JP2001331889A - Vehicle speed detection system, overspeed warning system using the same, and congestion information providing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system for providing the information on congestion within a short distance or overspeed information by detecting vehicle speed at low cost while using on-vehicle equipment and road side equipment. SOLUTION: The vehicle speed is calculated corresponding to how many times radio communication can be performed in a radio communication area between road side equipment 2 installed at prescribed intervals along a road and on-vehicle equipment 4. Otherwise, the vehicle speed is calculated on the basis of the time difference of communication with the on-vehicle equipment between the upstream side road side equipment and the downstream side road side equipment. Besides, an overspeed alarm is reported to a driver by comparing the calculated running speed with a speed threshold. Besides, the congestion information is reported to the driver by comparing the running speed of a vehicle preceding for prescribed time with the speed threshold. Otherwise, the running speed data of the preceding vehicle are transmitted from the downstream side road side equipment to the upstream side road side equipment and the range of congestion is judged on the basis of these running speed data. In this case, by selecting the running speed data stored in the on-vehicle equipment by the vehicle, the running speed data are transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle speed detection system, an excessive speed warning system using the same, and a traffic jam information providing system, and more particularly, to an on-board unit used in a toll road automatic toll collection system other than a toll road automatic toll collection system. It is useful when applied to other applications.

[0002]

2. Description of the Related Art At present, ETC (Electronic Toll Collec
A trial operation of a toll road automatic toll collection system using wireless communication known as "action: automatic toll collection system" has been started. This system transmits data by wireless communication between a roadside device with wireless communication function installed on the road side at a tollgate on a toll road and a vehicle-mounted device with wireless communication function mounted on the vehicle. In this method, the toll on a toll road is subtracted from the vehicle-mounted device or the IC card provided in the vehicle-mounted device.

[0003]

To implement an automatic toll road toll collection system as described above, it is necessary to mount an on-board unit in a vehicle. It is hoped that it will also be used.

[0004] On the other hand, there is a demand for a system for providing traffic congestion information and excess speed information to a driver. However, in order to implement a congestion information providing system and an excessive speed warning system, sensors such as ultrasonic sensors and radar must be provided on the road side to detect the traveling speed of the vehicle. Indicators for notifying information and overspeed information must also be installed on the road side.

[0005] In addition, a conventional congestion information providing system using an ultrasonic sensor or the like provides distant congestion information, but does not cope with short-distance congestion. For this reason,
While driving on a highway, I noticed that there was heavy traffic in front of me,
Sometimes you may experience the hassle of sudden braking. However, in order to provide the driver with such short-distance traffic congestion information and excessive speed information, it is necessary to provide many detection sensors and indicators along the road, which requires a large amount of equipment cost. Become.

Accordingly, in view of the above problems, the present invention provides a system for detecting vehicle speed at low cost and providing short-distance traffic information and excess speed information by using an on-vehicle device and a roadside device. That is the task.

[0007]

Means for Solving the Problems A first method for solving the above problems is described below.
In the vehicle speed detection system of the invention, roadside devices are installed at predetermined intervals along a road, and these roadside devices repeatedly perform wireless communication with a vehicle-mounted device of a vehicle traveling on the road in each wireless communication region at a constant cycle. By exchanging and counting the number of communications, it is determined how many times radio communication with the on-vehicle device can be exchanged in each wireless communication area, and the traveling speed of the vehicle is calculated based on the number of communications. .

[0008] In addition, the overspeed warning system according to the second aspect of the present invention is to install roadside units at predetermined intervals along a road, and to install the roadside units in a vehicle on a road in each wireless communication area. By repeatedly exchanging wireless communication at a fixed cycle and counting the number of communication times, it is determined how many times the wireless communication with the on-vehicle device can be performed in each wireless communication area, and based on the number of communication times, the traveling speed of the vehicle is determined. The upstream roadside machine in the traveling direction of the vehicle determines whether or not the calculated traveling speed is overspeed and transmits the overspeed information to the downstream roadside machine in the traveling direction of the vehicle, and the downstream roadside machine Then, this speed excess warning is transmitted to the vehicle-mounted device by wireless communication, or the traveling speed calculated by the upstream roadside machine is transmitted from the upstream roadside machine to the downstream roadside machine, and the downstream roadside machine transmits the traveling speed calculated by the upstream roadside machine. It is determined whether or not the traveling speed is excessive speed, and the excessive speed information is transmitted to the vehicle-mounted device by wireless communication. Is notified.

Further, the traffic congestion information providing system according to a third aspect of the present invention is to install roadside units at predetermined intervals along a road, and to install the roadside units in a vehicle traveling on the road in each wireless communication area. By repeatedly exchanging wireless communication at a fixed cycle and counting the number of communication times, it is determined how many times the wireless communication with the on-vehicle device can be performed in each wireless communication area, and based on the number of communication times, the traveling speed of the vehicle is determined. , The respective roadside units transmit the traveling speed of the preceding vehicle detected a predetermined time ago to the vehicle-mounted device of the following vehicle by wireless communication, or determine whether or not there is a traffic jam based on the traveling speed of the preceding vehicle. And transmitting the congestion information to the on-board unit of the following vehicle by wireless communication. The on-board unit of the following vehicle transmits the traveling speed of the preceding vehicle transmitted from the downstream roadside unit. It is determined whether a traffic jam based on, or based on the traffic jam information sent from the downstream side roadside device, to notify the congestion information to the driver by notifying means and.

In the traffic congestion information providing system according to a fourth aspect of the present invention, roadside devices are installed at predetermined intervals along a road, and these roadside devices are provided with an onboard device of a vehicle traveling on the road in each wireless communication area. By repeatedly exchanging wireless communication at a fixed cycle and counting the number of communication times, it is determined how many times the wireless communication with the on-vehicle device can be performed in each wireless communication area, and based on the number of communication times, the traveling speed of the vehicle is determined. Is transmitted from the downstream roadside machine in the vehicle traveling direction to the upstream roadside machine, the traveling speed of the preceding vehicle calculated by each roadside machine is transmitted, and the upstream roadside machine congests based on these traveling speeds. Judging the range, transmitting this traffic information to the onboard device of the following vehicle by wireless communication, the onboard device of the following vehicle, based on this traffic information,
The driver is informed of the congested area by the notifying means.

The traffic congestion information providing system according to a fifth aspect of the present invention provides roadside devices at predetermined intervals along a road, and these roadside devices are provided with an onboard device of a vehicle traveling on the road in each wireless communication area. By repeatedly exchanging wireless communication at a fixed cycle and counting the number of communication times, it is determined how many times the wireless communication with the on-vehicle device can be performed in each wireless communication area, and based on the number of communication times, the traveling speed of the vehicle is determined. The traveling speed of the preceding vehicle calculated by the roadside machine in one lane is transmitted from the roadside machine in one lane to the roadside machine in the oncoming lane at the same point as this roadside machine, and From the roadside machine to the vehicle-mounted device of the vehicle running in the oncoming lane by wireless communication and stored in the vehicle-mounted device, and this vehicle travels in the oncoming lane to the downstream side in the vehicle traveling direction of the oncoming lane. And, by wireless communication from the on-board unit of the vehicle in the opposite lane to the downstream roadside machine in the vehicle traveling direction of the oncoming lane, one lane at the same point as the roadside machine from the downstream roadside machine in the oncoming lane To the upstream roadside machine in the vehicle traveling direction, and based on the traveling speed of the preceding vehicle sent from the downstream roadside machine to the upstream roadside machine in one lane in this way, The side roadside unit determines the congestion range of one lane, and transmits this congestion information to the on-board unit of the following vehicle traveling on one lane by wireless communication. Based on the notification, the driver is notified of the congestion range by the notification means.

In the vehicle speed detection system according to the sixth aspect of the present invention, roadside devices are installed at predetermined intervals along a road, and these roadside devices sequentially communicate with a vehicle-mounted device of a vehicle running on the road, The communication time with the vehicle-mounted device in the upstream roadside machine is transmitted from the upstream roadside machine in the vehicle traveling direction to the downstream roadside machine, and in the downstream roadside machine, the communication time of this upstream roadside machine and the downstream roadside machine A communication time difference is obtained from the communication time with the on-vehicle device, and a traveling speed of the vehicle is calculated based on the communication time difference.

[0013] In addition, the overspeed warning system according to the seventh aspect of the present invention is to install roadside devices at predetermined intervals along a road, and these roadside devices sequentially communicate with a vehicle-mounted device of a vehicle running on the road by wireless communication. The communication time with the vehicle-mounted device in the upstream roadside machine is transmitted from the upstream roadside machine in the vehicle traveling direction to the downstream roadside machine, and the communication time of the upstream roadside machine and the downstream roadside machine are transmitted to the downstream roadside machine. A communication time difference is determined from the communication time with the on-vehicle device in the above, and the traveling speed of the vehicle is calculated based on the communication time difference.
Determining whether or not the calculated traveling speed is overspeed and transmitting the overspeed information to the vehicle-mounted device by wireless communication,
The vehicle-mounted device is characterized by notifying the driver of an overspeed warning by the notification means based on the overspeed information.

The traffic congestion information providing system according to an eighth aspect of the present invention is to install roadside devices at predetermined intervals along a road, and these roadside devices sequentially communicate with a vehicle-mounted device of a vehicle traveling on a road by wireless communication. The communication time with the vehicle-mounted device in the upstream roadside machine is transmitted from the upstream roadside machine in the vehicle traveling direction to the downstream roadside machine, and the communication time of the upstream roadside machine and the downstream roadside machine are transmitted to the downstream roadside machine. Determining a communication time difference from the communication time with the on-vehicle device, and calculating a traveling speed of the vehicle based on the communication time difference.In each of the roadside units, the traveling speed of the preceding vehicle detected a predetermined time ago is determined by the following vehicle. To be transmitted to the on-board unit by wireless communication, or
Based on the traveling speed of the preceding vehicle, it is determined whether or not there is congestion, and the congestion information is transmitted by wireless communication to the on-vehicle device of the following vehicle. In the on-vehicle device of the following vehicle, the preceding vehicle transmitted from the downstream roadside device is transmitted. Determining whether or not there is congestion based on the traveling speed of the vehicle, or notifying the driver of the congestion information by the notification means based on the congestion information transmitted from the downstream roadside machine. .

The traffic congestion information providing system according to a ninth aspect of the present invention is to install roadside devices at predetermined intervals along a road, and these roadside devices sequentially communicate with a vehicle-mounted device of a vehicle traveling on a road by wireless communication. The communication time with the vehicle-mounted device in the upstream roadside machine is transmitted from the upstream roadside machine in the vehicle traveling direction to the downstream roadside machine, and the communication time of the upstream roadside machine and the downstream roadside machine are transmitted to the downstream roadside machine. Determining a communication time difference from the communication time with the on-vehicle device, calculating the traveling speed of the vehicle based on the communication time difference, and calculating the preceding vehicle calculated from the downstream roadside machine to the upstream roadside machine by each roadside machine. The upstream roadside machine determines the congestion range based on these traveling speeds and transmits this congestion information to the onboard device of the following vehicle by wireless communication. This Based on the congestion information, to inform the traffic jam area to the driver by notifying means and.

A tenth aspect of the present invention provides an overspeed warning system according to the second or seventh aspect, wherein the notifying means is a car navigation device connected to the vehicle-mounted device.

The traffic congestion information providing system according to an eleventh aspect of the present invention is the traffic congestion information providing system according to the third, fourth, fifth, eighth, or ninth aspect, wherein the notifying means is a car navigation device connected to the vehicle-mounted device. There is a feature.

A vehicle speed detection system according to a twelfth aspect of the present invention
In the vehicle speed detection system according to the first or sixth aspect, the vehicle-mounted device is a vehicle-mounted device used in a toll road automatic toll collection system.

A thirteenth invention provides an overspeed warning system according to the second, seventh, or tenth invention, wherein the on-vehicle device is an on-vehicle device used in a toll road automatic toll collection system. And

The traffic congestion information providing system according to a fourteenth aspect of the present invention is the traffic congestion information providing system according to the third, fourth, fifth, eighth, ninth or eleventh aspect of the present invention. It is a vehicle-mounted device used.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an explanatory diagram showing an overall overview of a vehicle speed detection system, an excessive speed warning system using the same, and a delay information providing system according to an embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of a roadside machine. FIG. 3 is a block diagram showing the configuration of the vehicle-mounted device, FIGS. 4 and 5 are explanatory diagrams of a traffic jam information providing system, and FIG. 6 is an explanatory diagram of a vehicle speed detection system.

As shown in FIG. 1, a road 1 such as a highway
The roadside units 2 are installed along the road at a predetermined interval L ₁ (for example, 1 km). In FIG. 1, the vehicle traveling direction F on the road 1 is shown.
Although the upstream roadside units 2 (A point) shows only two downstream roadside units 2 (B point), a number of roadside unit 2 is installed at a predetermined interval L ₁ road 1 along actually ing.

On the other hand, the vehicle 3 running on the road 1 has an on-board unit 4 mounted thereon. The vehicle-mounted device 4 is used in an automatic toll collection system (ETC) for toll roads, and data (ID information) for toll collection by wireless communication with a roadside machine installed on the road side at a tollgate (not shown). , Vehicle type information, tolls, etc.).

The vehicle-mounted device 4 is used not only for the automatic toll collection system for toll roads, but also for detecting the traveling speed of the vehicle 3 and providing information on excessive speed and traffic congestion to the driver.
In other words, the vehicle-mounted device 4 can be operated by adding software to be processed by the CPU to display traffic congestion information and excessive speed information transmitted from the roadside device 2 by character display, voice guidance, buzzer sounding, or LED light emission. Platform that can notify people.

Hereinafter, the vehicle-mounted device 4 will be described with reference to FIGS.
A vehicle speed detection system using the vehicle and the roadside machine 2, and an excessive speed warning system and a congestion information providing system using the same will be described in detail.

<Vehicle speed detection system I> As shown in FIG. 1, a vehicle 3 traveling on a road 1 in a vehicle traveling direction F
Approaches the upstream roadside device 2 installed at the point A, for example, and the wireless communication area L ₂ (5 in the illustrated example) of the roadside device 2.
When the vehicle enters m), the wireless communication between the roadside device 2 and the vehicle-mounted device 4 starts.

At this time, first, a calling signal is transmitted from the roadside device 2 to the vehicle-mounted device 4. That is, as shown in FIG. 2, in the roadside device 2, an ASK (Amplitude Shift Keying: amplitude modulation) modulator 1 converts a call signal generated in the CPU 15 as transmission data a via the communication control circuit 34.
8 is output. The ASK modulator 18 generates an amplitude-modulated wave b by amplitude-modulating the carrier based on the transmission data (call signal) a, and transmits the amplitude-modulated wave b to the vehicle-mounted device 4 via the transmission antenna 12. .

The vehicle-mounted device 4 receives the amplitude-modulated wave b transmitted from the roadside device 2 via the receiving antenna 31,
Received data (call signal) demodulated by ASK demodulator 33
Obtain c. The received data (call signal) c is output to the CPU 35 via the communication control circuit 34. CPU35
Then, when receiving data (call signal) c is input, a response signal is generated. This response signal is output to the ASK modulator 39 as transmission data d via the communication control circuit 34. The ASK modulator 39 generates an amplitude-modulated wave e by amplitude-modulating the carrier based on the transmission data (response signal) d, and transmits the amplitude-modulated wave e to the transmitting antenna 3.
2 to the roadside device 2.

Subsequently, the roadside device 2 receives the amplitude-modulated wave e transmitted from the vehicle-mounted device 4 via the receiving antenna 11 and demodulates the received data (response signal) f by the ASK demodulator 13. obtain. The received data (response signal) f is output to the CPU 15 via the communication control circuit 14. Then, when receiving data (response signal) f is input, the CPU 15 counts the number of times of communication as one and generates a call signal again.

[0031] After that, the wireless communication with a predetermined period between a roadside unit 2 and the vehicle-mounted device 4 between the in the same manner as described above the vehicle 3 (OBE 4) is located in the wireless communication area L ₂ Exchange (transmit and receive a call signal and a response signal). Then, the CPU 15 of the roadside device 2 counts up the number of communications twice, three times,... Each time a response signal is received from the vehicle-mounted device 4. Thus, it is seen how it was possible to exchange the number of times the vehicle-mounted device 4 and the wireless communication in the wireless communication area L ₂ is.

Then, the CPU 15 of the roadside unit 2 calculates the traveling speed of the vehicle 3 based on the number of communications thus obtained. That is, the wireless communication area L ₂ is constant, and
Since the roadside device 2 and the on-vehicle device 4 exchange wireless communication at a constant cycle, the number of communication changes according to the vehicle speed. For example, the speed changes 10 times when the vehicle speed is 100 km / h, and 100 times when the vehicle speed is 10 km / h. Therefore, the vehicle speed can be calculated based on the number of times of communication.

Moreover, according to this vehicle speed detection system,
Since the traveling speed of the vehicle 3 is detected by wireless communication between the on-vehicle device 4 and the roadside device 2, the cost is lower than when a large number of speed detection sensors such as ultrasonic sensors are installed on the road side. Furthermore, since the vehicle-mounted device 4 is used in an automatic toll road toll collection system, the cost can be further reduced by using this.

<Overspeed Warning System I> Further, the upstream roadside unit 2 compares the running speed of the vehicle 3 calculated by the CPU 15 with a predetermined speed threshold value, and determines that the running speed of the vehicle 3 is too high. It is determined whether or not there is, and if it is determined that the speed is excessive, excess speed information is generated. The speed threshold in this case is the speed limit of the road 1 or a speed near the speed limit. When the speed of the vehicle 3 exceeds the speed threshold, it is determined that the speed is excessive. The speed excess information is transmitted from the roadside device communication device 16 of the upstream roadside device 2 to the roadside device communication device 16 of the downstream roadside device 2 at the point B via the signal cable 17. The signal cable 17
For example, a power cable for supplying power to each roadside device 2 may be used. In this case, there is no need to wire a dedicated signal cable, so that equipment costs can be reduced.

Then, the downstream roadside device 2 transmits the excess speed information transmitted from the upstream roadside device 2 to the CPU 15.
From the ASK modulator 18 as transmission data a. The ASK modulator 18 generates an amplitude modulation wave b based on the transmission data (excess speed information) a, and transmits the amplitude modulation wave b to the vehicle-mounted device 4 via the transmission antenna 12. The speed excess information at this time is, for example, data representing "slow speed" represented by an ASCII code or the like.

The determination as to whether or not the speed is excessive may be made by the downstream roadside unit 2. That is, the traveling speed calculated by the upstream roadside machine 2 is transmitted from the upstream roadside machine 2 to the downstream roadside machine 2, and the traveling speed is compared with the speed threshold value by the CPU 15 of the downstream roadside machine 2. It is determined whether it is in excess. As a result, when it is determined that the speed is excessive, the excess speed information is output to the ASK modulator 18 as the transmission data a in the same manner as described above, and the ASK modulator 18 transmits the transmission data (excess speed information) a An amplitude modulation wave b is generated on the basis of the amplitude modulation wave b, and the amplitude modulation wave b is transmitted to the vehicle-mounted device 4 via the transmission antenna 12.

The vehicle-mounted device 4 receives the amplitude-modulated wave b transmitted from the downstream roadside device 2 by any of the above means via the receiving antenna 31 and demodulates the received data (ASK demodulator 33). Overspeed information) c is obtained. The received data (excess speed information) c is output to the CPU 35 via the communication control circuit 34. The CPU 35 processes the received data (excess speed information) c, and displays an overspeed warning on the display 3 for displaying the toll. Thus, the driver is notified of the overspeed warning. As a result, the driver can be notified of the excessive speed warning at any time,
Safe driving can be achieved. In addition, as the notification means, the display 3
However, the present invention is not limited to this.

Further, as shown in FIG.
PU 35 and a so-called car navigation device 36 that assists the driver by displaying a road map, a vehicle position, and the like,
A large display screen 37 of the car navigation device 36 is provided by connecting and connecting the interfaces to each other.
To alert the driver, or, if the car navigation device 36 has a voice guidance function or a buzzer sounding function, use these functions to issue an excessive speed warning to the driver. May be notified. By using the car navigation device 36 in this manner, it is possible to further reduce costs and the like.

<Congestion Information Providing System I> Each of the roadside units 2 uses the traveling speed data of the preceding vehicle 3 stored in the roadside unit 2 detected a predetermined time (for example, 10 to 30 minutes) before the subsequent vehicle. It transmits to the vehicle-mounted device 4 of the vehicle 3 by wireless communication. Then, the vehicle-mounted device 4 of the succeeding vehicle 3 determines whether or not there is a traffic jam based on the traveling speed of the preceding vehicle 3 and notifies the driver of the traffic jam information by the notification means.

More specifically, the traveling speed data of the preceding vehicle 3 stored in the memory 19 of the roadside device 2 a predetermined time ago is stored in C
The PU 15 outputs the transmission data a to the ASK modulator 18, and the ASK modulator 18 generates an amplitude modulation wave b based on the transmission data (running speed) a, and transmits the amplitude modulation wave b to the transmission antenna 12. The vehicle-mounted device 4 of the following vehicle via
Send to

The vehicle-mounted device 4 of the following vehicle 3 transmits the amplitude modulated wave b transmitted from the downstream roadside device 2 to the receiving antenna 3.
1 and demodulated by an ASK demodulator 33 to obtain received data (running speed) c. The received data (running speed) c is input to the CPU 35. The CPU 35 determines whether or not there is traffic congestion by comparing the received data (running speed) c with the speed threshold value. The speed threshold value in this case is, for example, about 10 to 30 km / h, and when the traveling speed of the preceding vehicle 3 falls below this speed threshold value, it is determined that there is a traffic jam.

Then, the vehicle-mounted device 4 of the following vehicle 3 displays the traffic congestion information (for example, a message of “jutai”) on the display device 3 in characters. Thus, the driver is notified of the overspeed warning. Note that the notification means is not limited to the display 3 as in the case of the overspeed alarm system, but may be voice guidance,
A buzzer sound or LED light emission may be used, and furthermore, congestion information is displayed on the display screen 37 of the car navigation device 36 to notify the driver, or a voice guidance function or a buzzer sound function is provided to the car navigation device 36. If such a function is provided, these functions may be used to notify the driver of the traffic jam information. This allows the driver to avoid danger in response to short-distance traffic jams.

The determination as to whether or not there is congestion may be made in the roadside unit 2. That is, the CPU 15 of the roadside machine 2 determines whether or not there is a traffic jam based on the traveling speed of the preceding vehicle 3 a predetermined time before. If it is determined that there is a traffic jam, the ASK modulator 18 uses the traffic information as the transmission data a. The ASK modulator 18 generates an amplitude-modulated wave b based on the transmission data (congestion information) a, and transmits the amplitude-modulated wave b via the transmission antenna 12 to the on-board device of the following vehicle of the following vehicle 3 Send to 4. Note that the traffic congestion information at this time is, for example, data "10" expressed by an ASCII code or the like.

In the vehicle-mounted device 4 of the following vehicle, the downstream roadside device 2
The amplitude modulated wave b transmitted from the
And demodulated by the ASK demodulator 33 to obtain received data (congestion information) c. This received data (congestion information)
c is input to the CPU 35, and the CPU 35 processes the received data (congestion information) c, and transmits the congestion information to the driver by the notification means such as the display 38 and the car navigation device 37 in the same manner as described above. Notice.

By the way, in the congestion information providing system as described above, the congestion range cannot be known.
It is insufficient when the congestion range is expanded in the anti-vehicle traveling direction (upstream direction). That is, as conceptually shown in FIG. 4, the traffic congestion range E where the density of vertical lines matching the vehicle is high
Is effective when moving in the vehicle traveling direction (downstream direction) F, but the traffic congestion range E is expanded in the anti-vehicle traveling direction (upstream direction) G because the traffic congestion range E cannot be known. In such a case, it is insufficient.

Therefore, as shown by an arrow H in FIG. 4, from the downstream roadside machine 2 to the upstream roadside machine 2 in the vehicle traveling direction F,
The traveling speed of the preceding vehicle 3 calculated by each roadside device 2 is sequentially transmitted via the signal cable 17. Then, the upstream roadside device 2 determines the congestion range E based on these traveling speeds, and transmits the congestion information to the vehicle-mounted device 4 of the following vehicle 3 by wireless communication.

For example, in the roadside machine 2 installed at the K point on the road 1, the CPU 15 determines the congestion range E based on the traveling speed data sequentially sent from each downstream roadside machine 2, and determines the traffic congestion range E. A as information for transmission data a
Output to the SK modulator 18. The ASK modulator 18 generates an amplitude modulation wave b based on the transmission data (congestion information) a, and transmits the amplitude modulation wave b to the vehicle-mounted device 4 via the transmission antenna 12. The traffic congestion information in this case is, for example, data “3 kilometers before” expressed by an ASCII code or the like.

The vehicle-mounted device 4 receives the amplitude-modulated wave b transmitted from the downstream roadside device 2 via the receiving antenna 31 and demodulates it with the ASK demodulator 33 to obtain received data (congestion information) c. This received data (congestion information) c is
The received data (congestion information) c is processed by the CPU 35 and the display 38 is displayed in the same manner as described above.
And notification means such as the car navigation device 37
The driver is notified of the congestion range E. As a result, the driver can more reliably cope with a short-distance traffic jam and avoid danger.

In the above case, the downstream roadside machine 3
Since the transmission of the traveling speed data from the roadside machine 2 to the upstream roadside machine 2 is performed via the communication cable 17, it is necessary to wire a long distance communication cable 17 between the upstream and downstream roadside machines 2.
For this reason, equipment costs are required. On the other hand, if the vehicle 3 carries the traveling speed data, the upstream roadside machine 3 and the downstream roadside machine 3 need not be wired with the communication cable 17, so that the upstream roadside machine 3 and Since traveling speed data can be transmitted to the roadside device 2, cost reduction can be achieved.

More specifically, first, as indicated by an arrow X in FIG. 5, the traveling speed of the vehicle 3A calculated by the roadside machine 2A at the point S in one lane 1A (vehicle traveling direction F) is calculated by using the one The signal is transmitted from the roadside machine 2A in the lane 1A to the roadside machine 2B in the opposite lane 1B (vehicle traveling direction M) at the same S point as the roadside machine 2A.

The transmission at this time is performed by wireless communication.
That is, in the roadside machine 2A in the lane 1A, the traveling speed is output from the CPU 15 to the ASK modulator 18 as transmission data a,
In the ASK modulator 18, the transmission data (running speed) a
, And transmits the amplitude-modulated wave b to the vehicle-mounted device 4 via the transmission antenna 12. The roadside machine 2B in the lane 1B receives the amplitude-modulated wave b transmitted from the roadside machine 2A via the receiving antenna 11 and demodulates it with the ASK demodulator 13 to obtain received data (running speed) f. . This received data (running speed) f
15 and stored in the memory 19.

Next, the traveling speed of the vehicle 3A is transmitted by radio communication from the roadside machine 2B in the oncoming lane 1B to the onboard device 4B of the vehicle 3B running in the oncoming lane 1B, and the onboard device 4B is transmitted.
To memorize. That is, the traveling speed is output from the CPU 15 of the roadside device 2B to the ASK modulator 18 as transmission data a, and
The SK modulator 18 generates an amplitude modulation wave b based on the transmission data (running speed) a, and transmits the amplitude modulation wave b to the vehicle-mounted device 4B via the transmission antenna 12. Then, the vehicle-mounted device 4B receives the amplitude-modulated wave b transmitted from the roadside device 2B via the reception antenna 31, and executes AS
Demodulated by the K demodulator 33 to obtain received data (running speed) f. The received data (running speed) f is stored in the memory 40 via the CPU 35.

Next, as shown by an arrow Y in FIG. 5, the vehicle 3B travels in the oncoming lane 1B and is stored in the on-board unit 4B in the vehicle traveling direction M downstream of the oncoming lane 1B.
A carries the traveling speed data of the vehicle A, and the vehicle-mounted device 4B of the vehicle 3B
From the downstream roadside machine 2C in the vehicle traveling direction M in the oncoming lane 1B
To be transmitted by wireless communication. That is, C of the vehicle-mounted device 4B
The running speed is output from the PU 35 to the ASK modulator 39 as transmission data d, and the ASK modulator 39 generates an amplitude modulation wave e based on the transmission data (running speed) d, and transmits the amplitude modulation wave e to the transmission antenna. Roadside machine 2C via
Send to Then, the roadside device 2C receives the amplitude-modulated wave e transmitted from the on-vehicle device 4B via the receiving antenna 11, and demodulates with the ASK demodulator 13 to obtain received data (running speed) f.

Next, as shown by an arrow Z in FIG. 5, an upstream roadside in the vehicle traveling direction F of one lane 1A from the downstream roadside machine 2C of the opposite lane 1B at the same point T as the roadside machine 2C. The traveling speed data of the vehicle 3A is sent to the machine 2D.
Specifically, this is the same as the case where the traveling speed data is transmitted from the roadside device 2A to the roadside device 2B, and thus a specific description is omitted here. Note that data transmission between the roadside devices at the same point (data transmission from the roadside device 2A to the roadside device 2B, data transmission from the roadside device 2C to the roadside device 2D, etc.) is not necessarily limited to wireless communication, It may be performed via a cable.

Thus, the traveling speed of the vehicle 3A and the like is transmitted to the downstream roadside machine 2D of the lane 1A from the downstream roadside machine 2A and the like of the lane 1A one after another by the vehicle 3 of the opposite lane 1B.

The subsequent steps are the same as those in the case where the traveling speed data is transmitted via the signal cable 17 described above. That is, based on the traveling speed of the vehicle 3A sent from the downstream roadside machine 2A or the like of the one lane 1A to the upstream roadside machine 2D in this manner, the one of the upstream roadside machine 2D of the one lane 1A The traffic congestion range E of this lane is determined, and this traffic congestion information is transmitted by radio communication to the vehicle-mounted device 4C of the vehicle 3C traveling on one lane 1A. The vehicle-mounted device 4C uses the display 38 and the car navigation device 3 based on the traffic congestion information.
The driver is informed of the congestion area by a notification means such as 7.

<Vehicle Speed Detection System II> By the way, as a vehicle speed detection system by wireless communication between the on-vehicle device 4 and the roadside device 2, in addition to the above, as shown in FIG.
May be a system that detects the traveling speed of the vehicle 3 based on the vehicle speed.

Referring to FIG. 1 to FIG. 4 and FIG. 6, the roadside machine 2 installed at a predetermined interval along the road 1 will be described.
Communicates sequentially with the vehicle-mounted device 4 mounted on the traveling vehicle 3 on the road 1 to obtain a communication time.

More specifically, the roadside device 2 outputs the call signal generated in the CPU 15 to the ASK modulator 18 as transmission data a via the communication control circuit 34.
In the ASK modulator 18, the transmission data (call signal)
a based on the amplitude-modulated wave b
Is transmitted via the transmission antenna 12.

The vehicle-mounted device 4 receives the amplitude-modulated wave b transmitted from the roadside device 2 via the receiving antenna 31,
Received data (call signal) demodulated by ASK demodulator 33
Obtain c. The received data (call signal) c is output to the CPU 35 via the communication control circuit 34. CPU35
Then, when receiving data (call signal) c is input, a response signal is generated. This response signal is output to the ASK modulator 39 as transmission data d via the communication control circuit 34. The ASK modulator 39 generates an amplitude modulation wave e based on the transmission data (response signal) d, and transmits the amplitude modulation wave e via the transmission antenna 32.

The roadside device 2 receives the amplitude-modulated wave e transmitted from the vehicle-mounted device 4 via the receiving antenna 11,
Received data (response signal) f demodulated by ASK demodulator 13
Get. The received data (call signal) f is output to the CPU 15 via the communication control circuit 14. The CPU 15 receives the reception data (call signal) f and recognizes the time at this time as the communication time with the vehicle-mounted device 4.

Then, for example, the communication time t ₁ with the vehicle-mounted device 4 of the upstream roadside machine 2 is transmitted from the upstream roadside machine 2 at the point A to the downstream roadside machine 2 at the point B, and the C of the downstream roadside machine 2 is transmitted.
In the PU 15, the communication time t at the upstream roadside device 2 is
₁ and the communication time t between the downstream roadside device 2 and the vehicle-mounted device 4
₂ to determine the communication time difference Δt, and calculate the traveling speed of the vehicle 3 based on the communication time difference Δt. That is, since the interval between the roadside devices 2 is constant, the communication time difference Δt changes according to the vehicle speed, so that the vehicle speed can be calculated based on the communication time difference Δt.

Further, since the traveling speed of the vehicle 3 is detected by wireless communication between the on-vehicle device 4 and the roadside device 2, the cost is lower than when a large number of speed detection sensors such as ultrasonic sensors are installed on the road side. . Furthermore, since the vehicle-mounted device 4 is used in an automatic toll road toll collection system, the cost can be further reduced by using this.

<Overspeed Warning System II> When the traveling speed of the vehicle 3 is detected as described above, the overspeed information is provided to the driver as in the case of the above-mentioned overspeed warning system I.

That is, the CPU 15 of the downstream roadside device 2
A comparison is made between the calculated traveling speed of the vehicle 3 and the speed threshold value to determine whether the speed is excessive. As a result, when it is determined that the speed is excessive, the excess speed information is output to the ASK modulator 18 as transmission data a, and the ASK modulator 18
Generates an amplitude-modulated wave b based on the transmission data (excess speed information) a, and transmits the amplitude-modulated wave b to the transmitting antenna 12.
To the in-vehicle device 4 via the.

The vehicle-mounted device 4 receives the amplitude-modulated wave b transmitted from the downstream roadside device 2 via the receiving antenna 31 and demodulates the received data (excess speed information) c by the ASK demodulator 33. obtain. This received data (overspeed information) c
Is output to the CPU 35 via the communication control circuit 34.
The CPU 35 processes the received data (excess speed information) c, and displays an overspeed warning on the display 3 as a character. Thus, the driver is notified of the overspeed warning. As a result, the driver can be notified of the excessive speed warning at any time,
Safe driving can be achieved.

The notification means is not limited to the display 3, but may be voice guidance, buzzer sounding, LED light emission, or the like. Further, the vehicle-mounted device 4 and the car navigation device 3
6, the car navigation device 36 has a large display screen 37 to display an excessive speed warning and notify the driver, or the car navigation device 36 has a voice guidance function, a buzzer sounding function, and the like. In such a case, these functions may be used to notify the driver of an overspeed warning. By using the car navigation device 36, the cost can be further reduced.

<Congestion Information Providing System II> Further, as in the case of the above-described congestion information providing system I, a congestion information provision is provided to the driver.

That is, in each of the roadside units 2, the roadside unit 2
The traveling speed of the preceding vehicle 3 detected a predetermined time (for example, 10 to 30 minutes) stored in the vehicle 3 is transmitted to the vehicle-mounted device 4 of the succeeding vehicle 3 by wireless communication. Then, the vehicle-mounted device 4 of the succeeding vehicle 3 determines whether or not there is a traffic jam based on the traveling speed of the preceding vehicle 3 and notifies the driver of the traffic jam information by the notification means.

Specifically, the running speed of the preceding vehicle 3 stored in the memory 19 of the roadside device 2 a predetermined time before is stored in the CPU 1.
5 to the ASK modulator 18 as transmission data a, the ASK modulator 18 generates an amplitude modulation wave b based on the transmission data (running speed) a, and transmits the amplitude modulation wave b to the transmission antenna 12. The vehicle-mounted device 4 of the following vehicle 3 via
Send to

The vehicle-mounted device 4 of the following vehicle 3 transmits the amplitude modulated wave b transmitted from the downstream roadside device 2 to the receiving antenna 3.
1 and demodulated by an ASK demodulator 33 to obtain received data (running speed) c. The received data (running speed) c is output to the CPU 35 via the communication control circuit 34. The CPU 35 determines whether or not there is traffic congestion by comparing the received data (running speed) c with the speed threshold value.
The speed threshold value in this case is, for example, 10 to 30 km.
/ H, and when the traveling speed of the preceding vehicle 3 falls below this speed threshold value, it is determined that there is a traffic jam.

Then, the vehicle-mounted device 4 of the following vehicle 3 displays the traffic congestion information (for example, a message of "jutai") on the display device 3 in characters. Thus, the driver is notified of the overspeed warning. Note that the notification means is not limited to the display 3 as in the case of the overspeed warning, but may be voice guidance, buzzer sounding, LED light emission, or the like. Further, the congestion information is displayed on the display screen 37 of the car navigation device 36. Is displayed to notify the driver, or when the car navigation device 36 is provided with a voice guidance function, a buzzer sounding function, and the like, these functions are used to notify the driver of congestion information. You may. This allows the driver to avoid danger in response to short-distance traffic jams.

The determination as to whether or not there is congestion may be made in the roadside unit 2. That is, the CPU 15 of the roadside machine 2 determines whether or not there is traffic congestion based on the traveling speed of the preceding vehicle 3 a predetermined time before.
Output to the ASK modulator 18 as transmission data a,
The modulator 18 generates an amplitude modulation wave b based on the transmission data (congestion information) a, and transmits the amplitude modulation wave b to the vehicle-mounted device 4 via the transmission antenna 12. The traffic congestion information at this time is, for example, data indicating "jutai" expressed by an ASCII code or the like.

The vehicle-mounted device 4 receives the amplitude-modulated wave b transmitted from the downstream roadside device 2 via the receiving antenna 31 and demodulates it with the ASK demodulator 33 to obtain received data (congestion information) c. . The received data (congestion information) c is output to the CPU 35 via the communication control circuit 34. CPU3
In step 5, the received data (congestion information) c is processed, and the congestion information is notified to the driver by the notification means such as the display 38 and the car navigation device 37 in the same manner as described above.

Further, the above congestion information providing system is effective when the congestion range is moving in the vehicle traveling direction (downstream direction). However, since the congestion range cannot be known, the congestion range is not In the case where the vehicle is expanding in the vehicle traveling direction (upstream direction), it is insufficient. Therefore, as shown by an arrow H in FIG.
To the upstream roadside machine 2 via the signal cable 17
The traveling speed calculated by each roadside unit 2 is transmitted, and the upstream roadside unit 2 determines the congestion range E based on these traveling speeds, and transmits the congestion information E to the vehicle-mounted device 4 by wireless communication. .

For example, in the roadside machine 2 installed at the K point on the road 1, the CPU 15 determines the congestion range E based on the traveling speed data of the preceding vehicle 3 sequentially sent from each downstream roadside machine 2. The congestion information is output to the ASK modulator 18 as transmission data a. The ASK modulator 18 generates an amplitude modulation wave b based on the transmission data (congestion information) a and transmits the amplitude modulation wave b to the vehicle-mounted device 4 of the following vehicle 3 via the transmission antenna 12. The traffic congestion information in this case is, for example, data “3 kilometers before” expressed by an ASCII code or the like.

In the vehicle-mounted device 4 of the following vehicle 3, the amplitude modulated wave b transmitted from the downstream roadside device 2 is received by the receiving antenna 31.
And demodulated by the ASK demodulator 33 to obtain received data (congestion information) c. This received data (congestion information)
c is output to the CPU 35 via the communication control circuit 34. The CPU 35 processes the received data (congestion information) c, and notifies the driver of the congestion range E by the notification means such as the display 38 and the car navigation device 37 as in the above case. As a result, the driver can more reliably cope with a short-distance traffic jam and avoid danger.

[0078]

As described above in detail with the embodiments of the present invention, the vehicle speed detecting system according to the first aspect of the present invention installs roadside units at predetermined intervals along a road, and these roadside units By repeatedly exchanging wireless communication with the vehicle-mounted device of the vehicle traveling on the road at a fixed cycle in the wireless communication area and counting the number of communications, it is possible to exchange the wireless communication with the vehicle-mounted device several times in each wireless communication area It is characterized in that it is determined whether or not the communication has been completed, and the running speed of the vehicle is calculated based on the number of communications.

Therefore, according to the vehicle speed detection system of the first invention, since the running speed of the vehicle is detected by wireless communication between the vehicle-mounted device and the roadside device, a number of speed detection sensors such as ultrasonic sensors are installed on the road side. The cost is lower than in the case of

Further, the overspeed warning system according to the second aspect of the present invention provides a roadside device at predetermined intervals along a road, and the roadside device is provided with an onboard device of a vehicle traveling on the road in each wireless communication area. By repeatedly exchanging wireless communication at a fixed cycle and counting the number of communication times, it is determined how many times the wireless communication with the on-vehicle device can be performed in each wireless communication area, and based on the number of communication times, the traveling speed of the vehicle is determined. The upstream roadside machine in the traveling direction of the vehicle determines whether or not the calculated traveling speed is overspeed and transmits the overspeed information to the downstream roadside machine in the traveling direction of the vehicle, and the downstream roadside machine Then, this speed excess warning is transmitted to the vehicle-mounted device by wireless communication, or the traveling speed calculated by the upstream roadside machine is transmitted from the upstream roadside machine to the downstream roadside machine, and the downstream roadside machine transmits the traveling speed calculated by the upstream roadside machine. It is determined whether or not the traveling speed is excessive speed, and the excessive speed information is transmitted to the vehicle-mounted device by wireless communication. Is notified.

Therefore, according to the overspeed warning system of the second invention, the driver can be notified of the overspeed warning at any time, and safe driving can be achieved.

In the traffic congestion information providing system according to the third aspect of the present invention, roadside devices are installed at predetermined intervals along a road, and these roadside devices are connected to an on-vehicle device of a vehicle traveling on the road in each wireless communication area. By repeatedly exchanging wireless communication at a fixed cycle and counting the number of communication times, it is determined how many times the wireless communication with the on-vehicle device can be performed in each wireless communication area, and based on the number of communication times, the traveling speed of the vehicle is determined. , The respective roadside units transmit the traveling speed of the preceding vehicle detected a predetermined time ago to the vehicle-mounted device of the following vehicle by wireless communication, or determine whether or not there is a traffic jam based on the traveling speed of the preceding vehicle. And transmitting the congestion information to the on-board unit of the following vehicle by wireless communication. The on-board unit of the following vehicle transmits the traveling speed of the preceding vehicle transmitted from the downstream roadside unit. It is determined whether a traffic jam based on, or based on the traffic jam information sent from the downstream side roadside device, to notify the congestion information to the driver by notifying means and.

Therefore, according to the traffic congestion information providing system of the third invention, the driver can avoid danger in response to short-distance traffic congestion.

The traffic congestion information providing system according to the fourth aspect of the present invention has roadside devices installed at predetermined intervals along a road, and these roadside devices are provided with an onboard device of a vehicle traveling on the road in each wireless communication area. By repeatedly exchanging wireless communication at a fixed cycle and counting the number of communication times, it is determined how many times the wireless communication with the on-vehicle device can be performed in each wireless communication area, and based on the number of communication times, the traveling speed of the vehicle is determined. Is transmitted from the downstream roadside machine in the vehicle traveling direction to the upstream roadside machine, the traveling speed of the preceding vehicle calculated by each roadside machine is transmitted, and the upstream roadside machine congests based on these traveling speeds. Judging the range, transmitting this traffic information to the onboard device of the following vehicle by wireless communication, the onboard device of the following vehicle, based on this traffic information,
The driver is informed of the congested area by the notifying means.

Therefore, according to the traffic congestion information providing system of the fourth invention, the driver can more reliably cope with short-distance traffic congestion and avoid danger.

In the traffic jam information providing system according to the fifth aspect of the present invention, roadside devices are installed at predetermined intervals along a road, and these roadside devices are connected to an on-vehicle device of a vehicle traveling on the road in each wireless communication area. By repeatedly exchanging wireless communication at a fixed cycle and counting the number of communication times, it is determined how many times the wireless communication with the on-vehicle device can be performed in each wireless communication area, and based on the number of communication times, the traveling speed of the vehicle is determined. The traveling speed of the preceding vehicle calculated by the roadside machine in one lane is transmitted from the roadside machine in one lane to the roadside machine in the oncoming lane at the same point as this roadside machine, and From the roadside machine to the vehicle-mounted device of the vehicle running in the oncoming lane by wireless communication and stored in the vehicle-mounted device, and this vehicle travels in the oncoming lane to the downstream side in the vehicle traveling direction of the oncoming lane. And, by wireless communication from the on-board unit of the vehicle in the opposite lane to the downstream roadside machine in the vehicle traveling direction of the oncoming lane, one lane at the same point as the roadside machine from the downstream roadside machine in the oncoming lane To the upstream roadside machine in the vehicle traveling direction, and based on the traveling speed of the preceding vehicle sent from the downstream roadside machine to the upstream roadside machine in one lane in this way, The side roadside unit determines the congestion range of one lane, and transmits this congestion information to the on-board unit of the following vehicle traveling on one lane by wireless communication. Based on the notification, the driver is notified of the congestion range by the notification means.

Therefore, according to the traffic congestion information providing system of the fifth invention, even if a communication cable is not provided between the upstream roadside machine and the downstream roadside machine, the communication from the downstream roadside machine to the upstream roadside machine can be performed. And traveling speed data, the cost can be reduced.

In the vehicle speed detection system according to the sixth aspect of the present invention, roadside devices are installed at predetermined intervals along a road, and these roadside devices sequentially communicate with a vehicle-mounted device of a vehicle running on the road, The communication time with the vehicle-mounted device in the upstream roadside machine is transmitted from the upstream roadside machine in the vehicle traveling direction to the downstream roadside machine, and in the downstream roadside machine, the communication time of this upstream roadside machine and the downstream roadside machine A communication time difference is obtained from the communication time with the on-vehicle device, and a traveling speed of the vehicle is calculated based on the communication time difference.

Therefore, according to the vehicle speed detection system of the sixth invention, since the traveling speed of the vehicle is detected by wireless communication between the vehicle-mounted device and the roadside device, a number of speed detection sensors such as ultrasonic sensors are installed on the road side. The cost is lower than in the case of

Further, in the overspeed warning system according to the seventh aspect of the present invention, roadside devices are installed at predetermined intervals along a road, and these roadside devices sequentially communicate with a vehicle-mounted device of a vehicle traveling on the road by wireless communication. The communication time with the vehicle-mounted device in the upstream roadside machine is transmitted from the upstream roadside machine in the vehicle traveling direction to the downstream roadside machine, and the communication time of the upstream roadside machine and the downstream roadside machine are transmitted to the downstream roadside machine. A communication time difference is determined from the communication time with the on-vehicle device in the above, and the traveling speed of the vehicle is calculated based on the communication time difference.
Determining whether or not the calculated traveling speed is overspeed and transmitting the overspeed information to the vehicle-mounted device by wireless communication,
The vehicle-mounted device is characterized by notifying the driver of an overspeed warning by the notification means based on the overspeed information.

Therefore, according to the overspeed warning system of the seventh invention, the driver can be notified of the overspeed warning at any time, and safe driving can be achieved.

In the traffic information providing system according to the eighth invention, roadside devices are installed at predetermined intervals along a road, and these roadside devices sequentially communicate with a vehicle-mounted device of a vehicle traveling on a road by wireless communication. The communication time with the vehicle-mounted device in the upstream roadside machine is transmitted from the upstream roadside machine in the vehicle traveling direction to the downstream roadside machine, and the communication time of the upstream roadside machine and the downstream roadside machine are transmitted to the downstream roadside machine. Determining a communication time difference from the communication time with the on-vehicle device, and calculating a traveling speed of the vehicle based on the communication time difference.In each of the roadside units, the traveling speed of the preceding vehicle detected a predetermined time ago is determined by the following vehicle. To be transmitted to the on-board unit by wireless communication, or
Based on the traveling speed of the preceding vehicle, it is determined whether or not there is congestion, and the congestion information is transmitted by wireless communication to the on-vehicle device of the following vehicle. In the on-vehicle device of the following vehicle, the preceding vehicle transmitted from the downstream roadside device is transmitted. Determining whether or not there is congestion based on the traveling speed of the vehicle, or notifying the driver of the congestion information by the notification means based on the congestion information transmitted from the downstream roadside machine. .

Therefore, according to the traffic jam information providing system of the eighth aspect, the driver can avoid danger in response to a short-distance traffic jam.

In the traffic information providing system according to the ninth aspect of the present invention, the roadside devices are installed at predetermined intervals along the road, and these roadside devices sequentially exchange wireless communication with the vehicle-mounted device of the vehicle traveling on the road. The communication time with the vehicle-mounted device in the upstream roadside machine is transmitted from the upstream roadside machine in the vehicle traveling direction to the downstream roadside machine, and the communication time of the upstream roadside machine and the downstream roadside machine are transmitted to the downstream roadside machine. Determining a communication time difference from the communication time with the on-vehicle device, calculating the traveling speed of the vehicle based on the communication time difference, and calculating the preceding vehicle calculated from the downstream roadside machine to the upstream roadside machine by each roadside machine. The upstream roadside machine determines the congestion range based on these traveling speeds and transmits this congestion information to the onboard device of the following vehicle by wireless communication. This Based on the congestion information, to inform the traffic jam area to the driver by notifying means and.

Therefore, according to the traffic jam information providing system of the ninth aspect, the driver can more reliably avoid danger in response to a short-distance traffic jam.

[0096] A tenth aspect of the present invention provides an overspeed alarm system according to the second or seventh aspect, wherein the notifying means is a car navigation device connected to the vehicle-mounted device.

Therefore, according to the overspeed warning system of the tenth aspect, the cost can be further reduced by using the car navigation device.

The traffic congestion information providing system according to an eleventh aspect of the present invention is the traffic congestion information providing system according to the third, fourth, fifth, eighth, or ninth aspect, wherein the notifying means is a car navigation device connected to the vehicle-mounted device. There is a feature.

Therefore, according to the traffic congestion information providing system of the eleventh invention, the cost can be further reduced by using the car navigation device.

Further, the vehicle speed detection system according to the twelfth aspect of the present invention
In the vehicle speed detection system according to the first or sixth aspect, the vehicle-mounted device is a vehicle-mounted device used in a toll road automatic toll collection system.

Therefore, according to the vehicle speed detecting system of the twelfth aspect, the cost can be further reduced by using the vehicle-mounted device used in the toll road automatic toll collection system.

A thirteenth invention provides an overspeed warning system according to the second, seventh, or tenth invention, wherein the on-vehicle device is an on-vehicle device used in a toll road automatic toll collection system. And

Therefore, according to the overspeed warning system of the thirteenth aspect, the cost can be further reduced by using the vehicle-mounted device used in the toll road automatic toll collection system.

The traffic congestion information providing system according to the fourteenth invention is the traffic congestion information providing system according to the third, fourth, fifth, eighth, ninth or eleventh invention. It is a vehicle-mounted device used.

Therefore, according to the traffic congestion information providing system of the fourteenth aspect, the cost can be further reduced by using the vehicle-mounted device used in the toll road automatic toll collection system.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an overall outline of a vehicle speed detection system, an excessive speed warning system using the same, and a delay information providing system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a roadside device.

FIG. 3 is a block diagram showing a configuration of the vehicle-mounted device.

FIG. 4 is an explanatory diagram of a congestion information providing system.

FIG. 5 is an explanatory diagram of a traffic jam information providing system.

FIG. 6 is an explanatory diagram of a vehicle speed detection system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Road 1A One lane 1B Oncoming lane 2, 2A, 2B, 2C, 2D Roadside machine 3, 3A, 3B, 3C Vehicle 4, 4A, 4B, 4C Onboard equipment 11 Receiving antenna 12 Transmitting antenna 13 ASK demodulator 14 Communication control Circuit 15 CPU 16 Roadside machine communication device 17 Communication cable 18 ASK modulator 19 Memory 31 Receiving antenna 32 Transmitting antenna 33 ASK demodulator 34 Communication control circuit 35 CPU 36 Car navigation device 37 Display screen 38 Display 39 ASK modulator 40 Memory

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G08G 1/09 G08G 1/09 HF term (Reference) 3E027 EA01 EC05 EC08 5C086 AA47 BA22 CA06 CB27 DA40 EA23 EA27 EA41 EA45 FA02 FA06 FA12 FA18 5H180 AA01 BB04 DD04 DD07 EE10 FF22 FF25 FF32

Claims (14)

[Claims] 1. Roadside devices are installed at predetermined intervals along a road, and these roadside devices repeatedly exchange wireless communication with a vehicle-mounted device of a vehicle running on the road at a predetermined cycle in each wireless communication area. The vehicle speed detection is characterized in that by counting the number of times of communication, how many times wireless communication with the vehicle-mounted device can be performed in each wireless communication area, and calculating the running speed of the vehicle based on the number of times of communication. system. 2. Roadside devices are installed at predetermined intervals along a road, and these roadside devices repeatedly exchange wireless communication with a vehicle-mounted device of a vehicle running on the road at a predetermined cycle in each wireless communication area. By counting the number of communication times, it is determined how many times wireless communication with the on-vehicle device can be performed in each wireless communication area, and the traveling speed of the vehicle is calculated based on the number of communication times. The side roadside machine determines whether the calculated traveling speed is overspeed and transmits the overspeed information to the downstream roadside machine in the vehicle traveling direction, and the downstream roadside machine wirelessly transmits this overspeed warning to the onboard unit. Transmitting by communication,
Alternatively, the traveling speed calculated by the upstream roadside machine is transmitted from the upstream roadside machine to the downstream roadside machine, and the downstream roadside machine determines whether or not the traveling speed is excessive, and transmits the excess speed information to the vehicle. An over-speed warning system, comprising: transmitting an over-speed warning to a driver by a notification unit based on the over-speed information in the vehicle-mounted device; 3. Roadside devices are installed at predetermined intervals along a road, and these roadside devices repeatedly exchange wireless communication with a vehicle-mounted device of a vehicle running on the road at a predetermined cycle in each wireless communication area. By counting the number of communication times, it is determined how many times the wireless communication with the vehicle-mounted device can be performed in each wireless communication area, and the traveling speed of the vehicle is calculated based on the number of communication times. Transmitting the traveling speed of the preceding vehicle detected a predetermined time ago to the vehicle-mounted device of the following vehicle by wireless communication, or determining whether or not there is congestion based on the traveling speed of the preceding vehicle, and transmitting the congestion information to the following vehicle. The on-board unit of the following vehicle determines whether or not there is traffic congestion based on the traveling speed of the preceding vehicle transmitted from the downstream roadside unit. Alternatively, based on the traffic jam information transmitted from a downstream side roadside device, traffic information providing system characterized in that, to notify the congestion information to the driver by notifying means. 4. A roadside device is installed at predetermined intervals along a road, and these roadside devices repeatedly exchange wireless communication with a vehicle-mounted device of a vehicle running on the road at a predetermined cycle in each wireless communication area. By counting the number of communication times, it is determined how many times wireless communication with the on-vehicle device can be performed in each wireless communication area, and the traveling speed of the vehicle is calculated based on the number of communication times. The traveling speed of the preceding vehicle calculated by each roadside machine is transmitted from the roadside machine to the upstream roadside machine,
The upstream roadside unit determines the congestion range based on these traveling speeds, and transmits this congestion information to the onboard unit of the following vehicle by wireless communication. The onboard unit of the following vehicle uses the congestion information based on this congestion information. A congestion information providing system for notifying a driver of a congestion range by a notification means. 5. Roadside devices are installed at predetermined intervals along a road, and these roadside devices repeatedly exchange wireless communication with a vehicle-mounted device of a vehicle running on the road at a predetermined cycle in each wireless communication area. By counting the number of communication times, it is determined how many times wireless communication with the vehicle-mounted device can be performed in each wireless communication area, and the traveling speed of the vehicle is calculated based on the number of communication times. The running speed of the preceding vehicle calculated by the machine
A transmission is transmitted from the roadside machine in this one lane to the roadside aircraft in the opposite lane at the same point as this roadside aircraft, and is transmitted by radio communication from the roadside aircraft in the opposite lane to the vehicle-mounted device of the vehicle running in the opposite lane. The vehicle travels in the oncoming lane and is carried downstream in the vehicle traveling direction of the oncoming lane, and is stored in the onboard device of the vehicle in the oncoming lane. To be transmitted from the downstream roadside machine in the opposite lane to the upstream roadside machine in the vehicle traveling direction of one lane at the same point as the roadside aircraft in this way. Based on the traveling speed of the preceding vehicle sent from the downstream roadside machine to the upstream roadside machine, the upstream roadside machine in one lane determines the congestion range of one lane, and uses this traffic congestion information in one lane. To the on-board unit of the following vehicle traveling A congestion information providing system, comprising: transmitting by communication; and, in a vehicle-mounted device of a following vehicle, notifying a driver of a congestion range by a notification unit based on the congestion information. 6. Roadside machines are installed at predetermined intervals along a road, and these roadside machines sequentially communicate with a vehicle-mounted device of a vehicle traveling on a road, and also communicate with an upstream roadside machine in a vehicle traveling direction. The communication time with the vehicle-mounted device in the upstream roadside machine is transmitted to the downstream roadside machine. A vehicle speed detection system for determining a communication time difference and calculating a running speed of a vehicle based on the communication time difference. 7. Roadside machines are installed at predetermined intervals along a road, and these roadside machines sequentially communicate with a vehicle-mounted device of a vehicle traveling on a road, and also communicate with an onboard roadside machine in a vehicle traveling direction. The communication time with the vehicle-mounted device in the upstream roadside device is transmitted to the downstream roadside device, and in the downstream roadside device, the communication time of the upstream roadside device with the communication time with the vehicle-mounted device in the downstream roadside device is determined. Obtain the communication time difference and calculate the traveling speed of the vehicle based on this communication time difference.The downstream roadside unit judges whether the calculated traveling speed is over speed and transmits the over speed information to the on-board unit. An over-speed warning system, wherein the transmission is performed by communication, and the vehicle-mounted device notifies the driver of an over-speed warning by a notification unit based on the over-speed information. 8. Roadside machines are installed at predetermined intervals along a road, and these roadside machines sequentially communicate with a vehicle-mounted device of a vehicle traveling on a road, and also communicate with an upstream roadside machine in a vehicle traveling direction. The communication time with the vehicle-mounted device in the upstream roadside device is transmitted to the downstream roadside device, and in the downstream roadside device, the communication time of the upstream roadside device with the communication time with the vehicle-mounted device in the downstream roadside device is determined. Calculate the communication time difference and calculate the running speed of the vehicle based on the communication time difference. Each roadside device transmits the running speed of the preceding vehicle detected a predetermined time ago to the on-board unit of the following vehicle by wireless communication. Alternatively, it is determined whether or not there is congestion based on the traveling speed of the preceding vehicle, and the congestion information is transmitted by wireless communication to the on-vehicle device of the following vehicle. In the on-vehicle device of the following vehicle, the information is transmitted from the downstream roadside device. Determining whether or not there is congestion based on the traveling speed of the preceding vehicle, or notifying the driver of the congestion information by the notification means based on the congestion information transmitted from the downstream roadside machine. Traffic information providing system. 9. Roadside units are installed at predetermined intervals along a road, and these roadside units sequentially communicate with a vehicle-mounted device of a vehicle traveling on the road, and also communicate with the vehicle on the road from an upstream roadside unit in a vehicle traveling direction. The communication time with the vehicle-mounted device in the upstream roadside device is transmitted to the downstream roadside device, and in the downstream roadside device, the communication time of the upstream roadside device with the communication time with the vehicle-mounted device in the downstream roadside device is determined. Obtain the communication time difference, calculate the traveling speed of the vehicle based on this communication time difference, transmit the traveling speed of the preceding vehicle calculated by each roadside machine from the downstream roadside machine to the upstream roadside machine, and The vehicle determines the congestion range based on these traveling speeds, and transmits the congestion information to the on-board unit of the following vehicle by wireless communication. The on-board unit of the following vehicle notifies the congestion information based on the congestion information. By luck Traffic information providing system characterized in that, to inform the traffic jam area on the person. 10. The overspeed alarm system according to claim 2, wherein the notification means is a car navigation device connected to the vehicle-mounted device. 11. The traffic jam information providing system according to claim 3, wherein the notifying means is a car navigation device connected to the vehicle-mounted device. 12. The vehicle speed detection system according to claim 1, wherein the vehicle-mounted device is a vehicle-mounted device used in a toll road automatic toll collection system. 13. The over-speed warning system according to claim 2, wherein the on-vehicle device is an on-vehicle device used for a toll road automatic toll collection system. 14. The traffic jam information providing system according to claim 3, wherein the vehicle-mounted device is a vehicle-mounted device used in a toll road automatic toll collection system. Delivery system.