JPS6049500A - traffic signal control device - 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 (Field of Industrial Application) The present invention relates to a traffic signal control system for ensuring the safety and smoothness of road traffic.

(Constitution of conventional example and its problems) FIG. 1 shows a method of offset synchronous control of a solid device and a terminal signal control engine in a conventional traffic signal control system. The configuration of this conventional example will be explained below based on FIG. 1. In Fig. 1, 1 indicates the operation timing of the cycle counter of the solid device which is the reference for the signal control cycle, and 1 is defined as 1% of one cycle of signal control.
It is a 0-decimal counter. 2, 3.4 indicate the operation timing of the terminal signal l, 2 is the reference cycle counter, 3 is the follow-up cycle counter, 4 is each timing of display of the signal light color, 5, 6゜7 is the terminal signal 2 5 is a reference cycle counter, 6 is a follow-up cycle counter, and 7 is each timing for displaying the signal light color.

Next, the operation of the above conventional example will be explained. In Figure 1, by sending the second value of cycle counter 1 and the timing of count 0 from the solid equipment to each terminal signal, the reference cycle counters 2 and 5 of each terminal are made to be the same as the central cycle counter 1. It is counted based on the cycle and timing.

Further, from the solid equipment to each terminal signal, an offset value 01102 and a sgerritt value SAI.

By sending SBI, SA2, and SB2, in the terminal signal 1, the timing of the count O of the follow-up cycle counter 3 matches the count I of the reference cycle counter 2.
The offset follow-up operation is performed by expanding or contracting the follow-up cycle counter 30 cycle length so that the follow-up cycle is at time O (in the case of 0'1 = 10chi), and when the follow-up operation is completed, the solid device is Reference point of cycle counter 1 (count 0
The main line blue of the terminal signal l starts with an offset value of 01 from the offset value 0 point), and the signal control is performed by allocating the time of the main line and crossing according to the split values SAI and SBI. Similarly, the main line blue of the terminal signal 2 starts with an offset value of 02 from the reference point, and the signal control is performed by allocating the time of the main line and crossing using the Sgerritt values SA2 and SB2.

However, in the above conventional example, it is necessary to synchronize the cycle counter of the solid device and the reference cycle counter of the terminal signal every time the signal control cycle changes, and when the number of terminal signals increases, In this case, the time required for data transmission and reception increases and the procedure becomes complicated. In particular, as is clear from Figure 1, in order to keep the cycle counter deviation between the center and the terminals within 1 inch, it is necessary to instantaneously transmit and receive data between the center and the terminals at the time of every cycle change. This was a major problem in the system configuration. If the communication between the center and a specific terminal is still interrupted due to a failure, etc., if the cycle value changes even once, the offset synchronization between the center and the terminal will no longer be established, and the offset synchronization between the center and the terminal will be lost, and the offset synchronization between the center and the terminal will be lost and the cycle value will be stored in advance in the terminal signal. Fail-safe constants (cycle, sgerit, offset)
The disadvantage was that the effectiveness of the method was halved.

(Object of the Invention) The present invention eliminates the drawbacks of the conventional example described above, and reduces the time spent transmitting and receiving data for offset synchronization between a solid device and a plurality of terminal signals. At the same time, the purpose is to simplify the procedure and further improve the effectiveness of fail-safe control when communication between the center and the terminals is interrupted.

(Structure of the Invention) In order to achieve the above object, the present invention includes an N-ary counter that counts at n-second intervals regardless of the signal control cycle in a solid device, and - individual control constants (cycles, cycles, etc.) for each terminal signal. The control constant and the count value of the N-ary counter are sent to each terminal signal, and each terminal signal is preset with the received count value. an N-ary counter with the same interval and the same period length as the solid device, and a reference cycle counter whose count value becomes φ at the time of a specific count of the N-ary counter, with the received cycle as the period length;
By arranging a follow-up cycle counter whose cycle length is the received cycle value and whose count value is the point in time when the reference counter counts the offset value received from the solid device, it is possible to This reduces the time required for data transmission and reception between the center and terminals, simplifies communication procedures, and improves the effectiveness of fail-sale control when communication between the center and terminals is cut off.

(Description of Embodiment) The configuration of an embodiment of the present invention will be described based on FIG. 2.

In the figure, 1 indicates the operation timing of the N-ary counter of the solid device, and the cycle of counting at 1 second intervals is, for example, 1 hour, N = 3.60, regardless of the signal control cycle.
The count is set to 0. 2゜3.4.5 shows the operation timing of the terminal signal l, and 2 is the terminal N-ary counter that counts at the same interval (1 second) and the same period length (1 hour) as the N-ary counter of the solid device. (N=3.600)
, 3 indicates a reference cycle counter in decimal notation, 4 indicates a follow-up cycle counter in decimal notation, and 5 indicates each timing of display of the signal light color.

6.7 and 8.9 indicate the operation timings of the terminal signal 2, and correspond to 2, 3, and 4.5 of the terminal 1, respectively.

Next, the operation of the above embodiment will be explained. In FIG. 2, the count value of N-ary counter 1, for example 2, 4, is sent from the solid device to terminals 1 and 2 at each timing.

Each terminal N-ary counter 2, 6 is synchronized with the central N-ary counter l by presetting it with the received count value.
It will start counting the same number of seconds. Further, from the solid device, for terminal 1.2, the cycle value C1 offset value 01.02, the Sgerit value SAI, SA2. SBI
, S, and B2 are sent at regular time intervals. Each terminal presets the reference cycle counters 3 and 7 with the remainder value obtained by dividing the current count value of the N-ary counters 2 and 6 by the received cycle value (second value). For example, if the terminal machine receives a cycle value of 120 (seconds) and the current count value of the N-ary counter 2 is 1215, the following calculation is performed.

1215÷120='lO remainder 15 Therefore, the remainder value 15 obtained by dividing the reference sidal counter 3 is presented.

Furthermore, the cycle value 1 which received the reference cycle counter 3
In order to use a decimal counter with a cycle length of 20 (seconds), it is counted at intervals of 1 or 2 seconds, which is one cycle value.

Through the above operations, the reference cycle counter 3 is set to the current count value assuming that the count value φ is calculated backward from the current count value of the N-ary counter 2 and ≠, and the synchronized state is continued. It turns out.

By performing the above operation in the terminal 2 as well, the cycle counters 3 and 7 corresponding to A of each terminal count at the same timing (same count value). It is a 100-decimal counter whose period length is the cycle value received from the solid device.

In other words, in the conventional example, by instantly sending data from a solid device to each terminal at the time of cycle change, the reference cycle counter of each terminal (Fig. 1, 2゜5) is changed to the central cycle counter (Fig. 1, 1). In contrast to the same timing, in this embodiment, data transmission and reception between the central terminal and the central terminal at the same rate of one hour is performed sequentially to each terminal.
Timing adjustment is performed at each terminal signal, and each terminal's reference cycle counter (Figure 2, 3.7
) are counted at the same timing.

After the operation timing for each terminal in the standard cycle is obtained in the manner described above, the operation is exactly the same as in the conventional example. That is, the timing of the count O of the follow-up cycle counters 4 and 6 is set to be the count 20 and 10 of the reference cycle counter (01-20
%, 02-10%), the cycle length of each follow-up cycle counter is expanded or contracted to perform offset follow-up operation, and when the follow-up operation is completed, the reference cycle counter and follow-up cycle counter are the same as shown in Figure 2. The cycle length is counted by the offset value and D2 from the reference cycle counter, respectively.

Each terminal signal operates with the count value φ of the follow-up cycle counters 4 and 8 as the start before the main line, the period length as the signal control cycle, and the stop value allocates the time between the main line and the intersection, and the reference cycle counter The control shown in the lamp color display timings 5 and 9 is performed.

(Effects of the Invention) The present invention has the above-described configuration, and provides the following effects.

In this embodiment, in order to perform offset synchronization control of the solid equipment and each terminal signal engine, an N-ary counter that counts at intervals of seconds is used in the solid equipment and each terminal equipment, and It is only necessary to perform communication for adjusting the count, and if a crystal oscillator is used as the oscillation source for counting, the error is very small, so it is sufficient to perform communication at an interval of one root every several hours. The time required for this is therefore significantly reduced. Moreover, by sending the count value from the solid device to each terminal individually, it is possible to easily match the count values between each other, and the procedure is simple, especially when the number of terminals increases. Even if the number of devices increases significantly to several hundred or more, it has the advantage that errors due to communication delays do not occur.

In addition, even if communication is temporarily cut off between the center and a specific terminal, by memorizing the changes in values sent from the solid equipment to each terminal signal for several minutes in advance, the internal two-ale safe constant can be maintained. This has the advantage that offset synchronization control can be maintained for a long period of time.

Furthermore, if the fail-safe constant of each terminal signal, the point at which the cycle value is changed, and the terminal N-ary counter are set to a power outage compensation circuit system (battery backup), if a communication disconnection and a power outage occur at the same time at a particular terminal, However, as soon as the power is restored, the offset tracking operation is performed immediately.
There is an advantage that system control can be continued by performing offset synchronization between adjacent terminal signal boards.

[Brief explanation of drawings]

FIG. 1 is a timing diagram showing an offset synchronization control method between a conventional traffic signal control system and a terminal device, and FIG. 2 is a timing diagram showing an offset synchronization control method for a traffic signal control system according to an embodiment of the present invention. FIG. ■...Operation timing of the cycle counter of the solid device, 2...Reference cycle counter of the solid device, 3...
Follow-up cycle counter, 4... Each timing of signal light color display, 5... Reference cycle counter of terminal signal,
6...Following cycle counter, 7...Each timing of signal light color display, 8...Following cycle counter, 9...
... Each timing of signal light color display. Figure 1 Figure 2

Claims (2)

[Claims] (1) An N-ary counter that counts at an interval of n seconds, an individual control constant group (cycle, pulse, and offset) for multiple terminal signals in a solid device, and an N-ary counter in the solid device for each terminal signal. An N-ary counter that counts at the same interval and the same period length is designed, and individual control constants are sent from the solid device to each terminal signal, and the count value of the N-ary counter is also sent at any time. , each terminal signal pre-centres the internal N-ary counter with the received count value, has both a reference cycle counter and a follow-up cycle counter whose period length is the received cycle value, and pre-centres the internal N-ary counter with the received count value. The counter is reset to a count value φ at a specific count time, and offset tracking is performed so that the count value of the follow-up cycle counter is set to φ when the reference cycle counter counts the received offset value, A traffic signal whose special mission is to control the traffic signal system by setting the period length of the cycle counter as the signal control cycle, setting a specific count point as the start of the main line green time period, and controlling the display time based on the received strip value. Signal control method. (2) The fail-safe control constants (cycle, cycle,
When it becomes impossible to receive control constants from the solid device at regular intervals, the fail-safe control constants are used to control the traffic signal system. A traffic signal control system according to claim (1), characterized in that the traffic signal control system performs control.