WO2018047748A1 - Vehicle-mounted communication system, vehicle-mounted device and portable apparatus - Google Patents

Vehicle-mounted communication system, vehicle-mounted device and portable apparatus Download PDF

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Publication number
WO2018047748A1
WO2018047748A1 PCT/JP2017/031685 JP2017031685W WO2018047748A1 WO 2018047748 A1 WO2018047748 A1 WO 2018047748A1 JP 2017031685 W JP2017031685 W JP 2017031685W WO 2018047748 A1 WO2018047748 A1 WO 2018047748A1
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WIPO (PCT)
Prior art keywords
vehicle
portable device
signal
unit
received
Prior art date
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PCT/JP2017/031685
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French (fr)
Japanese (ja)
Inventor
大輔 宮脇
Original Assignee
株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
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Application filed by 株式会社オートネットワーク技術研究所, 住友電装株式会社, 住友電気工業株式会社 filed Critical 株式会社オートネットワーク技術研究所
Publication of WO2018047748A1 publication Critical patent/WO2018047748A1/en

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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3822—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving specially adapted for use in vehicles

Definitions

  • the present invention relates to an in-vehicle communication system, an in-vehicle device, and a portable device.
  • This application claims priority based on Japanese Patent Application No. 2016-174880 filed on Sep. 7, 2016, and incorporates all the description content described in the above Japanese application.
  • a keyless entry system and a smart entry system have been put to practical use as door lock systems that can lock and unlock a vehicle door without using a mechanical key.
  • a keyless entry system when an occupant performs an operation on an operation unit (a lock button or an unlock button) provided in a portable device, a control signal is transmitted from the portable device to the in-vehicle device, and the in-vehicle device that has received the control signal Thus, locking or unlocking of the vehicle door is controlled.
  • an operation unit a lock button or an unlock button
  • the smart entry system when an occupant carrying a portable device operates a request switch provided on the door handle of the vehicle, wireless communication is performed between the portable device and the in-vehicle device, and the vehicle door is Control related to locking or unlocking is performed.
  • the position of the portable device is determined when the vehicle door is opened and closed, and if the portable device exists in the vehicle, the engine is permitted to start. In addition, after a certain time (for example, 30 seconds) has elapsed since the engine was started, the portable device is searched, and if the portable device is not detected in the vehicle, a notification sound or a notification is displayed on the vehicle display to inform the driver of the portable device.
  • a certain time for example, 30 seconds
  • the position of the portable device may be erroneously determined.
  • the present invention has been made in view of such circumstances, and in-vehicle communication capable of removing environmental noise from a detection signal received by a portable device without periodically measuring the environmental noise by the portable device.
  • An object is to provide a system, an in-vehicle device, and a portable device.
  • An in-vehicle communication system includes an in-vehicle device mounted on a vehicle and a portable device capable of wireless communication with the in-vehicle device, and wireless communication between the in-vehicle device and the portable device.
  • the vehicle-mounted communication system detects the position of the portable device by the vehicle-mounted device, and the vehicle-mounted device alternately transmits two types of detection signals whose phases are different from each other by 180 degrees.
  • an on-vehicle side receiving unit that receives a response signal transmitted from the portable device in response to the detection signal transmitted by the on-vehicle side transmitting unit, and the portable device based on the response signal received by the on-vehicle side receiving unit.
  • a position detection unit that detects the position of the machine, and the portable device receives the two types of detection signals transmitted from the in-vehicle side transmission unit, and the received two types of detection signals.
  • Subtraction to subtract one from the other Including a calculation unit that calculates the signal strength of the detection signal received by the portable device-side reception unit based on the signal obtained by subtraction by the subtraction unit, and information on the signal strength calculated by the calculation unit
  • An in-vehicle device is an in-vehicle device that detects the position of the portable device by performing wireless communication with the portable device, and receives two types of detection signals that are 180 degrees out of phase with each other.
  • a transmitter that alternately transmits, a receiver that receives a response signal transmitted from the portable device with respect to the detection signal transmitted by the transmitter, and the portable device based on the response signal received by the receiver
  • a position detector for detecting the position of the machine.
  • a portable device is a portable device that performs wireless communication with an in-vehicle device, and a reception unit that receives two types of detection signals that are alternately transmitted from the in-vehicle device and that are 180 degrees out of phase with each other.
  • a subtractor that subtracts one of the two types of received detection signals from the other;
  • a calculator that calculates the signal strength of the detection signal received by the receiver based on a signal obtained by subtraction by the subtractor;
  • a transmission unit that transmits a response signal including information on the signal strength calculated by the calculation unit.
  • Embodiments of the present invention will be listed and described. Moreover, you may combine arbitrarily at least one part of embodiment described below.
  • An in-vehicle communication system includes an in-vehicle device mounted on a vehicle and a portable device capable of wireless communication with the in-vehicle device, and performs wireless communication between the in-vehicle device and the portable device.
  • An in-vehicle communication system that detects the position of the portable device by the in-vehicle device, wherein the in-vehicle device alternately transmits two types of detection signals that are 180 degrees out of phase with each other.
  • An in-vehicle side receiving unit that receives a response signal transmitted from the portable device in response to the detection signal transmitted by the in-vehicle side transmitting unit, and the portable device based on the response signal received by the in-vehicle side receiving unit
  • a position detection unit that detects the position of the mobile device, wherein the portable device receives the two types of detection signals transmitted from the in-vehicle side transmission unit, and one of the two types of received detection signals
  • Subtractor that subtracts the other from A calculation unit for calculating the signal strength of the detection signal received by the portable device-side receiving unit based on the signal obtained by subtraction by the subtraction unit, and a response signal including information on the signal strength calculated by the calculation unit
  • a portable device side transmission unit that receives a response signal transmitted from the portable device in response to the detection signal transmitted by the in-vehicle side transmitting unit, and the portable device based on the response signal received by the in-vehicle side receiving unit
  • a position detection unit that detects the position
  • the in-vehicle-side transmission unit includes a phase inverter that changes the phase of a signal to be transmitted by 180 degrees, a path that passes through the phase inverter, and the phase inverter. And a switch for switching a route not to be performed at a predetermined cycle.
  • An in-vehicle device is an in-vehicle device that detects the position of the portable device by performing wireless communication with the portable device, and alternately detects two types of detection signals that are 180 degrees out of phase with each other. Based on the response signal received by the receiving unit, the receiving unit that receives the response signal transmitted from the portable device with respect to the detection signal transmitted by the transmitting unit, And a position detecting unit for detecting the position of.
  • a portable device is a portable device that performs wireless communication with an in-vehicle device, and a reception unit that receives two types of detection signals that are alternately transmitted from the in-vehicle device and that are 180 degrees out of phase with each other; A subtractor for subtracting the other from one of the two types of detection signals received, a calculator for calculating the signal strength of the detection signal received by the receiver based on a signal obtained by subtraction by the subtractor; A transmission unit that transmits a response signal including information on the signal strength calculated by the calculation unit.
  • the detection signal when the detection signal is transmitted from the in-vehicle device on the transmission side, two types of detection signals whose phases are different from each other by 180 degrees are transmitted, and the received portable device receives the two types of detection signals. Subtract one from the other. Therefore, environmental noise that does not have a specific phase relationship such as the same phase or opposite phase as the phase of the detection signal can be reduced on the portable device side, and the signal strength of the received detection signal is accurately measured. be able to. In addition, by returning a response signal including the signal strength measured on the portable device side to the in-vehicle device, the in-vehicle device can accurately detect the position of the portable device.
  • FIG. 1 is a schematic diagram illustrating a schematic configuration of an in-vehicle control system according to the present embodiment.
  • the in-vehicle control system according to the present embodiment includes, for example, an in-vehicle device 100 mounted on a vehicle C and a portable device 200 operated by an occupant.
  • the in-vehicle device 100 is one of a plurality of ECUs (Electronic Controllers Units) mounted on the vehicle, and includes, for example, control related to locking and unlocking a vehicle door, an air conditioner, in-and-out lights, a body This is a so-called BCM (Body Control Module) that performs integrated control related to the operation of the system actuators.
  • ECUs Electronic Controllers Units
  • BCM Body Control Module
  • the in-vehicle device 100 includes an RF reception antenna 105a and a plurality of LF transmission antennas 106a to 106e in order to perform wireless communication with the portable device 200.
  • the RF receiving antenna 105a is an antenna built in the in-vehicle device 100, for example, and receives a signal having an RF band frequency (hereinafter also referred to as an RF signal).
  • the LF transmission antennas 106a to 106e are antennas provided around each vehicle door provided in the vehicle C, for example, and transmit a signal having an LF band frequency (hereinafter also referred to as an LF signal).
  • the LF transmission antennas 106a to 106e are provided, for example, in the vicinity of the vehicle door for the driver seat, the passenger seat, the right rear seat, the left rear seat, and the rear door.
  • the portable device 200 includes an unlock button 203a and a lock button 203b in order to accept operations related to unlocking and locking of the vehicle door.
  • the portable device 200 includes an RF transmission unit 204 and an LF reception unit 205 in order to perform wireless communication with the in-vehicle device 100 mounted on the vehicle C (see FIG. 3).
  • the portable device 200 receives an operation related to unlocking or locking the vehicle door by the unlock button 203a or the lock button 203b, the portable device 200 transmits a signal instructing unlocking or locking of the vehicle door from the RF transmission unit 204. Is possible.
  • the communication range of the wireless communication using the LF signal is about 1 m, while the communication range of the wireless communication using the RF signal is about several tens of meters.
  • the communication range of the wireless communication using the RF signal is about several tens of meters.
  • the portable device 200 when the portable device 200 is not present in the communication ranges Ra to Re by the LF transmitting antennas 106a to 106e, when the operation signal instructing the unlocking of the vehicle door is received from the portable device 200, the in-vehicle device 100 performs a specific operation. Control to unlock the door may be performed.
  • FIG. 2 is a block diagram illustrating the internal configuration of the in-vehicle device 100.
  • the in-vehicle device 100 includes a control unit 101, a storage unit 102, an input / output unit 103, an in-vehicle communication unit 104, an RF reception unit 105, an LF transmission unit 106, and the like.
  • the control unit 101 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like.
  • the CPU in the control unit 101 executes the control program stored in the ROM, thereby controlling the operation of the hardware included in the in-vehicle device 100 and causing the entire device to function as the in-vehicle device of the present application.
  • the RAM in the control unit 101 stores various data generated during execution of the control program.
  • the control unit 101 may have functions such as a timer that measures an elapsed time from when a measurement start instruction is given to when a measurement end instruction is given, and a counter that counts the number.
  • the storage unit 102 includes a nonvolatile memory such as an EEPROM (ElectronicallynErasablerasProgrammable Read Only Memory), and stores various types of information.
  • the various types of information stored in the storage unit 102 include authentication information such as an ID (Identifier) of the vehicle C on which the in-vehicle device 100 is mounted, an ID of the portable device 200 that is a communication partner, and key information used for encryption processing, for example. Is included.
  • the input / output unit 103 includes an interface for connecting the door lock mechanism 111 and the door lock operation unit 112, for example.
  • the door lock mechanism 111 includes a mechanical mechanism for locking or unlocking each vehicle door of the vehicle C, an actuator for electrically operating the mechanical mechanism, and the like.
  • the door lock operation unit 112 is, for example, a key cylinder provided on a vehicle door for a driver's seat, a request switch provided on a door handle, or the like.
  • the door lock mechanism 111 operates an actuator or the like to lock or unlock the door.
  • Information that the key cylinder is operated by the mechanical key is output to the door lock mechanism 111 through the input / output unit 103, and the door lock mechanism 111 is configured to operate based on the output information.
  • wireless communication is performed between the in-vehicle device 100 and the portable device 200.
  • the in-vehicle device 100 transmits a detection signal for detecting the portable device 200 from the LF transmission antennas 106a to 106e and receives a response signal for the detection signal from the valid portable device 200, the in-vehicle device 100 Lock or unlock the door.
  • the request switch may be a push button type switch or a switch using a contact sensor that detects contact with the door handle.
  • the vehicle door may be locked and unlocked by wireless communication between the in-vehicle device 100 and the portable device 200 without the occupant operating the door lock operation unit 112.
  • the in-vehicle device 100 locks or unlocks the vehicle door based on the unlocking or locking information included in the received operation signal. You may lock.
  • the in-vehicle communication unit 104 includes, for example, a CAN communication interface (CAN: Controller Area Network), and is connected to another ECU included in the vehicle C via a CAN bus.
  • the in-vehicle communication unit 104 transmits / receives data to / from another ECU (not shown) according to the CAN protocol.
  • the RF receiving unit 105 is connected to the RF receiving antenna 105a, receives a RF signal through the RF receiving antenna 105a, a measuring circuit that measures a received signal strength (RSSI: Received Signal Strength) indicator of the received signal, and the like. Is provided.
  • the RF reception unit 105 receives an operation signal transmitted from the portable device 200 through the RF reception antenna 105 a and sends the received operation signal to the control unit 101.
  • the LF transmission unit 106 includes a signal generation circuit that generates a signal to be transmitted based on a signal input from the control unit 101, an amplification circuit that amplifies the generated signal, and the like.
  • the amplified signal is transmitted to the LF transmission antenna 106a. Send to outside from ⁇ 106e.
  • the LF transmission unit 106 transmits, for example, a detection signal (LF signal) for detecting the portable device 200 through the LF transmission antennas 106a to 106e.
  • a detection signal LF signal
  • the authentication information stored in the storage unit 102 is added to the LF signal transmitted from the LF transmission unit 106.
  • the LF transmitter 106 alternately transmits detection signals whose phases are different from each other by 180 degrees.
  • FIG. 3 is a block diagram illustrating the internal configuration of the portable device 200.
  • the portable device 200 includes a control unit 201, a storage unit 202, an operation unit 203, an RF transmission unit 204, an LF reception unit 205, and the like.
  • the control unit 201 includes, for example, a CPU and a ROM.
  • the CPU in the control unit 201 executes the control program stored in the ROM, thereby controlling the operation of each hardware included in the portable device 200 and causing the entire device to function as the portable device of the present application.
  • the control unit 201 may include functions such as a timer that measures an elapsed time from when a measurement start instruction is given to when a measurement end instruction is given, and a counter that counts the number.
  • the storage unit 202 is configured by a nonvolatile memory such as an EEPROM, and stores various types of information.
  • the various types of information stored in the storage unit 202 include, for example, the ID of the portable device 200, the ID of the vehicle C on which the in-vehicle device 100 serving as a communication partner is mounted, key information used for encryption processing, and the like.
  • the operation unit 203 includes an interface for accepting an operation by a passenger.
  • the operation unit 203 includes an unlock button 203a that is operated when the door of the vehicle C is unlocked, and a lock button 203b that is operated when the door of the vehicle C is locked.
  • the operation unit 203 outputs a signal indicating that the unlock button 203a (or lock button 203b) has been operated to the control unit 201.
  • control unit 201 When the control unit 201 receives a signal indicating that the unlock button 203a (or the lock button 203b) has been operated, the control unit 201 sends a control signal for instructing unlocking (or locking) the door of the vehicle C to the RF transmission unit 204. To do.
  • the RF transmission unit 204 includes a signal generation circuit that generates an RF signal from the control signal output from the control unit 201, an amplification circuit that amplifies the generated signal, and the like.
  • the amplified signal is externally transmitted from the RF transmission antenna 204a.
  • the RF transmission unit 204 can transmit an RF signal instructing unlocking (or locking) of the vehicle door from the RF transmission antenna 204a in accordance with a control signal from the control unit 201.
  • authentication information stored in the storage unit 202 is added to the RF signal transmitted from the RF transmission unit 204.
  • the LF reception unit 205 is connected to the LF reception antenna 205a, and includes a reception circuit that receives an LF signal through the LF reception antenna 205a, a measurement circuit that measures the signal strength of the received signal, and the like.
  • the LF reception unit 205 subtracts the environmental noise included in the received signal.
  • the detection signal after the subtraction of the environmental noise is sent to the control unit 201.
  • the control unit 201 receives a detection signal from the LF reception unit 205, the control unit 201 performs processing for transmitting a response signal to the detection signal from the RF transmission unit 204.
  • the control unit 201 adds signal strength (RSSI) information of the detection signal to the response signal to be transmitted, and transmits the added RF signal from the RF transmission unit 204.
  • RSSI signal strength
  • FIG. 4 is a block diagram illustrating a configuration example of the LF transmission unit 106 included in the in-vehicle device 100.
  • the LF transmission unit 106 includes, for example, a signal generation circuit 1061, an amplification circuit 1062, a switch circuit 1063, and a phase inversion circuit 1064.
  • the signal generation circuit 1061 generates a signal to be transmitted based on the signal input from the control unit 101.
  • the signal generated by the signal generation circuit 1061 is input to the subsequent amplification circuit 1062, and the signal is amplified by the amplification circuit 1062.
  • the switch circuit 1063 receives a switching signal having a constant period input from the control unit 101.
  • the switch circuit 1063 alternately switches the output destination to a path that does not pass through the phase inversion circuit 1064 and an output destination that passes through the phase inversion circuit 1064 according to the input switching signal.
  • the switch circuit 1063 selects a path that does not pass through the phase inverter circuit 1064, the signal amplified by the amplifier circuit 1062 is output to each of the LF transmission antennas 106a to 106e without the phase being inverted.
  • phase inverter circuit 1064 when the path through the phase inverter circuit 1064 is selected by the switch circuit 1063, the phase of the signal amplified by the amplifier circuit 1062 is inverted (the phase is changed by 180 degrees) by the phase inverter circuit 1064.
  • the inverted signal is output to each LF transmitting antenna 106a to 106e.
  • FIG. 5 is an explanatory diagram for explaining LF signals transmitted and received by the in-vehicle device 100 and the portable device 200.
  • FIG. 5A shows an example of an LF signal (transmission signal) transmitted from the in-vehicle device 100.
  • the LF transmission unit 106 of the in-vehicle device 100 performs phase inversion at a predetermined cycle when transmitting the LF signal.
  • the radio waves related to the LF signals transmitted from the LF transmitting antennas 106a to 106e have phases different by 180 degrees between the period A corresponding to one period and the period B following the period A. It shows how to hold it.
  • FIG. 5B shows an example of an LF signal (received signal) received by the LF receiver 205 of the portable device 200.
  • the received signal received by the LF receiver 205 of the portable device 200 is more environmental noise than the LF signal transmitted from the LF transmitter 106 of the in-vehicle device 100.
  • the signal is superimposed.
  • the LF signal (thick line) and the environmental noise (thin line) are shown separately.
  • FIG. 5C shows an example of the LF signal after the subtraction process.
  • the environmental noise is not a signal having a specific phase relationship with the transmission target LF signal (for example, white noise)
  • the environmental noise is not amplified by the subtraction processing executed by the control unit 201 and is converted into a relatively small value. Is done. Therefore, environmental noise can be reduced by the subtraction processing executed by the control unit 200.
  • FIG. 6 is a flowchart for explaining a procedure of processing executed by the portable device 200.
  • the control unit 201 of the portable device 200 determines whether or not the LF reception unit 205 has received the LF signal for the period A described above (step S101). If not received (S101: NO), the control unit 201 waits until an LF signal corresponding to the period A is received.
  • control unit 201 stores the received LF signal in the storage unit 202 (step S102).
  • control unit 201 determines whether or not the LF reception unit 205 has received an LF signal corresponding to a period B following the period A (that is, an LF signal whose phase has been inverted on the vehicle-mounted device 100 side) (step S1201). S103). If not received (S103: NO), the control unit 201 waits until an LF signal corresponding to the period B is received.
  • control unit 201 uses the LF signal for the period B received in step S103 from the LF signal for the period A stored in the storage unit 202 in step S102.
  • a subtraction process for subtracting the LF signal is executed (step S104).
  • control unit 201 calculates the signal strength of the LF signal based on the signal after the subtraction process (step S105). At this time, the control unit 201 divides the amplitude value of the signal obtained by the subtraction process in step S104 by 2, and averages the signal strength of the LF signal corresponding to the period A and the signal strength of the LF signal corresponding to the period B. A value may be obtained.
  • control unit 201 controls the RF transmission unit 204 to transmit an RF signal including information on the calculated signal strength, and transmits the RF signal to the outside from the RF transmission unit 204 (step S106).
  • the in-vehicle device 100 can acquire the signal strength of the LF signal measured by the portable device 200 by receiving the RF signal transmitted from the portable device 200 by the RF receiving unit 105. Since the signal strength is measured with the environmental noise reduced in the portable device 200, the in-vehicle device 100 detects the position of the portable device 200 based on the signal strength, thereby determining the position of the portable device 200. It is possible to detect with high accuracy, and it is possible to accurately determine whether the portable device 200 exists inside the vehicle or outside the vehicle.

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Lock And Its Accessories (AREA)

Abstract

Provided is an on-vehicle communication system, an on-vehicle device and a portable apparatus. This on-vehicle device is provided with: an on-vehicle side transmitting part which alternately two kinds of detection signals having phases different by 180 degrees; an on-vehicle side receiving part which receives a response signal transmitted from a portable apparatus with respect to the detection signal transmitted by the on-vehicle side transmitting part; and a position detection part which detects the position of the portable apparatus on the basis of the response signal received from the on-vehicle side receiving part. The portable apparatus is provided with: a portable apparatus-side receiving part which receives the two kinds of detecting signals transmitted from the on-vehicle transmitting part; a subtraction part which subtracts one from the other of the two kinds of received detecting signals; a calculation part which, on the basis of the signal obtained through the subtraction by the subtraction part, calculates signal intensities of the detecting signals received by the portable apparatus-side receiving part; and a portable apparatus-side transmitting part which transmits a response signal including information about the signal intensities calculated by the calculation part.

Description

車載通信システム、車載装置及び携帯機In-vehicle communication system, in-vehicle device, and portable device
　本発明は、車載通信システム、車載装置及び携帯機に関する。
　本出願は、２０１６年９月７日出願の日本出願第２０１６－１７４８８０号に基づく優先権を主張し、前記日本出願に記載された全ての記載内容を援用するものである。 The present invention relates to an in-vehicle communication system, an in-vehicle device, and a portable device.
This application claims priority based on Japanese Patent Application No. 2016-174880 filed on Sep. 7, 2016, and incorporates all the description content described in the above Japanese application.
　メカニカルキーを用いることなく車両ドアの施錠及び解錠可能にするドアロックシステムとして、キーレスエントリシステム及びスマートエントリシステムが実用化されている。キーレスエントリシステムでは、携帯機に設けられた操作部（ロックボタン又はアンロックボタン）に対する操作を乗員が行った場合、携帯機から車載装置へ制御信号が送信され、当該制御信号を受信した車載装置により車両ドアの施錠又は解錠の制御が行われる。また、スマートエントリシステムでは、携帯機を携帯した乗員が車両のドアハンドルに設けられたリクエストスイッチを操作した場合、携帯機と車載装置との間で無線通信が行われ、車載機より車両ドアの施錠又は解錠に係る制御が行われる。 A keyless entry system and a smart entry system have been put to practical use as door lock systems that can lock and unlock a vehicle door without using a mechanical key. In a keyless entry system, when an occupant performs an operation on an operation unit (a lock button or an unlock button) provided in a portable device, a control signal is transmitted from the portable device to the in-vehicle device, and the in-vehicle device that has received the control signal Thus, locking or unlocking of the vehicle door is controlled. In the smart entry system, when an occupant carrying a portable device operates a request switch provided on the door handle of the vehicle, wireless communication is performed between the portable device and the in-vehicle device, and the vehicle door is Control related to locking or unlocking is performed.
　このようなキーレスエントリシステム及びスマートエントリシステムでは、車両ドアの開閉時に携帯機の位置を判定し、車内に携帯機が存在する場合には、エンジンの始動が許可される。また、エンジン始動後から一定時間（例えば３０秒）の経過後に携帯機をサーチし、携帯機が車内で検知されなかった場合、通知音又は車両のディスプレイに通知を表示して運転者に携帯機の不携帯を通知するシステムも提案されている。 In such a keyless entry system and smart entry system, the position of the portable device is determined when the vehicle door is opened and closed, and if the portable device exists in the vehicle, the engine is permitted to start. In addition, after a certain time (for example, 30 seconds) has elapsed since the engine was started, the portable device is searched, and if the portable device is not detected in the vehicle, a notification sound or a notification is displayed on the vehicle display to inform the driver of the portable device. A system for notifying the non-portable person has also been proposed.
特許第５５９６９２７号公報Japanese Patent No. 5596927
　上述したキーレスエントリシステム及びスマートエントリシステムにおいて、車載装置と携帯機との間で送受信される信号に環境ノイズが含まれる場合、携帯機の位置を誤判定する可能性がある。 In the above keyless entry system and smart entry system, if the environmental noise is included in the signal transmitted and received between the in-vehicle device and the portable device, the position of the portable device may be erroneously determined.
　このため、携帯機にて事前に環境ノイズを計測しておき、車載装置から検出信号を受信した場合、事前に計測しておいた環境ノイズを減算することで、環境ノイズの影響を低減する技術が提案されている。 For this reason, technology that reduces environmental noise by subtracting environmental noise measured in advance when environmental noise is measured in advance on a portable device and a detection signal is received from an in-vehicle device Has been proposed.
　しかしながら、環境ノイズは時間や場所に応じて変化するので、携帯機において事前に環境ノイズを計測する従来の構成では、環境ノイズを計測する動作を定期的に実行する必要があり、携帯機の電池寿命が短くなってしまうという問題点を有している。 However, since environmental noise changes according to time and place, the conventional configuration for measuring environmental noise in advance in a portable device needs to periodically perform an operation for measuring environmental noise. There is a problem that the lifetime is shortened.
　本発明は、斯かる事情に鑑みてなされたものであり、環境ノイズを携帯機にて定期的に計測することなく、携帯機にて受信した検出信号より環境ノイズを除去することができる車載通信システム、車載装置及び携帯機を提供することを目的とする。 The present invention has been made in view of such circumstances, and in-vehicle communication capable of removing environmental noise from a detection signal received by a portable device without periodically measuring the environmental noise by the portable device. An object is to provide a system, an in-vehicle device, and a portable device.
　本発明の一態様に係る車載通信システムは、車両に搭載された車載装置と、該車載装置と無線通信が可能である携帯機とを備え、前記車載装置と前記携帯機との間で無線通信を行うことにより、前記車載装置にて前記携帯機の位置を検出する車載通信システムであって、前記車載装置は、互いに位相が１８０度異なる２種類の検出信号を交互に送信する車載側送信部と、該車載側送信部が送信した前記検出信号に対して前記携帯機から送信される応答信号を受信する車載側受信部と、該車載側受信部にて受信した応答信号に基づき、前記携帯機の位置を検出する位置検出部とを備え、前記携帯機は、前記車載側送信部から送信される２種類の検出信号を受信する携帯機側受信部と、受信した２種類の検出信号の一方から他方を減算する減算部と、該減算部により減算して得られる信号に基づき、前記携帯機側受信部が受信した前記検出信号の信号強度を算出する算出部と、該算出部により算出した信号強度の情報を含む応答信号を送信する携帯機側送信部とを備える。 An in-vehicle communication system according to an aspect of the present invention includes an in-vehicle device mounted on a vehicle and a portable device capable of wireless communication with the in-vehicle device, and wireless communication between the in-vehicle device and the portable device. The vehicle-mounted communication system detects the position of the portable device by the vehicle-mounted device, and the vehicle-mounted device alternately transmits two types of detection signals whose phases are different from each other by 180 degrees. And an on-vehicle side receiving unit that receives a response signal transmitted from the portable device in response to the detection signal transmitted by the on-vehicle side transmitting unit, and the portable device based on the response signal received by the on-vehicle side receiving unit. A position detection unit that detects the position of the machine, and the portable device receives the two types of detection signals transmitted from the in-vehicle side transmission unit, and the received two types of detection signals. Subtraction to subtract one from the other Including a calculation unit that calculates the signal strength of the detection signal received by the portable device-side reception unit based on the signal obtained by subtraction by the subtraction unit, and information on the signal strength calculated by the calculation unit A portable device-side transmitter for transmitting signals.
　本発明の一態様に係る車載装置は、携帯機との間で無線通信を行うことにより、前記携帯機の位置を検出する車載装置であって、互いに位相が１８０度異なる２種類の検出信号を交互に送信する送信部と、該送信部が送信した前記検出信号に対して前記携帯機から送信される応答信号を受信する受信部と、該受信部にて受信した応答信号に基づき、前記携帯機の位置を検出する位置検出部とを備える。 An in-vehicle device according to an aspect of the present invention is an in-vehicle device that detects the position of the portable device by performing wireless communication with the portable device, and receives two types of detection signals that are 180 degrees out of phase with each other. A transmitter that alternately transmits, a receiver that receives a response signal transmitted from the portable device with respect to the detection signal transmitted by the transmitter, and the portable device based on the response signal received by the receiver A position detector for detecting the position of the machine.
　本発明の一態様に係る携帯機は、車載装置と無線通信を行う携帯機であって、前記車載装置から交互に送信され、互いに位相が１８０度異なる２種類の検出信号を受信する受信部と、受信した２種類の検出信号の一方から他方を減算する減算部と、該減算部により減算して得られる信号に基づき、前記受信部が受信した前記検出信号の信号強度を算出する算出部と、該算出部により算出した信号強度の情報を含む応答信号を送信する送信部とを備える。 A portable device according to one aspect of the present invention is a portable device that performs wireless communication with an in-vehicle device, and a reception unit that receives two types of detection signals that are alternately transmitted from the in-vehicle device and that are 180 degrees out of phase with each other. A subtractor that subtracts one of the two types of received detection signals from the other; a calculator that calculates the signal strength of the detection signal received by the receiver based on a signal obtained by subtraction by the subtractor; A transmission unit that transmits a response signal including information on the signal strength calculated by the calculation unit.
　本願によれば、環境ノイズを携帯機にて定期的に計測することなく、受信した車載装置からの検出信号より環境ノイズを除去することができる。 According to the present application, it is possible to remove the environmental noise from the received detection signal from the in-vehicle device without periodically measuring the environmental noise with a portable device.
本実施の形態に係る車載制御システムの概略構成を説明する模式図である。It is a mimetic diagram explaining the schematic structure of the in-vehicle control system concerning this embodiment. 車載装置の内部構成を説明するブロック図である。It is a block diagram explaining the internal structure of a vehicle-mounted apparatus. 携帯機の内部構成を説明するブロック図である。It is a block diagram explaining the internal structure of a portable device. 車載装置が備えるＬＦ送信部の構成例を示すブロック図である。It is a block diagram which shows the structural example of the LF transmission part with which a vehicle-mounted apparatus is provided. 車載装置及び携帯機が送受信するＬＦ信号を説明する説明図である。It is explanatory drawing explaining the LF signal which an in-vehicle apparatus and a portable device transmit / receive. 携帯機が実行する処理の手順を説明するフローチャートである。It is a flowchart explaining the procedure of the process which a portable machine performs.
　本発明の実施態様を列記して説明する。また、以下に記載する実施形態の少なくとも一部を任意に組み合わせてもよい。 Embodiments of the present invention will be listed and described. Moreover, you may combine arbitrarily at least one part of embodiment described below.
　本願の一態様に係る車載通信システムは、車両に搭載された車載装置と、該車載装置と無線通信が可能である携帯機とを備え、前記車載装置と前記携帯機との間で無線通信を行うことにより、前記車載装置にて前記携帯機の位置を検出する車載通信システムであって、前記車載装置は、互いに位相が１８０度異なる２種類の検出信号を交互に送信する車載側送信部と、該車載側送信部が送信した前記検出信号に対して前記携帯機から送信される応答信号を受信する車載側受信部と、該車載側受信部にて受信した応答信号に基づき、前記携帯機の位置を検出する位置検出部とを備え、前記携帯機は、前記車載側送信部から送信される２種類の検出信号を受信する携帯機側受信部と、受信した２種類の検出信号の一方から他方を減算する減算部と、該減算部により減算して得られる信号に基づき、前記携帯機側受信部が受信した前記検出信号の信号強度を算出する算出部と、該算出部により算出した信号強度の情報を含む応答信号を送信する携帯機側送信部とを備える。 An in-vehicle communication system according to one aspect of the present application includes an in-vehicle device mounted on a vehicle and a portable device capable of wireless communication with the in-vehicle device, and performs wireless communication between the in-vehicle device and the portable device. An in-vehicle communication system that detects the position of the portable device by the in-vehicle device, wherein the in-vehicle device alternately transmits two types of detection signals that are 180 degrees out of phase with each other. An in-vehicle side receiving unit that receives a response signal transmitted from the portable device in response to the detection signal transmitted by the in-vehicle side transmitting unit, and the portable device based on the response signal received by the in-vehicle side receiving unit A position detection unit that detects the position of the mobile device, wherein the portable device receives the two types of detection signals transmitted from the in-vehicle side transmission unit, and one of the two types of received detection signals Subtractor that subtracts the other from A calculation unit for calculating the signal strength of the detection signal received by the portable device-side receiving unit based on the signal obtained by subtraction by the subtraction unit, and a response signal including information on the signal strength calculated by the calculation unit And a portable device side transmission unit.
　本願の一態様に係る車載通信システムは、前記車載側送信部は、送信すべき信号の位相を１８０度変更する位相反転器と、該位相反転器を経由する経路と、前記位相反転器を経由しない経路とを所定周期で切り替えるスイッチとを備える。 In the in-vehicle communication system according to one aspect of the present application, the in-vehicle-side transmission unit includes a phase inverter that changes the phase of a signal to be transmitted by 180 degrees, a path that passes through the phase inverter, and the phase inverter. And a switch for switching a route not to be performed at a predetermined cycle.
　本願の一態様に係る車載装置は、携帯機との間で無線通信を行うことにより、前記携帯機の位置を検出する車載装置であって、互いに位相が１８０度異なる２種類の検出信号を交互に送信する送信部と、該送信部が送信した前記検出信号に対して前記携帯機から送信される応答信号を受信する受信部と、該受信部にて受信した応答信号に基づき、前記携帯機の位置を検出する位置検出部とを備える。 An in-vehicle device according to an aspect of the present application is an in-vehicle device that detects the position of the portable device by performing wireless communication with the portable device, and alternately detects two types of detection signals that are 180 degrees out of phase with each other. Based on the response signal received by the receiving unit, the receiving unit that receives the response signal transmitted from the portable device with respect to the detection signal transmitted by the transmitting unit, And a position detecting unit for detecting the position of.
　本願の一態様に係る携帯機は、車載装置と無線通信を行う携帯機であって、前記車載装置から交互に送信され、互いに位相が１８０度異なる２種類の検出信号を受信する受信部と、受信した２種類の検出信号の一方から他方を減算する減算部と、該減算部により減算して得られる信号に基づき、前記受信部が受信した前記検出信号の信号強度を算出する算出部と、該算出部により算出した信号強度の情報を含む応答信号を送信する送信部とを備える。 A portable device according to one aspect of the present application is a portable device that performs wireless communication with an in-vehicle device, and a reception unit that receives two types of detection signals that are alternately transmitted from the in-vehicle device and that are 180 degrees out of phase with each other; A subtractor for subtracting the other from one of the two types of detection signals received, a calculator for calculating the signal strength of the detection signal received by the receiver based on a signal obtained by subtraction by the subtractor; A transmission unit that transmits a response signal including information on the signal strength calculated by the calculation unit.
　上記一態様にあっては、送信側の車載装置から検出信号を送信する際、互いに位相が１８０度異なる２種類の検出信号を送信し、受信側の携帯機では、受信した２種類の検出信号の一方から他方を減算する。よって、検出信号の位相と同位相又は逆位相のような特定の位相関係を有していない環境ノイズを携帯機側にて低減することができ、受信した検出信号の信号強度を正確に計測することができる。また、携帯機側にて計測した信号強度を含む応答信号を車載装置へ返信することにより、車載装置では、携帯機の位置を正確に検出することが可能となる。 In the above aspect, when the detection signal is transmitted from the in-vehicle device on the transmission side, two types of detection signals whose phases are different from each other by 180 degrees are transmitted, and the received portable device receives the two types of detection signals. Subtract one from the other. Therefore, environmental noise that does not have a specific phase relationship such as the same phase or opposite phase as the phase of the detection signal can be reduced on the portable device side, and the signal strength of the received detection signal is accurately measured. be able to. In addition, by returning a response signal including the signal strength measured on the portable device side to the in-vehicle device, the in-vehicle device can accurately detect the position of the portable device.
　以下、本発明をその実施の形態を示す図面に基づいて具体的に説明する。
　図１は本実施の形態に係る車載制御システムの概略構成を説明する模式図である。本実施の形態に係る車載制御システムは、例えば、車両Ｃに搭載される車載装置１００と、乗員によって操作される携帯機２００とを備える。 Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
FIG. 1 is a schematic diagram illustrating a schematic configuration of an in-vehicle control system according to the present embodiment. The in-vehicle control system according to the present embodiment includes, for example, an in-vehicle device 100 mounted on a vehicle C and a portable device 200 operated by an occupant.
　車載装置１００は、車両に搭載される複数のＥＣＵ（Electronic Controller Unit）のうちの１つであって、例えば、車両ドアの施錠及び開錠に係る制御、空気調和機、車内外灯器類、ボディ系のアクチュエータなどの動作に係る制御等を統合的に行なう所謂ＢＣＭ（Body Control Module）である。 The in-vehicle device 100 is one of a plurality of ECUs (Electronic Controllers Units) mounted on the vehicle, and includes, for example, control related to locking and unlocking a vehicle door, an air conditioner, in-and-out lights, a body This is a so-called BCM (Body Control Module) that performs integrated control related to the operation of the system actuators.
　車載装置１００は、携帯機２００と無線通信を行うために、ＲＦ受信アンテナ１０５ａ及び複数のＬＦ送信アンテナ１０６ａ～１０６ｅを備える。ＲＦ受信アンテナ１０５ａは、例えば車載装置１００に内蔵されるアンテナであり、ＲＦ帯の周波数を有する信号（以下、ＲＦ信号ともいう）を受信する。ＬＦ送信アンテナ１０６ａ～１０６ｅは、例えば車両Ｃが備える各車両ドアの周辺に設けられるアンテナであり、ＬＦ帯の周波数を有する信号（以下、ＬＦ信号ともいう）を送信する。ＬＦ送信アンテナ１０６ａ～１０６ｅは、例えば、運転席、助手席、右後部座席、左後部座席用の車両ドアの周辺、及び後部ドアの周辺に設けられる。 The in-vehicle device 100 includes an RF reception antenna 105a and a plurality of LF transmission antennas 106a to 106e in order to perform wireless communication with the portable device 200. The RF receiving antenna 105a is an antenna built in the in-vehicle device 100, for example, and receives a signal having an RF band frequency (hereinafter also referred to as an RF signal). The LF transmission antennas 106a to 106e are antennas provided around each vehicle door provided in the vehicle C, for example, and transmit a signal having an LF band frequency (hereinafter also referred to as an LF signal). The LF transmission antennas 106a to 106e are provided, for example, in the vicinity of the vehicle door for the driver seat, the passenger seat, the right rear seat, the left rear seat, and the rear door.
　携帯機２００は、車両ドアの解錠及び施錠に係る操作を受付けるために、アンロックボタン２０３ａ及びロックボタン２０３ｂを備える。また、携帯機２００は、車両Ｃに搭載された車載装置１００と無線通信を行うために、ＲＦ送信部２０４及びＬＦ受信部２０５を備える（図３を参照）。携帯機２００は、アンロックボタン２０３ａ又はロックボタン２０３ｂにより、車両ドアの解錠又は施錠に係る操作を受付けた場合、ＲＦ送信部２０４より車両ドアの解錠又は施錠を指示する信号を送信することが可能である。 The portable device 200 includes an unlock button 203a and a lock button 203b in order to accept operations related to unlocking and locking of the vehicle door. In addition, the portable device 200 includes an RF transmission unit 204 and an LF reception unit 205 in order to perform wireless communication with the in-vehicle device 100 mounted on the vehicle C (see FIG. 3). When the portable device 200 receives an operation related to unlocking or locking the vehicle door by the unlock button 203a or the lock button 203b, the portable device 200 transmits a signal instructing unlocking or locking of the vehicle door from the RF transmission unit 204. Is possible.
　ここで、ＬＦ信号を用いた無線通信の通信範囲は１ｍ程度であるのに対し、ＲＦ信号を用いた無線通信の通信範囲は数十ｍ程度である。このことを利用して、車両Ｃが備える全てのドアを解錠する場合と、車両Ｃが備える特定のドア（例えば運転席側のドア）を解錠する場合とを切り替えることが可能である。例えば、車両ＣのＬＦ送信アンテナ１０６ａ～１０６ｅによる通信範囲Ｒａ～Ｒｅの何れかに携帯機２００が存在する場合に、車両ドアの解錠を指示する操作信号を携帯機２００から受信したとき、車載装置１００は、車両Ｃの全てのドアを解錠する制御を行ってもよい。また、ＬＦ送信アンテナ１０６ａ～１０６ｅによる通信範囲Ｒａ～Ｒｅに携帯機２００が存在しない場合に、車両ドアの解錠を指示する操作信号を携帯機２００から受信した場合、車載装置１００は、特定のドアを解錠する制御を行ってもよい。 Here, the communication range of the wireless communication using the LF signal is about 1 m, while the communication range of the wireless communication using the RF signal is about several tens of meters. Using this, it is possible to switch between unlocking all the doors provided in the vehicle C and unlocking a specific door (for example, a door on the driver's seat side) provided in the vehicle C. For example, when the portable device 200 is present in any one of the communication ranges Ra to Re by the LF transmitting antennas 106a to 106e of the vehicle C, when the operation signal instructing unlocking of the vehicle door is received from the portable device 200, The apparatus 100 may perform control to unlock all doors of the vehicle C. Further, when the portable device 200 is not present in the communication ranges Ra to Re by the LF transmitting antennas 106a to 106e, when the operation signal instructing the unlocking of the vehicle door is received from the portable device 200, the in-vehicle device 100 performs a specific operation. Control to unlock the door may be performed.
　図２は車載装置１００の内部構成を説明するブロック図である。車載装置１００は、制御部１０１、記憶部１０２、入出力部１０３、車内通信部１０４、ＲＦ受信部１０５、及びＬＦ送信部１０６などを備える。 FIG. 2 is a block diagram illustrating the internal configuration of the in-vehicle device 100. The in-vehicle device 100 includes a control unit 101, a storage unit 102, an input / output unit 103, an in-vehicle communication unit 104, an RF reception unit 105, an LF transmission unit 106, and the like.
　制御部１０１は、例えば、ＣＰＵ（Central Processing Unit）、ＲＯＭ（Read Only Memory）、ＲＡＭ（Random Access Memory）などを備える。制御部１０１内のＣＰＵは、ＲＯＭに格納された制御プログラムを実行することにより、車載装置１００が備える上記ハードウェアの動作を制御し、機器全体を本願の車載装置として機能させる。制御部１０１内のＲＡＭには、制御プログラムの実行中に生成される各種データが記憶される。なお、制御部１０１は、計測開始指示を与えてから計測終了指示を与えるまでの経過時間を計測するタイマ、数をカウントするカウンタ等の機能を備えていてもよい。 The control unit 101 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The CPU in the control unit 101 executes the control program stored in the ROM, thereby controlling the operation of the hardware included in the in-vehicle device 100 and causing the entire device to function as the in-vehicle device of the present application. The RAM in the control unit 101 stores various data generated during execution of the control program. Note that the control unit 101 may have functions such as a timer that measures an elapsed time from when a measurement start instruction is given to when a measurement end instruction is given, and a counter that counts the number.
　記憶部１０２は、例えば、ＥＥＰＲＯＭ（Electronically Erasable Programmable Read Only Memory）などの不揮発性メモリにより構成されており、各種情報を記憶する。ここで、記憶部１０２が記憶する各種情報には、例えば、車載装置１００を搭載する車両ＣのＩＤ（Identifier）、通信相手となる携帯機２００のＩＤ、暗号処理に用いる鍵情報等の認証情報が含まれる。 The storage unit 102 includes a nonvolatile memory such as an EEPROM (ElectronicallynErasablerasProgrammable Read Only Memory), and stores various types of information. Here, the various types of information stored in the storage unit 102 include authentication information such as an ID (Identifier) of the vehicle C on which the in-vehicle device 100 is mounted, an ID of the portable device 200 that is a communication partner, and key information used for encryption processing, for example. Is included.
　入出力部１０３は、例えば、ドアロック機構１１１及びドアロック操作部１１２を接続するためのインタフェースを備える。 The input / output unit 103 includes an interface for connecting the door lock mechanism 111 and the door lock operation unit 112, for example.
　ドアロック機構１１１は、車両Ｃの各車両ドアの施錠又は解錠するための機械機構、及びこの機械機構を電気的に動作させるためのアクチュエータ等を有している。また、ドアロック操作部１１２は、例えば、運転席用の車両ドアに設けられたキーシリンダ、ドアハンドルに設けられたリクエストスイッチ等である。 The door lock mechanism 111 includes a mechanical mechanism for locking or unlocking each vehicle door of the vehicle C, an actuator for electrically operating the mechanical mechanism, and the like. The door lock operation unit 112 is, for example, a key cylinder provided on a vehicle door for a driver's seat, a request switch provided on a door handle, or the like.
　例えば、メカニカルキー（不図示）を用いる場合、車両ドアに設けられたキーシリンダにメカニカルキーが挿入され、施錠操作又は解錠操作が行われる。このとき、ドアロック機構１１１はアクチュエータ等を動作させ、ドアの施錠又は解錠を行う。メカニカルキーによりキーシリンダが操作された情報は入出力部１０３を通じてドアロック機構１１１に出力され、出力された情報に基づきドアロック機構１１１が動作するように構成されている。 For example, when a mechanical key (not shown) is used, the mechanical key is inserted into a key cylinder provided on the vehicle door, and a locking operation or an unlocking operation is performed. At this time, the door lock mechanism 111 operates an actuator or the like to lock or unlock the door. Information that the key cylinder is operated by the mechanical key is output to the door lock mechanism 111 through the input / output unit 103, and the door lock mechanism 111 is configured to operate based on the output information.
　また、携帯機２００を持つ乗員が、車両Ｃのドアハンドルに設けられたリクエストスイッチを操作した場合、車載装置１００と携帯機２００との間で無線通信を行う。その無線通信において、車載装置１００が携帯機２００を検出するための検出信号をＬＦ送信アンテナ１０６ａ～１０６ｅから送信し、検出信号に対する応答信号を正当な携帯機２００から受信した場合、車載装置１００はドアの施錠又は解錠を行う。なお、リクエストスイッチは、押しボタン式のスイッチであってもよく、ドアハンドルへの接触を検知する接触センサを用いたスイッチであってもよい。 Further, when an occupant having the portable device 200 operates a request switch provided on the door handle of the vehicle C, wireless communication is performed between the in-vehicle device 100 and the portable device 200. In the wireless communication, when the in-vehicle device 100 transmits a detection signal for detecting the portable device 200 from the LF transmission antennas 106a to 106e and receives a response signal for the detection signal from the valid portable device 200, the in-vehicle device 100 Lock or unlock the door. The request switch may be a push button type switch or a switch using a contact sensor that detects contact with the door handle.
　更に、ドアロック操作部１１２を乗員が操作することなく、車載装置１００と携帯機２００との間の無線通信により車両ドアの施錠及び解錠を行えるようにしてもよい。例えば、車載装置１００は、携帯機２００から送信される操作信号をＲＦ受信アンテナ１０５ａにて受信した場合、受信した操作信号に含まれる解錠又は施錠に係る情報に基づき、車両ドアの施錠又は解錠を行ってもよい。 Furthermore, the vehicle door may be locked and unlocked by wireless communication between the in-vehicle device 100 and the portable device 200 without the occupant operating the door lock operation unit 112. For example, when the operation signal transmitted from the portable device 200 is received by the RF receiving antenna 105a, the in-vehicle device 100 locks or unlocks the vehicle door based on the unlocking or locking information included in the received operation signal. You may lock.
　車内通信部１０４は、例えばＣＡＮ通信インタフェース（CAN : Controller Area Network）を備えており、ＣＡＮバスを介して車両Ｃが備える他のＥＣＵに接続されている。車内通信部１０４は、ＣＡＮプロトコルに従って他のＥＣＵ（不図示）とデータの送受信を行う。 The in-vehicle communication unit 104 includes, for example, a CAN communication interface (CAN: Controller Area Network), and is connected to another ECU included in the vehicle C via a CAN bus. The in-vehicle communication unit 104 transmits / receives data to / from another ECU (not shown) according to the CAN protocol.
　ＲＦ受信部１０５は、ＲＦ受信アンテナ１０５ａに接続されており、ＲＦ受信アンテナ１０５ａを通じてＲＦ信号を受信する受信回路、受信した信号の受信信号強度（RSSI：Received Signal Strength Indicator）を測定する測定回路等を備える。本実施の形態では、ＲＦ受信部１０５は、携帯機２００から送信される操作信号をＲＦ受信アンテナ１０５ａを通じて受信し、受信した操作信号を制御部１０１へ送出する。 The RF receiving unit 105 is connected to the RF receiving antenna 105a, receives a RF signal through the RF receiving antenna 105a, a measuring circuit that measures a received signal strength (RSSI: Received Signal Strength) indicator of the received signal, and the like. Is provided. In the present embodiment, the RF reception unit 105 receives an operation signal transmitted from the portable device 200 through the RF reception antenna 105 a and sends the received operation signal to the control unit 101.
　ＬＦ送信部１０６は、制御部１０１から入力される信号に基づき送信すべき信号を生成する信号生成回路、生成した信号を増幅する増幅回路等を備えており、増幅後の信号をＬＦ送信アンテナ１０６ａ～１０６ｅより外部へ送信する。ＬＦ送信部１０６は、制御部１０１からの指示により、例えば携帯機２００を検出するための検出信号（ＬＦ信号）をＬＦ送信アンテナ１０６ａ～１０６ｅを通じて送信する。ここで、ＬＦ送信部１０６から送信されるＬＦ信号には、記憶部１０２に記憶されている認証情報が付加されるものとする。後述するように、本実施の形態では、ＬＦ送信部１０６は互いに位相が１８０度異なる検出信号を交互に送信するようにしている。 The LF transmission unit 106 includes a signal generation circuit that generates a signal to be transmitted based on a signal input from the control unit 101, an amplification circuit that amplifies the generated signal, and the like. The amplified signal is transmitted to the LF transmission antenna 106a. Send to outside from ~ 106e. In response to an instruction from the control unit 101, the LF transmission unit 106 transmits, for example, a detection signal (LF signal) for detecting the portable device 200 through the LF transmission antennas 106a to 106e. Here, it is assumed that the authentication information stored in the storage unit 102 is added to the LF signal transmitted from the LF transmission unit 106. As will be described later, in the present embodiment, the LF transmitter 106 alternately transmits detection signals whose phases are different from each other by 180 degrees.
　図３は携帯機２００の内部構成を説明するブロック図である。携帯機２００は、制御部２０１、記憶部２０２、操作部２０３、ＲＦ送信部２０４、ＬＦ受信部２０５などを備える。 FIG. 3 is a block diagram illustrating the internal configuration of the portable device 200. The portable device 200 includes a control unit 201, a storage unit 202, an operation unit 203, an RF transmission unit 204, an LF reception unit 205, and the like.
　制御部２０１は、例えば、ＣＰＵ、ＲＯＭなどを備える。制御部２０１内のＣＰＵは、ＲＯＭに格納された制御プログラムを実行することにより、携帯機２００が備える各ハードウェアの動作を制御し、機器全体を本願の携帯機として機能させる。なお、制御部２０１は、計測開始指示を与えてから計測終了指示を与えるまでの経過時間を計測するタイマ、数をカウントするカウンタ等の機能を備えていてもよい。 The control unit 201 includes, for example, a CPU and a ROM. The CPU in the control unit 201 executes the control program stored in the ROM, thereby controlling the operation of each hardware included in the portable device 200 and causing the entire device to function as the portable device of the present application. The control unit 201 may include functions such as a timer that measures an elapsed time from when a measurement start instruction is given to when a measurement end instruction is given, and a counter that counts the number.
　記憶部２０２は、ＥＥＰＲＯＭなどの不揮発性メモリにより構成されており、各種情報を記憶する。ここで、記憶部２０２が記憶する各種情報には、例えば、携帯機２００のＩＤ、通信相手となる車載装置１００を搭載する車両ＣのＩＤ、暗号処理に用いる鍵情報等が含まれる。 The storage unit 202 is configured by a nonvolatile memory such as an EEPROM, and stores various types of information. Here, the various types of information stored in the storage unit 202 include, for example, the ID of the portable device 200, the ID of the vehicle C on which the in-vehicle device 100 serving as a communication partner is mounted, key information used for encryption processing, and the like.
　操作部２０３は、乗員による操作を受付けるためのインタフェースを備える。本実施の形態では、操作部２０３は、車両Ｃのドアを解錠する際に操作されるアンロックボタン２０３ａ、及び車両Ｃのドアを施錠する際に操作されるロックボタン２０３ｂを備える。操作部２０３は、アンロックボタン２０３ａ（又はロックボタン２０３ｂ）が乗員により操作された場合、アンロックボタン２０３ａ（又はロックボタン２０３ｂ）が操作されたこと示す信号を制御部２０１へ出力する。制御部２０１は、アンロックボタン２０３ａ（又はロックボタン２０３ｂ）が操作されたこと示す信号を受信した場合、車両Ｃのドアの解錠（又は施錠）を指示する制御信号をＲＦ送信部２０４へ送出する。 The operation unit 203 includes an interface for accepting an operation by a passenger. In the present embodiment, the operation unit 203 includes an unlock button 203a that is operated when the door of the vehicle C is unlocked, and a lock button 203b that is operated when the door of the vehicle C is locked. When the unlock button 203a (or lock button 203b) is operated by the occupant, the operation unit 203 outputs a signal indicating that the unlock button 203a (or lock button 203b) has been operated to the control unit 201. When the control unit 201 receives a signal indicating that the unlock button 203a (or the lock button 203b) has been operated, the control unit 201 sends a control signal for instructing unlocking (or locking) the door of the vehicle C to the RF transmission unit 204. To do.
　ＲＦ送信部２０４は、制御部２０１から出力される制御信号からＲＦ信号を生成する信号生成回路、生成した信号を増幅する増幅回路等を備えており、増幅後の信号をＲＦ送信アンテナ２０４ａより外部へ送信する。例えば、ＲＦ送信部２０４は、制御部２０１からの制御信号に応じて、車両ドアの解錠（又は施錠）を指示するＲＦ信号をＲＦ送信アンテナ２０４ａより送信することが可能である。ここで、ＲＦ送信部２０４から送信されるＲＦ信号には、記憶部２０２に記憶されている認証情報が付加されるものとする。 The RF transmission unit 204 includes a signal generation circuit that generates an RF signal from the control signal output from the control unit 201, an amplification circuit that amplifies the generated signal, and the like. The amplified signal is externally transmitted from the RF transmission antenna 204a. Send to. For example, the RF transmission unit 204 can transmit an RF signal instructing unlocking (or locking) of the vehicle door from the RF transmission antenna 204a in accordance with a control signal from the control unit 201. Here, it is assumed that authentication information stored in the storage unit 202 is added to the RF signal transmitted from the RF transmission unit 204.
　ＬＦ受信部２０５は、ＬＦ受信アンテナ２０５ａに接続されており、ＬＦ受信アンテナ２０５ａを通じてＬＦ信号を受信する受信回路、受信した信号の信号強度を測定する測定回路等を備える。本実施の形態では、ＬＦ受信部２０５は、車両ＣのＬＦ送信アンテナ１０６ａ～１０６ｅから送信される検出信号をＬＦ受信アンテナ２０５ａにて受信した場合、受信した信号に含まれる環境ノイズを減算する処理を行い、環境ノイズの減算後の検出信号を制御部２０１へ送出する。制御部２０１は、ＬＦ受信部２０５から検出信号を受信した場合、当該検出信号に対する応答信号をＲＦ送信部２０４より送信する処理を行う。このとき、制御部２０１は、送信すべき応答信号に対し、検出信号の信号強度（ＲＳＳＩ）の情報を付加し、付加後のＲＦ信号をＲＦ送信部２０４より送信する。 The LF reception unit 205 is connected to the LF reception antenna 205a, and includes a reception circuit that receives an LF signal through the LF reception antenna 205a, a measurement circuit that measures the signal strength of the received signal, and the like. In the present embodiment, when the detection signal transmitted from the LF transmission antennas 106a to 106e of the vehicle C is received by the LF reception antenna 205a, the LF reception unit 205 subtracts the environmental noise included in the received signal. The detection signal after the subtraction of the environmental noise is sent to the control unit 201. When the control unit 201 receives a detection signal from the LF reception unit 205, the control unit 201 performs processing for transmitting a response signal to the detection signal from the RF transmission unit 204. At this time, the control unit 201 adds signal strength (RSSI) information of the detection signal to the response signal to be transmitted, and transmits the added RF signal from the RF transmission unit 204.
　以下、本実施の形態に係る車載装置１００及び携帯機２００の動作について説明する。
　図４は車載装置１００が備えるＬＦ送信部１０６の構成例を示すブロック図である。ＬＦ送信部１０６は、例えば、信号生成回路１０６１、増幅回路１０６２、スイッチ回路１０６３、位相反転回路１０６４を備える。 Hereinafter, operations of the in-vehicle device 100 and the portable device 200 according to the present embodiment will be described.
FIG. 4 is a block diagram illustrating a configuration example of the LF transmission unit 106 included in the in-vehicle device 100. The LF transmission unit 106 includes, for example, a signal generation circuit 1061, an amplification circuit 1062, a switch circuit 1063, and a phase inversion circuit 1064.
　信号生成回路１０６１は、制御部１０１から入力される信号に基づき、送信すべき信号を生成する。信号生成回路１０６１にて生成された信号は、後段の増幅回路１０６２に入力され、増幅回路１０６２にて信号が増幅される。 The signal generation circuit 1061 generates a signal to be transmitted based on the signal input from the control unit 101. The signal generated by the signal generation circuit 1061 is input to the subsequent amplification circuit 1062, and the signal is amplified by the amplification circuit 1062.
　スイッチ回路１０６３には、制御部１０１から入力される一定周期の切替信号が入力される。スイッチ回路１０６３は、入力される切替信号に従って、出力先を位相反転回路１０６４を経由しない経路と、出力先を位相反転回路１０６４を経由する経路とに交互に切り替える。スイッチ回路１０６３により位相反転回路１０６４を経由しない経路が選択された場合、増幅回路１０６２にて増幅された信号は、位相が反転されずに各ＬＦ送信アンテナ１０６ａ～１０６ｅへ出力される。一方、スイッチ回路１０６３により位相反転回路１０６４を経由する経路が選択された場合、増幅回路１０６２にて増幅された信号は、位相反転回路１０６４にて位相が反転（位相が１８０度変更）され、位相反転後の信号が各ＬＦ送信アンテナ１０６ａ～１０６ｅへ出力される。 The switch circuit 1063 receives a switching signal having a constant period input from the control unit 101. The switch circuit 1063 alternately switches the output destination to a path that does not pass through the phase inversion circuit 1064 and an output destination that passes through the phase inversion circuit 1064 according to the input switching signal. When the switch circuit 1063 selects a path that does not pass through the phase inverter circuit 1064, the signal amplified by the amplifier circuit 1062 is output to each of the LF transmission antennas 106a to 106e without the phase being inverted. On the other hand, when the path through the phase inverter circuit 1064 is selected by the switch circuit 1063, the phase of the signal amplified by the amplifier circuit 1062 is inverted (the phase is changed by 180 degrees) by the phase inverter circuit 1064. The inverted signal is output to each LF transmitting antenna 106a to 106e.
　図５は車載装置１００及び携帯機２００が送受信するＬＦ信号を説明する説明図である。図５Ａは、車載装置１００から送信されるＬＦ信号（送信信号）の一例を示している。上述したように、車載装置１００のＬＦ送信部１０６は、ＬＦ信号を送信する際に所定周期で位相反転を行う。図５Ａに示した例では、ＬＦ送信アンテナ１０６ａ～１０６ｅから送信されるＬＦ信号に係る電波が、１つの周期に対応する期間Ａと、期間Ａに続く期間Ｂとの間で１８０度異なる位相を持つ様子を示している。 FIG. 5 is an explanatory diagram for explaining LF signals transmitted and received by the in-vehicle device 100 and the portable device 200. FIG. 5A shows an example of an LF signal (transmission signal) transmitted from the in-vehicle device 100. As described above, the LF transmission unit 106 of the in-vehicle device 100 performs phase inversion at a predetermined cycle when transmitting the LF signal. In the example shown in FIG. 5A, the radio waves related to the LF signals transmitted from the LF transmitting antennas 106a to 106e have phases different by 180 degrees between the period A corresponding to one period and the period B following the period A. It shows how to hold it.
　図５Ｂは、携帯機２００のＬＦ受信部２０５にて受信したＬＦ信号（受信信号）の一例を示している。車両Ｃの周辺に環境ノイズが発生している場合、携帯機２００のＬＦ受信部２０５にて受信する受信信号は、車載装置１００のＬＦ送信部１０６から送信されるＬＦ信号に対して環境ノイズが重畳された信号となる。なお、図５Ｂの例では、説明のために、ＬＦ信号（太線）と環境ノイズ（細線）とを分離して示している。 FIG. 5B shows an example of an LF signal (received signal) received by the LF receiver 205 of the portable device 200. When environmental noise is generated around the vehicle C, the received signal received by the LF receiver 205 of the portable device 200 is more environmental noise than the LF signal transmitted from the LF transmitter 106 of the in-vehicle device 100. The signal is superimposed. In the example of FIG. 5B, for the sake of explanation, the LF signal (thick line) and the environmental noise (thin line) are shown separately.
　携帯機２００の制御部２０１は、ＬＦ受信部２０５が信号を受信した場合、期間Ａに対応する信号から期間Ｂに対応する信号を減算する処理を行う。図５Ｃは、減算処理後のＬＦ信号の一例を示している。環境ノイズは、送信対象のＬＦ信号と特定の位相関係を有する信号でない場合（例えばホワイトノイズの場合）、制御部２０１で実行する減算処理によって増幅されることはなく、相対的に小さな値に変換される。よって、制御部２００が実行する減算処理により、環境ノイズを低減することができる。 When the LF receiving unit 205 receives a signal, the control unit 201 of the portable device 200 performs a process of subtracting the signal corresponding to the period B from the signal corresponding to the period A. FIG. 5C shows an example of the LF signal after the subtraction process. When the environmental noise is not a signal having a specific phase relationship with the transmission target LF signal (for example, white noise), the environmental noise is not amplified by the subtraction processing executed by the control unit 201 and is converted into a relatively small value. Is done. Therefore, environmental noise can be reduced by the subtraction processing executed by the control unit 200.
　図６は携帯機２００が実行する処理の手順を説明するフローチャートである。携帯機２００の制御部２０１は、上述した期間ＡのＬＦ信号をＬＦ受信部２０５にて受信したか否かを判断する（ステップＳ１０１）。受信していない場合（Ｓ１０１：ＮＯ）、制御部２０１は、期間Ａに対応するＬＦ信号を受信するまで待機する。 FIG. 6 is a flowchart for explaining a procedure of processing executed by the portable device 200. The control unit 201 of the portable device 200 determines whether or not the LF reception unit 205 has received the LF signal for the period A described above (step S101). If not received (S101: NO), the control unit 201 waits until an LF signal corresponding to the period A is received.
　期間Ａに対応するＬＦ信号を受信したと判断した場合（Ｓ１０１：ＹＥＳ）、制御部２０１は、受信したＬＦ信号を記憶部２０２に記憶させる（ステップＳ１０２）。 When it is determined that the LF signal corresponding to the period A has been received (S101: YES), the control unit 201 stores the received LF signal in the storage unit 202 (step S102).
　次いで、制御部２０１は、期間Ａに続く期間Ｂに対応したＬＦ信号（すなわち、車載装置１００側で位相反転されたＬＦ信号）をＬＦ受信部２０５にて受信したか否かを判断する（ステップＳ１０３）。受信していない場合（Ｓ１０３：ＮＯ）、制御部２０１は、期間Ｂに対応するＬＦ信号を受信するまで待機する。 Next, the control unit 201 determines whether or not the LF reception unit 205 has received an LF signal corresponding to a period B following the period A (that is, an LF signal whose phase has been inverted on the vehicle-mounted device 100 side) (step S1201). S103). If not received (S103: NO), the control unit 201 waits until an LF signal corresponding to the period B is received.
　期間Ｂに対応するＬＦ信号を受信したと判断した場合（Ｓ１０３：ＹＥＳ）、制御部２０１は、ステップＳ１０２で記憶部２０２に記憶させた期間ＡのＬＦ信号から、ステップＳ１０３で受信した期間ＢのＬＦ信号を減算する減算処理を実行する（ステップＳ１０４）。 When it is determined that the LF signal corresponding to the period B has been received (S103: YES), the control unit 201 uses the LF signal for the period B received in step S103 from the LF signal for the period A stored in the storage unit 202 in step S102. A subtraction process for subtracting the LF signal is executed (step S104).
　次いで、制御部２０１は、減算処理後の信号に基づいて、ＬＦ信号の信号強度を算出する（ステップＳ１０５）。このとき、制御部２０１は、ステップＳ１０４の減算処理で得られる信号の振幅値を２で除算し、期間Ａに対応するＬＦ信号の信号強度と期間Ｂに対応するＬＦ信号の信号強度との平均値を求めてもよい。 Next, the control unit 201 calculates the signal strength of the LF signal based on the signal after the subtraction process (step S105). At this time, the control unit 201 divides the amplitude value of the signal obtained by the subtraction process in step S104 by 2, and averages the signal strength of the LF signal corresponding to the period A and the signal strength of the LF signal corresponding to the period B. A value may be obtained.
　次いで、制御部２０１は、算出した信号強度の情報を含むＲＦ信号を送信するためにＲＦ送信部２０４を制御し、ＲＦ送信部２０４よりＲＦ信号を外部へ送信する（ステップＳ１０６）。 Next, the control unit 201 controls the RF transmission unit 204 to transmit an RF signal including information on the calculated signal strength, and transmits the RF signal to the outside from the RF transmission unit 204 (step S106).
　車載装置１００は、携帯機２００から送信されるＲＦ信号をＲＦ受信部１０５にて受信することにより、携帯機２００にて計測されたＬＦ信号の信号強度を取得することができる。携帯機２００では環境ノイズが低減された状態で信号強度が計測されているため、車載装置１００は、その信号強度に基づいて携帯機２００の位置検出を実行することにより、携帯機２００の位置を精度良く検出することができ、携帯機２００が車内に存在するのか、車外に存在するのかを正確に判定することが可能となる。 The in-vehicle device 100 can acquire the signal strength of the LF signal measured by the portable device 200 by receiving the RF signal transmitted from the portable device 200 by the RF receiving unit 105. Since the signal strength is measured with the environmental noise reduced in the portable device 200, the in-vehicle device 100 detects the position of the portable device 200 based on the signal strength, thereby determining the position of the portable device 200. It is possible to detect with high accuracy, and it is possible to accurately determine whether the portable device 200 exists inside the vehicle or outside the vehicle.
　今回開示された実施の形態は、全ての点で例示であって、制限的なものではないと考えられるべきである。本発明の範囲は、上述した意味ではなく、請求の範囲によって示され、請求の範囲と均等の意味及び範囲内での全ての変更が含まれることが意図される。 The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
　１００　車載装置
　１０１　制御部
　１０２　記憶部
　１０３　入出力部
　１０４　車内通信部
　１０５　ＲＦ受信部（車載側受信部）
　１０６　ＬＦ送信部（車載側送信部）
　１１１　ドアロック機構
　１１２　ドアロック操作部
　２００　携帯機
　２０１　制御部（減算部、算出部）
　２０２　記憶部
　２０３　操作部
　２０３ａ　アンロックボタン
　２０３ｂ　ロックボタン
　２０４　ＲＦ送信部（携帯側送信部）
　２０５　ＬＦ受信部（携帯側受信部）
　１６０１　信号生成回路
　１６０２　増幅回路
　１６０３　スイッチ回路
　１６０４　信号反転回路 DESCRIPTION OF SYMBOLS 100 In-vehicle apparatus 101 Control part 102 Storage part 103 Input / output part 104 In-vehicle communication part 105 RF receiving part (on-vehicle side receiving part)
106 LF transmitter (on-vehicle transmitter)
111 Door Lock Mechanism 112 Door Lock Operation Unit 200 Portable Machine 201 Control Unit (Subtraction Unit, Calculation Unit)
202 Storage Unit 203 Operation Unit 203a Unlock Button 203b Lock Button 204 RF Transmitter (Portable Transmitter)
205 LF receiver (portable receiver)
1601 Signal generation circuit 1602 Amplifier circuit 1603 Switch circuit 1604 Signal inversion circuit

Claims (4)

  1. 　車両に搭載された車載装置と、該車載装置と無線通信が可能である携帯機とを備え、前記車載装置と前記携帯機との間で無線通信を行うことにより、前記車載装置にて前記携帯機の位置を検出する車載通信システムであって、
    　前記車載装置は、
    　互いに位相が１８０度異なる２種類の検出信号を交互に送信する車載側送信部と、
    　該車載側送信部が送信した前記検出信号に対して前記携帯機から送信される応答信号を受信する車載側受信部と、
    　該車載側受信部にて受信した応答信号に基づき、前記携帯機の位置を検出する位置検出部と
    　を備え、
    　前記携帯機は、
    　前記車載側送信部から送信される２種類の検出信号を受信する携帯機側受信部と、
    　受信した２種類の検出信号の一方から他方を減算する減算部と、
    　該減算部により減算して得られる信号に基づき、前記携帯機側受信部が受信した前記検出信号の信号強度を算出する算出部と、
    　該算出部により算出した信号強度の情報を含む応答信号を送信する携帯機側送信部と
    　を備える車載通信システム。     An in-vehicle device mounted on a vehicle and a portable device capable of wireless communication with the in-vehicle device, and performing the wireless communication between the in-vehicle device and the portable device, the portable device An in-vehicle communication system for detecting the position of a machine,
    The in-vehicle device is
    An in-vehicle transmission unit that alternately transmits two types of detection signals that are 180 degrees out of phase with each other;
    An in-vehicle side receiving unit that receives a response signal transmitted from the portable device in response to the detection signal transmitted by the in-vehicle side transmitting unit;
    A position detection unit that detects the position of the portable device based on the response signal received by the in-vehicle side reception unit;
    The portable device is
    A portable device-side receiver that receives two types of detection signals transmitted from the in-vehicle-side transmitter;
    A subtractor for subtracting the other from one of the two types of received detection signals;
    Based on the signal obtained by subtraction by the subtracting unit, a calculating unit that calculates the signal strength of the detection signal received by the portable device-side receiving unit;
    An in-vehicle communication system comprising: a portable device-side transmitter that transmits a response signal including information on the signal strength calculated by the calculator.
  2. 　前記車載側送信部は、
    　送信すべき信号の位相を１８０度変更する位相反転器と、
    　該位相反転器を経由する経路と、前記位相反転器を経由しない経路とを所定周期で切り替えるスイッチと
    　を備える請求項１に記載の車載通信システム。     The in-vehicle side transmitter is
    A phase inverter that changes the phase of the signal to be transmitted by 180 degrees;
    The in-vehicle communication system according to claim 1, further comprising: a switch that switches a path that passes through the phase inverter and a path that does not pass through the phase inverter at a predetermined period.
  3. 　携帯機との間で無線通信を行うことにより、前記携帯機の位置を検出する車載装置であって、
    　互いに位相が１８０度異なる２種類の検出信号を交互に送信する送信部と、
    　該送信部が送信した前記検出信号に対して前記携帯機から送信される応答信号を受信する受信部と、
    　該受信部にて受信した応答信号に基づき、前記携帯機の位置を検出する位置検出部と
    　を備える車載装置。     An in-vehicle device that detects the position of the portable device by performing wireless communication with the portable device,
    A transmission unit that alternately transmits two types of detection signals whose phases are different from each other by 180 degrees;
    A receiving unit that receives a response signal transmitted from the portable device in response to the detection signal transmitted by the transmitting unit;
    A vehicle-mounted apparatus comprising: a position detection unit that detects a position of the portable device based on a response signal received by the reception unit.
  4. 　車載装置と無線通信を行う携帯機であって、
    　前記車載装置から交互に送信され、互いに位相が１８０度異なる２種類の検出信号を受信する受信部と、
    　受信した２種類の検出信号の一方から他方を減算する減算部と、
    　該減算部により減算して得られる信号に基づき、前記受信部が受信した前記検出信号の信号強度を算出する算出部と、
    　該算出部により算出した信号強度の情報を含む応答信号を送信する送信部と
    　を備える携帯機。     A portable device that performs wireless communication with an in-vehicle device,
    A reception unit that receives two types of detection signals that are alternately transmitted from the in-vehicle device and that are 180 degrees out of phase with each other;
    A subtractor for subtracting the other from one of the two types of received detection signals;
    A calculation unit that calculates a signal strength of the detection signal received by the reception unit based on a signal obtained by subtraction by the subtraction unit;
    A portable device comprising: a transmission unit that transmits a response signal including information on the signal strength calculated by the calculation unit.
PCT/JP2017/031685 2016-09-07 2017-09-04 Vehicle-mounted communication system, vehicle-mounted device and portable apparatus WO2018047748A1 (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11122317A (en) * 1997-10-17 1999-04-30 Nec Eng Ltd Carrier recovery device
JP2010181295A (en) * 2009-02-06 2010-08-19 Alps Electric Co Ltd Mobile device for vehicle
US20110102138A1 (en) * 2009-10-30 2011-05-05 Lear Corporation System And Method For Authorizing A Remote Device
JP2012145506A (en) * 2011-01-13 2012-08-02 Omron Automotive Electronics Co Ltd Detector, detection system and detection method for electric wave transmitter/acceptor
JP2012237103A (en) * 2011-05-10 2012-12-06 Nippon Soken Inc Smart system and mobile unit for smart system
JP2013068033A (en) * 2011-09-26 2013-04-18 Omron Automotive Electronics Co Ltd Radio communication equipment and communication control method
WO2014033975A1 (en) * 2012-08-29 2014-03-06 株式会社デンソー Vehicle door locked state control system
JP2014123434A (en) * 2012-12-20 2014-07-03 Tokyo Parts Ind Co Ltd Proximity sensor and door device
WO2015145497A1 (en) * 2014-03-24 2015-10-01 パナソニックＩｐマネジメント株式会社 Vehicular near field communication system, portable device, and on-board instrument

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11122317A (en) * 1997-10-17 1999-04-30 Nec Eng Ltd Carrier recovery device
JP2010181295A (en) * 2009-02-06 2010-08-19 Alps Electric Co Ltd Mobile device for vehicle
US20110102138A1 (en) * 2009-10-30 2011-05-05 Lear Corporation System And Method For Authorizing A Remote Device
JP2012145506A (en) * 2011-01-13 2012-08-02 Omron Automotive Electronics Co Ltd Detector, detection system and detection method for electric wave transmitter/acceptor
JP2012237103A (en) * 2011-05-10 2012-12-06 Nippon Soken Inc Smart system and mobile unit for smart system
JP2013068033A (en) * 2011-09-26 2013-04-18 Omron Automotive Electronics Co Ltd Radio communication equipment and communication control method
WO2014033975A1 (en) * 2012-08-29 2014-03-06 株式会社デンソー Vehicle door locked state control system
JP2014123434A (en) * 2012-12-20 2014-07-03 Tokyo Parts Ind Co Ltd Proximity sensor and door device
WO2015145497A1 (en) * 2014-03-24 2015-10-01 パナソニックＩｐマネジメント株式会社 Vehicular near field communication system, portable device, and on-board instrument

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