CN201741281U

CN201741281U - DSP traffic signals director with GPRS network function

Info

Publication number: CN201741281U
Application number: CN2010202583223U
Authority: CN
Inventors: 毛汉领; 刘绍英; 何明耿
Original assignee: NANNING JUNHOU ELECTROMECHANICAL TECHNOLOGY Co Ltd
Current assignee: NANNING JUNHOU ELECTROMECHANICAL TECHNOLOGY Co Ltd
Priority date: 2010-07-15
Filing date: 2010-07-15
Publication date: 2011-02-09
Anticipated expiration: 2020-07-15

Abstract

Provided is a city road traffic signals director, comprising a traffic signals director and a traffic signals control system. The traffic signals director is connected to a standard wireless network communicator GPRS module and a light color signal circuit. The traffic signals control system is connected to the directors at every crossing in the city through the standard wireless network communicator GPRS module, and is then connected to the database at the data center, thereby wireless network and monitoring management can be achieved.

Description

DSP traffic signal controlling machine with GPRS network savvy

Technical field

The invention belongs to the device of Controlling Traffic Signals in Urban Roads, have GPRS Wireless Networking function, can carry out the interconnect plane management to the traffic signals on all roads of city.

Background technology

Development along with quickening of urbanization process, mechanical transport transportation, the major issue that people, car, road triadic relation's coordination, congested in traffic problem have become vehicle supervision department and faced, the method that effectively addresses this problem has two: the one, enlarging or newly-built road, build viaduct, dedicated Lanes, pedestrian's street crossing overline bridge etc. from the space with conflicting wagon flow separately, this is restricted owing to reasons such as land occupations; The 2nd, build a series of traffic control device, as traffic signal controlling machine (being designated hereinafter simply as teleseme), road markings, traffic control center etc.,, improve the smoothness of traffic with the traffic environment of road improvement, alleviate congested traffic condition.Use traffic control device to obtain being extensive use of also of people and obtained certain achievement, show that teleseme can improve the service efficiency of road to greatest extent, guarantee the unimpeded effective control measure of urban road.

Theoretically, desirable traffic control system is based on the real-time traffic quantitative changeization, and the strategy of traffic control just is to take different traffic control methods along with the variation of the magnitude of traffic flow.Since adopting signal lamp that control is carried out in the crossing, the traffic expert is always just in the control of seeking the traffic flow in single crossing, whole piece circuit and whole zone, to realize the traffic flow in balanced whole zone, make traffic flow unimpeded, thereby make vehicle at the driving safety in whole zone, comfortable, unimpeded.More external developed countries drop into great amount of manpower and material resources to the research of traffic controlling machine, have obtained a series of achievements, and relatively success has TRANSYT (Britain), SCOOT (Britain), a SCAT (Australia).External urban traffic control system is not suitable for the national conditions of China.These several typical traffic control system softwares are all by external exploitation, and external urban transportation is formed and the urban transportation composition of China has very big difference.It does not fully take into account bicycle traffic stream of China and pedestrian's traffic flow (this mainly is because the national conditions of China cause).This just needs us to develop the traffic control system software that is fit to China's actual conditions.The deficiency of timing algorithm.TRANSYT is the offline optimization system, and it has very big deficiency in the application of reality.SCOOT and SCAT are online in real time Optimization Software systems.But it is exactly that the precision of algorithm is relatively poor based on mathematical model that there is a common limitation in these three systems.And in actual traffic control scene, all multifactor to having of traffic flow influence, adopting mathematical model itself is exactly being similar to field condition, the scene of these algorithms all is that the existing environment for use of external environment and China has very big difference, and what this had just caused algorithm itself just has certain defective.And that the traffic of China is formed is complicated, so build on several traffic control software of on the approximate model basis this system actual conditions of the urban transportation of incompatible China.

Domestic correlative study is started late, mainly contain: the XATM series intelligent traffic signal control system of Northwestern Polytechnical University's air traffic control Research Institute and exploitation, the ARGUS traffic signal control system of the Ying Teli of Shenzhen Information Technology Co., Ltd exploitation, the ML-TC04 traffic signaling equipment of Meilun Electroacoustic Co., Ltd., Hangzhou's exploitation, the 2000-1 intelligent traffic signal controller of Xinzhongxin electron stock Co., Ltd., Harbin city, the HSC-100 of Qingdao Hisense Network Technology Co., Ltd type teleseme etc.

Urban road transportation control mainly refers to the signal lamp control of intersection.Urban traffic signal control system is gone up from the time conflicting vehicle flowrate is separated, by traffic signaling equipment is set, traffic signals control mode and control model are set, different transport needs constantly give different right-of-ways to difference by timing, color matching to signal lamp, and conflicting wagon flow is separated.Chang Yong principle is to guarantee that vehicle is in the throughput maximum at crossing or the vehicle delay minimum at the crossing the most.

Use teleseme control traffic flow to be called traffic signals control, its objective is with the volume of traffic to adapt, with the interlaced traffic flow right-of-way of time score dispensing, to form unimpeded and Methodistic traffic flow.Traffic signals control has three basic parameters, i.e. Cycle Length (Cycle), split (Split) and phase differential (Offset).Control system is exactly by adjusting and determine the basic parameter value of each crossing on each wagon flow direction, reaching dredging and controlling traffic flow the best.

Along with the propelling of urbanization, urban traffic management is a hot issue, also need be with a large amount of traffic signal controlling machines.Though, the traffic control problem a lot of researchs have been carried out both at home and abroad, and on market, provide many moneys traffic signal controlling machine, but, can satisfy actual requirement and needs far away to the research of traffic administration and commercial traffic signal controlling machine along with the complicacy and the traffic efficiency of urban traffic constantly promotes.

Summary of the invention

What the purpose of this utility model provided a kind of GPRS of having network savvy is the novel traffic signal controller of core with DSP, and realizes the Wireless Networking management of urban traffic intersection signal controlling machine.

Controlling Traffic Signals in Urban Roads machine of the present utility model is made up of traffic signal controlling machine and traffic signal control system two parts, described traffic signal controlling machine is connected with standard radio connected network communication device GPRS module, light color signal circuit, described traffic signal control system is connected with the controller of all traffic intersections of city by standard radio connected network communication device GPRS module, is connected with the data center database again.

Described traffic signal controlling machine comprises dsp chip, the CPLD buffer chip, serial communication interface, the SRAM storer, the light color driving circuit, the keyboard drive circuit, liquid crystal display drive circuit and LCD display, wherein dsp chip respectively with the CPLD buffer chip, serial communication interface, the SRAM storer is connected with liquid crystal display drive circuit, CPLD buffer chip and colored lights driving circuit, the keyboard drive circuit connects, serial communication interface is connected with standard radio connected network communication device GPRS module, the colored lights driving circuit connects the traffic lights that lead to behind the light color signal circuit on the road, and the keyboard drive circuit connects operation keyboard.

Above-described dsp chip TMS320F2812 is the main control chip of traffic signal controlling machine, is the slave computer in the traffic signal control system, realizes the control of signal lamp and writing to each other by GPRS and host computer.

Above-described CPLD buffer chip is to realize and the connecting of high-speed dsp chip TMS 320 F 2812, and plays the buffer action of input and output.

Above-described serial communication interface is to realize connecting of dsp chip TMS320F2812 and GPRS module that the realization traffic signaling equipment is communicated by letter with GPRS's.

Above-described SRAM storer is the various controlling schemes of storage traffic signals control.

It is the driving circuit that drives traffic signals colored lights, external operation keyboard and LCDs respectively that above-described colored lights driving, keyboard drive, liquid crystal display drive, and realization dsp chip TMS320F2812 connects with traffic signals colored lights, external operation keyboard and LCDs.

Above-described LCD display is the various operations that are used to be presented at traffic signal controlling machine, current operating scheme, and and the host computer state of writing to each other and the data of transmission etc.

Above-described GPRS module is a standard radio connected network communication device, can realize the connection of communicating by letter with the internet, and realize traffic signaling equipment and traffic signal control system host computer write to each other communication scheme such as Fig. 2.

Above-described traffic signal control system is connected the controller of all traffic intersections of city by the GPRS network savvy, realizes Wireless Networking and monitoring management.

Characteristics of the present utility model are to adopt Single-chip Controlling mostly at existing traffic signaling equipment, function singleness occurs, the problem of poor reliability, and we adopt the kernel control chip of the DSP of TMS320C2000 series as traffic signaling equipment.On the basis of hardware, be programmed in program of lower computer and the host computer procedure that moves among the DSP then.Host computer procedure has an interface can be by the Long-distance Control of parameter realization to teleseme.For communication issue, after having compared existing various technology, the GPRS technology is adopted in decision, can satisfy the radio communication requirement of traffic signaling equipment fully.Propose " DSP of GPRS network savvy is the novel traffic signal controller of core ".

The utility model has the advantages that:

(1) using DSP is the main control chip of this traffic signal controlling machine, has realized single-point control easily, fixed cycle control, multi-period control, traffic responsive control, manually control, line traffic control function, functions such as yellow sudden strain of a muscle control, 8 phase places of may command meet the GA47--2002 standard at most.

(2) in outdoor application, can stand thunderstorm, hardships, can bear drench with rain, rugged surroundings such as High Temperature High Pressure, low-temp low-pressure, cold-starting, dust.

(3) utilize GPRS to realize the Wireless Networking of traffic signal controlling machine, can conveniently realize the centralized control of urban traffic signal, can monitor in real time and control each crossing controller by the Wireless Networking mode by control center;

(4) developed the traffic signaling equipment management software system of networking, can realize telemanagement and control, introduced database technology, be beneficial to scheme is carried out analysis optimization overall or local traffic signaling equipment based on GPRS.

Description of drawings

The structural drawing of Fig. 1 traffic signal controlling machine.

Fig. 2 is the GPRS communication scheme.

As shown in Figure 1, the dsp chip of traffic signal controlling machine is connected with liquid crystal display drive circuit with CPLD buffer chip, serial communication interface, SRAM memory respectively, the CPLD buffer chip is connected with colored lights drive circuit, keyboard drive circuit, serial communication interface is connected with standard radio connected network communication device GPRS module, the colored lights drive circuit connects the traffic lights that lead to behind the light color signal circuit on the road, and the keyboard drive circuit connects operation keyboard.

As shown in Figure 2, it is GPRS module and internet and traffic signal controlling machine, central database connection diagram, GPRS module one end is connected with central database by the internet, and the other end is connected to GPRS module and traffic signal controlling machine, realizes Wireless Networking and monitoring management.

Embodiment

It is the core of controller that the utility model can adopt the TMS320LF2407A (hereinafter to be referred as LF2407A) of TI company and the MAX II CPLD EPM570 of altera corp, DS1302 with U.S. DALLAS company is that traffic signal controlling machine system provides real-time clock, with having I ²Phase place, the operating scheme of the EEPROM device AT24LC16 storage traffic signal controlling machine of C interface, data such as timing timetable adopt eight road high voltages, and big electric current darlington transistor array ULN2803A is as the interface device of signal lamp.DSP TMS320LF2407A, this device is a 16 fixed-point DSP chip of high-performance that are applied to the field of controlling, the Harvard structure that inner employing program and data are separated, have special hardware multiplier, adopt multilevel pipelining, special DSP instruction is provided, realize that fast Fourier changes FFT and realizes various digital signal processing algorithms fast, have a large amount of peripheral hardware resources, as: A/D, timer, asynchronous serial port, WATCHDOG, CAN bus/PWM generator, Digital I pin etc.The kernal hardware circuit of controller system, adopt the power supply of 5V power supply, because the core voltage and the I/O mouth voltage of LF2407A chip all are 3.3V, so the supply voltage of 5V need be transformed to 3.3V, the TPS767D301 that adopts TI company in the system is as the DC/DC conversion chip, and this chip is the voltage regulator of a two-way low pressure drop, is input as 5V voltage, exportable one tunnel+3.3V fixed voltage and one road 1.5V～5V adjustable voltage, every road electric current maximum is output as 1A.Because the Flash program voltage is+5V in the LF2407A sheet, so ,+5V voltage directly can be inserted the Flash program voltage input pin Vccp of LF2407A by wire jumper.IS61LV6416L is adopted in the expansion of the outer program space of sheet, this chip is 64k * 16 high-speed cmos static RAM, minimum access time is 8ns, because when LF2407A is operated in 40MHz, its machine cycle is 25ns, so DSP need not add the stand-by period when it is visited, improve running efficiency of system.The design of CPLD mainly is to utilize CPLD that keyboard, liquid crystal and traffic lights are controlled.Because I/O pin and the various specific function of TMS320LF2407A are multiplexing, if keyboard, LCD shown and traffic lights are direct links to each other with DSP, this will cause its significant wastage, and keyboard and LCD are low-speed devices, this DSP that handles for high-speed data is unacceptable, so in the native system, adopt CPLD as keyboard, liquid crystal, the bridge of traffic lights.Show for LCD, data among the DSP are sent to CPLD, DSP does other thing then, and the task of follow-up demonstration is finished by CPLD, CPLD will operate on it under the speed that LCD allows can reach the demonstration purpose, CPLD is that port voltage is 3.3V, and the LCD interface voltage is 5V, for the level match between CPLD and the LCD, the mutual conversion between need finishing from 3.3V to 5V by level transferring chip, level transferring chip adopts the SN74LVC4245A chip of TI company, the data transfer direction of this chip is two-way, under the effect of pin DIR, both can realize changing to 5V from 3.3V, also can realize changing to 3.3V from 5V.For keyboard, by interrupting notifying DSP, the DSP operation of peeking then can't have influence on the travelling speed of total system like this in the various processing back of finishing keyboard.For traffic lights,,, and, reach the effect of the most traffic lights of a small amount of DSP port controlling by CPLD expansion I/O port if, can cause the waste of port all by the I/O port controlling of DSP because the quantity of signal lamp is more.In native system, the CPLD device adopts the MAX II device of altera corp.MAX II device is based on novel CPLD framework and based on 0.18 μ m Flash technology, has low-power consumption, core voltage is little, support the internal clocking frequency up to 300MHz, the non-volatile Flash storer of built-in user, real-time on-line system programmability (ISP) reduces the supply voltage kind, simplifies advantages such as single board design.In the traffic controller system, adopt MAX II series EPM570T144C5 chip, there are 570 logical blocks its inside, is equivalent to 440 macroelements, totally 116 general purpose I/O, the pin time-delay is 8.8ns.In native system, the real time clock circuit DS1302 of a kind of high-performance that employing U.S. DALLAS company releases, low-power consumption, band RAM, it can to year, month, day, Sunday, the time, minute, second carries out timing, has the leap year compensate function, operating voltage is 2.5V～5.5V.Adopt three-wire interface and CPU to carry out synchronous communication, have the function of the thin current charges of tiny stream.In native system, the ID of traffic controller number, the scheme of operation, phase parameter, the data such as timetable of operation period all are stored in EEPROM AT24LC16 the inside.

After the control signal of traffic lights is DSP output control signal process CPLD circuit decode, send into big electric current darlington transistor array ULN2803A, by ULN2803A control solid-state relay, solid-state relay links to each other with the traffic lights of 220v, to reach the effect of 3.3v Control of Voltage 220v traffic lights.ULN2803A is a high voltage, and the darlington transistor array of big electric current can drive 8 road signals.The solid-state relay reliable operation, life-span is long, noiseless, no-spark, no electromagnetic interference (EMI), switching speed is fast, and antijamming capability is strong, and volume is little, shock-resistant, anti-vibration, explosion-proof, moistureproof, anticorrosion, can with logical circuit compatibilities such as TTL, DTL, HTL, reach direct driving large current load with small control signal.

The serial port of system mainly is to be connected with the GPRS module, reaches the effect of Long-distance Control, adopts serial ports level transferring chip MAX232 as interface circuit.The GPRS module that adopts in the native system is the GPRS DTU of the general news science and technology in Jinan, this DTU itself has embedded system, CPU adopts 32 Philip ARM-7 processors, and operation real time operating system RTOS (Real Time Operation System), in conjunction with Siemens technical grade MC55 wireless communication module, configuration serial communication interface (RS-232/422/485), sim card socket and Power Management Unit, watchdog circuit, plate carries button cell and is used to keep real-time clock function (Real Time Stamp), and complete internet communication agreement: TCP/IP is provided simultaneously, UDP, FTP, SMTP, pop3, HTTP.Having possessed reaches the standard grade automatically by GPRS inserts the dial mechanism of internet and the login mechanism of reaching the standard grade automatically, can directly connect any terminal device that has serial line interface, finishes the transparent data transmission.

Claims

1. Controlling Traffic Signals in Urban Roads machine, it is characterized in that: form by traffic signal controlling machine and traffic signal control system, described traffic signal controlling machine is connected with standard radio connected network communication device GPRS module, light color signal circuit, described traffic signal control system is connected with the controller of all traffic intersections of city by standard radio connected network communication device GPRS module, is connected with the data center database again.

2. Controlling Traffic Signals in Urban Roads machine according to claim 1, it is characterized in that: described traffic signal controlling machine comprises dsp chip, the CPLD buffer chip, serial communication interface, the SRAM storer, the light color driving circuit, the keyboard drive circuit, liquid crystal display drive circuit and LCD display, wherein dsp chip respectively with the CPLD buffer chip, serial communication interface, the SRAM storer is connected with liquid crystal display drive circuit, CPLD buffer chip and colored lights driving circuit, the keyboard drive circuit connects, serial communication interface is connected with standard radio connected network communication device GPRS module, the colored lights driving circuit connects the traffic lights that lead to behind the light color signal circuit on the road, and the keyboard drive circuit connects operation keyboard.