of C phase place/hour; The actual arrival flow Wei180 minibus unit of D phase place/hour.

By can be calculated F _a=0.27, F _b=0.1, F _c=0.25, F _d=0.12, F=0.74

Signal period calculates:

$T=\frac{1.5L+5}{1-F}=88.49,$ Round numbers 88 seconds.

Phase place green time calculates: G _a1=G _a2=G _a=28; G _b1=G _b2=G _b=10; G _c1=G _c2=G _c=26; G _d1=G _d2=G _d=12.

Traffic information display screen carries out corresponding signal language demonstration according to the graduation steering order of traffic Collaborative Control machine, realizes traffic flow flow-dividing control spatially.Under superfine responsive state, show " highway is closed, and no through traffic, please detour "; Under one-level responsive state, show " 40 kilometers of Speed Limitation on Freeway are forbidden danger product vehicle, passenger and freight vehicle pass-through "; Under secondary response state, show " 60 kilometers of Speed Limitation on Freeway, please slow down and go slowly "; Under three grades of responsive states, show " 80 kilometers of Speed Limitation on Freeway, please note traffic safety "; Under normal response state, show " highway is unimpeded ".

Claims (6)

1. highway and city expressway convergence part traffic cooperative control system, it is characterized in that, be included in the traffic flow detecting device (1) that highway and city expressway convergence part arrange, traffic signal controlling machine (2), traffic information display screen (3) and traffic Collaborative Control machine (4), traffic flow detecting device (1) is connected with traffic signal controlling machine (2), traffic signal controlling machine (2), traffic information display screen (3) is connected with traffic Collaborative Control machine (4), described traffic information display screen (3) is arranged on one upstream, crossing, through street of highway and city expressway convergence part, towards direction to the car, described traffic flow detecting device (1) detects the automobile traffic flow in each track, speed, sends to traffic signal controlling machine (2), traffic signal controlling machine (2) detects data according to traffic flow and traffic Collaborative Control machine (4) instruction replaces control to the traffic lights of each entrance, realizes traffic flow and controls in the distribution of time, traffic information display screen (3) according to traffic Collaborative Control machine (4) instruction carry out corresponding signal language demonstration, realize traffic flow flow-dividing control spatially, traffic Collaborative Control machine (4) is accepted the instruction of freeway surveillance and control center by wireless network, dynamic optimization provides traffic signals steering order and traffic information display instruction, assigns respectively to traffic signal controlling machine (2) and traffic information display screen (3) and carries out Collaborative Control.

2. highway according to claim 1 and city expressway convergence part traffic cooperative control system, it is characterized in that, main crossroads on highway and section, city expressway convergence part arrange traffic signal controlling machine (2) and traffic Collaborative Control machine (4), each Way at this crossing arranges traffic flow detecting device (1) apart from 100-150 rice, crossing, at 300-500 rice, the upstream, crossing of through street direction, towards direction to the car, traffic information display screen (3) is set.

3. highway according to claim 1 and city expressway convergence part traffic cooperative control system, it is characterized in that, described traffic flow detecting device (1) adopts video traffic current sensor, and every cover traffic flow detecting device can detect automobile traffic flow, the speed in four tracks on section.

4. highway according to claim 1 and city expressway convergence part traffic cooperative control system, is characterized in that, the output order of described traffic Collaborative Control machine (4) obtains by following method optimization:

(1) traffic Collaborative Control machine is accepted the instruction of freeway surveillance and control center and is carried out response at different level, and the response of traffic Collaborative Control machine is divided into 5 grades:

Superfine response: because of highway road closure, do not allow vehicle to enter;

One-level response: because of 40 kilometers/hour of Speed Limitation on Freeway, require vehicle slowly to enter;

Secondary response: because of 60 kilometers/hour of Speed Limitation on Freeway, require to reduce vehicle and enter;

Three grades of responses: because of 80 kilometers/hour of Speed Limitation on Freeway, require to reduce vehicle and enter;

Normal response: normally current because of highway, allow vehicle normally to enter.

5. highway according to claim 4 and city expressway convergence part traffic cooperative control system, it is characterized in that, the control response of described traffic Collaborative Control machine (4) comprises the Collaborative Control of traffic signal controlling machine (2) and traffic information display screen (3), in same response grade, it is as follows that the two carries out corresponding control response:

Under superfine responsive state, traffic signal controlling machine control is driven towards freeway toll station directional signal light and is kept long red, and traffic information display screen display is shown: highway is closed, and no through traffic, please detour;

Under one-level responsive state, traffic signal controlling machine is controlled the minimum value that the green time drive towards freeway toll station directional signal light is taken as setting, and traffic information display screen display is shown: 40 kilometers of Speed Limitation on Freeway, forbid danger product vehicle, passenger and freight vehicle pass-through;

Under secondary response state, traffic signal controlling machine is controlled half that the green time drive towards freeway toll station directional signal light is taken as setting value, but be not less than the minimum value of setting, traffic information display screen display is shown: 60 kilometers of Speed Limitation on Freeway, and please slow down and go slowly;

Under three grades of responsive states, traffic signal controlling machine carries out adaptive control, and traffic information display screen display is shown: 80 kilometers of Speed Limitation on Freeway, please note traffic safety;

Under normal response state, traffic signal controlling machine carries out adaptive control, and traffic information display screen display is shown: highway is unimpeded.

6. highway according to claim 4 and city expressway convergence part traffic cooperative control system, is characterized in that, the control response that traffic signals are controlled is as follows:

The signal timing at crossing becomes 4 control phase: A, B, C, D, the corresponding entrance of each control phase, to the control of letting pass of the left-hand bend of entrance, craspedodrome automobile traffic stream, be A (A1, A2), B (B1, B2), C (C1, C2), D (D1, D2), 4 control phases form a circulation, by counterclockwise letting pass successively, i.e. A → B → C → D → A, the signal period is set as T second; Traffic safety for during assurance phase transitions, adopts amber light transition between adjacent phase, yellow time unification is set as Y second;

1) under superfine response, one-level response, secondary response state, adopt fixedly timing to control:

Suppose through street direction phase place A, the green time G of C _a,, G _cequal Ordinary Rd direction phase place B, the green time G of D _b,, G _d2 times, T=G so _a+ G _b+ G _c+ G _d+ 4Y=6G _b+ 4Y=6G _d+ 4Y, the minimum green time of phase place A, B, C, D is followed successively by G _amin, G _bmin, G _cmin, G _dmin;

Under superfine responsive state, G _a1=G _a, G _a2=0; G _b1=G _b2=G _b; G _c1=G _c2=G _c; G _d2=G _d; G _d1=0;

Under one-level responsive state, G _a1=G _a, G _a2=G _amin; G _b1=G _b2=G _b; G _c1=G _c2=G _c; G _d2=G _d; G _d1=G _dmin;

Under secondary response state, G _a1=G _a, g _b1=G _b2=G _b; G _c1=G _c2=G _c; G _d2=G _d; $G_{D1}=\mathrm{Max}(\frac{1}{2}{G}_D,G_{D\min });$

2), under three grades of responses and normal response state, adopt adaptive control; The green time that calculates signal period and 4 control phases according to crossing Real-Time Traffic Volume, comprises the steps:

2.1, the magnitude of traffic flow is than calculating:

The magnitude of traffic flow of each phase place than refer to this phase place in a certain amount of time the actual arrival magnitude of traffic flow of corresponding entrance and the ratio of design saturation volume, suppose F _a, F _b, F _c, F _drepresent successively the magnitude of traffic flow ratio of phase place A, B, C, D, so the throughput ratio F=F at crossing _a+ F _b+ F _c+ F _d;

2.2, the signal period calculates:

Calculate according to the following formula the signal period at crossing

$T=\frac{1.5L+5}{1-F}$

In formula: T-optimum signal cycle (second);

The total losses time (second) of L-signal period, i.e. 4Y;

2.3, phase place green time calculates:

$G_{A1}=G_{A2}=G_A=\frac{F_A}{F}(T-4Y);$ $G_{B1}=G_{B2}=G_B=\frac{F_B}{F}(T-4Y);$ $G_{C1}=G_{C2}=G_C=\frac{F_C}{F}$ $(T-4Y);$ $G_{D1}=G_{D2}=G_D=\frac{F_D}{F}(T-4Y).$