KR20130026086A - Classifing system for vehicle's type using laser distance sensor - Google Patents

Abstract

PURPOSE: A vehicle discrimination device using a laser beam is provided to measure a tread of a vehicle by emitting a laser beam to be inclined in a driving direction of the vehicle. CONSTITUTION: A laser sensor box(LS) comprises two laser sensors(S1,S2). The two laser sensors respectively emit and receive a laser beam to be inclined in a driving direction of a road at the same angle. A control module(102) supplies a driving signal. A control module receives a signal reflected at vehicle wheels and inputted at the laser sensors. A speed calculation module(104) calculates the speed of a vehicle by dividing time intervals which respectively begins to reflect the laser beam. [Reference numerals] (102) Control module; (104) Speed calculation module; (106) Wheel width and wheelbase calculation module; (108) Vehicle type determination module; (110) Vehicle type data storage module

Description

Classifying system for vehicle's type using laser distance sensor}

The present invention relates to a vehicle type discrimination apparatus for measuring the lubrication and the wheel width of the vehicle by scanning the laser beams inclined in the driving direction.

Since tolls are charged differently according to the type of vehicle in a toll gate of a highway, the type of vehicle must be accurately determined. In addition, in order to accurately determine the type of the vehicle, the lubrication and the wheel width of the vehicle must be accurately measured in advance.

Patent application 10-2001-0062937 (name of the invention: a vehicle classification device using a laser sensor and a method thereof) (prior art 1) discloses a device for measuring lubrication and wheel width of a vehicle.

The prior art 1 is a switch unit which is disposed in the lower portion of the answer plate for transmitting the pressure by the wheel and having a predetermined number of switches to move down in accordance with the pressing of the answer plate; An answer plate assembly including a sensor unit measuring a distance by light reflected by a switch pressed by an answer pressure applied to the answer plate; Interface unit for relaying the signal measured in the plate assembly in the serial communication; A judging unit which receives the signal relayed from the interface unit and calculates the wheel width or roundness of the wheel to which the pressure is applied; It consists of a configuration including a control logic for generating a signal for controlling the plate assembly.

In the configuration of the related art 1, physical deformation is required by the vehicle weight, such as a switch unit having a predetermined number of switches moving downward in response to the pressing of the answer plate and the answer plate by the wheel. Since lubrication and lubrication width are measured by the deformation, the fatigue of the material is increased by the physical deformation, resulting in a short durability problem.

In addition, in view of these problems, patent application 10-2002-0018700 (name of the invention: a vehicle judgment system and method thereof) (hereinafter referred to as the prior art 2) has been developed.

The configuration of the related art 2 includes a vehicle detection laser sensor 110 that detects an entry of a vehicle by transmitting and receiving a laser beam, an axle count laser sensor 120 that detects the number of axles by transmitting and receiving a laser beam, and a rear image of the vehicle. CCD camera 130 to take a picture and, if the vehicle entry is detected, operates the CCD camera 130 to take a picture of the rear of the vehicle, and analyzes the rear image of the vehicle to calculate the wheeling and the wheel width of the vehicle, and then detects the number of the axles. With reference to refer to the vehicle type determination processor 140 to determine the type of the vehicle has a complicated configuration, and the equipment is manufactured at a high price, due to this complex system had a high failure rate problem.

The present invention is to solve the problems of the prior arts 1 and 2, the laser beam is inclined in the driving direction of the vehicle to measure the lubrication width of the vehicle by measuring the lubrication width of the vehicle, without the physical deformation, the production cost is low This is to accurately determine the type of vehicle.

Solution to Problem The present invention for solving the above problems is a laser box provided with two laser sensors (S1), (S2) for emitting and receiving the laser beams respectively inclined at the same inclination angle (θ) with respect to the driving direction of the road; A control module for supplying a driving signal for driving the laser sensors, receiving a signal received by the laser sensors reflected from the vehicle wheels traveling on the road, and a distance l1 at which two laser beams are spaced apart Includes a speed calculation module for calculating a speed V1 of the vehicle by dividing a time interval Δts that starts reflecting the laser beams, respectively.

In addition, in the present invention, it is preferable to further include a wheel width calculation module for calculating the lease of the vehicle by multiplying the speed V1 of the vehicle calculated by the speed calculation module with a time interval Δts and tan θ.

In addition, the present invention calculates the difference Δtq between the time t1 reflected from the front wheel of one side of the vehicle and the time t4 reflected from the rear wheel to the speed V1 of the vehicle calculated by the speed calculating module. Preferably, the multiplier calculation module further includes a multiplication calculation unit for calculating vehicle leaching.

According to the present invention having the above problems and solving means, the failure and the reading error rate consisting of two laser sensors for emitting a laser beam and a control unit for measuring the lubrication, the wheel width by analyzing their signals, low system cost Inexpensive vehicle identification device can be realized.

1 is a block diagram illustrating the present invention.
2 is a distance-time curve calculated by a vehicle passing through a laser sensor in the present invention.
Figure 3 is a geometric configuration diagram for obtaining the wheel width and lubrication of the vehicle according to the present invention.
4 is a block diagram of a vehicle type determining apparatus of the present invention.

1 is a block diagram illustrating the present invention.

On the road, the vehicle 1 is traveling in the direction of arrow P, the laser sensor box LS is installed on the roadside, and the laser sensors S1 and S2 are installed inside the sensor box LS. In the laser sensors S1 and S2, the interval L1 is maintained and the laser is emitted inclined with respect to the traveling direction. At this time, the height of the laser beam emitted is installed to a height that can be reflected from the wheel of the vehicle (1).

The front wheels (A) and (C) are located in the vehicle based on the driving direction, the rear wheels (B) and (D) are located, and the front wheels (A) and rear wheels (B) are located far from the sensor box (LS). , Front wheel (C) and rear wheel (D) is located closer to the sensor box (LS). When defining the inner side of the wheel near the sensor box LS and the outer side as the outer side of the wheels, a line extending the inside of the front wheel A in parallel with the driving direction is a, and the inner side of the front wheel C is the driving direction. C is defined as a line extending in parallel to the line, b is a line extending in the inside of the rear wheel B in parallel with the running direction, and a line is extended as the d extending the inside of the rear wheel D in parallel with the running direction.

The laser is emitted from the laser sensors S1 and S2, and the laser emitted from the laser sensor S2 is reflected inside the front wheel A of the vehicle when the vehicle 1 is traveling in the P direction. The reflected laser is received by the laser sensor S2 again, and the distance between the laser sensor S2 and the inside of the wheel A at the point when the laser is reflected from the wheel A is W1.

w1 = t / 2 C

 Is determined. Where t is the distance between the laser emission point and the reception point, and C is the speed of light.

In addition, when the laser is reflected from the front wheel (C), if the exit point and the reflection point of the reflected laser are known, the distance between the front wheel (C) and the laser sensors (S1) and (S2) can be known. The distance between the obtained laser sensors S1, S2 and the inside of the front wheel C is defined as w2.

In the same manner, the distance between the inside of the rear wheel B and the laser sensors S1 and S2 is defined as W3, and the distance between the inside of the rear wheel D and the laser sensors S1 and S2 is defined as w4.

Also, when the vehicle 1 passes while the laser beam is emitted from the laser sensors S1 and S2, the reflected waves reflected from the wheels are received and measured at the laser sensors S1 and S2. Will be.

2 is a distance-time curve calculated by a vehicle passing through a laser sensor in the present invention.

The graph of FIG. 2 (a) shows the distance of the wheel which is the reflector measured by the laser sensor S2 when the vehicle 1 travels in the P direction, and the graph of FIG. 2 (b) shows the vehicle 1 It shows the distance of the wheel which is a reflector measured by the laser sensor S1 when traveling in this P direction.

As shown in FIG. 2A, when the vehicle 1 travels in the P direction, the laser emitted from the laser sensor S2 is reflected from the wheel A at a time t1 to the laser sensor S2. The distance between the wheel A and the laser sensor S2 is calculated as w1. From time t2, the laser emitted from the laser sensor S2 is reflected by the wheel C and received by the laser sensor S2. In this case, the distance is calculated as W2. From the time t3 to the time t4, since the laser emitted from the laser sensor S2 is no longer reflected from the wheel, the distance of the reflector is not displayed, but the distance is reflected by the wheel B from the time t4 to the time t5. In this manner, the distance W4 due to the wheel D from the time t5 to the time t6 is calculated in the same manner.

In addition, as shown in FIG. 2 (b), a graph having the same pattern as that of FIG. 2 (a) but delayed by Δts = (t1 ′-t1) is formed by the laser sensor S1.

At this time, the speed V1 of the vehicle 1

Equation 1: V1 = ℓ1 / Δts = ℓ1 / (t1'-t1)

You can get it by

Since l1 is the distance between the lasers output from the laser sensor, and Δts is the time calculated from the graph, the vehicle speed v is calculated when these values are known.

Figure 3 is a geometric configuration diagram for obtaining the wheel width and lubrication of the vehicle according to the present invention.

As shown in FIG. 3, the laser emitted from the laser sensor S2 is received and reflected from the inside of the wheel A at time t1, and is received and reflected from the inside of the wheel B at time t1 ′. In addition, the interval between these two laser beams S2 (t1) and S2 (t1 ') is V1Δts = V1 (t1'-t1), so that the wheel width (L2) of the vehicle is

Equation 2: ℓ2 = tan θ * V1 * (t1'-t1)

Is determined. Θ is an angle between the laser beam and the traveling direction of the vehicle.

In addition, the laser beam reflected from the wheel (B) is required in order to obtain the car wheel l3. In FIG. 2, the laser beam of the laser sensor S2 at the vehicle wheel B is reflected at time t4, and the distance between the laser beam S2 (t4) and the laser beam S2 (t1) reflected at time t4 is rounded up (L3). )Because of,

Equation 3: l3 = V1 Δtq = V1 (t4- t1)

Is calculated.

The vehicle type discrimination apparatus as shown in FIG. 4 can be configured by the webbing and the webbing width of the vehicle calculated according to this principle.

4 is a block diagram of a vehicle type determining apparatus of the present invention.

The vehicle type discrimination apparatus of the present invention includes a laser sensor box (LS) having a laser sensor (S1), (S2) and the sensor box (LS) to emit two laser beams in parallel with the vehicle driving direction of the road inclined A control unit 101 which drives the laser sensors S1 and S2 and determines a vehicle type based on an input signal, and a conventional display device which displays or transmits the vehicle model read from the control unit 101 to the outside (not shown) C) and a transmission interface (not shown).

 The controller 101 is responsible for the OS of the controller 101, drives the laser sensors S1 and S2, and reflects from the wheels A, B, C, and D by passing through the vehicle. The signal received by the laser sensors S1 and S2 is received and processed, and the distances W1, W2, W3, and W4 from the wheels, which are reflectors, are processed by the signal processed signals. The control module 102 for calculating time data, the speed calculation module 104 for receiving the time-distance data calculated from the control module 102 and calculating the vehicle speed according to Equation 1, and the control module ( The wheel width weaving calculation module 108 which receives the time-distance data input from the speed 102 and the speed calculated from the speed calculation module 104 and calculates the roundness and the wheel width according to Equations 2 and 3, and the wheel width of each vehicle model, The wheel width, wheeler and car model day of the passing vehicle calculated by the vehicle model data storage module 110 and the wheel width calculation module 106 in which the wheel data is stored. Yunpok stored in the storage module 110, it comprises a model determination module 108 to determine the vehicle by comparing the tread having a yunpok, tread and the nearest of the data passed to the vehicle model of the passing vehicle.

The vehicle type discrimination apparatus configured as described above has a complex structure by analyzing the signals received from the lasers emitted by the laser sensors S1 and S2 to accurately measure the wheel width and roundness, and to clearly distinguish the vehicle by the measured round width and roundness. There is no need for facilities, and no need to analyze the camera's image, simplifying the system and reducing the error rate.

Claims (3)

A laser box provided with two laser sensors S1 and S2 for emitting and receiving laser beams inclined at the same inclination angle θ with respect to the driving direction of the road;
A control module for supplying a driving signal for driving the laser sensors, receiving a signal received by the laser sensors reflected from the vehicle wheels driving the road, and a distance l1 at which two laser beams are spaced apart And a speed calculating module for calculating a speed V1 of the vehicle by dividing a time interval Δts starting to reflect the laser beams, respectively. The vehicle type discrimination apparatus of claim 1, further comprising a wheel width calculation module configured to calculate a lease of the vehicle by multiplying the speed V1 of the vehicle calculated by the speed calculation module by a time interval Δts and tanθ. 2. The difference Δtq of the time t1 at which a specific laser beam is reflected from the front wheel of one side of the vehicle and the time t4 at the rear wheel is calculated by the speed V1 of the vehicle calculated by the speed calculating module. Vehicle type discrimination apparatus further comprises a multiplier calculation module for multiplying and calculating the lease of the vehicle.

Images