JP5619223B1 - Wireless communication system - Google Patents

Wireless communication system Download PDF

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Publication number
JP5619223B1
JP5619223B1 JP2013140301A JP2013140301A JP5619223B1 JP 5619223 B1 JP5619223 B1 JP 5619223B1 JP 2013140301 A JP2013140301 A JP 2013140301A JP 2013140301 A JP2013140301 A JP 2013140301A JP 5619223 B1 JP5619223 B1 JP 5619223B1
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vehicle
portable device
area
antenna
outside
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JP2015013527A (en
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平墳 浩司
浩司 平墳
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20Means to switch the anti-theft system on or off
    • B60R25/24Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05BLOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B49/00Electric permutation locks; Circuits therefor ; Mechanical aspects of electronic locks; Mechanical keys therefor
    • H04W4/04
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W64/00Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10Small scale networks; Flat hierarchical networks

Abstract

【課題】携帯機の車内外判定を、少ないアンテナ個数かつ汎用性高い単純なロジックで、精度良く行うことの出来る無線通信システムを得る。【解決手段】携帯機2が車両100の車外もしくは車外の近くの車内にあるかを、車外認証用のLF送信アンテナ31b、31c、31eからの検知エリア310b、310c、310eにより判定し、携帯機2が車外もしくは車外の近くの車内に有るときとないときで、車内用のLF送信アンテナ31aの検知エリアを決める判定閾値を変更するようにしている。【選択図】図1A wireless communication system capable of accurately determining the inside / outside of a portable device with a simple logic with a small number of antennas and high versatility. Whether a portable device 2 is outside the vehicle 100 or inside the vehicle in the vicinity of the vehicle is determined by detection areas 310b, 310c, 310e from LF transmission antennas 31b, 31c, 31e for vehicle outside authentication, and the portable device The determination threshold value for determining the detection area of the in-vehicle LF transmission antenna 31a is changed depending on whether or not 2 is in the vehicle outside or in the vehicle near the vehicle outside. [Selection] Figure 1

Description

この発明は、車両に搭載された車載無線通信装置(以下、「車載機」という)と、ユーザによって携帯される携帯無線通信装置(以下、「携帯機」という)とを備えた無線通信システムに関し、特に、少ない車内LF送信アンテナ数で精度良く携帯機の車内外判定が出来るスマートキーレスエントリシステムを実現するための技術に関するものである。   The present invention relates to a wireless communication system including an in-vehicle wireless communication device (hereinafter referred to as “on-vehicle device”) mounted on a vehicle and a portable wireless communication device (hereinafter referred to as “portable device”) carried by a user. In particular, the present invention relates to a technique for realizing a smart keyless entry system capable of accurately determining whether a portable device is in or out of a vehicle with a small number of in-vehicle LF transmitting antennas.

従来から、車両のドアの施錠や解錠を、ユーザの携帯機からの遠隔操作によって行うキーレスエントリシステムが知られている。また、携帯機を操作することなく、ドアの施錠や解錠を行うスマートキーレスエントリシステムもよく知られている(たとえば、特許文献1参照)。   2. Description of the Related Art Conventionally, a keyless entry system that locks and unlocks a door of a vehicle by a remote operation from a user's portable device is known. A smart keyless entry system that locks and unlocks a door without operating a portable device is also well known (see, for example, Patent Document 1).

特許文献1においては、車載機および携帯機を有するキーレスエントリシステムにおいて、携帯機に内蔵されたRSSI(Received Signal Strength Indicator:受信信号強度測定器)機能を使用して、携帯機とLF送信アンテナとの距離を測定し、あらかじめ定められた距離閾値を超えるか否かに応じて、携帯機が車内に有ると判断したときだけ車両の駆動動力源(エンジンやモータ)の始動操作を許可したり、車外よりドアを施錠しようとしたとき携帯機が車内に有ると閉じ込めに対する警告を発したりする。   In patent document 1, in a keyless entry system having an in-vehicle device and a portable device, an RSSI (Received Signal Strength Indicator) function built in the portable device is used, and the portable device, the LF transmission antenna, , And depending on whether or not the predetermined distance threshold is exceeded, only when it is determined that the portable device is in the vehicle, the start operation of the driving power source (engine or motor) of the vehicle is permitted, When you try to lock the door from outside the car, if the portable device is inside the car, you will be warned about the confinement.

特開2006−319845号公報JP 2006-31845 A

スマートキーレスエントリシステムは、携帯機の車内外判定が正確でないと誤った動作をしてしまう。車内判定の距離閾値が長過ぎると、携帯機が車内にあると判断する距離が伸びて、携帯機が車外にあるにも関わらず車内にあると判定してしまうことがある。距離閾値が短過ぎると携帯機が車内にあるのに車内にないと誤判定してしまう。   The smart keyless entry system performs an incorrect operation unless the inside / outside determination of the portable device is accurate. If the distance threshold for in-vehicle determination is too long, the distance for determining that the portable device is in the vehicle may be extended, and it may be determined that the portable device is in the vehicle even though the portable device is outside the vehicle. If the distance threshold is too short, it is erroneously determined that the portable device is in the vehicle but not in the vehicle.

よって、車外に検知エリアがはみ出し過ぎないように距離閾値を短めに調整した小さめの検知エリアを車内に並べ、何れかの検知エリアに携帯機が有れば、車内に携帯機が有ると判定している。この場合、使用する検知エリアの数だけ車内にLF送信アンテナを設けることが必要になる。   Therefore, a small detection area with a short distance threshold adjusted so that the detection area does not protrude outside the vehicle is arranged in the vehicle, and if there is a portable device in any of the detection areas, it is determined that there is a portable device in the vehicle. ing. In this case, it is necessary to provide LF transmitting antennas in the vehicle as many as the number of detection areas to be used.

別の方法として、複数のLF送信アンテナからの磁束強度RSSI値を携帯機で読取り、それらを距離に換算して幾何学演算などを行い、携帯機が車内か否かを判断する方法もあるが、マッチングが複雑であったり、誤判定がないことの検証に多大な時間を要してしまうことが多い。   As another method, there is a method of reading out magnetic flux intensity RSSI values from a plurality of LF transmitting antennas with a portable device, converting them into a distance, performing geometric calculation, etc., and determining whether the portable device is in a vehicle. In many cases, it takes a lot of time to verify that the matching is complicated or that there is no erroneous determination.

また、最小限のアンテナ数で車内外判定の精度を追求するマッチングを行うと多大な工数を要してしまう。また、車両形状に合せて厳密な合せ込みを行うと別の車種には当てはまらなくなり汎用性がなくなるなどの問題がある。   In addition, if matching is performed in pursuit of the accuracy of in-vehicle / out-of-vehicle determination with the minimum number of antennas, a great amount of man-hours are required. In addition, there is a problem that, when strict fitting is performed according to the shape of the vehicle, it cannot be applied to another vehicle type and the versatility is lost.

以上のように、携帯機位置の車内外判定の精度を高くすることと、LF送信アンテナの個数やマッチング工数で生じるコストを削減することは相反する。車種毎の汎用性を持た
せることは更に困難である。よって、現状では何れかの条件を犠牲にして、工業製品として成立させている。
As described above, there is a contradiction between increasing the accuracy of the in-vehicle determination of the position of the portable device and reducing the cost caused by the number of LF transmitting antennas and the matching man-hours. It is more difficult to provide versatility for each vehicle type. Therefore, at present, it is established as an industrial product at the expense of any condition.

このように、携帯機の車内外判定の精度向上のためには、LF送信アンテナの個数を増やす必要があり、コストが上がるという課題があった。また、少ないLF送信アンテナで携帯機の車内外判定の精度を上げるために、複数のアンテナからの距離を基に幾何計算などを行い車内判定エリアを形成する手段も考えられるが、所望のエリア形状を得るための合わせ込みや検知範囲の性能検証に多大な工数が掛かってしまうという課題があった。さらにまた、少ないLF送信アンテナで車内判定の精度を上げようと細かな合せ込みをし過ぎると、車種毎の汎用性がなくなってしまうという課題があった。   As described above, in order to improve the accuracy of the in-vehicle / out-of-vehicle determination of the portable device, it is necessary to increase the number of LF transmitting antennas, and there is a problem that the cost increases. In addition, in order to increase the accuracy of in-vehicle / outside determination of a portable device with a small number of LF transmission antennas, a means for forming an in-vehicle determination area by performing geometric calculation based on distances from a plurality of antennas may be considered. There is a problem that a great amount of man-hours are required for the alignment for obtaining the performance and the performance verification of the detection range. Furthermore, there has been a problem that the versatility of each vehicle type is lost if fine adjustment is performed to increase the accuracy of in-vehicle determination with a small number of LF transmitting antennas.

この発明は、上記のような課題を解決するためになされたものであり、少ない車内用アンテナ個数で、かつ、汎用性が低く複雑な演算ロジックを用いずに、精度の高い携帯機の車内外判定が可能な無線通信システムを提供することを目的とする。   The present invention has been made in order to solve the above-described problems, and has a small number of in-vehicle antennas and is not highly versatile and does not use complicated arithmetic logic. An object of the present invention is to provide a wireless communication system capable of determination.

この発明に係る無線通信システムは、車両に搭載された無線通信機能を有する車載機と、前記車両のユーザによって携帯され、前記車載機との間で無線通信を行なう機能を有する携帯機とにより構成される無線通信システムであって、前記車載機は、車載機CPUと、認証コードを記憶する車載機メモリと、電界強度測定用信号および認証要求信号を前記携帯機に送信するLF送信回路および複数のLF送信アンテナと、前記携帯機からの認証応答信号を受信する受信回路とを備え、前記車載機CPUは、前記携帯機から受信した認証応答信号に含まれる認証コードと、前記車載機メモリ内の認証コードとの照合を行い、前記携帯機は、携帯機CPUと、前記認証コードを記憶する携帯機メモリと、前記電界強度測定用信号および前記認証要求信号を受信する受信アンテナおよびLF受信回路と、前記電界強度測定用信号の受信電界強度を測定する電界強度測定回路と、前記携帯機メモリ内の認証コード、前記認証応答信号および受信電界強度信号を前記車載機に送信する送信回路とを備え、前記LF送信アンテナは、前記携帯機が車内にあることを判定するLF送信アンテナ(第1のアンテナ)と前記携帯機が車外もしくは車外に近い車内にあることを判定するLFアンテナ(第2のアンテナ)とからなり、前記車載機CPUは、前記第2のアンテナの判定結果に基づき、前記第1のアンテナによるエリア判定の閾値を切替え、その閾値に基づく検知エリア内に前記携帯機が存在するかどうかにより前記携帯機が車内にあるか否かを判断するようにしたものである。 A wireless communication system according to the present invention includes an in-vehicle device having a wireless communication function mounted on a vehicle and a portable device carried by a user of the vehicle and having a function of performing wireless communication with the on-vehicle device. The in-vehicle device includes an in-vehicle device CPU, an in-vehicle device memory that stores an authentication code, an LF transmission circuit that transmits an electric field strength measurement signal and an authentication request signal to the portable device, and a plurality of in-vehicle devices. and LF transmitting antenna, said a receiving circuit for receiving an authentication response signal from the portable device, the vehicle device CPU includes an authentication code included in the authentication response signal received from the portable device, the vehicle-mounted device memory The portable device includes a portable device CPU, a portable device memory that stores the authentication code, the electric field strength measurement signal, and the authentication requirement. A receiving antenna and an LF receiving circuit for receiving a signal, an electric field strength measuring circuit for measuring a received electric field strength of the electric field strength measuring signal, an authentication code in the portable device memory, the authentication response signal, and the received electric field strength signal. A transmission circuit for transmitting to the in-vehicle device, wherein the LF transmission antenna is an LF transmission antenna (first antenna) for determining that the portable device is in a vehicle and the portable device is in a vehicle outside or near the outside of the vehicle. The in- vehicle device CPU switches the threshold value for area determination by the first antenna based on the determination result of the second antenna, and sets the threshold value to the threshold value. Whether or not the portable device is in the vehicle is determined based on whether or not the portable device is present in the detection area .

この発明によれば、スマートキーレスエントリシステムなどに適用される無線通信システムにおいて、少ない車内アンテナ個数で、携帯機位置の車内外判定を精度良く、多大なコストを要することなく実現することができる。   According to the present invention, in a wireless communication system applied to a smart keyless entry system or the like, it is possible to accurately determine the position of a portable device inside and outside a vehicle with a small number of in-vehicle antennas without requiring much cost.

この発明の実施の形態1に係る無線通信システム(スマートキーレスエントリシステム)を概略的に示す平面構成図である。1 is a plan configuration diagram schematically showing a wireless communication system (smart keyless entry system) according to Embodiment 1 of the present invention; FIG. 図1の車載機の回路構成を示すブロック図である。It is a block diagram which shows the circuit structure of the vehicle equipment of FIG. 図1の携帯機の回路構成を示すブロック図である。It is a block diagram which shows the circuit structure of the portable device of FIG. 1個のLF送信アンテナで携帯機の車内判定をするとき、車外を車内と誤判定する範囲を許容範囲内に抑えた場合の車内判定エリアを示す図である。It is a figure which shows the in-vehicle determination area at the time of restraining the range which misdetermines that the outside of a vehicle is in-vehicle in the tolerance | permissible range, when determining in-vehicle of a portable device with one LF transmission antenna. 1個のLF送信アンテナで携帯機の車内判定をするとき、車内に不検知領域が発生しないようにした場合の車内判定エリアを示す図である。It is a figure which shows the in-vehicle determination area at the time of making a non-detection area | region not generate | occur | produce in a vehicle, when determining the in-vehicle of a portable machine with one LF transmission antenna. 携帯機の車内判定をするとき、車外を車内と誤判定する範囲を許容範囲内に抑え、かつ車内に不検知領域が発生しないように、2個のLF送信アンテナで車内判定した場合の車内エリアを示す図である。In-vehicle area when two LF transmission antennas are used to determine the inside of a portable device so that the range of erroneously determining that the outside of the vehicle is in-vehicle is within the allowable range and no undetected area is generated in the vehicle. FIG. 携帯機が車外もしくは車外に近い車内に有ると判断するエリアを示す図である。It is a figure which shows the area which judges that there exists a portable machine in the vehicle exterior or vehicle exterior. 携帯機が図7の判定エリアに有り、車外を車内と誤判定し難いように、車内判定を図4の判定エリアで行っている様子を示す図である。It is a figure which shows a mode that in-vehicle determination is performed in the determination area of FIG. 4 so that a portable device may exist in the determination area of FIG. 携帯機が図7の判定エリアになく、車外を車内と誤判定する可能性がないので、車内判定を図5の判定エリアで行っている様子を示す図である。It is a figure which shows a mode that in-vehicle determination is performed in the determination area of FIG. 5, since there is no possibility that the portable device is not in the determination area of FIG. 1個のLF送信アンテナで携帯機の車内判定をするとき、車外を車内と誤判定する範囲を許容範囲内に抑えた場合の車内判定エリアを示す図である。It is a figure which shows the in-vehicle determination area at the time of restraining the range which misdetermines that the outside of a vehicle is in-vehicle in the tolerance | permissible range, when determining in-vehicle of a portable device with one LF transmission antenna. 1個のLF送信アンテナで携帯機の車内判定をするとき、車内に不検知領域が発生しないようにした場合の車内判定エリアを示す図である。It is a figure which shows the in-vehicle determination area at the time of making a non-detection area | region not generate | occur | produce in a vehicle, when determining the in-vehicle of a portable machine with one LF transmission antenna. 携帯機が車外もしくは車外に近い車内に有ると判断するエリアを示す図である。It is a figure which shows the area which judges that there exists a portable machine in the vehicle exterior or vehicle exterior. 携帯機が図12の判定エリアに有り、車外を車内と誤判定し難いように、車内判定を図10の判定エリアで行っている様子を示す図である。It is a figure which shows a mode that in-vehicle determination is performed in the determination area of FIG. 10 so that a portable device exists in the determination area of FIG. 携帯機が図12の判定エリアになく、車外を車内と誤判定する可能性がないので、車内判定を図11の判定エリアで行っている様子を示す図であるIt is a figure which shows a mode that the vehicle interior determination is performed in the determination area of FIG. 11, since there is no possibility that the portable device is not in the determination area of FIG. 1個のLF送信アンテナで携帯機の車内判定をするとき、車外を車内と誤判定する範囲を許容範囲内に抑えた場合の車内判定エリアを示す図である。It is a figure which shows the in-vehicle determination area at the time of restraining the range which misdetermines that the outside of a vehicle is in-vehicle in the tolerance | permissible range, when determining in-vehicle of a portable device with one LF transmission antenna. 1個のLF送信アンテナで携帯機の車内判定をするとき、車内に不検知領域が発生しないようにした場合の車内判定エリアを示す図である。It is a figure which shows the in-vehicle determination area at the time of making a non-detection area | region not generate | occur | produce in a vehicle, when determining the in-vehicle of a portable machine with one LF transmission antenna. 携帯機が車外もしくは車外に近い車内に有ると判断するエリアを示す図である。It is a figure which shows the area which judges that there exists a portable machine in the vehicle exterior or vehicle exterior. 携帯機が図17の判定エリアに有り、車外を車内と誤判定し難いように、車内判定を図15の判定エリアで行っている様子を示す図である。It is a figure which shows a mode that in-vehicle determination is performed in the determination area of FIG. 15 so that a portable device exists in the determination area of FIG. 携帯機が図17の判定エリアになく、車外を車内と誤判定する可能性がないので、車内判定を図16の判定エリアで行っている様子を示す図である。FIG. 18 is a diagram illustrating a state in which in-vehicle determination is performed in the determination area of FIG. 16 because there is no possibility that the portable device is not in the determination area of FIG.

実施の形態1.
以下、図1〜図3を参照しながら、この発明の実施の形態1に係る無線通信システムについて、スマートキーレスエントリシステムの場合を例にとって詳細に説明する。
Embodiment 1 FIG.
Hereinafter, the radio communication system according to Embodiment 1 of the present invention will be described in detail with reference to FIGS. 1 to 3 by taking the case of a smart keyless entry system as an example.

図1は、この発明の実施の形態1に係るスマートキーレスエントリシステムを概略的に示す平面構成図である。図1において、スマートキーレスエントリシステムは、概して、車両100に搭載された車載機1と、車両100のユーザ200が携帯する携帯機2とにより構成される。車両100には、車載機1と協働する他の回路要素として、制御装置4と、LF送信アンテナ31a〜31eと、RF受信アンテナ32と、リクエストスイッチ33a、33b、33cと、スタートスイッチ34とが設けられている。   FIG. 1 is a plan view schematically showing a smart keyless entry system according to Embodiment 1 of the present invention. In FIG. 1, the smart keyless entry system generally includes an in-vehicle device 1 mounted on a vehicle 100 and a portable device 2 carried by a user 200 of the vehicle 100. In the vehicle 100, as other circuit elements that cooperate with the vehicle-mounted device 1, a control device 4, LF transmission antennas 31a to 31e, an RF reception antenna 32, request switches 33a, 33b, and 33c, a start switch 34, Is provided.

車載機1は、RF受信アンテナ32を介して、携帯機2からの遠隔操作信号を受信した際に、制御装置4を介してドアの解錠操作または施錠操作などを行う。また、車載機1は、ユーザ200によるドアの開閉動作や、リクエストスイッチ33a、33b、33cまたはスタートスイッチ34の操作に応答して、LF送信アンテナ31a〜31eから携帯機2に対してLF信号の近距離送信を行い、携帯機2の位置検知などを行う。   When the vehicle-mounted device 1 receives a remote operation signal from the portable device 2 via the RF receiving antenna 32, the vehicle-mounted device 1 performs an unlocking operation or a locking operation of the door via the control device 4. Further, the in-vehicle device 1 responds to the opening / closing operation of the door by the user 200 or the operation of the request switches 33a, 33b, 33c or the start switch 34, and transmits the LF signal from the LF transmission antennas 31a to 31e to the portable device 2. Short-distance transmission is performed, and the position of the portable device 2 is detected.

LF送信アンテナ31a〜31eは、車両100の車室内、左右ドア部および後部に設置されており、リクエストスイッチ33a、33b、33cは、ユーザ200が操作しやすいように車両100の左右ドア部および後部に設置されている。   The LF transmission antennas 31a to 31e are installed in the vehicle interior, left and right door portions, and the rear portion of the vehicle 100, and the request switches 33a, 33b, and 33c are the left and right door portions and the rear portion of the vehicle 100 so that the user 200 can easily operate them. Is installed.

LF送信アンテナ31a〜31eは、携帯機2に対して無線送信を行う。RF受信アンテナ32は、携帯機2からの無線送信を受信する。リクエストスイッチ33a、33b、33cは、ユーザ200の施錠および開錠の意思を受け付け、また、スタートスイッチ34は、ユーザ200の操作によるエンジン始動や走行スタンバイ状態への移行要求を受け付ける。制御装置4は、車両100のイグニッションスイッチ(図示せず)に関する制御を行うとともに、車両100のドアの施錠および解錠を制御する。   The LF transmission antennas 31 a to 31 e perform wireless transmission with respect to the portable device 2. The RF receiving antenna 32 receives wireless transmission from the portable device 2. The request switches 33a, 33b, and 33c accept the user 200's intention to lock and unlock, and the start switch 34 accepts a request for engine start or a transition to a running standby state by the operation of the user 200. The control device 4 controls the ignition switch (not shown) of the vehicle 100 and controls the locking and unlocking of the door of the vehicle 100.

図1に示したスマートキーレスエントリシステムにおいて、車載機1は、携帯機2から送られてくる信号を受信し、受信信号の内容に応じて、イグニッション操作の許可または禁止を判定し、制御装置4に対してイグニション操作の許可または禁止を指示する。また、車載機1は、携帯機2からの受信信号の内容に応じて、ドアの施錠または解錠を判定し、制御装置4に対してドアの施錠または解錠を指示する。   In the smart keyless entry system shown in FIG. 1, the in-vehicle device 1 receives a signal sent from the portable device 2, determines whether the ignition operation is permitted or prohibited according to the content of the received signal, and controls the control device 4. Is instructed to permit or prohibit ignition operation. The in-vehicle device 1 determines whether the door is locked or unlocked according to the content of the received signal from the portable device 2 and instructs the control device 4 to lock or unlock the door.

なお、以下の説明において、車載機1から携帯機2への通信は、LF通信方式(Low Frequency Communication Method)を使用し、変調処理後の信号を使用するものとする。一方、携帯機2から車載機1への通信は、代表的に、最も一般的なRF通信方式(Radio Frequency Communication Method)を使用し、変調処理後の信号を使用するものとする。   In the following description, communication from the in-vehicle device 1 to the portable device 2 uses an LF communication method (Low Frequency Communication Method) and uses a signal after modulation processing. On the other hand, communication from the portable device 2 to the vehicle-mounted device 1 typically uses the most common RF communication method (Radio Frequency Communication Method) and uses a signal after modulation processing.

図2は図1に示す車載機1の回路構成を示すブロック図であり、前述(図1参照)と同様のものについては、前述と同一符号を付して詳述を省略する。図2において、車載機1は、各種演算処理機能を有する車載機CPU10(以下、単に「CPU10」という)と、CPU10に属するROMおよびRAMを含む車載機メモリ11(以下、単に「メモリ11」という)と、LF送信回路12と、RF受信回路13と、スイッチ入力回路17とを備えている。   FIG. 2 is a block diagram showing a circuit configuration of the vehicle-mounted device 1 shown in FIG. 1. The same components as those described above (see FIG. 1) are denoted by the same reference numerals as those described above, and detailed description thereof is omitted. In FIG. 2, an in-vehicle device 1 includes an in-vehicle device CPU 10 (hereinafter simply referred to as “CPU 10”) having various arithmetic processing functions, and an in-vehicle device memory 11 (hereinafter simply referred to as “memory 11”) including a ROM and a RAM belonging to the CPU 10. ), An LF transmission circuit 12, an RF reception circuit 13, and a switch input circuit 17.

CPU10には、LF送信回路12を介してLF送信アンテナ31a〜31eが接続され、RF受信回路13を介してRF受信アンテナ32が接続され、また、スイッチ入力回路17を介してリクエストスイッチ33a、33b、33cおよびスタートスイッチ34が接続されている。   The CPU 10 is connected to the LF transmission antennas 31 a to 31 e via the LF transmission circuit 12, the RF reception antenna 32 is connected via the RF reception circuit 13, and the request switches 33 a and 33 b via the switch input circuit 17. 33c and the start switch 34 are connected.

メモリ11内には、携帯機2から送信されてくる認証応答信号のデータを認証する(後述する認証コード220の照合を行う)ための認証コード110が記憶されており、メモリ11は、受信データの認証時に認証コード110をCPU10に入力する。   The memory 11 stores an authentication code 110 for authenticating data of an authentication response signal transmitted from the portable device 2 (verifying an authentication code 220 described later). The memory 11 stores received data The authentication code 110 is input to the CPU 10 at the time of authentication.

CPU10は、車載機1の統合的な制御を行い、あらかじめメモリ11に記憶されたプログラムを実行することにより各種機能を実現する。   The CPU 10 performs integrated control of the in-vehicle device 1 and realizes various functions by executing programs stored in the memory 11 in advance.

LF送信回路12は、変調回路121および増幅回路122を備えている。LF送信回路12内の変調回路121は、CPU10からの送信信号(電界強度測定用信号および認証要求信号)をLF周波数帯の搬送波で変調し、変調後の送信信号を生成する。また、LF送信回路12内の増幅回路122は、変調回路121により変調された上記送信信号を増幅してLF送信アンテナ31a〜31eに送る。   The LF transmission circuit 12 includes a modulation circuit 121 and an amplification circuit 122. The modulation circuit 121 in the LF transmission circuit 12 modulates a transmission signal (electric field strength measurement signal and authentication request signal) from the CPU 10 with a carrier wave in the LF frequency band, and generates a modulated transmission signal. The amplifier circuit 122 in the LF transmission circuit 12 amplifies the transmission signal modulated by the modulation circuit 121 and sends it to the LF transmission antennas 31a to 31e.

LF送信アンテナ31a〜31eは、増幅後の送信信号を気中に送信する。5つのLF送信アンテナ31a〜31eは、図1に示す位置に配置されている。LF送信アンテナ31aは、車両100の車室内101への送信に使用され、他の3つのLF送信アンテナ31b、31c、31eは、車両100の車外への送信に使用される。残りのLF送信アンテナ31dは予備で、アンテナ31aと同様に車両100の車室内にあり、アンテナ31aだけでは車両100の車室内101の全域を検知出来ないときに使用される。   The LF transmission antennas 31a to 31e transmit the amplified transmission signals to the air. The five LF transmission antennas 31a to 31e are arranged at the positions shown in FIG. The LF transmission antenna 31a is used for transmission to the vehicle interior 101 of the vehicle 100, and the other three LF transmission antennas 31b, 31c, and 31e are used for transmission of the vehicle 100 to the outside of the vehicle. The remaining LF transmission antenna 31d is a spare, and is used when the entire area of the vehicle interior 101 of the vehicle 100 cannot be detected by the antenna 31a alone, like the antenna 31a.

RF受信回路13は、RF復調回路131および増幅回路132を備えている。RF受信回路13内の増幅回路132は、気中の無線信号を受信するRF受信アンテナ32に接続され、RF受信アンテナ32から入力される受信信号を増幅する。RF復調回路131は、増幅後の受信信号を復調し、得られた復調信号をCPU10に入力する。   The RF reception circuit 13 includes an RF demodulation circuit 131 and an amplification circuit 132. The amplification circuit 132 in the RF reception circuit 13 is connected to the RF reception antenna 32 that receives the air signal in the air, and amplifies the reception signal input from the RF reception antenna 32. The RF demodulation circuit 131 demodulates the amplified received signal and inputs the obtained demodulated signal to the CPU 10.

図2は図1に示す携帯機2の回路構成を示すブロック図であり、CPU20は、携帯機2の統合的な制御を行い、あらかじめメモリ22内に記憶されたプログラムを実行することにより各種機能を実現する。メモリ22内のROMには、認証コード220があらかじめ記憶されている。認証コード220は、携帯機2から車載機1への送信時に、車載機1において携帯機2を認証する(認証コード110と照合する)ために必要なデータである。   FIG. 2 is a block diagram showing a circuit configuration of the portable device 2 shown in FIG. 1. The CPU 20 performs integrated control of the portable device 2 and executes various programs by executing programs stored in the memory 22 in advance. Is realized. An authentication code 220 is stored in advance in the ROM in the memory 22. The authentication code 220 is data necessary for authenticating the portable device 2 in the in-vehicle device 1 (verifying with the authentication code 110) when transmitting from the portable device 2 to the in-vehicle device 1.

RF送信回路23は、CPU20からの送信信号に基づき、RF周波数帯の搬送波を変調した送信信号(認証コード220、認証応答信号および電界強度測定値)を生成し、RF送信アンテナ25は、RF送信回路23からの上記送信信号を気中に送信する。なお、ここでは図示を省略するが、RF送信回路23は、CPU20からの送信信号をRF周波数帯の搬送波で変調する変調回路と、変調後の送信信号を増幅する増幅回路とを備えている。   The RF transmission circuit 23 generates a transmission signal (an authentication code 220, an authentication response signal, and an electric field strength measurement value) obtained by modulating a carrier wave in the RF frequency band based on the transmission signal from the CPU 20, and the RF transmission antenna 25 performs RF transmission. The transmission signal from the circuit 23 is transmitted to the air. Although not shown here, the RF transmission circuit 23 includes a modulation circuit that modulates a transmission signal from the CPU 20 with a carrier wave in an RF frequency band and an amplification circuit that amplifies the modulated transmission signal.

LF通信回路24内のLF受信回路240は、増幅回路2400と、復調回路2401と、RSSI(Received Signal Strength Indicator)回路2402とを備えている。増幅回路2400およびRSSI回路2402は、それぞれ、各受信アンテナ26a〜26cに対応して並列構成されているものとする。   The LF reception circuit 240 in the LF communication circuit 24 includes an amplification circuit 2400, a demodulation circuit 2401, and an RSSI (Received Signal Strength Indicator) circuit 2402. It is assumed that the amplifier circuit 2400 and the RSSI circuit 2402 are configured in parallel corresponding to the respective reception antennas 26a to 26c.

増幅回路2400は、気中の無線信号を受信するアンテナ26a〜26cからの受信信号を増幅する。復調回路2401は、増幅後の受信信号を復調し、得られた復調信号をCPU20に入力する。RSSI回路2402は、増幅回路2400での増幅度合いに基づき、各アンテナ26a〜26cの受信電界強度(RSSI値)を測定し、受信電界強度信号をCPU20に入力する。   The amplifier circuit 2400 amplifies the reception signals from the antennas 26a to 26c that receive the air signal in the air. The demodulating circuit 2401 demodulates the amplified received signal and inputs the obtained demodulated signal to the CPU 20. The RSSI circuit 2402 measures the received electric field strength (RSSI value) of each of the antennas 26 a to 26 c based on the degree of amplification in the amplifier circuit 2400 and inputs the received electric field strength signal to the CPU 20.

入力回路21は、携帯機2のユーザ200による操作入力(ドアやトランクを施錠または解錠する操作入力など)を検出し、操作入力に応じた信号をCPU20に入力する。   The input circuit 21 detects an operation input (such as an operation input for locking or unlocking a door or a trunk) by the user 200 of the portable device 2 and inputs a signal corresponding to the operation input to the CPU 20.

以下に、この発明の実施の形態における、携帯機の車内外判定方法について説明するが、この際、携帯機と車載機の交信の詳細は上述した通りなので説明を省略し、車載機のLF送信アンテナと携帯機の受信電界強度(RSSI値)との関係に注目し携帯機が車内にあるか車外にあるかの判断に絞って説明する。   In the following, a method for determining whether the portable device is inside or outside the vehicle according to the embodiment of the present invention will be described. At this time, since the details of the communication between the portable device and the vehicle-mounted device are as described above, the description is omitted and the LF transmission of the vehicle-mounted device is performed. Focusing on the relationship between the antenna and the received electric field strength (RSSI value) of the portable device, the description will be focused on determining whether the portable device is inside or outside the vehicle.

ここで、この発明の実施の形態1による携帯機2の車内外判定方法の原理について説明する。図4においてLF送信アンテナ31aは、携帯機2が車内にあるか車外にあるかを判定するいわゆる車内外判定用で、車室内101の中央付近に設置されている。アンテナ31aからの出力に対して、携帯機2での受信電界強度(RSSI値)が、所定の閾値TH1を超える車内エリアを310aで示す。閾値TH1は、車内エリア310aが、右側車内エリア到達許容限界102および左側車内エリア到達許容限界103より外に到達しないような高い閾値に設定する。車室内101の中には車内エリア310aでは携帯機2が検知出来ない箇所が存在する。   Here, the principle of the inside / outside determination method of the portable device 2 according to Embodiment 1 of the present invention will be described. In FIG. 4, the LF transmission antenna 31 a is a so-called vehicle interior / exterior determination for determining whether the portable device 2 is inside or outside the vehicle, and is installed near the center of the vehicle interior 101. A vehicle interior area 310a in which the received electric field strength (RSSI value) in the portable device 2 exceeds the predetermined threshold value TH1 with respect to the output from the antenna 31a is indicated by 310a. The threshold value TH1 is set to a high threshold value such that the in-vehicle area 310a does not reach outside the right in-vehicle area reachable limit 102 and the left in-vehicle area reachable limit 103. There is a portion in the vehicle interior 101 where the portable device 2 cannot be detected in the vehicle interior area 310a.

一方、図5においてもLF送信アンテナ31aは車内外判定用で、図4と同じ位置に設置されている。アンテナ31aからの出力に対して、携帯機2でのRSSI値が、所定の閾値TH2を超える車内エリアを311aで示す。閾値TH2は車内エリア311aが、
車室内101の全域を検知出来る閾値TH1より低い値に設定する。車内エリア311aは右側車内エリア到達許容限界102もしくは左側車内エリア到達許容限界103を超過する箇所が存在する。
On the other hand, in FIG. 5, the LF transmission antenna 31a is used for in-vehicle / out-of-vehicle determination, and is installed at the same position as in FIG. An in-vehicle area where the RSSI value in the portable device 2 exceeds a predetermined threshold value TH2 with respect to the output from the antenna 31a is indicated by 311a. The threshold value TH2 is determined by the in-car area 311a.
It is set to a value lower than the threshold value TH1 that can detect the entire area of the vehicle interior 101. In the vehicle interior area 311 a, there are places where the right vehicle interior area reachable limit 102 or the left vehicle interior reachable limit 103 is exceeded.

このように多くの車両の形状では1個のLF送信アンテナで車室内101全域を検知し、かつ右側車内エリア到達許容限界102および左側車内エリア到達許容限界103より外に到達しないようにすることは困難である。   Thus, in many vehicle shapes, it is not possible to detect the entire vehicle interior 101 with one LF transmission antenna and prevent the vehicle interior from reaching the right vehicle interior area reachable limit 102 and the left vehicle interior reachable limit 103. Have difficulty.

よって、従来、多くの場合は、図6に示すように、車室内101の前寄りにLF送信アンテナ31aを、後寄りにLF送信アンテナ31dを設置している。アンテナ31aからの出力に対して、携帯機2での受信電界強度(RSSI値)が、所定の閾値TH3を超える車内エリアを312aで示す。閾値TH3は車内エリア312aが、右側車内エリア到達許容限界102および左側車内エリア到達許容限界103より外に到達しないような値に設定する。また、アンテナ31dからの出力に対して、携帯機2での受信電界強度(RSSI値)が、所定の閾値TH4を超える車内エリアを310dで示す。閾値TH4は車内エリア310dが、右側車内エリア到達許容限界102および左側車内エリア到達許容限界103より外に到達しないような値に設定する。車内エリア312aと車内エリア310dのいずれかで携帯機2が検出されるエリアにて車室内101全域を検出している。しかしこの方法では、車室内に2個のアンテナを設置する必要がある。   Therefore, conventionally, in many cases, as shown in FIG. 6, the LF transmission antenna 31a is installed at the front side of the vehicle interior 101, and the LF transmission antenna 31d is installed at the rear side. A vehicle interior area where the received electric field strength (RSSI value) in the portable device 2 exceeds the predetermined threshold TH3 with respect to the output from the antenna 31a is indicated by 312a. The threshold value TH3 is set to a value such that the in-vehicle area 312a does not reach outside the right in-vehicle area reachable limit 102 and the left in-vehicle area reachable limit 103. In addition, a vehicle interior area where the received electric field strength (RSSI value) in the portable device 2 exceeds a predetermined threshold value TH4 with respect to the output from the antenna 31d is indicated by 310d. The threshold value TH4 is set to a value such that the in-vehicle area 310d does not reach outside the right in-vehicle area reachable limit 102 and the left in-vehicle area reachable limit 103. The entire vehicle interior 101 is detected in an area where the portable device 2 is detected in either the vehicle interior area 312a or the vehicle interior area 310d. However, in this method, it is necessary to install two antennas in the vehicle interior.

図7〜図9は本発明の方法を説明するものである。図7において、車両100の左右ドア部に設置されたLF送信アンテナ31b、31cは、本来は車外の所定エリア内に携帯機2が有るかどうかを判断し、施錠/開錠の許可を行うための車外判定用アンテナであるが、本発明ではLF送信アンテナ31b、31cからの出力磁束を、携帯機2が車外もしくは車外に近い車内エリアに有るかどうかの判定に用いる。   7-9 illustrate the method of the present invention. In FIG. 7, the LF transmission antennas 31b and 31c installed at the left and right door portions of the vehicle 100 originally determine whether or not the portable device 2 is in a predetermined area outside the vehicle and permit the locking / unlocking. However, in the present invention, the output magnetic flux from the LF transmitting antennas 31b and 31c is used to determine whether or not the portable device 2 is outside the vehicle or in an in-vehicle area.

アンテナ31bからの出力に対して、携帯機2での受信電界強度(RSSI値)が、所定の閾値TH5を超える車外寄り判断エリアを310bで示す。閾値TH5は車外寄り判断エリアが、車室内101内において車内エリアを310aで検知出来ないエリアには到達しないように設定する。また、アンテナ31cについてもアンテナ31bと同様に、アンテナ31cからの出力に対して、携帯機2での受信電界強度(RSSI値)が、所定の閾値TH6を超える車外寄り判断エリアを310cで示す。閾値TH6は車外寄り判断エリアが、車室内101内において車内エリア310aで検知出来ないエリアには到達しないように設定する。   An out-of-vehicle determination area 310b in which the received electric field strength (RSSI value) in the portable device 2 exceeds the predetermined threshold value TH5 with respect to the output from the antenna 31b is indicated by 310b. The threshold value TH5 is set so that the vehicle exterior determination area does not reach an area in the vehicle interior 101 where the vehicle interior area cannot be detected by 310a. Similarly to the antenna 31b, the antenna 31c also indicates an out-of-vehicle determination area 310c in which the received electric field strength (RSSI value) in the portable device 2 exceeds the predetermined threshold value TH6 with respect to the output from the antenna 31c. The threshold value TH6 is set so that the vehicle outside determination area does not reach an area in the vehicle interior 101 that cannot be detected by the vehicle interior area 310a.

図8は、携帯機2が車外寄り判断エリア310bまたは310cに有る場合の動作の説明である。携帯機2がLF送信アンテナ31b、31cの車外寄り判断エリア310bもしくは310cにあると、LF送信アンテナ31aからの出力に対して、携帯機2でのRSSI値がエリア判定閾値TH1を超えた場合(車内エリア310a内)、携帯機2が車内に有ると判断する。   FIG. 8 is a diagram illustrating the operation when the portable device 2 is in the vehicle out-of-vehicle determination area 310b or 310c. When the portable device 2 is in the vehicle outside determination area 310b or 310c of the LF transmission antennas 31b and 31c, when the RSSI value in the portable device 2 exceeds the area determination threshold TH1 with respect to the output from the LF transmission antenna 31a ( It is determined that the portable device 2 is in the vehicle area 310a).

図9は携帯機2が車外寄り判断エリア310bまたは310cにない場合の動作の説明である。携帯機2がLF送信アンテナ31b、31cの車外寄り判断エリア310bもしくは310cにないと、LF送信アンテナ31aのエリア判定閾値をTH1より低いTH2に切替えて、LF送信アンテナ31aからの出力に対して、携帯機2でのRSSI値のエリア判定閾値がエリア判定閾値TH2を超えた場合(車内エリア311a内)、携帯機2が車内に有ると判断する。   FIG. 9 illustrates the operation when the portable device 2 is not in the vehicle outside determination area 310b or 310c. If the portable device 2 is not in the vehicle outside judgment area 310b or 310c of the LF transmission antennas 31b and 31c, the area judgment threshold of the LF transmission antenna 31a is switched to TH2 lower than TH1, and the output from the LF transmission antenna 31a is When the area determination threshold value of the RSSI value in the portable device 2 exceeds the area determination threshold value TH2 (in the in-car area 311a), it is determined that the portable device 2 is in the car.

次に、携帯機の別の車内外判定方法の原理および本発明の別の判断方法を図10〜図14で説明する。図10においてLF送信アンテナ31aは車内外判定用で、車室内101の中央付近の後寄りに設置されている。アンテナ31aからの出力に対して、携帯機2での受信電界強度(RSSI値)が、所定の閾値TH7を超える車内エリアを313aで示す。閾値TH7は、車内エリア313aが、後方車内エリア到達許容限界104より外に到達しないような高い値に設定される。車室内101の中には車内エリア313aでは検知出来ていない箇所が存在する。   Next, the principle of another in-vehicle / outside determination method of the portable device and another determination method of the present invention will be described with reference to FIGS. In FIG. 10, the LF transmission antenna 31 a is used for in-vehicle / out-of-vehicle determination and is installed near the center of the vehicle interior 101. A vehicle interior area where the received electric field strength (RSSI value) in the portable device 2 exceeds the predetermined threshold TH7 with respect to the output from the antenna 31a is indicated by 313a. The threshold value TH7 is set to a high value such that the in-vehicle area 313a does not reach outside the rear in-vehicle area reachable limit 104. In the vehicle interior 101, there is a portion that cannot be detected in the vehicle interior area 313a.

図11において、LF送信アンテナ31aは車内外判定用で、図10と同じ位置に設置されている。アンテナ31aからの出力に対して、携帯機2でのRSSI値が、所定の閾値TH8を超える車内エリアを314aで示す。閾値TH8は、車内エリア314aが、車室内101の全域を検知出来るようなTH7より低い値に設定する。車内エリア314aは後方車内エリア到達許容限界104を超過する箇所が存在する。   In FIG. 11, the LF transmission antenna 31a is used for in-vehicle / out-of-vehicle determination and is installed at the same position as in FIG. An in-vehicle area where the RSSI value in the portable device 2 exceeds a predetermined threshold TH8 with respect to the output from the antenna 31a is indicated by 314a. The threshold value TH8 is set to a value lower than TH7 so that the vehicle interior area 314a can detect the entire interior of the vehicle interior 101. The vehicle interior area 314 a has a location that exceeds the rear vehicle interior area reachable limit 104.

このように多くの車両の形状では1個のLF送信アンテナで車室内101全域を検知し、かつ後方車内エリア到達許容限界104より外に到達しないようにすることは困難である。よって、前述の図6に示すように、車室内101に2個のLF送信アンテナを設置し、対策することが必要であった。   Thus, in many vehicle shapes, it is difficult to detect the entire vehicle interior 101 with one LF transmission antenna and not to reach the rear vehicle interior area reachable limit 104. Therefore, as shown in FIG. 6 described above, it is necessary to install two LF transmitting antennas in the vehicle interior 101 and take countermeasures.

図12においてLF送信アンテナ31eは、本来は車外の所定エリア内に携帯機2が有るかを車載機1で判断し、施錠/開錠の許可を行うための車外判定用アンテナであるが、本発明ではLF送信アンテナ31eからの出力磁束を、携帯機2が車外もしくは車外に近い車内エリアに有るかの判定に用いる。アンテナ31eからの出力に対して、携帯機2での受信電界強度(RSSI値)が、所定の閾値TH9を超える車外寄り判断エリアを310eで示す。閾値TH9は車外寄り判断エリアが、車室内101内において車内エリア313aで検知出来ないエリアには到達しないように設定する。   In FIG. 12, the LF transmission antenna 31e is a vehicle outside determination antenna for judging whether or not the mobile device 2 is originally in a predetermined area outside the vehicle, and permitting locking / unlocking. In the present invention, the output magnetic flux from the LF transmission antenna 31e is used to determine whether the portable device 2 is outside the vehicle or in an in-vehicle area close to the outside of the vehicle. An out-of-vehicle determination area 310e in which the received electric field strength (RSSI value) in the portable device 2 exceeds a predetermined threshold TH9 with respect to the output from the antenna 31e is indicated by 310e. The threshold value TH9 is set so that the vehicle outside determination area does not reach an area in the vehicle interior 101 that cannot be detected by the vehicle interior area 313a.

図13は携帯機2が車外寄り判断エリア310eに有る場合の動作の説明である。携帯機2がLF送信アンテナ31eの車外寄り判断エリア310eにあると、LF送信アンテナ31aからの出力に対して、携帯機2でのRSSI値がエリア判定閾値TH7を超えた場合(車内エリア313a内)、携帯機2が車内に有ると判断する。   FIG. 13 is a diagram illustrating the operation when the portable device 2 is in the vehicle outside determination area 310e. When the portable device 2 is in the out-of-vehicle determination area 310e of the LF transmission antenna 31e, the RSSI value in the portable device 2 exceeds the area determination threshold TH7 with respect to the output from the LF transmission antenna 31a (in the in-vehicle area 313a) ), It is determined that the portable device 2 is in the vehicle.

図14は携帯機2が車外寄り判断エリア310eにない場合の動作の説明である。携帯機2がLF送信アンテナ31eの車外寄り判断エリア310eにないと、LF送信アンテナ31aからの出力に対して、携帯機2でのRSSI値がエリア判定閾値をTH7より低いTH8に切替え、TH8を超えた場合(車内エリア314a内)、携帯機2が車内に有ると判断する。   FIG. 14 is a diagram for explaining the operation when the portable device 2 is not in the vehicle outside determination area 310e. If the portable device 2 is not in the out-of-vehicle determination area 310e of the LF transmission antenna 31e, the RSSI value in the portable device 2 switches the area determination threshold to TH8 lower than TH7 with respect to the output from the LF transmission antenna 31a. When it exceeds (in the vehicle area 314a), it is determined that the portable device 2 is in the vehicle.

次に、携帯機のさらに別の車内外判定方法の原理および本発明のさらに別の判断方法を図15〜図19で説明する。図15において、LF送信アンテナ31aは車内外判定用で、車室内101の中央付近の後寄りに設置されている。アンテナ31aからの出力に対して、携帯機2での受信電界強度(RSSI値)が、所定の閾値TH10を超える車内エリアを315aで示す。閾値TH10は、車内エリア315aが、右側車内エリア到達許容限界102もしくは左側車内エリア到達許容限界103もしくは後方車内エリア到達許容限界104より外に到達しないような高い値に設定する。車室内101の中には車内エリア315aでは検知出来ていない箇所が存在する。   Next, the principle of another in-vehicle / outside determination method of the portable device and another determination method of the present invention will be described with reference to FIGS. In FIG. 15, the LF transmission antenna 31 a is used for in-vehicle / out-of-vehicle determination, and is installed near the center of the vehicle interior 101. A vehicle interior area where the received electric field strength (RSSI value) in the portable device 2 exceeds the predetermined threshold value TH10 with respect to the output from the antenna 31a is indicated by 315a. The threshold value TH10 is set to a high value such that the in-vehicle area 315a does not reach outside the right in-vehicle area reachable limit 102, the left in-vehicle area reachable limit 103, or the rear in-vehicle area reachable limit 104. There is a portion in the vehicle interior 101 that cannot be detected in the vehicle interior area 315a.

図16においても、LF送信アンテナ31aは車内外判定用で、図15と同じ位置に設置されている。アンテナ31aからの出力に対して、携帯機2でのRSSI値が、所定の閾値TH11を超える車内エリアを316aで示す。閾値TH11は、車内エリア316aが車室内101の全域を検知出来る低い値に設定される。車内エリア316aは、右側車内エリア到達許容限界102もしくは左側車内エリア到達許容限界103もしくは後方
車内エリア到達許容限界104を超過する箇所が存在する。
Also in FIG. 16, the LF transmission antenna 31a is used for in-vehicle / out-of-vehicle determination and is installed at the same position as in FIG. An in-vehicle area where the RSSI value in the portable device 2 exceeds a predetermined threshold value TH11 with respect to the output from the antenna 31a is indicated by 316a. The threshold value TH11 is set to a low value that allows the vehicle interior area 316a to detect the entire interior of the vehicle interior 101. In the in-vehicle area 316a, there are places where the right in-vehicle area reachable limit 102, the left in-vehicle area reachable limit 103, or the rear in-vehicle area reachable limit 104 is exceeded.

このように多くの車両の形状では1個のLF送信アンテナで車室内101全域を検知し、かつ右側車内エリア到達許容限界102および左側車内エリア到達許容限界103および後方車内エリア到達許容限界104より外に到達しないようにすることは困難である。よって、前述の図6に示すように、車室内101に2個のLF送信アンテナを設置し、対策することが必要であった。   Thus, in many vehicle shapes, the entire vehicle interior 101 is detected by one LF transmission antenna, and the vehicle interior area reachable limit 102 on the right side, the vehicle area reachable limit 103 on the left side, and the vehicle interior reachable limit 104 on the rear side are outside. It is difficult to avoid reaching. Therefore, as shown in FIG. 6 described above, it is necessary to install two LF transmitting antennas in the vehicle interior 101 and take countermeasures.

図17においてLF送信アンテナ31b、31c、31eは、本来は車外の所定エリア内に携帯機2が有るかを判断し施錠/開錠の許可を行うための車外判定用アンテナであるが、本発明ではLF送信アンテナ31b、31c、31eからの出力磁束を、携帯機2が車外もしくは車外に近い車内エリアに有るかの判定に用いる。アンテナ31bからの出力に対して、携帯機2での受信電界強度(RSSI値)が、所定の閾値TH12を超える車外寄り判断エリアを311bで示す。閾値TH12は車外寄り判断エリアが、車室内101内において車内エリア315aで検知出来ないエリアには到達しないように設定する。   In FIG. 17, the LF transmission antennas 31b, 31c, and 31e are originally outside-vehicle determination antennas for determining whether or not the portable device 2 is in a predetermined area outside the vehicle and permitting locking / unlocking. Then, the output magnetic flux from the LF transmission antennas 31b, 31c, and 31e is used to determine whether the portable device 2 is in the vehicle interior area or outside the vehicle. A vehicle out-of-vehicle determination area where the received electric field strength (RSSI value) in the portable device 2 exceeds the predetermined threshold TH12 with respect to the output from the antenna 31b is indicated by 311b. The threshold value TH12 is set so that the vehicle exterior determination area does not reach an area that cannot be detected by the vehicle interior area 315a in the vehicle interior 101.

アンテナ31cについてもアンテナ31bと同様に、アンテナ31cからの出力に対して、携帯機2での受信電界強度(RSSI値)が、所定の閾値TH13を超える車外寄り判断エリアを311cで示す。閾値TH13は車外寄り判断エリアが、車室内101内において車内エリア315aで検知出来ないエリアには到達しないように設定する。   Similarly to the antenna 31b, the antenna 31c also indicates an out-of-vehicle determination area 311c where the received electric field strength (RSSI value) in the portable device 2 exceeds the predetermined threshold TH13 with respect to the output from the antenna 31c. The threshold value TH13 is set so that the vehicle outside determination area does not reach an area in the vehicle interior 101 that cannot be detected by the vehicle interior area 315a.

更にアンテナ31eについてもアンテナ31bと同様に、アンテナ31eからの出力に対して、携帯機2での受信電界強度(RSSI値)が、所定の閾値TH14を超える車外寄り判断エリアを311eで示す。閾値TH14は、車外寄り判断エリアが車室内101内において車内エリア315aで検知出来ないエリアには到達しないように設定する。   Further, similarly to the antenna 31b, the antenna 31e is indicated by 311e as an out-of-vehicle determination area where the received electric field strength (RSSI value) in the portable device 2 exceeds the predetermined threshold TH14 with respect to the output from the antenna 31e. The threshold value TH14 is set so that the vehicle outside determination area does not reach an area in the vehicle interior 101 that cannot be detected by the vehicle interior area 315a.

図18は、携帯機2が車外寄り判断エリア311bもしくは311cもしくは311eに有る場合の動作の説明である。携帯機2がLF送信アンテナ31b、31c、31eの車外寄り判断エリア311bもしくは311cもしくは311eにあると、LF送信アンテナ31aからの出力に対して、携帯機2でのRSSI値がエリア判定閾値をTH10を超えた場合(車内エリア315a内)、携帯機2が車内に有ると判断する。   FIG. 18 is an explanatory diagram of the operation when the portable device 2 is in the vehicle outside determination area 311b, 311c, or 311e. When the portable device 2 is in the vehicle out-of-vehicle determination area 311b, 311c, or 311e of the LF transmission antennas 31b, 31c, 31e, the RSSI value in the portable device 2 has an area determination threshold value TH10 with respect to the output from the LF transmission antenna 31a. Is exceeded (within the vehicle interior area 315a), it is determined that the portable device 2 is in the vehicle.

図19は、携帯機2が車外寄り判断エリア311bもしくは311cもしくは311eにない場合の動作の説明である。携帯機2がLF送信アンテナ31b、31c、31eの車外寄り判断エリア311bもしくは311cもしくは311eにないと、LF送信アンテナ31aからの出力に対して、携帯機2でのRSSI値のエリア判定閾値がTH11を超えた場合(車内エリア316a内)、携帯機2が車内に有ると判断する。   FIG. 19 is a diagram illustrating the operation when the portable device 2 is not in the vehicle out-of-vehicle determination area 311b, 311c, or 311e. If the portable device 2 is not in the vehicle out-of-vehicle determination area 311b, 311c, or 311e of the LF transmission antennas 31b, 31c, 31e, the area determination threshold value of the RSSI value in the portable device 2 is TH11 with respect to the output from the LF transmission antenna 31a. Is exceeded (inside the in-car area 316a), it is determined that the portable device 2 is in the car.

以上のように、この発明の実施の形態1によれば、スマートキーレエントリスシステムなどに適用される無線通信システムにおいて、最小の車内アンテナ個数で、携帯機位置の車内外判定を精度良く、多大なコストを要することなく実現することができる。   As described above, according to the first embodiment of the present invention, in a wireless communication system applied to a smart key reentry system or the like, it is possible to accurately determine the inside / outside of a portable device with a minimum number of in-vehicle antennas. This can be realized without requiring a high cost.

以上、この発明を実施の形態により説明したが、この発明は、その発明の範囲内において、実施の形態を適宜、変形することが可能である。   Although the present invention has been described above by the embodiments, the present invention can be modified as appropriate within the scope of the invention.

1 車載機、 2 携帯機、 4 制御装置、
10 CPU、 11 メモリ、 12 LF送信回路、
13 RF受信回路、 17 スイッチ入力回路、 20 CPU、
21 入力回路、 22 メモリ、 23 RF送信回路、
24 LF通信回路、 25 RF送信アンテナ、
26a〜26c アンテナ(LF受信アンテナ)、
26a0〜26c0 コイル、
31a〜31e LF送信アンテナ、
32 RF受信アンテナ、 33a、33b、33c リクエストスイッチ、
34 スタートスイッチ、 100 車両、 101 車室内、
102 右側車内エリア到達許容限界、
103 左側車内エリア到達許容限界、
104 後方車内エリア到達許容限界、 110 認証コード、
121 変調回路、 122 増幅回路、 131 RF復調回路、
132 増幅回路、 200 ユーザ、 220 認証コード、
240 LF受信回路、 243 メモリ、
310a、311a、312a、313a、314a、315a、316a、310d 車内アンテナエリア、
310b、310c、310e、311b、311c、311e 車外寄り判断エリア、
2400 増幅回路、 2401 LF復調回路、
2402 RSSI回路。
1 in-vehicle device, 2 portable device, 4 control device,
10 CPU, 11 memory, 12 LF transmission circuit,
13 RF receiver circuit, 17 switch input circuit, 20 CPU,
21 input circuit, 22 memory, 23 RF transmission circuit,
24 LF communication circuit, 25 RF transmitting antenna,
26a-26c antenna (LF receiving antenna),
26a0-26c0 coil,
31a-31e LF transmitting antenna,
32 RF receiving antennas, 33a, 33b, 33c request switch,
34 Start switch, 100 vehicles, 101 passenger compartment,
102 Right side car area reachable limit,
103 Left side in-car area reachable limit,
104 Rear vehicle area reachable limit, 110 Authentication code,
121 modulation circuit, 122 amplification circuit, 131 RF demodulation circuit,
132 amplifier circuit, 200 users, 220 authentication code,
240 LF receiver circuit, 243 memory,
310a, 311a, 312a, 313a, 314a, 315a, 316a, 310d Car interior antenna area,
310b, 310c, 310e, 311b, 311c, 311e
2400 amplifier circuit, 2401 LF demodulator circuit,
2402 RSSI circuit.

Claims (3)

車両に搭載された無線通信機能を有する車載機と、前記車両のユーザによって携帯され、前記車載機との間で無線通信を行なう機能を有する携帯機とにより構成される無線通信システムであって、前記車載機は、車載機CPUと、認証コードを記憶する車載機メモリと、電界強度測定用信号および認証要求信号を前記携帯機に送信するLF送信回路および複数のLF送信アンテナと、前記携帯機からの認証応答信号を受信する受信回路とを備え、前記車載機CPUは、前記携帯機から受信した認証応答信号に含まれる認証コードと、前記車載機メモリ内の認証コードとの照合を行い、前記携帯機は、携帯機CPUと、前記認証コードを記憶する携帯機メモリと、前記電界強度測定用信号および前記認証要求信号を受信する受信アンテナおよびLF受信回路と、前記電界強度測定用信号の受信電界強度を測定する電界強度測定回路と、前記携帯機メモリ内の認証コード、前記認証応答信号および受信電界強度信号を前記車載機に送信する送信回路とを備え、前記LF送信アンテナは、前記携帯機が車内にあることを判定するLF送信アンテナ(第1のアンテナ)と前記携帯機が車外もしくは車外に近い車内にあることを判定するLFアンテナ(第2のアンテナ)とからなり、前記車載機CPUは、前記第2のアンテナの判定結果に基づき、前記第1のアンテナによるエリア判定の閾値を切替え、その閾値に基づく検知エリア内に前記携帯機が存在するかどうかにより前記携帯機が車内にあるか否かを判断するようにしたことを特徴とする無線通信システム。 A wireless communication system comprising a vehicle-mounted device having a wireless communication function mounted on a vehicle and a portable device carried by a user of the vehicle and having a function of performing wireless communication with the vehicle-mounted device, The in-vehicle device includes an in-vehicle device CPU, an in-vehicle device memory for storing an authentication code, an LF transmission circuit and a plurality of LF transmission antennas for transmitting an electric field strength measurement signal and an authentication request signal to the portable device, and the portable device. A reception circuit for receiving an authentication response signal from the vehicle-mounted device CPU, the authentication code included in the authentication response signal received from the portable device and the verification code in the vehicle-mounted device memory, The portable device includes a portable device CPU, a portable device memory that stores the authentication code, a reception antenna that receives the electric field strength measurement signal and the authentication request signal, and F receiving circuit, electric field strength measuring circuit for measuring the received electric field strength of the electric field strength measuring signal, and transmission for transmitting the authentication code, the authentication response signal and the received electric field strength signal in the portable device memory to the in-vehicle device And an LF transmission antenna that determines whether the portable device is in a vehicle and a LF antenna that determines whether the portable device is in or near the outside of the vehicle. The in- vehicle device CPU switches the area determination threshold value by the first antenna based on the determination result of the second antenna, and the mobile device CPU is within the detection area based on the threshold value. A wireless communication system characterized in that it is determined whether or not the portable device is in a vehicle depending on whether or not a device is present . 前記携帯機が車外もしくは車外の近くの車内に有るかどうかの判断には、車載機に備えられ、車外からの施錠・開錠操作に対して携帯機との認証通信を行うLF送信アンテナを用いることを特徴とする請求項1に記載の無線通信システム。   For determining whether the portable device is outside the vehicle or in the vicinity of the outside of the vehicle, an LF transmission antenna provided in the on-vehicle device and performing authentication communication with the portable device for locking / unlocking operation from outside the vehicle is used. The wireless communication system according to claim 1. 前記携帯機が車外もしくは車外に近い車内にあると判定する検知エリアは、前記第1のアンテナによるエリア判定の閾値を下げて車内の検知可能としたいエリアを含まないように設定することを特徴とする請求項1に記載の無線通信システム。 The detection area for determining that the portable device is outside or close to the outside of the vehicle is set so as not to include an area that is desired to be detected by reducing the threshold for area determination by the first antenna. The wireless communication system according to claim 1 .
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