JP2001094486A - Method for reducing power consumption of on-vehicle device - Google Patents
Method for reducing power consumption of on-vehicle deviceInfo
- Publication number
- JP2001094486A JP2001094486A JP26690499A JP26690499A JP2001094486A JP 2001094486 A JP2001094486 A JP 2001094486A JP 26690499 A JP26690499 A JP 26690499A JP 26690499 A JP26690499 A JP 26690499A JP 2001094486 A JP2001094486 A JP 2001094486A
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- Japan
- Prior art keywords
- vehicle
- unit
- vehicle device
- communication
- fcms
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000004891 communication Methods 0.000 claims abstract description 82
- 230000005540 biological transmission Effects 0.000 claims description 28
- 238000012545 processing Methods 0.000 abstract description 14
- 238000010586 diagram Methods 0.000 description 11
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000013256 coordination polymer Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Devices For Checking Fares Or Tickets At Control Points (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、車載器の制御方法
に係り、特に、電子式料金収受システムにおける通信エ
リアにおいてのみ車載器の動作を行わせるようにした車
載器の消費電力の低減方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an on-vehicle device, and more particularly, to a method for reducing power consumption of an on-vehicle device which operates only in a communication area of an electronic toll collection system. Things.
【0002】[0002]
【従来の技術】電子式料金収受システム(以下、ETC
という)は、ビーコンと呼ばれる通信装置と車載器の間
で無線通信を行って高速道路の料金収受を自動で行うシ
ステムである。ETCの車載器はダッシュボード上など
の直射日光が当たる場所におかれる可能性があるため、
温度の上昇が予想される。そのため、温度の上昇を抑え
るためにも、無線通信をしない時には車載器の消費電力
を抑えるためにRF部をOFFにするといった対策が必
要となる。2. Description of the Related Art Electronic toll collection system (hereinafter referred to as ETC)
Is a system that performs wireless communication between a communication device called a beacon and a vehicle-mounted device to automatically collect tolls on an expressway. Since the ETC's on-board equipment may be placed in direct sunlight, such as on the dashboard,
An increase in temperature is expected. Therefore, in order to suppress a rise in temperature, it is necessary to take measures such as turning off the RF unit to suppress power consumption of the vehicle-mounted device when wireless communication is not performed.
【0003】ところが、従来は、ETCの車載器のRF
部は、いつ通信エリアに入っても通信できるように常に
ON状態であった。[0003] However, conventionally, the RF of the onboard equipment of ETC has been used.
The unit was always in the ON state so that communication could be performed any time the user entered the communication area.
【0004】また、従来は、ETCの通信プロトコルは
決まっていなかったため、立ち上げタイミングを決める
ことができず、RF部の送信回路をOFFにすることが
できなかった。そのため送信回路は常にON状態であっ
た。Conventionally, since the communication protocol of ETC has not been determined, the start-up timing cannot be determined, and the transmission circuit of the RF unit cannot be turned off. Therefore, the transmission circuit was always on.
【0005】更に、従来はCPUの立ち上げは電源ON
のときしか行えなかった。Further, conventionally, when the CPU is started, the power is turned on.
Could only be done at
【0006】[0006]
【発明が解決しようとする課題】このように、ETCの
車載器は主にビーコンの通信エリアでのみ動作をすれば
よいものである。ところが、従来のように常時車載器の
RF部をON状態にする方法では、通信エリア以外の何
も処理を行わない状況においては、無駄に電力を消費し
てしまうといった問題があった。As described above, the vehicle-mounted device of the ETC only needs to operate mainly in the communication area of the beacon. However, the conventional method of constantly turning on the RF unit of the vehicle-mounted device has a problem that power is wasted in a situation where no processing is performed except for the communication area.
【0007】通常は、通信エリアに入って制御用スロッ
トを受信してから登録チャネルを送信するため、RF部
の送信回路は通信エリア外でOFFにしても問題はない
ため、ETCの車載器における送信回路の立ち上げ方法
を工夫して、消費電力を低減する必要がある。Normally, since the registration channel is transmitted after entering the communication area and receiving the control slot, there is no problem if the transmission circuit of the RF unit is turned off outside the communication area. It is necessary to reduce the power consumption by devising a method of starting the transmission circuit.
【0008】更に、ETCの車載器は主にビーコンの通
信エリアでのみ動作をすればよいものであるが、従来の
方法では、常に車載器のCPUは立ち上がっていて、何
も処理を行わない場合においては、無駄に消費電力が大
きくなるのを回避するためにCPUをスリープ状態にし
て必要なときだけ立ち上げる必要がある。しかし、従来
はETCの通信プロトコルは決まっていなかったため、
本来の通信機能に影響を与えないCPUの立ち上げタイ
ミングを決めることができないという問題点があった。[0008] Furthermore, the on-board unit of the ETC only needs to operate mainly in the communication area of the beacon, but in the conventional method, the CPU of the on-board unit is always up and no processing is performed. In order to avoid the wasteful increase in power consumption, it is necessary to put the CPU into a sleep state and start it only when necessary. However, since the communication protocol of ETC was not decided before,
There is a problem that it is not possible to determine the start-up timing of the CPU which does not affect the original communication function.
【0009】本発明は、上記問題点を除去し、車載器の
動作を通信エリアのみで行わせることにより、消費電力
を低減することができる車載器の消費電力の低減方法を
提供することを目的とする。An object of the present invention is to provide a method for reducing the power consumption of an on-vehicle device by eliminating the above-mentioned problem and reducing the power consumption by causing the operation of the on-vehicle device to be performed only in a communication area. And
【0010】[0010]
【課題を解決するための手段】本発明は、上記目的を達
成するために、 〔1〕車載器のRF部の制御方法において、路側通信装
置からのFCMS信号を車載器が正常に受信したか否か
に応じて、前記車載器のRF部のON/OFFを制御す
ることを特徴とする。According to the present invention, there is provided a method for controlling an RF unit of an on-vehicle device, the method comprising: determining whether an on-vehicle device normally receives an FCMS signal from a roadside communication device; It is characterized in that the ON / OFF of the RF unit of the vehicle-mounted device is controlled according to whether or not it is determined.
【0011】〔2〕車載器のRF部の送信回路の制御方
法において、路側通信装置からのFCMS信号を車載器
が正常に受信したか否かに応じて、前記車載器のRF部
の送信回路のON/OFFを制御することを特徴とす
る。[2] In the control method of the transmission circuit of the RF unit of the vehicle-mounted device, the transmission circuit of the RF unit of the vehicle-mounted device depends on whether the vehicle-mounted device normally receives the FCMS signal from the roadside communication device. Is controlled on / off.
【0012】〔3〕車載器のCPUの制御方法におい
て、路側通信装置からのプロトコルに同期してFCMS
信号を車載器が正常に受信したか否かに応じて、前記車
載器のスリープ状態にあるCPUの立ち上げを制御する
ことを特徴とする。[3] In the control method of the CPU of the vehicle-mounted device, the FCMS is synchronized with the protocol from the roadside communication device.
The activation of the CPU in the sleep state of the vehicle-mounted device is controlled according to whether the vehicle-mounted device has received the signal normally.
【0013】[0013]
【発明の実施の形態】以下、本発明の実施の形態につい
て図を参照しながら詳細に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【0014】図1は本発明の第1実施例のETCにおけ
る車載器のRF部のON/OFF制御方法の説明図、図
2はそのETCの通信プロトコルのフレーム構成図、図
3はその車載器の概略ブロック図である。FIG. 1 is an explanatory diagram of an on / off control method of an RF unit of an on-vehicle device in an ETC according to a first embodiment of the present invention, FIG. 2 is a frame configuration diagram of a communication protocol of the ETC, and FIG. It is a schematic block diagram of.
【0015】図1において、1は道路、2は車両、3は
車両に搭載される車載器、4は路側通信装置のアンテ
ナ、5は通信エリアであり、このETCでは、通信エリ
ア5内においてビーコンと呼ばれる路側通信装置のアン
テナ4と車両2に搭載される車載器3の間で無線通信を
行って高速道路の料金収受を自動的に行う。In FIG. 1, 1 is a road, 2 is a vehicle, 3 is a vehicle-mounted device mounted on the vehicle, 4 is an antenna of a roadside communication device, 5 is a communication area. Wireless communication is performed between an antenna 4 of a roadside communication device called a vehicle-side device and an on-vehicle device 3 mounted on the vehicle 2 to automatically collect tolls on a highway.
【0016】ETCの通信プロトコルの伝送フレーム
は、図2に示すように、ダウン・リンク(Down・L
ink)〔路側通信装置から車載器へ向けての通信〕に
おいては、フレームコントロールメッセージスロット
(FCMS)とその他のスロットから成り立つ。その他
のスロットにはメッセージのやりとりをするスロット
(MDS)がある。As shown in FIG. 2, the transmission frame of the ETC communication protocol is a downlink (Down L
Ink) [communication from the roadside communication device to the vehicle-mounted device] comprises a frame control message slot (FCMS) and other slots. Other slots include slots for exchanging messages (MDS).
【0017】また、アップ・リンク(Up・Link)
〔車載器から路側通信装置へ向けての通信〕において
は、MDSや登録を上げるスロット(ACTS)などが
ある。フレーム構造の判別はFCMSの制御情報で行
う。[0017] Uplink (Up Link)
[Communication from the vehicle-mounted device to the roadside communication device] includes MDS and a slot (ACTS) for increasing registration. The determination of the frame structure is performed based on the control information of FCMS.
【0018】ETCでは数フレーム繰り返すことによっ
て1トランザクションが終了する。1トランザクション
は通信エリア5内で完結しなければならない。In the ETC, one transaction is completed by repeating several frames. One transaction must be completed in the communication area 5.
【0019】RF部のON/OFFのコントロールは通
信エリア5外にて行い、ONの時間は最低1フレーム+
FCMS(1スロット)必要である。The ON / OFF control of the RF unit is performed outside the communication area 5, and the ON time is at least one frame +
FCMS (1 slot) is required.
【0020】図3に示すように、車載器3は、中央処理
装置(CPU)11、RF部12、送受信アンテナ1
3、電源14、電源制御部15、カードリーダライタ1
6、表示装置17、CPU立ち上げ制御回路18(後述
の第3実施例で詳述)などで構成されている。As shown in FIG. 3, the vehicle-mounted device 3 includes a central processing unit (CPU) 11, an RF unit 12, a transmitting / receiving antenna 1
3, power supply 14, power supply control unit 15, card reader / writer 1
6, a display device 17, a CPU start-up control circuit 18 (described in detail in a third embodiment described later), and the like.
【0021】そこで、車載器3が路側通信装置からのF
CMSの受信を正常に行い、通信エリア5内に入った場
合、車載器3のRF部12の電源制御部15の制御によ
り、電源14からの電力をON状態に固定する。そし
て、1トランザクションの処理が終了したら、電源制御
部15の制御により、電源14からの電力のON状態を
解除して、ON/OFFモードに切り換え、ON/OF
F動作を繰り返す。Therefore, the vehicle-mounted device 3 receives the F from the roadside communication device.
When the CMS is normally received and the vehicle enters the communication area 5, the power from the power supply 14 is fixed to the ON state under the control of the power supply control unit 15 of the RF unit 12 of the vehicle-mounted device 3. Then, when the processing of one transaction is completed, the ON state of the power from the power supply 14 is released under the control of the power supply control unit 15, the mode is switched to the ON / OFF mode, and ON / OF
The F operation is repeated.
【0022】なお、本発明の車載器のRF部のON/O
FF制御方法においては、1トランザクションの処理を
確実に終了するために、RF部のON状態の時間を
T1 、OFF状態の時間をT2 、車両が通信エリア内に
いる時間をT3 、1トランザクションの処理に必要な時
間をT4 とすると、T3 >T1 +T2 +T4という条件
を満たしていなければならない。The ON / O of the RF unit of the vehicle-mounted device of the present invention
In the FF control method, in order to reliably end the processing of one transaction, the ON time of the RF unit is T 1 , the OFF time is T 2 , and the time the vehicle is in the communication area is T 3 , 1. When the processing time required for the transaction to T 4, T 3> T 1 + T 2 + must satisfy the condition that T 4.
【0023】以下、本発明の車載器のRF部のON/O
FF制御方法について説明する。Hereinafter, ON / O of the RF unit of the vehicle-mounted device of the present invention will be described.
The FF control method will be described.
【0024】図4は本発明の第1実施例の車載器のRF
部の制御フローチャートである。FIG. 4 shows the RF of the vehicle-mounted device according to the first embodiment of the present invention.
It is a control flowchart of a part.
【0025】(1)まず、車載器のRF部のON状態
(T1 の時間)に路側通信装置からのFCMSを正常に
受信できるか否かを判別する(ステップS1)。[0025] (1) First, it is determined whether FCMS be normally received from the vehicle-mounted device roadside communication device (time T 1) ON state of the RF portion of (Step S1).
【0026】(2)車載器のRF部がT1 の時間内(O
N状態)にFCMSを正常受信できた場合は、RF部を
ON状態にロックして、1トランザクションの処理を実
行する(ステップS2)。[0026] (2) RF portion of the vehicle-mounted device is within a time T 1 (O
If the FCMS has been successfully received in the (N state), the RF unit is locked in the ON state, and the processing of one transaction is executed (step S2).
【0027】(3)1トランザクションの処理を終了
後、車載器がFCMSを正常に受信できなくなったか
(通信エリア外に出たか)否かを判断する(ステップS
3)。なお、車載器がFCMSを正常に受信できなくな
るまでRF部をON状態にロックする。(3) After the processing of one transaction is completed, it is determined whether or not the vehicle-mounted device cannot normally receive the FCMS (is out of the communication area) (step S).
3). Note that the RF unit is locked in the ON state until the vehicle-mounted device cannot normally receive the FCMS.
【0028】(4)車載器がFCMSを受信できなくな
った(通信エリア外に出た)ら、電源制御部のタイムア
ウト処理を行い(ステップS4)、電源制御部により、
ON状態のロックモードから、ON/OFFモードに切
り換え、電源のON/OFFを繰り返す動作に入り、ス
テップS1へ戻る。(4) When the vehicle-mounted device cannot receive the FCMS (goes out of the communication area), a timeout process of the power control unit is performed (step S4).
The operation is switched from the lock mode in the ON state to the ON / OFF mode, and an operation of repeating power ON / OFF is started, and the process returns to step S1.
【0029】(5)ステップS1において、逆にRF部
がT1 の時間内(ON状態)にFCMSを正常受信でき
なかった場合は、RF部をOFF状態にし(ステップS
5)、T2 時間後にRF部をON状態にする(ステップ
S6)。[0029] (5) In step S1, when the RF unit in the reverse could not normally receive the FCMS within the time T 1 (ON state), the RF unit to the OFF state (step S
5) After T 2 hours, the RF unit is turned on (step S6).
【0030】以上のように、第1実施例によれば、本来
の通信機能にほとんど影響を与えることなく、RF部の
制御を行うことができるので、消費電力を抑えることが
できる。As described above, according to the first embodiment, the RF unit can be controlled without substantially affecting the original communication function, so that power consumption can be suppressed.
【0031】なお、上記第1実施例では、ETCの車載
器に適用した例を説明したが、ETC以外で限られた通
信エリアで無線アクセス方式がTDMAで通信を行う機
器にも適用可能である。In the first embodiment, an example in which the present invention is applied to a vehicle-mounted ETC device has been described. However, the present invention can also be applied to a device other than the ETC, in which a wireless access method uses TDMA in a limited communication area. .
【0032】次に、本発明の第2実施例について説明す
る。Next, a second embodiment of the present invention will be described.
【0033】この実施例においては、電子式料金収受シ
ステムにおける車載器のRF部の送信回路のON/OF
F制御方法について説明する。In this embodiment, the ON / OF of the transmission circuit of the RF unit of the vehicle-mounted device in the electronic toll collection system is described.
The F control method will be described.
【0034】図5は本発明の第2実施例のETCにおけ
る車載器のRF部の送信回路の制御方法の説明図、図6
はその車載器のRF部のブロック図である。なお、ET
Cの通信プロトコルの伝送フレームは、前記した図2と
同様であるので、その説明は、ここでは省略する。FIG. 5 is an explanatory diagram of a control method of the transmission circuit of the RF unit of the vehicle-mounted device in the ETC according to the second embodiment of the present invention.
FIG. 2 is a block diagram of an RF unit of the vehicle-mounted device. ET
Since the transmission frame of the communication protocol of C is the same as that in FIG. 2 described above, the description is omitted here.
【0035】ここで、図5において、21は道路、22
は車両、23は車両に搭載される車載器、24は路側通
信装置のアンテナ、25は通信エリアである。Here, in FIG. 5, reference numeral 21 denotes a road;
Is a vehicle, 23 is a vehicle-mounted device mounted on the vehicle, 24 is an antenna of a roadside communication device, and 25 is a communication area.
【0036】また、図6において、車載器23は、制御
回路31、RF部32を有しており、そのRF部32
は、送信回路33、受信回路34からなり、回路構成は
RF部32が送信回路33と受信回路34に分かれてい
る必要がある。In FIG. 6, the vehicle-mounted device 23 has a control circuit 31 and an RF unit 32, and the RF unit 32
Comprises a transmitting circuit 33 and a receiving circuit 34, and the circuit configuration requires that the RF unit 32 be divided into a transmitting circuit 33 and a receiving circuit 34.
【0037】受信回路34からは制御回路31へ受信デ
ータS1 (図5参照)が送られ、制御回路31は送信回
路33へON/OFF制御信号S2 (図5参照)を送
り、制御回路31は、送信回路33からON/OFFの
状態信号S3 (図5参照)を受け取る。The reception data S 1 (see FIG. 5) is sent from the reception circuit 34 to the control circuit 31, and the control circuit 31 sends an ON / OFF control signal S 2 (see FIG. 5) to the transmission circuit 33, 31 receives the ON / OFF state signal S 3 (see FIG. 5) from the transmission circuit 33.
【0038】ここで、送信回路33の立ち上がりに必要
な時間をT11、1トランザクションに必要な時間を
T12、車両が通信エリア内にいる時間をT13とすると、 T13>T11+T12 を満たしていることが必要である。Here, assuming that the time required for the rise of the transmission circuit 33 is T 11 , the time required for one transaction is T 12 , and the time the vehicle is in the communication area is T 13 , T 13 > T 11 + T 12 Must be satisfied.
【0039】以下、この実施例の車載器23のRF部3
2の送信回路のON/OFF制御方法について説明す
る。Hereinafter, the RF unit 3 of the vehicle-mounted device 23 of this embodiment will be described.
The ON / OFF control method of the transmission circuit 2 will be described.
【0040】図7は本発明の第2実施例の車載器のRF
部の送信回路のON/OFF制御フローチャートであ
る。FIG. 7 shows the RF of the vehicle-mounted device according to the second embodiment of the present invention.
6 is a flowchart of ON / OFF control of a transmission circuit of a unit.
【0041】ここに、図5、図6とともに、その動作を
説明する。The operation will now be described with reference to FIGS.
【0042】(1)まず、路側通信装置からのFCMS
を正常に受信しないか否かを判断する(ステップS1
1)。(1) First, FCMS from the roadside communication device
Is not normally received (step S1).
1).
【0043】(2)次に、路側通信装置からのFCMS
を正常に受信しない場合には、制御回路31からのON
/OFF制御信号S2 をOFFとなし(ステップS1
2)、ステップS11へ戻る。(2) Next, FCMS from the roadside communication device
Is not normally received, the ON
/ OFF control signal S 2 to OFF ungated (step S1
2) Return to step S11.
【0044】(3)路側通信装置からのFCMSを正常
に受信した場合には、制御回路31からのON/OFF
制御信号S2 をONとする。つまり、送信回路33の立
ち上げ開始のためのON/OFF制御信号S2 をONに
する(ステップS13)。(3) When the FCMS from the roadside communication device is normally received, ON / OFF from the control circuit 31 is performed.
The control signal S 2 is turned ON. That is, to ON ON / OFF control signal S 2 for the start-up start of the transmission circuit 33 (step S13).
【0045】(4)次に、送信回路33の立ち上げ完了
ON/OFF状態信号S3 をONになったか否かを判断
する(ステップS14)。[0045] (4) Next, it decides whether the turned ON to start-up completion ON / OFF state signal S 3 of the transmitting circuit 33 (step S14).
【0046】(5)次に、ステップS14においてON
になっていれば、トランザクション処理を行う(ステッ
プS15)。(5) Next, ON in step S14
If so, transaction processing is performed (step S15).
【0047】(6)次に、制御回路31からのON/O
FF制御信号S2 をOFFにする。(6) Next, ON / O from the control circuit 31
To OFF FF control signal S 2.
【0048】このように、通信エリア25外でのFCM
Sの受信はNGであるので、送信回路33はOFF状態
にある。その後、通信エリア25に入ってFCMSの受
信がOKとなると制御回路31はON/OFF制御信号
S2 をONにする。ON/OFF状態信号S3 がONに
なったら、制御回路31はトランザクション処理に移
る。トランザクション処理が終了したら、制御回路31
はON/OFF制御信号をOFFにする。As described above, the FCM outside the communication area 25
Since the reception of S is NG, the transmission circuit 33 is in the OFF state. Then, enter the communication area 25 receive the FCMS is the control circuit 31 becomes OK is ON the ON / OFF control signal S 2. When the ON / OFF state signal S 3 turned ON, the control circuit 31 proceeds to the transaction processing. When the transaction processing is completed, the control circuit 31
Turns off the ON / OFF control signal.
【0049】このように、第2実施例によれば、本来の
通信機能にほとんど影響を与えることなく、RF部の送
信回路のON/OFFを制御できる。そのため、通信エ
リア外の時は、車載器のRF回路の送信回路をOFFす
ることができ、消費電力を抑えることができる。As described above, according to the second embodiment, the ON / OFF of the transmission circuit of the RF unit can be controlled without substantially affecting the original communication function. Therefore, when it is out of the communication area, the transmission circuit of the RF circuit of the vehicle-mounted device can be turned off, and power consumption can be suppressed.
【0050】なお、第2実施例では、ETCの車載器に
適用した例を説明したが、ETC以外で限られた通信エ
リアで無線アクセス方式をTDMAで通信を行う車載器
にも適用可能である。In the second embodiment, an example in which the present invention is applied to an on-board device of ETC has been described. However, the present invention can also be applied to an on-vehicle device of performing a wireless access method using TDMA in a limited communication area other than ETC. .
【0051】次に、本発明の第3実施例について説明す
る。Next, a third embodiment of the present invention will be described.
【0052】この実施例においては、電子式料金収受シ
ステムにおける車載器のCPU立ち上げ方法について説
明する。In this embodiment, a method of starting the CPU of the vehicle-mounted device in the electronic toll collection system will be described.
【0053】この実施例のシステム構成図としては、前
記した図3を用いる。すなわち、RF部12の受信回路
(図示なし)で、路側通信装置からのFCMSを正常に
受信すると、CPU立ち上げ制御回路18を動作させ
て、スリープ状態にあるCPU11を立ち上げて、車載
器3の制御を可能にする。なお、ETCの通信プロトコ
ルの伝送フレームは、前記した図2と同様であるので、
ここではその説明は省略する。FIG. 3 is used as a system configuration diagram of this embodiment. That is, when the reception circuit (not shown) of the RF unit 12 normally receives the FCMS from the roadside communication device, the CPU activation control circuit 18 is operated, and the CPU 11 in the sleep state is activated, and the vehicle-mounted device 3 is activated. Control. Since the transmission frame of the ETC communication protocol is the same as that in FIG. 2 described above,
Here, the description is omitted.
【0054】この実施例では、CPU11の立ち上がり
に必要な時間をT21、1トランザクションに必要な時間
をT22、車両が通信エリア内にいる時間をT23、1フレ
ームの時間をT24とすると、周波数を1つしか使ってい
ない場合、 T23>T21+T22 複数(N個)の周波数を用いてチューニング処理を必要
とする場合、 T23>T22+T22+(N−1)・T24 を満たしていることが必要である。In this embodiment, assuming that the time required for the CPU 11 to start up is T 21 , the time required for one transaction is T 22 , the time that the vehicle is in the communication area is T 23 , and the time of one frame is T 24. If only one frequency is used, T 23 > T 21 + T 22 If tuning processing is required using a plurality of (N) frequencies, T 23 > T 22 + T 22 + (N−1) · it is necessary to meet the T 24.
【0055】以下、第3実施例の車載器のCPU立ち上
げ方法について説明する。Hereinafter, a method of starting the CPU of the vehicle-mounted device according to the third embodiment will be described.
【0056】図8は本発明の第3実施例の車載器のCP
U立ち上げ制御フローチャートである。FIG. 8 shows the CP of the vehicle-mounted device according to the third embodiment of the present invention.
It is a U starting control flowchart.
【0057】ここでは、周波数を2種類使っていて周波
数のチューニングが必要である例について説明する。Here, an example in which two kinds of frequencies are used and frequency tuning is required will be described.
【0058】(1)まず、路側通信装置からのFCMS
を正常に受信しないか否かを判断する(ステップS2
1)。(1) First, FCMS from the roadside communication device
Is not normally received (step S2).
1).
【0059】(2)次に、路側通信装置からのFCMS
を正常に受信しない場合には、周波数を切り換え(ステ
ップS22)、ステップS21へ戻る。(2) Next, FCMS from the roadside communication device
Is not normally received, the frequency is switched (step S22), and the process returns to step S21.
【0060】(3)FCMSを正常に受信した場合に
は、CPU11の立ち上げ処理を開始する(ステップS
23)。(3) If the FCMS is normally received, the startup process of the CPU 11 is started (step S).
23).
【0061】(4)次に、CPU11の立ち上げ処理を
完了したか否かを判断する(ステップS24)。(4) Next, it is determined whether the startup process of the CPU 11 has been completed (step S24).
【0062】(5)CPU11の立ち上げ処理か完了し
たら、トランザクション処理を行う(ステップS2
5)。(5) When the startup process of the CPU 11 is completed, a transaction process is performed (step S2).
5).
【0063】このように、通信エリア外でのFCMSの
受信はNGであるので周波数の切り換えをフレームごと
に行う。その後、通信エリアに入った場合はFCMSの
受信がOKとなり、CPU11は立ち上げ動作を行う。
周波数の切り換えはFCMSの受信がOKの時は行わな
い。CPU11の立ち上げ動作中は通信エリア内である
のでFCMSの受信はOKであり周波数はロックされ
る。CPU11の立ち上げ動作が終了したらトランザク
ション処理に移る。As described above, since the reception of the FCMS outside the communication area is NG, the frequency is switched for each frame. Thereafter, when the user enters the communication area, the reception of the FCMS is OK, and the CPU 11 performs a start-up operation.
Frequency switching is not performed when reception of FCMS is OK. Since the CPU 11 is in the communication area during the start-up operation, the reception of the FCMS is OK and the frequency is locked. When the startup operation of the CPU 11 is completed, the process proceeds to a transaction process.
【0064】このように、第3実施例によれば、通信プ
ロトコルに同期しているため、本来の通信機能にほとん
ど影響を与えることなく、スリープ状態にあるCPUを
立ち上げることができ、レーンごとに異なる周波数の場
合においても対応することができる。As described above, according to the third embodiment, since the communication is synchronized with the communication protocol, the CPU in the sleep state can be started up without substantially affecting the original communication function. Can be handled even when the frequency is different.
【0065】なお、第3実施例では、ETCの車載器に
適用した例を説明したが、ETC以外で限られた通信エ
リアで無線アクセス方式をTDMAで通信を行う車載器
にも適用可能である。In the third embodiment, an example in which the present invention is applied to an on-board device of ETC has been described. However, the present invention can also be applied to an on-vehicle device of performing a wireless access method using TDMA in a limited communication area other than ETC. .
【0066】また、通信制御方式としては、全二重通信
方式、半二重通信方式の両通信方式に適用可能である。
ここで、全二重通信方式とは送信と受信を同時にできる
方式のことであり、半二重通信方式とは送信と受信を同
時に行うことはできず、どちらか一方を切り換えて使う
方式のことである。The communication control system is applicable to both full-duplex communication system and half-duplex communication system.
Here, the full-duplex communication method is a method that can transmit and receive at the same time, and the half-duplex communication method is a method that cannot perform transmission and reception at the same time and uses one of them by switching either one. It is.
【0067】なお、本発明は上記実施例に限定されるも
のではなく、本発明の趣旨に基づいて種々の変形が可能
であり、これらを本発明の範囲から排除するものではな
い。It should be noted that the present invention is not limited to the above-described embodiment, and various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.
【0068】[0068]
【発明の効果】以上、詳細に説明したように、本発明に
よれば、以下のような効果を奏することができる。As described above, according to the present invention, the following effects can be obtained.
【0069】(1)本来の通信機能にほとんど影響を与
えることなく、RF部の制御を行うことができるので消
費電力を抑えることができる。(1) Since the RF unit can be controlled without substantially affecting the original communication function, power consumption can be suppressed.
【0070】(2)本来の通信機能にほとんど影響を与
えることなく、RF部の送信回路のON/OFFを制御
できる。そのため、通信エリア外の時は、車載器のRF
回路の送信回路をOFFすることができ、消費電力を抑
えることができる。(2) The ON / OFF of the transmission circuit of the RF unit can be controlled without substantially affecting the original communication function. Therefore, when outside the communication area,
The transmission circuit of the circuit can be turned off, and power consumption can be suppressed.
【0071】(3)通信プロトコルに同期しているた
め、本来の通信機能にほとんど影響を与えることなく、
スリープ状態にあるCPUを立ち上げることができ、レ
ーンごとに異なる周波数の場合においても対応できる。(3) Since the communication is synchronized with the communication protocol, it hardly affects the original communication function.
The CPU in the sleep state can be started up, and can cope with the case where the frequency is different for each lane.
【図1】本発明の第1実施例のETCにおける車載器の
RF部のON/OFF制御方法の説明図である。FIG. 1 is an explanatory diagram of an ON / OFF control method of an RF unit of a vehicle-mounted device in an ETC according to a first embodiment of the present invention.
【図2】本発明に係るETCの通信プロトコルのフレー
ム構成図である。FIG. 2 is a frame configuration diagram of an ETC communication protocol according to the present invention.
【図3】本発明に係るETCの車載器の概略ブロック図
である。FIG. 3 is a schematic block diagram of a vehicle-mounted device of the ETC according to the present invention.
【図4】本発明の第1実施例の車載器のRF部の電源の
制御フローチャートである。FIG. 4 is a control flowchart of a power supply of an RF unit of the vehicle-mounted device according to the first embodiment of the present invention.
【図5】本発明の第2実施例のETCにおける車載器の
RF部の送信回路の制御方法の説明図である。FIG. 5 is an explanatory diagram of a control method of a transmission circuit of an RF unit of the vehicle-mounted device in the ETC according to the second embodiment of the present invention.
【図6】本発明の第2実施例のETCにおける車載器の
RF部のブロック図である。FIG. 6 is a block diagram of an RF unit of the vehicle-mounted device in the ETC according to the second embodiment of the present invention.
【図7】本発明の第2実施例の車載器のRF部の送信回
路のON/OFF制御フローチャートである。FIG. 7 is a flowchart of the ON / OFF control of the transmission circuit of the RF unit of the vehicle-mounted device according to the second embodiment of the present invention.
【図8】本発明の第3実施例の車載器のCPU立ち上げ
制御フローチャートである。FIG. 8 is a flowchart of a CPU startup control of the vehicle-mounted device according to the third embodiment of the present invention.
1,21 道路 2,22 車両 3,23 車載器 4,24 路側通信装置のアンテナ 5,25 通信エリア 11 中央処理装置(CPU) 12,32 RF部 13 送受信アンテナ 14 電源 15 電源制御部 16 カードリーダライタ 17 表示装置 18 CPU立ち上げ制御回路 31 制御回路 33 送信回路 34 受信回路 1, 21 Road 2, 22 Vehicle 3, 23 On-board unit 4, 24 Antenna of roadside communication device 5, 25 Communication area 11 Central processing unit (CPU) 12, 32 RF unit 13 Transmission / reception antenna 14 Power supply 15 Power supply control unit 16 Card reader Writer 17 Display device 18 CPU startup control circuit 31 Control circuit 33 Transmission circuit 34 Receiving circuit
Claims (3)
側通信装置からのFCMS信号を車載器が正常に受信し
たか否かに応じて、前記車載器のRF部のON/OFF
を制御することを特徴とする車載器の消費電力の低減方
法。1. A method for controlling an RF unit of an on-vehicle device, comprising the steps of: turning on / off the RF unit of the on-vehicle device according to whether or not the on-vehicle device has normally received an FCMS signal from a roadside communication device.
A method for reducing power consumption of an on-vehicle device, comprising:
おいて、路側通信装置からのFCMS信号を車載器が正
常に受信したか否かに応じて、前記車載器のRF部の送
信回路のON/OFFを制御することを特徴とする車載
器の消費電力の低減方法。2. The method of controlling a transmission circuit of an RF unit of an on-vehicle device according to claim 1, wherein the on-vehicle device receives the FCMS signal from the roadside communication device in a normal manner. A method for reducing power consumption of a vehicle-mounted device, characterized by controlling ON / OFF.
側通信装置からのプロトコルに同期してFCMS信号を
車載器が正常に受信したか否かに応じて、前記車載器の
スリープ状態にあるCPUの立ち上げを制御することを
特徴とする車載器の消費電力の低減方法。3. A method for controlling a CPU of an on-vehicle device in a sleep state of the on-vehicle device according to whether or not the on-vehicle device normally receives an FCMS signal in synchronization with a protocol from a roadside communication device. A method for reducing power consumption of an on-vehicle device, characterized by controlling startup of a vehicle.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP26690499A JP2001094486A (en) | 1999-09-21 | 1999-09-21 | Method for reducing power consumption of on-vehicle device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26690499A JP2001094486A (en) | 1999-09-21 | 1999-09-21 | Method for reducing power consumption of on-vehicle device |
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Publication Number | Publication Date |
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JP2001094486A true JP2001094486A (en) | 2001-04-06 |
Family
ID=17437286
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JP26690499A Pending JP2001094486A (en) | 1999-09-21 | 1999-09-21 | Method for reducing power consumption of on-vehicle device |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002337613A (en) * | 2001-05-17 | 2002-11-27 | Murakami Corp | Battery driven mirror device |
JP2003309495A (en) * | 2002-04-16 | 2003-10-31 | Seiko Instruments Inc | Device for electronically transmitting data |
JP2005512422A (en) * | 2001-11-29 | 2005-04-28 | モトローラ・インコーポレイテッド | Method and apparatus for controlling service acquisition at a local area network device |
CN112203256A (en) * | 2020-09-11 | 2021-01-08 | 北京万集科技股份有限公司 | Control method and device for on-board unit, storage medium, and electronic device |
-
1999
- 1999-09-21 JP JP26690499A patent/JP2001094486A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002337613A (en) * | 2001-05-17 | 2002-11-27 | Murakami Corp | Battery driven mirror device |
JP2005512422A (en) * | 2001-11-29 | 2005-04-28 | モトローラ・インコーポレイテッド | Method and apparatus for controlling service acquisition at a local area network device |
JP2003309495A (en) * | 2002-04-16 | 2003-10-31 | Seiko Instruments Inc | Device for electronically transmitting data |
US7248894B2 (en) | 2002-04-16 | 2007-07-24 | Seiko Instruments Inc. | Data transfer system |
CN112203256A (en) * | 2020-09-11 | 2021-01-08 | 北京万集科技股份有限公司 | Control method and device for on-board unit, storage medium, and electronic device |
CN112203256B (en) * | 2020-09-11 | 2024-03-22 | 北京万集科技股份有限公司 | Control method and device of vehicle-mounted unit, storage medium and electronic device |
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