UA121827C2 - SCANNING DEVICE FOR TRAFFIC CONTROL SYSTEMS AT THE CROSSROADS - Google Patents

Abstract

The scanning device for traffic light control systems at intersections belongs to traffic control systems (DR) and can be used in the development of an aggregate control system DR, ACS-DR, in information support systems for loading VDM intersections, as well as to improve traffic management. regulated intersections. The device includes a photodetector, which consists of sequentially located lens, slit aperture and collector, and the configuration of the aperture slit for each specific optical node of the photodetector is performed according to the trajectory of the laser beam on the surface of each lane at the entrance and exit intersection

Description

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Fig. 1 According to

The invention belongs to traffic control systems (TR) and can be used in the development of an aggregate system of DR controls, in the development of ACS-DR, in the information support systems for loading the VDM intersection, as well as to improve the efficiency of traffic management at regulated intersections.

This device can be used in systems for the simultaneous determination of the main parameters of traffic flows (TP): the moment of passage by the vehicle (13) of the controlled zone (KZ) and the intersection as a whole, speed, type and direction of traffic T3, their intensity of traffic in each lane any period of time, movement intervals between traffic lights, their delays, as well as the duration of the main elements of the traffic light regulation (SR) cycle.

In such systems, the duration of the elements and the traffic signal cycle are determined by scanning the area of the intersection with pointed laser beams from a point above its geometric center with a conical sweep, and the optical axis of the sweep is selected so that the beam describes a circle on the carriageway of the intersection in the necessary area of all its approaches (fig. 1).

The scanning device includes a laser emitter of a narrowly directed infrared beam, a scanning unit and a photoreceiver. The optical signal reflected from the TK (if there is a TK in the area of the beam) is captured by a photoreceiver (Patent Mo 112094 dated 07/25/2016, Bull. Mo 14/2016). This device is the closest to the claimed device and is therefore selected as the closest analogue.

The general disadvantage of such scanning devices is their low accuracy in determining the moment of collision of the vehicle on the scanning line, caused by the fact that the signal reflected from the smooth (almost mirror-like) surface of the car is difficult to distinguish, because it has a much smaller amplitude than that reflected from the road. In addition, even if this surface is not mirror-like, but rough, it may hardly differ in color from the road. The reflected signal will have the same amplitude and it will be almost impossible to distinguish the contour of the TK.

This leads to serious complications in the implementation of optimal control at regulated intersections of the transport network, as it requires the installation of a large number of detectors of different purposes and distant from each other, connected by a complex communication system, at the intersection. This reduces the reliability and accuracy of the output data coming in

From the management system.

The task of the invention is to increase the accuracy of scanning devices for traffic control systems at regulated intersections. This task is solved due to the schematic design of the scanning device. In fig. 2 shows a diagram that reveals the main distinguishing features of the proposed device.

The scanning device includes a scan unit 1 of a focused laser beam in the infrared range, a stationary photo receiver 2 and an optical unit consisting of a sequentially located lens 3, a slit diaphragm 4 and a collector 5.

According to the essence of the proposal, in the proposed scanning device, the scanning of the laser beam is carried out by the scanning node 1 (Fig. 2), which is located, for example, above the intersection. Depending on the height of its placement, the scanning axis is selected so that the laser beam describes a conical surface with a circle on the carriageway of the intersection, for example, in the area of the stop lines of all its approaches.

The optical system of the photo receiver is focused on the line created by the scanning laser beam on the road surface. It is important that a slit diaphragm 4 is installed in the focal plane of the optical unit, which transmits laser light only from this line. The surface of the road reflects light according to the law of diffusion, i.e. scattered in all directions. This guarantees signal reception for any point of the line.

The configuration of the diaphragm slit 4 for each specific optical unit of the photoreceiver 2 is performed according to the trajectory of the laser beam on the surface of each specific traffic lane at the entrance and exit of the intersection.

Thus, in the absence of TK in the plane of the scanning line of the laser beam, photo receiver 2 will perceive the maximum possible signal reflected from the road surface.

When a vehicle hits the scanning line (see fig. 1, 2), the point of reflection of the laser beam from the surface of the car will be higher (or lower, depending on the optical scheme of the lens) than the surface of the road, and therefore the reflected signal will not pass through the slit diaphragm.

It is this that significantly increases the accuracy of determining the moment when the vehicle hits the scanning line due to the improvement of the signal-to-noise ratio (the amplitude of the reflected from the mirror surface

TK does not participate in the formation of the information signal). In addition, the color of the road and vehicle will no longer affect the accuracy of further measurements.

Increasing the accuracy of determining the beginning and end of the intersection of the vehicle scanning line makes it possible to increase the accuracy of measuring the overall dimensions of vehicles, and subsequently the intervals and parameters of their movement, as well as other parameters that will contribute to increasing the efficiency of traffic management at regulated intersections.

Thus, the proposed scanning device makes it possible to increase the efficiency of the information support systems for loading regulated intersections

VDM due to the use of the specified scanning devices in their structure.

Claims (1)

FORMULA OF THE INVENTION A scanning device for traffic light control systems at an intersection, containing a laser emitter of a narrowly directed infrared beam, a scanning unit and a photoreceptor, which is distinguished by the fact that an optical unit is introduced into the device in front of the photoreceptor, which consists of a lens, a slit diaphragm and a collector located in series, with thus, the optical system of the photoreceptor is focused on the line formed by the scanning laser beam on the road surface, and the configuration of the diaphragm gap for each specific optical unit of the photoreceptor is performed according to the trajectory of the laser beam on the surface of each specific traffic lane at the entrance and exit of the intersection. vn i v s sy nin s s M OM SEWING OH MYPT SHITY ZIPY i "Y Ty Os g hm i OV MM MM ZMOV ZVO Fig 1 Explanation of the principle of operation of the scanning device for determining the main parameters of TP at the intersection of POM E MM K OV KVU xx х у PAK MN Z Z s MY PN M KK Х Х Х О Х х Х Х Х Х О Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Х Ч