JPS5953600B2 - Traffic signal congestion control system and congestion detection device - Google Patents

Description

[Detailed Description of the Invention] This invention improves traffic signals at intersections on routes where the traffic volume in normal times is mostly determined by the time of day, but on specific days such as during the tourist season when the traffic volume increases significantly and vehicles are congested. The present invention relates to a road traffic congestion detection device used in a traffic signal control method that alleviates traffic congestion by controlling signals according to traffic conditions.

Traffic volume during normal times is mostly determined by the time of day, but on certain days such as Sundays, holidays, and tourist seasons, on routes where traffic volume increases significantly and vehicles are congested, during normal times,
A simple multi-stage signal control system is sufficient.

However, during specific periods such as Sundays, holidays, and tourist seasons, traffic volume temporarily increases and vehicles become congested, which can lead to irritable driving, traffic accidents such as rear-end collisions, exhaust gas, noise, etc. There are many problems such as not only increasing traffic pollution but also increasing fuel and other expenses.

Therefore, computer-based traffic control systems and automatic sensing signals have been developed as traffic signal control systems that change the control parameters of signals at important intersections such as arterial roads depending on traffic volume.

However, the above method requires the installation of a computer and the installation of an automatic sensing controller in each terminal controller.

There is also a control method called traffic flow sensing, which is simpler than automatic sensing, but it still requires a central processing unit that calculates the traffic volume and changes the cycle and pattern. There are problems such as:

For this reason, the above-mentioned traffic control systems, automatic sensing systems, and traffic flow sensing devices are suitable for important intersections on arterial routes with high traffic volumes and intersections in urban areas where traffic volume constantly changes widely. It is unsuitable as a traffic signal control system for short routes where traffic volume increases significantly on very limited and specific days such as Sundays, holidays, and tourist seasons.

Therefore, even on routes or main roads that can normally be handled by simple multi-stage signal control, signals at intersections where traffic volume increases and vehicles are congested on specific days such as Sundays, holidays, or tourist seasons are adjusted according to the traffic congestion situation. A traffic signal control method is conceivable that is configured to alleviate traffic congestion on congested routes through signal control.

The present invention has been made based on the above-mentioned circumstances, and provides a road traffic congestion detection device for use in the above-mentioned traffic signal control method.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1a is a plan view showing the situation of representative intersections on the route provided for explanation of this invention, and in the figure, reference numeral M
is a road where vehicle C is congested at a specific hour. For example, let Ma be the up lane of road M, and Mb be the down lane.

Further, m is a road that intersects at right angles with the road M at the representative intersection N.

At the representative intersection N, a vehicle signal P' for road M, a vehicle signal Q for road m, a pedestrian signal Pm for crossing road m, and a pedestrian signal QM for pedestrians crossing road m are installed, respectively.

As shown in Figure 3a, the above signal has, for example, one signal period of 10 floors, and the pedestrian signal Pm has a green G on the 1st floor, flashing on the 2nd floor, red R from the 3rd floor to the 10th floor, and a vehicle signal. P is blue G for the 1st to 3rd floors, yellow Y for the 4th floor, 5
The pedestrian signal QM is red R from the 6th floor to the 10th floor, the pedestrian signal QM is blue G at the 6th floor, flashing at the 7th floor, red R from the 8th floor to the 5th floor, and the vehicle signal Q is blue from the 6th floor to the 8th floor. G, the 9th floor is yellow Y, and the 10th to 5th floors are red R.

The simple multi-stage wired system main unit A is installed at a representative intersection of the route, and controls the signal lamp device of the representative intersection by carving the signal display ladder of the representative intersection, and at the same time rises when the pedestrian signal Pm starts blinking and displays the pedestrian signal QM. A system periodic signal that falls at the start of blinking is sent to a plurality of simple multi-stage wired system slave units B.

Then, the simple multi-stage wired system slave unit B is installed at an intersection other than the representative intersection of the route, receives the system periodic signal, and after a predetermined offset time from the rising and falling points, the pedestrian signal Pm flashes and the pedestrian The signal QM starts blinking, and the signal lights at the intersections installed are controlled in a predetermined signal pattern based on these start signals.

Vehicle C at the above representative intersection N has a green light P in the direction of travel.
G flows, and almost no traffic accumulates between intersections N and N just before the signal changes.

However, during traffic jams, the amount of vehicles C increases and the vehicle speed slows down, causing vehicles C to accumulate between intersections N even before the green light PG ends.
Vehicle C with slow vehicle speed near the intersection on the near side of up lane Ma
A line forms.

Therefore, a road traffic congestion detection device for detecting congestion of vehicle C is attached to the simple multistage wired traffic signal controller consisting of the simple multistage system main unit A and slave unit B, and the road traffic congestion detection device detects congestion of vehicle C. When the simple multi-stage system main unit A receives the traffic jam detection signal, the green signal PG waiting time on the traffic jam side is normally displayed.
), the green signal PG waiting time is extended, and one signal period is lengthened (therefore, the total number of steps becomes 11 steps instead of 10 steps), and as a result, the system periodic signal whose rise time is delayed by one step is: The signal is sent to the simple multi-stage system slave unit B (FIG. 3b), thereby controlling the green signal PG of the simple multi-stage traffic signal controller.

FIG. 2 is a circuit diagram of the road traffic congestion detection device according to the present invention, in which a sensor 1a using an ultrasonic type or the like to detect slow vehicles C in traffic congestion is installed at a predetermined position behind the intersection N in the up lane Ma. do.

A signal from the sensor 1a is connected to a counter 3a and a glue set input via a NAND circuit 2a.

The NAND circuit 2a is inputted with a check ladder CH (a pulse that appears once in one signal period) from the signal generator 4, and the counter 3a is supplied with a reference signal every second from the signal generator 4. The clock signal CL is manually generated.

The check ladder CH is a step that counts the sensing time of the sensor 1a, and occurs from the end of the flashing green pedestrian signal Pm at the intersection N where the vehicle C passing in the direction of the traffic jam,
The pulse time is typically 6 to IO seconds.

That is, the ladder is normally set from when the pedestrian signal Pm in the direction of the traffic jam becomes red R until the signal for the vehicle C in that direction becomes yellow Y.

(See Figure 3) When the tarock signal CL from the counter 3a reaches a preset count value (3 seconds in this embodiment), the flip-flop 5a is set, and the Q of this flip-flop is set to a "1" signal. This is then output as a sensing memory signal.

The sensed and stored signal is input to an up/down counter 8.

On the other hand, this up/down counter 8 has a signal generator 4
Memory ladder CM from is input.

The memory stage CM is a single pulse that is generated successively after the end of the check stage, and is a signal for counting the number of sensing memories, and when this signal is input, the sensing memory signal from the flip-flop 5a is input. If there is no sensing memory signal, the up-down input of the up-down counter 8 will become a °“1” signal and the counter will increment by 1. Conversely, if there is no sensing memory signal, the up-down input of the up-down counter 8 will become a °“0” signal.
“It becomes a traffic light and the counter is decremented by one, and normally it is the step of the yellow light Y of vehicle C in the direction in which traffic congestion is detected.

(See Figure 3) The up/down counter 8 is configured to perform addition when the up/down input is "1" and subtraction when the up/down input is "0".

On the other hand, a reset signal R3 for resetting the sensing memory signal is inputted from the signal generator 4 to the flip-flop 5a, and is reset at a timing after counting the sensing memory signal. , which is normally the ladder when the signal of the vehicle C in the direction of traffic congestion detection is red R, is one pulse that is generated successively after the end of the memory ladder CM.

When the up-down counter 8 counts the sensed and stored signals up to a preset number of traffic jam detection times (three times in this embodiment), the flip-flop 9 is set and output as a traffic jam detection signal.

When this traffic jam detection signal is output, it is sent to the count prohibition input terminal CK of the up-down counter 8 via the AND circuit 10 along with the up-count by the subsequent sensing memory signal.
, input to ENA and stop up-counting.

The traffic jam detection signal controls the green signal PG in the traffic jam direction, but when the traffic jam is resolved and the up/down counter 8 counts down and the traffic jam detection number returns to "0", Since the reset signal is input to the flip-flop 9, the traffic jam detection signal is eliminated.

Further, when the traffic jam detection signal is output, if it is desired to hold this signal for a certain period of time, the switch J3 is opened to activate the lock timer 12.

At this time, the traffic jam detection signal is not activated until the clocking end signal of the lock timer 12 is output, even if the up/down counter 8 counts down and the traffic jam detection count is "0".
Since the AND circuit 11 is not configured and therefore the reset signal is not input to the flip-flop 9, it is output.
maintain the state of

When the lock timer 12 outputs a count end signal, the number of traffic jam detections set by the up/down counter 8 becomes "0".
'', the input of the AND circuit 11 is formed and the flip-flop 9 is reset, so that the traffic jam detection signal is eliminated.

If the sensor used is a sensor with a narrow sensing range, such as an ultrasonic type, the sensing range may get stuck between vehicles during traffic jams and may not output a sensing signal even in traffic jams. Installing multiple sensors along the direction of travel to increase the accuracy of sensing traffic jams can be used as appropriate, and when two sensors 1a and 1b are installed, sensor 1a and the recess can be used appropriately depending on the traffic congestion situation. The switch J1 is closed when both the rain sensors 1a and 1b are operated at the same time and the time during which the rain sensors 1a and 1b are sensing is counted and the counters 3a and 3b are operated together. It has become.

Further, when Jl is opened, the sensors 1a and lb are operated separately, and the counters 3a and 3b can be operated separately.

The output signals of flip-flops 5a and 5b are input to an AND circuit 6 and an OR circuit 7, respectively.

Here, when the switch J1 is opened and the sensing times of the sensor 1a and the sensor 1b are measured separately, that is, the sensing time of the sensor 1a and the sensing time of the sensor 1b are both detected. Connect to the AND circuit 6 side a when you want to input the memorized traffic jam count.

In addition, the switch J2 is connected to the OR circuit 7 when it is desired to input the traffic congestion count when either the sensor 1a or 1b senses and stores it.
Connect to the side.

Next, a traffic signal controller with a system periodic signal/bang signal sending device of a simple multi-stage system main unit equipped with the above traffic jam detection device is as follows:
When the traffic jam detection signal is received, as shown in Figures 3 and 4, the vehicle C in the traffic jam detection direction adds one flight of stairs to the green time period to lengthen the green time and extend the system cycle to match the traffic jam cycle. do.

That is, the circuit configuration is as shown in FIG. 4, when there is no traffic jam detection signal, the input of the inverter 13 is "0" and its output is a "1" signal, and the input of the AND circuit 14 is formed on the second floor. A skip signal is output and the second stage is skipped.

The grid periodic signal is created to switch on and off at the point when the flashing pedestrian signal Pm starts, so if the second floor skips and operates, the rise of the grid periodic signal will be as shown by the dotted line in Figure 3. It starts from the part and operates in a normal cycle, which is not a traffic jam cycle.

(Fig. 3a) On the other hand, when the traffic jam detection signal is input, the output of the inverter 13 becomes "0", so the skip signal from the AND circuit 14 is not output, and therefore the traffic jam detection signal with system periodic signal/bang signal sending device is Since the signal controller operates without skipping the second level, it delays the generation of the flashing pedestrian signal Pm in the traffic jam detection direction by that amount, as shown in Figure 3. G time is 2
The time required for the stairs becomes longer, and the system cycle also becomes longer than the congestion cycle.

In this case, the system periodic signal starts at the point indicated by the solid line in FIG. 3 and becomes a traffic jam period.

The operation of the road traffic congestion detection device configured as above will be explained.

FIG. 5 is a time chart when a traffic jam is detected, and FIG. 6 is a time chart when a traffic jam is cleared.

In this embodiment, the up lane Ma of the road M is congested, and the sensor 1
A and 1b are sensing the traffic jam time of vehicle C.

From the NAND circuits 2a and 2b, the sensors 1a and 1
When there is no sensing at counter b, a reset signal is input to the reset terminals of counters 3a and 3b, and the counters 3a and 3
Reset b.

Further, the counters 3a and 3b are constantly supplied with the clock signal CL.
Since the counting clock signal from the counter 3 is inputted, the sensing time of the sensors 1a and 1b is inputted to the counter 1 by the counters 3a and 3b in the check stage CH.

That is, only when the sensors 1a and 1b are detected in the check ladder CH, the NAND circuits 2a and 2b are opened, and the reset of the counters 3a and 3b is canceled to enable time measurement. At that time, the counter starts time measurement by the counting clock signal. start.

If the sensing signals from the sensors 1a and 1b disappear before the time count ends, the reset signal is input again and the time count returns to "0".

Therefore, for example, the setting time of the printers 3a and 3b is 3.
The counting clock signal is set to seconds and starts counting, and when the set value is reached, the flip-flops 5a and 5b are set and the sensing signal is recorded and output as a sensing memory.

Next, if it is assumed that the time when both flip-flops 5a and 5b have sensing memories is when there is a traffic jam, switch J2 is closed to the a side, so both flip-flops 5a and 5b are An up-counter signal is input from the AND circuit 6 to the up-down counter 8 only when an output signal is output.

Furthermore, if there is a sensing memory in either of the flip-flops 5a or 5b and there is a traffic jam, the switch J2 is connected to the b side, so either of the flip-flops 5a or 5b is activated. An up-counter signal is input from the OR circuit 7 to the up-down counter 8 only when one of the output signals is reached.

Therefore, the sensing times set for the counters 3a and 3b are not necessarily the same, but can be selectively set as appropriate depending on the installation locations of the sensors 1a and 1b.

Next, a memory staircase CM is connected to the up-down counter 8, and when the memory staircase signal is input, the up-down counter 8 receives the up-counter signal from the AND circuit 6 or the OR circuit 7, and the number of traffic jams is 1. Then, a reset signal from the reset step R3 is input to the flip-flops 5a and 5b, and the flip-flops 5a and 5b are reset to the initial state, and the number of traffic jams is counted and stored in the up counter once.

Taking this as a - cycle, if the sensing time of the sensors 1a and 1b does not continue until the set time set in the counters 3a and 3b in the next check stage CH, the flip-flops 5a and 5b will not be set. Therefore, since no output signal is output from the AND circuit 6 or the OR circuit 7 to the up/down counter 8, the down counter signal is added to the up/down counter 8, and the number of traffic jams is subtracted once.

However, traffic congestion continues, and sensors 1a and 1b
If the detection continues, the above-mentioned cycle is repeated, and the number of traffic jams on the up-down counter 8 is added up one by one, and the count is counted up to a preset number of times, for example, 3 times as in the embodiment, and the flip-flop 9 is set to detect traffic jams. The signal is stored and output.

When the traffic jam detection signal is output, the subsequent up-counting is applied to the count prohibition input terminals CK and ENA of the up-down counter 8 by the output of the AND circuit 10, and the up-counting is stopped. The system cycle of the traffic signal is controlled so that the green time of vehicle C is extended by adding one flight of stairs during the green time.

As described above, this invention installs a sensor at a typical intersection on a congested road where vehicles do not normally stagnate, but when there is a traffic jam on a specific day and time, vehicles are congested and the vehicle speed slows down. The traffic jam detection ladder detects the time it is sensing,
If the sensing time exceeds a preset time, it is stored, and the sensing memory of the sensor is output as a traffic jam sensing output, and the traffic jam sensing output is checked once per signal cycle. If there is no difference, it is added and counted, and when the number of additions reaches the set number, it is determined that the route is congested, the congestion detection is memorized and a signal is output, and the sensor's time measurement end output is output. If the set number of times reaches "0", it is determined that the route congestion has been resolved, and the memory of the congestion detection is reset and the payment is made, and the above congestion detection is memorized and output. When this occurs, the lock timer is started to keep time, and the traffic jam detection memory signal continues to be output during the set time of the timer, and the lock timer time count end signal and the signal indicating that the set number of times is "0",
This is a road traffic congestion detection device configured to reset the memory of congestion detection and cancel the output.

As described above, the road traffic congestion control device according to the present invention can control traffic signals during congestion by adding it to an existing simple multi-stage system, and can be used on routes that do not require the installation of an automatic sensing system. It can be easily installed at typical intersections that are congested only on specific days and times such as holidays and tourist seasons, and can control traffic congestion cycles.The device is small and the equipment cost is minimal, and it has a significant effect on alleviating traffic congestion. It can be effective.

[Brief explanation of the drawing]

Fig. 1a is a plan view showing road conditions and the installation of sensors to provide an explanation of the present invention; Fig. 1 is a plan view showing the installation of the same simple multi-stage wired traffic signal controller; A circuit diagram of the road traffic congestion detection device according to the present invention, FIGS. 3a and 3b are explanatory diagrams of each signal for one normal signal period and one signal period during congestion, respectively, and FIG. 4 shows the signal period when detecting traffic congestion. The circuit diagram for the extension, FIG. 5 is a time chart when a traffic jam is detected, and FIG. 6 is a time chart 1 when a traffic jam is cleared. la, lb...Sensor, 2a, 2b...AND circuit, 3a, 3b...Counter, 5a, 5b...Flip-flop, 6...AND circuit, 7...OR circuit, 8 ... Up/down counter, 9... Flip-flop timer, 13... Inverter, 14... AND circuit, A... Simple multi-stage wired system main unit, B... Simple multi-stage wired system slave unit, Jl, J2, J3...Switch, C.
...Vehicle, N...Intersection, M, m...Road, P,
Q...vehicle signal, Pm, QM...pedestrian signal, CH...check staircase, CL...clock signal,
CM...Memory ladder, RS...Reset ladder.

Claims (1)

[Claims] 1. A sensor installed at a position where vehicles stall and slow down on the incoming side of a representative intersection on a congested route, a counter that counts the time the sensor detects at the check ladder in one signal cycle, and the above-mentioned sensor. A flip-flop that stores the sensing time if it is greater than or equal to the set time of the counter; a circuit that outputs the sensing memory of the flip-flop as a traffic jam sensing output; and when the traffic jam sensing output is 1, the counter is incremented by one; It is equipped with an up-down counter that subtracts one counter when the output is O, and a flip-flop that determines that there is a congestion on the route when the number of counts of the up-down counter reaches a set number, stores the congestion detection, and outputs it. A road traffic congestion detection device characterized by: