CN1067978A - Urban traffic lights control scheme and device - Google Patents

Abstract

A kind of urban highway traffic lights control scheme and device for carrying out said, the light on and off that standard time that the employing public can grasp and Changing Pattern are controlled the intersection traffic lights, make the vehicle driver can be by means of certain device, learn the state of intersection, the place ahead traffic lights in advance, rationally adjust the speed of a motor vehicle, reduce wait number of times and the time of vehicle by the intersection.

Description

Urban traffic lights control scheme and device

The present invention proposes a kind of controlling schemes and device for carrying out said of urban road junction traffic lights.

At present, the traffic lights of city intersection widespread use electronic circuit is controlled, and most control modes that adopt Fixed Time Interval, the green light that is certain direction is after bright one period regular time, flicker is just extinguished for several times, then amber light extinguished after bright a bit of regular time, and then red light extinguished after bright one period regular time again, so again and again circulation.The logical condition that the traffic lights of other directions forms according to traffic rules, also corresponding light on and off.Though this control mode can alleviate the influence of traffic-police's labour intensity and subjective factor, but concerning the driver, only reach and close on the intersection at car, could be according to the indication of traffic lights, determine and to pass through, if can not pass through, just allow to pass through after also being difficult to how long predict after.Like this, the driver can only obey the commander of traffic lights passively, can not utilize to arrive the crossing reasonable change of interior travel speed for the previous period, reduces wait number of times and time in the intersection, and this is one of reason that causes the urban traffic congestion.

The purpose of this invention is to provide a kind of controlling schemes and device for carrying out said, make that the light on and off Changing Pattern of each intersection traffic lights is definite, and be known to the public, thereby make the driver can be by means of certain device, give the state of learning intersection, the place ahead traffic lights earlier, rationally adjust the speed of a motor vehicle, reduce wait number of times and the time of vehicle by the intersection.

The object of the present invention is achieved like this: produce frequency accurately by high-precision quartz oscillator, through frequency division and calibration, produce with selected time reference for example with the synchronous standard time of Beijing time, the error of the standard time that its long-term accumulation error and the public are grasped is compared and can be allowed and be to calibrate.With this standard time value is independent variable, controls the light on and off of traffic lights according to the Changing Pattern of determining, this Changing Pattern is a periodic function, and its cycle can be 24 hours, a week or other.Each intersection can be presided over a whole set of standards change rule of formulating or passing from the Competent Authorities of Transport and Communications according to factors such as the vehicle flowrate of reality, peak periods, determines a kind ofly, and is announced.Learn the Changing Pattern of each intersection the public after,, just can try to achieve the traffic light status of required intersection according to the standard time of grasping separately.Can be grasped by the public with second or higher precision by the time reference that what is selected, therefore, the state of traffic lights also can be grasped by the public with the precision of same grade.

The traffic lights control device is core with the computing machine, producing clock frequency accurately by high-precision quartz oscillator uses for the timer of computing machine, timer is by strict periodic refreshing time value register, and by display demonstration time value, this value keys available is calibrated.The traffic lights Changing Pattern of a complete set of standard deposits the storer of computing machine in the certain structure form, and can select one by outside connected switch.Computing machine is tried to achieve real-time control data according to time value and definite Changing Pattern, and it is connected with traffic lights through interface circuit, controls the light on and off of each traffic lights.

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is the schematic block circuit diagram of present embodiment.

Fig. 2 is the program flow diagram of present embodiment.

Among the figure, I, high-precision quartz crystal oscillator II, computer motherboard III, display key plate IV, input/output board V, Changing Pattern selector switch VI, traffic lights drive plate VII, traffic lights VIII, control device power supply 1, program begin frame 2,5,6,7,8,9, routine processes frame 3,4, logic determines frame

Present embodiment adopts the single-chip microcomputer essential bus FD-BASE industrial products of Fudan University in Shanghai, I among Fig. 1, II, constitute by the BASE8802 motherboard, the CPU of this plate is INTEL8031, can be with the EPROM of 64K, for improving the accuracy of time, the quartz crystal oscillator of raw sheet should change into is with thermostatically controlled high-precision quartz crystal oscillator, III, select the BASE8851LED keyboard and display panel for use, LED is used for data such as demonstration time, keyboard is used for functions such as time calibration, IV, select BASE8820 input/output board able to programme for use, 48 tunnel input/output ports able to programme are arranged, V, select two 8421 code switchs for use, be used to select 100 kinds of different Changing Patterns.VI, select two BASE8860, eight road photoelectric isolating relay output boards for use, its contact capacity is 220 volt of 3 peace, can be directly or through the light on and off of overdrive circuit control traffic lights, VII, be original traffic lights, VIII, select BASE8875A Switching Power Supply plate for use, and equipped capacitor is that 50 volt-amperes, power-on time are 24 hours uninterrupted power source, makes the control device still can operate as normal in less than one day power-off time, and do not need artificial dried giving after restoring electricity.Select BASE88508 eight scouring machine cages for use with upper-part, connect, constitute the hardware system of present embodiment with the FD-BASE bus mother board.

Among Fig. 2, frame 1, representation program begin, frame 2, expression initialization process program, frame 3,0.1 second interrupt logic of expression timer are judged, frame 4, expression keyboard request inquiry judging, frame 5, express time value register refresh process program, frame 6, express time calibration process program, frame 7, expression Changing Pattern selector switch code read-in programme, frame 8, expression are by the handling procedure of time value and selector switch codelookup Changing Pattern, and frame 9, expression are calculated each traffic light status and exported the handling procedure of controlling value.In the program, except that the part that real-time is had relatively high expectations was used the compilation Programming with Pascal Language, all the other were all write with BASIC, by the MBASIC compiling system compiling of the senior universal emulator of FD-SICE-IV.

Code name of hypothesis is 13 24 hours period Changing Patterns below, is that example illustrates with a direction:

Time traffic lights alternate cycle

0:00-5:00 10 seconds

5:00-6:00 15 seconds

6:00-20:00 20 seconds

20:00-0:00 15 seconds

After the public learns the Changing Pattern of these traffic intersection traffic lights, just can determine the state of this direction traffic lights of random time, for example 6: 01: 33, this direction was a red light, and just becomes green light after 7 seconds.

The enforcement of another patent of invention that the social benefit of this invention is applied for simultaneously by me " traffic lights state prediction and indicating device " embodies.

Claims (2)

1, a kind of controlling schemes of urban road junction traffic lights, it is characterized in that: be independent variable with time, control the light on and off of traffic lights according to the definite Changing Pattern in each crossing, these rules are presided over by the Competent Authorities of Transport and Communications and are formulated or pass, they are periodic functions, known to the public.

2, controlling schemes according to claim 1, its device for carrying out said is made of computing machine, interface circuit, external unit, and its feature is: produce clock frequency with quartz oscillator, through frequency division and calibration, make it synchronous with selected time reference; A whole set of traffic lights Changing Pattern deposits the storer of computing machine in the certain structure form, for selecting for use each intersection.

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