JP2903408B2 - Traffic signal control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is to change the control depending on the traffic condition of a bus at an installation intersection, to control road traffic safely and smoothly, and to control a bus with priority. The present invention relates to a traffic signal control device.

(Prior Art) Conventionally, this type of traffic signal control device sets a control constant for bus-sensitive control by a constant setting means inside the device,
By using the control constants and further estimating the speed of the bus passing through the intersection, the travel time is set to extend or shorten the display time, thereby performing the bus-responsive control.

(Problems to be Solved by the Invention) In the above-mentioned conventional traffic signal control device, the control constants for bus-responsive control and the travel time are set by manual operation, so that the optimal control constants and travel time for each intersection are determined. It requires a lot of labor, such as the need to investigate traffic. Also, once the set value is set, it does not change many times, so there is a limit in responding to changes in traffic conditions.

The present invention is to solve such a conventional problem in the bus-sensitive control, and an object of the present invention is to provide a traffic signal control device capable of responding to traffic conditions and performing more appropriate bus-sensitive control. is there.

(Means for Solving the Problems) A traffic signal control device according to the present invention includes a sensing means for sensing a bus traveling a certain distance at a sensing position before an intersection, and a bus speed based on a signal from the sensing means. Calculating means for calculating the calculated value, validating the calculated value only when the calculated value is within a predetermined fixed speed range, moving average of the calculated value to obtain an average bus speed; Storage means for storing control constants for sensitive control,
The arithmetic means automatically sets and updates the shortened time and the extended time of the green time for the bus-sensitive control based on the green time set value of the signal lamp, and performs the bus-sensitive control based on the average bus speed. The travel time from the sensing position of the bus passing the intersection to the intersection entrance during the green time to be performed is automatically calculated, and the bus sensitivity control is performed to give priority to the bus passing the intersection.

(Operation) According to the present invention, firstly, it is not necessary to set the control constant for the sensitive control and the travel time, and it is not necessary to update the set value. . Secondly, by updating the traveling time constant every moment, bus-sensitive control corresponding to traffic conditions can be performed at all times, and traffic safety and smoothness can be maintained.

FIG. 1 is a block diagram showing an embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes a microcomputer (hereinafter, referred to as a CPU) which is an arithmetic unit. Reference numeral 2 denotes a set value and control constant storage unit, which is connected to the port 1 of the CPU 1 and has display time set values of blue, yellow, and all red on the main road side, and blue, yellow, and all red on the sub road side, and responsive control. It stores the extended time, the shortened time, and the travel time of the control constants for the main road and the sub-road, and the bus speed data during the green time for each of the current inflow roads to be made sensitive to the main road and the sub-road. Set value and control constant storage unit 2
Is supplied with power from a battery, and its stored contents are retained even during a power failure. The CPU 1 reads the set time and the display time of the control constant storage unit 2, the control constant for the responsive control, and the running time through the port 1, determines the step signal interval, advances the step of the signal control unit 3 through the port 3, and 4 and 5 are controlled to blink sequentially. Further, the CPU 1 receives the bus sensing signal of each route through the port 2, calculates and stores the bus speed, and calculates and stores the running time for predicting the intersection passage timing based on the bus speed data.

Next, the control according to the above embodiment will be described with reference to the flowchart of FIG. The CPU 1 starts controlling the extended time Te and the shortened time Ts with Ts = Te = 0 (step 20). In addition, during the green hours during which the sensitivity is controlled (hereinafter,
The bus speed is calculated based on the signals from the two bus sensors for each of the inflow paths (steps 21 and 22). CPU
1 to automatically determine the travel time t ₁ from the bus speed (step 25). Travel time t ₁ has bus in time until reaching the intersection from the bus sensor installation position, following be time to determine whether to extend the green time for the passage of bus which has passed through the bus sensing position Determined by calculation.

t ₁ = distance from sensor to stop line / v v = d / t where d is the distance between bus sensor 1 and bus sensor 2 and t is the time difference between the respective sensing pulses. In this case, only the data within a certain range of the bus speed data calculated for each inflow channel during the blue time of the sensitivity indication, that is, the data excluding the exceptionally low speed or high speed data, The bus speed is averaged by performing a moving average to obtain an average value by dividing the bus speed to obtain the bus speed (steps 23 and 24).

The shortened time (Ts) is a reference time for determining the minimum blue display time, and the extended time (Te) is a reference time for determining the maximum blue time. Each is determined by the following calculation.

Ts = (set value of green time of sensitive indication) × m Te = (set value of green time of sensitive indication) × l Generally, the fluctuation range of the cycle is considered to be 20 to 30%,
The values of m and l are in the range of 0.2 to 0.3. Usually, the shortening time is shorter than the extension time, and Ts and Te are set as m = 0.2, l = 0.3.
Is calculated and stored in the set value and control constant storage unit 2,
Set and update the shortened time (Ts) and extended time (Te) (steps 27 and 28).

The CPU 1 advances the signal control step based on each display time set value except for the sensitivity indication, and the sensitivity indication advances the signal control unit step based on the sensitivity control control constant, the bus sensor, and the calculation of the travel time. , And sequentially controls the blinking of the signal lights.
That is, within the range of Ts and Te calculated in steps 27 and 28, the timing of the bus reaching the intersection is predicted based on the value of the travel time obtained in the above processing, and the bus is stopped by extending the blue time. If the bus can be passed without passing through the bus, or if the bus is waiting at the intersection, the control of changing the blue display is performed to shorten the blue time on the main road and pass the bus (step 29).

As a result, when there is no bus on the intersection side that is going to pass to the main line while waiting for a traffic light, the main line blue time ends at the minimum of 80% of the set value of the main line blue display time, and there are buses passing to the main line. In case, the maximum value of the main line blue display time setting value is 130
% Ends the green time on the main line. As described above, by determining the extension time and the shortening time based on the blue time setting value of each sensitive indication, 80% to 130% of the blue time setting value of each sensitive indication is determined.
The blue display can be terminated in accordance with the signal waiting state or the passing state of the bus, and the bus-sensitive control giving priority to the passage of the bus can be performed.

FIG. 3 shows an example of the equipment arrangement at the intersection and the signal display at the time of standard, extension, and shortening in this embodiment. In the example of FIG. 3, in the standard time (when there is no sensitivity control), the signal lamp color is sequentially switched according to each display time setting value. Other than the above, the signal lamp color is sequentially switched according to each display time setting value.

As described above, according to the above-described embodiment, the bus passing speed is measured based on the bus sensing signals from the two bus sensors installed at a fixed distance interval, and the traveling time is calculated based on the moving average value of the speed data within a certain range. By calculating, the appropriate running time can be determined by avoiding the inappropriate setting value, and the extension time and the shortening time are determined from the blue time setting value of each response indication, so that the control according to the traffic condition can be performed. This makes it possible to finely perform the bus responsive control based on the bus traffic condition, and to save the labor of setting and changing the constant.

(Effects of the Invention) The present invention has the following effects, as is apparent from the above-described embodiment.

(1) Bus-sensitive control adapted to traffic conditions is possible because the running time is constantly changed in response to changes in traffic conditions.

(2) The setting of the control constant for the sensitive control and the setting of the travel time are not required, and the setting value is automatically updated. Therefore, the labor for investigating the traffic volume and setting and updating the constant can be omitted.

[Brief description of the drawings]

FIG. 1 is a block diagram of a traffic signal control device according to an embodiment of the present invention, FIG. 2 is a flowchart illustrating a control procedure, and FIG. 3 is a diagram showing an example of equipment arrangement and signal display at an intersection. 1 ... microcomputer, 2 ... set value and control constant storage unit, 3 ... signal control unit, 4,5 ... signal lamp.

Claims (1)

(57) [Claims] 1. A sensing means for sensing a bus traveling a certain distance at a sensing position before an intersection, and a bus speed is calculated based on a signal from the sensing means.
Calculating means for validating the calculated value only when the calculated value is within a predetermined fixed speed range, and moving average of the valid calculated value to obtain a bus average speed; Storage means for storing the control constants of the above, wherein the calculating means calculates the shortening time and the extension time of the green time for bus response control,
Running from the sensing position of the bus passing through the intersection to the intersection entrance during the green time, which is automatically set and updated based on the setting value of the green time of the traffic light and performs the bus responsive control based on the average speed of the bus. A traffic signal control device that automatically calculates a time and performs a bus-sensitive control that gives priority to passing a bus intersection.