Vehicle detection device and vehicle detection system

Abstract

A vehicle detection device (100) comprises: a magnetic rod (10) having a long axis in a Z direction (predetermined direction); a magnetic sensor board (20) (magnetic sensor); and a communication board (30) that transmits information based on output from the magnetic sensor board (20) to a radio wave receiver (210) (external device) via wireless communication.

Description

Vehicle detection device and vehicle detection system

[0001] The present disclosure relates to a vehicle detection device and a vehicle detection system.

[0002] Japanese Patent Application Laid-Open Publication No. 2019-197379 (Patent Document 1) discloses a vehicle detection device that determines the presence or absence of a vehicle in a parking space based on changes in the detection value of a magnetic sensor installed in the parking space.

[0003] Japanese Patent Application Laid-Open No. 2019-197379

[0004] However, in conventional vehicle detection devices, when another vehicle is parked around the parking space where the magnetic sensor is installed (for example, in an adjacent parking space), the magnetic sensor may detect a magnetic field from the other vehicle. As a result, the magnetic field from the other vehicle may cause an erroneous determination of the presence or absence of a vehicle in the parking space where the magnetic sensor is installed. Therefore, a vehicle detection device and a vehicle detection system that can prevent erroneous determination of the presence or absence of a vehicle in the detection area are desired.

[0005] Therefore, a main object of the present disclosure is to provide a vehicle detection device and a vehicle detection system that can suppress erroneous determination of the presence or absence of a vehicle in a detection target area.

[0006] A vehicle detection device according to a first aspect of the present disclosure is a vehicle detection device that detects vehicles, and includes a magnetic rod having a long axis in a predetermined direction, a magnetic sensor, and a communication board that transmits information based on the output from the magnetic sensor to an external device via wireless communication.

[0007] A vehicle detection system according to a second aspect of the present disclosure includes a vehicle detection device that detects a vehicle and a determination device. The vehicle detection device includes a magnetic rod having a longitudinal axis in a predetermined direction, a magnetic sensor, and a communication board that transmits information based on an output from the magnetic sensor to an external device via wireless communication. The determination device detects a vehicle based on the information transmitted from the communication board to the external device.

[0008] The vehicle detection device and vehicle detection system disclosed herein include a magnetic rod with a long axis in a predetermined direction. Here, a magnetic field has the property of flowing through a long, thin magnetic member along the direction of extension of the magnetic material. By positioning the vehicle detection device so that the magnetic rod faces the detection target area, the magnetic field from vehicles in the detection target area can easily flow along the magnetic rod. As a result, a larger amount of magnetic field from vehicles in the detection target area can be collected compared to magnetic fields from vehicles in other areas. This can reduce erroneous determinations of the presence or absence of a vehicle in the detection target area.

[0009] FIG. 1 is a plan view showing the configuration of a vehicle detection system according to an embodiment; FIG. 2 is a side view showing the arrangement position of a vehicle detection device according to an embodiment; FIG. 3 is a perspective view showing the configuration of a vehicle detection device according to an embodiment; FIG. 4 is a schematic plan view showing the configuration of a vehicle detection device according to an embodiment; FIG. 5 is a diagram showing the operation cycle of a magnetic sensor board and a communication board according to an embodiment; FIG. 6 is a perspective view showing the detection direction of a magnetic field by a magnetic sensor board according to an embodiment; FIG. 7 is a sequence diagram showing control of a vehicle detection system according to an embodiment; FIG. 8 is a plan view showing the configuration of a vehicle detection system according to a modified example of an embodiment;

[0010] 1 is a diagram showing the configuration of a vehicle detection system 300 including a vehicle detection device 100 according to this embodiment. The vehicle detection system 300 includes the vehicle detection device 100, a determination device 200, and a radio wave receiver 210. In this specification, the front-to-rear and left-to-right directions of a vehicle 1 parked in a parking space 2 (described later) are defined as the X direction and the Y direction, respectively, and the vertical direction is defined as the Z direction. The Z direction is an example of a "predetermined direction" in the present disclosure. The radio wave receiver 210 is also an example of an "external device" in the present disclosure.

[0011] The vehicle detection device 100 is disposed, for example, in a parking lot in a parking space 2 where a vehicle 1 is parked. The vehicle detection device 100 is disposed in each of a plurality of parking spaces 2. Each vehicle detection device 100 is used to determine the presence or absence of a vehicle 1 in the parking space 2 in which it is disposed. Note that, for example, the wheel chock 3 is provided on the X2 side of the parking space 2, so the vehicle 1 basically enters the parking space 2 from the X1 side.

[0012] The vehicle detection device 100 communicates wirelessly with a radio wave receiver 210 via a communication board 30 (described later). The determination device 200 determines whether or not a vehicle 1 is present in each parking space 2 based on information received by the radio wave receiver 210. The radio wave receiver 210 and the determination device 200 may be connected either wired or wirelessly.

[0013] As shown in FIG. 2 , the vehicle detection device 100 is buried in the ground of the parking space 2. When the vehicle 1 is stopped by the wheel chock 3, the vehicle detection device 100 is located on the Z2 side (lower side) of the vehicle 1. As a result, the geomagnetic field from above is blocked by the vehicle 1, causing a change in the magnetic field received by the vehicle detection device 100 (magnetic sensor board 20, described below). In addition, the vehicle detection device 100 (magnetic sensor board 20, described below) receives a magnetic field from a motor (not shown) of the vehicle 1 from above. As described above, the vehicle detection system 300 (determination device 200) determines the presence or absence of the vehicle 1 based on the change in the magnetic field received by the vehicle detection device 100 (magnetic sensor board 20), which is caused by the vehicle 1 being parked in the parking space 2.

[0014] FIG. 3 is a perspective view showing the configuration of the vehicle detection device 100. The vehicle detection device 100 includes a magnetic rod 10, a magnetic sensor board 20, a communication board 30, a battery 40, a battery arrangement plate 50, a wall 60, and an antenna 70. The wall 60 shown in FIGS. 3 and 4 is an excerpt of a case (housing) that houses components other than the wall 60 of the vehicle detection device 100. The case actually includes a top plate that covers the components inside the case from the Z1 side, but this is omitted from FIGS. 3 and 4 for simplicity. The magnetic sensor board 20 is an example of a "magnetic sensor" in the present disclosure.

[0015] The magnetic rod 10 has a major axis in the Z direction. That is, the magnetic rod 10 extends in the Z direction. The magnetic rod 10 has a cylindrical shape extending in the Z direction. The magnetic rod 10 has a length L1 in the Z direction. Furthermore, the surfaces of the ends (11, 12) of the magnetic rod 10, which will be described later, have a circular shape with a diameter D1. The length L1 is, for example, four times or more the diameter D1, and the aspect ratio of the magnetic rod 10 is relatively large. This makes it possible to increase the effectiveness of the magnetic rod 10 in collecting the magnetic field in the Z direction. As a result, it becomes possible to detect the vehicle 1 with higher sensitivity.

[0016] The magnetic rod 10 is made of, for example, ferrite. The magnetic rod 10 is arranged on the Z1 side of the vehicle detection device 100. Specifically, the magnetic rod 10 is arranged on the Z1 side of the center of the vehicle detection device 100 in the Z direction. The magnetic rod 10 is arranged on the side of the vehicle detection device 100 that is closer to the vehicle 1 (parking space 2).

[0017] The magnetic rod 10 includes an end 11 and an end 12 in the Z direction. The end 11 is the end on the Z2 side. The end 12 is the end on the Z1 side. The end 11 and the end 12 are examples of the "first end" and the "second end" of the present disclosure, respectively.

[0018] The magnetic rod 10 is fixed to a fixing portion 64 provided on the wall portion 60. The fixing portion 64 is provided so as to protrude from the wall portion 60 (a first wall portion 61 described below) toward the X2 side. The fixing portion 64 is provided with an insertion hole 64a into which the magnetic rod 10 is inserted (fitted). The magnetic rod 10 is fixed with the portion (intermediate portion) between the end portion 11 and the end portion 12 inserted into the insertion hole 64a.

[0019] The magnetic sensor substrate 20 detects the magnetic field around the vehicle detection device 100. The magnetic sensor substrate 20 is provided so as to extend perpendicular to the Z direction. The magnetic sensor substrate 20 is provided so as to face the end 11 of the magnetic rod 10 in the Z direction. Specifically, a sensing portion (not shown) of the magnetic sensor substrate 20 faces the end 11 in the Z direction. This causes the magnetic field flowing from the end 12 to the end 11 of the magnetic rod 10 to be incident on the magnetic sensor substrate 20 (sensing portion). The magnetic sensor substrate 20 and the end 11 of the magnetic rod 10 may be in contact with each other or may be slightly spaced apart.

[0020] The magnetic sensor board 20 is supported from the Z2 side by a sensor arrangement plate 65 provided on the Z2 side (lower side) of the magnetic sensor board 20. The sensor arrangement plate 65 is provided so as to protrude from the wall portion 60 (a first wall portion 61 described below) to the X2 side. The sensor arrangement plate 65 is provided so as to extend perpendicular to the Z direction.

[0021] The communication board 30 transmits the output (detection value) from the magnetic sensor board 20 to the radio wave receiver 210 via wireless communication. By providing the vehicle detection device 100 with the communication board 30 capable of wireless communication, the output of the magnetic sensor board 20 can be easily transmitted to the radio wave receiver 210 even when the vehicle detection device 100 (magnetic sensor board 20) and the radio wave receiver 210 are separated from each other (for example, when the vehicle detection device 100 is buried underground).

[0022] The communication board 30 is provided separately from the magnetic sensor board 20. The communication board 30 is disposed at a distance in the Z direction from each of the magnetic rod 10 and the magnetic sensor board 20. In other words, the communication board 30 is disposed at a position farther from the parking space 2 (vehicle 1) than each of the magnetic rod 10 and the magnetic sensor board 20.

[0023] By arranging the magnetic sensor board 20 in a position relatively close to the vehicle 1, the magnetic field from the vehicle 1 can be more accurately detected by the magnetic sensor board 20. Furthermore, by arranging the magnetic rod 10 in a position away from the communication board 30, it is possible to prevent the adverse effects of the antenna effect of the magnetic rod 10 from reaching the communication board 30.

[0024] As shown in Fig. 4, the communication board 30 is disposed in an area away from the area overlapping with the magnetic sensor board 20 (magnetic rod 10) when viewed along the Z direction. This prevents the magnetic field from being incident on the communication board 30 even if the magnetic field from the magnetic rod 10 flows toward the Z2 side without being incident on the magnetic sensor board 20. Note that Fig. 4 shows the layout relationship between the communication board 30 and the magnetic sensor board 20, and therefore some unrelated components are omitted from the illustration for simplification.

[0025] Referring again to FIG. 3 , the vehicle detection device 100 is provided with four batteries 40. Note that the number of batteries 40 is not limited to four. Each of the four batteries 40 is a power source for supplying power to each of the magnetic sensor board 20 and the communication board 30. In the following description, when simply referring to a battery 40, the content is common to each of the four batteries 40. Note that the four batteries 40 are arranged side by side in the X direction.

[0026] Providing the battery 40 in the vehicle detection device 100 eliminates the need to connect the vehicle detection device 100 to an external power source with a cable. As a result, the vehicle detection device 100 can be easily installed in a location that is difficult to install (where it is difficult to lay a cable), such as underground.

[0027] The battery 40 is disposed on the opposite side of the magnetic sensor substrate 20 from the magnetic rod 10. The magnetic rod 10 is disposed on the Z1 side end of the vehicle detection device 100, while the battery 40 is disposed on the Z2 side end of the vehicle detection device 100. This prevents the magnetic field from the magnetic rod 10 from being incident on the battery 40. The battery 40 contains an iron-based material, so it absorbs the surrounding magnetic field and generates its own magnetic field when magnetized. Therefore, disposing the magnetic rod 10 relatively far from the battery 40 can effectively prevent the battery 40 from absorbing the magnetic field and magnetizing the battery 40.

[0028] The distance D (shortest distance) in the Z direction between the battery 40 and the magnetic sensor substrate 20 is greater than the length L1 in the Z direction of the magnetic rod 10. This makes it possible to suppress the influence of the magnetic field from the battery 40 on the magnetic sensor substrate 20 compared to when the distance D is equal to or less than the length L1.

[0029] The battery 40 has a cylindrical shape. The central axis α of the battery 40 extends in the Y direction. The length L2 of the battery 40 in the Y direction is greater than the diameter D2 of the end face of the battery 40 in the Y direction. Therefore, the distance D between the battery 40 and the magnetic sensor substrate 20 can be made smaller than when the central axis α extends in the Z direction. As a result, the magnetic field from the battery 40 can be more effectively prevented from affecting the magnetic sensor substrate 20. Note that the battery 40 may be a rectangular battery and also have a rectangular parallelepiped shape.

[0030] Four batteries 40 are arranged on the battery arrangement plate 50. The battery arrangement plate 50 is provided so as to extend perpendicular to the Z direction. The battery arrangement plate 50 supports the four batteries 40 from the Z2 side. The battery arrangement plate 50 is provided at the end of the vehicle detection device 100 on the Z2 side. The battery arrangement plate 50 is formed, for example, from resin.

[0031] The wall portion 60 is provided to extend from the outer peripheral edge 51 of the battery arrangement plate 50 toward the magnetic sensor board 20 (Z1 side). The wall portion 60 is made of a non-magnetic material, such as resin (plastic).

[0032] The wall portion 60 includes a first wall portion 61, a second wall portion 62, and a third wall portion 63. The first wall portion 61 is connected to each of the second wall portion 62 and the third wall portion 63.

[0033] The first wall portion 61 is provided to extend perpendicular to the X direction. The first wall portion 61 is connected to the X1-side end portion 52 (see FIG. 4 ) of the battery arrangement plate 50. The magnetic rod 10 is fixed to the first wall portion 61 and is therefore disposed near the X1-side end portion of the vehicle detection device 100. Here, as described above, the vehicle 1 enters the parking space 2 from the X1 side. Therefore, when the vehicle 1 is parked, it is possible to prevent the magnetic field from the vehicle 1 from being incident on the battery 40, etc. before being collected by the magnetic rod 10.

[0034] The second wall 62 and the third wall 63 are each provided to extend perpendicular to the Y direction. The second wall 62 is connected to an end 61 a of the first wall 61 on the Y1 side. The third wall 63 is connected to an end 61 b ​​of the first wall 61 on the Y2 side.

[0035] The antenna 70 is an antenna used for wireless communication by the communication board 30. This allows the radio waves from the communication board 30 to travel a longer distance. As a result, it is possible to increase the number of communication boards 30 (vehicle detection devices 100) with which one radio wave receiver 210 can communicate.

[0036] The antenna 70 is disposed on the second wall portion 62. Specifically, the antenna 70 extends in the Z direction along the second wall portion 62 extending in the Z direction. By disposing the antenna 70 on the second wall portion 62, the distance between the antenna 70 and the magnetic rod 10 can be made longer than when the antenna 70 is disposed on the first wall portion 61. As a result, it is possible to prevent the magnetic field from the magnetic rod 10 from adversely affecting the antenna 70. The antenna 70 may also be provided on the third wall portion 63.

[0037] As shown in FIG. 5 , the communication board 30 and the magnetic sensor board 20 each operate intermittently. Specifically, the communication board 30 and the magnetic sensor board 20 each operate every t seconds (e.g., 30 seconds). This reduces power consumption compared to when the communication board 30 and the magnetic sensor board 20 each operate constantly. As a result, the rate at which the stored power of the battery 40 is consumed can be reduced. This reduces the frequency at which battery replacement is required, making it possible to easily install the vehicle detection device 100 underground or in other locations where battery replacement is difficult.

[0038] 5 shows an example in which the communication board 30 and the magnetic sensor board 20 are synchronized with each other, but the present disclosure is not limited to this. The communication board 30 and the magnetic sensor board 20 may be asynchronous. Furthermore, the operation cycles of the communication board 30 and the magnetic sensor board 20 may be different from each other. When the operation cycles of the communication board 30 and the magnetic sensor board 20 are asynchronous, it is possible to prevent noise caused by the operation of the communication board 30 from being detected by the magnetic sensor board 20.

[0039] 6, the magnetic sensor substrate 20 is a triaxial magnetic sensor that detects magnetic fields in three mutually orthogonal directions. Specifically, the magnetic sensor substrate 20 is disposed so as to detect each of a magnetic field Mx in the X direction, a magnetic field My in the Y direction, and a magnetic field Mz in the Z direction.

[0040] The determination device 200 acquires the detection values ​​(outputs) of the magnetic fields Mx, My, and Mz detected by the magnetic sensor board 20 through the radio wave receiver 210 and the communication board 30. Here, the determination device 200 weights the magnetic field Mz more than the magnetic fields Mx and My to determine the presence or absence of the vehicle 1.

[0041] The determination device 200 calculates absolute values ​​ΔMx, ΔMy, and ΔMz of the differences from the magnetic field at the previous detection timing, and determines whether each of ΔMx, ΔMy, and ΔMz is equal to or greater than a threshold. The determination device 200 basically determines that there has been a change in the presence or absence of the vehicle 1 when two or more positive values ​​(Δ is equal to or greater than the threshold) are found. However, if the z component is positive, the determination device 200 determines that there has been a change in the presence or absence of the vehicle 1 even if the x component and the y component are incorrect (Δ is less than the threshold). Specifically, if (ΔMx, ΔMy, ΔMz) are (incorrect, incorrect, incorrect), (incorrect, correct, incorrect), or (correct, incorrect, incorrect), it is determined that there has been no change in the presence or absence of the vehicle 1. Furthermore, if (ΔMx, ΔMy, ΔMz) are (incorrect, incorrect, correct), (incorrect, correct, correct), (correct, incorrect, correct), (correct, correct, incorrect), or (correct, correct, correct), it is determined that there has been a change in the presence or absence of the vehicle 1. That is, if the X or Y component is positive, 1 is added, and if the Z component is positive, 2 is added. If the total value is 2 or more, it is determined that there is a change in the presence or absence of the vehicle 1.

[0042] <Sequence Control of Vehicle Detection System> Next, a sequence related to control for detecting the presence or absence of a vehicle 1 by the vehicle detection system 300 will be described with reference to Fig. 7. Note that the sequence shown in Fig. 7 is executed, for example, every period (30 seconds) during which each of the communication board 30 and the magnetic sensor board 20 operates intermittently.

[0043] In step S1 , the vehicle detection device 100 detects a magnetic field using the magnetic sensor board 20 .

[0044] In step S2, the vehicle detection device 100 transmits the output of the magnetic fields (magnetic field Mx, magnetic field My, and magnetic field Mz) detected in step S1 to the radio wave receiver 210 via the communication board 30.

[0045] In step S3, the determination device 200 acquires the outputs (magnetic fields Mx, My, and Mz) of the magnetic sensor board 20 transmitted from the communication board 30 to the radio wave receiver 210 in step S2.

[0046] In step S4, the determination device 200 calculates the absolute values ​​ΔMx, ΔMy, and ΔMz of the amount of change from the magnetic field at the previous detection timing, and determines whether each of ΔMx, ΔMy, and ΔMz is equal to or greater than a threshold value.

[0047] In step S5, the determination device 200 determines whether two or more of ΔMx, ΔMy, and ΔMz calculated in step S4 are positive (the absolute value of the amount of change is equal to or greater than a threshold value), or whether ΔMz is positive. If the determination in step S5 is Yes, the process proceeds to step S6. If the determination in step S5 is No, the process ends. Note that if ΔMz is positive, the determination in step S5 is Yes, regardless of whether ΔMx and ΔMy are correct.

[0048] In step S6, the determination device 200 determines that there has been a change in the presence or absence of the vehicle 1 in the parking space 2. For example, if the amount of change in step S5 is a positive value, it may be determined that the vehicle 1 has entered the parking space 2, and if the amount of change is a negative value, it may be determined that the vehicle 1 has exited the parking space 2. Note that the threshold value may be changed depending on the vehicle type.

[0049] Although the above embodiment illustrates an example in which the vehicle detection device 100 is buried underground, the present disclosure is not limited thereto. The vehicle detection device may be disposed above ground. For example, as shown in FIG. 8 , the vehicle detection device 100 may be disposed in a side area of ​​a road 4 on which the vehicle 1 travels. In this case, the magnetic rod 10 is provided to extend in a direction (Y direction) perpendicular to the direction in which the vehicle 1 travels (the direction in which the road 4 extends) (X direction in FIG. 8 ). The vehicle detection device 100 is also installed so that the magnetic rod 10 is close to the road 4 (Y1 side). The vehicle detection device 100 may be disposed above ground of the road 4 or buried underground of the road 4. The vehicle 1 may be not only an automobile but also a railway vehicle.

[0050] In addition, in the above embodiment, an example has been shown in which the vehicle detection device 100 is buried in the ground of the parking space 2, but the present disclosure is not limited to this. For example, the vehicle detection device 100 may be installed on the ground, wall, or ceiling of the parking lot.

[0051] In addition, in the above embodiment, an example was shown in which the vehicle detection device 100 is equipped with a battery 40, but the present disclosure is not limited to this. The vehicle detection device may not be equipped with a battery and may be supplied with power from a power source via a cable. In this case, each of the communication board 30 and the magnetic sensor board 20 may operate continuously rather than intermittently.

[0052] In the above embodiment, the magnetic sensor substrate 20 includes a three-axis magnetic sensor, but the present disclosure is not limited to this. The magnetic sensor substrate may be capable of detecting a magnetic field in only one direction (for example, the Z direction).

[0053] In the above embodiment, the radio wave receiver 210 that receives information from the communication board 30 and the determination device 200 are provided separately, but the present disclosure is not limited to this. For example, the determination device may receive the information.

[0054] In the above embodiment, the magnetic sensor board 20 and the communication board 30 are provided separately, but the present disclosure is not limited to this. The magnetic sensor board 20 may be formed integrally with the communication board 30.

[0055] In the above embodiment, an example has been shown in which the determination device 200 is provided separately from the vehicle detection device 100, but the present disclosure is not limited to this. The vehicle detection device may determine whether or not the vehicle 1 is present.

[0056] The configuration of the vehicle detection device 100 shown in the above embodiment is merely an example, and the configuration of the vehicle detection device is not limited to the above example.

[0057] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The present disclosure is defined by the scope of the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims.

[0058] 10 Magnetic rod, 11 End (first end), 12 End (second end), 20 Magnetic sensor board (magnetic sensor), 30 Communication board, 40 Battery, 50 Battery arrangement plate, 51 Outer periphery, 61 First wall portion, 62 Second wall portion, 70 Antenna, 100 Vehicle detection device, 200 Determination device, 210 Radio wave receiver (external device), 300 Vehicle detection system, Z Direction (predetermined direction), α Central axis.

Claims

1. A vehicle detection device for detecting a vehicle in a detection target area, comprising: A magnetic body rod having a major axis extending toward the detection target area; A magnetic sensor; A communication board that transmits information based on the output from the magnetic sensor to an external device by wireless communication.

2. The magnetic body rod includes a first end portion and a second end portion in the axial direction in which the major axis extends; The magnetic sensor is provided so as to face the first end portion of the magnetic body rod in the axial direction; The communication board is arranged in a region separated from a region overlapping the magnetic sensor when viewed along the axial direction. The vehicle detection device according to claim 1.

3. The communication board is arranged at an interval from the magnetic body rod and the magnetic sensor in the axial direction. The vehicle detection device according to claim 2.

4. Further comprising a battery for supplying power to each of the magnetic sensor and the communication board; The battery is arranged on the side opposite to the magnetic body rod with respect to the magnetic sensor. The vehicle detection device according to claim 2 or claim 3.

5. The battery has a cylindrical shape or a rectangular parallelepiped shape; The vehicle detection device according to claim 4, wherein the central axis of the battery is arranged so as to intersect the axial direction.

6. A battery placement board on which the battery is arranged; A first non-magnetic wall portion extending from the outer peripheral edge of the battery placement board toward the magnetic sensor side. The magnetic body rod is fixed to the first wall portion. The vehicle detection device according to claim 4.

7. An antenna for communication by the communication board; A second non-magnetic wall portion extending from the battery placement board toward the magnetic sensor side. The second wall portion is connected to the first wall portion; The antenna is arranged on the second wall portion. The vehicle detection device according to claim 6.

8. The magnetic sensor is a three-axis magnetic sensor that detects magnetic fields in three mutually perpendicular directions. The vehicle detection device according to any one of claims 1 to 3.

9. At least one of the communication board and the magnetic sensor operates intermittently. The vehicle detection device according to any one of claims 1 to 3.

10. A vehicle detection device for detecting a vehicle in a detection target area, and A determination device. The vehicle detection device includes: A magnetic body rod having a major axis extending toward the detection target area; A magnetic sensor; A communication board that transmits information based on the output from the magnetic sensor to an external device by wireless communication, The determination device is a vehicle detection system that detects the vehicle based on the information transmitted from the communication board to the external device. **Claim 11** The magnetic sensor is a three-axis magnetic sensor that detects magnetic fields in three directions orthogonal to each other, and detects a magnetic field in at least the axial direction in which the major axis extends. The determination device weights the output corresponding to the axial direction more than the outputs corresponding to the other two directions among the outputs from the three-axis magnetic sensor, and detects the vehicle. The vehicle detection system according to claim 10.