KR20130115000A - Loop type vehicle detecting apparatus and method thereof - Google Patents

Abstract

PURPOSE: A loop type vehicle detecting device and a method thereof are provided to improve a calculation speed for a vehicle inspection and an accuracy of a vehicle detection result by selectively applying a discontinuous cycle. CONSTITUTION: A first oscillator (130) radiates a high frequency signal to a first loop sensor according to a first discontinuous oscillation control signal. A second oscillator (140) radiates a high frequency signal to a second loop sensor according to a second discontinuous oscillation control signal. A signal receiver (170) receives a vehicle detection signal from the first and second loop sensors. A signal collection control unit (180) prevents the frequency interference of the received vehicle detection signal by generating discontinuous oscillation control signals which are respectively set in the first and second loop sensors.

Description

LOOP TYPE VEHICLE DETECTING APPARATUS AND METHOD THEREOF

The present invention relates to a roof vehicle detecting apparatus and method.

The vehicle speed is applied to the entry loop sensor and the exit loop sensor embedded in the lane to detect the frequency change generated when passing the vehicle, and is detected through the time difference between the interval between the entry and exit loop sensors and the detected frequency change.

In the loop vehicle detecting apparatus, two loop detectors are buried or installed according to a traveling direction for each lane between road marking lines for displaying a driving position of the vehicle. In addition, two loop detectors are installed in each of the up and down lanes, and are connected to the loop detection apparatus by signal lead wires.

The previous loop type vehicle detection apparatus has a problem that frequency interference occurs between detection signals received from loop detectors in the loop detection apparatus, thereby lowering the accuracy of the vehicle detection result.

Korean Patent Publication No. 10-2006-0081013

In order to solve the above problems of the prior art, the present invention provides a loop type vehicle detecting apparatus and method for preventing frequency interference by oscillating frequency discontinuously.

The present invention also provides a loop type vehicle detecting apparatus and method for selectively applying a discontinuous period to improve the calculation speed for vehicle detection and the accuracy of the vehicle detection result.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood from the following description.

In order to achieve the above object, a loop vehicle detecting apparatus according to an aspect of the present invention, the first oscillator for oscillating a high frequency signal in accordance with a first discontinuous oscillation control signal to the first loop sensor installed in the lane, the first loop A second oscillator configured to oscillate a high frequency signal according to a second discontinuous oscillation control signal to a second loop sensor provided at a predetermined distance from the sensor; and detecting a vehicle detection signal from the first loop sensor and the second loop sensor when the vehicle enters the lane And a signal collection controller configured to generate a discontinuous oscillation control signal set in each of the signal receiver and the first loop sensor and the second loop sensor, thereby preventing frequency interference of the received vehicle detection signal.

According to another aspect of the present invention, a loop vehicle detecting method includes generating a plurality of discrete oscillation control signals having different frequency collection periods and oscillating a high frequency signal to each loop sensor, passing each loop sensor embedded in a lane. The method may include detecting a vehicle, converting a frequency reflecting a change in inductance of each loop sensor into a square wave signal, and generating vehicle detection result information by using each converted vehicle detection signal.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It is provided to fully inform the owner of the scope of the invention.

According to one of the above-described problem solving means of the present invention, the loop detecting vehicle detecting apparatus and method according to an embodiment of the present invention by oscillating the frequency discontinuously in accordance with the discontinuous oscillation control signal having a different frequency collection period frequency interference Can be prevented.

In addition, the roof-type vehicle detecting apparatus and method according to an embodiment of the present invention may selectively apply discontinuous periods to improve calculation speed for vehicle detection and to improve accuracy of vehicle detection results.

1 and 2 are block diagrams showing the configuration of a roof type vehicle detecting apparatus according to an embodiment of the present invention.
3 is a diagram illustrating a discontinuous oscillation control signal output from a signal collection control unit according to an embodiment of the present invention.
4 is a diagram illustrating a frequency discontinuously oscillated by the discontinuous oscillation control signal of FIG.
5 is a view showing a roof type vehicle detecting method according to an embodiment of the present invention.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are block diagrams showing the configuration of a roof type vehicle detecting apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a loop vehicle detecting system according to an exemplary embodiment of the present invention may include a first loop sensor 110, a second loop sensor 120, a third loop sensor 115, and a fourth loop sensor 125. ) And the vehicle detecting apparatus 200.

The first loop sensor 110 to the fourth loop sensor 140 detect movement of the vehicle. Here, the first loop sensor 110 and the third loop sensor 115 may serve as an entrance loop sensor for detecting a vehicle entering the vehicle detection section. The second loop sensor 120 and the fourth loop sensor 125 are buried apart by a predetermined distance from the first loop sensor 110 and the third loop sensor 115 for each lane, and the second loop sensor 120 is embedded. ) And the fourth loop sensor 125 may serve as an exit loop sensor for detecting a vehicle leaving the vehicle detection section.

The vehicle detecting apparatus 200 receives the vehicle detection signal of the discontinuous period by oscillating each of the discontinuous period high frequency signals to the first loop sensor 110 to the fourth loop sensor 140. The vehicle detecting apparatus 200 may generate vehicle detection result information by accurately detecting a vehicle without frequency interference by receiving each vehicle detection signal from the first loop sensor 110 to the fourth loop sensor 140.

2, the vehicle detecting apparatus 200 includes a first oscillator 130, a second oscillator 140, a third oscillator 135, a fourth oscillator 145, a first signal converter 150, The second signal converter 160, the third signal converter 155, the fourth signal converter 165, the signal receiver 170, the vehicle detector 175, the signal collection controller 180, and the input / output unit 185 ) And the storage 190.

The first oscillator 130 to the fourth oscillator 145 oscillate a high frequency signal of a discontinuous period set by the signal collection control unit 180 to correspond to each of the first loop sensor 110 to the fourth loop sensor 140. To provide. For example, the first oscillator 130 oscillates the frequency reflecting the change in inductance of the first loop sensor 110 according to the first discontinuous oscillation control signal.

Here, each of the first oscillator 130 to the fourth oscillator 145 receives a high frequency signal at a frequency interval of a value obtained by dividing a frequency band between a minimum oscillation frequency and a maximum oscillation frequency by the number of loop sensors embedded in each lane. It can rash. However, the first oscillator 130 to the fourth oscillator 145 may oscillate high frequency signals having different frequency values. For example, according to a frequency interval of 25 kHz divided by four loop sensors embedded in two lanes, a frequency band between a minimum oscillation frequency of about 100 kHz and a maximum oscillation frequency of about 200 kHz is about 125 kHz, The second oscillator 140 may oscillate a high frequency signal of about 150 kHz, the third oscillator 135 of about 175 kHz, and the fourth oscillator 145 of about 200 kHz. Meanwhile, the minimum oscillation frequency may be set to about 100 kHz and the maximum oscillation frequency may be set to about 200 kHz. This is because, in practice, it is difficult to detect a vehicle when the minimum oscillation frequency is set to a frequency below about 100 kHz, and the frequency of occurrence of frequency interference increases when the maximum oscillation frequency is set to a frequency above about 200 kHz.

The first signal converter 150 to the fourth signal converter 165 convert the oscillation frequency reflecting the change in inductance of the corresponding first loop sensor 110 to the fourth loop sensor 125 into a square wave signal.

The signal receiver 170 receives each of the converted square wave signals as a corresponding first vehicle detection signal to fourth vehicle detection signal. Here, the signal receiver 170 may detect the passage of the vehicle through the received first to fourth vehicle detection signals. The signal receiver 170 may include a plurality of signal receiving terminals that are electrically connected to each of the first signal converter 150 to the fourth signal converter 165. The signal receiver 170 receiving the discontinuous oscillation frequency will be further described with reference to FIG. 3.

The vehicle detection unit 175 generates at least one vehicle detection result information of vehicle speed information, vehicle number information, and vehicle type information. The vehicle detecting unit 175 calculates the speed of the vehicle for each lane. Here, the vehicle detection unit 175 may calculate the time difference between entry points of the vehicle entering the first loop sensor 110 and the third loop sensor 115 by receiving the first vehicle detection signal through the fourth vehicle detection signal. In addition, the vehicle detection unit 175 divides the distance between the first loop sensor 110 and the second loop sensor 120, the third loop sensor 115, and the fourth loop sensor 125 by the entry time difference, respectively. You can calculate the speed of your lane vehicle.

The signal collection controller 180 controls the discontinuous frequency oscillation of each of the first oscillator 130 to the fourth oscillator 145 to prevent mutual frequency interference. Here, the discontinuous frequency oscillation may be set by a discontinuous signal collection period set by using the input discontinuous period setting data. In more detail, the signal collection controller 180 may set the discontinuous signal collection period by using at least one of the length between the loop sensors installed in each lane, the maximum speed of the vehicle, and the minimum discontinuous detection number.

For example, the signal collection controller 180 may set a first discontinuous signal collection period as shown in Equation 1 below.

[Equation 1]

The first discontinuous signal collection period may be set to a value obtained by dividing the length between the loop sensors for each lane by the maximum speed of the vehicle and dividing it by the minimum discontinuous detection number again.

Here, the minimum discontinuity detection index may be calculated for each length of the loop sensor as shown in Table 1 after assuming that the maximum speed of the vehicle is 250 km / h (69.44 m / s) and the first discontinuous signal collection period is 2.5 ms. Here, the minimum discontinuity detection number is checked about 5 times when the length of the loop sensor is 1.0 m through Equation 1.

Distance between loops Sensor Pass Time Number of discrete detections Remarks 1.8m 25.9 ms 10.36 times Minimum discontinuity index 2.5m 36.0 ms 14.4 times 3.0m 43.2 ms 17.28

Then, the minimum discontinuous detection number is set to five times, and the first discontinuous signal collection period is calculated through Equation 1 as shown in Table 2 below.

Distance between loops Sensor Pass Time Discontinuous Cycle (T) Remarks 1.8m 25.9 ms 5.18 ms 2.5m 36.0 ms 8.06 ms 3.0m 43.2 ms 8.64 ms

Referring to Table 2, the first discontinuous signal collection period that satisfies the minimum discontinuous detection number 10 times under the condition that the loop sensor length is 1.8m may be set to 5.18ms.

The signal collection controller 180 may generate a discontinuous oscillation control signal for each loop sensor by applying a first discontinuous signal collection period.

According to another embodiment of the present invention, the signal collection controller 180 uses the minimum oscillation frequency and the maximum oscillation frequency of the first oscillator 130 to the fourth oscillator 145 and the second discontinuity using the minimum discontinuity detection index. You can set the signal collection period.

Here, the second discontinuous signal collection period is proportional to the minimum oscillation frequency and the minimum discontinuity of the first oscillator 130 and the second oscillator 140, and the maximum oscillation of the first oscillator 130 and the second oscillator 140. Can be inversely proportional to frequency.

&Quot; (2) "

According to Equation 2, the second discontinuous signal collection period may be set to a value obtained by dividing the minimum oscillation frequency of the loop sensor by the minimum discrete detection number divided by the maximum oscillation frequency of the loop sensor.

The signal collection controller 180 may generate a discontinuous oscillation control signal for each loop sensor by applying a second discontinuous signal collection period.

In addition, according to another embodiment of the present invention, the signal collection control unit 180 is applied to each loop sensor as a discontinuous signal collection period having a relatively short period by comparing the first discontinuous signal collection period and the second discontinuous signal collection period. Discontinuous oscillation control signal can be generated.

The input / output unit 185 inputs accurate vehicle detection data and commands, and outputs vehicle detection information. The input / output unit 185 may include a length between loop sensors for each lane, a maximum speed of a vehicle, a minimum number of discontinuous detections according to a vehicle detection, a minimum oscillation frequency and a maximum oscillation frequency of the first oscillator 130 to the fourth oscillator 145. Discontinuous period setting data including at least one is input. In addition, the input / output unit 185 outputs at least one vehicle detection result information among vehicle speed information, vehicle number information, and vehicle type information.

The storage unit 190 stores data and vehicle detection result information for operating the vehicle detection system.

3 is a diagram illustrating a discontinuous oscillation control signal output from a signal collection controller according to an embodiment of the present invention.

Here, a description will be given of the discontinuous oscillation control signal output from the signal collection controller on the assumption that four loop sensors are embedded in a two-lane road.

Referring to FIG. 3, the signal collection controller 180 may include a first discontinuous oscillation control signal S1, a second discontinuous oscillation control signal S2, and a third discontinuous oscillation control signal S3 at a set discontinuous signal collection period A. FIG. ) And a fourth discontinuous oscillation control signal S4. In this case, the signal collection control unit 180 divides the discontinuous signal collection period A by the number of loop sensors, thereby disposing the first discontinuous oscillation control signal S1, the second discontinuous oscillation control signal S2, and the third discontinuous oscillation control signal ( S3) and the frequency collection period B of the fourth discontinuous oscillation control signal S4 can be set. For example, since the number of loop sensors is four, when the discontinuous signal collection period A is set to 2.5 ms, the first discontinuous oscillation control signal S1, the second discontinuous oscillation control signal S2, and the third discontinuous oscillation The frequency collection period B of the control signal S3 and the fourth discontinuous oscillation control signal S4 may be set to about 625 kHz. Here, the signal collection control unit 180 may generate the first discontinuous oscillation control signal S1 and the second discontinuous oscillation control signal S2 such that the frequency collection period B is generated at different times in the discontinuous signal collection period A. FIG. The third discontinuous oscillation control signal S3 and the fourth discontinuous oscillation control signal S4 are generated. For example, the signal collection control unit 180 may control the second discontinuous oscillation control signal S2 to start the frequency collection period B at a time point when the frequency collection period B of the first discontinuous oscillation control signal S1 ends. Can be generated. In addition, the signal collection controller 180 may set the frequency collection period B in the same manner as the second discrete oscillation control signal S2 and the third discrete oscillation control signal S3 and the fourth discrete oscillation control signal S4. .

4 is a diagram illustrating a frequency discontinuously oscillated by the discontinuous oscillation control signal of FIG. 3.

Referring to FIG. 4, the signal receiver 170 receives frequencies discontinuously oscillated by the oscillator. Here, the signal receiver 170 transmits frequencies discontinuously oscillated in the plurality of oscillators connected to each of the four loop sensors through the first signal converter 150 to the fourth signal converter 165. To the fourth vehicle detection signal L4.

The signal receiver 170 may receive only one vehicle detection signal of the first vehicle detection signal L1 to the fourth vehicle detection signal L4 in the frequency collection period by the discontinuous oscillation control signal. Through this, the signal receiver 170 may receive the first vehicle detection signal L1 to the fourth vehicle detection signal L4 without frequency interference.

Through this, the loop type vehicle detecting apparatus according to an embodiment of the present invention can prevent frequency interference and improve the accuracy of the vehicle detection result by controlling the frequency collection period.

5 is a view showing a roof vehicle detecting method according to an embodiment of the present invention.

Referring to FIG. 5, in operation S510, the loop type vehicle detecting apparatus 200 generates a plurality of discrete oscillation control signals having different frequency collection periods and oscillates a high frequency signal to each loop sensor.

Here, the discontinuous oscillation control signal uses discrete period setting data including at least one of the distance between the loop sensors for each lane, the maximum speed of the vehicle, the minimum number of discontinuous detections according to the detection of the vehicle, the minimum oscillation frequency, and the maximum oscillation frequency. Can be set.

In operation S520, the roof type vehicle detecting apparatus 200 detects a vehicle passing by each loop sensor embedded in the lane. Here, the loop type vehicle detecting apparatus 200 generates a change in inductance of each of the loop sensors that receive the high frequency signal generated in the discontinuous period through the signal collection control unit 180.

In operation S530, the roof type vehicle detecting apparatus 200 converts the frequency reflecting the change in inductance of each loop sensor into a square wave signal.

In operation S540, the roof type vehicle detecting apparatus 200 generates vehicle detection result information by using each converted vehicle detection signal. The vehicle detection result information may be at least one of vehicle speed information, vehicle number information, and vehicle type information.

The loop vehicle detecting apparatus and method according to an embodiment of the present invention may oscillate frequencies discontinuously according to a discontinuous oscillation control signal having a different frequency collection period, thereby preventing frequency interference. In addition, the roof-type vehicle detecting apparatus and method according to an embodiment of the present invention may selectively apply discontinuous periods to improve calculation speed for vehicle detection and to improve accuracy of vehicle detection results.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

110: first loop sensor 115: third loop sensor
120: second loop sensor 125: fourth loop sensor
130: first oscillator 135: third oscillator
140: second oscillator 145: fourth oscillator
150: first signal converter 155: third signal converter
160: second signal converter 165: fourth signal converter
170: signal receiving unit 175: vehicle detecting unit
180: signal collection control unit 185: input / output unit
190: storage unit 200: vehicle detection device

Claims (13)

In a loop vehicle detecting device,
A first oscillator configured to oscillate a high frequency signal according to a first discontinuous oscillation control signal to a first loop sensor installed in a lane;
A second oscillator configured to oscillate a high frequency signal according to a second discontinuous oscillation control signal to a second loop sensor installed at a predetermined distance from the first loop sensor;
A signal receiver configured to receive a vehicle detection signal from the first loop sensor and the second loop sensor when the vehicle enters the lane; And
And a signal collection control unit generating a discrete oscillation control signal set in each of the first loop sensor and the second loop sensor to prevent frequency interference of the received vehicle detection signal.
The method according to claim 1,
Each of the first oscillator and the second oscillator oscillates a frequency in a frequency band of 100 kHz to 200 kHz.
The method according to claim 1,
At least one of a distance between the first loop sensor and the second loop sensor, a maximum speed of the vehicle, a minimum discontinuity detection number according to the vehicle detection, a minimum oscillation frequency and a maximum oscillation frequency of the first oscillator and the second oscillator; Loop type vehicle detection device further comprising an input and output unit for receiving a discontinuous period setting data including one.
The method according to claim 1,
The signal collection control unit
Set the discontinuous signal collection period by using the distance between the first loop sensor and the second loop sensor, the maximum speed of the vehicle and the minimum discontinuity detection number,
The discontinuous signal collection period is proportional to the distance between the first loop sensor and the second loop sensor, and inversely proportional to the maximum speed of the vehicle and the minimum number of discontinuous detection.
The method according to claim 1,
The signal collection control unit
The discontinuous signal collection period is set using the minimum oscillation frequency and the maximum oscillation frequency of the first oscillator and the second oscillator, and the minimum discontinuity detection number.
The discontinuous signal collection period is proportional to the minimum oscillation frequency and the minimum discontinuity detection number of the first oscillator and the second oscillator, and is inversely proportional to the maximum oscillation frequencies of the first oscillator and the second oscillator. Vehicle detection device.
The method of claim 1,
The signal collection control unit
A first discontinuous signal collection period set by a distance between the first loop sensor and the second loop sensor, a maximum speed of the vehicle, and a minimum discontinuous detection number for detecting the vehicle, and a minimum of the first oscillator and the second oscillator; The first discontinuous oscillation control signal and the second discontinuous oscillation control signal using a discontinuous signal collection period having a short period by comparing an oscillation frequency and a maximum oscillation frequency with a second discontinuous signal collection period set by the minimum discontinuous detection number. Loop type vehicle detection device, characterized in that for setting.
The method according to claim 1,
The first signal converter converts the frequency oscillated by the first oscillator into a square wave signal and outputs it to the signal receiver, and the second signal converts the frequency oscillated by the second oscillator into a square wave signal and outputs it to the signal receiver. Loop type vehicle detection apparatus further comprises a part.
The method according to claim 1,
And a vehicle detection unit configured to generate at least one vehicle detection result information among vehicle speed information, vehicle number information, and vehicle type information by using the vehicle detection signal.
In the loop vehicle detection method,
Generating a plurality of discrete oscillation control signals having different frequency collection periods to oscillate a high frequency signal to each loop sensor;
Detecting a vehicle passing by each loop sensor embedded in the lane;
Converting a frequency reflecting a change in inductance of each loop sensor into a square wave signal; And
And generating vehicle detection result information using each converted vehicle detection signal.
10. The method of claim 9,
In the step of oscillating the high frequency signal
Loop-type vehicle detection method characterized in that the oscillation frequency in the frequency band of 100kHz ~ 200kHz.
10. The method of claim 9,
The discontinuous signal collection period is between the first loop sensor and the second loop sensor using a distance between the first loop sensor and the second loop sensor, a maximum speed of the vehicle, and a minimum discontinuity detection number according to the vehicle detection. A loop type vehicle detection method, characterized in that it is set in inverse proportion to a maximum speed of said vehicle and said minimum discontinuity detection number.
10. The method of claim 9,
The discontinuous signal collection period may include the minimum oscillation frequency and the maximum oscillation frequency of the first oscillator and the second oscillator, and the minimum oscillation frequency of the first oscillator and the second oscillator by using the minimum discrete detection number according to the vehicle detection. And inversely proportional to the minimum oscillation frequency and inversely proportional to the maximum oscillation frequency of the first oscillator and the second oscillator.
10. The method of claim 9,
The discontinuous signal collection period
A first discontinuous signal collection period set by a distance between the first loop sensor and the second loop sensor, a maximum speed of the vehicle, and a minimum discontinuous detection number for detecting the vehicle, and a minimum of the first oscillator and the second oscillator; The first discontinuous oscillation control signal and the second discontinuous oscillation control signal using a discontinuous signal collection period having a short period by comparing an oscillation frequency and a maximum oscillation frequency with a second discontinuous signal collection period set by the minimum discontinuous detection number. Loop type vehicle detection method, characterized in that the setting.

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