JP3473143B2 - In-vehicle communication device and road-to-vehicle optical communication device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention provides information such as traffic information.
Received via the two-way communication device, vehicle ID, destination etc.
In-vehicle communication device that transmits vehicle-side information to the two-way communication device
Regarding the table Further, the present invention relates to the bidirectional communication device.
The present invention relates to a road-to-vehicle optical communication device that performs communication between the vehicle-mounted communication devices .

[0002]

2. Description of the Related Art FIG. 7 is a diagram showing the concept of an in-vehicle communication device.
8 is a diagram showing the installation status of the on-vehicle communication device, and FIG. 9 is a block diagram showing the configuration of the on-vehicle communication device. In FIG. 7 , reference numeral 1 is a road, 2 is a vehicle traveling on the road, and 3 is an infrared ray that modulates traffic congestion information, required time information, etc. sent from a traffic control center installed directly above the lane center of the road 1. The two-way communication device 4 is installed in the room of the vehicle 2 for repeatedly transmitting the vehicle ID, receiving the vehicle ID and the destination information transmitted by infrared rays from the vehicle, and transmitting them to the traffic control center through a dedicated line. The in-vehicle communication device 5 receives the modulated infrared rays from the two-way communication device 3 installed on the road, decodes the information, and displays the received information to the driver by voice. The communication area 6 is a communication area in which infrared rays can be received from the vehicle-mounted communication device 4. In FIG. 8 , 7 is the modulated infrared light transmitted from the bidirectional communication device 3, and 8 is the in-vehicle communication device 4.
Modulated infrared light transmitted from the vehicle, and 9 indicates the front glass of the vehicle 2. In FIG. 9 , reference numeral 10 is a light receiving portion formed of a light receiving element for receiving the modulated infrared ray 7 and converting it into an electric signal, 11 is an amplifying portion for amplifying an output signal of the light receiving portion 10,
2 is an A / D that converts the amplified signal into a digital signal
A conversion unit, 13 is a decoding unit for decoding the encoded digital signal, 14 is a data output unit for outputting the decoded data, and 15 is a device for displaying the data from the data output unit 14 on a driver or for providing voice guidance. An in-vehicle signal processing unit that performs information setting from a driver and a keyboard or a touch panel, 16 is a data input unit that receives a destination input from the in-vehicle signal processing unit 15, a vehicle ID unique to the vehicle 2, and 17 is a receiving unit. An encoder unit that encodes the encoded data, 18 is a drive unit that drives a current based on the encoded signal, and 19 is L that emits light by the driven current.
The light emitting part comprised by ED is shown.

Next, the operation will be described. In FIG. 10 , a is data provided by the two-way communication device 3, a data transmission rate is 1 Mbps, a data amount of 10 kbytes is divided into 80 frames and repeatedly transmitted at 128 bytes per frame, and b is from the vehicle. Vehicle I to send
D, destination data, etc. are shown, and data is transmitted at a data transmission rate of 64 kbytes, a data amount of 17 bytes, and one frame.
The bidirectional communication device 3 repeatedly and continuously transmits the data a transmitted from the traffic control center every 5 minutes. When the vehicle 2 enters the communication area 5, the in-vehicle communication device 4 starts transmitting the data b by receiving one frame of the data a, and repeatedly transmits the set data such as the destination and the vehicle ID. Data transmission is performed as long as the provided data a from the two-way communication device 3 is received. The light receiving unit 10 of the in-vehicle communication device 4 receives the pulse-modulated data a, converts it into an electric signal, is amplified by the amplifying unit 11, and is A / D converting unit 12.
Is digitally converted by, and is decoded by the decoder unit 13, and the decoded data is sent to the vehicle-mounted signal processing unit 15 by the data output unit 14. The in-vehicle signal processing unit 15 superimposes the received provided information on the map screen of the navigation device on the monitor and displays it in an easy-to-understand manner for the driver, and also transmits the information safely to the driver by voice guidance, and further inputs the destination from the driver. It is received from a touch panel, a keyboard, etc., and is sent out together with a predetermined vehicle ID number or a randomly generated vehicle ID number. The data transmitted from the on-vehicle signal processing unit 15 is input from the data input unit 16, encoded by the encoding unit 17, the driving unit 18 is driven by the encoded signal, and the wavelength 850 nm pulse-modulated by the light emitting unit 19 is driven.
The infrared LED of is emitted. The two-way communication device 3 installed on the road receives and decodes the modulated light from the vehicle-mounted communication device 4, and transmits the destination information and the vehicle ID information to the traffic control center through a dedicated line. At the traffic control center,
The same vehicle I is used between two points by using the time when the vehicle ID is received.
When D is received, the required time is measured from the time difference, and the latest required time for the section is transmitted to the bidirectional communication device 3 as the provision information. In addition, the future traffic demand is grasped by the destination information, and the traffic signal is effectively controlled.

The vehicle-mounted communication device 4 mounted on the vehicle 2 is 1 even when passing through the communication area 5 at a maximum speed of 70 km / h.
The communication area is 3.5 m or more in the vehicle traveling direction so that 0 kbytes of provided data a can be received twice. In addition, the destination and vehicle ID data b transmitted from the vehicle-mounted communication device 4
The communication area should be 1.6 m or more in the vehicle traveling direction so that it can be received once.

[0005]

In the prior art, since the infrared light transmitted by the bidirectional communication device 3 and the infrared light transmitted by the in-vehicle communication device 4 are asynchronous full duplex communication with the same wavelength, the in-vehicle communication device 4 When the light receiving unit 10 and the light emitting unit 19 are integrated for downsizing, when the light receiving unit 10 and the light emitting unit 19 are close to each other, the output light of the light emitting unit 10 is reflected by the front glass of the vehicle and received by the light receiving unit 19. However, there is a problem that it is difficult to receive the provided information without receiving errors due to interference with the provided information.

The present invention has been made in order to solve the above-mentioned problems, and in particular, the front glass of a vehicle is used.
An object of the present invention is to realize an in-vehicle communication device and a road-to-vehicle optical communication device that can suppress interference even when there is interference due to reflection .

[0007]

[0008]

[0009]

SUMMARY OF THE INVENTION According to the present invention, a vehicle-mounted communication unit receives a light signal including information such as traffic information transmitted from a two-way communication unit, and a vehicle side such as a vehicle ID and a destination. And a transmitting means for transmitting an optical signal containing information, wherein the transmitting means randomizes the transmission cycle of the transmitted optical signal.

In the present invention, the in-vehicle communication means is a two-way communication hand.
Light including traffic information, vehicle ID, and other information transmitted from the dan
Receiving means for receiving signals, vehicle ID, vehicle such as destination
And a transmitting means for transmitting an optical signal containing side information.
The ID signal transmitted from the two-way communication means is
If it is the ID of the
Means are provided.

The present invention also provides the bidirectional communication means.
Receives the vehicle ID from the vehicle-mounted communication means,
It has a transmitting / receiving means for transmitting both ID signals and lane numbers.

[0012]

[0013]

[0014]

In the present invention, the in-vehicle communication means transmits the information such as the vehicle ID and the destination at random timing not synchronized with the transmission interval of the provided information from the two-way communication means, so that the transmitted wave is transmitted to the front glass of the vehicle. Even when reflected, the provided information can be received at least once out of two times.

In the present invention, the vehicle-mounted communication means is the above-mentioned twin.
The ID signal transmitted from the directional communication means is the ID of the vehicle.
If there is, the transmission of the transmitting means is stopped.

In the present invention, the bidirectional communication means
Receives the vehicle ID from the vehicle-mounted communication means,
Both ID signals and the received lane number are transmitted .

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

Example 1 FIG. 1 shows a block diagram of a first embodiment of the present invention.
3, 7, 8, 10 to 19 are the same as the conventional device . Servant
Against the apparatus of years, 24 vehicle ID received from the onboard signal processing unit 15 encodes the data of the destination, such as an encoder unit 17, data a provided information transmitted repeatedly from the two-way communication device 3 of the road Is a timing generation unit that intermittently generates a signal at a timing that is different from the repetition cycle of.

[0025] Next, the operation will be described with reference to FIG.
In FIG. 2 , a is a two-way communication device 3 installed on the road.
Provided information transmitted from the vehicle-mounted communication device 4, transmission information such as a vehicle ID transmitted from the vehicle-mounted communication device 4, destination information transmission repetition cycle, p is a vehicle information transmission destination information transmission destination repetition cycle , Q1 to q80 respectively indicate the first frame to the 80th frame of the provided information.

When the bidirectional communication device 3 on the road transmits 40 to 80 frames of the information of 5 kbytes or more and 10 kbytes or less at 128 bytes per frame, the transmission repetition cycle q is 1 Mbps from the modulation speed. It is about 40 ms to 80 ms. The number of frames of provided data varies depending on the location and the provided content also changes depending on the time. Now, repeat cycle q is 8
It is set to 0 ms. When the first frame of data provided a two-way communication device 3 installed on a road-vehicle communication device 4 receives the transmitting vehicle ID and destination information of the first time 2
In the case of, the second, third and fourth frames of the provided information cannot be received due to interference. 40 ms to 80 ms after the first transmission
From the in-vehicle communication device by the second transmission of the vehicle ID and the destination information by randomly transmitting the transmission repetition period from the second time at an interval of 40 ms to 80 ms at a random time interval p between 2nd, 3rd and 4th frames of the same 2 are transmitted by the reflection from the front glass during transmission.
The probability that continuous reception is not possible is reduced, and even a vehicle traveling at 70 km / h can receive the provided information at least once, and the provided information can be received without increasing the reception error rate even if the vehicle-mounted communication device is downsized.

Example 2 FIG. 3 shows a block diagram of a second embodiment of the present invention.
3, 7, 8, 10 to 19 are the same as in the first embodiment.
A vehicle 25 receives the vehicle ID number and lane number added to the final frame of the provided information from the two-way communication device 3 installed on the road, compares the vehicle ID number with the vehicle ID of the own vehicle, and determines whether or not they are the same. The ID frame detection unit 26 is a light emission stopping unit that stops the light emission of the light emitting unit 19 when the vehicle ID of the own vehicle is detected.

[0028] Next, the operation will be described with reference to FIG.
In FIG. 4 , a is a two-way communication device 3 installed on the road.
Provided information transmitted from the vehicle-mounted communication device 4, transmission information such as a vehicle ID transmitted from the vehicle-mounted communication device 4, a destination, and the like, q1 to q80 indicate first to 80th frames of the provided information, respectively.

When the vehicle-mounted communication device 4 receives one frame of the provided information a from the two-way communication device 3 installed on the road, it starts transmitting the information b such as the vehicle ID and the destination. In this case 4
However, the second, third, and fourth frames of the provided information a cannot be received due to interference. After the transmission, the receiver waits a maximum of 80 ms for a time r for receiving the final frame based on the received frame number and the total number of frames. During this time, when the two-way communication device 3 can normally receive the vehicle ID, the two-way communication device 3 sets the vehicle ID number and the lane number as a set and transmits it as the final frame s80 of the provided information. The vehicle-mounted communication device 4 detects in the vehicle ID frame detection unit 25 whether the vehicle ID and the lane number are added to the last frame of the provided information received during the transmission suspension, and if the vehicle ID is added, the second transmission is performed. The light emission stop unit 2
Stop by 6. 2 if no vehicle ID is assigned
The in-vehicle communication device 4 is miniaturized by repeating the above sequence until the vehicle ID is given or the provided information cannot be received after the first transmission is started, and the transmitted wave is reflected by the front glass and interferes with the received wave. Even in this case, the transmission wave can be stopped with the minimum interference, and after the transmission wave is stopped, reception can be performed without increasing the reception error rate. Further, the in-vehicle signal processing unit can provide detailed information such as the fact that the own vehicle is on the left or right turn lane by combining with the navigation map by knowing the lane number of the own vehicle.

Example 3 FIG. 5 shows a block diagram of the third embodiment of the present invention.
3, 7, 8, 10 to 19 are the same as in the first embodiment.
A vehicle 27 receives the vehicle ID number and the lane number added to the final frame of the provided information from the two-way communication device 3 installed on the road, compares them with the vehicle ID of the own vehicle, and judges whether they are the same or not. The ID detection unit 26 is a light emission stopping unit that stops the light emission of the light emitting unit 19 when the vehicle ID of the own vehicle is detected.

The operation will be described with reference to FIG.
In FIG. 6 , a is a two-way communication device 3 installed on the road.
From the in-vehicle communication device, b is transmission information such as the destination of the vehicle, q1 to q80 are the 1st to 80th frames of the provided information, respectively.

When the vehicle-mounted communication device 4 receives one frame of the provided information a from the two-way communication device 3 installed on the road, the vehicle-mounted communication device 4 starts transmitting the information b such as the vehicle ID and the destination. In this case 6
However, the second, third, and fourth frames of the provided information a cannot be received due to interference. After the transmission, two frames of the additional information and the bidirectional communication device 3 pause the processing time sms for giving the vehicle ID number and the lane number for each frame. In the meantime, when the two-way communication device 3 can normally receive the vehicle ID, the two-way communication device 3 sets the vehicle ID number and the lane number as a set and adds the information to the frame header t of each frame of the provided information and transmits it. The vehicle-mounted communication device 4 detects in the vehicle ID detection unit 27 whether the vehicle ID and the lane number are added to the frame header of the provided information received during the transmission suspension, and if the vehicle ID is added, the second transmission is performed. The light emission stopping unit 26 stops the light emission. If the vehicle ID has not been assigned, the second transmission is started, and the above-described sequence is repeated until the vehicle ID is assigned or the provided information cannot be received. Even when reflected on the glass and interfered with the received wave, the transmitted wave can be stopped with the minimum interference, and after the transmitted wave is stopped, reception can be performed without increasing the reception error rate. Further, the in-vehicle signal processing unit can provide detailed information such as the fact that the own vehicle is on the left or right turn lane by combining with the navigation map by knowing the lane number of the own vehicle.

[0033]

Since the present invention is constructed as described above, it has the following effects.

[0034]

[0035]

The present invention sets the transmission cycle of the vehicle-mounted communication means to
The interference caused by the reflection from the vehicle
Even if it fails, the information provided from the two-way communication means will be received normally.
I can believe.

Further , according to the present invention, the vehicle-mounted communication means is
The ID signal transmitted from the two-way communication means is
If it is an ID, the transmission of the above transmission means is stopped.
If there is interference due to the reflection of the transmitted wave from the vehicle
Can also reduce interference.

According to the present invention, the bidirectional communication means described above.
Receives the vehicle ID from the vehicle-mounted communication means,
Send both ID signals and the received lane number to the in-vehicle communication means
Because I was able to trust it
It is possible to provide high value-added information such as folding lane information.
It

[Brief description of drawings]

FIG. 1 is a block diagram of a road-to-vehicle optical communication device showing a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the first embodiment of the present invention.

FIG. 3 is a block diagram of a road-vehicle optical communication device showing a second embodiment of the present invention.

FIG. 4 is a diagram for explaining the operation of the second embodiment of the present invention.

FIG. 5 is a block diagram of a road-vehicle optical communication device showing a third embodiment of the present invention.

FIG. 6 is a diagram for explaining the operation of the third embodiment of the present invention.

FIG. 7 is a conceptual diagram of a road-to-vehicle optical communication device.

FIG. 8 is an installation diagram of a road-to-vehicle optical communication device.

FIG. 9 is a block diagram of a conventional road-to-vehicle optical communication device.

FIG. 10 is a diagram for explaining the operation of the conventional road-to-vehicle optical communication device.

[Explanation of symbols]

1 road, 2 vehicle, 3 two-way communication device, 4 vehicle-mounted communication device, 5 communication area, 6 communication area, 7 infrared ray, 8
Infrared ray, 9 front glass, 10 light receiving section, 11 amplifying section, 12 A / D converting section, 13 decoder section, 14
Data output unit, 15 vehicle-mounted signal processing unit, 16 data input unit, 17 encoder unit, 18 driving unit, 19 light emitting unit, 24 timing generating unit, 25 vehicle ID frame detecting unit, 26 light emission stopping unit, 27 vehicle ID detecting unit, n
In-vehicle communication device Front glass reflection reception wave characteristics, o Providing information repetition period, p In-vehicle device information rest time, q1 to q
80 provided information frame, r in-vehicle device information repetition period, s in-vehicle device information pause time, t frame header.

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-6-112902 (JP, A) JP-A-6-96387 (JP, A) JP-A-63-80646 (JP, A) JP-A-58- 90835 (JP, A) JP-A-6-252854 (JP, A) JP-A-5-312949 (JP, A) JP-A-62-274836 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G08G 1/09 H04B 10/10 H04B 10/105 H04B 10/22

Claims (5)

(57) [Claims] 1. An in-vehicle communication device for receiving information such as traffic information via a two-way communication means and transmitting vehicle side information such as a vehicle ID and a destination to the two-way communication means. From the optical signal including information such as traffic information transmitted from, and transmitting means for transmitting the optical signal including the vehicle side information, further the transmitting means, the optical signal to be transmitted An in-vehicle communication device having a random transmission cycle. 2. An in-vehicle communication device for receiving information such as traffic information via a bidirectional communication means and transmitting vehicle side information such as a vehicle ID and a destination to the bidirectional communication means. From the two-way communication means. The receiving means receives an optical signal containing information such as traffic information and a vehicle ID transmitted from the transmitting means, and the transmitting means transmits an optical signal containing the vehicle side information. ID signal is the ID of your vehicle
In this case, the vehicle-mounted communication device is provided with a stopping unit that stops the transmission of the transmitting unit. 3. A vehicle I, which is provided on a road, receives information such as traffic information transmitted from a traffic control center, transmits the information to a vehicle by light, and transmits from the vehicle.
D, a bidirectional communication means for receiving an optical signal including vehicle side information such as a destination and transmitting the vehicle side information to the traffic control center, and information such as traffic information transmitted from the bidirectional communication means. An on-vehicle communication means having a receiving means for receiving an optical signal containing the vehicle-side information, and a transmitting means for transmitting the optical signal containing the vehicle-side information to the bidirectional communication means at random transmission cycles. Inter-vehicle optical communication device. 4. A vehicle I, which is provided on a road, receives information such as traffic information transmitted from a traffic control center, transmits the information to a vehicle by light, and transmits from the vehicle.
D, a bidirectional communication means for receiving an optical signal including vehicle side information such as a destination and transmitting the vehicle side information to the traffic control center, and information such as traffic information transmitted from the bidirectional communication means. Receiving means for receiving the optical signal including the transmitting means, transmitting means for transmitting the optical signal including the vehicle-side information to the bidirectional communicating means, and transmitting when the ID signal transmitted from the bidirectional communicating means is the ID of the own vehicle A vehicle-to-vehicle optical communication device comprising: a vehicle-mounted communication unit having stop means for stopping transmission of the means. 5. The bidirectional communication means includes a transmission / reception means for receiving a vehicle ID from the vehicle-mounted communication means and transmitting the vehicle ID signal and the lane number. The road-to-vehicle optical communication device described in Crab.