JP2000227995A - Traffic flow control system - Google Patents

Abstract

(57) [Summary] [Problem] To accurately convey the traffic congestion situation mainly on the main road to the driver, and further, perform appropriate guidance to the detour,
To provide a traffic flow control device that controls a traffic flow to be smooth. SOLUTION: The radio wave transmitting means 1 which is installed in each car and transmits a specific radio wave, and the radio wave transmitting means 1 which is installed at a fixed interval on a side wall of a road or the like, detects a radio wave from the radio wave transmitting means 1, and A sensor means 2 for detecting the number and transmitting the number as a radio wave; a data receiving means 4 for receiving data from the sensor means 2; a storage means 5 for temporarily storing the received data; A CPU 6 that calculates a traffic congestion rate based on the information and determines a direction in which a detour can be made;
Data transmission means 7 for transmitting the traffic congestion rate calculated by PU 6 and signal control data to the detour to the outside, display means 9 for displaying the traffic congestion status from data transmission means 7, and signal control transmitted from data transmission means 7 Signal control means 10 for actually controlling the signal based on the data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traffic flow control system which mainly informs a driver in advance of information for reducing traffic congestion on a main road.

[0002]

2. Description of the Related Art Conventionally, on a main road, a number of display devices are installed as a service for a driver, such as a display of a traffic congestion condition or an accident. There is only a display, there is no proper guidance to the detour, and no control of the traffic light linked to the detour is performed.

[0003]

Under the conventional traffic flow control system, automobiles successively enter congested roads, and congestion becomes worse, especially on consecutive holidays and weekends. Road traffic has become chronic. As a result, the driver's stress has increased, and this has caused many accidents, and the economic loss due to wasted time and fuel has also increased. The realization of a flow control system is desired.

Accordingly, an object of the present invention is to provide a traffic flow control system which can accurately inform a driver of a traffic congestion situation mainly on a main road, etc., and furthermore, can appropriately guide a detour to ensure a smooth traffic flow. Is to provide.

[0005]

A traffic flow control system according to the present invention is provided at each mobile unit, and a radio wave transmitting means for transmitting a unique radio wave is provided at regular intervals along a moving path along which the mobile unit moves. Installed, a sensor means for detecting a radio wave transmitted from the radio wave transmitting means and detecting the number of the moving objects,
A calculating means for calculating the traffic congestion rate based on the number data of the moving bodies from the sensor means and for judging and selecting a detour, and a display for displaying the traffic congestion rate calculated by the calculating means and the selected detour data Means.

In the above-mentioned traffic flow control system according to the present invention, the plurality of sensors are arranged at intervals such that radio waves from one moving object are detected only by a maximum of two adjacent sensors. Two adjacent sensors are provided along the movement path.

Further, in the traffic flow control system according to the present invention, the plurality of sensors are characterized in that a priority order is determined between two adjacent sensors.

Further, in the traffic flow control system according to the present invention, when the two adjacent sensors detect the same moving object, the priority is assigned to the moving object detected by the lower priority sensor. Set the count data to 0
It is characterized by the following.

Further, the traffic flow control system according to the present invention comprises:
Installed in each car, and a radio wave transmitting means for transmitting a unique radio wave, installed at regular intervals along the road, and detects the radio wave transmitted from the radio wave transmitting means, and detects the number of the vehicle, Sensor means for transmitting the number data as radio waves, receiving means for receiving radio waves from these sensor means, storage means for temporarily storing the number data from radio signals received by the receiving means, Calculating means for calculating the traffic congestion rate based on the data accumulated in the means, and determining and selecting a possible detour; transmitting means for transmitting the congestion rate calculated by the calculating means and signal control to the detour; Display means for displaying the traffic congestion status transmitted from the transmission means, and traffic signal control means controlled based on a signal control signal transmitted from the data transmission means. The one in which the features.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

First, an embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a block diagram showing the overall configuration of a traffic flow control system according to one embodiment of the present invention. In FIG. 1, a radio wave transmitting unit 1 is provided in each running vehicle, and, like a license plate, has a frequency unique to each vehicle and transmits a radio wave of a certain level. Sensors 2 are installed at regular intervals on the side wall of the road, and are arranged so as to catch radio waves transmitted from the radio wave transmitter 1 of the automobile. In this case, the sensor 2 is composed of a maximum of two adjacent sensors 2 to which radio waves transmitted from one vehicle are adjacent.
It is installed at intervals that can only be detected by Radio waves captured by these sensors 2 are sent to the central monitoring and control device 3.

The central monitoring and control device 3 has a data receiving unit 4 for directly capturing radio waves. The data receiving unit 4 further includes a storage unit 5 for temporarily storing the data captured by the data receiving unit 4. And a CPU 6 which is a calculating means for calculating a traffic congestion rate and a traffic congestion section based on the data accumulated in the storage unit 5, determining a detourable road, and controlling a signal to the detour. And a data transmission unit 7 for outputting the data to the outside of the central monitoring and control device 3.
They are connected via signal lines 8.

The central monitoring and control device 3 has a display 9
And the signal control unit 10 are connected, and among these,
The display unit 9 displays data calculated by the CPU 6, that is, data for notifying traffic congestion conditions and a detour, and one signal control unit 10 is configured to send a signal indicating a detour direction.

Next, the operation of the traffic flow control system having the above configuration will be described.

Now, when a sensor 2 installed at a fixed interval on a road captures a radio wave from a car, the captured radio wave is sent to a data receiving unit 4 in the central monitoring and control device 3 and temporarily sent as a data signal. It is stored in the storage unit 5.
The data stored in the storage unit 5 comprises the ID number of the sensor 2 and the number of vehicles, and based on this data, the CPU 6
Then, a traffic congestion rate, a traffic congestion section, a detour, etc. are calculated to further reduce traffic congestion. Then, the calculated data is sent to the display unit 9, the driver is informed of the congestion status via the display unit 9, and further sent to the signal control unit 10 to perform signal control on the detour.

Here, a method of calculating the congestion rate according to the present invention will be described with reference to FIG. FIG. 2 is an explanatory diagram illustrating a method of detecting a traffic congestion rate in the traffic flow control system according to the present invention. 2, the same components as those in FIG. 1 are denoted by the same reference numerals, detailed description thereof will be omitted, and only the portions different from FIG. 1 will be mainly described below. In the figure, two vehicles 12A and 12B are now traveling on a road 11 in the direction indicated by an arrow 13, and a radio wave transmitting unit 1 is attached to the front of the vehicles 12A and 12B.

On the left side wall 14 of the road 11, three sensors 15A, 15B and 15C are installed at regular intervals L. It is placed in the opposite direction. In the figure, the position of the leading car 12B is represented by a linear distance L1 from the radio wave transmitting unit 1 to the sensor 15B and a linear distance L3 from the lower sensor 15A to the sensor 15B.
On the other hand, the position of the succeeding automobile 12A is the same as the distance L2 from the radio wave transmitting unit 1 to the upper sensor 15C and the distance from the middle sensor 15B.
The moment when the vehicle is traveling at the position is shown.

Thus, the vehicles 12A, 12B and 3
In the positional relationship with the sensors 15A to 15C, the radio waves transmitted from each of the automobiles 12A and 12B are output at a constant frequency, so that the following equation is established: L1 ≦ Range of radio wave ≦ L2 (1) I do.

Therefore, no matter where the car is, the radio wave transmitted from one car is detected by only two sensors at the maximum, and the radio wave from the car 12B is detected by the sensor 15B. And sensor 15
C, but the radio wave from the automobile 12A is detected only by the sensor 15B. This is because, since the distance L3 is larger than the distance L2, the radio wave from the automobile 12A does not reach the sensor 15A according to the above equation (1).

At this time, the value ni (i = 1 to 3) of the number of vehicles stored in each of the sensors 15A to 15C is
N1 = 1, n for 5A, 15B and 15C respectively
2 = 2 and n3 = 0. That is, the sensor 15C detects the radio wave from the automobile 12A, and the sensor 15B detects the radio wave from the automobile 12A following the automobile 15B, while the leading automobile 15B still detects the radio wave from the automobile 15A. Since the detection distance has not been reached, the number of sensors detected by the sensor 15A remains zero.

However, in practice, the number of sensors between the sensors 15B and 15C is not n1 + n2 = 3, but n1 + n2-1 = 2, so it is necessary to correct the number. Therefore, in order to correct the number of vehicles, the sensors 15A to 15C determine the priority order among the sensors 15A to 15C adjacent to each other, and furthermore, immediately before transmitting the number to the central monitoring and control device 3, The data stored in the sensors 15A to 15C are searched, and if a radio wave of the same vehicle is found, the lower priority sensor discards its own data and sends it to the central monitoring and control device 3. Has become.
For example, if a sensor close to the ascending direction (the direction of arrow 13) is determined as a high order, the detection data of the automobile 12A included in the sensor 15C is deleted by itself and set to 0.

Therefore, the number data is sent to the central monitoring and control device 3 as n1 = 0, n2 = 2, n3 = 0. That is, in this case, the sensor 14
This means that two vehicles exist between the two distances A to C.

From this, the central monitoring and control device 3 holds a reference value of the number of vehicles for 2L in advance, and if a number of vehicles exceeding this reference value is received, this section is determined as a congestion section. It should be left.

Here, prevention of the number counting error will be described in more detail with reference to FIG. FIG.
Is an explanatory diagram for explaining the principle of preventing the vehicle counting error,
The three cars 17A, 17B and 17C are connected to the car 1 on the road where the sensors 16A, 16B and 16C are installed.
This shows a situation in which the vehicle is traveling in the direction of arrow 18 with 7C at the head, and the priority order of correcting the number of sensors 16A, 16B and 16C adjacent to each other is the sensor 16A, 1
The following description will be made assuming that the order is higher in the order of 6B and 16C.

Referring to FIG.
B and 17C are cars 17A, 1
7B, the sensor 16C stores data from the vehicles 17A to 17C detected by itself, in the order of the holding state 19A, that is, the vehicle 17A,
The data A and C are encoded in the order of 17C. The data A and C are stored in the central monitoring and control device 3.
Immediately before being sent to (FIGS. 1 and 2), the sensor 16C sends the sensor
In order to inform the vehicle number data held in 6B,
A request signal 20 is sent. The sensor 16B that has received the request signal 20 outputs the detection data 19 that it already holds.
B is sent to the sensor 16C via the path 21.

The sensor 16C has its own detection data 19
A and the detection data 19B of the sensor 16B are compared and searched. In this case, since the sensors 16B hold the vehicles 17A and 17B as the detection data, the same vehicle 1 is included in the detection data 18A of the sensor 16C itself.
The sensor 17C detects that 7A is being detected, and sends the data of only the vehicle 17C obtained by removing the data of the vehicle 17A from its own detection data 18A to the central monitoring and control device 3 (FIGS. 1 and 2).

On the other hand, the sensor 16B has already
A and the central monitoring and control device 3
Is sent to the central monitoring and control device 3
3 cars 17A between 6B and sensor 16C,
17B and 17C are traveling, and the traveling order is also the order of the cars 17C, 17A, and 17B.

Next, a case where the present invention is applied to an actual road will be described with reference to FIG. FIG. 4 is an explanatory diagram showing a road situation capturing a certain moment when the present invention is applied to an actual road. In the figure, two cars are traveling in the down direction, the leading car 22A is passing the position where the sensor 24 is installed beyond the intersection 23, and the following car 22B is approaching the intersection 23. Is shown. In the down direction of the road,
A traffic light 26 is installed together with a display board 25 for displaying road conditions. In such a road situation, first, a radio wave from the leading car 22A is caught by the sensor 24, and then a radio wave from the following car 22B is also caught. The sensor 24 calculates the number of vehicles by capturing radio waves from a plurality of vehicles, that is, vehicles 22A and 22B. After that, the sensor 24 adds the sensor 2 to this number.
4 is sent to the central monitoring and control device 3 with the ID number of 4 added. The central monitoring and control device 3 calculates the traffic congestion rate, the detour, and the like, sends the calculation results as data to the display unit 25, and notifies the driver of the traffic congestion state. For example, if traffic on the road in the straight ahead direction of the automobiles 22A and 22B becomes congested, the display unit 25 displays "During congestion ahead, ×
In the x direction, a thick arrow 27 "is displayed as a detour, and the following automobile 22B turns left according to this display. Further, in the central monitoring and control device 3, the signal control data in the direction toward the detour is sent to the signal control unit 26, thereby controlling the flow of traffic in the direction toward the detour according to the traffic congestion condition, and It will further ease it.

In the embodiment described above, the vehicle is controlled as the traffic control target. However, the present invention is not limited to the vehicle, but can be applied to the control of the traffic of a moving body moving in a predetermined moving path. Needless to say,

[0031]

According to the present invention described above, the traffic congestion state on the moving path can be accurately transmitted to the moving object by accurately detecting the number of moving objects moving in the predetermined section. At the same time as giving an instruction to the detour, appropriate control for the traffic light to the detour can be performed according to the traffic volume. Therefore, the present invention has a remarkable effect in improving the elimination of traffic congestion, and is useful not only for preventing accidents such as rear-end collisions and contact accidents that occur frequently due to traffic congestion, but also can significantly reduce economic loss due to traffic congestion.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an entire traffic flow control system according to the present invention.

FIG. 2 is an explanatory diagram illustrating a method of detecting a traffic congestion rate in the traffic flow control system according to the present invention.

FIG. 3 is an explanatory diagram for explaining a principle of preventing a vehicle counting error according to the present invention.

FIG. 4 is an explanatory diagram showing a road situation capturing a certain moment when the present invention is applied to an actual road;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 radio wave transmitting unit 2 sensor 3 central monitoring and control device 4 data receiving unit 5 storage unit 6 CPU 7 data transmitting unit 8 signal line 9 display unit 10 signal control unit 11 road 12A-B automobile 13 arrow 14 side wall 15A-C sensor 16A ~ C sensor 17A ~ C car 18 arrow 19A ~ B detection data 20 request signal 21 route 22A ~ B car 23 intersection 24 sensor 25 display unit 26 signal control unit 27 arrow

Claims (5)

[Claims] 1. A radio wave transmitting means installed on each mobile body for transmitting a unique radio wave, and a radio wave transmitting means installed at a fixed interval along a moving path on which the mobile body moves to detect a radio wave transmitted from the radio wave transmitting means. And sensor means for detecting the number of the moving objects, calculating means for calculating the traffic congestion rate based on the data on the number of moving objects from the sensor means, and determining and selecting a detour, and calculating by the calculating means. Display means for displaying the determined congestion rate and the selected detour data. 2. The method according to claim 1, wherein the plurality of sensors move along the moving path at an interval such that radio waves from one moving object are detected only by a maximum of two adjacent sensors. 2. The device according to claim 1, wherein the device is installed.
A traffic flow control system according to claim 1. 3. The traffic flow control system according to claim 1, wherein a priority order of the plurality of sensors is determined between two adjacent sensors. 4. The method according to claim 1, wherein when the two adjacent sensors detect the same moving object, the number data for the moving object detected by the sensor having the lower priority is set to 0. The traffic flow control system according to claim 3, wherein 5. A radio wave transmitting means which is installed in each car and transmits a unique radio wave, and which is installed at regular intervals along a road,
Detecting a radio wave transmitted from the radio wave transmitting means, detecting the number of the automobiles, and sensing means for transmitting the number data as radio waves, receiving means for receiving radio waves from these sensor means, A storage unit for temporarily storing the number data from the radio signal received by the reception unit; a calculation unit for calculating a congestion rate based on the data stored in the storage unit and determining and selecting a possible detour; Transmitting means for transmitting the traffic congestion rate calculated by the calculating means and signal control to the detour; display means for displaying the traffic congestion state transmitted from the transmitting means; and a signal control signal transmitted from the data transmitting means. A traffic flow control system comprising: