Door opening / closing detection system

Abstract

To detect opening / closing of a door of a truck without needing battery replacement.SOLUTION: In a door opening / closing detection system 1, a magnet 30 is installed at a right rear door 12R provided at a van body 11 of a truck 10. A first beacon device 20A is installed at a rear door frame 16 provided at the van body 11 and has a beacon transmission part 23A which is driven by an electric current generated by electromagnetic induction occurring between the magnet 30 and a coil 21A to transmit a first beacon. A second beacon device 20B is installed at a side panel 15 provided at the van body 11 and has a beacon transmission part 23B which is driven by an electric current generated by electromagnetic induction occurring between the magnet 30 and a coil 21B and transmits a second beacon. An opening / closing detection device 50 detects opening / closing of the right rear door 12R on the basis of a reception order of the first beacon and the second beacon.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a door opening / closing detection system.

Background Art

[0002] There is a technique for detecting the opening and closing of a truck door using a magnetic sensor. In this technique, the opening and closing of the door is detected according to the distance between a magnetic sensor installed on the door frame and a magnet installed on the door.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, since a magnetic sensor operates using a button battery, in order to detect the opening and closing of a truck door using a magnetic sensor, it is necessary to insert a button battery into the magnetic sensor. However, since the truck runs every day, even if the button battery runs out, it is not easy to replace the button battery.

[0005] Therefore, the present disclosure proposes a technique that can detect the opening and closing of a truck door without battery replacement.

Means for Solving the Problems

[0006] The door opening / closing detection system of the present disclosure includes a magnet, a first beacon device, a second beacon device, and a detection device. The magnet is installed on a door of a truck body. The first beacon device is installed on a door frame of the truck body, and includes a first coil and a first transmission unit that transmits a first beacon by being driven by a current generated by electromagnetic induction occurring between the magnet and the first coil. The second beacon device is installed on a side panel of the truck body, and includes a second coil and a second transmission unit that transmits a second beacon by being driven by a current generated by electromagnetic induction occurring between the magnet and the second coil. The detection device detects the opening / closing of the door based on the reception order of the first beacon and the second beacon.

Advantages of the Invention

[0007] According to the disclosed technology, it is possible to detect the opening / closing of a truck door without the need for battery replacement.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

MODE FOR CARRYING OUT THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, the same components are denoted by the same reference numerals.

[0010] [Embodiment] <Configuration of Door Opening / Closing Detection System> FIG. 1 is a diagram showing a configuration example of the door opening / closing detection system of the present disclosure. In FIG. 1, the door opening / closing detection system 1 includes a first beacon device 20A, a second beacon device 20B, a magnet 30, a cargo compartment camera 40, and an opening / closing detection device 50. The first beacon device 20A has an antenna 24A, and the second beacon device 20B has an antenna 24B. The opening / closing detection device 50 includes a receiving antenna 51, a beacon receiving unit 52, an opening / closing determination unit 53, a camera control unit 54, a wireless transmission unit 55, and a transmission antenna 56.

[0011] <Installation of Door Opening / Closing Detection System> FIGS. 2 and 3 are diagrams showing an installation example of the door opening / closing detection system of the present disclosure. As shown in FIGS. 2 and 3, the door opening / closing detection system 1 is installed in the truck 10. FIG. 2 is a view seen from the rear of the truck 10, and FIG. 3 is a view seen from the right side of the truck 10.

[0012] In FIGS. 2 and 3, the truck 10 has a cabin 14 and a van body 11. The van body 11 has a left rear door 12L, a right rear door 12R, a rear door frame 16, and a side panel 15. The first beacon device 20A is installed on the rear door frame 16. The magnet 30 is installed on the right rear door 12R. The cargo compartment camera 40 is installed in the cargo compartment 13 of the van body 11. The second beacon device 20B and the opening / closing detection device 50 are installed on the side panel 15. As an example, the second beacon device 20B and the opening / closing detection device 50 are installed on the frame of the side panel 15.

[0013] In this embodiment, the opening / closing detection of the right rear door 12R is taken as an example for explanation. However, the disclosed technology is also applicable to the opening / closing detection of the left rear door 12L and the side door.

[0014] <Installation of Magnet, First Beacon Device and Second Beacon Device> FIGS. 4 and 5 are diagrams showing installation examples of the magnet, the first beacon device and the second beacon device of the present disclosure. As shown in FIG. 4, the magnet 30 and the first beacon device 20A are installed so as to face each other when the right rear door 12R is fully closed. Also, as shown in FIG. 5, the magnet 30 and the second beacon device 20B are installed so as to face each other when the right rear door 12R is fully open.

[0015] <Configuration of First Beacon Device and Second Beacon Device> FIG. 6 is a diagram showing a configuration example of the first beacon device of the present disclosure, and FIG. 7 is a diagram showing a configuration example of the second beacon device of the present disclosure.

[0016] In FIG. 6, the first beacon device 20A has a coil 21A, a power control unit 22A, a beacon transmission unit 23A, and an antenna 24A. The coil 21A is arranged at a position facing the N pole of the magnet 20 when the right rear door 12R is fully closed.

[0017] Also, in FIG. 7, the second beacon device 20B includes a coil 21B, a power control unit 22B, a beacon transmission unit 23B, and an antenna 24B. The coil 21B is disposed at a position facing the S pole of the magnet 20 when the right rear door 12R is fully opened.

[0018] <Operation of the Door Opening / Closing Detection System> FIGS. 8, 9, 10, and 11 are diagrams for explaining operation examples of the door opening / closing detection system of the present disclosure. FIGS. 8 and 9 show the state when the right rear door 12R is opened from the fully closed state, and FIGS. 10 and 11 show the state when the right rear door 12R is closed from the fully open state.

[0019] In FIG. 8, when the right rear door 12R, which was in the fully closed state, is opened and the N pole of the magnet 30 installed on the right rear door 12R moves away from the coil 21A of the first beacon device 20A installed on the rear door frame 16, electromagnetic induction is generated in the coil 21A such that the right rear door 12R side between the right rear door 12R side and the luggage compartment 13 side is the S pole and the luggage compartment 13 side is the N pole. Therefore, an induced current I flowing from the S pole to the N pole is generated. The induced current I generated in the coil 21A flows from the N pole side of the coil 21A to the power control unit 22A. Here, when the N pole of the magnet 30 moves away from the coil 21A and when the magnet 30 approaches the coil 21A, the direction of electromagnetic induction with respect to the coil 21A, that is, the direction of the induced current I with respect to the coil 21A, is reversed. Therefore, the power control unit 22A supplies the induced current I to the beacon transmission unit 23A as the driving power of the beacon transmission unit 23A after making the direction of the input induced current I constant. When the beacon transmission unit 23A is supplied with the driving power from the power control unit 22A, the first beacon BA is transmitted from the antenna 24A.

[0020] Next, in FIG. 9, when the right rear door 12R is further opened from the state shown in FIG. 8 and the S pole of the magnet 30 installed on the right rear door 12R approaches the coil 21B of the second beacon device 20B installed on the side panel 15, electromagnetic induction is generated in the coil 21B with the S pole on the right rear door 12R side and the N pole on the luggage compartment 13 side among the right rear door 12R side and the luggage compartment 13 side. Therefore, an induced current I flowing from the S pole to the N pole is generated. The induced current I generated in the coil 21B flows from the N pole side of the coil 21B to the power supply control unit 22B. Here, when the S pole of the magnet 30 approaches the coil 21B and when it moves away from the coil 21B, the direction of electromagnetic induction with respect to the coil 21B, that is, the direction of the induced current I with respect to the coil 21B, is reversed. Therefore, the power supply control unit 22B makes the direction of the input induced current I constant and then supplies the induced current I to the beacon transmission unit 23B as the driving power of the beacon transmission unit 23B. When the beacon transmission unit 23B is supplied with the driving power from the power supply control unit 22B, the second beacon BB is transmitted from the antenna 24B.

[0021] On the other hand, in FIG. 10, when the right rear door 12R in the fully open state is closed and the S pole of the magnet 30 installed on the right rear door 12R moves away from the coil 21B of the second beacon device 20B installed on the side panel 15, electromagnetic induction is generated in the coil 21B with the S pole on the luggage compartment 13 side and the N pole on the right rear door 12R side among the right rear door 12R side and the luggage compartment 13 side. Therefore, an induced current I flowing from the S pole to the N pole is generated. The induced current I generated in the coil 21B flows from the N pole side of the coil 21B to the power supply control unit 22B. The power supply control unit 22B makes the direction of the input induced current I constant and then supplies the induced current I to the beacon transmission unit 23B as the driving power of the beacon transmission unit 23B. When the beacon transmission unit 23B is supplied with the driving power from the power supply control unit 22B, the second beacon BB is transmitted from the antenna 24B.

[0022] Next, in FIG. 11, when the right rear door 12R is further closed from the state shown in FIG. 10, when the N pole of the magnet 30 installed on the right rear door 12R approaches the coil 21A of the first beacon device 20A installed on the rear door frame 16, electromagnetic induction with the cargo compartment 13 side of the right rear door 12R side and the cargo compartment 13 side being the S pole and the right rear door 12R side being the N pole is generated in the coil 21A, so an induced current I flowing from the S pole to the N pole is generated. The induced current I generated in the coil 21A flows from the N pole side of the coil 21A to the power control unit 22A. The power control unit 22A makes the direction of the input induced current I constant and then supplies the induced current I to the beacon transmission unit 23A as the driving power of the beacon transmission unit 23A. When the beacon transmission unit 23A is supplied with driving power from the power control unit 22A, it transmits the first beacon BA from the antenna 24A.

[0023] The first beacon BA transmitted from the beacon transmission unit 23A and the second beacon BB transmitted from the beacon transmission unit 23B are received by the beacon reception unit 52 (FIG. 1) via the reception antenna 51. The beacon reception unit 52 outputs the received first beacon BA and second beacon BB to the opening / closing determination unit 53.

[0024] Here, as shown in FIGS. 8 and 9 above, when the right rear door 12R is opened from fully closed to fully open, after the first beacon BA is transmitted from the beacon transmission unit 23A, the second beacon BB is transmitted from the beacon transmission unit 23B, so the beacon reception unit 52 will receive the second beacon BB after receiving the first beacon BA. On the other hand, as shown in FIGS. 10 and 11 above, when the right rear door 12R is closed from fully open to fully closed, after the second beacon BB is transmitted from the beacon transmission unit 23B, the first beacon BA is transmitted from the beacon transmission unit 23A, so the beacon reception unit 52 will receive the first beacon BA after receiving the second beacon BB.

[0025] Therefore, when the second beacon BB is input within a predetermined time (e.g., within 30 seconds) after the first beacon BA is input, the opening / closing determination unit 53 determines that the right rear door 12R has been opened. On the other hand, when the first beacon BA is input within a predetermined time (e.g., within 30 seconds) after the second beacon BB is input, the opening / closing determination unit 53 determines that the right rear door 12R has been closed. In this way, the opening / closing determination unit 53 detects the opening and closing of the right rear door 12R based on the reception order of the first beacon BA and the second beacon BB. When the opening / closing determination unit 53 detects the opening and closing of the right rear door 12R, it outputs a signal indicating that the opening and closing have been detected (hereinafter sometimes referred to as an "opening / closing detection signal") to the camera control unit 54 and the wireless transmission unit 55. For example, when the opening / closing determination unit 53 determines that the right rear door 12R has been opened, it outputs an opening / closing detection signal set to '+1', and when it determines that the right rear door 12R has been closed, it outputs an opening / closing detection signal set to '-1'.

[0026] When the opening / closing detection signal set to '+1' is input from the opening / closing determination unit 53, the camera control unit 54 instructs the luggage compartment camera 40 to start shooting a video, and when the opening / closing detection signal set to '-1' is input from the opening / closing determination unit 53, it instructs the luggage compartment camera 40 to end shooting a video. In accordance with such an instruction from the camera control unit 54, the luggage compartment camera 40 starts shooting a video in the luggage compartment 13 when it is detected that the right rear door 12R has been opened, and ends shooting a video in the luggage compartment 13 when it is detected that the right rear door 12R has been closed. When the luggage compartment camera 40 finishes shooting a video in the luggage compartment 13, it outputs the video data to the camera control unit 54, and the camera control unit 54 outputs the video data input from the luggage compartment camera 40 to the wireless transmission unit 55.

[0027] The wireless transmission unit 55 wirelessly transmits the opening / closing detection signal and the video data via the transmission antenna 56. The opening / closing detection signal and the video data wirelessly transmitted from the opening / closing detection device 50 are stored in a server connected to the opening / closing detection device 50 via a predetermined network.

[0028] The above is the description of the embodiment.

[0029] As described above, the door opening / closing detection system of the present disclosure (the door opening / closing detection system 1 of the embodiment) includes a magnet (magnet 30 of the embodiment), a first beacon device (first beacon device 20A of the embodiment), a second beacon device (second beacon device 20B of the embodiment), and a detection device (opening / closing detection device 50 of the embodiment). The magnet is installed on a door (right rear door 12R of the embodiment) of a van body (van body 11 of the embodiment) of a truck (truck 10 of the embodiment). The first beacon device is installed on a door frame (rear door frame 16 of the embodiment) of the van body, and includes a first coil (coil 21A of the embodiment) and a first transmission unit (beacon transmission unit 23A of the embodiment) that transmits a first beacon (first beacon BA of the embodiment) by being driven by a current generated by electromagnetic induction occurring between the magnet installed on the door and the first coil. The second beacon device is installed on a side panel (side panel 15 of the embodiment) of the van body, and includes a second coil (coil 21B of the embodiment) and a second transmission unit (beacon transmission unit 23B of the embodiment) that transmits a second beacon (second beacon BB of the embodiment) by being driven by a current generated by electromagnetic induction occurring between the magnet installed on the door and the second coil. The detection device detects the opening / closing of the door based on the reception order of the first beacon and the second beacon.

[0030] For example, when the second beacon is received after the first beacon is received within a predetermined time, the detection device determines that the door has been opened, while when the first beacon is received after the second beacon is received within a predetermined time, the detection device determines that the door has been closed.

[0031] By doing so, it is possible to detect the opening / closing of the truck door without the need for battery replacement.

[0032] In addition, the door opening / closing detection system of the present disclosure includes a camera (the cargo compartment camera 40 in the embodiment). When the detection device detects that the door has been opened, the camera starts shooting a video inside the cargo compartment of the van body. On the other hand, when the detection device detects that the door has been closed, the camera ends shooting the video inside the cargo compartment of the van body.

[0033] By doing so, it is possible to grasp the loading state of the luggage that changes every time the luggage is loaded and unloaded. Therefore, it is possible to improve the way of loading the luggage, and by improving the way of loading the luggage, it is possible to enhance the transportation quality of the luggage.

Explanation of Signs

[0034] 10 Truck 11 Van body 12R Right rear door 12L Left rear door 15 Side panel 16 Rear door frame 1 Door opening / closing detection system 30 Magnet 20A First beacon device 20B Second beacon device 21A, 21B Coil 23A, 23B Beacon transmission unit 50 Opening / closing detection device 40 Cargo compartment camera

Claims

1. A magnet installed on a door of a truck's van body, a first beacon device installed on a door frame of the van body, having a first coil, and a first transmitting unit that transmits a first beacon by being driven by an electric current generated by electromagnetic induction occurring between the magnet and the first coil, a second beacon device installed on a side panel of the van body, having a second coil, and a second transmitting unit that transmits a second beacon by being driven by an electric current generated by electromagnetic induction occurring between the magnet and the second coil, a detection device that detects the opening and closing of the door based on the reception order of the first beacon and the second beacon, A door opening / closing detection system comprising the above.

2. When the second beacon is received after the first beacon is received within a predetermined time, the detection device determines that the door is opened. On the other hand, when the first beacon is received after the second beacon is received within the predetermined time, the detection device determines that the door is closed. The door opening / closing detection system according to Claim 1.

3. A camera that starts shooting a video inside the cargo compartment of the van body when it is detected by the detection device that the door is opened, and ends the shooting of the video when it is detected by the detection device that the door is closed. The door opening / closing detection system according to Claim 1 further comprises the camera. The door opening / closing detection system according to Claim 1.

Images