JPH0275099A - Traffic signal control signal - Google Patents

Abstract

PURPOSE:To attain the bus sensitive control suitable for a traffic condition by calculating the speed of the bus from a bus sensitive signal, automatically determining the travelling time, further, setting the control constant for the bus sensitive by stepping signal interval data from the center measured in the constant time, updating it and always becoming an optimum value. CONSTITUTION:The title signal has means 1 and 2 to measure and store the stepping signal interval from a center, means 1 and 2 to measure and store the bus speed and means 1 and 2 to store respective set values and the control constant for controlling the bus sensitive. The control constant for controlling the bus sensitive is set and updated based on the inter-stepping signal interval data measured for a constant period, a control pattern is changed for a period and for a constant time and based on the speed data of the bus to pass during the blue time to execute the bus sensitive control, the travelling time is automatically set and the bus sensitive control is executed. Thus, the setting of the control constant for sensitive and the travelling time and the updating of the set value are not made necessary, the bus sensitive control corresponding to the traffic condition can be executed and the safety and smoothness of the traffic can be maintained.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is remotely controlled from a central location and changes control depending on the bus traffic situation at the intersection where it is installed, thereby safely and smoothly controlling road traffic and giving priority to buses. The present invention relates to a traffic signal control device for controlling traffic lights.

(Prior Art) Conventionally, this type of traffic signal control device sets bus-sensitive control constants using constant setting means inside the device, uses the control constants, and predicts the speed of a bus passing through an intersection. Bus-sensitive control is performed by setting the running time and extending or shortening the display time.

(Problem to be Solved by the Invention) However, in the conventional traffic signal control device described above, the bus-sensitive control constants and travel time are set by manual operation, so it is difficult to determine the optimal control constants and travel time for each intersection. It requires a lot of effort, as it requires a traffic survey. Furthermore, since the set value cannot be changed many times once it has been set, there is a limit to how well it can respond to changes in traffic conditions.

The present invention solves such conventional problems in bus-sensitive control, and aims to provide a traffic signal control device that can respond to traffic conditions and perform more appropriate bus-sensitive control. be.

In order to achieve the above object, the present invention calculates the speed of the bus from the bus detection signal and automatically determines the travel time, and further calculates the speed of the bus from the center measured within a certain period of time. A bus-sensitive control constant is set using step signal interval data and updated to always have an optimum value.

(Function) Therefore, the present invention has the following functions and effects.

(1) It is not necessary to set the sensitive control constants and travel time, and there is no need to update the set values, so the labor of investigating traffic volume and setting constants can be saved.

(2) By constantly updating the sensitive control constants and travel time, bus sensitive control can always be performed in response to traffic conditions, and traffic safety and smoothness can be maintained.

(Example) The first figure shows an embodiment of the present invention.

In Figure 1, 1 is a microcomputer (hereinafter referred to as C
(referred to as PU), 2 is a setting value/constant storage unit, and C
I) Connected to baud 1-1 of U3, step signal interval data from the center of the tower, extended time, shortened time, travel time, and sensitive indications of the sensitive control constants of the main road and secondary road. Bus speed data during green time for each inflow route is stored. The set value/constant storage section 2 is supplied with power by a battery 6, and the stored contents are retained even in the event of a power outage. CP tJ
]- receives a remote signal and a step signal from the center through the port 2, measures the step signal interval, advances the steps of the signal control section 3 through the boat 4, and controls the signal lamps 4.5 to blink in sequence. In addition, CP t, , J i receives the bus sensing signal through the buses 1-3, calculates and stores the bus speed, and calculates and stores the traveling time based on the bus speed data to predict the crossing timing. FIG. 2 is a flowchart 1-1 showing the control procedure of the embodiment described in J-1. FIG. 3 is a diagram showing the arrangement of equipment at an intersection and an example of signal display.

Next, control according to the above embodiment will be explained with reference to flowchart 1- in FIG. 2. CP t, J 1 are extension time Te and reduction time Ts, respectively, Ts=Te=O
, step (hereinafter referred to as S) 20)
, measures the step signal interval from the center and stores the double cycle update (821), and also measures the signal from the two bus sensors for each inflow path during the green time (hereinafter referred to as "sensitivity display") for sensitive control. Calculate the bus speed based on the signal (S22.23), CP
U1 automatically determines the traveling time t1 from the bus speed (S26), and the traveling time t4 is the time it takes for the bus to reach the intersection from the bus sensor installation position, and allows the bus that has passed the bus sensing position to pass. This is the time for determining whether or not to extend the green time for the purpose of the event, and is calculated and determined as follows.

t1=distance from sensor to stop line/Vv=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, the bus speed is leveled by taking a moving average of only the data within a certain range of the bus speed data calculated for each inflow path during the green time of the responsive appearance (S24.25
).

The shortened time (Ts) is the standard time for determining the minimum blue display time, and the extended time (Te) is the standard time for determining the maximum It waiting time. Based on the step signal interval data (data corresponding to the green time of the sensitive appearance) (828), each is calculated and determined as follows.

Ts = (average value of step signal interval data) .2
-0.3 range. Usually, the shortening time is shorter than the extension time, and Ts and T are set as rn=0.2゜1=0゜3
Calculate e at regular intervals.

It is stored in the set value/constant storage unit 2, and the shortened time ("1."
s ) and extension time (Te) (82
9.30).

CPU 1 advances the steps of signal control based on the step signal from the center except for the sensitive display, and the sensitive display is self-stepped based on the sensitive control constant, bus sensor, and calculation of travel time. The steps of the signal control section are advanced to sequentially control the signal lamps to blink (S31).

As a result, if there is a bus waiting for a signal on the intersection side and there is no bus trying to pass on the main line side, the main line green time will end at the shortest time of 80% of the average step signal fffl interval of the previous response period. , if there is a bus passing on the main road side, the average step of the response during the previous fixed period is the longest 1 of the No. 4 interval.
Blue time on the trunk line ends at 30%. In this way, by determining the extension time or shortening time based on the progressive signal interval data from the center, the bus can wait for a signal or pass through between 80% and 130% of the average green time required for the previous fixed cycle. The blue display can be turned off depending on the situation, and bus-sensitive control that prioritizes bus traffic is possible.

Figure 3 shows the equipment arrangement at the intersection in this embodiment.

Examples of standard, extended and shortened signal presentations are shown. In the example shown in Fig. 33 (A), during standard time (no sensitive control), the signal light color changes sequentially by the stepping signal from the center, and when the bus is extended or shortened, the sensitive display changes to blue, yellow, and blue due to the bus sensitive control. All red lights are automatically stepped, and other than that, the signal light color changes sequentially by the step signal from the center. This allows remote control to be performed in which the starting point in front of the main line is always synchronized with the center by controlling the same cycle time during standard time, extension, and shortening.

As described above, according to the embodiment 1-, the bus passing speed is measured based on the bus detection signals from two bus detectors installed at a fixed distance interval, and the bus passing speed is measured based on the moving average value of the speed data within a certain range. By calculating the travel time using the 51Z average value of the stepping signal interval from the center, it is possible to avoid inappropriate setting values and determine the appropriate travel time. Control can be performed in accordance with the situation, bus sensing control can be performed in detail based on bus traffic conditions, and the labor of setting and changing constants can be saved.

(Effects of the Invention) As is clear from the Examples described in -, the present invention has the following effects.

(+) Bus-sensitive control adapted to traffic conditions is possible because the sensitive control constants and travel time are constantly changed in response to changes in traffic conditions.

(2) Sensitive control constants and running time settings are no longer required,
Since the set values are automatically updated, it is possible to save the effort of investigating the number of traffic, setting constants, and updating.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a traffic signal control device according to an embodiment of the present invention, and FIG. 2 is a flowchart showing the control procedure]-
1. Figure 3 shows an example of the equipment arrangement and signal display at an intersection. 1-... Microcomputer (CPU), 2...
・Setting value/constant storage section, 3...Signal control section, 4, 5.
...Signal lamp, 6...Battery. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 2 Figure 3 (A)

Claims (1)

[Claims] The controller has a means for measuring and storing step signal intervals from the center, a means for measuring and storing the bus speed, and a means for storing each setting value and control constant for bus-sensitive control, The constant is set and updated based on the step-to-step signal interval data measured during a certain period, and the control pattern is changed every period and every certain time, and bus-sensitive control is performed based on the speed data of passing buses during green time. A traffic signal control device that automatically sets a travel time based on the bus and performs bus-sensitive control.