JPH0329096A - Traffic signal controller - Google Patents

Abstract

PURPOSE:To secure the safety of crossing pedestrians and vehicles by comparing counted values of a pedestrian detection signal and a vehicle detection signal with reference counted values in each time zone and controlling the signal indication to the safety side at the time of discriminating the abnormal state. CONSTITUTION:A CPU 1 detects a vehicle or a pedestrian to count up the number of detected vehicles or that of pedestrians and stores them in each time zone and compares these counted values with reference counted values to discriminate whether the operation state of a pedestrian push button 4 and a vehicle sensor 5 is normal or not. The CPU 1 compares the value counted from the start time of each set time zone with the reference counted value preset for this time zone at the time of the end of this set time zone, and the CPU 1 judges that the vehicle sensor 5 is abnormal in case of (the counted value)<(reference counted value) but resets the sensor abnormality in case of (counted value)>=(reference counted value) to forcibly switch the signal to the safety side till release. Thus, the safety of crossing pedestrians and vehicles is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a traffic signal control device for safely and smoothly controlling traffic flow. In particular, it is a push-button type traffic signal control device that keeps the main road side green at all times. This paper relates to safety in signal control that changes signal display based on requests from pedestrians or vehicles.

Conventional technology Conventionally, from the standpoint of safety, this type of traffic signal control device has determined whether there is an abnormality in the pedestrian pushbutton or vehicle sensor. The operating state of the driver pushbutton and vehicle sensor is determined, and if an abnormal state is determined, a signal is displayed to the safe side for control.

Problems to be Solved by the Invention However, with the conventional traffic signal control device described above, failures due to disconnection or poor contact between the pedestrian pushbutton and the vehicle sensor can be detected by abnormality determination based on continuous sensing over a long period of time; Since failures due to poor sensing cannot be detected, the signal display may not change even if requested by a pedestrian or vehicle, which poses a safety problem. The present invention solves these conventional problems, including problems caused by disconnection or poor contact between the pedestrian pushbutton and the vehicle detector.
Excellent traffic signal control that can detect failures such as shortening or poor sensing, thoroughly determines the operating status of pedestrian pushbuttons and vehicle detectors, and controls by displaying the signal on the safe side if it is determined to be an abnormal condition. The purpose is to provide a device.

:! In order to achieve the above object, the present invention provides a clock, a means for individually counting pedestrian detection signals and vehicle detection signals, and counting values of pedestrian detection signals and vehicle detection signals for one day. It has a means for storing reference count values for each time period and a reference count value for each time period for pedestrians and vehicles. In such cases, a signal can be displayed on the safe side for control.

Operation The present invention uses the above-described configuration to compare the count values of the pedestrian detection signal and vehicle detection signal with the reference count value for each time period, thereby preventing disconnection or poor contact between the pedestrian pushbutton and the vehicle sensor. It is possible to detect not only failures due to short circuits and failures due to poor sensing, but also to determine whether there is any abnormal operation of the pedestrian pushbutton or vehicle sensor, and if an abnormality is determined, the signal display can be changed to a safer side. can be released and controlled.

Embodiment FIG. 1 shows the structure of an embodiment of the present invention. Also shown in Figure 1, l is a microcomputer (hereinafter referred to as CP).
(referred to as U). A pedestrian pushbutton and a vehicle detector are connected to the CPU boat 2 and boat 3, respectively, so that control can be performed according to the sensing situation. 2
is a signal control unit, which is connected to the CPU boat 4. The trunk side light device 6 and the intersection side light devices 7 and 8 are sequentially blinked and controlled. 3 is a special feature that can keep time even during a power outage, and the CP
It is connected to U's boat L, allowing control appropriate to the time of day.

Next, the operation of the above embodiment will be explained with reference to the flowchart shown in FIG.

Figure 3 shows an overview of the operation of the push-button traffic light. Push-button traffic lights always keep the main road side green (@Chimuji)
A method for efficient signal control by minimizing the number of blue displays on intersecting roads with low traffic volume by switching the signal display based on the detection of a request from a pedestrian or vehicle (when a request is detected). It is.

First, the CPU counts up the number of vehicles detected and the number of pedestrians detected as detected when each of vehicle detection and pedestrian detection changes from detected to non-sensed, and stores them separately for each time period (step 1, 2, 3.4). Therefore, if there is a continuous sensing state due to a failure such as a disconnection or poor contact, the count will be zero. The CPU compares this counted value with the preset reference count value to determine whether the operating states of the pedestrian push button and the vehicle sensor are normal or abnormal.

The status of the sensor or abnormality can be determined by the appropriate or inappropriate number of detections.

When the end time of each fixed time period of the reference count value is reached, the CPU compares the sensed count value from the start of the corresponding time period with the set reference count value of the corresponding time period. (Step 6) If the sensing count value <the reference count value, it is determined that the vehicle sensor is abnormal and a vehicle sensing abnormality is set (Steps 6 and 8). If the sensing count value is greater than or equal to the reference count value, the CPU resets the sensor abnormality regardless of whether the sensor was normal or abnormal up to that point. When the sensor abnormality is set, the CPU performs signal control by forcibly switching the signal display to the detection state (safe side) until the sensor abnormality is set (step 10.1+.
). In the case of a continuous sensing state, the display switches to a sensing state, so it is on the safe side regardless of whether the sensor is normal or abnormal.

Whether the operation of the vehicle sensor is normal or abnormal is determined at each end time of the set time period. If the sensor is determined to be abnormal, the display will indicate a false alarm, but even if the sensor is determined to be abnormal, the CPU will continue to count the number of detected vehicles and will proceed to the next setting. If the sensor is determined to be normal at the end of the time period, the sensor abnormality is reset (step 6.7.9).
Perform signal control according to vehicle requests <Step 10.1
2).

Abnormality is determined in the same way for the walking sound detection signal, and (
Step 7.8) If there is an abnormality in either the vehicle detector or the pedestrian pushbutton, the display is forcibly switched to indicate a false alarm.

Even if the sensor remains abnormal for a long time, the signal display will switch to safety, and blue will be displayed sequentially on both the main line and the intersection side, so there is no safety problem, but the sensor will become normal at the end of the set time period. - By determining the abnormality, it is possible to reset the abnormality, enabling more efficient signal control.

The standard count value is a value used to determine whether the pedestrian pushbutton and vehicle detector are operating normally, so it should be determined in advance based on the traffic situation at the installation location that is appropriate for the traffic volume for each time period. A value needs to be set. In some cases, the count may be zero for both vehicles and pedestrians during late night hours, so it is necessary to select an appropriate reference force value depending on the installation location.

In this way, according to the above embodiment, by comparing the count values of the pedestrian detection signal and vehicle detection signal with the reference count value for each time period, abnormal operation states of the pedestrian pushbutton and the vehicle sensor can be detected. It is possible to make judgments without exception and to perform safer signal control.

Effects of the Invention As is clear from the above embodiments, the present invention determines the operating states of the pedestrian pushbutton and the vehicle sensor without exception, and when it is determined that an abnormal state is present, the control is performed by displaying a signal on the safe side,
Push-button signal control has the effect of ensuring the safety of pedestrians and vehicles crossing the road.

[Brief explanation of 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 graph chart for explaining the control sequence, and Figs. 3 a and b are intersection layouts for explaining push-button signal control. Figure and signal diagram. 1...Microcomputer, 2...Signal control unit, 3...
・Clock, 4...Pedestrian push button, 5...
・・iR both sensors, 6・・・・Main side light device (for cars)
, 7... Intersection side light device (for pedestrians), 8...
・Cross side light equipment (for cars).

Claims (1)

[Claims] A clock that can operate even during a power outage, means for individually counting pedestrian detection signals from a pedestrian pushbutton and vehicle detection signals from a vehicle sensor, and counting values of the pedestrian detection signals and vehicle detection signals for one day. means for presetting and storing reference count values for pedestrians and vehicles for each time period, and count values for pedestrian detection signals and vehicle detection signals and the reference counts for each time period. A means for comparing the values, and an operating state of the pedestrian pushbutton and the vehicle sensor are determined based on the results of the comparing means, and when it is determined that an abnormal state is present, a signal is displayed to the safe side. 1. A traffic signal control device comprising: means for controlling.