JPH022495A - Parking/stopping vehicle sensor - Google Patents

Abstract

PURPOSE:To always monitor a vehicle parking/stopping for a long time by individually counting up output periods from plural vehicle sensors arranged at an interval less than an average vehicle length along a parking/stopping vehicle monitor area on a road and comparing the counted value with a previous ly set threshold. CONSTITUTION:Plural vehicle sensors 2 are arranged at the interval less than the average vehicle length along the parking/stopping vehicle monitor area on the road side of a traffic signal machine 1. Outputs from respective sensors 2 are inputted to a receiving part 8 through a signal cable 6. A signal selection switching part 10 successively switches the outputs of the receiving part 8 to decide the existence of a vehicle. When the existence of a vehicle is decided, the output periods of respective vehicle sensor signals are individually integrated by timers T1 to Tn in a counting means 14. At the time of counting a time longer than a previously set threshold, a deciding means 16 outputs a long parking signal Ei and alarms its driver by an alarm plate 3 corresponding to the sensor 2. Thus, long parking/stopping can always be automatically monitored.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application of the Invention The present invention relates to a parked vehicle sensing device that detects a vehicle on the road and determines whether it is a passing vehicle or a long-term parked vehicle.

<Prior art and its problems> In general, illegal parking near intersections directly causes traffic congestion, so it is necessary to take measures such as issuing warnings and crackdowns on such illegal parking. Therefore,
Traditionally, roadside signs have been placed prohibiting parking, and police officers have been enforcing parking regulations. However, even if regulatory signs are installed, some drivers ignore them, and even when police officers carry out enforcement, it is difficult to carry out enforcement at all times due to manpower and time constraints, so it is difficult to eliminate traffic congestion. In many cases, it is not possible to achieve sufficient effectiveness.

By the way, various types of vehicle detectors such as a loop coil type and an ultrasonic type have been conventionally used as devices for detecting the presence or absence of a vehicle on the road. Therefore, such vehicle detectors are installed, for example, near intersections to detect the presence or absence of vehicles, and if a vehicle is illegally parked, it immediately issues a warning to the driver. A possible solution is to eliminate illegally parked vehicles.

However, for example, near intersections, there are not only illegally parked vehicles but also vehicles that are temporarily stopped waiting for traffic lights, so simply installing a vehicle detector is not enough to distinguish between passing vehicles and illegally parked vehicles. cannot be done reliably.

<Purpose of the Invention> The present invention has been made in view of the above circumstances, and has an object to detect vehicles on the road and effectively and reliably determine whether they are simply passing vehicles or long-term parked vehicles. The purpose is to

<Configuration and Effects of the Invention> In order to achieve the above object, the present invention adopts the following configuration.

That is, the parked vehicle sensing device of the present invention includes a plurality of vehicle sensing sensors arranged in tandem at intervals equal to or less than the average vehicle length along the boundary line of a parking monitoring area set on a road, and each vehicle sensing sensor. A counting means for individually counting the output period of the detection signal of a parked vehicle from the sensor, and each count output from this counting means is compared with a preset threshold value, and each count value exceeds the threshold value. and a discriminating means that outputs a long-term parking discriminating signal when the vehicle exceeds the parking limit. According to the above configuration, for example, when a vehicle is present in the parking/parking monitoring area, this is detected by the vehicle detection sensor, and a vehicle detection signal is output from the sensor.

The output of this vehicle sensing signal is counted by a counting means. If the count value exceeds the threshold value, the determining means regards the vehicle as not just a passing vehicle but a long-term parked vehicle and outputs a long-term parked/stopped discrimination signal.

Therefore, based on this long-term parking/stopping determination signal, it is possible to take measures such as issuing a warning to a driver who is illegally parking or taking a photograph of the license plate. Moreover, crackdowns and warnings on illegally parked vehicles can be carried out at any time of the day, which previously relied only on human hands and regulatory signs. Therefore, it becomes possible to effectively eliminate traffic congestion. In addition, if the threshold value set in advance in the discrimination means has a certain correlation with the signal switching cycle of traffic signals, it would be possible to prevent illegal parking and parking near intersections with vehicles temporarily stopped for waiting at traffic lights. It becomes possible to reliably sort out illegally parked vehicles and issue warnings, etc. to illegally parked vehicles.

<Embodiment> FIG. 1 is a perspective view showing an example of a case where the parked vehicle sensing device of the present invention is installed at an intersection. In the figure, l is a traffic signal, 2 is a vehicle detection sensor, 3 is a warning board, and 4 is a vehicle. The vehicle detection sensors 2 described above are arranged in tandem at intervals equal to or less than the average vehicle length along the roadside of a parking/stop monitoring area set on the road, and each vehicle detection sensor 2 is connected by a signal cable 6. There is. Although the vehicle detection sensor 2 is of an electromagnetic induction type in this example, other types such as a loop coil type or an ultrasonic type can also be applied.

FIG. 2 is a configuration diagram of the main body of the sensing device that performs data processing based on vehicle sensing signals output from each vehicle sensing sensor 2. As shown in FIG.

In the figure, reference numeral 8 denotes a receiving section that manually inputs vehicle sensing signals output from each vehicle sensing sensor 2 via a signal cable 6, and lO denotes a signal selection switching section that selects each vehicle sensing signal output from the receiving section 8. , 12 is a vehicle presence/absence determination unit that determines the presence or absence of a vehicle based on the signal level of the vehicle sensing signal output from the signal selection switching unit 10. Also, 14 is a vehicle presence/absence determination section! 2 is a counting means that is activated when it is determined that there is a parked vehicle and counts the output time of the vehicle detection signal individually, and in this example, the counting means is provided corresponding to each vehicle detection sensor 2 individually. It is composed of timers T1 to Tn. 16 is each timer T of the counting means 14, ~
The Tn output is compared with a preset threshold value t4&, and the count value of each timer T1 to Tn is equal to the threshold value t'q.
% is exceeded, the long-term parking/stopping discrimination signal Ei is output.

In this example, the threshold value ttk is set, for example, to=-ts (k is a coefficient of 1 or more) so as to correlate with the signal switching period ts of the traffic signal I. Reference numeral 18 denotes a warning board control unit that outputs a warning signal to the warning board 2 corresponding to the vehicle sensor 2 that has detected the parked vehicle in response to the long-term parking/parking discrimination signal output from the determining means 16.

FIG. 3 is a perspective view of the warning plate 3. This warning board 3 includes a warning light 20 and a warning display board 2 to call attention to the driver.
2 and a speaker 24 for issuing a warning.

Next, regarding the operation of the parked vehicle sensing device having the above configuration,
This will be explained with reference to the time chart shown in FIG. 4 and the flow chart shown in FIG.

The signal selection switching section 10 of the main body of the sensing device is sequentially given number data from 1=1-n assigned to each vehicle sensing sensor 2 individually. Thereby, the signal selection switching unit IO sequentially selects the vehicle sensing signals from each vehicle sensing sensor 2 in numerical order from i=l to n. Therefore, initially, the vehicle detection signal from the vehicle detection sensor 2 with number i=1 is selected (step 2). Then, the selected one vehicle sensing signal is transmitted to the vehicle presence/absence determining unit 1 of the next stage.
2. The vehicle presence/absence determination section 12 determines the presence/absence of a vehicle based on the signal level of this vehicle sensing signal (step (2)). If the vehicle does not exist in the parking/stop monitoring area, the vehicle presence/absence determining section 12 outputs a timer reset signal to the next stage counting means 14. As a result, the timer Ti corresponding to the vehicle detection sensor 2 is reset (step
).

When the vehicle presence/absence determination unit 12 determines that the vehicle is present in the parking/parking monitoring area, the next stage counting means 1
A timer increment signal should be output to 4. Therefore, the timer Ti corresponding to the vehicle detection sensor 12 is incremented (step 2). Then, the count value t of the timer Ti is compared with a preset threshold value tth by the discriminating means I6 at the next stage (step 2). If the count value t4 is less than or equal to the threshold value tt)1, there is no output from the determining means 16, and the signal selection switching section 10 selects the vehicle sensing signal from the next vehicle sensing sensor 2 (step 2). In step ■, the count value t of timer TI
If λ exceeds the threshold tS, the determining means 16
The vehicle existing in the parking/parking monitoring area is regarded as a long-term parked vehicle, not just a passing vehicle, and the long-term parking/parking discrimination signal Ei is issued.
Output (step ■). When the warning board control section 18 receives the long-term parking/parking discrimination signal Ei from the discriminating means 16,
In response to this, a warning signal is output to the warning board 2 near the vehicle detection sensor 2 that has detected the long-term parked vehicle.

Based on this warning signal, the warning board 2 lights up a warning light 20 and displays warning characters on a warning display board 22,
Furthermore, on speaker 24, for example, "Parking or stopping is prohibited in this area. Illegal vehicles will be immediately towed away."
etc., to alert drivers who have been parked for long periods of time.

When all the vehicle sensors 2 up to 1=l-n have been selected ('step ■), the process returns to step ■, and the operations from step ■ to step ■ are repeated again.

In this way, even if a vehicle is detected by the vehicle detection sensor 2, if the parking time of the vehicle is short, the vehicle detection sensor 2
The count value tL of each timer Ti corresponding to
1 or less, the timer Ti is reset. On the other hand, if the parking time is long and exceeds the threshold value t1k, a long-term parking discrimination signal Ei is output to the driver who is illegally parked. A warning will be issued.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention. Fig. 1 is a perspective view showing an example of a parked vehicle sensing device installed at an intersection, and Fig. 2 is a perspective view showing an example of a parking vehicle sensing device installed at an intersection. A configuration diagram of the main body of the sensing device that performs data processing based on the
FIG. 3 is a perspective view of the warning board, FIG. 4 is a time chart of the vehicle detection signal and long-term parking/stop determination signal, and FIG. 5 is a flow chart for explaining the operation. 2...Vehicle detection sensor, 3...Warning plate, 14...Counting means, l6...Discrimination means.

Claims (2)

[Claims] (1) A plurality of vehicle detection sensors arranged in tandem at intervals equal to or less than the average vehicle length along the boundaries of the parking and parking monitoring area set on the road, and detection signals of parked and parked vehicles from each vehicle detection sensor. a counting means for individually counting the output periods of each; and comparing each count output from this counting means with a preset threshold, and when each count value exceeds the threshold, generates a long-term parking/stopping determination signal. A parking and parked vehicle sensing device characterized by comprising: a determination means for outputting the following: (2) A warning board installed near the parking/parking monitoring area is provided, and a warning control unit is provided for outputting a warning signal to the warning board in response to a long-term parking/parking determination signal output from the determining means. The parked vehicle sensing device according to claim 1, characterized in that: