JPH11328579A - Passing vehicle detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the passing vehicle detecting device which is small-sized and usable for a long time by providing a vibration sensor which detects vibration caused by the travel of a vehicle and a magnetic sensor which is driven based on a detected vibration detection signal and detects magnetic raw materials of the vehicle. SOLUTION: When the power source is turned on, the vibration sensor 30 is driven. When the vibration sensor 30 detects vibration larger than a specific level, the magnetic sensor 32, etc., is driven. Then when the magnetic sensor 32 detects magnetism larger than a specific level, a detection status is turned on and a detection signal is sent out through a signal processing part 33 and a radio equipment 34. When the magnetism larger than the specific level is not detected, it is decided again whether or not the vibration sensor 30 still detects the vibration. When the vibration is ceased, the driving of the magnetic sensor 32, etc., is stopped. Thus, the magnetic sensor 32 is not driven until vibration is detected, so the current consumption is reducible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a passing vehicle detecting device which is buried in a ground or the like and detects a case where a vehicle or the like passes over the ground.

FIG. 3 is an explanatory diagram for explaining an outline of a passing vehicle detecting device. In FIG. 3, reference numeral 1 denotes a vehicle, 2 denotes a passing vehicle detection device which is provided buried in, for example, the ground such as a road, and detects when the vehicle 1 passes.
Is a personal computer connected via a personal computer. The personal computer 3 is provided in the management office 5.

FIG. 4 is a block diagram showing a conventional passing vehicle detecting device. The passing vehicle detecting device 2 includes a sensor block 21, a signal processing block 22, and a transmission block 23. The sensor block 21 includes a magnetic sensor 21A and an amplifier 21B that amplifies an output signal of the magnetic sensor 21A. The signal processing block 22 includes an A / D converter 22A that performs A / D conversion on the signal amplified by the amplifier 21B.
And a CPU 22B that takes in a signal converted into a digital signal by the A / D converter 22A and performs signal processing.

The data processed by the CPU 22B is amplified in the transmission block 23 and transmitted to the management office 5 by wire. In the management office 5, the personal computer 3 checks which area the vehicle has entered. In the above configuration, the power of each device is supplied by the cable 4.

[0005]

The above-described conventional passing vehicle detection device has a limited installation range due to the length of the cable 4 and has a small degree of freedom in installation location. Therefore, it has been proposed that the passing vehicle detection device be unitized and the detection signal of the passing vehicle detection device be wirelessly transmitted. In this case, in order to unitize the detection device, the detection device itself must have a power supply necessary for each device, and a configuration including a battery (a secondary battery or the like) is required. However, since the magnetic sensor 21A uses a Hall element or a magneto-resistive element and the like, it is necessary to supply a current at all times, so that the power consumption becomes large when used for a long time. There is a problem that a device having a large capacity is required and the device itself becomes large.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the conventional problem that the degree of freedom of the installation location of a passing vehicle detection device is small, and the size of the device is increased if the degree of freedom of the installation location is increased. It is an object of the present invention to provide a passing vehicle detection device which is small in size, can withstand long-time use, and has a high degree of freedom in installation location.

[0007]

In order to solve the above-mentioned problems, a passing-vehicle detecting device according to the present invention is based on a vibration sensor for detecting vibration caused by running of a vehicle and a vibration detection signal from the vibration sensor. A magnetic sensor that is driven and detects a magnetic material of the vehicle.

When a vehicle passes, vibration occurs due to its weight or the like. Therefore, if this vibration is detected by the vibration sensor, it is possible to detect that the vehicle is approaching without the magnetic sensor always being driven. The current consumption of the vibration sensor is smaller than that of the magnetic sensor. Capacity can be reduced,
The size can be reduced. On the other hand, it is impossible to determine whether or not the vibration source is caused by the vehicle using only the vibration sensor. Therefore, in that case, the magnetic sensor is temporarily driven to detect a metal reaction, thereby confirming whether the vehicle is a vehicle.
Therefore, according to such a configuration, since it is small, can withstand long-time use, and does not use a cable, the degree of freedom of the installation location can be increased.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a passing vehicle detection device according to an embodiment of the present invention. The passing vehicle detection device 2A includes a vibration sensor 30 for detecting vibration.
A determination circuit 31 provided on the output side of the vibration sensor 30 for determining that the vibration is equal to or greater than a predetermined value; and a determination circuit 31 provided on the output side of the determination circuit 31 for detecting a metal object from a change in magnetic flux density. The magnetic sensor 32 and the magnetic sensor 32
A signal processing unit 33 provided on the output side of the
3 is provided on the output side and wirelessly transmits the output of the signal processing unit 33 wirelessly, and includes a battery 40 as a power supply source for them.

The vibration sensor 30 uses, for example, an existing sensor known as an acceleration sensor (which consumes 1
5 mA). The determination circuit 31 determines a case where the vibration signal detected by the vibration sensor 30 is equal to or greater than a predetermined value, and uses the determination signal to determine whether the magnetic sensor 32, the signal processing unit 33,
The wireless device 34 is driven. Therefore, the magnetic sensor 32, the signal processing unit 33, and the wireless device 34 receive power supply from the battery 40 only after receiving the determination signal from the determination circuit 31.

As the magnetic sensor 32, for example, an existing sensor using a Hall element for detecting magnetism by the Hall effect (consumption current is 70 mA) is used. The signal processing unit 33 determines that the vehicle is passing when the detected magnetic signal from the magnetic sensor 32 is equal to or higher than a predetermined level, and performs signal processing so that the detection signal can be transmitted by the wireless device 34. To the device 34. The wireless device 34 transmits the signal to the management office 5 (not shown) to notify that the vehicle is passing.

The operation of the embodiment will be described below with reference to the flowchart shown in FIG. First, when power is turned on in step S1, the vibration sensor is driven in step S2. Then, in step S3, when a vibration having a magnitude equal to or greater than a predetermined level is detected, the process proceeds to step S4, where the magnetic sensor and the like are driven.

When a magnet having a magnitude equal to or larger than a predetermined level is detected in step S5, the detection status is turned on in step S6, and the signal processing unit 3
3. The detection signal is transmitted via the wireless device 34.

On the other hand, if no magnetism having a magnitude equal to or larger than the predetermined level is detected in step S5, the process proceeds to step S7, where it is determined again whether or not there is vibration by the vibration sensor. If there is, the process returns to step S5. On the other hand, if the vibration has disappeared in step S7, the drive of the magnetic sensor and the like is stopped in step S8, and the process returns to step S3.

As described above, in the embodiment of the present invention, the magnetic sensor is not driven until vibration is detected, so that current consumption can be reduced. Compared to the case where the power consumption is reduced, it can be reduced from 700 mAh to 425 mAh in 10 hours of continuous use. This saves about 40 percent. The size of this device can be reduced because a low-capacity battery can be used.
0 × 10 × 25 (5000 cc), which is 20 × 20 × 25 in the case where the magnetic sensor is used alone as in the conventional case.
(10000 cc), so that the volume can be reduced to about half the volume.

[0016]

As described above, the passing-vehicle detecting device according to the present invention is brought into an operating state by detecting a vibration caused by the traveling of the vehicle and detecting the vibration by the vibration sensor. Since the magnetic sensor for detecting the magnetic material of the vehicle is provided, there is an effect that it is small, can withstand long-time use, and can have a large degree of freedom in installation location.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the embodiment of the present invention.

FIG. 3 is a block diagram illustrating an outline of a conventional passing vehicle detection device.

FIG. 4 is a block diagram showing a configuration of a conventional passing vehicle detection device.

[Explanation of symbols]

 2A Passing vehicle detection device 30 Vibration sensor 31 Judgment circuit 32 Magnetic sensor 33 Signal processing unit 34 Radio 40 Battery

Claims (1)

[Claims] 1. A passing vehicle comprising: a vibration sensor that detects vibration generated by running of a vehicle; and a magnetic sensor that is driven based on a vibration detection signal from the vibration sensor and detects a magnetic material of the vehicle. Detection device.