JP2008102724A - Vehicle length measuring system and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle length measuring system and method that allow introducing a facility for automatically measuring the length of a vehicle without requiring large-scale remodeling work. <P>SOLUTION: The length of a vehicle 2 is measured through simple narrowband communication while using a first and a second wireless communication device 3, 4 for narrowband communication, installed in front of and behind a vehicle 2, respectively, a measuring-station-side wireless communication device 8 for narrowband communication, installed in a measuring station 7, and a computer 9, so as to automatically measure the length of the vehicle 2 without requiring large-scale remodeling work around the measuring station 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement in a vehicle length measurement system required for measuring the length of a vehicle, such as fee settlement by ETC, ferry boarding management, and the like.

  As a vehicle length measurement system and a vehicle length measurement method for automatically measuring the length of a vehicle, a vehicle length measurement system for ETC (ETC: Electronic Toll Collection) is known.

  Specifically, Patent Document 1 proposes a vehicle dimension measuring device in which a large number of photoelectric tube sensors are provided on both sides of a road surface and the length of the vehicle is measured based on time-series changes of the photoelectric tube sensors. Further, Patent Document 2 has already proposed a vehicle length measuring device that measures the length of a vehicle by combining an ultrasonic sensor and a Doppler radar.

  A length measuring device that detects the front end position of the vehicle when the rear end of the vehicle passes the reference position and identifies the length of the vehicle based on the distance from the front end position to the reference position. This is proposed as Patent Document 3.

  However, all of these conventional devices need to be equipped with photoelectric tube sensors, ultrasonic sensors, Doppler radars, laser sensors, etc. on the roadside, and in order to spread the system evenly to various measuring stations such as tollgates However, there is an inconvenience that a large-scale renovation work is required for each measuring station, which increases the cost of the entire project.

JP 2001-357488 A JP-A-6-288748 Japanese Patent Laid-Open No. 11-23250

  An object of the present invention is to improve the inconvenience of the prior art and to detect the vehicle length and the vehicle length measurement capable of introducing equipment for automatically measuring the length of the vehicle without performing a large-scale renovation work. It is to provide a method.

A vehicle length measurement system according to the present invention includes a first narrow-area communication wireless communication device provided at a front end portion of a vehicle, and a second short-range communication wireless communication device provided at a rear end portion of the vehicle. A speed detector mounted on the vehicle, the first and second narrowband communication wireless communication devices, an in-vehicle control device electrically connected to the speed detector, and the vicinity of the travel route of the vehicle A vehicle length measuring system comprising a measuring station-side narrow-area communication wireless communication device installed in a measuring station located at a measuring station and a computer connected to the measuring-station-side narrow-area communication wireless communication device. In particular, to achieve
In the in-vehicle control device, each of the first and second narrow area communication wireless communication devices is connected to the measurement station side narrow area communication when the vehicle approaches the measurement station side narrow area communication wireless communication apparatus. The value of the running speed detected by the speed detector at the time when communication with the wireless communication device for communication is possible is performed through the first and second narrow-area communication wireless communication devices in the measuring station side narrow-area communication. Providing a current speed transmitting means for transmitting to the wireless communication device for
The computer includes the vehicle based on a difference between a traveling speed value received from the first and second narrow area communication wireless communication devices and a reception time thereof by the measuring station side narrow area communication wireless communication device. The vehicle length calculating means for obtaining the length of the vehicle is provided.

In the above configuration, when a vehicle traveling along the travel route approaches the measurement station, first, the first narrow area communication wireless communication device provided at the front end of the vehicle and the measurement station side narrower installed at the measurement station. Wireless communication can be performed with the wireless communication device for regional communication.
The current speed transmission means of the in-vehicle controller is a vehicle speed detector at the time when wireless communication between the first narrow area communication wireless communication apparatus and the measuring station side narrow area communication wireless communication apparatus becomes possible. Is transmitted to the measuring station side narrow area communication wireless communication device via the first narrow area communication wireless communication device. Then, the computer connected to the wireless communication device for narrow station communication at the measuring station temporarily stores the value of the traveling speed and the reception time of the traveling speed, or temporarily stores the traveling speed value. Start measuring time.
Next, when the vehicle further travels along the travel route, a second narrow area communication wireless communication device arranged at the rear end of the vehicle and a measurement station side narrow area communication wireless communication device installed at the measurement station, Wireless communication between them.
The current speed transmission means of the in-vehicle controller is a vehicle speed detector at the time when wireless communication between the second narrow area communication wireless communication apparatus and the measuring station side narrow area communication wireless communication apparatus becomes possible. Is transmitted to the measuring station side narrow area communication wireless communication device via the second narrow area communication wireless communication device. Then, the computer connected to the wireless communication device for narrow station communication at the measuring station temporarily stores the value of the traveling speed and the reception time of the traveling speed, or temporarily stores the traveling speed value. End time measurement.
After that, the vehicle length calculation means of the computer uses the difference between the travel speed value received from the first and second narrow area communication wireless communication devices and the reception time thereof, that is, the second narrow area communication wireless communication. A value obtained by subtracting the time at which the traveling speed value transmitted by the first narrow area communication wireless communication apparatus is received from the time at which the traveling speed value transmitted by the apparatus is received, or the first narrow area communication wireless communication The length of the vehicle is obtained based on the elapsed time from the reception of the travel speed value transmitted by the device to the reception of the travel speed value transmitted by the second narrowband communication wireless communication device. Since the length is a value obtained by multiplying the speed by time, the average of the traveling speed values received from the first and second narrow area communication wireless communication devices is multiplied by the difference in the reception times or the measured value of the elapsed time. Alternatively, one of the traveling speeds received from the first and second narrow area communication wireless communication devices is a value representing the traveling speed, and a difference between the reception times or a measured value of the elapsed time is added to this value. It is calculated by multiplying.
As described above, the first and second wireless communication devices for narrow area communication, the speed detector and the vehicle-mounted control device arranged before and after the vehicle, and the wireless communication device for narrow area communication installed at the measuring station. And a simple configuration consisting of a computer and measures the length of the vehicle only through narrow-range communication, unlike photocell sensors, ultrasonic sensors, Doppler radars, laser sensors, etc. on the roadside Therefore, it is not necessary to carry out a large-scale renovation work around the measuring station, and the vehicle length measurement system introduction project required for automatically measuring the vehicle length can be achieved at a low cost.
Further, in recent years when electronic control of vehicles has become common, an engine that calculates a traveling speed by processing an output signal from a rotational speed detector such as a pulse coder, an F / V converter or a tachometer, or an output signal from the rotational speed detector. The control unit can be used as a speed detector, and furthermore, a car navigation system having a function as a speed detector can also be used as a speed detector. Therefore, there is no need to newly install a speed detector, and the cost burden on the user side who owns the vehicle is small.

Alternatively, when the first narrow area communication wireless communication apparatus becomes communicable with the measurement station side narrow area communication wireless communication apparatus when the vehicle approaches the measurement station side narrow area communication wireless communication apparatus. A process of sampling and temporarily storing the value of the traveling speed detected by the speed detector every predetermined period is started, and the second narrowband communication wireless communication device is the measurement station side narrowband communication wireless communication device. When the communication is possible, the temporarily stored travel speed value is collectively transmitted to the measuring station side narrow area communication wireless communication apparatus via the second narrow area communication wireless communication apparatus. A sampling rate transmission means is provided in the in-vehicle control device,
A computer for calculating vehicle length based on a traveling speed value and a sampling cycle received by the measuring station-side narrow-area communication wireless communication apparatus from the second narrow-area communication wireless communication apparatus. You may make it provide in.

In this case, after the communication between the first wireless communication device for narrow area communication and the wireless communication device for narrow area communication becomes possible, the second wireless communication apparatus for narrow area communication and the narrow area communication for measuring station side If the elapsed time until the communication with the wireless communication apparatus becomes possible is T ′ and the sampling period is Δt, [T ′ / Δt] = i (where i is an integer value) ) Sampling processing is executed.
That is, the travel speed V (1) at the time when communication between the first narrow-area communication wireless communication device and the measurement-station-side narrow-area communication wireless communication device becomes possible, the first narrow-range communication wireless communication device. Travel speed V (2) at the time when Δt has elapsed from the time when communication with the measuring station side narrow area communication wireless communication apparatus becomes possible, the first narrow area communication wireless communication apparatus and the measuring station side narrow Travel speed V (3) at the time when 2 · Δt has elapsed from the time when communication with the wireless communication device for regional communication becomes possible, and the second wireless communication device for narrow-area communication and the measuring station side I traveling speeds are extracted together with the traveling speed V (i) immediately before the communication with the wireless communication apparatus for narrow area communication becomes possible, and the second wireless communication apparatus for narrow area communication and the measuring station side are extracted. When communication with the wireless communication device for narrow area communication becomes possible, the sampling rate transmission means The individual traveling speeds are collectively transmitted from the second narrowband communication wireless communication device to the measurement station side narrowband communication wireless communication device.
The length of the vehicle is such that the communication between the first short-range communication wireless communication device and the measurement-station-side narrow communication wireless communication device is enabled, and then the second short-range communication wireless communication device and the measurement-station side. Since the traveling speed of the vehicle is integrated over time within the range of the elapsed time until the communication with the wireless communication device for narrow area communication, that is, the traveling time of the vehicle, the traveling speed during the sampling period Δt. Assuming that there is no fluctuation, the vehicle length calculation means of the computer calculates the equation [V (1) · Δt + V (2) · Δt + V (3) · Δt +,..., + V (i) · Δt]. Is executed to perform discrete integration processing, so that the length of the vehicle can be obtained approximately accurately.

  The above-described vehicle-mounted control device can be configured by an ETC vehicle-mounted terminal.

The ETC in-vehicle terminal has a configuration compatible with narrow-range communication, and has a built-in microprocessor for arithmetic processing, so this in-vehicle terminal and vehicle-side speed detector, that is, an engine control unit, a car navigation system, etc. If the microprocessor control program in the in-vehicle terminal is updated after providing an interface for connecting to the ETC, the ETC in-vehicle terminal can be used also as the in-vehicle control device of the vehicle length measurement system, and installed at the gate of the ETC The ETC-use narrow area communication wireless communication apparatus can also be used as the above-mentioned measuring station-side narrow area communication wireless communication apparatus.
Thus, the cost required for the introduction of the vehicle length measurement system can be further reduced by using the ETC in-vehicle terminal also as the vehicle-mounted control device of the vehicle length measurement system.

  Alternatively, instead of the above-described vehicle-mounted control device, the first and second narrow-area communication wireless communication devices may be moved by the vehicle approaching the measuring station-side narrow-area communication wireless communication device. The first and second narrow area communication wireless communication devices measure the value of the traveling speed detected by the speed detector when communication with the measurement station side narrow area communication wireless communication apparatus becomes possible. You may make it provide the present speed transmission means transmitted toward the radio | wireless communication apparatus for station side narrow area communication.

When such a configuration is applied, the first narrow-band communication wireless communication device and the measurement-station-side narrow-band communication wireless communication device become capable of wireless communication between the first narrow-band communication wireless communication device and the first narrow-band communication wireless communication device. The current speed transmission means of the wireless communication device for regional communication transmits the value of the traveling speed of the vehicle to the wireless communication device for narrow area communication via the first narrow communication wireless device, When the wireless communication between the second narrow-area communication wireless communication device and the measuring station-side narrow-area communication wireless communication device becomes possible, the current speed transmission of the second narrow-area communication wireless communication device The means transmits the value of the running speed of the vehicle to the measuring station side narrow area communication wireless communication apparatus via the second narrow area communication wireless communication apparatus.
The processing of the computer connected to the measuring station side narrow area communication wireless communication device is the same as described above.
A first and second narrowband communication wireless communication device and speed detector arranged before and after the vehicle, and a simple measuring station side narrowband communication wireless communication device and computer installed in the measurement station Because of this configuration, there is no need to carry out extensive renovation work around the measuring station, and as before, the project to introduce a vehicle length measurement system required to automatically measure the vehicle length is achieved at a low cost. The cost burden on the user side who owns the vehicle can be reduced.

Alternatively, when the vehicle approaches the measuring station side narrow area communication wireless communication device, the first narrow area communication wireless communication device can communicate with the measuring station side narrow area communication wireless communication device. A speed transmitting means for sampling the value of the traveling speed detected by the detector every predetermined period and transmitting it to the second narrowband communication wireless communication device is provided in the first narrowband communication wireless communication device,
The second narrow-area communication wireless communication device temporarily stores the traveling speed value transmitted from the first narrow-area communication wireless communication device in order, and the second narrow-area communication wireless communication device. Sampling speed at which the temporarily stored travel speed value is collectively transmitted to the measuring station-side narrow area communication wireless communication device when communication with the measuring station-side narrow area communication wireless communication apparatus becomes possible Providing transmission means,
A vehicle length calculation for obtaining a length of the vehicle based on a value of a traveling speed and a sampling cycle received from the second wireless communication device for narrow area communication by the measuring station side narrow area communication wireless communication device in a computer Means may be provided.

In this case, the travel speed V (1) at the time when communication between the first narrow-area communication wireless communication device and the measurement-station-side narrow-area communication wireless communication device becomes possible, the first narrow-area communication wireless communication. Travel speed V (2) at the time when Δt has passed since the communication between the apparatus and the measuring station side wireless communication apparatus for narrow area communication became possible, the first narrow area communication wireless communication apparatus and the measuring station side The traveling speed V (3) at the time when 2 · t has elapsed from the time when communication with the wireless communication device for narrow area communication becomes possible, and the second wireless communication device for narrow area communication and the measuring station I traveling speeds are extracted together with the traveling speed V (i) at the time immediately before the communication with the wireless communication device for narrow side communication becomes possible, and each time the second narrow area communication is performed by the speed transmitting means. Is transmitted to the wireless communication device.
The second wireless communication device for narrow-area communication temporarily stores these i traveling speeds sequentially, and communicates between the second wireless communication device for narrow-area communication and the wireless communication device for narrow-area communication on the measuring station side. At this point, the sampling speed transmitting means collectively transmits these i traveling speeds from the second narrow area communication wireless communication apparatus to the measurement station side narrow area communication wireless communication apparatus.
The length of the vehicle is such that the communication between the first short-range communication wireless communication device and the measurement-station-side narrow communication wireless communication device is enabled, and then the second short-range communication wireless communication device and the measurement-station side. Since the traveling speed of the vehicle is integrated over time within the range of elapsed time until the communication with the wireless communication device for narrow area communication, that is, the traveling time of the vehicle, the vehicle length calculation means of the computer, [V (1) · Δt + V (2) · Δt + V (3) · Δt +,..., + V (i) · Δt] to execute the discrete integration process, thereby calculating the length of the vehicle. Can be obtained almost accurately.

  In this case, the first and second wireless communication devices for narrow area communication can be configured by smart plates (electronic number plates) before and after the vehicle.

The smart plate was developed as part of the ITS (Intelligent Transport System) project and has a configuration compatible with narrow area communication like the ETC, and also has a built-in IC chip for communication. If an IC control program for the smart plate is updated after providing an interface for connecting the smart plate and the vehicle side speed detector, that is, an engine control unit, a car navigation system, etc., the ITS smart plate can be used in the vehicle length measurement system. It can be used as the first and second narrow-area communication wireless communication devices and the current speed transmission means or the speed transmission means, and is also a roadside narrow-area communication wireless communication apparatus (smart plate) corresponding to the narrow-area communication. And wireless communication equipment for narrow area communication) It can be also used as a line communication device.
Thus, the cost required for introducing the vehicle length measurement system by using the ITS smart plate as the first and second narrow area communication wireless communication devices and the current speed transmission means or the speed transmission means in the vehicle length measurement system. Can be further reduced.

  Further, the computer is connected to an ETC fee settlement terminal, the computer transmits the vehicle length calculated by the vehicle length calculation means to the fee settlement terminal, and the fee settlement terminal receives the The payment may be made based on the length of the vehicle.

  Since the vehicle length is actually measured by the vehicle length measurement system, the number information registered in the ETC in-vehicle terminal (information that is the range information described in the vehicle verification and includes the vehicle length) is incorrect or falsified. Even if there is, it is possible to accurately detect the length of the vehicle and perform fee settlement according to the length.

  Further, the computer is connected to a boarding management terminal for a ferry, the computer transmits the vehicle length calculated by the vehicle length calculation means to the boarding management terminal, and the boarding management terminal Correspondence mismatch between the length of the vehicle registered in advance in the boarding management terminal and the length of the vehicle received from the computer may be determined.

  Since the vehicle length is actually measured by the vehicle length measurement system, the vehicle length registered in advance in the boarding management terminal, that is, the length of the vehicle that the user reported when making a ferry reservation, was incorrect or false. Even in this case, it is possible to accurately detect the length of the vehicle and perform fee settlement according to the length.

  Also, two travel speed values detected by the speed detector when each of the first and second narrow area communication wireless communication apparatuses can communicate with the measuring station side narrow area communication wireless communication apparatus. If the vehicle length is calculated based on the vehicle length, the vehicle length calculation means receives the average of the traveling speed values received from the first and second narrow area communication wireless communication devices. It is desirable that the vehicle length is obtained by multiplying the difference.

  In the ETC gate, etc., the deceleration operation is often performed when the vehicle enters the gate, but the first narrow area communication wireless communication device located at the front end of the vehicle is the wireless communication for the measurement station side narrow area communication. Traveling speed when the device becomes communicable and traveling when the second narrow area communication wireless communication device located at the rear end of the vehicle becomes communicable with the measuring station side narrow area communication wireless communication device By calculating the average of the vehicle speed and multiplying this average by the difference in reception time, that is, the time required for the vehicle to travel a distance comparable to the vehicle length, the vehicle length can be determined approximately accurately. Is possible.

  Based on the two traveling speed values detected by the speed detector when each of the first and second narrow area communication wireless communication apparatuses becomes communicable with the measuring station side narrow area communication wireless communication apparatus. If the vehicle length is calculated, the travel speed value received from either one of the first and second narrowband communication wireless communication devices determined in advance is used instead of the aforementioned average. It is also possible to calculate the length of the vehicle by multiplying the difference in reception time.

  Under circumstances where no special acceleration / deceleration is performed, the traveling speed at which the first narrowband communication wireless communication device located at the front end of the vehicle becomes communicable with the measuring station-side narrowband communication wireless communication device. And the second narrow-area communication wireless communication device located at the rear end of the vehicle is the same as the traveling speed at the time when communication with the measurement-station-side narrow-area communication wireless communication device is possible. The vehicle speed can be obtained by multiplying this value by the difference in the reception time.

The vehicle length measurement method of the present invention is the measurement method when the first narrowband communication wireless communication device arranged at the front end of the vehicle enters the communicable range with the measurement station side narrowband communication wireless communication device. A computer connected to the wireless communication device for narrow area communication temporarily stores the value of the vehicle traveling speed and the reception time received by the local side wireless communication device for narrow area communication from the first wireless communication device for narrow area communication And
Further, when the second narrow area communication wireless communication device provided at the rear end of the vehicle enters the communicable range with the measurement station side narrow communication wireless communication apparatus, the measurement station side narrow area After the computer temporarily stores the value of the vehicle traveling speed and the reception time received by the wireless communication device for communication from the second wireless communication device for narrow area communication,
A configuration in which the computer calculates a difference between an average of traveling speed values temporarily stored in the computer and a reception time, and obtains a vehicle length by multiplying the average by the difference in reception time. Have.

The length of the vehicle by a simple configuration comprising the first and second narrow-area communication wireless communication devices deployed before and after the vehicle, the measurement-station-side narrow-area communication wireless communication device and a computer installed at the measurement station. Therefore, unlike the case where phototube sensors, ultrasonic sensors, Doppler radars, laser sensors, etc. are arranged on the roadside, there is no need to perform extensive renovation work around the measuring station.
In addition, the travel speed at the time when the first narrow-area communication wireless communication device located at the front end of the vehicle becomes communicable with the measurement-station-side narrow-area communication wireless communication device and the first short-range communication wireless communication device located at the rear end of the vehicle. The second wireless communication device for narrow area communication is averaged with the traveling speed at the time when the wireless communication device for narrow area communication becomes communicable with the measuring station side. Since the vehicle length is calculated by multiplying the time required to travel a comparable distance, when the vehicle is decelerating or accelerating when measuring the vehicle length Even if it exists, the length of a vehicle can be calculated | required substantially correctly.

  Alternatively, instead of the above-mentioned average, the length of the vehicle can be calculated by multiplying the value of the traveling speed received from any one of the first and second narrow area communication wireless communication devices by the difference in the reception time. May be requested.

  Under circumstances where no special acceleration / deceleration is performed, the traveling speed at which the first narrowband communication wireless communication device located at the front end of the vehicle becomes communicable with the measuring station-side narrowband communication wireless communication device. And the second narrow-area communication wireless communication device located at the rear end of the vehicle is the same as the traveling speed at the time when communication with the measurement-station-side narrow-area communication wireless communication device is possible. The vehicle length can be obtained based on the difference between the traveling speed and the reception time.

In addition, instead of temporarily storing in the computer the reception time when the value of the vehicle traveling speed is received from the first and second narrow area communication wireless communication devices,
The elapsed time from when the vehicle travel speed value is received from the first narrow-area communication wireless communication device until the vehicle travel speed value is received from the second narrow-area communication wireless communication device. The computer measures,
It is also possible to obtain the length of the vehicle by using this elapsed time instead of the difference in the reception time.

  The difference in reception time and the elapsed time are essentially the same.

Alternatively, the travel detected by the speed detector when the first narrow-area communication wireless communication device deployed at the front end of the vehicle enters the communicable range with the measurement-station-side narrow communication wireless communication device. Sampling the value of the speed at predetermined intervals and temporarily storing it in the first narrow area communication wireless communication device or the second narrow area communication wireless communication device arranged at the rear end of the vehicle,
When the second narrow area communication wireless communication apparatus becomes communicable with the measuring station side narrow area communication wireless communication apparatus, the temporarily stored travel speed value is used as the second narrow area communication wireless communication apparatus. Transmit collectively to the wireless communication device for narrow area communication through the communication device,
The computer connected to the wireless communication device for narrow area communication performs discrete integration processing based on the value of the traveling speed and the sampling period received from the second wireless communication device for narrow area communication, and It is good also as composition which asks for length.

In this case, the travel speed V (1) at the time when communication between the first narrow-area communication wireless communication device and the measurement-station-side narrow-area communication wireless communication device becomes possible, the first narrow-area communication wireless communication. Travel speed V (2) at the time when Δt has passed since the communication between the apparatus and the measuring station side wireless communication apparatus for narrow area communication became possible, the first narrow area communication wireless communication apparatus and the measuring station side The traveling speed V (3) at the time when 2 · t has elapsed from the time when communication with the wireless communication device for narrow area communication becomes possible, and the second wireless communication device for narrow area communication and the measuring station The i traveling speeds are extracted together with the traveling speed V (i) at the time immediately before the communication with the side narrow area communication wireless communication apparatus becomes possible, and the second narrow area communication wireless communication apparatus and the measuring station are extracted. At the time when communication with the wireless communication device for narrow side communication becomes possible, these i traveling speeds are combined into the second It is transmitted from the wireless communication apparatus for narrow area communication toward the wireless communication apparatus for narrow area communication on the measuring station side.
The length of the vehicle is such that the communication between the first short-range communication wireless communication device and the measurement-station-side narrow communication wireless communication device is enabled, and then the second short-range communication wireless communication device and the measurement-station side. Since the traveling speed of the vehicle is integrated over time within the range of elapsed time until the communication with the wireless communication device for narrow area communication, that is, the traveling time of the vehicle, the vehicle length calculation means of the computer, [V (1) · Δt + V (2) · Δt + V (3) · Δt +,..., + V (i) · Δt] to execute the discrete integration process, thereby calculating the length of the vehicle. Can be obtained almost accurately.

  The vehicle length measurement system and the vehicle length measurement method of the present invention include first and second wireless communication devices for narrow area communication installed before and after a vehicle and wireless communication for narrow area communication installed at a measurement station. Since the length of the vehicle can be measured by simple narrow-area communication using a device and a computer, the measuring station is different from the case where phototube sensors, ultrasonic sensors, Doppler radars, laser sensors, etc. are installed on the roadside. It is not necessary to carry out a large-scale renovation work around the vehicle, and a vehicle length measurement system introduction project required for automatically measuring the vehicle length can be achieved at low cost.

  In addition, with regard to the current speed transmission means and the radio communication apparatus for narrow area communication that constitute the main part of the system, the ETC in-vehicle terminal that is already widely used and the ETC narrow band installed at the ETC gate are already used. It is possible to build a wireless communication device for regional communication, or a smart plate that is expected to be used in the future, or a roadside wireless communication device that performs narrow-area communication with the smart plate as a platform. Can be further reduced.

  Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a conceptual diagram showing the configuration of a vehicle length measurement system according to an embodiment to which the present invention is applied.

  The vehicle length measurement system 1 of this embodiment is schematically shown as a first narrow-area communication wireless communication device 3 provided at the front end of the vehicle 2 and a second narrow communication device provided at the rear end of the vehicle 2. The area communication wireless communication device 4 and the speed detector 5 mounted on the vehicle 2 (see FIG. 2), and the first and second narrow area communication wireless communication devices 3 and 4 and the speed detector 5 are electrically connected. Connected vehicle-mounted control device 6, measurement-station-side narrow-area communication wireless communication device 8 installed in measurement station 7 located in the vicinity of travel route X of vehicle 2, and measurement-station-side narrow-area communication wireless The computer 9 is connected to the communication device 8.

  In this embodiment, the in-vehicle control device 6 is configured by using an ETC in-vehicle terminal, and the ETC narrow-area communication wireless communication device installed at the ETC gate is used as the measuring-station-side narrow-area communication wireless communication device 8. A gate control terminal used for ETC gate bar opening / closing control and the like is used as the computer 9.

  The first wireless communication device 3 for narrow area communication is mounted in the vicinity of the front number plate of the vehicle 2 and is connected to an in-vehicle control device 6 composed of an ETC in-vehicle terminal via an interface 3a. The second narrow area communication wireless communication device 4 is mounted in the vicinity of the rear number plate of the vehicle 2 and is connected to the in-vehicle control device 6 via the interface 4a.

  Further, an ETC fee settlement terminal 10 is connected to a computer 9 comprising a gate control terminal via a local network or a dedicated line.

  FIG. 2 is a functional block diagram showing a simplified connection relationship between the first and second narrowband communication wireless communication devices 3 and 4 mounted on the vehicle 2 side, the speed detector 5 and the in-vehicle control device 6. .

  The speed detector 5 in this embodiment is originally provided for engine control and shift control in the vehicle 2, and is a throttle opening sensor 11 that detects the opening of the throttle and an engine rotation that detects the crank speed. Along with the sensor 12 and a shift position detection sensor 13 for detecting the position of the shift lever, it is connected to the engine control unit 15 via an input / output circuit 14. The main part of the speed detector 5 is composed of a pulse coder, an F / V converter or a tachometer provided on a power transmission system linked with the rotation of the wheel, and a signal on the side of the engine control unit 15 provided with the microprocessor 17. By processing, the traveling speed of the vehicle 2 is obtained in real time. Therefore, strictly speaking, the speed detector 5 is obtained by adding a signal processing circuit on the engine control unit 15 side to these pulse coder, F / V converter, tachometer generator, and the like.

  The in-vehicle control device 6, which is an ETC in-vehicle terminal, is provided with an interface 6 a for connecting to the engine control unit 15, and the microprocessor 16 of the in-vehicle control device 6 is connected to the engine control unit 15 via this interface 6 a. The traveling speed of the vehicle 2 can be read in real time.

  Here, as an example, the description has been given of the case where the in-vehicle control device 6 recognizes the traveling speed of the vehicle 2 using the speed detector 5 for engine control and shift control. In the case of a vehicle 2 equipped with a car navigation system equipped with a vehicle navigation system, an interface 6a for connecting to the car navigation system is provided in the in-vehicle control device 6, and the microprocessor 16 of the in-vehicle control device 6 determines the traveling speed from the car navigation system. You may make it read. Alternatively, in the vehicle 2 equipped with the on-board diagnosis device (On-Board Diagnosis), the in-vehicle control device 6 is provided with an interface 6a for connecting to the on-board failure diagnosis device, and the microprocessor 16 of the on-vehicle control device 6 is mounted on the vehicle. The traveling speed may be read from the failure diagnosis device.

  A car navigation system having a speed detection function or an in-vehicle failure diagnosis device is not necessarily mounted on the vehicle 2, but at least the speed detector 5 in FIG. Since a device corresponding to the engine control unit 15 is usually mounted on the vehicle 2, additional processing is performed on the vehicle 2 only for constructing the vehicle length measurement system 1 of this embodiment, or the speed is changed. There is no need to wear the detector 5, and the cost burden on the user side who owns the vehicle 2 is small.

  In this embodiment, the microprocessor 16 of the in-vehicle control device 6 functions as a current speed transmission means.

  FIG. 3 is a functional block diagram showing a simplified connection relationship between the measuring station side narrow area communication wireless communication device 8 provided on the measuring station 7 side including the ETC gate and the like, the computer 9 and the charge settlement terminal 10. FIG.

  As described above, in this embodiment, the ETC narrow-band communication wireless communication device installed at the ETC gate is used as the measuring station-side narrow-band communication wireless communication device 8 to control the opening and closing of the ETC gate bar. The gate control terminal to be used is used as the computer 9.

  A computer 9 including a gate control terminal is a normal computer including a microprocessor 18, a ROM 19, a RAM 20, a hard disk drive 21, and the like. A monitor 23, a keyboard 24, a printer 25, and the like are connected to the input / output circuit 22 thereof. ing. The gate device 26 that opens and closes the gate bar (not shown) is driven and controlled by the microprocessor 18 via the interface 26a, and various data received by the radio communication device 8 for narrow-area communication at the measuring station side is the interface 8a. It is read by the microprocessor 18 via The fee settlement terminal 10 is connected to the microprocessor 18 of the computer 9 so as to be able to transmit information via the interface 10a and the local network or dedicated line already described.

  In this embodiment, the microprocessor 18 of the computer 9 functions as vehicle length calculation means.

  FIG. 4 is a flow chart showing a simplified process repeatedly executed at predetermined intervals by the microprocessor 16 of the in-vehicle controller 6. FIG. 5 is a simplified process executed repeatedly at predetermined intervals by the microprocessor 18 of the computer 9. FIG.

  Next, the processing operations of the microprocessor 16 functioning as the current speed transmission means and the microprocessor 18 functioning as the vehicle length calculation means will be described in detail with reference to FIGS.

  First, the microprocessor 16 of the in-vehicle control device 6 reads the value of the traveling speed of the vehicle 2 currently detected by the speed detector 5 from the engine control unit 15 via the interface 6a (step a1 in FIG. 4). This value is temporarily stored in the current speed storage register RV (step a2).

  Next, the microprocessor 16 determines whether or not the first short-range communication wireless communication device 3 has detected the first communication request (polling signal) from the measurement-station-side narrow communication wireless device 8. (Step a3).

  If the first narrow-area communication wireless communication device 3 has not detected a communication request, the microprocessor 16 further determines that the second narrow-area communication wireless communication device 4 is for the measuring station side narrow-area communication. It is determined whether or not the first communication request (polling signal) is detected from the wireless communication device 8 (step a4), and if the determination results of step a3 and step a4 are also false, the microprocessor 16 In the same manner as described above, only the processing of step a1 to step a4 is repeatedly executed every predetermined period, and each time the current value of the traveling speed of the vehicle 2 is read and updated and stored in the current speed storage register RV, the measuring station side The first communication request from the narrow-area communication wireless communication device 8 is received by the first narrow-area communication wireless communication device 3, or the first communication request from the measuring station-side narrow-area communication wireless communication device 8 is received. Communication request is waiting to be received by the second short range communication radio communication device 4.

  When the vehicle 2 traveling along the travel route X approaches the measuring station 7 while repeatedly performing such processing, first, the first narrowband communication wireless communication provided at the front end of the vehicle 2 is performed. Narrow-area wireless communication between the apparatus 3 and the measurement-site-side narrow-area communication wireless communication apparatus 8 becomes possible, and the first communication request from the measurement-station-side narrow-area communication wireless communication apparatus 8 is the first narrow-area communication. The result is received by the communication wireless communication device 3, and the determination result in step a3 becomes true.

  In this way, it is confirmed that the determination result in step a3 is true, and that the front end of the vehicle 2 has entered the outer portion of the narrow area communicable area (communication area) of the measuring station side narrow area communication wireless communication device 8. Then, the microprocessor 16 functioning as the current speed transmission means measures the value of the traveling speed currently stored in the current speed storage register RV via the interface 3a and the first wireless communication device 3 for narrow area communication. It is transmitted as the traveling speed V1 to the site-side narrow area communication wireless communication device 8 (step a5), and is registered in the number information registered in the in-vehicle control device 6 including the in-vehicle terminal of the ETC, that is, in the vehicle verification. The range information is read out from the storage unit of the in-vehicle control device 6 and transmitted to the measuring-station-side narrow area communication wireless communication device 8 (step a6).

  The process of step a6 is a process required because the in-vehicle control device 6 also functions as an ETC in-vehicle terminal.

  FIG. 8 shows that the vehicle 2 traveling along the travel route X approaches the measuring station 7, and the first narrow-area communication wireless communication device 3 and the measuring station-side narrow-area communication wireless provided at the tip of the vehicle 2. It is the principle of action which simplified and showed the situation when the narrow area wireless communication between the communication apparatuses 8 became possible.

  The hatched portion in FIG. 8 is a substantially narrow area communicable area, and as shown in FIG. 8, the first narrow area communication wireless communication device 3, that is, the tip of the vehicle 2 is the narrow area communicable area. When the vehicle enters the vehicle, the traveling speed V1 of the vehicle 2 at that time is transmitted from the first narrowband communication wireless communication device 3 to the measuring station side narrowband communication wireless communication device 8.

  On the other hand, the microprocessor 18 on the computer 9 side, which is a gate control terminal, repeatedly executes the processing shown in FIG. 5 at predetermined intervals, thereby causing the traveling speed V1 from the first narrowband communication wireless communication device 3 and Whether or not the number information is input and whether or not the traveling speed V2 is input from the second narrow area communication wireless communication device 4 are constantly monitored (step b1 and step b6 in FIG. 5).

  When the traveling speed V1 and the number information are transmitted from the first narrow area communication wireless communication device 3 as described above, the measuring station side narrow area communication wireless communication apparatus 8 obtains the traveling speed V1 and the number information. The microprocessor 18 on the computer 9 side detects the input of the traveling speed V1 and number information in the process of step b1 in FIG.

  The microprocessor 18 that has detected the input of the traveling speed V1 and the number information temporarily stores the value of the traveling speed V1 of the vehicle 2 at the time when the front end portion of the vehicle 2 enters the narrow area communicable region in the first speed storage register RV1. At the same time, the current time T is read from the internal clock provided in the computer 9, and this time T, that is, the reception time T of the traveling speed V1 is temporarily stored in the first time storage register T1 (step b3).

  Next, the microprocessor 18 performs various processing related to the received number information, for example, processing such as confirmation of information required for fee settlement (step b4), and then the registration information included in the number information. The entire length of the vehicle 2 is temporarily stored in the registered vehicle length storage register Ls (step b5).

  The process of step b4 is a process required because the computer 9 also functions as an ETC gate control terminal, and the contents thereof are already known as an ETC related technique.

  When the vehicle 2 traveling along the travel route X further advances, the second narrow area communication wireless communication device 4 and the measuring station side narrow area communication wireless communication device 8 provided at the rear end of the vehicle 2 And the first communication request from the measuring station side narrow area communication wireless communication apparatus 8 is received by the second narrow area communication wireless communication apparatus 4, and step a4 in FIG. The determination result is true.

  Thus, when the determination result of step a4 becomes true and it is confirmed that the rear end portion of the vehicle 2 has entered the outer portion of the narrow area communicable region of the measuring station side narrow area communication wireless communication device 8, The microprocessor 16 functioning as the current speed transmission means narrows the value of the traveling speed currently stored in the current speed storage register RV via the interface 4a and the second narrow area communication wireless communication device 4 to the measuring station side. The travel speed V2 is transmitted to the area communication wireless communication device 8 (step a7).

  FIG. 9 shows the narrowness between the second narrow-area communication wireless communication device 4 and the measurement-station-side narrow communication wireless communication device 8 provided at the rear end of the vehicle 2 traveling along the travel route X. It is an action principle figure which simplified and showed the situation when area wireless communication became possible.

  The hatched portion in FIG. 9 is a substantially narrow area communicable area, and as shown in FIG. 9, the second narrow area communication wireless communication device 4, that is, the rear end portion of the vehicle 2 is capable of narrow area communication. When the vehicle enters the area, the traveling speed V2 of the vehicle 2 at that time is transmitted from the second narrow area communication wireless communication device 4 to the measuring station side narrow area communication wireless communication device 8.

  As described above, the microprocessor 18 on the computer 9 side receives the traveling speed V1 and the number information from the first narrow area communication wireless communication device 3 and the second narrow area communication wireless communication device 4. Whether or not the traveling speed V2 is input is constantly monitored by processing at predetermined intervals, and when the traveling speed V2 is transmitted from the second narrowband communication wireless communication device 4 as described above, the measuring station side The wireless communication device 8 for narrow area communication receives the traveling speed V2, and the microprocessor 18 on the computer 9 side detects the input of the traveling speed V2 in the process of step b6 in FIG.

  The microprocessor 18 that has detected the input of the traveling speed V2 temporarily stores the value of the traveling speed V2 of the vehicle 2 at the time when the rear end portion of the vehicle 2 enters the narrow area communicable region in the second speed storage register RV2. (Step b7) At the same time, the current time T is read from the internal clock provided in the computer 9, and this time T, that is, the reception time T of the traveling speed V2 is temporarily stored in the second time storage register T2 (Step b8).

  Next, the microprocessor 18 functioning as the vehicle length calculation means uses the first and second narrow area communication wireless communication devices based on the data temporarily stored in the registers RV1, RV2, T1, and T2. The average value [(RV1 + RV2) / 2] of the travel speeds V1 and V2 received from 3 and 4 and the difference between the reception times, that is, the value obtained by subtracting the reception time T1 of the travel speed V1 from the reception time T2 of the travel speed V2 [T2- T1] is calculated and multiplied to obtain the length [(T2-T1) · (RV1 + RV2) / 2] of the vehicle 2, and this value is temporarily stored in the measured vehicle length storage register Lc (step b9).

  In an ETC gate or the like, a deceleration operation is often performed when the vehicle 2 enters the gate, but the first wireless communication device 3 for narrow area communication located at the front end of the vehicle 2 is in a narrow area communication possible area. The traveling speed V1 (see FIG. 8) at the time of entry and the traveling speed V2 (FIG. 9) at the time when the second narrow area communication wireless communication device 4 located at the rear end of the vehicle 2 enters the narrow area communicable area. The average [(RV1 + RV2) / 2] with reference) is obtained, and the difference between the reception times [T2−T1], that is, the first narrow area communication wireless communication device 3 and the second narrow area communication wireless By multiplying the distance [T2-T1] required for the vehicle 2 to travel by a distance that is a distance from the communication device 4 and that is comparable to the substantial length of the vehicle 2, the vehicle 2 can be obtained approximately accurately. It is possible to determine the length Lc.

  Next, the microprocessor 18 of the computer 9 which also functions as an ETC gate control terminal reads the value of the registered vehicle total length Ls included in the number information of the vehicle 2 from the registered vehicle length storage register Ls, and the vehicle 2 A deviation | Lc−Ls | between the actually measured value Lc of the vehicle length and the registered vehicle total length Ls is obtained, and it is determined whether or not the deviation | Lc−Ls | is within the range of the allowable value ε (set value). (Step b10).

  If the deviation | Lc−Ls | is within the allowable value ε, it can be assumed that the number information registered in the in-vehicle control device 6 that also serves as the in-vehicle terminal of the ETC is not false. The microprocessor 18, which also functions as the above, drives and controls the gate device 26 via the interface 26a, opens a gate bar (not shown) for a certain period of time, allows the vehicle 2 to pass through the gate, and temporarily stores it in the process of step b4. The number information, that is, the information for fee settlement included in the number information of the vehicle 2 that has passed through the gate at the present time, the registered vehicle total length Ls and the like are transmitted to the fee settlement terminal 10 via the interface 10a and the network, Payment processing by the fee payment terminal 10 is performed (step b12 above), and a series of processing ends.

  On the other hand, when the determination result of step b10 is false, that is, when the vehicle total length Ls on registration of the vehicle 2 and the actual measurement value Lc of the length of the vehicle 2 are remarkably different from each other, Since there is a high possibility that there has been a registration error or falsification in the overall length, the microprocessor 18 of the computer 9 that also functions as a gate control terminal permits the passage of the vehicle 2 in the same manner as described above, while the number information of the vehicle 2 The actual measured value Lc of the length of the vehicle 2 is transmitted to the fee settlement terminal 10 via the interface 10a and the network together with the information for the fee settlement included in the number information instead of the vehicle total length Ls included in the The settlement process is performed based on the actual measurement value Lc by the settlement terminal 10 (step b11 above), and the series of processes is terminated.

  In this embodiment, the reception times T1 and T2 when the values of the traveling speeds V1 and V2 are received from the first and second narrow area communication wireless communication devices 3 and 4 are temporarily stored in the computer 9, and the reception time Although the difference [T2−T1] is obtained, the built-in timer of the computer 9 is restarted when the traveling speed V1 is received from the first short-range wireless communication apparatus 3 (instead of step b3 in FIG. 5). Process), the value of the vehicle traveling speed V1 from the first narrow area communication wireless communication device 3 is obtained by stopping the built-in timer when the traveling speed V2 is received from the second narrow area communication wireless communication apparatus 4. The elapsed time T ′ from when it is received until the value of the vehicle traveling speed V2 is received from the second narrowband communication wireless communication device 4 is measured (processing in place of step b8 in FIG. 5), and the vehicle length is calculated. CPU1 functioning as a means But it is possible to obtain the [T '· (RV1 + RV2) / 2] be the arithmetic expression to obtain the length Lc of the vehicle 2 (the processing in place of step b9 in FIG. 5), the same result as above.

  Next, when the vehicle 2 approaches the measuring station side narrow area communication wireless communication device 8, the first narrow area communication wireless communication device 3 can communicate with the measuring station side narrow area communication wireless communication device 8. At this point, a process of sampling and temporarily storing the value of the traveling speed detected by the speed detector 5 at a predetermined cycle is started, and the second wireless communication device for narrow area communication 4 performs measurement area side narrow area communication. When the communication with the wireless communication device 8 for communication becomes possible, the value of the travel speed temporarily stored is directed to the wireless communication device 8 for narrow area communication via the second wireless communication device 4 for narrow area communication. Based on the value of the traveling speed and the sampling period received by the measuring station side narrow-area communication wireless communication device 8 from the second narrow-area communication wireless communication device 4. Processing when the length is obtained will be described.

  FIG. 6 is a flowchart showing a simplified process repeatedly executed at predetermined intervals by the microprocessor 16 of the in-vehicle control device 6 functioning as a sampling speed transmitting means, and FIG. 7 is a flowchart of the computer 9 functioning as a vehicle length calculating means. 6 is a flowchart schematically showing processing repeatedly executed by a processor at predetermined intervals.

  The microprocessor 16 of the in-vehicle controller 6 first reads the value of the traveling speed of the vehicle 2 detected by the speed detector 5 at the present time from the engine control unit 15 via the interface 6a (step a1 ′ in FIG. 6). This value is temporarily stored in the current speed storage register RV (step a2 ′).

  Next, the microprocessor 16 sets the value 1 indicating that the communication between the first narrow area communication wireless communication device 3 and the measuring station side narrow area communication wireless communication device 8 is possible in the state determination flag F. It is determined whether or not it is set (step a3 ′).

  Here, the value of the state determination flag F is 0 (initial value), and communication between the first narrowband communication wireless communication device 3 and the measurement-station-side narrowband communication wireless communication device 8 must be realized. For example, the microprocessor 16 determines whether or not the first narrow-area communication wireless communication device 3 has detected the first communication request (polling signal) from the measurement-station-side narrow-area communication wireless communication device 8 ( Step a9 ').

  If the first narrow area communication wireless communication device 3 has not detected a communication request, the microprocessor 16 performs only the processing of step a1 ′ to step a3 ′ and step a9 ′ at predetermined intervals in the same manner as described above. Each time it is repeatedly executed, the first communication request from the measuring station side narrow area communication wireless communication device 8 is first read while reading the current value of the traveling speed of the vehicle 2 and updating and storing it in the current speed memory register RV. It waits for reception by the wireless communication device 3 for narrow area communication.

  When the vehicle 2 traveling along the travel route X approaches the measuring station 7 while repeatedly performing such processing, first, the first narrowband communication wireless communication provided at the front end of the vehicle 2 is performed. Narrow-area wireless communication between the apparatus 3 and the measurement-site-side narrow-area communication wireless communication apparatus 8 becomes possible, and the first communication request from the measurement-station-side narrow-area communication wireless communication apparatus 8 is the first narrow-area communication. Received by the communication wireless communication device 3, the determination result of step a9 'becomes true.

  In this way, it is confirmed that the determination result of step a9 ′ is true and the front end portion of the vehicle 2 has entered the outer portion of the narrow area communicable region (communication area) of the measuring station side narrow area communication wireless communication device 8. Then, the microprocessor 16 first determines the state of a value 1 indicating that communication between the first narrow area communication wireless communication device 3 and the measuring station side narrow area communication wireless communication device 8 is possible. After setting the flag F (step a10 ′) and setting the initial value 1 to the index i indicating the number of times of sampling processing (step a11 ′), the number information registered in the in-vehicle control device 6 composed of the ETC in-vehicle terminal. That is, the information of the range described in the vehicle verification is read from the storage unit of the in-vehicle control device 6, and is transmitted to the measuring station side narrow-area communication wireless communication device 8 via the first narrow-range communication wireless communication device 3. With a response signal Shin (step a12 ', step a13').

  Then, the microprocessor 16 functioning as the sampling speed transmission means stores the value of the running speed currently stored in the current speed storage register RV based on the current value of the index i and stores the sampling speed in the storage unit of the in-vehicle controller 6. Temporarily store in the register V (i) (step a14 '). Further, the microprocessor 16 sets a sampling period Δt (for example, a set value of 0.1 second) in the sampling period measuring timer Tx (step a15 ′), and starts measuring the sampling period by the sampling period measuring timer Tx (step a15 ′). Step a16 ').

  The process of step a13 'is a process required because the in-vehicle control device 6 also functions as an ETC in-vehicle terminal.

  On the other hand, the microprocessor 18 on the computer 9 side, which is a gate control terminal, repeatedly executes the processing shown in FIG. 7 at a predetermined cycle, whereby the response signal and number from the first narrowband communication wireless communication device 3 are displayed. The presence or absence of input of information and the presence or absence of input of sampling data V (1) to V (i) from the second narrowband communication wireless communication device 4 are constantly monitored (step b1 ′ in FIG. 7, step b1). b4 ′).

  When the response signal and the number information are transmitted from the first narrow area communication wireless communication device 3 as described above, the measuring station side narrow area communication wireless communication device 8 receives the response signal and the number information. 7, the microprocessor 18 on the computer 9 side detects the input of the response signal and the number information.

  The microprocessor 18 that has detected the input of the response signal and the number information performs various processes related to the received number information, for example, a process such as confirmation of information required for fee settlement (step b2 ′). The total length of the registered vehicle 2 included in the number information is temporarily stored in the registered vehicle length storage register Ls (step b3 ′).

  The process of step b2 'is a process required because the computer 9 also functions as an ETC gate control terminal, and the contents thereof are already known as an ETC related technique.

  On the other hand, the microprocessor 16 of the in-vehicle control device 6 that has started the processing of the next cycle, first, in the same way as described above, the value of the traveling speed of the vehicle 2 detected by the speed detector 5 at the present time via the interface 6a. After reading from the engine control unit 15 (step a1 ′ in FIG. 6), this value is temporarily stored in the current speed storage register RV (step a2 ′), and then whether or not the value 1 is set in the state determination flag F is determined. Although determination is made (step a3 ′), since the value 1 is already set in the state determination flag F at this time, the determination result in step a3 ′ is true.

  Therefore, the microprocessor 16 further determines whether or not the second narrowband communication wireless communication device 4 has detected the first communication request (polling signal) from the measurement-station-side narrowband communication wireless communication device 8. Then, it is determined whether or not the vehicle 2 has already traveled a distance comparable to the total length of the vehicle 2 (step a4 ′).

  Here, the first communication request from the measuring station side narrow area communication wireless communication device 8 is not detected, the determination result of step a4 ′ becomes false, and the vehicle 2 travels a distance comparable to the total length of the vehicle 2. If it is clear that the process is in progress, the microprocessor 16 determines whether or not the sampling period Δt has been measured by the sampling period measurement timer Tx (step a5 ′), and the sampling period Δt is determined. If the timing has not been completed, only the processing from step a1 'to step a5' is repeatedly executed at predetermined intervals, and the current value of the running speed of the vehicle 2 is read each time, as described above, and the current speed storage register Whether the first communication request from the measuring station side narrow-area communication wireless communication device 8 is received by the second narrow-area communication wireless communication device 4 while being updated and stored in the RV, or Waits for the sampling period Δt to be measured by the sampling period measuring timer Tx.

  Since the set value Δt of the sampling period measurement timer Tx is set sufficiently shorter than the time required for the vehicle 2 to travel a distance comparable to the total length of the vehicle 2, wireless communication for measuring station side narrow area communication Until the first communication request from the device 8 is received by the second short-range communication wireless communication device 4, the sampling period measurement timer Tx times up several times.

  Then, when it is confirmed in step a5 ′ that the measurement of the sampling period Δt by the sampling period measurement timer Tx is completed while such processing is repeatedly executed, the microprocessor that functions as sampling rate transmission means 16 increments the value of the index i by 1 (step a6 ′), the value of the traveling speed currently stored in the current speed storage register RV, that is, the value representative of the traveling speed of the vehicle 2 in the next Δt seconds, Based on the current value of the index i, it is temporarily stored in the sampling rate storage register V (i) in the storage unit of the in-vehicle controller 6 (step a14 '), and the sampling period Δt is set in the sampling period measurement timer Tx in the same manner as described above. (Step a15 '), the sampling period measured by the sampling period measuring timer Tx To start measurement (step a16 ').

  Therefore, first, the value of the traveling speed of the vehicle 2 at the moment when the front end of the vehicle 2 first enters the outer portion of the narrow area communicable area of the measurement-station-side narrow area communication wireless communication device 8 is the front end of the vehicle 2. As a value representative of the traveling speed of the vehicle 2 until Δt seconds have elapsed since the first intrusion into the outer portion of the narrow area communicable area (communication area) of the measuring station side narrow area communication wireless communication device 8 Each time the sampling period Δt elapses, the value representative of the next traveling speed of Δt seconds is successively stored in the sampling speed storage register V (2) and the sampling speed storage register. V (3),... Are temporarily stored in order.

  While the sampling process is repeatedly executed in this way, between the second narrow area communication wireless communication device 4 and the measuring station side narrow area communication wireless communication device 8 arranged at the rear end of the vehicle 2. And the first communication request from the measuring station side narrow area communication wireless communication device 8 is received by the second narrow area communication wireless communication device 4, and the determination result in step a4 ′ is true. Then, the microprocessor 16 functioning as a sampling rate transmission means includes a sampling rate storage register V (1), a sampling rate storage register V (2), a sampling rate storage register V (3),. The value of the traveling speed temporarily stored in V (i) [where i is the final value of the index] is transmitted to the measuring station side narrow area communication wireless communication device via the second narrow area communication wireless communication device 4. Send together towards (step a7 '), the value of the state determination flag F is reset to 0 (step a8').

  As described above, the microprocessor 18 on the computer 9 side, which is a control terminal, repeatedly executes the processing shown in FIG. 7 at predetermined intervals, and thereby the response signal from the first narrowband communication wireless communication device 3 and Whether or not the number information is input and whether or not the sampling data V (1) to V (i) are input from the second wireless communication device 4 for narrow area communication are constantly monitored (step b1 ′ in FIG. 7). In step b4 ′), each value of the sampling rate storage register V (1) to sampling rate storage register V (i) transmitted from the second wireless communication device for narrow area communication 4 is processed by the computer 9 in the process of step b4 ′. Detected by the side microprocessor 18.

  The microprocessor 18 that has detected the transmission of data from the second wireless communication device 4 for narrow area communication temporarily stores each value of the sampling rate storage register V (1) to the sampling rate storage register V (i), First, the index j indicating the number of times of execution of the sampling process is initialized to 0 (step b5 ′ in FIG. 7), the value of the integral value storage register Lc is initialized to 0 (step b6 ′), and then the value of the index j Is incremented by 1 (step b7 ′), and it is determined whether or not the value of the index j is within the range of the number i of sampled speeds (step b8 ′).

  If the value of the index j is within the range of the number i of sampled speeds, the microprocessor 18 functioning as the vehicle length calculating means stores the sampling speed storage register V (j) based on the current value of the index j. The value is read, and the travel speed V (j) is multiplied by the sampling period Δt to obtain the movement amount V (j) · Δt of the vehicle 2 during the sampling period Δt, and this value is added to the integral value storage register Lc. (Step b9 ').

  Thereafter, the microprocessor 18 functioning as the vehicle length calculating means repeatedly executes the processing from step b7 'to step b9' in the same manner as described above until the value of the index j exceeds the number i of sampled speeds. Then, [V (1) · Δt + V (2) · Δt + V (3) · Δt +,..., + V (i) · Δt] = Lc is obtained.

  The length of the vehicle 2 is such that the first narrow-area communication wireless communication device 3 and the measuring station-side narrow-area communication wireless communication device 8 can communicate with each other, and then the second narrow-area communication wireless communication device 4. And the traveling speed of the vehicle 2 within the range of the elapsed time until the communication with the measuring station side narrow area communication wireless communication device 8 becomes possible, that is, the traveling time of the vehicle 2. If it is assumed that the traveling speeds V (1), V (2), V (3),..., V (i) do not vary during the sampling period Δt, the microprocessor 18 which is a vehicle length calculating means. [V (1) · Δt + V (2) · Δt + V (3) · Δt +,..., + V (i) · Δt] to execute the discrete integration process, thereby executing the vehicle 2 The length of can be obtained almost accurately.

  In this embodiment, since the value of the sampling period Δt does not vary, the process of step b9 ′ is set to Lc ← Lc + V (j) instead of Lc ← Lc + V (j) · Δt, and the determination result of step b8 ′ is false. If the final value of Lc is multiplied by Δt at the same time, the result is the same.

  The processing from step b10 'to step b12' is the same as the processing from step b10 to step b12 already described with reference to FIG.

  In these embodiments, the ETC in-vehicle terminal is also used as the in-vehicle controller 6 of the vehicle length measurement system 1, and at the same time, the ETC narrow area communication wireless communication apparatus installed at the ETC gate is connected to the measuring station side narrow area. Since it is also used as the communication wireless communication device 8, the cost required for the introduction of the vehicle length measurement system 1 can be reduced.

  FIG. 10 is a conceptual diagram showing the configuration of a vehicle length measurement system according to an embodiment in which the present invention is applied to an ITS smart plate.

  The vehicle length measurement system 1 ′ of this embodiment includes a first narrow area communication wireless communication device 3 ′ composed of a smart plate provided at the front end of the vehicle 2 and a smart provided at the rear end of the vehicle 2. The second narrowband communication wireless communication device 4 ′ made of a plate, a speed detector (not shown) mounted on the vehicle 2, and a measuring station 7 located near the travel route X of the vehicle 2 are installed. The wireless communication device 8 for measuring station side narrow area communication and the computer 9 connected to the wireless communication apparatus 8 for measuring station side narrow area communication.

  The ferry boarding management terminal 10 'is connected to the computer 9 via a local network or a dedicated line. In the ferry boarding management terminal 10 ′, the correspondence between the license number of the vehicle 2 and the length of the vehicle 2 is automatically registered based on the user's self-report when the user reserves the ferry boarding. It has become so. The process of registering data in the database is a design problem and will not be described.

  Each smart plate constituting the first and second narrowband communication wireless communication devices 3 ′ and 4 ′ includes a transceiver for performing narrowband communication and an IC chip for performing simple arithmetic processing. In addition, at least the information of the range described in the vehicle verification, that is, the number information is written in advance in the storage unit of the IC chip of the first wireless communication device 3 ′ for narrow area communication.

  A first wireless communication device 3 'for narrow communication made of a smart plate is attached to the corner of the front number play, and is a speed detector of the vehicle 2, for example, an engine control as shown in FIG. 2, via an interface 3a'. The unit 15 is connected to a car navigation system or an in-vehicle failure diagnosis device that also functions as a speed detector. The second narrow area communication wireless communication device 4 ′ made of a smart plate is attached to the corner of the rear number play, and the speed detector of the vehicle 2, such as the engine control unit 15 or the car navigation system, is connected via the interface 4a ′. It is connected to the system or the on-vehicle failure diagnosis device in parallel with the first narrow-range communication wireless communication device 3 ′.

  Each of the IC chips of the first and second wireless communication devices 3 ′ and 4 ′ for the narrow band communication composed of smart plates has independent control programs for causing these IC chips to function as current speed transmission means. Is stored in.

  FIG. 11 shows an outline of processing repeatedly executed at predetermined intervals by the IC chip built in the first narrow-area communication wireless communication device 3 ′, and FIG. FIG. 12 shows an outline of processing that is repeatedly executed at predetermined intervals by the built-in IC chip.

  The IC chip incorporated in the first short-range communication wireless communication device 3 ′ reads the current value of the traveling speed of the vehicle 2 through the interface 3a ′, and updates and stores it in the current speed storage register RV in the IC chip. The processing (step c1 to step c2) and the processing (step c3) for determining whether or not communication is possible between the measuring station side narrow-area communication wireless communication device 8 are repeatedly executed at predetermined intervals. The IC chip of the first short-range communication wireless communication device 3 ′ functioning as the speed transmission means is the first time when communication with the measurement-station-side narrow-area communication wireless communication device 8 is possible, that is, the determination in step c3. When the result becomes true, the value of the traveling speed stored in the current speed storage register RV of the IC chip is transmitted as the traveling speed V1 to the measuring station side narrow area communication wireless communication device 8. And transmits the registered number information towards the IC chip of the storage unit measuring plant side short range communication for a radio communication device 8 reads from (step c4).

  Further, the IC chip built in the second narrow area communication wireless communication device 4 ′ reads the current value of the traveling speed of the vehicle 2 through the interface 4a ′ and updates the current speed storage register RV in the IC chip. The process of storing (step d1 to step d2) and the process of determining whether communication is possible with the measuring station side narrow area communication wireless communication device 8 (step d3) are repeatedly executed at predetermined intervals. The IC chip of the second narrowband communication wireless communication device 4 ′ functioning as the current speed transmitting means is the first point when communication with the measuring station side narrowband communication wireless communication device 8 is possible, that is, step d3. When the determination result becomes true, the value of the traveling speed stored in the current speed storage register RV of the IC chip is set as the traveling speed V2 toward the radio communication device 8 for the measuring station side narrow area communication. To trust (step d4).

  Processing on the computer 9 side that receives the traveling speed V1 and number information transmitted from the first narrow area communication wireless communication device 3 ′ and the traveling speed V2 transmitted from the second narrow area communication wireless communication device 4 ′. 5 can be applied as it is.

  However, when it is confirmed that the determination result in step b10 is true and the deviation | Lc−Ls | is within the range of the allowable value ε, that is, the IC of the first narrowband communication wireless communication device 3 ′. When it is determined that the number information registered in the chip is not false, the number information temporarily stored in the process of step b4, that is, the vehicle that has finished measuring the length of the vehicle at the present time, is substituted for step b12. The information for fee settlement included in the number information No. 2 and the total vehicle length Ls on registration are transmitted to the boarding management terminal 10 'for ferry via the network.

  The ferry boarding management terminal 10 'searches the reservation information registered in the database of the terminal 10' using the license number included in the number information received from the computer 9 as an index, and the user of this vehicle 2 reports it The vehicle length is read from the database, the reported vehicle length is compared with the vehicle total length Ls, and the determination result of coincidence / inconsistency with the vehicle total length Ls is displayed and output on the monitor of the boarding management terminal 10 ′. This display is confirmed by the boarding officer, and when the coincidence determination result is displayed, the boarding officer permits the vehicle 2 to board. In this case, the total vehicle length Ls on registration and the measured value Lc of the vehicle length already coincide with each other. Therefore, unless the user makes an erroneous declaration at the time of reservation, the vehicle management terminal 10 'always matches the monitor. Will be displayed. If the discrepancy determination result is displayed, it means that the user has made an incorrect declaration about the length of the vehicle at the time of reservation, so that the boarding officer can use the full length Ls of the vehicle (the same applies to Lc if necessary). ) Depending on the boarding fee, or by refusing boarding.

  Further, when the determination result in step b10 is false and it is confirmed that the deviation | Lc−Ls | exceeds the allowable value ε, that is, the total vehicle length Ls on the registration of the vehicle 2 and the length of the vehicle 2 If the measured value Lc of the vehicle 2 is significantly different from the actual value Lc of the vehicle 2, the number information includes the actual measured value Lc of the length of the vehicle 2 instead of the total vehicle length Ls included in the number information of the vehicle 2 as a process instead of the step b11 The information is sent to the boarding management terminal 10 'for ferry via the network together with the information for toll payment.

  The ferry boarding management terminal 10 'searches the reservation information registered in the database of the terminal 10' using the license number included in the number information received from the computer 9 as an index, and the user of this vehicle 2 reports it The vehicle length is read from the database, the reported vehicle length is compared with the vehicle total length Lc, and the determination result of coincidence / inconsistency with the vehicle total length Lc is displayed and output on the monitor of the boarding management terminal 10 ′. In this case, since the registered vehicle total length Ls and the measured value Lc of the vehicle length do not match, there is a high possibility that the registered total length in the number information has been falsified. Even if the user falsifies the registered total length in the number information and declares this value Ls as the total length when making a reservation for boarding, as a result, the vehicle length measurement value Lc is self-reported. The comparison with the vehicle length shows that the self-declared value is not an appropriate value and that the total length of the registration in the number information has been falsified. The judgment result of mismatch will be displayed. As necessary, the boarding officer collects a boarding fee corresponding to the actual measured value Lc of the vehicle length, or copes with a method such as refusing boarding.

  When the ferry is on board, no particular acceleration / deceleration is performed, and the vehicle 2 normally travels at a constant speed in the slowest running state. Therefore, the processing on the computer 9 side for obtaining the length of the vehicle 2, that is, FIG. In step b9 in step 5, it is not always necessary to obtain the average value of the traveling speed of the vehicle 2, and the traveling speed V1 received from the first narrow area communication wireless communication device 3 'is used as a representative traveling speed. This value V1 is multiplied by the difference in reception time [T2−T1] or the measured value T ′ of elapsed time, or the traveling speed V2 received from the second narrowband communication wireless communication device 4 ′ is traveled. The speed L may be used as a representative value, and the vehicle length Lc may be obtained by multiplying this value V2 by a difference in reception time [T2−T1] or a measured value T ′ of elapsed time.

  Alternatively, when the vehicle 2 approaches the measuring station side narrow area communication wireless communication device 8, the first narrow area communication wireless communication device 3 ′ can communicate with the measuring station side narrow area communication wireless communication device 8. The processing of sampling the value of the traveling speed detected by the speed detector of the vehicle 2 at every predetermined period Δt and transmitting it to the second wireless communication device 4 ′ for narrow area communication as a speed transmitting means Starting with the IC chip of the first short-range communication wireless communication device 3 ′, and sequentially storing the sampling data of the traveling speed sequentially on the second narrow-area communication wireless communication device 4 ′ side, The second narrow area communication wireless communication device 4 ′ that functions as a sampling rate transmitting means when the narrow area communication wireless communication device 4 ′ becomes communicable with the measuring station side narrow area communication wireless communication device 8. The IC chip The sampling data of 憶 to the travel speed may be transmitted together toward the measurement office side DSRC radio communication apparatus 8.

  Even when such processing is performed, the substantial processing contents are the same as those in the flowchart shown in FIG. However, in this case, the processing of step a1 ′ to step a3 ′ and step a9 ′ to step a16 ′ and step a5 ′ to step a6 ′ in FIG. 6 is handled by the IC chip (speed transmission means) of the wireless communication device 3 ′. The processing of step a4 'and step a7' to step a8 'in FIG. 6 is handled by the IC chip (sampling rate transmission means) of the wireless communication device 4'. Since the program division and data transfer between the IC chips required in this case are design problems, the description thereof will be omitted.

  Also in this case, the processing shown in FIG. 7 can be applied as it is as the processing on the computer 9 side that receives the sampling data of the traveling speed transmitted from the second wireless communication device 4 ′ for narrow area communication. .

  However, when the determination result in step b10 ′ is true and it is confirmed that the deviation | Lc−Ls | is within the range of the allowable value ε, that is, the first narrowband communication wireless communication device 3 ′. If it is determined that the number information registered in the IC chip is not fake, the number information temporarily stored in the process of step b2 ′, that is, the length of the vehicle at the present time, is measured as an alternative to step b12 ′. The information for fee settlement included in the number information of the finished vehicle 2, the registered vehicle total length Ls, etc. are transmitted to the boarding management terminal 10 ′ for ferry via the network, and the determination result of step b10 ′ Is false and it is confirmed that the deviation | Lc−Ls | exceeds the allowable value ε, that is, the total vehicle length Ls on registration of the vehicle 2 and the actual measurement value Lc of the length of the vehicle 2 are remarkably large. If they are different As a process in place of step b11 ′, instead of the vehicle total length Ls included in the number information of the vehicle 2, the measured value Lc of the length of the vehicle 2 is combined with information for fee settlement included in the number information, etc. To the boarding management terminal 10 ′ for ferries.

  Of course, when the vehicle 2 approaches the measuring station side narrow area communication wireless communication device 8, the first narrow area communication wireless communication device 3 'can communicate with the measuring station side narrow area communication wireless communication device 8. At this time, the first narrow-band processing is performed by sampling the value of the traveling speed detected by the speed detector of the vehicle 2 for each predetermined period Δt and sequentially storing it in the first narrow area communication wireless communication device 3 ′. These are started by the IC chip of the wireless communication device 3 ′ for regional communication, and when the second wireless communication device 4 ′ for narrow-area communication becomes communicable with the wireless communication device 8 for narrow-area communication, these Sampling data is collectively transferred from the first short-range communication wireless communication device 3 ′ to the second narrow-area communication wireless communication device 4 ′, and further, the IC of the second narrow-area communication wireless communication device 4 ′. With the chip, these sampling data are transmitted to the measuring station side narrow area communication wireless It is also possible, such as to send together towards the communication apparatus 8.

  In these embodiments, the ITS smart plate is connected to the first and second narrowband communication wireless communication devices 3 ′ and 4 ′ in the vehicle length measurement system 1 ′, the current speed transmission means, the speed transmission means, and the sampling speed transmission means. Therefore, the cost required for introducing the vehicle length measurement system 1 ′ can be reduced.

It is the conceptual diagram shown about the structure of the vehicle length measurement system of one Example to which this invention is applied. It is the functional block diagram which simplified and showed the connection relation of the 1st, 2nd radio | wireless communication apparatus for narrow area communication mounted on the vehicle side, a speed detector, and a vehicle-mounted control apparatus. It is the functional block diagram which simplified and showed the connection relation of the radio | wireless communication apparatus for a measurement station side narrow area communication and the computer which are arrange | positioned at the measurement station side. It is the flowchart which simplified and showed the process performed by the microprocessor of the vehicle-mounted control apparatus which consists of a vehicle-mounted terminal of ETC (each 1st, 2nd wireless communication apparatus for narrow area communication is for measurement area side narrow area communication) Processing when the length of the vehicle is obtained based on two travel speed values detected by the speed detector when communication with the wireless communication device becomes possible. 6 is a flowchart showing a simplified process executed by a microprocessor of a computer including a gate control terminal (each of the first and second narrow-area communication wireless communication apparatuses is a measuring station-side narrow-area communication wireless communication apparatus). And processing when the length of the vehicle is obtained based on the values of the two traveling speeds detected by the speed detector when communication with the vehicle becomes possible. It is the flowchart which simplified and showed the process performed by the microprocessor of the vehicle-mounted control apparatus which consists of a vehicle-mounted terminal of ETC (the 1st communication device for narrow area communication communicates with the radio communication apparatus for narrow area communication of a measurement station side) The travel speed value detected by the speed detector when it becomes possible is sampled at predetermined intervals and temporarily stored, and the second narrow area communication wireless communication device uses the measurement station side narrow area communication wireless communication. When the sampling data is sent from the second narrowband communication wireless communication device to the measuring station side narrowband communication wireless communication device when communication with the device becomes possible, the computer determines the length of the vehicle. processing). 6 is a flowchart showing a simplified process executed by a microprocessor of a computer including a gate control terminal (the first narrow-area communication wireless communication device can communicate with the measuring-station-side narrow-area communication wireless communication device. The value of the running speed detected by the speed detector is sampled at a predetermined cycle and temporarily stored, and the second narrowband communication wireless communication device communicates with the measuring station-side narrowband communication wireless communication device. Processing when the computer determines the length of the vehicle by transmitting the sampling data from the second narrow-area communication wireless communication device to the measuring station-side narrow-area communication wireless communication device when it becomes possible). A vehicle traveling along a travel route approaches the measurement station, and the narrow area between the first narrow-area communication wireless communication device and the measurement-station-side narrow communication wireless communication device arranged at the tip of the vehicle. It is an operation principle figure which simplified and showed the situation when radio | wireless communication became possible. Narrow-band wireless communication between the second narrow-band communication wireless communication device deployed at the rear end of the vehicle traveling along the travel route and the measuring-station-side narrow-band communication wireless communication device is now possible. It is an action principle figure which simplified and showed the situation at the time. It is the conceptual diagram shown about the structure of the vehicle length measurement system of other one Example to which this invention is applied. It is the flowchart which simplified and showed the process performed by the IC chip incorporated in the smart plate which functions as a 1st wireless communication apparatus for narrow area communication. It is the flowchart which simplified and showed the process performed by the IC chip incorporated in the smart plate which functions as a 2nd radio | wireless communication apparatus for narrow area communication.

Explanation of symbols

1, 1 'vehicle length measurement system 2 vehicle 3 first wireless communication device for narrow area communication 3' first wireless communication device for narrow area communication (smart plate, current speed transmission means)
3a, 3a 'interface 4 second wireless communication device for narrow area communication 4' second wireless communication device for narrow area communication (smart plate, current speed transmission means)
4a, 4a 'Interface 5 Speed detector 6 On-board controller (ETC on-board terminal)
6a interface 7 measuring station 8 measuring station side wireless communication device for narrow area communication (wireless communication device for narrow area communication for ETC)
8a interface 9 computer (gate control terminal)
DESCRIPTION OF SYMBOLS 10 Charge settlement terminal 10 'Boarding management terminal 10a for ferry Interface 11 Throttle opening sensor 12 Engine rotation sensor 13 Shift position detection sensor 14 Input / output circuit 15 Engine control unit 16 Microprocessor (vehicle speed control means, pulling) Speed transmission means)
17 Microprocessor of engine control unit 18 Microprocessor of a computer comprising a gate control terminal (vehicle length calculation means)
19 ROM
20 RAM
21 Hard Disk Drive 22 Input / Output Circuit 23 Monitor 24 Keyboard 25 Printer 26 Gate Device 26a Interface X Traveling Route

Claims (14)

A first narrow-area communication wireless communication device deployed at the front end of the vehicle; a second narrow-area communication wireless communication device deployed at the rear end of the vehicle; and a speed detection implemented in the vehicle. And a vehicle-mounted control device electrically connected to the first and second narrow area communication wireless communication devices and the speed detector, and a measuring station located in the vicinity of the travel route of the vehicle. A vehicle length measurement system having a wireless communication device for narrow station communication at a measuring station and a computer connected to the wireless communication device for narrow station communication,
In the in-vehicle control device, each of the first and second narrow area communication wireless communication devices is connected to the measurement station side narrow area communication when the vehicle approaches the measurement station side narrow area communication wireless communication apparatus. The value of the running speed detected by the speed detector at the time when communication with the wireless communication device for communication is possible is performed through the first and second narrow-area communication wireless communication devices in the measuring station side narrow-area communication. Providing a current speed transmitting means for transmitting to the wireless communication device for
The computer includes the vehicle based on a difference between a traveling speed value received from the first and second narrow area communication wireless communication devices and a reception time thereof by the measuring station side narrow area communication wireless communication device. A vehicle length measurement system comprising vehicle length calculation means for determining the length of the vehicle. A first narrow-area communication wireless communication device deployed at the front end of the vehicle; a second narrow-area communication wireless communication device deployed at the rear end of the vehicle; and a speed detection implemented in the vehicle. And a vehicle-mounted control device electrically connected to the first and second narrow area communication wireless communication devices and the speed detector, and a measuring station located in the vicinity of the travel route of the vehicle. A vehicle length measurement system having a wireless communication device for narrow station communication at a measuring station and a computer connected to the wireless communication device for narrow station communication,
In the vehicle-mounted control device, the first narrow-area communication wireless communication device is connected to the measurement-station-side narrow communication wireless communication device when the vehicle approaches the measurement-station-side narrow communication wireless communication device. A process of sampling and temporarily storing the value of the traveling speed detected by the speed detector at the time when communication is possible starts at a predetermined cycle, and the second wireless communication device for narrow area communication performs the measurement When the communication with the station-side narrow area communication wireless communication device becomes possible, the temporarily stored travel speed value is transmitted to the measurement station-side narrow area communication wireless device via the second narrow-area communication wireless communication device. Provide sampling rate transmission means to transmit collectively to the communication device,
The computer includes a vehicle for obtaining a length of the vehicle based on a value of a traveling speed and a sampling cycle received from the second wireless communication device for narrow-area communication by the measurement-station-side narrow-area communication wireless communication device. A vehicle length measurement system comprising a length calculation means.   The vehicle length measurement system according to claim 1 or 2, wherein the vehicle-mounted control device is configured by an ETC vehicle-mounted terminal. A first narrow-area communication wireless communication device deployed at the front end of the vehicle; a second narrow-area communication wireless communication device deployed at the rear end of the vehicle; and a speed detection implemented in the vehicle. A measuring station-side narrow-area communication wireless communication device installed in a measuring station located in the vicinity of the travel route of the vehicle, and a computer connected to the measuring-station-side narrow area communication wireless communication device A vehicle length measurement system,
Each of the first and second narrowband communication wireless communication devices includes the first and second narrowband communication wireless devices when the vehicle approaches the measuring station side narrowband communication wireless communication device. The value of the traveling speed detected by the speed detector at the time when each of the communication devices becomes communicable with the measurement-site-side narrow-area communication wireless communication device is sent to the measurement-station-side narrow-area communication wireless communication device. Provide a current speed transmission means to send to,
The computer includes the vehicle based on a difference between a traveling speed value received from the first and second narrow area communication wireless communication devices and a reception time thereof by the measuring station side narrow area communication wireless communication device. A vehicle length measurement system comprising vehicle length calculation means for determining the length of the vehicle. A first narrow-area communication wireless communication device deployed at the front end of the vehicle; a second narrow-area communication wireless communication device deployed at the rear end of the vehicle; and a speed detection implemented in the vehicle. A measuring station-side narrow-area communication wireless communication device installed in a measuring station located in the vicinity of the travel route of the vehicle, and a computer connected to the measuring-station-side narrow area communication wireless communication device A vehicle length measurement system,
In the first short-range communication wireless communication device, when the vehicle approaches the measurement-station-side narrow communication wireless communication device, the first short-range communication wireless communication device is A speed at which the value of the traveling speed detected by the speed detector at the time when communication with the wireless communication device for regional communication becomes possible is sampled at predetermined intervals and transmitted to the second wireless communication device for narrow communication Providing transmission means,
The second narrow-area communication wireless communication device temporarily stores the traveling speed value transmitted from the first narrow-area communication wireless communication device in order, and the second narrow-area communication wireless communication device. Sampling speed at which the temporarily stored travel speed value is collectively transmitted to the measuring station-side narrow area communication wireless communication device when communication with the measuring station-side narrow area communication wireless communication apparatus becomes possible Providing transmission means,
The computer includes a vehicle for obtaining a length of the vehicle based on a value of a traveling speed and a sampling cycle received from the second wireless communication device for narrow-area communication by the measurement-station-side narrow-area communication wireless communication device. A vehicle length measurement system comprising a length calculation means.   6. The vehicle length measuring system according to claim 4, wherein the first and second narrow-area communication wireless communication devices are configured by smart plates before and after the vehicle.   The computer is connected to an ETC fee settlement terminal, the computer transmits the vehicle length calculated by the vehicle length calculation means to the fee settlement terminal, and the fee settlement terminal receives the received vehicle length. 7. The vehicle length measurement system according to claim 1, wherein the fee is settled based on the vehicle speed measurement system according to claim 1, claim 2, claim 3, claim 4, claim 5 or claim 6.   The computer is connected to a boarding management terminal for a ferry, the computer transmits the vehicle length calculated by the vehicle length calculation means to the boarding management terminal, and the boarding management terminal corresponds to the vehicle. And determining whether or not the length of the vehicle registered in advance in the boarding management terminal matches the length of the received vehicle, and displaying the determination result. The vehicle length measurement system according to claim 3, claim 4, claim 5 or claim 6.   The vehicle length calculation means obtains the length of the vehicle by multiplying the average of the traveling speed values received from the first and second narrow area communication wireless communication devices by the difference in reception time. The vehicle length measurement system according to claim 1 or claim 4.   The vehicle length calculating means multiplies the value of the traveling speed received from any one of the first and second narrow area communication wireless communication devices by the difference in the reception time to obtain the vehicle length. The vehicle length measurement system according to claim 1 or 4, wherein the vehicle length measurement system is obtained. When the first narrow-area communication wireless communication device arranged at the front end of the vehicle enters the communicable range with the measurement-station-side narrow communication wireless communication device, the measurement-station-side narrow communication wireless communication device The computer connected to the wireless communication device for narrow area communication temporarily stores the value of the vehicle traveling speed received from the first wireless communication device for narrow area communication and the reception time thereof,
Further, when the second narrow area communication wireless communication device provided at the rear end of the vehicle enters the communicable range with the measurement station side narrow communication wireless communication apparatus, the measurement station side narrow area After the computer temporarily stores the value of the vehicle traveling speed and the reception time received by the wireless communication device for communication from the second wireless communication device for narrow area communication,
The computer calculates the difference between the average of the traveling speed values temporarily stored in the computer and the reception time, and obtains the vehicle length by multiplying the average by the difference in the reception time. Measurement method. When the first narrow-area communication wireless communication device arranged at the front end of the vehicle enters the communicable range with the measurement-station-side narrow communication wireless communication device, the measurement-station-side narrow communication wireless communication device The computer connected to the wireless communication device for narrow area communication temporarily stores the value of the vehicle traveling speed received from the first wireless communication device for narrow area communication and the reception time thereof,
Further, when the second narrow area communication wireless communication device provided at the rear end of the vehicle enters the communicable range with the measurement station side narrow communication wireless communication apparatus, the measurement station side narrow area After the computer temporarily stores the value of the vehicle traveling speed and the reception time received by the wireless communication device for communication from the second wireless communication device for narrow area communication,
The computer calculates a difference in reception time temporarily stored in the computer, and multiplies one of predetermined values of travel speed values temporarily stored in the computer by the difference in reception time. A vehicle length measuring method characterized in that the vehicle length is obtained. Instead of temporarily storing in the computer the reception time when the value of the vehicle travel speed is received from the first and second narrow area communication wireless communication devices,
The elapsed time from when the vehicle travel speed value is received from the first narrow-area communication wireless communication device until the vehicle travel speed value is received from the second narrow-area communication wireless communication device. The computer measures,
The vehicle length measurement method according to claim 11 or 12, wherein the vehicle length is obtained by using the elapsed time instead of the difference in the reception time. The traveling speed detected by the speed detector when the first narrow-area communication wireless communication device deployed at the front end of the vehicle enters the communicable range with the measurement-station-side narrow-area communication wireless communication device. Is temporarily stored in the first narrowband communication wireless communication device or the second narrowband communication wireless communication device arranged at the rear end of the vehicle,
When the second narrow area communication wireless communication apparatus becomes communicable with the measuring station side narrow area communication wireless communication apparatus, the temporarily stored travel speed value is used as the second narrow area communication wireless communication apparatus. Transmit collectively to the wireless communication device for narrow area communication through the communication device,
The computer connected to the wireless communication device for narrow area communication performs discrete integration processing based on the value of the traveling speed and the sampling period received from the second wireless communication device for narrow area communication, and A vehicle length measurement method characterized by obtaining a length.

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