CN204463430U - A kind of vehicle detection system based on PSD - Google Patents

Abstract

The utility model discloses a kind of vehicle detection system based on PSD, comprise data processing module, GPRS module, data memory module, it is characterized in that, also comprise PSD range finder module and traffic flow management platform; PSD range finder module, for obtaining obstacle distance, and sends the data to data processing module; Described PSD range finder module, at least to comprise 2 PSD array modules, is installed number and is directly proportional to the width of road.The assembling of this vehicle detection system is simple, is easy to operation, has highly application value and wide market outlook.

Description

A kind of vehicle detection system based on PSD

Technical field

the utility model relates to magnitude of traffic flow statistical technique field, is specifically related to a kind of vehicle detection system based on PSD.

Background technology

along with the develop rapidly of global economy and automobile industry, domestic automobile recoverable amount rises rapidly.While automobile brings convenience to us, also bring corresponding potential safety hazard to society, as the generation of traffic jam and traffic hazard.Extenuate traffic pressure and improve traffic administration, the key of traffic programme be set up and improve intelligent transportation system (Intelligent Transport System, be called for short ITS), by harmony, the close fit raising traffic transportation efficiency on people, car, road, relieving traffic jam, improve road network handling capacity, reduce traffic hazard.And the ITS of Erecting and improving, just accurately must grasp transport information, the detection of wherein traffic flow is one of important technology and information.

the metering system of vehicle detection system common at present has: ground induction coil, geomagnetic induction coil, acoustic sounding and video detection.Detecting by ground induction coil is the domestic method mainly taked, and its serviceable life is low, general one or two years, needs repeatedly to safeguard, costly; Geomagnetic induction coil detects, utilize vehicle by time magnetic field of the earth change detect, be difficult to differentiate the too little vehicle of longitudinal separation; Based on the detection method of sound wave detector, often can disturb, discrimination is lower; Video detection algorithm process is complicated, and can lose in intense traffic stream situation lower part wagon flow data.Application number is propose one " high-precision ultrasonic fixed traffic flow investigation equipment " in the patent of CN101833860A, although can effectively avoid sound wave between multilane mutually to disturb, improve accuracy of detection, but its be only limitted to be used in charge station by inspection track, be suitable for the Traffic flow detecting of middle low speed, the scope of application is narrower.

Summary of the invention

the utility model proposes a kind of vehicle detection system based on PSD, efficiently, reliably can not only detect traffic flow, and type of vehicle, wagon flow direction and car speed can be identified, carry out the intelligent monitoring of road traffic, vehicle supervision department can formulate reasonable policy accordingly, take proper measure, improve Road Network Capacity, make existing traffic infrastructure play maximum effect.

the technical solution of the utility model is: a kind of vehicle detection system based on PSD, comprises data processing module, GPRS module, data memory module, also comprises PSD range finder module and traffic flow management platform;

pSD range finder module, for obtaining obstacle distance, and sends the data to data processing module;

described PSD range finder module, at least to comprise 2 PSD array modules, is installed number and is directly proportional to the width of road.

further, the distance between described PSD range finder module is 500mm.

the utility model has the advantages that:

1. adopting based on the vehicle detection system of PSD in the utility model is utilize PSD range finder module to find range, the volume of the flow of passengers solution of multi-sensor cooperation, PSD linear array effectively can realize the collection of magnitude of traffic flow flow data, and can identify type of vehicle, wagon flow direction and car speed.Raising system carries out the accuracy of traffic flow identification, reliability, real-time and anti-interference, for the traffic programme of vehicle supervision department, scheduling, administrative skill provide practicable solution.

vehicle detection system assembling in the utility model is simple, is easy to operation, has highly application value and wide market outlook.

system is not subject to the impact of environmental factor, do not need video identification and complicated software algorithm, the accurate metering of high density wagon flow can be carried out, the statistics magnitude of traffic flow, the problem that transport solution flow counting is inaccurate, and increase the functions such as data wireless transmission, data analysis and back-stage management.Efficiently, reliably can not only detect traffic flow, and type of vehicle, wagon flow direction and car speed can be identified, carry out the intelligent monitoring of road traffic, vehicle supervision department can formulate reasonable policy accordingly, take proper measure, improve Road Network Capacity, make existing traffic infrastructure play maximum effect.

Accompanying drawing explanation

below in conjunction with drawings and Examples, the utility model is further described:

fig. 1 is the structured flowchart of a kind of vehicle detection system based on PSD in the utility model;

fig. 2 is the workflow diagram of a kind of vehicle detection system based on PSD in the utility model;

fig. 3 is the range measurement principle schematic diagram of PSD range finder module.

wherein: 1, semiconductor laser, 2, catoptron, 3, attachment lens, 4, optical transmitting system, 5, measured workpiece, 6, imaging optical system.

Embodiment

for making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with embodiment also with reference to accompanying drawing, the utility model is further described.Should be appreciated that, these describe just exemplary, and do not really want to limit scope of the present utility model.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present utility model.

embodiment:

below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described further.

a kind of vehicle detection system based on PSD utilizes the PSD range finder module be arranged on highway on end support to find range, according to systems axiol-ogy go out PSD find range from change curve judge the magnitude of traffic flow, then be considered as vehicle when distance shortens to pass through, and according to distance change size determination type of vehicle, differentiate direction of traffic by the mistiming of vehicle by front and back PSD range finder module and calculate the speed of a motor vehicle, finally surveyed traffic flow, type of vehicle, wagon flow direction and car speed Wireless transceiver best friend draft tube platform.

position-Sensitive Detector (Position-Sensitive Detector, be called for short PSD) be a kind of semiconductor devices based on lateral photo effect detection GuangDian Center location coordinate information, there is the advantages such as resolution is high, fast response time, signal transacting are simple, be specially adapted to unique, distance, angle and can indirect reformer be contactless high-precision Quick Measurement and the alignment measurement of other physical quantitys of optoelectronic position and displacement.

module is by PSD and IRED(infrared-emitting diode) and signal processing circuit three part form.Owing to have employed triangulation method, the material of testee, environment temperature and Measuring Time all can not affect the measuring accuracy of sensor.The distance of sensor output voltage value correspondence detection.The distance of institute's detecting object just can be drawn, so this sensor may be used for range observation, keeps away the occasions such as barrier by measuring voltage value.

module adopts laser triangulation principle, its principle of work is as shown in Fig. 3, the laser beam that semiconductor laser 1 sends is after catoptron 2, attachment lens 3 and optical transmitting system 4 focus on, the luminous point that upper formation size is enough little on the surface (tested surface) of measured workpiece 5, tested surface diffuses after imaging optical system 6, the photosurface of PSD forms a corresponding picture point.When tested surface is subjected to displacement change, the picture point on PSD also changes thereupon, sets up the mathematical model between measured object length variations, namely can be calculated the displacement H of object plane by the displacement of the luminous point on PSD exactly according to the picture point amount of movement of PSD.The computing formula of displacement is:

in formula: α is incident light and object plane angle; θ is incident light and optical axis included angle; S is object distance; S ' is image distance.

as shown in Figure 1, a kind of vehicle detection system based on PSD in the utility model comprises PSD range finder module, data processing module, GPRS module, data memory module, traffic flow management platform.

range finder module, obtains the distance of barrier apart from module, and sends the data to data processing module; Often overlap PSD range finder module and have several PSD array modules, the number of probes of installation site is directly proportional depending on the width of passage, and installation site is depending on the height of passage;

data processing module, Treatment Analysis is carried out to the data-signal that PSD range finder module collects, obtain barrier shape size, judge whether that vehicle passes through and determines type of vehicle, and differentiate direction of traffic according to the mistiming of front and back PSD range finder module and calculate the speed of a motor vehicle, then carry out traffic flow statistics, and the traffic flow information obtained is deposited to data memory module;

gPRS module, utilizes GPRS network that the traffic flow data of acquisition is sent to traffic flow management platform, and provides regularly transmission traffic flow statistics data and in real time transmission traffic flow statistics data two kinds of modes;

data memory module, comprises two parts data message, and wherein the traffic flow data information of a part for storing, to comprise in timing statistics, statistic processes the data such as the magnitude of traffic flow; The data message that another part PSD range finder module collects within certain time period;

traffic flow management platform, be responsible for the traffic flow data information of receiving system transmission and analyze, generate statistical information and form by different demand, and optional printing function is provided, for vehicle supervision department's policies, to take measures and strategic planning provides foundation.

first PSD range finder module selected in the present embodiment is described: PSD range finder module obtains the longest measuring distance must must reach 500cm, and differentiating type of vehicle with this is family-sized car or commercial truck.

the spacing between sensor and problem of the number before the workflow providing a kind of vehicle detection system based on PSD in the utility model, first solve the installation question of PSD range finder module, because directly can affect the accuracy of traffic flow statistics system.When two transducer spacings are too little, the data collected can be overlapped, when two transducer spacings are too large, the leakage collection of data can be caused again, for balancing this two problems, in conjunction with the height of each vehicle, through the checking of repeatedly installing and to test findings, distance in the present embodiment between selected PSD range finder module is 500mm, its number then look road width determine.

provide the workflow of a kind of vehicle detection system based on PSD in the utility model below, as shown in Figure 2:

1., for meeting the installation needs of different occasion, when traffic flow statistics system and device is installed, be rotatable 0-90 degree by the angle design between sensor and mounting bracket;

2. add up for the magnitude of traffic flow by certain vehicle detection system, first the change in coordinate axis direction used in following describing is defined: parallel with road and less with direct north angle direction is y-axis positive dirction, vertical with y-axis and be x-axis positive dirction along the right that y-axis forward is seen, by right-hand rule determination z-axis (for stating its physical significance, below be designated as t axle) positive dirction, the index value of often some representative sensor in x-axis, the t number of axle is according to representing the different moment, y-axis data are the distance value that each sensor measures, for being consistent with actual conditions, the crest place in figure (the actual trough place for range data) is made to represent vehicle location, definition y-axis positive dirction is downward, in fact, x-y data are the distance value that synchronization different sensors collects, and t-y data are the distance value that same sensor is not collecting in the same time, and x-t-y data are the range data that in certain time period, each PSD sensor collects,

4. considering that the situation that the magnitude of traffic flow is larger, the data processing in the present embodiment get 5s is a time period.After statistical system of traffic flow is started working, it is a time period with 5s, first filtering and interpolation processing are carried out to the x-t-y data collected in this time period, then 3 D image drawing is carried out, the crest place of three-dimensional picture just represents vehicle location, not only can draw through vehicle fleet size, the direct of travel of vehicle can also be judged according to the change of t-y data and curves, and pass through the mistiming according to the vehicle that longitudinally adjacent PSD sensor detects, under the prerequisite of known adjacent PSD sensor distance, calculate the average overall travel speed of vehicle;

5. pass through said method, the traffic flow statistics data of different directions in random time section can be drawn, deposit to data memory module by these data, the present embodiment chooses the mode regularly transmitting data, and traffic flow data is passed through the traffic flow management platform of GPRS Wireless transceiver to backstage by zero point every day;

6. in traffic flow management platform, can the data message such as real time inspection section road vehicle statistical information, according to demand traffic flow data can also be analyzed, generate printable statistical information and form, for vehicle scheduling and management provide foundation.

should be understood that, above-mentioned embodiment of the present utility model only for exemplary illustration or explain principle of the present utility model, and is not formed restriction of the present utility model.Therefore, any amendment made when not departing from spirit and scope of the present utility model, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.In addition, the utility model claims be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.

Claims (2)

1. based on a vehicle detection system of PSD, comprise data processing module, GPRS module, data memory module, it is characterized in that, also comprise PSD range finder module and traffic flow management platform;

pSD range finder module, for obtaining obstacle distance, and sends the data to data processing module;

described PSD range finder module, at least to comprise 2 PSD array modules, is installed number and is directly proportional to the width of road.

2. vehicle detection system based on PSD according to claim 1, is characterized in that, the distance between described PSD range finder module is 500mm.