WO2017069108A1 - Système de communication pour véhicule et dispositif monté sur véhicule - Google Patents

Système de communication pour véhicule et dispositif monté sur véhicule Download PDF

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Publication number
WO2017069108A1
WO2017069108A1 PCT/JP2016/080795 JP2016080795W WO2017069108A1 WO 2017069108 A1 WO2017069108 A1 WO 2017069108A1 JP 2016080795 W JP2016080795 W JP 2016080795W WO 2017069108 A1 WO2017069108 A1 WO 2017069108A1
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WIPO (PCT)
Prior art keywords
vehicle
portable device
magnetic core
received signal
signal strength
Prior art date
Application number
PCT/JP2016/080795
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English (en)
Japanese (ja)
Inventor
芳博 濱田
誠 佐分利
亮太 吉田
Original Assignee
住友電気工業株式会社
住友電装株式会社
株式会社オートネットワーク技術研究所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 住友電気工業株式会社, 住友電装株式会社, 株式会社オートネットワーク技術研究所 filed Critical 住友電気工業株式会社
Publication of WO2017069108A1 publication Critical patent/WO2017069108A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B49/00—Electric permutation locks; Circuits therefor ; Mechanical aspects of electronic locks; Mechanical keys therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/59—Responders; Transponders

Definitions

  • the present application relates to a vehicle communication system and an in-vehicle device.
  • This application claims priority based on Japanese Patent Application No. 2015-207268 filed on Oct. 21, 2015, and incorporates all the content described in the above Japanese application.
  • a vehicle communication system that locks and unlocks a vehicle door without using a mechanical key has been put into practical use.
  • a keyless entry system that locks or unlocks a vehicle door by wireless remote control using a portable device possessed by the user, a user who possesses the portable device only approaches the vehicle or holds the door handle
  • the Smart Entry (registered trademark) system that unlocks vehicle doors has been put into practical use.
  • a vehicle communication system that starts a vehicle engine without using a mechanical key has been put into practical use.
  • a push start system in which a user having a portable device starts an engine only by pressing an engine start button has been put into practical use.
  • the in-vehicle device communicates with the portable device by a radio signal, performs authentication, and performs control related to predetermined operations such as unlocking, locking, engine starting, and the like. Moreover, in order to prevent an unauthorized operation, the in-vehicle device confirms that the portable device exists at a predetermined position before performing the operation. As a method for confirming the position of the portable device, a method described in Patent Document 1 is known.
  • Patent Document 1 discloses a keyless entry device in which a portable device receives signals transmitted from a plurality of transmission antennas provided in a vehicle, and determines the position of the portable device from the received signal strength of each signal received by the portable device. It is disclosed.
  • the in-vehicle device according to Patent Document 1 stores in advance data for determining the position of the portable device. Specifically, portable devices are arranged at a plurality of locations along the inside of the vehicle interior / exterior boundary surface, signals transmitted from a plurality of transmission antennas connected to the vehicle-mounted device are received by the portable device, and reception of the signals is performed. Measure signal strength.
  • the portable device is arranged at a plurality of locations along the outside of the vehicle interior / exterior boundary surface, and signals transmitted from a plurality of transmission antennas connected to the vehicle-mounted device are received by the portable device, and the received signal of the signal is received. Measure strength.
  • the in-vehicle device measures the vehicle interior data group including a plurality of received signal strengths measured along the inside of the vehicle interior / exterior boundary surface and the mobile device along the outside of the vehicle interior / exterior boundary surface.
  • a vehicle exterior data group including a plurality of received signal strengths is stored in advance.
  • the portable device measures the received signal strength of signals transmitted from the plurality of transmitting antennas, and transmits the measured received signal strength to the in-vehicle device.
  • the in-vehicle device receives the received signal strength transmitted from the portable device, and determines whether the received signal strength measured by the portable device is closer to the vehicle interior data group or the vehicle exterior data group based on the Mahalanobis distance. When the received signal strength is close to the vehicle interior data group, the in-vehicle device determines that the portable device is in the vehicle interior, and when it is close to the vehicle interior data group, the mobile device is determined to be outside the vehicle interior.
  • a transmission antenna is arranged on a movable part of a door mirror that opens and closes by rotating. For this reason, the directivity of the transmission antenna changes due to the rotation of the door mirror, and the received signal strength measured by the portable device changes.
  • the received signal strength changes, there is a possibility that, for example, a portable device outside the vehicle compartment is erroneously determined to be inside the vehicle compartment, or that a portable device inside the vehicle interior is erroneously determined to be outside the vehicle compartment.
  • the keyless entry device individually stores vehicle interior data groups measured by placing portable devices along the inside of the vehicle when the door mirror is opened and closed. .
  • the keyless entry device individually stores a vehicle exterior data group measured by placing a portable device along the outside of the vehicle when the door mirror is opened and closed.
  • the keyless entry device detects the open / closed state of the door mirror, and when the door mirror is open, the portable device is in the vehicle interior using the vehicle interior data group and the vehicle exterior data group obtained with the door mirror open.
  • the door mirror is closed, it is determined whether the portable device is in the vehicle interior using the vehicle interior data group and the vehicle exterior data group obtained with the door mirror closed.
  • Patent Document 2 discloses a communication system including a vehicle antenna device that remotely locks and unlocks a vehicle door.
  • the vehicular antenna device according to Patent Document 2 includes a transmission antenna disposed on a fixed portion for rotatably supporting a movable portion of a door mirror.
  • the vehicular antenna device performs radio communication with a card unique to the vehicle by using a transmission antenna arranged in a fixed portion, and performs authentication of the card. If the authentication is successful, the vehicle door is unlocked, and if the authentication fails, the vehicle door is locked.
  • the directivity of the transmission antenna does not change even when the movable part of the door mirror rotates, so that the driver can reliably perform the remote operation of locking and unlocking within a predetermined range.
  • a vehicle communication system includes an in-vehicle device that transmits a signal from one or a plurality of transmission antennas provided in the vehicle, a signal that is transmitted from the in-vehicle device, and a response to the received signal.
  • a portable device that transmits the response signal, the vehicle-mounted device receives the response signal transmitted from the portable device, and determines whether the portable device is in the vehicle interior based on the received response signal
  • a communication system for a vehicle wherein at least one of the transmission antennas is disposed in a movable part rotatably supported around a shaft part provided in the vehicle, and a rod-shaped magnetic core;
  • a coil wound around the outer periphery of the magnetic core, and an angle formed by the shaft portion and the magnetic core is not less than 0 degrees and not more than 45 degrees.
  • An in-vehicle device transmits a signal from one or a plurality of transmission antennas provided in a vehicle to a portable device, and the portable device is in a vehicle interior based on a response signal from the portable device.
  • the at least one transmission antenna is arranged in a movable part supported rotatably around a shaft part provided in the vehicle, and is a rod-shaped magnetic body
  • the coil includes a core and a coil wound around the outer periphery of the magnetic core, and an angle formed by the shaft portion and the magnetic core is not less than 0 degrees and not more than 45 degrees.
  • the present application can be realized not only as a vehicle communication system and an in-vehicle device including such a characteristic processing unit, but also as a vehicle communication method using such characteristic processing as a step.
  • it can implement
  • An object of the present application is to provide a vehicle communication system and an in-vehicle device capable of accurately determining whether or not a portable device is in a vehicle compartment.
  • the transmission antenna that transmits a signal for determining whether or not the portable device is in the vehicle interior is arranged on the movable portion of the vehicle, the transmission antenna is irrespective of the rotation position. It is possible to provide a vehicle communication system and an in-vehicle device that can accurately determine whether or not the portable device is in the vehicle interior.
  • a vehicle communication system receives and receives an in-vehicle device that transmits a signal from one or a plurality of transmission antennas provided in the vehicle, and a signal transmitted from the in-vehicle device.
  • a portable device that transmits a response signal according to the signal, the in-vehicle device receives the response signal transmitted from the portable device, and based on the received response signal, whether the portable device is in the vehicle interior
  • the at least one transmitting antenna is arranged in a movable part supported rotatably around a shaft part provided in the vehicle, and is a rod-shaped magnetic body.
  • the coil includes a core and a coil wound around the outer periphery of the magnetic core, and an angle formed by the shaft portion and the magnetic core is not less than 0 degrees and not more than 45 degrees.
  • the magnetic core constituting the transmission antenna is arranged on a movable part that is rotatably supported around a shaft part provided in the vehicle.
  • the movable part is, for example, a movable part of a door mirror.
  • the longitudinal direction of the magnetic core is substantially parallel to the shaft portion.
  • the position of the transmission antenna with respect to the vehicle changes.
  • the magnetic core and the shaft part are substantially parallel, transmission is possible even if the movable part rotates.
  • the change in the magnetic field distribution of the signal transmitted from the antenna is slight (see FIG. 14B). Therefore, it can be accurately determined whether or not the portable device is in the vehicle interior, regardless of the rotational position of the movable portion.
  • substantially parallel does not necessarily mean that the angle formed between the magnetic core and the shaft portion is 0 degree, and the angle formed between the magnetic body core and the shaft portion is about 0 degree to 25 degrees, preferably about 0 degree.
  • a configuration in which the angle is not less than 20 degrees, more preferably not less than about 0 degrees and not more than 10 degrees, and more preferably not less than about 0 degrees and not more than 5 degrees is also included in this embodiment.
  • the shaft portion includes a conductive material, and the magnetic core and the shaft portion are separated from each other.
  • the shaft portion includes a conductive material
  • the signal transmitted from the transmission antenna is attenuated at the shaft portion.
  • the magnetic core is separated from the shaft portion, signal attenuation can be suppressed.
  • the distance between the magnetic core and the shaft is 6 cm or less.
  • the distance between the magnetic core and the shaft portion is 6 cm or less, suppressing the attenuation of the signal transmitted from the transmitting antenna, and suppressing the change in the magnetic field distribution of the signal due to the rotation of the movable portion. be able to.
  • the distance of 6 cm is the distance between the center point of the shaft portion and the center point of the magnetic core.
  • the distance between the magnetic core and the shaft is more preferably 1 cm or more and 2 cm or less.
  • the in-vehicle device is configured to transmit signals from the plurality of transmission antennas
  • the portable device includes a measurement unit that measures received signal strengths of signals transmitted from the plurality of transmission antennas, A transmission unit that transmits a response signal including the received signal strength of each signal measured by the measurement unit, the in-vehicle device receiving the response signal transmitted from the portable device, and the in-vehicle reception A region inside / outside determination unit that determines whether or not the portable device is inside each of a plurality of different regions including a vehicle interior space based on a received signal strength included in a response signal received by the unit And the structure provided with the determination part which determines whether the said portable machine exists inside the whole area
  • region is preferable.
  • the vehicle-mounted device transmits signals from a plurality of transmission antennas provided in the vehicle.
  • This signal is a signal for determining whether or not the portable device is in the passenger compartment.
  • the portable device receives a signal transmitted from each transmission antenna, measures the received signal strength of each signal, and transmits a response signal including the received signal strength obtained by the measurement to the in-vehicle device.
  • the received signal strength of each signal varies depending on the position of the portable device with respect to the vehicle.
  • the in-vehicle device receives the response signal transmitted from the portable device.
  • the in-region / out-of-region determination unit of the in-vehicle device determines, for each region, whether the portable device is inside each of a plurality of different regions.
  • the determination by the area internal / external determination unit is referred to as internal / external determination.
  • the plurality of areas include a vehicle interior space, and a part of the boundary of each area accurately follows a part of the boundary of the area to be determined inside / outside, but the boundary of each area is a boundary of the vehicle interior space. It does not match completely. For this reason, the man-hour required for parameter creation for determining whether the portable device is located inside or outside the boundary surface in each region can be reduced.
  • the portable device When the portable device is outside the vehicle interior space, it is determined that the portable device is outside at least one of the plurality of regions.
  • the plurality of areas when all are combined, are created so as to accurately follow the boundary of the area where it is desired to determine whether the portable device is in the passenger compartment. It is possible to accurately determine whether it is located inside or outside.
  • the determination of the position of the portable device by the determination unit is referred to as vehicle interior / exterior determination.
  • the vehicle interior space of this aspect does not need to completely coincide with the vehicle interior space, and does not need to include the entire vehicle interior without omission.
  • An in-vehicle device transmits a signal from one or a plurality of transmission antennas provided in a vehicle to the portable device, and the portable device is a vehicle based on a response signal from the portable device. It is an in-vehicle device that determines whether or not the vehicle is indoors, and at least one of the transmission antennas is disposed on a movable portion that is rotatably supported around a shaft portion provided in the vehicle, and has a rod shape
  • the magnetic core and a coil wound around the outer periphery of the magnetic core, and the angle formed by the shaft portion and the magnetic core is 0 degree or more and 45 degrees or less.
  • FIG. 1 is a block diagram illustrating a configuration example of a vehicle communication system according to an embodiment.
  • the vehicle communication system according to this embodiment includes a vehicle-mounted device 1 that transmits and receives various signals using a plurality of transmission antennas (3) and a reception antenna 4 provided in the vehicle C, and a signal between the vehicle-mounted device 1. And a portable device 2 for transmitting and receiving.
  • the plurality of transmission antennas (3) are, for example, a first transmission antenna 31 provided in the driver side door mirror 5R, a second transmission antenna 32 provided in the passenger side door mirror 5L, and a first transmission antenna provided in the back door. 3 transmission antennas 33 and a fourth transmission antenna 34 provided at the front of the vehicle C.
  • the receiving antenna 4 is provided at an appropriate location of the vehicle C.
  • the right side in the traveling direction of the vehicle C is the driver seat side
  • the left side in the traveling direction is the passenger seat side.
  • the in-vehicle device 1 sequentially transmits signals for determining whether or not the portable device 2 is in the vehicle interior from the plurality of transmission antennas (3) using radio signals.
  • the portable device 2 receives a signal transmitted from each transmission antenna (3), and measures the received signal strength of each received signal.
  • the portable device 2 transmits a response signal including the measured received signal strength to the in-vehicle device 1 using a wireless signal.
  • the in-vehicle device 1 receives the response signal transmitted from the portable device 2, performs a vehicle interior / exterior determination of the portable device 2 based on the received signal strength included in the received response signal, and performs predetermined processing according to the determination result. Execute. For example, the in-vehicle device 1 executes processing such as locking or unlocking of a vehicle door, starting of an engine, warning of forgetting to lock the vehicle door, and the like.
  • FIGS. 2A and 2B are conceptual diagrams showing the arrangement of the first transmission antennas 31.
  • FIG. FIG. 2A shows a state where the door mirror 5R is opened
  • FIG. 2B shows a state where the door mirror 5R is closed. Since the configuration and arrangement of the second transmission antenna 32 are the same as those of the first transmission antenna 31, only the first transmission antenna 31 will be described, and the description of the second transmission antenna 32 will be omitted.
  • the door mirror 5R is movable so as to open and close the vehicle C as shown in FIGS. 2A and 2B.
  • the door mirror 5R includes a movable portion 51 having a mirror surface 5a and a fixed portion 52 that supports the movable portion 51 so as to be rotatable.
  • the fixing portion 52 is provided in the vicinity of the front side of the vehicle door on the driver's seat side, and is formed of a resin such as polyethylene terephthalate.
  • the fixed portion 52 has an upper surface portion on which the movable portion 51 is disposed, and a shaft portion 52a that protrudes substantially vertically upward is provided on the upper surface portion.
  • the shaft portion 52a includes a conductive material.
  • the shaft portion 52a is made of metal.
  • the shaft portion 52a may be made of a non-conductive material and a conductive material.
  • the metal shaft may be covered with resin, or the resin shaft may be covered with metal.
  • the movable part 51 has a housing having an opening on one surface, and a mirror surface 5a is provided so as to cover the opening.
  • the movable portion 51 is rotatably supported by a shaft portion 52a so that the mirror surface 5a faces the rear side or the vehicle body side, and the mirror surface 5a is configured to be adjustable in angle up, down, left and right by a drive motor (not shown).
  • the first transmission antenna 31 is disposed inside the movable portion 51 and in the vicinity of the shaft portion 52a.
  • FIG. 3 is a conceptual diagram showing an example of the configuration of the first transmission antenna 31.
  • the first transmitting antenna 31 includes a rod-shaped magnetic core 31a and a coil 31b wound around the outer periphery of the magnetic core 31a. More specifically, the magnetic core 31a has a substantially prismatic shape with a length of 65 to 110 mm.
  • the magnetic core 31a is inserted into a resin bobbin around which a coil 31b is wound.
  • the magnetic core 31a and the coil 31b configured as described above are accommodated in a rod-like substantially rectangular parallelepiped container (not shown).
  • the container is made of resin.
  • the first transmitting antenna 31 as shown in FIG.
  • the magnetic core 31a is separated from the shaft portion 52a by 1 cm or more and 2 cm or less, and the longitudinal direction of the magnetic core 31a is substantially parallel to the shaft portion 52a. In this posture, it is fixed inside the movable portion 51.
  • “substantially parallel” does not mean that the angle formed by the shaft portion 52a and the magnetic core 31a is strictly 0 degrees, and is about 0 degrees or more and 25 degrees or less, preferably about 0 degrees or more and 20 degrees or less. More preferably, it means about 0 degree or more and 10 degrees or less, more preferably about 0 degree or more and 5 degrees or less.
  • a capacitor (not shown) is connected to the coil 31b to constitute a resonance circuit. Further, if necessary, an electric resistor may be further connected to the capacitor to form a resonance circuit.
  • the resonance circuit is electrically connected to the in-vehicle device 1, and when the resonance circuit resonates in accordance with the electric signal output from the in-vehicle device 1 and a current flows through the coil 31 b, a signal is transmitted from the first transmission antenna 31. Sent. In FIG. 3, a broken line indicates a magnetic force line of a signal transmitted from the first transmission antenna 31.
  • FIG. 4 is a conceptual diagram showing an angle formed by the shaft portion 52a and the magnetic core 31a.
  • the angle ⁇ formed by the shaft portion 52a and the magnetic core 31a is not limited to this, and FIG. As shown in FIG. 4, it may be in the range of 0 degree or more and 45 degrees or less.
  • FIG. 5 is a conceptual diagram showing the distance between the shaft 52a and the magnetic core 31a.
  • the distance R between the magnetic core 31a and the shaft portion 52a is not limited thereto. As shown in FIG. 5, it may be 6 cm or less.
  • the direction in which the first transmission antenna 31 is separated from the shaft portion 52a may be the driver seat side, the passenger seat side, the vehicle front, the vehicle rear, or the like, but is not particularly limited.
  • FIG. 6 is a block diagram illustrating a configuration example of the in-vehicle device 1.
  • the in-vehicle device 1 includes a control unit 11 that controls the operation of each component of the in-vehicle device 1.
  • the control unit 11 is provided with an in-vehicle reception unit 12, an in-vehicle transmission unit 13, a switch 13a, and a storage unit 14.
  • the control unit 11 is a microcomputer having, for example, one or a plurality of CPUs (Central Processing Unit), a multi-core CPU, a ROM (Read Only Memory), a RAM (Random Access Memory), an input / output interface, a timer, and the like.
  • the CPU of the control unit 11 is connected to the in-vehicle receiving unit 12, the in-vehicle transmitting unit 13, and the storage unit 14 through an input / output interface.
  • the control unit 11 controls the operation of each constituent unit by executing a computer program described later stored in the storage unit 14, and performs predetermined processing according to the vehicle interior / exterior determination and the vehicle interior / exterior determination of the portable device 2. Execute.
  • the storage unit 14 is a nonvolatile memory such as an EEPROM (ElectricallyrErasable Programmable ROM) or a flash memory.
  • the storage unit 14 stores a computer program for executing the inside / outside determination of the portable device 2 by the control unit 11 controlling the operation of each component of the in-vehicle device 1.
  • the storage unit 14 stores various statistical values for determining whether the portable device 2 is in or out of the vehicle interior. Details of the statistical value will be described later.
  • the control unit 11 and the storage unit 14 are illustrated as separate components, but the storage unit 14 may be provided inside the control unit 11.
  • the receiving antenna 4 is connected to the in-vehicle receiving unit 12.
  • the in-vehicle receiving unit 12 receives a response signal transmitted wirelessly from the portable device 2 through the receiving antenna 4.
  • the in-vehicle receiving unit 12 is a circuit that removes a carrier wave component from the received response signal or the like, extracts the received signal, and outputs the extracted received signal to the control unit 11.
  • a carrier wave a UHF (Ultra High Frequency) band of 300 MHz to 3 GHz is used, but the carrier wave is not limited to this frequency band.
  • the in-vehicle transmission unit 13 modulates the signal output from the control unit 11 into a radio signal using a carrier wave, and carries the radio signal from one transmission antenna (3) selected by the control unit 11 and the switch 13a. This is a circuit for transmitting to the machine 2.
  • the carrier wave uses an LF (Low Frequency) band of 30 kHz to 300 kHz, but is not limited to this frequency band.
  • the request signal according to the operation state of the vehicle door request switch which is not shown in figure is input into the control part 11 of the vehicle equipment 1.
  • the control unit 11 can recognize the operation state of the vehicle door request switch based on the input request signal.
  • the vehicle door request switch is, for example, a switch for locking or unlocking a vehicle door on the driver's seat side or the passenger seat side, and is provided on a door handle outside the driver seat or outside the passenger seat. In place of the push button, a contact sensor for detecting the contact of the user's hand with the door handle may be provided.
  • the control part 11 may acquire directly the request signal corresponding to operation of a vehicle door request switch, and may acquire via door ECU (Electronic Control Unit), other ECU, etc.
  • the control unit 11 does not show a vehicle door control command for controlling unlocking or locking of the vehicle door according to the operation state of the vehicle door request switch and the situation such as whether or not the portable device is in the vehicle interior. Output to the door ECU.
  • the door ECU locks or unlocks the vehicle door in accordance with a vehicle door control command from the control unit 11. Further, the control unit 11 outputs a warning command to a warning device (not shown) if necessary according to the situation. For example, when the vehicle door request switch is operated with the portable device 2 in the vehicle compartment, the control unit 11 outputs a warning command to the warning device.
  • the warning device gives a predetermined warning to the user of the vehicle using sound or light according to the warning command.
  • an engine start signal corresponding to the operation state of an engine start switch (not shown) is input to the control unit 11 of the in-vehicle device 1.
  • the controller 11 can recognize the operation state of the engine start switch based on the input engine start signal.
  • the control unit 11 outputs an engine control command for starting or stopping the engine to an engine ECU (not shown) according to the operation state of the engine start switch and the situation such as whether or not the portable device 2 is in the passenger compartment. .
  • the engine ECU starts or stops the engine in accordance with an engine control command from the control unit 11.
  • FIG. 7 is a block diagram showing a configuration example of the portable device 2.
  • the portable device 2 includes a control unit 21 that controls the operation of each component of the portable device 2.
  • the control unit 21 includes a transmission unit 22, a reception unit 23, a signal strength measurement unit 23b, a switch 23c, and a storage unit 24.
  • the control unit 21 is a microcomputer having, for example, one or a plurality of CPUs, a multi-core CPU, a ROM, a RAM, an input / output interface, a timer, and the like.
  • the CPU of the control unit 21 is connected to the transmission unit 22, the reception unit 23, and the signal strength measurement unit 23b via an input / output interface.
  • the control unit 21 executes the control program stored in the storage unit 24 to control the operation of each component, and transmits various types of processing necessary for determining whether the portable device 2 is inside or outside the vehicle to the in-vehicle device 1. Execute.
  • the storage unit 24 is a non-volatile memory similar to the storage unit 14.
  • the storage unit 24 stores a control program for determining whether the portable device 2 is inside or outside the vehicle by controlling the operation of each component of the portable device 2. According to the control program, the control unit 21 executes a process of transmitting a response signal including information necessary for vehicle interior / exterior determination to the in-vehicle device 1.
  • the storage unit 24 stores a portable device identifier for identifying the portable device 2. In FIG. 7, the control unit 21 and the storage unit 24 are illustrated as separate components, but the storage unit 24 may be provided inside the control unit 21.
  • the receiving unit 23 is connected to a three-axis antenna 23a in which three coils 31b are arranged in directions orthogonal to each other via a switch 23c.
  • the receiving unit 23 receives a radio signal transmitted from the in-vehicle device 1 through the three-axis antenna 23a and the switch 23c. Three radio signals received by the three-axis antenna 23a are input to the switch 23c.
  • the switch 23 c selects one radio signal according to the control of the control unit 21.
  • the receiving unit 23 is a circuit that removes a carrier wave component from the radio signal selected by the switch 23c, extracts the received signal, and outputs the extracted received signal to the control unit 21.
  • the carrier wave uses the LF band of 30 kHz to 300 kHz, but is not limited to this frequency band.
  • the portable device 2 receives a radio signal transmitted from the vehicle-mounted device 1 through the three-axis antenna 23a, measures the received signal strength of the radio signal selected by the switch 23c, and controls the measured received signal strength to the control unit 21.
  • the signal strength measuring unit 23b that outputs to The control unit 21 selects each of the three radio signals from the triaxial antenna 23a in accordance with the timing at which the radio signal for signal strength measurement is transmitted from the in-vehicle device 1, and signals the received signal strength of the selected radio signal. It measures by the intensity
  • the control unit 21 measures not the received signal strength in the amplitude direction of the radio signal transmitted from the in-vehicle device 1 but the received signal strength components in the three orthogonal directions of the three-axis antenna 23a.
  • the control unit 21 performs vector calculation from the measured received signal strength component, and calculates the received signal strength in the amplitude direction of the radio signal transmitted from the in-vehicle device 1. Therefore, the control unit 21 can obtain a constant received signal strength regardless of the orientation or posture of the portable device 2 with respect to the vehicle C.
  • the received signal strength calculated by vector calculation is referred to as received signal strength.
  • the control part 21 calculates received signal strength.
  • the transmission unit 22 is a circuit that modulates the response signal or the like input by the control unit 21 using a carrier wave and transmits a radio signal through the transmission antenna 22a.
  • the carrier wave uses a UHF band of 300 MHz to 3 GHz, but is not limited to this frequency band.
  • storage part 14 memorize
  • the storage unit 14 stores statistical values defining the first area, the second area, the third area, and the fourth area as four areas.
  • FIG. 8 is a conceptual diagram showing a region corresponding to the vehicle interior space.
  • a hatched range is a region corresponding to the vehicle interior space.
  • the vehicle interior space is a space in which the portable device 2 can be placed by a user in the vehicle interior, for example.
  • the first region to the fourth region 61, 62, 63, 64 include a vehicle interior space, and the boundary surfaces of the first region to the fourth region 61, 62, 63, 64 are the right side surface and the left side of the vehicle interior, respectively. Since it follows the surface, the rear surface, and the front surface, the spaces inside all of the first to fourth regions 61, 62, 63, 64 substantially coincide with the vehicle interior space.
  • FIG. 9A and 9B are conceptual diagrams showing the first region 61.
  • FIG. 9A is a plan view of the first region 61
  • FIG. 9B is an elevation view of the first region 61.
  • the first region 61 is a three-dimensional space, has a boundary surface that follows the right inner surface of the vehicle compartment, as shown in FIG. 9, and includes a vehicle interior space. Therefore, the first region 61 also includes the left side wall, the rear wall, and the windshield portion that constitute the passenger compartment. In FIG. 9, the hatched portion is the vehicle interior space.
  • the boundary surface of the first region 61 and the inner side surface of the passenger compartment do not completely coincide, even if the inside / outside determination of the portable device 2 in the first region 61 is performed, the inside / outside determination of the portable device 2 is performed. It cannot be done accurately. However, since at least a part of the boundary surface of the first region 61 substantially coincides with the right inner surface of the passenger compartment, the portable device 2 can be used only when the portable device 2 is near the right side wall of the vehicle C. Car interior / exterior determination can be performed with high accuracy.
  • FIG. 10A and FIG. 10B are conceptual diagrams showing sample extraction locations related to the first region 61.
  • the statistical value defining the first region 61 is calculated in the manufacturing process of the vehicle communication system, and the storage unit 14 stores the calculated statistical value.
  • the statistical value is calculated based on the sample value of the received signal strength measured by the portable device 2 that has received each signal transmitted from the plurality of transmitting antennas (3).
  • the device for measuring the sample value of the received signal strength is not necessarily the portable device 2, and is not particularly limited as long as it is a measuring device that can measure the signal strength corresponding to the received signal strength measured by the portable device 2. It is never done.
  • the sample value of the received signal strength is obtained by placing the portable device 2 at a specific location inside or outside the vehicle C and measuring the received signal strength.
  • a set of received signal strengths measured at a plurality of locations is referred to as a sample group.
  • the storage unit 14 uses, as statistical values defining the first region 61, a first statistical value based on a sample group that characterizes the inside of the first region 61, and a second statistical value that is based on a sample group that characterizes the outside of the first region 61;
  • FIG. 10A shows an arrangement of the portable device 2 for obtaining a sample value from which the first statistical value is calculated.
  • the portable device 2 is arranged at a plurality of locations along the vehicle interior side on the right side surface of the vehicle compartment, and the received signal strength of the signal received by the portable device 2 is measured at each location. Then, a first statistical value is calculated based on the measured sample value of the received signal strength.
  • a broken ellipse indicates a place where the portable device 2 is to be placed. Since there are four transmission antennas (3) in the present embodiment, the received signal strength measured by the portable device 2 at one location is four. Accordingly, the received signal strength samples obtained at each location are vector quantities, and the sample group is a group of samples that are vectors. A vector having four received signal strengths as components is called a received signal strength vector.
  • the first statistical value is, for example, the average vector and inverse variance covariance matrix of the sample group that characterizes the inside of the first region 61.
  • the average vector of the sample group is expressed by the following formulas (1) and (2).
  • a black circle shown in FIG. 10A indicates a conceptual position of the average vector.
  • the variance-covariance matrix of the sample group characterizing the inside of the first region 61 is expressed by the following equations (3) and (4).
  • the inverse variance / covariance matrix is an inverse matrix of the variance / covariance matrix expressed by the following equation (3), and the storage unit 14 stores the inverse variance / covariance matrix.
  • FIG. 10B shows an arrangement of the portable device 2 for obtaining a sample value from which the second statistical value is calculated.
  • the portable device 2 is arranged at a plurality of locations along the vehicle compartment outside on the right side surface of the vehicle compartment, and the received signal strength of the signal received by the portable device 2 is measured at each location. Then, a second statistical value is calculated based on the measured sample value of the received signal strength.
  • the second statistical value is the average vector and inverse variance covariance matrix of the sample group that characterizes the outside of the first region 61.
  • the mean vector and inverse variance covariance matrix, which are the second statistical values, are expressed by the above formulas (1) to (4), similarly to the first statistical value.
  • a black circle shown in FIG. 10B indicates a conceptual position of the average vector of the sample group.
  • the storage unit 14 also uses the second region 62, the third region 63, and the fourth region 64 as statistical values that define the respective regions for the second region 62, the third region 63, and the fourth region 64.
  • the second to fourth regions 62, 63, and 64 are three-dimensional spaces.
  • the second region 62 has a boundary surface that follows the left side surface of the vehicle compartment, and has a shape that encompasses the vehicle interior space.
  • the third region 63 has a boundary surface that follows the rear inner surface of the passenger compartment, and has a shape that encompasses the entire interior space of the passenger compartment.
  • the fourth region 64 has a boundary surface that follows the inner surface on the front side of the passenger compartment, and has a shape that encompasses the entire vehicle interior space.
  • FIG. 11 is a flowchart showing a processing procedure for an operation request.
  • the operation request is, for example, a request for locking or unlocking a vehicle door by operating a vehicle door request switch, a request for starting or stopping an engine by operating an engine start switch, and the like.
  • a request signal corresponding to the operation of the vehicle door request switch is input to the in-vehicle device 1
  • an engine start signal corresponding to the operation of the engine start switch is input to the in-vehicle device 1 starts processing. .
  • the control unit 11 of the in-vehicle device 1 causes the in-vehicle transmission unit 13 to transmit a wakeup signal from the transmission antenna (3) (step S101).
  • the control unit 21 of the portable device 2 that has received the wake-up signal by the receiving unit 23 starts from the sleep state to the active state, and transmits its own portable device identifier to the in-vehicle device 1 by the transmission unit 22 (step S102). .
  • the control unit 11 of the in-vehicle device 1 receives the portable device identifier transmitted from the portable device 2 by the in-vehicle receiving unit 12. And the control part 11 produces the data for authentication using the received portable device identifier, and transmits the challenge signal containing this data from the transmission antenna (3) by the vehicle-mounted transmission part 13 (step S103).
  • control unit 21 When the control unit 21 receives the challenge signal at the reception unit 23, confirms the validity of the in-vehicle device 1 using data included in the received challenge signal, and confirms that the in-vehicle device 1 is valid, The in-vehicle device 1 creates data for authenticating the portable device 2, and transmits a response signal including the data to the in-vehicle device 1 by the transmission unit 22 (step S104).
  • the control unit 11 of the in-vehicle device 1 receives the response signal transmitted from the portable device 2 by the in-vehicle reception unit 12, and authenticates the portable device 2 using the data included in the received response signal (step S105). . If it is determined that the authentication is successful (step S105: YES), the control unit 11 executes a subroutine for determining whether the portable device 2 is inside or outside the vehicle (step S106). That is, the control unit 11 determines whether the portable device 2 is in the vehicle interior or outside the vehicle interior.
  • the result of the vehicle interior / exterior determination is represented by a numerical value. For example, when the portable device 2 is in the vehicle interior, the numerical value of the vehicle interior / exterior determination result is 1, and when the mobile device 2 is outside the vehicle interior, the numerical value of the vehicle interior / exterior determination result is 0.
  • control unit 11 determines whether or not the result of the vehicle interior / exterior determination matches the expected value determined in advance according to the content of the operation request (step S107). For example, the expected value for the operation of unlocking the vehicle door by the operation of the vehicle door request switch is 0, and the expected value for the operation of starting the engine is 1.
  • step S107 If it is determined that the result of the vehicle interior / exterior determination matches the expected value (step S107: YES), the control unit 11 receives the operation request and executes a process according to the operation request (step S108). ) Finish the process. For example, when an operation of the vehicle door request switch is performed, a process of outputting a vehicle door control signal for instructing locking or unlocking of the vehicle door to the door ECU is executed. When the engine start switch is operated, a process of outputting an engine control command for starting or stopping the engine to the engine ECU is executed.
  • step S107: NO When it is determined that the vehicle interior / exterior determination result does not match the expected value (step S107: NO), or when it is determined that authentication of the portable device 2 has failed (step S105: NO), the control unit 11 Rejects the operation request, executes a process related to the request rejection (step S109), and finishes the process.
  • the process related to request rejection is, for example, a process of generating a warning sound when the engine start switch operation is performed and the portable device 2 is not in the passenger compartment. Note that the processing related to request rejection is not essential.
  • FIG. 12 is a flowchart showing a processing procedure of a vehicle interior / exterior determination subroutine in the embodiment.
  • the control unit 11 of the in-vehicle device 1 causes the in-vehicle transmission unit 13 to sequentially transmit a signal for measuring the received signal strength for the vehicle interior / exterior determination from each of the plurality of transmission antennas (3) (step S111).
  • the control unit 21 of the portable device 2 receives the signal transmitted from each transmission antenna (3) by the reception unit 23, and acquires the received signal strength of each signal measured by the signal strength measurement unit 23b. And the control part 21 transmits the response signal containing the measured received signal strength to the vehicle equipment 1 in the transmission part 22.
  • the control unit 11 of the in-vehicle device 1 receives the response signal transmitted from the portable device 2 by the in-vehicle reception unit 12 (step S112). Next, based on the received signal strength included in the response signal received by the in-vehicle receiving unit 12, the control unit 11 has the portable device 2 inside each of the first to fourth regions 61, 62, 63, 64. Whether or not each area is determined is executed in steps S113 to S118. The processes in steps S113 to S118 are executed for each of the first to fourth areas 61, 62, 63, and 64. The process related to the first area 61 will be mainly described as a representative example.
  • the control unit 11 reads out the statistical value of one of the first to fourth regions 61, 62, 63, and 64, that is, the first statistical value and the second statistical value from the storage unit 14 (step S113). For example, the control unit 11 reads the first statistical value and the second statistical value of the first region 61 from the storage unit 14.
  • control part 11 is based on the received signal intensity
  • the control unit 11 calculates the statistical distance between the received signal strength included in the response signal and the sample group that characterizes the inside of the first region 61.
  • the statistical distance is, for example, the Mahalanobis distance.
  • the Mahalanobis distance is expressed by the following formula (5).
  • control unit 11 determines the received signal strength and the sample group related to the second statistical value based on the received signal strength included in the response signal received in step S112 and the second statistical value read in step S113. Is calculated (step S115).
  • the control unit 11 calculates the statistical distance between the received signal strength included in the response signal and the sample group that characterizes the outside of the first region 61.
  • the statistical distance is, for example, the Mahalanobis distance.
  • control part 11 determines whether the portable device 2 exists inside the said one area
  • step S116: NO the control unit 11 determines that the portable device 2 is outside the passenger compartment (step S117) and ends the subroutine processing.
  • step S116: YES the control part 11 determines whether the inside / outside determination of the portable device 2 in all the areas was complete
  • step S118 If it is determined that there is an area where the inside / outside determination of the portable device 2 has not ended (step S118: NO), the control unit 11 returns the process to step S113, and the portable device 2 in another region where the inside / outside determination is not performed. The inside / outside determination process is executed.
  • step S118 determines that the inside / outside determination of the portable device 2 in all areas has been completed (step S118: YES) and ends the subroutine processing.
  • FIG. 13A and 13B are conceptual diagrams illustrating the arrangement of the first transmission antennas 31 according to the comparative example.
  • FIG. 13A shows a state in which the door mirror 5R is opened
  • FIG. 13B shows a state in which the door mirror 5R is closed.
  • the first transmitting antenna 31 in the comparative example is fixed inside the movable portion 51 so that the magnetic core 31a is substantially perpendicular to the shaft portion 52a.
  • FIG. 14A and 14B are graphs showing the relationship between the rotation position of the movable portion 51 and the received signal strength.
  • FIG. 14A shows received signal strength when the portable device 2 receives a signal transmitted from the first transmitting antenna 31 in which the magnetic core 31a is arranged substantially perpendicular to the shaft portion 52a.
  • the horizontal axis shows the separation distance of the portable device 2 in the vertical direction from the vehicle side surface with reference to the position 60 cm behind the vehicle door request switch on the driver's seat side.
  • 0 is the position of the boundary between the passenger compartment and the passenger compartment.
  • the outer side in the vertical direction (the direction outside the passenger compartment) is positive with respect to the side surface of the vehicle C, and the inner side in the vertical direction (the direction in the passenger compartment) is negative.
  • the vertical axis represents the received signal strength measured by the portable device 2 receiving the signal transmitted from the first transmitting antenna 31.
  • the bold line graph shows the received signal strength measured by the portable device 2 with the door mirror 5R opened
  • the broken line graph shows the received signal strength measured by the portable device 2 with the door mirror 5R closed.
  • FIG. 14B shows received signal strength when the portable device 2 receives a signal transmitted from the first transmitting antenna 31 in which the magnetic core 31a is arranged substantially parallel to the shaft portion 52a.
  • the bold line graph shows the received signal strength measured by the portable device 2 with the door mirror 5R opened
  • the broken line graph shows the received signal strength measured by the portable device 2 with the door mirror 5R closed. Is shown.
  • the magnetic core 31a is arranged substantially parallel to the shaft portion 52a, it is measured by the portable device 2 regardless of the open / closed state of the door mirror 5R, that is, the rotational position of the movable portion 51, as shown in FIG. 14B.
  • the received signal strength is almost unchanged.
  • FIGS. 15A and 15B are graphs showing determination errors when the first transmission antenna 31 according to the comparative example is used.
  • FIGS. 15A and 15B show determination errors that occur when the inside / outside determination of the first region 61 is performed using the first transmitting antenna 31 in which the magnetic core 31a is disposed substantially perpendicular to the shaft portion 52a.
  • storage part 14 shall memorize
  • FIG. 15A shows a determination error that occurs when the inside / outside determination of the first region 61 is performed with the door mirror 5R opened.
  • the horizontal axis indicates the distance in the front-rear direction of the vehicle C with reference to the position of the vehicle door request switch on the driver's seat side. The front of the vehicle is positive and the rear of the vehicle is negative. 0 on the horizontal axis is the position of the vehicle door request switch.
  • the vertical axis represents the position of the portable device 2 that is erroneously determined to be in the first region 61 (vehicle compartment) even though the portable device 2 is outside the first region 61 (outside the vehicle compartment), specifically the vehicle. The distance in the vertical outside direction with respect to the side surface of C is shown. 0 on the vertical axis is the position of the boundary between the vehicle interior and the exterior of the vehicle interior. In the example shown in FIG. 15A, the range where the determination error occurs is within a predetermined distance from the side surface of the vehicle C.
  • FIG. 15B shows a determination error that occurs when the inside / outside determination of the first region 61 is performed with the door mirror 5R closed.
  • the vertical axis represents the position of the portable device 2 that is erroneously determined to be outside the first region 61 (outside the vehicle compartment) even though the portable device 2 is inside the first region 61 (vehicle interior), specifically the vehicle.
  • the distance in the vertical inner direction from the side surface is shown.
  • the distance in the vertical inner direction is negative.
  • the range in which the determination error occurs exceeds a predetermined distance from the side surface of the vehicle C.
  • the movable part 51 of the door mirror 5R rotates to increase the error of the inside / outside determination of the first region 61. As a result, whether or not the portable device 2 is in the vehicle interior. Judgment errors also become large.
  • FIG. 16 is a graph showing a determination error when the first transmission antenna 31 according to the present embodiment is used.
  • FIG. 16 shows a determination error that occurs when the inside / outside determination of the first region 61 is performed using the first transmitting antenna 31 in which the magnetic core 31a is arranged substantially parallel to the shaft portion 52a.
  • storage part 14 shall memorize
  • the contents indicated by the horizontal and vertical axes are the same as those in FIGS. 15A and 15B.
  • the range in which the determination error occurs is almost unchanged regardless of the open / closed state of the door mirror 5R, that is, the rotational position of the movable portion 51.
  • the determination error as to whether or not the portable device 2 is in the vehicle interior is substantially unchanged regardless of the rotational position of the movable portion 51, and the determination error occurs only in a certain range outside the vehicle C.
  • the portable device 2 that has been misplaced in the vehicle interior or a suspicious person who does not have the portable device 2 is stored. This causes a problem that the vehicle door is unlocked from the outside.
  • the region where the determination error occurs is limited to a limited range outside the passenger compartment, and even if the door mirror 5R rotates, the region where the determination error occurs extends into the passenger compartment. No.
  • FIG. 17 is a graph showing the relationship between the angle formed by the shaft portion 52a and the magnetic core 31a and the received signal strength.
  • the horizontal axis indicates the angle
  • the vertical axis indicates the received signal intensity measured by the portable device 2 receiving and measuring the signal transmitted from the first transmitting antenna 31 with the door mirror 5R open, and the door mirror 5R closed. The difference between the received signal strength and the received signal strength is shown.
  • the distance between the shaft 52a and the center of the magnetic core 31a is about 1 cm.
  • a graph plotted with a circle indicates a difference in received signal strength obtained by measurement at a position approximately 50 cm vertically outward (in the vehicle compartment direction) from the vehicle side surface.
  • the graph plotted with rhombuses indicates a difference in received signal strength obtained by measurement at a position approximately 35 cm in the vertical direction inner side (vehicle interior direction) from the vehicle side surface.
  • the angle formed by the shaft 52 a and the magnetic core 31 a is in the range of 0 ° to 45 °, the difference in the received signal strength outside the vehicle compartment is reduced. Can be suppressed.
  • the angle is about 0 degree or more and 25 degrees or less, the difference in received signal strength both outside the vehicle compartment and inside the vehicle compartment can be kept low. If it is about 0 degree or more and 20 degrees or less, the difference of the received signal strength in a vehicle interior can be suppressed more low.
  • the difference of the received signal strength in a vehicle interior can be suppressed further low. If it is about 0 degree or more and 5 degrees or less, the difference of the received signal strength in a vehicle interior can be suppressed still further.
  • the graph of FIG. 17 is the result when the distance between the center of the shaft 52a and the magnetic core 31a is about 1 cm, but at least the distance between the center of the shaft 52a and the magnetic core 31a is 1 cm or more. The same applies even if it is 2 cm or less.
  • FIG. 18 is a graph showing the relationship between the distance between the shaft portion 52a and the magnetic core 31a and the received signal strength.
  • the horizontal axis indicates the distance between the center of the shaft portion 52a and the center of the magnetic core 31a, and the vertical axis indicates the signal transmitted from the first transmitting antenna 31 when the door mirror 5R is opened and measured by the portable device 2.
  • the difference between the received signal strength and the received signal strength of the signal transmitted with the door mirror 5R closed is shown.
  • a graph plotted with a circle indicates a difference in received signal strength obtained by measurement at a position approximately 50 cm vertically outward (in the vehicle compartment direction) from the vehicle side surface.
  • the graph plotted with rhombuses indicates a difference in received signal strength obtained by measurement at a position approximately 35 cm in the vertical direction inner side (vehicle interior direction) from the vehicle side surface. In the range where the distance between the shaft portion 52a and the magnetic core 31a is 6 cm or less, even if the portable device 2 is located inside the vehicle compartment or outside the vehicle compartment, the difference in received signal strength due to the opening / closing of the door mirror 5R It can be kept low.
  • the first transmission antenna 31 that transmits a signal for determining whether or not the portable device 2 is in the vehicle interior is the door mirror 5R. Even in the case where the movable unit 51 is disposed, it can be accurately determined whether or not the portable device 2 is in the vehicle interior, regardless of the rotational position of the movable unit 51.
  • the first transmission antenna 31 is separated from the shaft portion 52a containing the conductive material, and the distance between the magnetic core 31a and the shaft portion 52a is 6 cm or less. Therefore, attenuation of the signal transmitted from the first transmission antenna 31 at the shaft portion 52a can be suppressed, and a change in the magnetic field distribution of the signal due to the rotation of the movable portion 51 can also be suppressed.
  • the first to fourth regions 61, 62, 63, 64 have a boundary surface that follows a part of the inner side surface of the passenger compartment. Accordingly, by performing the inside / outside determination of the portable device 2 in the first region to the fourth region 61, 62, 63, 64, the vehicle interior / exterior determination in the part of the vehicle interior can be performed with high accuracy.
  • the example in which the vehicle interior / exterior determination is performed using the first to fourth regions 61, 62, 63, 64 has been described.
  • the present invention is not limited to this embodiment.
  • the inside / outside determination of the portable device 2 may be performed using the two regions of the second region 62.
  • the vehicle interior / exterior determination of the portable device 2 may be performed using the three areas of the first area to the third areas 61, 62, and 63. Furthermore, the inside / outside determination of the portable device 2 is performed using two or three regions arbitrarily selected from the first to fourth regions 61, 62, 63, 64, or five or more regions not shown. May be.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Lock And Its Accessories (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)

Abstract

La présente invention concerne un système de communication pour véhicule qui est pourvu d'un dispositif monté sur véhicule qui envoie un signal depuis plusieurs antennes disposées sur un véhicule et d'un dispositif mobile qui reçoit le signal transmis par ledit dispositif monté sur véhicule et envoie un signal de réponse en réponse au signal reçu. Le dispositif monté sur véhicule reçoit le signal de réponse transmis par le dispositif mobile et, sur la base du signal de réponse reçu, détermine si le dispositif mobile se trouve ou non à l'intérieur de l'habitacle du véhicule. Au moins une antenne est disposée sur une partie mobile supportée de manière à pouvoir tourner autour d'un arbre disposé dans le véhicule et présente un noyau magnétique en forme de tige et une bobine enroulée autour de la périphérie extérieure dudit noyau magnétique, la direction longitudinale du noyau magnétique étant approximativement parallèle à l'arbre.
PCT/JP2016/080795 2015-10-21 2016-10-18 Système de communication pour véhicule et dispositif monté sur véhicule WO2017069108A1 (fr)

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JP2015207268A JP2017078310A (ja) 2015-10-21 2015-10-21 車両用通信システム及び車載機

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Cited By (1)

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CN109698401A (zh) * 2017-10-23 2019-04-30 普莱默公司 用于车辆环境内的低频通信的天线及低频通信系统

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JP2019165327A (ja) * 2018-03-19 2019-09-26 株式会社オートネットワーク技術研究所 車載装置、送信方法及びコンピュータプログラム

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JPH11321471A (ja) * 1998-05-08 1999-11-24 Tokai Rika Co Ltd 車両用通信装置
JP2000091741A (ja) * 1998-09-08 2000-03-31 Dainippon Printing Co Ltd 転写用部材の製造方法及び転写用部材
JP2007205004A (ja) * 2006-02-01 2007-08-16 Alps Electric Co Ltd キーレスエントリー装置

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JP2000091841A (ja) * 1998-09-07 2000-03-31 Maspro Denkoh Corp 無指向性アンテナ

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Publication number Priority date Publication date Assignee Title
JPH11321471A (ja) * 1998-05-08 1999-11-24 Tokai Rika Co Ltd 車両用通信装置
JP2000091741A (ja) * 1998-09-08 2000-03-31 Dainippon Printing Co Ltd 転写用部材の製造方法及び転写用部材
JP2007205004A (ja) * 2006-02-01 2007-08-16 Alps Electric Co Ltd キーレスエントリー装置

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Publication number Priority date Publication date Assignee Title
CN109698401A (zh) * 2017-10-23 2019-04-30 普莱默公司 用于车辆环境内的低频通信的天线及低频通信系统

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