JP2012008753A - Intersection travel safety system - Google Patents

Abstract

【Task】
Vehicle signs and road sensors are provided on traffic signs and road surface indicators, and warnings are displayed on signs, indicators, etc. that are easy for the driver to see.
[Solution]
In the intersection safe traveling system 100, when the control device detects the vehicles V <b> 1 and V <b> 2 that are about to enter the intersection by the vehicle sensor 112 provided on a certain traffic sign, the control device intersects with the road on which the vehicle is traveling. A display for calling attention to the vehicle is performed on the indicator lights 1A, 1B, 1C, and 1D provided on the traffic signs 8A, 8B, 8C, and 8D installed on the road.
[Selection] Figure 1

Description

  The present invention relates to an intersection safe driving system capable of preventing collision accidents between vehicles at an intersection and an accident between a vehicle and a person. Specifically, a traffic sign or a road surface indicator is provided with a vehicle sensor or a human sensor, and a driver gives a warning. An intersection safe traveling system that can be displayed on the sign, the indicator lamp, etc. that are easily visible.

  Conventionally, road reflecting mirrors (curve mirrors) may be provided on roads where temporary stops at intersections with poor visibility or roads that are not priority roads with poor visibility are secured. Yes (see JP 2007-122010 etc.).

JP2001-084486

However, the reflection image of the road reflector has a “blind spot” that cannot be seen sufficiently, and the reflection image is bilaterally symmetric, so it may not be possible to prevent accidents that can be prevented due to driver error.
An object of the present invention is to provide a vehicle sensor or a human sensor on a traffic sign or a road surface indicator, and to display a warning on a sign, an indicator light or the like that is easy for a driver to visually recognize, thereby causing a collision accident between vehicles at an intersection and a vehicle It is to provide an intersection safe driving system that can prevent accidents with people.

The intersection safe traveling system of the present invention is summarized as (1) to (7).
(1)
There is an intersection safe driving system in which traffic signs equipped with vehicle sensors, indicator lights, and control devices are installed at each entrance of the intersection,
When the vehicle sensor provided near the intersection (for example, a traffic sign) detects a vehicle that is about to enter the intersection, the control device detects the vehicle that intersects the road on which the vehicle is traveling. A display for alerting the vehicle is displayed on the indicator light provided on the installed traffic sign.
An intersection safe driving system characterized by that.
The intersection safe driving system of the present invention is typically applied to an intersection having no traffic light and poor visibility.
In the present invention, the “vehicle” refers to a vehicle that is mainly restricted by signals other than pedestrians, such as an automobile (including a motorcycle), a motorbike, a light vehicle (including a bicycle), a trolley bus, and a carriage. The “pedestrian” includes a wheelchair (including an electric wheelchair).
The vehicle sensor can be provided, for example, on the sign itself such as “pause” or “slow down” or on a structure to which the sign is attached (traffic sign structure).
The vehicle sensor may be a radar provided in the traffic sign structure. Further, the vehicle sensor can be a camera provided in the traffic sign structure, and in this case, the control device can detect the vehicle by recognizing the shape of the captured image. In addition to a radar and a camera, an ultrasonic sensor, a metal detector, and an optical distance sensor can be used.
Any indicator lamp can be used as long as it can display the direction. Specifically, the indicator lamp may be, for example, a stationary triangle or a triangle that moves while being lit.

(2)
There is an intersection safe driving system in which a road surface indicator having a vehicle sensor, an indicator light, and a control device is installed at the center of an intersection,
When the vehicle sensor detects a vehicle that is about to enter the intersection, the control device attempts to enter the intersection among vehicles traveling on a road that intersects the road on which the vehicle is traveling. A display for calling attention to other vehicles is displayed on the indicator light.
An intersection safe driving system characterized by that.
As a vehicle sensor, a radar provided on a road surface indicator can be used. Moreover, it can use with the camera with which the road surface indicator was equipped as a vehicle sensor, In this case, a control apparatus can detect a vehicle by performing shape recognition of a picked-up image.

(3)
An intersection safe traveling system in which a vehicle detection facility including a vehicle sensor, a transmission circuit, and a control device is installed at an intersection, and the transmission circuit transmits information to a vehicle including a reception circuit,
When the control device detects a vehicle that is about to enter the intersection by the vehicle sensor, the control device uses the transmission circuit to detect a vehicle that is traveling on a road that intersects the road on which the vehicle is traveling. , Transmitting information relating to the detection to a vehicle including the receiving circuit that is about to enter an intersection,
An intersection safe driving system characterized by that.
That is, the vehicle sensor detects whether “a certain vehicle” is about to enter the intersection. The control device detects information (for example, “a certain vehicle”) from “another vehicle” trying to enter the intersection among the vehicles traveling on the road intersecting with the road on which “the certain vehicle” is traveling. Information on which road is going to enter the intersection).

(4)
There is an intersection safe driving system in which traffic signs equipped with human sensors, indicator lights and control devices are installed at each entrance of the intersection,
When the control device detects a person or a bicycle near the intersection by the human sensor provided near the intersection (for example, a certain traffic sign), the control device displays the person on the indicator lamp provided at each traffic sign. Or display to call attention to the bicycle,
An intersection safe driving system characterized by that.
An infrared camera attached to the traffic sign structure can be used as a human sensor. In this case, the control device detects a person (including a bicycle driver and a wheelchair user) by performing temperature recognition. be able to. In addition, a camera attached to a traffic sign structure can be used as a human sensor. In this case, the control device can detect a person, a wheelchair, a bicycle, and the like by recognizing the shape of the captured image.

(5)
There is an intersection safe driving system in which a road surface indicator equipped with a human sensor, an indicator light and a control device is installed at the center of the intersection,
When the control device detects a person near an intersection by the human sensor provided in a certain road surface indicator, the control device alerts the person or the bicycle to the indicator light provided in each road surface indicator. To display
An intersection safe driving system characterized by that.
An infrared camera attached to the road surface display can be used as a human sensor. In this case, the control device can detect a person or a bicycle by performing temperature recognition. In addition, a normal camera attached to a road surface display can be used as a human sensor, and in this case, the control device can detect a person or a bicycle by recognizing the shape of a captured image. In addition to an infrared camera and a normal camera, an ultrasonic sensor and an optical sensor can be used as the human sensor.

(6)
There is an intersection safe traveling system in which a human detection facility including a human sensor, a transmission circuit, and a control device is installed at an intersection, and the transmission circuit transmits information to a vehicle including a reception circuit.
When the control device detects a person passing near the intersection by the human sensor, the control circuit detects an intersection among vehicles traveling on a road that intersects the road on which the person passes. Transmitting information relating to the detection to the vehicle about to enter the vehicle;
An intersection safe driving system characterized by that.
In this aspect, the intersection safe driving system transmits information to the vehicle including the receiving circuit.
For example, an infrared sensor provided on a traffic sign or a road surface indicator can be used as a human sensor. In this case, when the infrared sensor detects the presence of a pedestrian or the like, the control device detects the presence of the pedestrian from the communication circuit. Sends information that evokes.
In addition, a mobile phone equipped with a GPS terminal function can be adopted as the human sensor. In this case, the communication circuit receives position information and the like transmitted from the mobile phone, and the control device takes an intersection from the communication circuit. The position information and the like are transmitted to the vehicle about to enter.

(7)
There is an intersection safe driving system in which a fixed station radio device obtained in a traffic sign and a mobile station radio device provided in a vehicle communicate with each other,
The fixed station wireless device is:
A demodulation circuit that lowers the radio frequency band signal received by the antenna to an arbitrary frequency and outputs it to another circuit;
A modulation circuit that raises a signal of an arbitrary frequency input from the other circuit to a radio frequency and outputs the signal to the antenna;
A switch circuit for switching the antenna to either the demodulation circuit or the modulation circuit;
Equipped with a built-in RF integrated circuit for development,
The RF integrated circuit is integrated independently of the other circuits, and
The demodulator circuit converts the received radio frequency signal into a low frequency signal,
The intersection safety traveling system, wherein the modulation circuit converts a low frequency signal into a radio frequency signal.

  In the present invention, the vehicle sensor may be any sensor as long as it can effectively detect a vehicle approaching the intersection. For example, a photoelectric switch or a pressure sensor (for example, a cable sensor that turns ON when stepped on with a tire) can be used as a vehicle sensor. The human sensor can be any sensor as long as it can detect a person or the like near the intersection. For example, a photoelectric switch or a pressure-sensitive sensor (for example, a cable-shaped sensor that is turned on when stepped on) can be used as a vehicle sensor.

  Vehicle sensors and people sensors are installed on traffic signs and road surface indicators, and warnings are displayed on signs, indicators, etc., which are easy for the driver to visually recognize, preventing collisions between vehicles at intersections and accidents between vehicles and people. it can.

BRIEF DESCRIPTION OF THE DRAWINGS It is whole explanatory drawing which shows the 1st embodiment of the traffic safety system of this invention. It is a functional block diagram of the vehicle detection unit used with the traffic safety system of FIG. It is a figure which shows the traffic sign in the traffic safety system of FIG. 1, (A) is a figure which shows the traffic sign 8A, (B) is a figure which shows the traffic sign 8B, (C) is a figure which shows the traffic sign 8C, (D ) Is a diagram showing a traffic sign 8D. It is whole explanatory drawing which shows the 2nd embodiment of the traffic safety system of this invention. It is a functional block diagram of the traffic safety system of FIG. It is a figure which shows the road surface indicator in the traffic safety system of FIG. 4, (A) is the figure seen from D1 direction, (B) is the figure seen from D2 direction. It is whole explanatory drawing which shows the 3rd embodiment of the traffic safety system of this invention. It is a functional block diagram of the traffic safety system of FIG. It is a figure which shows the road surface indicator in the traffic safety system of FIG. In the traffic safety system of FIG. 7, it is a figure which shows a mode that a road surface indicator generate | occur | produces an electromagnetic wave. In the traffic safety system of FIG. 7, it is a figure which shows the vehicle detection mark displayed on the head-up display of a vehicle. It is a whole explanatory view showing the 4th embodiment of the traffic safety system of the present invention. It is a functional block diagram of the vehicle detection unit used with the traffic safety system of FIG. It is a figure which shows the road surface indicator in the traffic safety system of FIG. 12, (A) is the figure seen from D1 direction, (B) is the figure seen from D2 direction. It is whole explanatory drawing which shows the 5th embodiment of the traffic safety system of this invention. It is a functional block diagram of the traffic safety system of FIG. It is a figure which shows the road surface indicator in the traffic safety system of FIG. 15, (A) is the figure seen from D1 direction, (B) is the figure seen from D2 direction. It is whole explanatory drawing which shows the 6th embodiment of the traffic safety system of this invention. It is a functional block diagram of the traffic safety system of FIG. It is a figure which shows the road surface indicator in the traffic safety system of FIG. It is a figure which shows a mode that a road surface indicator generate | occur | produces an electromagnetic wave in the traffic safety system of FIG. It is a figure which shows the person detection mark displayed on the head-up display of a vehicle in the traffic safety system of FIG. It is whole explanatory drawing which shows the deformation | transformation embodiment of the traffic safety system of FIG. It is a functional block diagram of the traffic safety system of FIG. It is a figure which shows RF integrated circuit of the fixed station radio | wireless apparatus and mobile station radio | wireless apparatus in this invention, and is a block diagram which shows a mode that RF integrated circuit was connected with the physical layer circuit and the MAC circuit. FIG. 26 is a block diagram showing a demodulation circuit and a modulation circuit of the RF integrated circuit of FIG. 25 in detail.

  Hereinafter, first to sixth embodiments of the present invention will be described. In each embodiment, the traffic safety system is applied to a four-way intersection where there is no traffic light suppression. One of these four roads has a one-way exit at the intersection. In each embodiment, four directions of the road heading for the intersection are indicated by D1, D2, D3, and D4. The vehicle V1 travels in the D1 direction toward the intersection, and the vehicle V2 travels in the D2 direction.

  FIG. 1 is an overall explanatory view showing a first embodiment of the traffic safety system of the present invention. In the present embodiment, the traffic safety system 100 includes four vehicle detection units 1A and 1B set on traffic signs (signs “pause” in the figure) 8A, 8B, 8C and 8D installed at the entrance of the intersection, respectively. , 1C, 1D.

  As shown in FIG. 2, the vehicle detection units 1A, 1B, 1C, and 1D include a vehicle recognition control unit (control device) 111, a vehicle sensor 112, a transmission unit 113, a display control unit 121, and an indicator lamp 122, respectively. And a receiving unit 123. The vehicle recognition control unit 111 can detect the vehicle that is about to enter the intersection by the vehicle sensor 112 provided in each of the traffic signs 8A, 8B, 8C, and 8D. The vehicle sensor 112 can be a camera, for example, and the vehicle recognition control unit 111 can detect the presence of the vehicle by a change in the captured image. Further, the vehicle sensor 112 can be a radar, for example, and the vehicle recognition control unit 111 can detect the presence of the vehicle by the magnitude or change of the response.

  In the present embodiment, the vehicle sensors 112 of the vehicle detection units 1A and 1B detect the vehicles V1 and V2 that are about to enter the intersection. And the display control part 121 performs the alert display with respect to the vehicles V1 and V2 on the indicator lamp 122 each provided in the traffic sign installed in the road which cross | intersects the road where the vehicles V1 and V2 are drive | working.

  FIGS. 3B and 3D show the display of the indicator lamps 122 respectively provided on the traffic signs 8B and 8D installed on the road intersecting with the road on which the vehicle V1 is traveling. FIGS. 3A and 3C show the display of the indicator lamps 122 respectively provided on the traffic signs 8A and 8C installed on the road intersecting the road on which the vehicle V2 is traveling. In the present embodiment, as shown in FIGS. 3A to 3D, since the presence of a blind spot is displayed on a traffic sign, a collision accident between vehicles at an intersection can be prevented in advance. .

  FIG. 4 is an overall explanatory view showing a second embodiment of the traffic safety system of the present invention. As shown in FIG. 5, the traffic safety system 200 according to the present embodiment includes a road surface indicator 2 installed at the center of an intersection. The road surface indicator 2 includes a vehicle recognition control unit (control device) 211, vehicle sensors 212A, 212B, 212C, and 212D, a display control unit (control device) 221, and indicator lights 222A, 222B, 222C, and 222D. .

  The vehicle recognition control unit 211 can detect a vehicle that is about to enter an intersection using vehicle sensors 212A, 212B, 212C, and 212D. The vehicle sensors 212A, 212B, 212C, and 212D can be cameras, for example, and the vehicle recognition control unit 211 can detect the presence of the vehicle by a change in the captured image. Further, the vehicle sensors 212A, 212B, 212C, and 212D can be radars, for example, and the vehicle recognition control unit 211 can detect the presence of the vehicle based on the magnitude or change of the response.

  In the present embodiment, the vehicle sensors 212A and 212B detect the vehicles V1 and V2 that are about to enter the intersection. Then, the display control unit 221 displays a warning on an indicator lamp that can be seen from other vehicles traveling on a road that intersects the road on which the vehicles V1 and V2 are traveling.

  FIG. 6A shows the lighting state of the road surface indicator 2 viewed from the direction D1, and FIG. 6B shows the lighting state of the road surface indicator 2 viewed from the direction D2. Also in this embodiment, as shown in FIGS. 6 (A) and 6 (B), since the existence of a blind spot is displayed on the road surface indicator, it is possible to prevent a collision accident between vehicles at an intersection. it can.

  FIG. 7 is an overall explanatory view showing a third embodiment of the traffic safety system of the present invention. As shown in FIGS. 7 and 8, the traffic safety system 300 according to the present embodiment includes a road surface indicator 31 (shown in FIG. 9) and a vehicle (shown as V1 and V2 in FIG. 7) installed at the center of an intersection. , In-vehicle unit 32 mounted on V) in FIG. The road surface indicator 31 includes a vehicle recognition control unit (control device) 311, vehicle sensors 312A, 312B, 312C, 312D, and a transmission unit 313 (including the antenna 33). The in-vehicle unit 32 includes a display control unit (control device) 321, a head-up display 322, and a reception unit 323.

  The vehicle recognition control unit 311 can detect a vehicle that is about to enter an intersection using vehicle sensors 312A, 312B, 312C, and 312D. The vehicle sensors 312A, 312B, 312C, and 312D can be, for example, cameras, and the vehicle recognition control unit 311 can detect the presence of the vehicle by a change in the captured image. Further, the vehicle sensors 312A, 312B, 312C, 312D can be radars, for example, and the vehicle recognition control unit 311 can detect the presence of the vehicle based on the magnitude or change of the response.

  In the present embodiment, the vehicle sensors 312A and 312B detect the vehicles V1 and V2 that are about to enter the intersection. The vehicle recognition control unit 311 transmits predetermined information (direction information DR and vehicle detection information VD) from the transmission unit 313 to the reception unit 323 of the vehicle (in addition to FIG. 8, the road surface display of FIG. 10 generates radio waves). In the vehicles V1 and V2, the display control unit 321 performs a warning display on the head-up display (HUD).

  FIG. 11A shows the display state of the head-up display (HUD) of the vehicle V1, and FIG. 11B shows the display state of the head-up display (HUD) of the vehicle V2. Also in this embodiment, as shown in FIGS. 11 (A) and 11 (B), since the presence of a blind spot is displayed on the head-up display of each vehicle, a collision accident between vehicles at an intersection is obviated. Can be prevented.

  FIG. 12 is an overall explanatory view showing a fourth embodiment of the traffic safety system of the present invention. In the present embodiment, the traffic safety system 400 includes four human detection units 4A and 4B set in traffic signs ("pause" signs in the figure) 8A, 8B, 8C and 8D installed at the entrance of the intersection, respectively. , 4C, 4D.

  As shown in FIG. 13, the human detection units 4A, 4B, 4C, and 4D include a human recognition control unit (control device) 411, a human sensor 412, a transmission unit 413, a display control unit 421, and an indicator light 422, respectively. And a receiving unit 423. The human recognition control unit 411 can detect a pedestrian (or a bicycle driver) in the vicinity of the intersection by using human sensors 412 provided in the traffic signs 8A, 8B, 8C, and 8D, respectively. The human sensor 412 can be an infrared camera, for example, and the human recognition control unit 411 can detect the presence of a person based on the brightness of a captured image. In addition, the human sensor 412 can be a color camera, for example, and the human recognition control unit 411 can detect the presence of a person based on a change in the size or movement of an image.

  In the present embodiment, the presence / absence of a pedestrian in the vicinity of the intersection and the position are detected based on the detection information of the human sensors 412 of the human detection units 4A, 4B, 4C, and 4D. And the display control part 421 performs the alert display with respect to the pedestrian H on the indicator lamp 122 of the traffic signs 8A, 8B, 8C, 8D. In addition, since the position detection technique of a pedestrian is well-known, description is abbreviate | omitted. Moreover, since the detection technique of the presence or absence of a pedestrian and the pedestrian position detection technique when there are a plurality of pedestrians are well known, the description thereof is omitted.

  14 (A), (B), (C), and (D), the traffic signs 8A, 8B, 8C, and 8D provided when the pedestrian H exists at the position shown in FIG. 12, respectively. The display of the indicator lamp 422 is shown. In this embodiment, as shown in FIGS. 14 (A) to (D), since the presence of a blind spot is displayed on the traffic sign, an accident between the vehicle and the pedestrian (or bicycle) at the intersection is detected. It can be prevented in advance.

  FIG. 15 is an overall explanatory view showing a fifth embodiment of the traffic safety system of the present invention. As shown in FIG. 15, the traffic safety system 500 of the present embodiment includes a road surface indicator 5 installed at the center of an intersection. As shown in FIG. 16, the road surface indicator 5 includes a human recognition control unit (control device) 511, human sensors 512A, 512B, 512C, and 512D, a display control unit (control device) 521, and indicator lights 522A and 522B. , 522C, 522D.

  The human recognition control unit 511 can detect a pedestrian (or a bicycle driver) in the vicinity of the intersection by human sensors 512A, 512B, 512C, and 512D provided in the road surface display 5. The human sensors 512A, 512B, 512C, and 512D can be, for example, infrared cameras, and the human recognition control unit 511 can detect the presence of a person based on the brightness of a captured image. The human sensors 512A, 512B, 512C, and 512D can be color cameras, for example, and the human sensors 512A, 512B, 512C, and 512D can detect the presence of a person based on changes in image size and movement.

  In the present embodiment, the human sensor 512D detects the pedestrian H near the intersection. Then, the display control unit performs a warning display on a predetermined indicator lamp. FIG. 17A shows a lighting state of the road surface indicator 5 viewed from the direction D1, and FIG. 17B shows a lighting state of the road surface indicator 5 viewed from the direction D2. Also in this embodiment, as shown in FIGS. 17A and 17B, since the presence of a pedestrian is displayed on the road surface indicator, an accident between a pedestrian (or bicycle) and a vehicle at an intersection is prevented in advance. be able to. In FIGS. 17A and 17B, three cameras are provided on one surface of the road surface indicator 5 to prevent the field of view from being narrowed by mud or the like.

  FIG. 18 is an overall explanatory view showing a sixth embodiment of the traffic safety system of the present invention. As shown in FIGS. 18 and 19, the traffic safety system 600 of the present embodiment includes a road surface indicator 61 (external appearance is shown in FIG. 20) and a vehicle (shown as V 1 and V 2 in FIG. , In-vehicle unit 62 mounted on V) in FIG. The road surface display 61 includes a human recognition control unit (control device) 611, human sensors 612A, 612B, 612C, 612D, and a transmission unit (including the antenna 63) 613. The in-vehicle unit 62 includes a display control unit (control device) 621, a head-up display 622, and a reception unit 623.

  The human recognition control unit 611 can detect a pedestrian (or a bicycle driver) near the intersection by using human sensors 612A, 612B, 612C, and 612D. The human sensors 612A, 612B, 612C, 612D can be infrared cameras, and the human recognition control unit 611 can detect the presence of a person based on the brightness of a captured image. The human sensors 612A, 612B, 612C, and 612D can be color cameras, for example, and the human sensors 612A, 612B, 612C, and 612D can detect the presence of a person based on a change in the size and movement of an image.

  In the present embodiment, the human sensor 612D detects a pedestrian near the intersection. The person recognition control unit 611 transmits predetermined information (direction information DR and person detection information HD) from the transmission unit 613 to the reception unit 623 of the vehicle V1 (the road surface display of FIG. 21 in addition to FIG. 19 generates radio waves). In the vehicle V1, the display control unit 621 displays a warning on the head-up display (HUD).

FIG. 22 shows a display state of the head-up display (HUD) of the vehicle V1. Also in this embodiment, as shown in FIG. 22, since the presence of a pedestrian at a blind spot is displayed on the head-up display of the traveling vehicle, the pedestrian (or bicycle) at the intersection and the vehicle Accidents can be prevented. In FIG. 20, three cameras are provided on one surface of the road surface indicator 61 to prevent the field of view from being narrowed by mud or the like.
FIG. 23 is an overall explanatory view showing the seventh embodiment (modified example of the sixth embodiment). As shown in FIGS. 23 and 24, the traffic safety system 700 of this embodiment includes a road surface indicator 71 and a vehicle installed at the center of an intersection (indicated as V1 and V2 in FIG. 23 and indicated by V in FIG. 24). And an in-vehicle unit 72 mounted on the vehicle. The road surface indicator 71 includes a human recognition control unit (control device) 711, a human sensor (GPS terminal position reception device) 712, and a transmission unit 713. The in-vehicle unit 72 includes a display control unit (control device) 721, a head-up display 722, and a reception unit 723.

  The human recognition control unit 711 can receive position information from a GPS terminal carried by a pedestrian (or a bicycle driver) near the intersection by the human sensor 712, and the human recognition control unit 711 receives the position information. When it is in the vicinity of the intersection, predetermined information (direction information DR and person detection information HD) is transmitted from the transmission unit 713 to the reception unit 723 of the vehicle V1. In the vehicle V1, the display control unit 721 performs a warning display on the head-up display (HUD).

  25 and 26 are explanatory diagrams showing embodiments of the RF integrated circuit of the present invention. In FIG. 25, the RF integrated circuit RFIC includes a demodulation circuit RC, a modulation circuit TR, and a switch circuit SW. The RF integrated circuit RFIC is connected to a circuit composed of a physical layer circuit PHY and a media access circuit MAC, and the circuit is connected to a computer CPU.

  The demodulation circuit RC reduces the radio frequency band signal (here, a signal of 715 M to 725 MHz) received by the antenna to an arbitrary frequency (5 MHz to 20 MHz) and outputs it to the physical layer circuit PHY. The modulation circuit TR raises a signal of an arbitrary frequency (5 MHz to 20 MHz) input from the physical layer circuit PHY to a radio frequency (a signal of 715 M to 725 MHz) and outputs it to the antenna ANT.

  The physical layer circuit PHY is typically an interface circuit. In this embodiment, the analog / digital converter A / D and the digital / analog converter D / A are provided between the physical layer circuit PHY and the RF integrated circuit RFIC, but can be provided in the physical layer circuit PHY. And can be provided in the RF integrated circuit RFIC. The physical layer circuit PHY is connected to the media access circuit MAC, and a signal from the demodulation circuit RC is passed to the media access circuit MAC, and a signal from the media access circuit MAC is passed to the modulation circuit TR. The antenna AND is connected to the demodulation circuit RC and the modulation circuit RC via the switch circuit SW. The switch circuit SW can switch the antenna ANT to either the demodulation circuit RC or the modulation circuit RC by an external switching signal SC.

  As shown in FIG. 26, the demodulation circuit RC can be composed of an intermediate frequency conversion circuit RC1 and a low frequency conversion circuit RC2. The intermediate frequency conversion circuit RC1 converts the radio frequency signal input via the switch circuit SW into an intermediate frequency, and further converts it to a frequency of about 5 to 25 MHz by the low frequency conversion circuit RC2. Then, a specific frequency signal among these frequency signals is output to the physical layer circuit PHY in FIG. Further, as shown in FIG. 26, the modulation circuit RC can be composed of an intermediate frequency conversion circuit TR1 and a high frequency conversion circuit TR2. A specific frequency signal among the frequency signals from the physical layer circuit PHY is converted into an intermediate frequency by the intermediate frequency conversion circuit TR1. Further, the intermediate frequency signal is modulated into a radio frequency (700 MHz band) signal by the high frequency conversion circuit TR2 and output to the antenna ANT via the switch circuit SW.

1A to 1D Vehicle detection units 2, 5, 31, 61, 71 Road surface indicators 4A to 4D Human detection units 8A to 8D Traffic signs 32, 62, 72 On-vehicle units 33, 63 Antennas 100, 200, 300, 400, 500, 600,700 Traffic safety systems 112, 212A to 212D, 312A Vehicle sensors 111, 211, 311 Vehicle recognition control unit 113, 313, 413, 613, 713 Transmission unit 121, 221, 321, 421, 521, 612, 721 Display control Units 122, 222A to 222D, 422, 522A to 522D Indicator lamps 123, 323, 423, 623, 723 Receivers 322, 622, 722 Head-up displays 412, 512A to 512D, 612A to 612D, 712 Human sensors 411, 511 611,711 Human recognition Control unit DR Direction information H Pedestrian HD Person detection information V1, V2 Vehicle VD Vehicle detection information

Claims (7)

There is an intersection safe driving system in which traffic signs equipped with vehicle sensors, indicator lights, and control devices are installed at each entrance of the intersection,
When the control device detects a vehicle that is about to enter the intersection by the vehicle sensor provided in the vicinity of the intersection, the traffic sign installed on the road that intersects the road on which the vehicle is traveling A display for alerting the vehicle to the indicator light provided in
An intersection safe driving system characterized by that. There is an intersection safe driving system in which a road surface indicator having a vehicle sensor, an indicator light, and a control device is installed at the center of an intersection,
When the vehicle sensor detects a vehicle that is about to enter the intersection, the control device attempts to enter the intersection among vehicles traveling on a road that intersects the road on which the vehicle is traveling. A display for calling attention to other vehicles is displayed on the indicator light.
An intersection safe driving system characterized by that. An intersection safe traveling system in which a vehicle detection facility including a vehicle sensor, a transmission circuit, and a control device is installed at an intersection, and the transmission circuit transmits information to a vehicle including a reception circuit,
When the control device detects a vehicle that is about to enter the intersection by the vehicle sensor, the control device uses the transmission circuit to detect a vehicle that is traveling on a road that intersects the road on which the vehicle is traveling. , Transmitting information relating to the detection to a vehicle including the receiving circuit that is about to enter an intersection,
An intersection safe driving system characterized by that. There is an intersection safe driving system in which traffic signs equipped with human sensors, indicator lights and control devices are installed at each entrance of the intersection,
When the control device detects a person or a bicycle near the intersection by the human sensor provided in the vicinity of the intersection, the control device alerts the person or the bicycle to the indicator light provided in each traffic sign. To display
An intersection safe driving system characterized by that. There is an intersection safe driving system in which a road surface indicator equipped with a human sensor, an indicator light and a control device is installed at the center of the intersection,
When the human sensor provided near the intersection detects a person near the intersection, the control device alerts the person or the bicycle to the indicator lamp provided on each road surface indicator. For display,
An intersection safe driving system characterized by that. There is an intersection safe traveling system in which a human detection facility including a human sensor, a transmission circuit, and a control device is installed at an intersection, and the transmission circuit transmits information to a vehicle including a reception circuit.
When the control device detects a person passing near the intersection by the human sensor, the control circuit detects an intersection among vehicles traveling on a road that intersects the road on which the person passes. Transmitting information relating to the detection to the vehicle about to enter the vehicle;
An intersection safe driving system characterized by that. An intersection safe traveling system in which a fixed station wireless device obtained in a traffic sign and a mobile station wireless device provided in a vehicle communicate with each other,
The fixed station radio device and mobile station radio device are:
A demodulation circuit that lowers the radio frequency band signal received by the antenna to an arbitrary frequency and outputs it to another circuit;
A modulation circuit that raises a signal of an arbitrary frequency input from the other circuit to a radio frequency and outputs the signal to the antenna;
A switch circuit for switching the antenna to either the demodulation circuit or the modulation circuit;
Equipped with a built-in RF integrated circuit for development,
The RF integrated circuit is integrated independently of the other circuits, and
The demodulator circuit converts the received radio frequency signal into a low frequency signal,
The intersection safety traveling system, wherein the modulation circuit converts a low frequency signal into a radio frequency signal.