KR101353029B1 - Evaluation apparatus and method for a loop detector - Google Patents

Abstract

The present invention relates to an apparatus and a method for evaluating a loop detector with improved inspection efficiency, which can judge an operation state of a loop detector accurately and simply without an additional sample vehicle, by making a loop coil output a same loop coil signal as the signal when an actual sample vehicle passes through, even though the sample vehicle does not actually pass through, by artificially changing the inductance of the loop coil which is connected to a signal line between the loop coil and a controller constituting the loop detector which is a vehicle detection unit. [Reference numerals] (11) Inductance signal control part; (111) Oscillator; (113) Signal output unit; (13,320) Frequency determining unit; (14) Switch; (15) Switch driver; (17,330) Frequency detector; (19,340) Control unit; (310) Oscillator; (33) Loop coil 1; (33') Loop coil 2

Description

Apparatus and method for inspecting loop detectors with improved inspection efficiency

The present invention relates to an apparatus and method for inspecting a loop detector with improved inspection efficiency. Specifically, the inductance of a loop coil is connected to a signal line, which is a signal movement path between a loop coil and a controller constituting a loop detector as a vehicle sensing means. ) By artificially changing) so that the same loop coil signal is output from the roof coil even when the vehicle does not pass, so that the operation status of the loop detector can be determined accurately and simply without a separate sample vehicle. The present invention relates to an apparatus and method for inspecting loop detectors having improved efficiency.

The loop detector is a device that detects a vehicle entering a preset detection area. Specifically, the loop detector is composed of an equivalent circuit and is embedded in a road and is installed in a space separated from the vehicle driving direction, and a roof coil. After outputting the high-frequency signal to each of the loop coils received from the loop coils received from the controller to calculate the vehicle passage and vehicle speed based on the received loop coil signal, connected between the controller and the loop coil signal Consists of signal lines that provide a path to which is moved.

The loop detector configured as described above is inexpensive and simple to install compared to other vehicle detection means that detects a vehicle using an image and radar, and is not affected by changes in temperature, humidity, and sunlight. It is widely used in various places such as parking lots and toll gates.

In particular, the Intelligent Transport System (ITS), which collects traffic information such as traffic volume, vehicle speed, and vehicle density and provides collected traffic information to drivers based on the collected vehicle information, is popularized. As a result, the demand for loop detectors is increasing. In this case, the malfunction of the vehicle detection means in the intelligent transportation system not only causes traffic congestion but also can be directly connected to the complaints. Therefore, it is very important for the intelligent transportation system to prevent the malfunction of the vehicle detection means through periodic inspection. It is a problem.

However, the roof detector is easily damaged due to environmental factors such as impact, road damage, tire contact, and moisture caused by driving, depending on the installation characteristics embedded in the road, and it is more prone to failure than other vehicle detection means. Have

Therefore, the applicant of the present invention and other related companies periodically visit the site where the loop detector is installed and periodically check whether the loop detector is normally operated by using a known loop detector inspection equipment. In this case, the conventional loop detector inspection equipment is connected to a signal line connecting the controller and the loop coils, receives a loop coil signal output from the loop coils, detects the passage of the vehicle and the vehicle speed by itself, and then passes the vehicle detected by the controller. And receiving the vehicle speed data and determining an abnormal state of the loop detector when a difference value between the two data exceeds a preset threshold value.

However, the conventional loop detector inspection device does not have a separate means for artificially changing the inductance of the loop coil, so it waits until the actual vehicle passes through the roof coil and then inspects it based on the loop coil signal output from the loop coil. This creates a hassle for the manager to wait on site until the actual vehicle passes. In particular, the loop detector inspection work generally determines the malfunction of the loop detector based on 120 to 150 loop coil signals in order to increase the accuracy of the inspection. Therefore, the inspection time is further delayed and the inspection efficiency is lowered.

Therefore, it is urgent to study the loop detector inspection equipment that can accurately and simply check the state of the loop detector without using the actual vehicle as a sample.

1 is a plan view showing a test jig device described in Korean Patent No. 10-0981298 (name of the invention: loop detector test jig device).

The test jig device of FIG. 1 (hereinafter referred to as the prior art) 300 includes a main body frame 310 having a motor 311 at the center and a terminal block 313 connected to the controller 360 at one side thereof. The cover plate 320 covering the upper surface of the main body frame 310, one end portion is coupled to the shaft of the motor 311, the rotating means 330 is rotated around the motor shaft, and formed on both sides around the motor shaft The loop coil 340 is connected to the terminal block 313 of the frame 310 by the leader line 341, and a control unit 350 for controlling the driving of the motor 311.

In addition, in the related art 100, when the controller 360 is connected to the terminal block 313, a current is provided to the loop coil 340 by the controller, and an electromagnetic field is formed by the current provided by the loop coil. At this time, when the motor 311 is driven, as the rotating means 330 rotates, the electromagnetic field detection plate of the rotating means 330 passes through the loop coil 340, thereby changing the electromagnetic field.

Accordingly, the controller 360 detects the change of the electromagnetic field, that is, the change in inductance of the loop coil 340, and detects whether the vehicle passes. At this time, the electromagnetic field detecting plate sequentially passes through the plurality of loop coils. Receives a detection signal from the two loop coils with a time difference, calculates the vehicle speed by using the time of the received signal and the distance between the two loop coil days, the control unit 350 is calculated by itself and the controller 360 By comparing the speed calculated in the) it is determined whether the operation of the controller 360 is normal.

The prior art 300 configured as described above is provided with a rotation means for artificially displacing the inductance of the loop coil, so that the operation state of the loop detector can be determined even without using an actual sample vehicle, and thus the working time is delayed. It can overcome the problem of the conventional loop detector inspection equipment having low inspection efficiency.

However, the prior art 300 is not designed to determine the operating state of the loop detector already installed on the actual road at the installation site, but is designed to determine the operating state of the manufactured loop detector at the manufacturing site. When used for the purpose of determining the state of the loop detector, the work for separating the roof coil embedded in the road, and the operation for embedding the roof coil again on the road after the inspection, the problem is further reduced the inspection efficiency.

In other words, there is a need for a study of a loop detector inspection equipment that can provide a means for artificially displacing the inductance of the roof coil and can perform the inspection work without separating the roof coil embedded in the road.

The present invention is to solve this problem, the problem of the present invention by oscillating the inductance signal for displacing the inductance of the loop coil in the inductance signal oscillator and outputting the inductance of the loop coil artificially without the actual sample vehicle It is to provide a loop detector inspection apparatus and method that can significantly reduce the time required for inspection because of displacement.

In addition, another object of the present invention is to compare the vehicle speed calculated based on the preset vehicle speed and the loop coil signal to determine the state of the roof coil, and compare the preset vehicle speed and the vehicle speed input from the controller to The purpose of the present invention is to provide a loop detector test and method for determining a state by separating a loop coil and a controller by determining a state.

The solution means of the present invention for solving the above problems outputs a loop coil signal having a reference frequency when the vehicle does not pass, but outputs a loop coil signal having a correction frequency corresponding to the vehicle speed when the vehicle passes. And a loop detector checking device comprising a controller for calculating a vehicle speed by analyzing loop coil signals output from the loop coils, the method comprising: a frequency corresponding to a preset vehicle speed v in a roof coil An oscillator for oscillating an inductance signal for modifying the inductance value of the loop coil so that a loop coil signal having a; and an inductance signal oscillated in the oscillator are output to the loop coils at predetermined time intervals (t) An inductance adjusting unit including a signal output unit; A frequency detector which receives loop coil signals output from the loop coils and detects frequencies of the loop coil signals; After calculating the vehicle speed v 'based on the frequency detected by the frequency detector, a predetermined first set value whose difference between the vehicle speed v' and the preset vehicle speed v is a threshold value. It includes a control unit including a first determination unit for determining the state of the loop coil abnormally when (TH1: Threshold).

In addition, in the present invention, the control unit determines that the vehicle has passed when the difference value between the frequency detected by the frequency detector and the reference frequency exceeds a preset second set value (TH2: Threshold), the vehicle passing data Vehicle traffic determination module for detecting; A time difference calculating module for calculating a time difference t 'at the time point at which the vehicle passing data is detected from the respective loop coil signals output from the loop coils; The vehicle may further include a vehicle speed calculating module configured to calculate the vehicle speed v 'by dividing the time difference t' calculated by the time difference calculating module with a predetermined distance between the loop coils.

In addition, the present invention further comprises a communication interface for transmitting and receiving data with the controller, wherein the controller is a vehicle speed (v '') and the predetermined vehicle speed (calculated by the controller received from the controller received through the communication interface unit ( If the difference value of v) is greater than or equal to the first set value, it is preferable to separate the loop coils and the controller states by further including a second determination unit that determines that the state of the controller is abnormal.

In addition, in the present invention, the preset vehicle speed v is preferably received through input means provided according to a user's selection.

In addition, another solution of the present invention is a loop coil outputting a loop coil signal having a reference frequency when the vehicle does not pass, but outputs a loop coil signal having a correction frequency corresponding to the vehicle speed when the vehicle passes, and A loop detector checking apparatus for inspecting a loop detector comprising a controller that analyzes loop coil signals output from loop coils to determine whether a vehicle passes. A correction frequency f corresponding to a preset vehicle speed v in a loop coil. An oscillator for oscillating an inductance signal for modifying the inductance value of the loop coil so that a loop coil signal having?) Is output, and the inductance signal oscillated in the oscillator at predetermined time intervals (t) with the loop coils, respectively. An inductance adjusting unit including a signal outputting unit; A frequency detector configured to receive loop coil signals output from the loop coils and detect a frequency f ′ of the loop coil signals; After calculating the difference value? F between the frequency f 'detected by the frequency detector and the preset correction frequency f, the preset third set value TH3 in which the difference value? F is a threshold value. It is to include a control unit including a third determination unit for determining the state of the loop coil as abnormal when exceeding).

In addition, in the present invention, the preset vehicle speed v is preferably received through input means provided according to a user's selection.

In addition, another solution of the present invention is a loop coil outputting a loop coil signal having a reference frequency when the vehicle does not pass, but outputs a loop coil signal having a correction frequency corresponding to the vehicle speed when the vehicle passes, and A loop detector inspection method for inspecting a loop detector composed of a controller for calculating a vehicle speed by analyzing loop coil signals output from roof coils, the method comprising: passing a vehicle at a predetermined vehicle speed v through an inductance of the roof coil A signal oscillating step of oscillating an inductance signal which is a signal for transforming into an inductance value of a loop coil; An output step of outputting the inductance signal oscillated in the signal oscillation step to the loop coils at intervals of a predetermined time (t); An input step of receiving loop coil signals output from the loop coils; A speed calculation step of calculating a vehicle speed v 'based on the frequencies of the loop coil signals received in the input step; The state of the loop coil when the difference value between the vehicle speed v and the preset vehicle speed v calculated by the speed calculation step exceeds a first preset value TH1: Threshold. And a first determination step of determining abnormality.

In addition, in the present invention, the speed calculating step includes: a frequency detecting step of detecting frequencies of the loop coil signals received through the input step; Determining the vehicle passage data by determining that the vehicle has passed when the difference between the frequency detected by the frequency detecting step and the reference frequency exceeds a preset second set value TH2 (Threshold), which is a threshold value. step; A time difference calculating step of calculating a time difference t 'at the time point at which the vehicle passing data is detected from the respective loop coil signals output from the roof coils by the vehicle traffic determination step; The vehicle speed calculation step may further include calculating a vehicle speed v 'by dividing the time difference t' calculated by the time difference calculation step by the predetermined distance between the loop coils.

Also, in the present invention, the receiving step receives the vehicle speed v '' calculated by the controller from the controller after the first determination step, and the vehicle speed v 'received from the controller through the receiving step. ') And the second determination step of determining that the state of the controller is abnormal when the difference between the preset vehicle speed v is equal to or greater than the first set value, thereby separating the states of the loop coils and the controller. It is desirable to determine.

Further, in the present invention, it is preferable to further include an input step which is performed before the signal oscillation step and receives the preset vehicle speed v through the provided input means.

In addition, another solution of the present invention is a loop coil outputting a loop coil signal having a reference frequency when the vehicle does not pass, but outputs a loop coil signal having a correction frequency corresponding to the vehicle speed when the vehicle passes, and the loop A loop detector checking method for checking a loop detector comprising a controller for analyzing whether a vehicle passes by analyzing a loop coil signal output from a coil, the method comprising: a correction in which a loop coil signal of the roof coil corresponds to a preset vehicle speed v A signal oscillating step of oscillating an inductance signal, which is a signal for modifying an inductance value of the loop coil to have a frequency f; An output step of outputting the inductance signal oscillated in the signal oscillation step to the loop coil; An input step of receiving a loop coil signal output from the loop coil; A frequency detecting step of detecting a frequency f ′ of the loop coil signals received in the input step; Comparing the frequency f 'detected in the frequency detecting step with the correction frequency f to determine an abnormal state of the loop coil when a difference value between the two data is equal to or greater than a third set value TH3 which is a threshold value. And a third judgment step.

Further, in the present invention, it is preferable to further include an input step which is performed before the signal oscillation step and receives the preset vehicle speed v through the provided input means.

According to the present invention having the above-described problems and solutions, the inspection efficiency is increased as the work time is drastically reduced by artificially displacing the inductance of the loop coil without a separate sample vehicle.

In addition, according to the present invention, the installation time is reduced because the installation is performed by only a simple wiring operation to connect the signal line of the preset loop detector.

In addition, according to the present invention it is possible to accurately determine the state of each of the roof coils by detecting the vehicle passing data itself based on the frequency of the loop coil signal.

In addition, according to the present invention, by separating the loop coil and the controller to determine the status, not only the inspection accuracy is increased, but also when the failure occurs, only the failed equipment can be replaced separately to quickly respond to the failure.

1 is a plan view showing a test jig device described in Korean Patent No. 10-0981298 (name of the invention: loop detector test jig device).
2 is an exemplary view showing a loop detector inspection system to which an embodiment of the present invention is applied.
FIG. 3 is a circuit diagram illustrating the loop detector inspection system of FIG. 2.
4 is a circuit diagram illustrating a loop coil of FIG. 2.
5 is a block diagram illustrating the controller of FIG. 4.
6 is a flowchart for explaining an operation process of the loop detector checking apparatus according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described.

2 is an exemplary diagram illustrating a loop detector inspection system to which an embodiment of the present invention is applied, and FIG. 3 is a circuit diagram illustrating the loop detector inspection system of FIG. 2.

The loop detector inspection system 100 of FIG. 2 includes a first roof coil 33 and a second roof coil installed on a road R on which the vehicle C travels, and installed at intervals in a driving direction of the vehicle C. 33), and a high frequency signal is oscillated and output to the first and second loop coils 33 and 33 ', respectively, and a loop output from each of the first and second loop coils 33 and 33'. Connected to the controller 31 and the controller 31 and the first and second roof coils 33 and 33 'to detect whether the vehicle passes and the vehicle speed based on the loop coil signal received by receiving the coil signal. One embodiment of the present invention is connected to each of the signal lines 35 and 35 'and the signal lines 35 and 35' to check the loop coils 33, 33 'and the controller 31. It consists of a tow loop detector inspection apparatus (1).

The loop detector checking apparatus 1 is specifically designed to provide a loop coil signal output from the loop coils 33 and 33 'with a frequency corresponding to the preset vehicle speed v. 33 ') oscillates a signal (hereinafter referred to as an inductance signal) for artificially modifying the inductance value of the loop coil so that the inductance of the vehicle has an inductance value when the vehicle passes through the loop coils 33 and 33'. Will output

In addition, the loop detector checking apparatus 1 outputs the oscillated inductance signal to the first loop coil 33 and then outputs the inductance signal oscillated to the second loop coil 33 'when a predetermined time t elapses. . At this time, the time t is calculated by dividing the preset vehicle speed v by the separation distance d between the roof coils 33 and 33 ', and in the present invention, the preset vehicle speed v, time t ) And the separation distance (d) has been described as an example is stored, but these data (v), (t), (d) may be configured to be input by the administrator.

4 is a circuit diagram illustrating a loop coil of FIG. 2.

The loop coil 33 is composed of an equivalent circuit 70 as shown in FIG. 4 so that a high frequency signal input from the controller 31 has a frequency defined by Equation 1 below (hereinafter referred to as a loop coil signal). And then output it. At this time, referring to the loop coil signal with reference to Equation 1, it can be seen that the frequency is inversely proportional to the inductance (Ls) 71 value and the capacitor (Cp) 73 value.

Equation 1

That is, the loop coil 33 outputs a loop coil signal having a constant frequency (hereinafter referred to as a reference frequency) when the vehicle does not pass into the electromagnetic field formed by the coil, and when the vehicle passes into the electromagnetic field, the inductance ( Since Ls) 71 changes, a loop coil signal having an arbitrary frequency different from the reference frequency (hereinafter referred to as a correction frequency) is output.

In addition, the loop coil signals output from the loop coils 33 and 33 'are input to the controller 31 and the loop detector checking device 1 through the signal line 35.

The controller 31 oscillates the high frequency signal and outputs the oscillated high frequency signal to the first and second loop coils 33 and 33 ', and the frequency of the high frequency signal to be oscillated by the oscillator 310. The frequency determiner 320 to determine the frequency, the frequency detector 330 to detect the frequency of the loop coil signal received from the first and second loop coils 33 and 33 ', and the frequency detector 330 The controller 340 calculates and collects a vehicle detection and a vehicle speed based on the data detected by the controller. In this case, the high frequency signal is preferably about 50 to 150 KHz.

The loop detector 3 configured as described above has a frequency when the controller 31 does not pass the frequency of the loop coil signal output from each of the first and second loop coils 33 and 33 '. If the difference between the frequency of the loop coil signal and the reference frequency exceeds a predetermined threshold value, it is determined that the vehicle has passed through the loop coil 33, and if the frequency of the loop coil signal and the reference frequency When the difference is less than the threshold value, it is possible to collect various traffic information through a simple operation by determining that the vehicle has not passed through the roof coil 33.

The loop detector check apparatus 1 according to an embodiment of the present invention may include the signal lines 35 and 35 'connecting the controller 31 and the first and second loop coils 33 and 33', respectively. Is connected to.

The loop detector checking apparatus 1 stores and stores a vehicle speed v in advance and outputs an inductance value of the loop coil such that a loop coil signal having a correction frequency f corresponding to the vehicle speed v is output from the roof coil. Oscillates an inductance signal to modify At this time, the loop coils 33 and 33 'receive an inductance signal from the loop detector check device 1 and a high frequency signal from the controller 31 so that the inductance value is deformed and the vehicle preset by the loop detector check device 1 is set. A loop coil signal having a frequency corresponding to the speed v is outputted.

In addition, the loop detector checking device 1 outputs an inductance signal oscillated to the first loop coil 33 and outputs an inductance signal oscillated to the second loop coil 33 'when a predetermined time t elapses. . In this case, the preset time t may be calculated by dividing the separation distance between the roof coils 33 and 33 'by the preset vehicle speed v or may be preset and stored for each vehicle speed.

Referring to the loop detector check device 1 with reference to FIG. 3, the loop detector check device 1 oscillates in an oscillator 111 and an oscillator 111 for oscillating an inductance signal for modifying an inductance Ls value of a loop coil. An inductance adjusting unit 11 including a signal output unit 113 for sequentially outputting the inductance signal to the first loop coil 33 and the second loop coil 33 'at predetermined intervals of t; The frequency determining unit 13 determines the frequency, period, etc. of the inductance signal to be oscillated by the adjusting unit 11, and is connected to each of the signal lines 35 and 35 'and oscillated from the oscillator 111 when closed. A switch 14 for supplying an inductance signal to the first and second loop coils 33 and 33 ', a switch driver 15 for driving the switch 14, and first and second switches when the switch 14 is closed. The loop coil signals output from the second loop coils 33 and 33 'are input to analyze the loop coil signals. The vehicle speed v 'is calculated based on the frequency detector 17 detecting the frequency of the loop coil signal and the frequency data detected by the frequency detector 17, and the calculated vehicle speed v Compared to v), the control unit 19 determines the state of the loop coils 33 and 33 'as abnormal when the difference value between the two data is equal to or greater than the preset first set value TH1.

That is, the loop detector checking apparatus 1 artificially modifies the inductance Ls value of the equivalent circuit 70 so that the loop coil signal outputs a loop coil signal having a frequency corresponding to the preset vehicle speed v.

The control unit 19 is a CPU that manages and controls the control targets 11, 13, and 15 of the loop detector inspection apparatus 1.

In addition, the controller 19 receives frequency data from the frequency detector 17 and vehicle speed v 'data from the controller 31, and calculates the vehicle speed v' based on the received frequency data. When the vehicle speed v 'is compared to the preset vehicle speed v, if the difference between the vehicle speeds v and v' is greater than or equal to the first preset value TH1, the loop coil is abnormal. If the difference between the vehicle speeds v and v 'is less than the first set value TH1, the loop coil is determined to be normal. At this time, the operation of the speed calculation and status determination of the control unit 19 will be described in detail with reference to FIG.

The inductance signal adjusting unit 11 oscillates an inductance signal which is a signal for modifying the inductance Ls value of the loop coil so that the oscillator 111 has a frequency corresponding to the preset vehicle speed v.

The inductance signal oscillated by the oscillator 11 is the first and second loop coils 33 and 33 'together with the high frequency signal output from the controller 31 through the signal lines 35 and 35'. Is output.

When the first and second loop coils 33 and 33 'receive a high frequency signal and an inductance signal, the inductance value Ls is changed according to the input inductance signal so that the vehicle speed set by the loop detector check device 1 is preset. Outputs a loop coil signal having a frequency corresponding to

5 is a block diagram illustrating the controller of FIG. 4.

The controller 19 of FIG. 5 corresponds to a memory 192 in which data is stored, a communication interface module 193 supporting data communication with the controller 31, and a frequency detected by the frequency detector 17. The vehicle passage determination module 194 determining whether the roof coil passes through the vehicle and the first and second roof coils 33 and 33 'when the vehicle passage determination module 194 determines that the vehicle has passed. A time difference calculation module 195 for calculating a time difference between the times at which the correction frequency of the loop coil signal output from the detected time is detected, the time difference information calculated by the time difference calculation module 195, and the preset first and second loop coils 33. ) And a vehicle speed calculated by the vehicle speed calculating module 196 and a vehicle speed calculating module 196 calculating a vehicle speed v 'of the traveling vehicle by using the distance d information of the 33 and 33'. (v ') is compared to the preset vehicle speed (v), and the difference between the two data values is a threshold value. Through the first state determination module 197 and the communication interface module 193 which determine abnormally the states of the first and second loop coils 33 and 33 'when the first set value TH1 is equal to or greater than the set first TH. The controller 3 compares the vehicle speed (calculated by the controller) (v '') data input from the controller 31 with the preset vehicle speed v when the two data difference values are equal to or greater than the first set value TH1. The difference between the second state judging module 198 and the frequency f 'detected by the frequency detector 17 and the preset correction frequency f is determined as the third set value ( TH3) and the third state determination module 199 that determines the state of the loop coil abnormally, and the control targets 192, 193, 194, 195, 196, and 197. And a control module 191 for managing and controlling 198, 199.

In addition, the control unit 19 is connected to the inductance signal adjusting unit 11, the frequency determining unit 13, the switching driver 15 and the frequency detector 17, these connection objects (11), (13), (15), (17) manage and control.

The control module 191 is an operating system (O.S) of the control unit 19 and controls the control targets 192, 193, 194, 195, 196, and 197.

In addition, the control module 191 inputs the detected frequency data to the vehicle traffic determination module 194 when frequency data is detected from the frequency detector 17.

In addition, the control module 191 inputs the received loop coil signal to the time difference calculation module 195 when it is determined that the vehicle has passed by the vehicle traffic determination module 194.

In addition, the control module 191 inputs the time difference data calculated by the time difference calculation module 195 to the vehicle speed calculation module 196.

In addition, the control module 191 inputs the vehicle speed data calculated by the vehicle speed calculation module 196 into the first status determination module 197.

The memory 12 has a predetermined time difference Δt, a predetermined first set value TH1, a second set value TH2, and a separation distance between the first and second loop coils 33 and 33 ′. (d) is preset and stored.

In addition, the memory 12 stores predetermined signal information for each speed including a frequency and a period of the inductance signal according to the vehicle speed v.

In addition, the memory 12 stores and stores a reference frequency which is a frequency of the loop coil signal when the vehicle does not pass.

When the vehicle traffic determination module 194 receives the frequency data detected by the frequency detector 17 under the control of the control module 191, the vehicle traffic determination module 194 determines a difference value between the received frequency data and the reference frequency stored in the memory 12. Compare to the set value (TH2). In this case, the second set value TH2 is defined as a maximum difference value from a reference frequency that can be determined as a frequency of the loop coil signal when the vehicle does not pass.

In addition, the vehicle traffic determination module 194 determines that the vehicle does not pass through the roof coil if the input frequency is less than the second set value TH2. If the input frequency is greater than or equal to the second set value TH2, the roof coil It is determined that the vehicle has passed.

At this time, if it is determined that the vehicle has passed through the first and second loop coils 33 and 33 'by the vehicle traffic determination module 194, the control module 191 inputs the loop coil signal to the time difference calculation module 195. Let's do it.

The time difference calculating module 195 analyzes the loop coil signals input from each of the first and second loop coils 33 and 33 ′, and calculates a time point at which a correction frequency is detected.

In addition, the time difference calculation module 195 calculates a time difference Δt ′ at the time when the correction frequency of each of the loop coils is detected. At this time, the time difference Δt ′ calculated by the time difference calculating module 195 is input to the vehicle speed calculating module 196 under the control of the control module 191.

The vehicle speed calculating module 196 calculates the vehicle speed v 'by dividing the separation distance d stored in the memory 192 by the time difference Δt' calculated by the time difference calculating module 195. Vehicle speed v 'data is input to the first status determination module 197.

The first state determination module 197 determines the state of the loop detector by comparing the vehicle speed v ′ received from the vehicle speed calculation module 196 with a preset vehicle speed v.

In addition, the first state determination module 197 calculates a difference value Δv between the vehicle speed v and the vehicle speed v ′, and stores the calculated difference value Δv in the first memory 192. Compare to the set value (TH1).

In addition, the first state determination module 197 determines that the state of the loop detector 3 is normal when the speed difference value Δv is less than the first set value TH1, and the speed difference value Δv is the first. If the set value TH1 or more, the state of the loop coil 3 is determined to be abnormal.

The second status determination module 198 compares the vehicle speed (calculated by the controller) v ″ inputted from the controller 31 through the communication interface module 193 with the preset vehicle speed v. Determine the state of the loop detector.

In addition, the second state determination module 198 calculates a difference value Δv1 between the vehicle speed v and the vehicle speed v ″, and stores the calculated difference value Δv1 stored in the memory 192. 1 Compare with the set value (TH1).

In addition, the second state determination module 197 determines that the state of the controller 31 is normal when the speed difference value Δv1 is less than the first set value TH1, and the speed difference value Δv1 is set to the first state. If the value TH1 or more, the state of the controller 31 is determined to be abnormal.

The third state determination module 199 calculates the frequency difference value Δf of the two data by comparing the frequency f ′ detected by the frequency detector 17 with the preset correction frequency f. If the determined frequency difference value DELTA f is equal to or greater than the preset third set value TH3, the state of the loop coils 33 and 33 ′ is determined to be abnormal.

As described above, the loop detector inspection apparatus 1 according to the embodiment of the present invention artificially deforms the inductance Ls values of the first and second roof coils 33 and 33 'so that the first vehicle may not pass through the vehicle. By outputting the same loop coil signal as when the vehicle passes through the second roof coils 33 and 33 ', inspection time can be drastically reduced.

In addition, the loop detector inspection apparatus 1 is provided with the first and second loop coils 33 and 33 'without additional parts and work for changing the inductance of the first and second loop coils 33 and 33'. And the inductance can be deformed by simply connecting the signal line connected between the controller 31 and the controller 31, thereby facilitating the inspection procedure and manufacturing.

In addition, the loop detector checking apparatus 1 determines that the first state determination module 197 determines the state of the loop coil 33, and the second state determination module 198 determines the state of the controller 31 so that the loop and the controller The coils can be classified and the inspection can be performed.

6 is a flowchart for explaining an operation process of the loop detector checking apparatus according to an embodiment of the present invention.

The loop detector checking apparatus 1 includes a wiring step S10 for performing wiring work for connecting the controller 31 and the incoming signal lines and the outgoing signal lines of the first and second loop coils 33 and 33 ', and an inductance. Signal output step (S30) for outputting the inductance signal oscillation step (S20) and the inductance signal oscillated by the inductance signal oscillation step (S20) to the loop coil 33 through the signal line 35 and the loop Signal receiving step (S40) for receiving the loop coil signal output from the coil 33, frequency detection step (S50) for detecting the frequency of the loop coil signal received through the signal receiving step (S40), and frequency detection step A second preset setting of the frequency difference value calculating step S60 for calculating a difference value between the frequency detected by S50 and the preset reference frequency, and the frequency difference value calculated by the frequency difference value calculating step S60; The second frequency difference value is compared with the second value TH2. When the vehicle reaches the set value TH2 or more, the vehicle passes determination step (S70).

In addition, the loop detector checking apparatus 1 proceeds when it is determined that the vehicle has passed by the vehicle passage determining step S70, and analyzes the loop coil signals of each of the first and second loop coils 33 and 33 '. By calculating the time (t), (t ') when the correction frequency is detected by calculating the time difference (S80) and the time difference calculated by the time difference calculating step (S80) and the predetermined time difference A vehicle speed calculating step (S90) of calculating a vehicle speed using a separation distance, a speed receiving step (S100) of receiving vehicle speed v ′ data measured by the controller 31 from the controller 31, and a vehicle; After calculating the difference value between the vehicle speed (v) calculated in the speed calculating step (S90) and the vehicle speed (V) input through the speed receiving step (S100), the second set value (TH2) is set to the difference value. The comparison step (S110) for comparing whether or not the difference and the difference value in the comparison step (S110) is not less than the second set value (TH2) When the process proceeds when the abnormality determination step (S120) of determining the abnormal state of the loop detector and the difference value is less than the first set value (TH1) in the comparison step (S110) to determine the state of the loop detector as normal Returning to step 10 (S10), a normal determination step (S130) of performing the process after step 10 (S10) again.

1: loop detector inspection device 3: loop detector
11: inductance signal oscillator 13: frequency determination unit
14: switch 15: switch drive unit
17: frequency detector 19: controller 31: controller
33, 33 ': loop coil 35, 35': signal line
191: control module 192: memory 193: communication interface module 194: vehicle traffic determination module 195: time difference determination module
196: vehicle speed calculation module 197: status determination module

Claims (12)

Loop coils that output a loop coil signal having a reference frequency when the vehicle does not pass, and output a loop coil signal having a correction frequency corresponding to the vehicle speed when the vehicle passes, and loop coils output from the loop coils. In a loop detector check device for checking a loop detector comprising a controller that analyzes signals and calculates a vehicle speed:
An oscillator oscillating an inductance signal for modifying an inductance value of the loop coil so that a loop coil signal having a correction frequency f corresponding to a preset vehicle speed v is output from the roof coil; An inductance control unit including a signal output unit for outputting an inductance signal to the loop coils at predetermined time intervals (t);
A frequency detector configured to receive loop coil signals output from the loop coils and detect a frequency f ′ of the loop coil signals;
After calculating the vehicle speed v 'based on the frequency f' detected by the frequency detector, a preset value is a difference value between the vehicle speed v 'and the preset vehicle speed v. And a control unit including a first determination unit for determining an abnormal state of the loop coil when a first setting value (TH1: Threshold) is exceeded. The apparatus of claim 1,
Determining that the vehicle has passed when the difference between the frequency f 'detected by the frequency detector and the reference frequency exceeds a second preset threshold value TH2 (threshold value), the vehicle passing data being detected. A vehicle traffic determination module;
A time difference calculating module for calculating a time difference t 'at the time point at which the vehicle passing data is detected from the respective loop coil signals output from the loop coils;
And a vehicle speed calculating module configured to calculate the vehicle speed v 'by dividing the time difference t' calculated by the time difference calculating module with a predetermined separation distance of the loop coils. . The method of claim 1 or 2, further comprising a communication interface for transmitting and receiving data with the controller,
The control unit
If the difference between the vehicle speed v ″ and the preset vehicle speed v calculated by the controller received from the controller through the communication interface is greater than or equal to the first set value, the controller is determined to be in an abnormal state. And a second determination unit configured to separate and determine states of the loop coils and the controller. The loop detector checking apparatus according to claim 3, wherein the preset vehicle speed (v) is input through an input means provided according to a user's selection. Loop coils that output a loop coil signal having a reference frequency when the vehicle does not pass, and output a loop coil signal having a correction frequency corresponding to the vehicle speed when the vehicle passes, and loop coils output from the loop coils. In a loop detector check device for checking a loop detector composed of a controller analyzing signals to determine whether a vehicle has passed:
An oscillator oscillating an inductance signal for modifying an inductance value of the loop coil so that a loop coil signal having a correction frequency f corresponding to a preset vehicle speed v is output from the roof coil; An inductance control unit including a signal output unit for outputting an inductance signal to the loop coils at predetermined time intervals (t);
A frequency detector configured to receive loop coil signals output from the loop coils and detect a frequency f ′ of the loop coil signals;
After calculating the difference value? F between the frequency f 'detected by the frequency detector and the preset correction frequency f, the preset third set value TH3 in which the difference value? F is a threshold value. And a control unit including a third determining unit which determines the state of the loop coil as abnormal when exceeding a). The apparatus of claim 5, wherein the preset vehicle speed (v) is input through an input means provided according to a user's selection. Loop coils that output a loop coil signal having a reference frequency when the vehicle does not pass, and output a loop coil signal having a correction frequency corresponding to the vehicle speed when the vehicle passes, and loop coils output from the loop coils. In the loop detector checking method for checking a loop detector composed of a controller which analyzes signals and calculates a vehicle speed:
A signal oscillating step of oscillating an inductance signal which is a signal for transforming the inductance of the roof coil into an inductance value of the roof coil when the vehicle passes at a preset vehicle speed v;
An output step of outputting the inductance signal oscillated in the signal oscillation step to the loop coils at intervals of a predetermined time (t);
An input step of receiving loop coil signals output from the loop coils;
A speed calculation step of calculating a vehicle speed v 'based on the frequencies of the loop coil signals received in the input step;
When the difference value between the vehicle speed v and the preset vehicle speed v calculated by the speed calculation step exceeds a predetermined first set value TH1 (Threshold), which is a threshold value, the state of the loop coil is determined. And a first determining step of determining as abnormal. The method of claim 7, wherein the speed calculation step
A frequency detecting step of detecting a frequency of the loop coil signals received through the input step;
Determining the vehicle passage data by determining that the vehicle has passed when the difference between the frequency detected by the frequency detecting step and the reference frequency exceeds a preset second set value TH2 (Threshold), which is a threshold value. step;
A time difference calculating step of calculating a time difference t 'at the time point at which the vehicle passing data is detected from the respective loop coil signals output from the roof coils by the vehicle traffic determination step;
And a vehicle speed calculating step of calculating the vehicle speed v 'by dividing the time difference t' calculated by the time difference calculating step with a predetermined distance between the loop coils. . The vehicle speed input according to claim 7 or 8, further comprising a receiving step of receiving a vehicle speed v " calculated by the controller from the controller after the first determination step, and a vehicle speed input from the controller through the receiving step. and a second determination step of determining that the state of the controller is abnormal when the difference value between v " and the preset vehicle speed v is greater than or equal to the first set value. Loop detector check method, characterized in that by separating the states. The method as claimed in claim 9, further comprising an input step which is performed before the signal oscillation step and receives the preset vehicle speed v through the provided input means. The loop coil outputs a loop coil signal having a reference frequency when the vehicle does not pass, and outputs a loop coil signal having a correction frequency corresponding to the vehicle speed when the vehicle passes, and a loop coil signal output from the loop coil. In the loop detector inspection method for inspecting a loop detector composed of a controller for analyzing whether the vehicle passes by:
A signal oscillating step of oscillating an inductance signal which is a signal for modifying the inductance value of the roof coil so that the loop coil signal of the roof coil has a correction frequency f corresponding to a preset vehicle speed v;
An output step of outputting the inductance signal oscillated in the signal oscillation step to the loop coil;
An input step of receiving a loop coil signal output from the loop coil;
A frequency detecting step of detecting a frequency f ′ of the loop coil signals received in the input step;
Comparing the frequency f 'detected in the frequency detecting step with the correction frequency f to determine an abnormal state of the loop coil when a difference value between the two data is equal to or greater than a third set value TH3 which is a threshold value. And a third determination step. The method as claimed in claim 11, further comprising an input step which is performed before the signal oscillation step and receives the preset vehicle speed v through the provided input means.

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