JPH0337799A - Traffic signal controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is designed to control vehicles during green hours in order to control road traffic safely and smoothly by remotely controlling the vehicle from a central location and changing the control depending on the traffic conditions at the intersection where the vehicle is located. This invention relates to a traffic signal control device that controls so that the passing ratio (number of passing vehicles/green time) is maximized and also controls buses preferentially.

(Prior Art) Conventionally, this type of traffic signal control device sets control constants for sensitive control and vehicle travel time using constant setting means inside the device, and uses the control constants to control vehicle passing during green hours. Sensitive control was performed by extending and shortening the blue display time so that the ratio (number of passing vehicles/blue time) was maximized. In this case, the bus is also counted as one vehicle.

(Problem to be Solved by the Invention) In the conventional traffic signal control device described above, the control constants for sensitive control are set manually, so it is necessary to investigate traffic volume to determine the optimal control constants for each intersection. etc. requires a lot of effort. 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.

In addition, buses are also calculated as vehicles on top of each other and are sensitively controlled so that the ratio of vehicles passing during green hours (number of passing vehicles/green hours) is maximized, so there is a problem when evaluating each passing vehicle from the perspective of the number of people. was there.

The present invention solves these conventional drawbacks in responsive control, and provides a traffic signal control device that responds to traffic conditions and allows buses to pass preferentially, thereby enabling more appropriate control. The purpose is to

(Means for Solving the Problems) The traffic signal control device of the present invention includes means for measuring and storing step signal intervals from the center, means for measuring and storing the number of passing vehicles and vehicle speed, and means for measuring and storing the number of passing vehicles and vehicle speed. It has means for storing the number of passing vehicles, and means for storing each setting value and control constant for sensitive control, and the control constant for sensitive control is stored in step signal interval data measured during a fixed period and during green time for sensitive control. The control pattern is set and updated based on the number of passing vehicles and vehicle speed data, and the control pattern is changed every cycle and every fixed time, and one bus is calculated as n vehicles, and vehicle passing during green hours is controlled responsively. By discontinuing the blue signal at the point when the ratio is maximum, bus-priority vehicle-sensitive control is performed.

(Function) According to the present invention, firstly, there is no need to set control constants for sensitive control, and there is no need to update set values, so the labor of investigating traffic volume and setting constants can be saved.

Second, by constantly updating the control constants for sensitive control, signal control can always be performed in response to traffic conditions, and traffic safety and smoothness can be maintained.

Thirdly, the number of buses is calculated as n vehicles, and responsive control is performed so that the ratio of passing vehicles during green hours (number of passing vehicles/green hours) is maximized, so buses are given priority to pass and one pass is performed. This enables more appropriate signal control that evaluates vehicles based on the number of people in the vehicle.

(Example) FIG. 1 shows an embodiment of the present invention.

In the same figure, the top is a microcomputer (hereinafter referred to as CP).
(referred to as U). Reference numeral 2 is a set value and control constant storage unit, which is connected to port 1 of the CPUI and stores step signal interval data from the center, extension time and shortening time of control constants for sensitive control, and sensitivity of main roads and secondary roads. Vehicle speed data, the number of passing vehicles, and the number of passing buses during the current green time on the incoming road side are stored. The set value and control constant storage section 2 is powered by a battery, and the stored contents are retained even in the event of a power outage. The CPU receives the remote signal 1 step signal from the center through port 2, measures the step signal interval, advances the step of the signal control unit 3 through port 3, and sequentially controls the signal lamps 4 and 5 to blink.

Further, the CPUI receives and receives bus sensing signals and vehicle sensing signals through port 4 to measure traffic conditions.

Next, the control according to the above embodiment will be explained with reference to the flowchart shown in FIG. CPUI has extended time T
e. Start control of the shortening time Ts at T s = Te = O1 (step 20), measure the stepping signal interval from the center and update and store it every cycle (step 21), and perform responsive control for each work cycle. The vehicle speed V is calculated by measuring the distance between vehicles on the inflow road side, the number of passing vehicles, and the number of passing buses during the green time (hereinafter referred to as "sensing phenomenon").
23). The CPUL automatically determines the travel time T based on the traffic conditions obtained from the sensor.

The traveling time T is the time required for the vehicle to travel from the sensor installed upstream of the intersection to the stop line position,
From FIG. 3, if the distance between the sensor 1 and the sensor 2 is d, and the time difference between the respective sensing pulses is t, then it is determined as follows.

T = Distance from the sensor to the stop line/V v = d/11 This traveling time T is updated depending on the traffic situation, but the condition in this case is that the number of vehicles detected in one cycle is at least the minimum number (about 5 vehicles) Under this condition, the data is averaged by calculating the moving average of speed data within a certain range (steps 25 and 26). Based on this travel time T, the efficiency of vehicle passage (number of passing vehicles/display time) from the current time t to T seconds later is as follows.

At present...Number of detected devices up to (t-T)/l1 second later...Number of detected devices up to (t-T+1)/(t+
1) 2 seconds later...Number of detected devices until (t-T+2)/(t+2)T seconds later......
・・・・・・Number of sensing devices up to t/(t+T) CPUI
predicts the vehicle passing efficiency (number of passing vehicles/display green time) at the stop line position from the sensing pulses from the detectors for general cars and buses installed upstream of the intersection, and predicts the efficiency until the point when the efficiency is maximum. Show blue. At this time, move the bus stand to vehicle n.
However, converting 1 bus into n vehicles is only for the latest buses, and in the past it is calculated as 1 vehicle. Appropriate control is possible. Based on the traffic volume obtained from the sensor and the travel time from the sensor's position to the stop line, the CPU determines when is the best time to terminate the sensitive ladder at the present moment, 1 second, 2 seconds, or N seconds in the future. Predict whether the effect will be large and discontinue blue when the effect is maximum. At this time, by calculating the travel time by dividing the distance from the sensor stop line by the average vehicle speed obtained from the sensor, it is possible to perform control in accordance with the situation.

The shortening time (Ts) is the reference time for determining the minimum blue display time, and the extension time (Te) is the reference time for determining the maximum blue display time, so it is a fixed cycle period (about 10 cycles).
(Step 27) Based on the stepping signal interval data from the center of (data corresponding to the green time of the sensitive appearance) (step 27), each is calculated and determined as follows.

T s = (average value of step signal interval data)XmT
e = (average value of step signal interval data)
The value of is in the range of 0.2 to 0.3. Usually, the shortened time is shorter than the extended time, m=0.2. Set n=063, calculate Ts and Te at regular intervals, store them in the set value and control constant storage section 2, and set and update the shortened time (Ts) and extended time (Te) (steps 28 and 29).
.

The CPU is controlled by the step signal from the center except for the sensitive display.
In the sensitive display, the signal control section advances the steps by self-stepping based on the control constant for the sensitive control and the calculation result of the vehicle passing efficiency, and the signal lamps are sequentially controlled to blink (step 30).
). In this way, by determining the extension time and shortening time based on the step signal interval data from the center, it is possible to reduce the number of vehicles passing during the green time between 80% and 130% of the average green time required for the previous fixed cycle. The blue display can be ended when the ratio is at its maximum, allowing control to be more tailored to traffic conditions. Figure 3 shows the arrangement of equipment at an intersection in this embodiment and examples of signal displays during standard, extended, and shortened times.

In the example shown in Figure 3, during standard time (without sensitive control), the signal light color changes sequentially according to the stepping signal from the center, and when extending or shortening, the sensitive control changes the blue, yellow, and all-red signals automatically. Otherwise, the color of the signal light changes sequentially based on the step signal from the center.

By performing control using the same cycle time during standard time, extension, and shortening, it is possible to perform remote control in which the starting point in front of the main line is always synchronized with the center.

In this way, according to the above embodiment, the number of passing vehicles is measured, and -
By ignoring the temporal value and obtaining the average vehicle speed,
To avoid inappropriate travel times, enable appropriate predictions, and perform control in line with traffic conditions by determining extension and shortening times from the average value of the step signal interval from the center. It is possible to perform smooth control of traffic volume at all times based on traffic conditions, and to perform sensitive control that allows buses to pass with priority, and it also saves the effort of setting and changing constants. .

(Effects of the Invention) As is clear from the above examples, the present invention has the following effects.

(1) Since the control constants for responsive control are constantly changed in response to changes in traffic conditions, control adapted to traffic conditions is possible.

(2) Setting of control constants for sensitive control is no longer necessary, and the set values are automatically updated, so the effort of investigating traffic volume and setting and updating constants can be saved.

(3) More appropriate control can be achieved by allowing buses to pass preferentially and evaluating passing vehicles in terms of the number of people.

[Brief explanation of drawings]

Fig. 2 is a block diagram of a traffic signal control device according to an embodiment of the present invention, Fig. 2 is a flowchart for explaining the control procedure, and Fig. 3 is an example of equipment arrangement and signal display at an intersection. 1...Microcomputer, 2...Setting value and control constant storage unit, 3...Signal control unit, 4,
5...Signal lamp.

Claims (1)

[Claims] Means for measuring and storing the step signal interval from the center, means for measuring and storing the number of passing vehicles and vehicle speed, means for storing the number of passing buses, and control constants for each set value and responsive control. The control constant for the responsive control is set and updated based on the step signal interval data measured during a certain period and the number of vehicles passing during the green time and vehicle speed data for the responsive control. In addition to changing the pattern every cycle and every fixed time, one bus is calculated as n vehicles, and the green is turned on at the point when the ratio of vehicles passing during the green time (number of passing vehicles/green time) to be responsively controlled is maximum. A traffic signal control device characterized by performing vehicle-sensitive control of a bus priority type by canceling the signal.