Wireless transmission system and wireless transmission device

Abstract

The aim is to improve the stability of wireless communication between the vehicle body and the sliding door. [Solution] The wireless transmission system 20 is a wireless transmission system for a vehicle comprising a vehicle body 12 and a sliding body 14, and comprises a first wireless transmission device 30 including a first wireless device 32 and a leakage wire 34 connected to the first wireless device, and a second wireless transmission device 40 including a second wireless device 42 and an antenna 44 connected to the second wireless device. One of the first wireless transmission device 30 and the second wireless transmission device 40 is supported by the vehicle body 12, and the other is supported by the sliding body 14. The leakage wire 34 is arranged along the sliding direction SD of the sliding body 14.

Description

Technical Field

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[0001] The present disclosure relates to a wireless transmission system and a wireless transmission device.

Background Art

[0002] Patent Document 1 discloses an in-vehicle electrical system including a wire harness including a power line and a transceiver for transmitting and receiving at least a part of a control signal between a vehicle and a slide door, the transceiver having a first transceiver provided on the vehicle side and a second transceiver provided on the slide door side, and wireless communication being performed between the two.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] <00000​​​​​​​​​​​​​​​The wireless transmission system of the present disclosure is a wireless transmission system for a vehicle comprising a vehicle body and a sliding body, comprising: a first wireless transmission device including a first wireless device and a leakage wire connected to the first wireless device; and a second wireless transmission device including a second wireless device and an antenna connected to the second wireless device, wherein one of the first wireless transmission device and the second wireless transmission device is supported by the vehicle body and the other is supported by the sliding body, and the leakage wire is arranged along the sliding direction of the sliding body.

[0008] Furthermore, the wireless transmission device of this disclosure is a wireless transmission device in a wireless transmission system for a vehicle comprising a vehicle body and a sliding body, comprising a wireless device and a leakage wire connected to the wireless device, wherein the leakage wire is arranged along the sliding direction of the sliding body. [Effects of the Invention]

[0009] According to this disclosure, wireless communication between the vehicle body and the sliding door can be made more stable. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a schematic diagram showing a wireless transmission system incorporated into a vehicle. [Figure 2] Figure 2 is a schematic plan view showing the spatial relationship of the wireless transmission system. [Figure 3] Figure 3 is an explanatory diagram showing the positional changes between the leakage wire and the antenna due to the opening and closing of the sliding door. [Figure 4] Figure 4 is an explanatory diagram showing a leaky coaxial cable. [Figure 5] Figure 5 is an explanatory diagram showing an example of leakage wire arrangement in a modified example. [Figure 6] Figure 6 is an explanatory diagram showing an example of the arrangement of leakage wires and antennas in other modified cases. [Modes for carrying out the invention]

[0011] [Description of Embodiments in this Disclosure] First, embodiments of the present disclosure will be listed and described.

[0012] The wireless transmission system of the present disclosure is as follows.

[0013] (1) A wireless transmission system for a vehicle including a vehicle body and a slide body, comprising a first wireless transmission device including a first wireless device and a leaky cable connected to the first wireless device, and a second wireless transmission device including a second wireless device and an antenna connected to the second wireless device, wherein one of the first wireless transmission device and the second wireless transmission device is supported by the vehicle body and the other is supported by the slide body, and the leaky cable is arranged along the slide direction of the slide body.

[0014] According to the present disclosure, one of the first wireless transmission device and the second wireless transmission device is supported by the vehicle body, the other is supported by the slide body, and the leaky cable is arranged along the slide direction of the slide body. Therefore, the distance between the leaky cable and the antenna is easily kept constant, and wireless communication between the vehicle body and the slide body can be further stabilized.

[0015] (2) The wireless transmission system of (1), wherein the slide body is a slide door movably supported so as to be able to open and close an opening for a door of the vehicle body, and the other of the first wireless transmission device and the second wireless transmission device may be supported by the slide body.

[0016] Thereby, wireless communication between the vehicle body and the slide door can be further stabilized.

[0017] (3) The wireless transmission system of (2), wherein the first wireless transmission device is supported by the vehicle body, the second wireless transmission device is supported by the slide door, and the leaky cable may be arranged along the opening edge of the opening for the door in the vehicle body.

[0018] Thereby, the leaky cable can be easily arranged on the vehicle body.

[0019] (4)(3)'s wireless transmission system, wherein the leaky cable may be arranged along the lower edge or the upper edge of the door opening in the vehicle body.

[0020] The leaky cable is easily arranged near the floor or the roof of the vehicle body.

[0021] (5)(3) or (4)'s wireless transmission system, wherein the sliding door is movable between a closed position for closing the door opening and an open position for opening the door opening, and in a state where the sliding door is in the open position, the antenna may be supported at a position closer to the closed position in the sliding door.

[0022] Thereby, whether in the open position or the closed position, the antenna is likely to be arranged near the leaky cable arranged along the edge for the door.

[0023] (6) Any one of the wireless transmission systems from (1) to (5), wherein the leaky cable may be a twisted pair cable.

[0024] Thereby, it is easy to realize the wireless transmission system at a low cost.

[0025] (7) Any one of the wireless transmission systems from (1) to (6), wherein the sliding body slides along a curved sliding path, and the leaky cable may be arranged along a path that curves according to the sliding path.

[0026] In this way, if the leaky cable is arranged along a path that curves according to the sliding path, the distance between the leaky cable and the antenna is likely to be kept constant, and wireless communication between the vehicle body and the sliding body can be more stabilized.

[0027] The wireless transmission device of the present disclosure is as follows.

[0028] (8) A wireless transmission device in a wireless transmission system for a vehicle comprising a vehicle body and a sliding body, comprising a wireless device and a leakage wire connected to the wireless device, wherein the leakage wire is arranged along the sliding direction of the sliding body.

[0029] According to this disclosure, the leakage wire is arranged along the sliding direction of the sliding body. As a result, the distance between the antennas that transmit and receive wireless signals and the leakage wire can be kept constant, and wireless communication between the vehicle body and the sliding body can be made more stable.

[0030] [Details of the embodiments of this disclosure] Specific examples of the wireless transmission systems and wireless transmission devices of this disclosure will be described below with reference to the drawings. However, this disclosure is not limited to these examples and is intended to include all modifications within the meaning and scope of the claims as indicated by the claims.

[0031] [Embodiment] The following describes the wireless transmission system and wireless transmission device according to the embodiment. Figure 1 is a schematic diagram showing the wireless transmission system 20 incorporated into the vehicle 10.

[0032] <About the vehicle> The wireless transmission system 20 is incorporated into a vehicle 10 comprising a vehicle body 12 and a sliding body. The sliding body is a component supported in the vehicle body 12 so as to be slidable. In this embodiment, an example is described in which the sliding body is a sliding door 14.

[0033] The vehicle body 12 includes the floor, roof, side panels, etc. The passenger compartment is the space enclosed by the vehicle body 12. The vehicle body 12 has door openings 12h. For example, door openings 12h are formed in the side panels.

[0034] The door opening 12h is an opening for occupants to get in and out. Figure 1 shows the door opening 12h for occupants to get in and out of the seats behind the driver's seat. The door opening 12h is formed, for example, midway in the front-to-rear direction of the side panel. The door opening 12h opens between the floor and the roof.

[0035] The sliding door 14 is supported so as to be movable, allowing it to open and close the door opening 12h. The position in which the sliding door 14 closes the door opening 12h is the closed position P1. The position in which the sliding door 14 opens the door opening 12h is the open position P2. The sliding door 14 can move between the closed position P1 and the open position P2. In this embodiment, the open position P2 is set after the closed position P1. That is, the sliding door 14, which is in the open position P2, can move backward to the closed position P1.

[0036] When the sliding door 14 is in the closed position P1, it is sufficient that at least a portion of the door opening 12h is open. In this embodiment, when the sliding door 14 is in the open position P2, the sliding door 14 partially blocks the door opening 12h. More specifically, the front part of the sliding door 14 blocks the rear part of the door opening 12h. When the sliding door 14 is in the open position P2, the entire door opening 12h may be open.

[0037] <About Wireless Transmission Systems> Figure 2 is a schematic plan view showing the positional relationship of the wireless transmission system 20 with respect to the vehicle body 12 and the sliding door 14.

[0038] The wireless transmission system 20 comprises a first wireless transmission device 30 and a second wireless transmission device 40.

[0039] The first wireless transmission device 30 comprises a first wireless device 32 and a leakage line 34 connected to the first wireless device 32.

[0040] The first wireless device 32 includes circuits for generating a modulated signal for wireless communication and for demodulating the signal. The signal generated by the first wireless device 32 is transmitted to the leakage line 34, and the signal is radiated as radio waves from the leakage line 34. When radio waves are received through the leakage line 34, a received signal corresponding to the radio waves is transmitted to the first wireless device 32 and demodulated.

[0041] The leakage wire 34 is a linear body that can leak radio waves along it. Preferably, the radio waves are radiated uniformly along the longitudinal direction of the leakage wire 34. The leakage wire 34 may be, for example, a line that radiates radio waves from multiple points aligned along its longitudinal direction.

[0042] The leakage wire 34 may be a twisted pair wire. A twisted pair wire is a cable in which two electric wires 34a are twisted together. For example, the twist pitch is set with respect to the frequency of the wireless signal, etc., so that the electric wires radiating at each twist pitch are in phase and reinforce each other. As a result, the twisted pair wire can radiate signals in the frequency band used for wireless communication along the twisted pair wire.

[0043] For example, if the wireless signal is Bluetooth®, the twisted-pair wires are designed so that the signal is radiated at 2.4 GHz. The wireless signal may also conform to other wireless standards. The frequency of the wireless signal may be other frequencies.

[0044] The first wireless device 32 is electrically connected to one end of the leakage wire 34. The other end of the leakage wire 34 may be short-circuited or connected to a terminating resistor.

[0045] The second wireless transmission device 40 comprises a second wireless device 42 and an antenna 44 connected to the second wireless device 42.

[0046] The second radio device 42 includes circuits for generating a modulated signal for wireless communication and for demodulating the signal. The signal generated by the second radio device 42 is transmitted to the antenna 44, and the signal is radiated from the antenna 44 as radio waves. When radio waves are received through the antenna 44, a received signal corresponding to the radio waves is transmitted to the second radio device 42 and demodulated.

[0047] Antenna 44 transmits and receives radio waves. The maximum length of antenna 44 is shorter than the leakage wire 34. Antenna 44 transmits and receives radio waves within a more limited radiation range than the leakage wire 34. Antenna 44 may be a small antenna, such as a patch antenna, a chip antenna, or a pattern antenna.

[0048] One of the first wireless transmission device 30 and the second wireless transmission device 40 is supported by the vehicle body 12, and the other is supported by a sliding door 14, which is a sliding body. The leakage wire 34 is positioned along the sliding direction SD of the sliding door 14. This makes it easier to maintain a constant distance between the leakage wire 34 and the antenna 44 even when the sliding door 14 is sliding.

[0049] <Example of the arrangement of the first and second wireless transmission devices> A more detailed explanation will be given regarding an example of the arrangement of the first wireless transmission device 30 and the second wireless transmission device 40.

[0050] In this embodiment, the first wireless transmission device 30 is supported by the vehicle body 12, and the second wireless transmission device 40 is supported by the sliding door 14. In other words, the leakage wire 34 is supported by the vehicle body 12, and the antenna 44 is supported by the sliding door 14.

[0051] The leakage wire 34 is positioned along the opening edge of the door opening 12h in the vehicle body 12. The sliding direction SD of the sliding door 14 is the longitudinal direction. The leakage wire 34 is positioned along the edge of the door opening 12h that is aligned in the longitudinal direction, for example, the lower edge or the upper edge. In this embodiment, an example is described in which the leakage wire 34 is positioned along the lower edge of the door opening 12h.

[0052] The leakage wire 34 is positioned, for example, on the side sill located at the lower edge of the door opening 12h, or on a portion of the floor that runs along the side sill. If it is on the side sill or on a portion of the floor that runs along the side sill, the leakage wire 34 is easily positioned at the same time as the work of laying the wire harness on the floor.

[0053] The length of the leakage wire 34 may be the length of the door opening 12h in the front-to-back direction or greater than that length.

[0054] The antenna 44 is positioned at a height corresponding to the height of the leakage wire 34. For example, the antenna 44 is positioned adjacent to the leakage wire 34 in the horizontal, vertical, or diagonal direction. In Figure 1, the antenna 44 is positioned at a height adjacent to the leakage wire 34 on the outside in the vehicle width direction.

[0055] With the sliding door 14 in the open position P2, the antenna 44 may be supported at a position on the sliding door 14 closer to the closed position P1. In this embodiment, the antenna 44 is positioned at a position on the sliding door 14 closer to the front.

[0056] When viewed from the side, the antenna 44 may be supported in a position within the door opening 12h, regardless of whether the sliding door 14 is in the closed position P1 or the open position P2. This makes it easier for the antenna 44 to be positioned opposite the leakage wire 34 that runs along the edge of the door opening 12h.

[0057] The first wireless device 32 may also be connected to the first electronic control unit 38 mounted on the vehicle body 12. The first electronic control unit 38 is connected to various electrical devices 39 mounted on the vehicle body 12.

[0058] The second wireless device 42 may be connected to a second electronic control unit 48 mounted on the sliding door 14. The second electronic control unit 48 is connected to various electrical devices 49 mounted on the sliding door.

[0059] The first electronic control unit 38 and the second electronic control unit 48 communicate wirelessly via the first wireless device 32 and leakage wire 34, and the second wireless device 42 and antenna 44. This allows the first electronic control unit 38 and the second electronic control unit 48 to cooperate with each other, receiving and controlling signals from various electrical devices 39 and 49.

[0060] <Example of wired connection> The electrical equipment 39 in the vehicle body 12 and the electrical equipment 49 in the sliding door 14 may be connected via wired wiring.

[0061] For example, a sliding wiring device 50 is incorporated into the sliding door 14. The sliding wiring device 50 supports a portion of the wired wiring 58 that is stretched between the vehicle body 12 and the sliding door 14 so that it can move along the sliding direction SD of the sliding door 14. The wired wiring 58 is connected to electrical equipment 39 on the vehicle body 12 side and to electrical equipment 49 on the sliding door 14 side.

[0062] The wired wiring 58 may include power lines. The wired wiring 58 may also include signal lines. The signal lines included in the wired wiring 58 may be lines that transmit signals for which more reliable signal transmission is required among a plurality of signals transmitted and received between the vehicle body 12 and the sliding door 14.

[0063] By making some signal lines wireless, the number of wires in the wired wiring (58) can be reduced, and the diameter can also be made smaller.

[0064] <Regarding positional changes due to opening and closing of sliding doors> Referring to Figure 3, the positional changes between the leakage wire 34 and the antenna 44 due to the opening and closing of the sliding door 14 will be explained.

[0065] The leakage line 34 is positioned along the sliding direction SD (front-to-back direction) on the lower edge of the door opening 12h. The leakage line 34 is located throughout the front-to-back direction on the lower edge of the door opening 12h.

[0066] With the sliding door 14 in the closed position P1, the antenna 44 is located towards the front of the sliding door 14, preferably at the front end, and faces the front end portion of the leakage wire 34. In this state, the distance between the antenna 44 and the leakage wire 34 is, for example, d1.

[0067] The sliding door 14 moves toward the open position P2. At this time, the sliding door 14 moves to the outside of the door opening 12h and moves toward the rear outside the side panel. The antenna 44 moves toward the rear and comes into contact with the rear end portion of the leakage wire 34. In this state, the distance between the antenna 44 and the leakage wire 34 is, for example, d2.

[0068] As the sliding door 14 moves outward from the door opening 12h, the distance d2 may be greater than the distance d1.

[0069] However, because the leakage wire 34 extends to the rear, the distance d2 can be made smaller than the distance between the front end of the leakage wire 34 and the antenna 44.

[0070] For example, consider a case where antennas are placed on both the vehicle body and the sliding door to transmit and receive radio waves from a single point. Also, suppose the front-to-back opening width of the door is 90 cm, the vehicle body antenna is positioned at the center of the door opening in the front-to-back direction, and the sliding door antenna is positioned at the front end of the sliding door. In this case, the distance between the two antennas is minimized when the sliding door is partially open or closed, and the distance between the antennas is approximately 45 cm when the sliding door is fully closed or fully open.

[0071] According to this embodiment, since the leakage wire 34 extends along the sliding direction SD, it is easy to set a small distance between the antenna 44 and the leakage wire 34 when the sliding door 14 is fully closed, fully open, and in the process of opening and closing. For example, even considering that the sliding door 14 moves outward in the vehicle width direction when it is in the process of opening and closing and when it is fully open, it is easy to set the maximum distance to about 30 cm.

[0072] By stabilizing the distance between the leakage wire 34 and the antenna 44, the received signal strength becomes constant, and communication becomes stable.

[0073] <Effects, etc.> With the wireless transmission system 20 and first wireless transmission device 30 configured as described above, one of the first wireless transmission device 30 and the second wireless transmission device 40 is supported by the vehicle body 12, and the other is supported by the sliding door 14, which is a sliding body. The leakage wire 34 is arranged along the sliding direction of the sliding door 14. As a result, the distance between the leakage wire 34 and the antenna 44 is more easily kept constant, and wireless communication between the vehicle body 12 and the sliding door 14 can be made more stable.

[0074] Furthermore, since the leakage wire 34 is positioned along the opening edge of the door opening 12h in the vehicle body 12, the leakage wire 34 can be easily positioned on the vehicle body.

[0075] For example, by positioning the leakage wire 34 along the lower edge of the door opening 12h in the vehicle body 12, it is easy to position the leakage wire 34 along the lower edge in conjunction with the work of laying floor wiring.

[0076] Furthermore, since the leakage wire 34 is linear in shape, it can be easily placed in narrow spaces and also offers excellent flexibility in shape.

[0077] Furthermore, when the sliding door 14 is in the open position P2, if the antenna 44 is supported at a position closer to the closed position P1 of the sliding door 14, the antenna 44 is likely to be positioned near the leakage line 34 which is located along the edge of the door opening 12h, whether in the open position P2 or the closed position P1.

[0078] Furthermore, twisted pair wires can be manufactured by twisting wires together, making them easy to produce at low cost. If the leakage wire 34 is a twisted pair wire, the wireless transmission system 20 can be realized at low cost.

[0079] [Differentiation] In this embodiment, an example in which the leakage wire is a twisted pair wire has been described. The leakage wire can be any wire that can leak radio waves along a linear body, and it does not need to be a twisted pair wire. As shown in Figure 4, a leaky coaxial cable 134 may be used as the leakage wire.

[0080] The leaky coaxial cable 134 is a cable comprising an inner conductor 134a, an insulator 134b, an outer conductor 134c, and a sheath 134d. The inner conductor 134a, the insulator 134b, the outer conductor 134c, and the sheath 134d are arranged concentrically in this order from the center outward.

[0081] Multiple openings 134ch are formed in the outer conductor 134c at intervals along the longitudinal direction of the leaky coaxial cable 134. Radio waves leak from each opening 134ch, causing them to propagate along the leaky coaxial cable 134.

[0082] Furthermore, in the case of a sliding body, such as a sliding door 14, the sliding door 14 may slide along a curved sliding path Pv. For example, as shown in Figure 5, the sliding door 14 moves from a closed position P1 to an open position P2 while moving outward in the vehicle width direction.

[0083] In this case, the leakage wire 34 may be arranged along a path that curves in accordance with the sliding path Pv. The arrangement path of the leakage wire 34 may be the same as the sliding path Pv. The arrangement path of the leakage wire 34 may be a path in which the direction of curving in the vehicle width direction is the same as that of the sliding path Pv, but the amount of displacement in the vehicle width direction is small. In other words, a path that curves in accordance with the sliding path Pv is a path in which the direction of curving is the same as that of the sliding path Pv, but the amount of displacement may be the same or different.

[0084] In this case, the distance between the leakage wire 34 and the antenna 44 can be kept more constant, and wireless communication between the vehicle body 12 and the sliding door 14 can be made more stable.

[0085] The arrangement of the leakage wire 34 and antenna 44 is not limited to the example shown above. Figure 6 shows other examples of the arrangement of the leakage wire and antenna.

[0086] As shown in Figure 6, the leakage wire 234 may be positioned along the upper edge of the door opening 12h, and the antenna 244 may be positioned towards the front of the upper part of the sliding door 14.

[0087] As shown in Figure 6, the leakage wire 334 may be positioned along the lower edge of the sliding door 14, and the antenna 344 may be positioned towards the rear of the lower edge of the door opening 12h.

[0088] As shown in Figure 6, the leakage wire 434 may be positioned along the sliding direction SD on the rear side of the door opening 12h within the vehicle body 12, and the antenna 444 may be positioned towards the rear in the sliding direction.

[0089] In all cases shown in Figure 6, the distance fluctuations between leakage lines 234, 334, and 434 and antennas 244, 344, and 444 can be reduced compared to the case where the two antennas fluctuate in position, thus stabilizing communication.

[0090] Furthermore, in this embodiment, an example in which the sliding body is a sliding door has been described. The sliding body does not have to be a sliding door, but can be any component that is supported in a manner that allows it to slide within the vehicle body. For example, a sliding seat that is supported in a manner that allows it to slide within the vehicle body may be the sliding body. In this case, the wireless transmission system may have a second wireless transmission device including a leakage wire supported on one side of the vehicle body floor and the sliding seat, and a second wireless transmission device including an antenna supported on the other side.

[0091] Furthermore, the components described in the above embodiments and each of the modified examples can be combined as appropriate, as long as they do not contradict each other. [Explanation of Symbols]

[0092] 10 vehicles 12 car bodies 12h Door opening 14 Sliding Doors 20 Wireless transmission systems 30. First Wireless Transmission Device 32 1st radio device 34, 234, 334, 434 Leakage wires 34a electric wire 38 First Electronic Control Unit 39, 49 Electrical equipment 40. Second Wireless Transmission Device 42 Second radio device 44, 244, 344, 444 antennas 48. Second Electronic Control Unit 50. Slide-type wiring device 58 Wired wiring 134 Leaky coaxial cable 134a Inner conductor 134b Insulator 134c outer conductor 134ch aperture 134d Sheath P1 closed position P2 open position Pv slide path SD slide direction d1, d2 distance

Claims

1. A wireless transmission system for a vehicle comprising a vehicle body and a sliding body, A first wireless transmission device including a first wireless device and a leakage line connected to the first wireless device, A second wireless transmission device including a second wireless device and an antenna connected to the second wireless device, Equipped with, One of the first wireless transmission device and the second wireless transmission device is supported by the vehicle body, and the other is supported by the slide body. A wireless transmission system in which the leakage wire is arranged along the sliding direction of the sliding body.

2. A wireless transmission system according to claim 1, The sliding body is a sliding door that is supported so as to be movable so as to be able to open and close the door opening of the vehicle body. A wireless transmission system in which the other of the first wireless transmission device and the second wireless transmission device is supported by the sliding body.

3. A wireless transmission system according to claim 2, The first wireless transmission device is supported by the vehicle body, and the second wireless transmission device is supported by the sliding door. The leakage wire is a wireless transmission system arranged along the opening edge of the door opening in the vehicle body.

4. A wireless transmission system according to claim 3, The leakage wire is a wireless transmission system arranged along the lower or upper edge of the door opening in the vehicle body.

5. A wireless transmission system according to claim 3 or claim 4, The sliding door is movable between a closed position that closes the door opening and an open position that opens the door opening. A wireless transmission system in which, when the sliding door is in the open position, the antenna is supported on the sliding door at a position closer to the closed position.

6. A wireless transmission system according to any one of claims 1 to 4, The aforementioned leakage wire is a twisted-pair wire in a wireless transmission system.

7. A wireless transmission system according to any one of claims 1 to 4, The aforementioned sliding body slides along a curved sliding path, The leakage wire is arranged along a path that curves according to the sliding path in a wireless transmission system.

8. A wireless transmission device in a wireless transmission system for a vehicle comprising a vehicle body and a sliding body, Wireless device and A leakage wire connected to the aforementioned wireless device, Equipped with, A wireless transmission device in which the leakage wire is arranged along the sliding direction of the sliding body.

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