JP2009127282A - Keyless entry system and mobile device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a keyless entry system and a mobile device preventing a user from feeling unpleasant due to a shortened working distance when interference radio waves exist, while reducing cost and in its turn allowing the user's continuous comfortable use. <P>SOLUTION: When either one of lock/unlock buttons for a vehicle door or the like is pressed, if its pressing is within a mode time that specifies a special mode (S120: Yes), channel change information for instructing a change of a receiving channel to an on-vehicle apparatus is added to control information and an authentication code (S130) and transmitted (S140), and a transmitting channel of an own device is changed according to a predetermined sequence system (S150). The on-vehicle apparatus receiving the channel change information transmits a control command for locking/unlocking the vehicle door, to an ECU, and changes the receiving channel according to the same sequence system as the mobile device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a keyless entry system and a portable device that lock / unlock a door by transmitting and receiving radio waves.

  Conventionally, it has a transmitter for transmitting an authentication code unique to a vehicle to a predetermined frequency (hereinafter referred to as a fixed frequency) radio wave and a receiver for receiving a fixed frequency radio wave. Based on the radio wave authentication code received through the receiver, when it is confirmed that the authentication code transmission source (that is, transmitter) is registered in advance, the vehicle control device performs various vehicle controls. A vehicle control system is known.

  As one of this type of vehicle control system, a user presses a button of a transmitter (hereinafter referred to as a portable device) carried by a user of the vehicle, thereby locking / unlocking a door provided in the vehicle. A keyless entry system to execute is known (for example, see Patent Document 1).

As an extension of such a keyless entry system, when a user with an electronic key enters the wireless communication area around the vehicle, the transmission source is confirmed by bidirectional communication between the electronic key and the vehicle control device. There is a smart entry system, but its configuration is relatively complicated, resulting in high costs, and there is a strong demand for a keyless entry system.
JP 2002-129794 A

  However, in the conventional keyless entry system, when there is a disturbance or other radio wave that interferes with the radio wave transmitted from the portable device (hereinafter referred to as a jamming radio wave), the door lock / unlock is activated by the jamming radio wave. The distance from the portable device required to the receiver (hereinafter referred to as the working distance) may become extremely short.

  In particular, if there is a jamming signal in a place where the vehicle is parked frequently, the user will continue to use the keyless entry system with a short working distance. There was a problem that it might be.

  In order to solve the above-described problems, an object of the present invention is to provide a keyless entry system and a portable device that can be used comfortably by a user while suppressing cost.

  The keyless entry system according to claim 1, wherein the portable device carried by a user of a vehicle (hereinafter referred to as a target vehicle) that is a target of the system has a preset external operation. When an on-board device mounted on the target vehicle receives the authentication code from the portable device, a door (hereinafter referred to as a vehicle door) provided on the target vehicle is locked. / Perform unlocking.

  However, in the keyless entry system of the present invention, wireless communication in one direction from the portable device side to the in-vehicle device side is any one of a plurality of communication channels having different frequencies prepared in advance between the portable device and the in-vehicle device. It is done using.

  Here, when the portable device detects an external operation after a preset special operation is performed, channel change information for instructing a change of the reception channel, which is a communication channel used for reception by the in-vehicle device, is added to the authentication code. The information transmission process to be transmitted is executed, and after this information transmission process, the mobile side change process for changing the transmission channel, which is the communication channel used for transmission, is executed in accordance with the mobile side rules defined in advance. That is, in the mobile side change process, the transmission channel is changed to the communication channel for performing communication with the vehicle-mounted device after the next time.

  On the other hand, when the channel change information is added to the authentication code received from the portable device, the in-vehicle device executes a vehicle-side change process for changing the reception channel according to a vehicle-side rule defined in advance. In other words, in the vehicle side change process, the channel is changed to the reception channel (that is, the same frequency as the transmission channel set in the mobile side change process) for communication with the portable device after the next time.

  That is, in the keyless entry system of the present invention, when the vehicle door is locked / unlocked by an external operation performed on the portable device after the special operation, both the portable device and the vehicle-mounted device automatically The processing for setting the same frequency is performed in order to perform communication after the next time.

  Therefore, according to the keyless entry system of the present invention, even if the working distance of the system (that is, the distance between the portable device and the vehicle-mounted device) is extremely shortened by the jamming radio wave, it is used after the next time. The communication channel (transmission channel and reception channel) to be transmitted can be easily changed, and as a result, the user can use this system with a pleasant feeling continuously.

  Further, according to the keyless entry system of the present invention, since a simple configuration remains without changing from a unidirectional to a bidirectional wireless communication from the portable device to the in-vehicle device, the device (the portable device and the in-vehicle device). The existing vehicle control system for locking / unlocking the vehicle door and the like can be used.

  Furthermore, as described in claim 2, the portable device may execute the information transmission process and the portable side change process each time an external operation is detected for a certain time after the special operation is performed. desirable.

  In the keyless entry system configured as described above, after a special operation, a transmission channel for transmitting channel change information is switched every time an external operation is performed on the portable device for a certain period of time.

  Therefore, according to this keyless entry system, even if the communication channel (that is, the transmission channel and the reception channel) between the portable device side and the vehicle-mounted device side does not match, the vehicle door is locked / unlocked. By repeating the external operation on the portable device until the operation is performed, the communication channel between the portable device side and the in-vehicle device side can be reliably matched.

  Further, as described in claim 3, it is desirable that both the transmission channel and the reception channel have the same type and the same number as the communication channel. In this case, the mobile-side rule is defined to change the transmission channel in a predetermined order method, and the vehicle-side rule may be specified to change the reception channel in the same order method as the mobile-side rule. .

  According to the keyless entry system configured as described above, the channel change information transmitted in the information transmission process only needs to be instructed to change the reception channel, thereby reducing the control burden on the portable device. it can.

  Alternatively, as described in claim 4, the portable device may execute the information transmission process by designating the same channel as the transmission channel to be changed in the portable side change process in the channel change information. In this case, it is only necessary that the vehicle-side rule is set to be set to the reception channel specified by the channel change information.

  According to the keyless entry system configured as described above, since the in-vehicle device only needs to be set to the reception channel designated by the portable device, the communication channel after the change is surely matched between the portable device side and the in-vehicle device side. And, in turn, the availability of the system can be improved.

  Next, in the portable device according to claim 5, when the transmission unit transmits a radio signal at the frequency of the transmission channel and the authentication code transmission unit detects a preset external operation, Then, an authentication code unique to the target vehicle is transmitted. In addition, when the portable side control means detects an external operation after a preset special operation is performed, channel change information for instructing the change of the reception channel is added to the authentication code transmitted by the authentication code transmission means. The information transmission process to be transmitted is executed, and after this information transmission process, the portable side change process for changing the transmission channel according to the portable side rules is executed.

In the portable device according to the sixth aspect, the portable side control means executes the information transmission process and the portable side change process each time an external operation is detected for a certain time after the special operation is performed.
In the portable device according to the seventh aspect, the portable side control means executes the portable side change process based on the portable side rule that the transmission channel is changed in a predetermined order method. However, it is assumed that both the transmission channel and the reception channel have the same type and the same number as the communication channel.

  In the portable device according to the eighth aspect, the portable side control means designates a reception channel of the same type as the transmission channel to be changed in the portable side change process, and executes the information transmission process.

That is, the portable device according to claims 5 to 8 can be suitably used for the keyless entry system according to claims 1 to 4, respectively.
By the way, as described in claim 9, if the trigger for changing the communication channel is a special operation that is rarely performed by the user that the battery used in the portable device is turned on again, a user malfunction is caused. Therefore, the probability that the communication channel is changed according to the user's intention can be increased.

Embodiments of the present invention will be described below with reference to the drawings.
<Overall configuration>
FIG. 1 is a block diagram showing the configuration of a keyless entry system to which the present invention is applied.

  As shown in FIG. 1, the keyless entry system 1 includes a portable device 2 that is carried by a user of a vehicle (hereinafter referred to as a “target vehicle”) that is a target of the present system, and an in-vehicle device 3 that is mounted on the target vehicle. When the portable device 2 transmits a radio signal for the system (hereinafter referred to as a keyless signal) and the in-vehicle device 3 receives the keyless signal, the door (hereinafter referred to as a vehicle door) provided in the target vehicle is locked. A keyless entry function for performing unlocking / unlocking is realized.

  In the keyless entry system 1, the portable device 2 and the vehicle-mounted device 3 are mounted on the vehicle 2 from the portable device 2 side using a communication channel of any one of the three different frequencies f1 to f3 prepared in advance. Wireless communication in one direction to the machine 3 side is performed. Hereinafter, a communication channel used for transmission of the portable device 2 is a transmission channel, and a communication channel used for reception of the in-vehicle device 3 is a reception channel.

  The keyless signal transmitted from the portable device 2 includes at least an authentication code unique to the target vehicle. In the keyless signal of the present embodiment, control information for designating the control content (for example, door lock) in the keyless entry system 1 is written together with the authentication code.

<Configuration of portable device>
The portable device 2 is provided in a target vehicle, a transmission antenna 21 for transmitting a keyless signal, a lock button 22a for locking the vehicle door, an unlock button 22b for unlocking the vehicle door, and the target vehicle. A trunk button 22c for unlocking the trunk, an oscillating unit 23 for generating and outputting a carrier wave having a frequency designated according to a frequency designation signal Sd described later, and a carrier wave from the oscillating unit 23 according to a modulation signal Sv described later. The modulation unit 24 generates and outputs a data signal by modulating the signal, the matching unit 25 for efficiently supplying the data signal input from the modulation unit 24 to the transmission antenna 21, and the inputs from the buttons 22a to 21c. The frequency designation signal S for designating the frequency to the oscillating unit 23 by executing various processes according to the frequency. Supply or, and a control unit 26 for such supply of the modulation signal Sv representing baseband information, such as authentication code to the modulator 24.

  Among these, the oscillation part 23 is comprised using the PLL frequency synthesizer. The PLL frequency synthesizer includes a reference frequency generator (for example, a crystal oscillator), a phase comparator, a loop filter, a voltage controlled oscillator (hereinafter referred to as VCO), and a programmable frequency divider.

  Then, the PLL frequency synthesizer compares the phase of the signal obtained by dividing the carrier wave from the VCO with the programmable frequency divider and the output signal from the reference frequency generator with the phase comparator, and outputs the output signal from the phase comparator. A well-known operation for generating an output signal having a frequency divided by the reference frequency by supplying the direct current voltage to the loop filter, converting it to a direct current voltage, supplying the direct current voltage to the VCO, and feedback controlling the oscillation frequency of the VCO. Is. That is, the frequency can be changed by digitally setting the frequency division number of the programmable frequency divider based on the frequency designation signal Sd supplied from the control unit 26.

  The control unit 26 is mainly configured by a known microcomputer including a CPU, ROM, RAM, I / O, and a bus line connecting these components. Among these, the ROM has an area in which frequency data (here, the frequency division number of the programmable frequency divider) corresponding to the communication channels having the frequencies f1 to f3 is stored, and the CPU stores a program stored in the ROM. Based on the above, the following portable side control process is executed.

  The control unit 26 is provided with a program timer for measuring time based on the clock of the CPU. When the battery used for the portable device 2 is reinserted, the CPU is set in advance. In parallel, time count processing is performed in which the mode time is counted down according to the elapsed time after the battery (main power supply) is turned on again based on the program timer.

<Mobile control process>
Here, the portable side control process executed by the control unit 26 of the portable device 2 will be described in detail with reference to the flowchart shown in FIG. This process is started when it is detected that any of the buttons 22a to 22c is pressed.

  First, when this process is started, in S110, based on the input signals from the buttons 22a to 22c, the control content (for example, door unlocking etc.) corresponding to the pressed buttons 22a to 22c is designated. Specify control information.

  In subsequent S120, based on the time count process executed in parallel with the present process, whether or not the mode time has timed out, that is, the elapsed time after the battery is recharged is within the preset mode time. If the determination is affirmative, if the determination is affirmative, the state is considered to be in the special mode accompanied by the change of the set channel, and the process proceeds to S130.

  In S130, information is generated by adding the channel change information for requesting the in-vehicle device 3 to change the reception channel to the authentication code together with the control information specified in S110. Note that the channel change information of the present embodiment does not designate the changed reception channel to the in-vehicle device 3, but merely changes the reception channel.

  In subsequent S140, the information generated in S130 is transmitted as keyless information. When transmitting the keyless information, the frequency designation signal Sd representing the frequency data corresponding to the currently set transmission channel (for example, the frequency f1) is supplied to the oscillation unit 23, and the keyless information is transmitted in the baseband. A modulation signal Sv is supplied to the modulation unit 24.

  In subsequent S150, a transmission channel for the next transmission is set in accordance with a predetermined ordering method, and this process is terminated. In this ordering method, if the transmission channel (CH before change) at the time of transmission in S140 is the frequency f1, the transmission channel (setting CH) for the next transmission is set to the frequency f2, and the CH before change is the frequency. It is determined that the set CH is set to the frequency f3 if it is f2, and the set CH is set to the frequency f1 if the pre-change CH is the frequency f3. Incidentally, the transmission channel set here is stored in a non-volatile memory (for example, EEPROM) that holds stored information even when the main power is not supplied.

  On the other hand, if a negative determination is made in the previous S120, that is, the process proceeds to S160 when the special mode is not in effect, information obtained by adding the control information specified in the previous S110 to the authentication code is transmitted as keyless information. finish.

  In this way, in the mobile side control process, if the pressing of the buttons 22a to 22c is within the mode time, the keyless information to which the channel change information is added is transmitted (that is, transmission in the special mode), and the mode time is within the mode time. Otherwise, transmission of keyless information without adding channel change information (that is, transmission for performing only normal lock / unlock) is performed. When keyless information with channel change information added is transmitted, the transmission channel is changed according to a predetermined ordering method.

<Configuration of in-vehicle device>
Returning to FIG. 1, the in-vehicle device 3 receives the frequency f <b> 1 from the reception antenna 31 for receiving the keyless signal, the matching unit 32 for efficiently supplying the reception signal of the reception antenna 31, and the input signal from the matching unit 32. The band-pass filter 33 that passes the signal of ~ f3 and removes unnecessary input signals, and the signal of the frequency corresponding to the reception channel designated according to the channel designation signal Sa described later is an intermediate frequency signal (hereinafter referred to as IF signal). A tuner unit 34 that converts and outputs the IF signal; a demodulator 35 that demodulates the IF signal from the tuner unit 34; a low-pass filter 36 that removes a signal having a predetermined cutoff frequency or higher from the input signal from the demodulator 35; A waveform shaping unit 37 that shapes an input signal from the low-pass filter 36 into a rectangular wave, and a signal shaped by the waveform shaping unit 37 is converted into a binary value. And the supply of the channel designation signal Sa for designating the reception channel to the tuner unit 34 and the matching unit 32 by executing various processes in accordance with the input signal from the comparator 38. And a control unit 39 for supplying a channel switching signal Sr for switching to the matching circuit 32a corresponding to the reception channel.

  Among them, the matching unit 32 receives the signal from the reception antenna 31 most efficiently based on the three matching circuits 32a corresponding to the communication channels having the frequencies f1 to f3 and the channel switching signal Sr supplied from the control unit 39. Is provided with a changeover switch (hereinafter referred to as a changeover switch) 32b for switching the matching circuit 32a.

  Although not shown in the figure, the tuner unit 34 mixes a high-frequency amplifier composed of a low-noise amplifier or the like, a PLL frequency synthesizer type local oscillator, an output signal from the high-frequency amplifier and a local oscillation signal from the local oscillator. A mixer for converting to a frequency signal; an intermediate frequency amplifier for amplifying the intermediate frequency signal; and a reception intensity detector for detecting a received signal level (received electric field strength) and outputting a voltage signal corresponding to the received signal level. Yes. That is, the tuner unit 34 can select the frequency f1 to f3 of the received signal by changing the frequency of the local oscillation signal from the local oscillator based on the channel designation signal Sa supplied from the control unit 39. It is the well-known thing comprised.

  The control unit 39 is configured around a known microcomputer including a CPU, ROM, RAM, I / O, a bus line connecting these components, and the like. Among these, the ROM has an area in which a plurality of frequency data (here, the frequency of the channel designation signal Sa) corresponding to the communication channels having the frequencies f1 to f3 are stored, and the CPU stores a program stored in the ROM. Based on the above, the following vehicle side control processing is executed.

<Vehicle side control processing>
Here, the vehicle side control process which the control part 39 of the vehicle equipment 3 performs is demonstrated in detail along the flowchart shown in FIG. This process is started when an input signal from the comparator 38 is detected.

  First, when this process is started, in S210, it is determined whether or not the authentication code matches that registered in advance based on the input signal from the comparator 38 (ie, keyless information) (ie, If the determination is affirmative, the process proceeds to S220. If the determination is negative, the process ends.

  In S220, based on the control information included in the keyless information for which the authentication code has been confirmed in S210, a control command for executing the control content (for example, unlocking the vehicle door, etc.) according to this control information is issued. And supplied to a vehicle control device (ECU) which is provided in the target vehicle and performs various vehicle controls (including vehicle door lock / unlock processing).

  In subsequent S230, based on the keyless information for which the authentication code has been confirmed in S210, it is determined whether or not channel change information has been added to the authentication code. If an affirmative determination is made, the process proceeds to S240, and a negative determination is made. This processing ends.

  In S240, a reception channel for next reception is set according to a predetermined ordering method, and this process is terminated. Note that this ordering method is the same as the previous mobile-side control process, and if the reception channel (pre-change CH) at the time of reception in the previous S210 is the frequency f1, the reception channel (setting CH for the next reception) ) Is set to the frequency f2, and if the pre-change CH is the frequency f2, the set CH is set to the frequency f3, and if the pre-change CH is the frequency f3, the set CH is set to the frequency f1. Incidentally, the reception channel set here is stored in a non-volatile memory (for example, EEPROM) that holds stored information even when the main power is not supplied.

  When the reception channel is changed, a channel designation signal Sa representing frequency data corresponding to the reception channel (setting CH) set in S240 is supplied to the demodulator 35, and a channel switching signal corresponding to this frequency data is supplied. Sr is supplied to the matching unit 32.

  Thus, in the vehicle-side control process, when channel change information is added to the received authentication code, the vehicle door is locked / unlocked and a predetermined order method (portable-side control) is executed. The reception channel is changed according to the ordering method in the processing).

<Effect of this embodiment>
As described above, in the keyless entry system 1 of the present embodiment, the portable device 2 transmits the channel change information by adding the channel change information to the authentication code when the button 22a to 22c is pressed after the battery is reinserted. When the transmission channel of the apparatus is changed and the in-vehicle device 3 receives this channel change information, the vehicle door is locked / unlocked and the reception channel of the own apparatus is changed.

  Therefore, according to the keyless entry system 1 of the present embodiment, both the transmission channel and the reception channel are set even in a situation where the communication distance between the portable device 2 and the vehicle-mounted device 3 becomes extremely short due to jamming radio waves. The system can be changed at the same time, and as a result, the user can use the system with a comfortable feeling.

  Furthermore, according to the keyless entry system 1 of the present embodiment, a simple configuration remains without changing from unidirectional to bidirectional wireless communication from the portable device 2 to the in-vehicle device 3. The existing vehicle control system for locking / unlocking the vehicle door and the like can be used while suppressing the manufacturing cost and the control burden on the vehicle 2 and the vehicle-mounted device 3.

  Further, in the keyless entry system 1, if the portable device 2 is within the mode time, the channel change information is transmitted each time the buttons 22a to 22c are pressed, and the transmission channel is set to a frequency according to a predetermined order method. In order to change to any one of f1-f3, channel change information can be transmitted on a different transmission channel for each transmission.

  On the other hand, in the keyless entry system 1, when the in-vehicle device 3 receives the channel change information, it locks / unlocks the vehicle door, and the reception channel is set to any of the frequencies f1 to f3 according to the same ordering method as the portable device 2. Change it.

  Therefore, according to the keyless entry system 1 of the present embodiment, the vehicle door is locked / unlocked even if the transmission channel of the device itself does not match the reception channel of the in-vehicle device 3. By repeatedly pressing the buttons 22a to 22c of the portable device 2 until the user can reliably match the two communication channels.

  Furthermore, when the portable device 2 transmits the channel change information (that is, when changing the communication channel), it is only necessary to write in the channel change information that the reception channel is changed. This is unnecessary, and as a result, the control burden and communication burden of the device itself can be reduced.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it is possible to implement in various aspects.

  For example, in the above-described embodiment, re-insertion of the battery used for the portable device 2 is a trigger for changing the transmission channel and the reception channel, but a special operation that is rarely performed by the user to prevent the user from malfunctioning. Any operation may be used. For example, all the buttons 22a to 22c may be simultaneously pressed a plurality of times. This special operation does not necessarily need to be configured so that the user can easily execute it, and may be configured so that the dealer can execute even a complicated operation.

  Also, if the buttons 22a to 22c are pressed within the mode time, the channel change information is transmitted. However, the channel change information does not depend on the mode time, for example, a predetermined number of times after the special operation. May be transmitted.

  Further, the portable device 2 transmits any one of the frequencies f1 to f3 for changing the reception channel specified in the channel change information, and the frequency specified for the transmission channel of the own device in the channel change information. You may make it change into the same thing. For convenience of explanation, three frequencies f1 to f3 of the communication channel (transmission channel and reception channel) are used. However, the number is not particularly limited to this number, and a plurality of frequencies may be used.

  In addition, the control part 39 of the vehicle equipment 3 may be previously incorporated in the vehicle control apparatus (ECU). In this case, the device configuration of the in-vehicle device 3 can be further simplified.

1 is a block diagram showing a configuration of a keyless entry system to which the present invention is applied. The flowchart which shows the detail of the portable side control process which the control part 26 of the portable device 2 performs. The flowchart which shows the detail of the vehicle side control process which the control part 39 of the vehicle equipment 3 performs

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Keyless entry system, 2 ... Portable machine, 3 ... Vehicle equipment, 21 ... Transmission antenna, 22a ... Lock button, 22b ... Unlock button, 22c ... Trunk button, 23 ... Oscillator, 24 ... Modulator, 25 ... matching unit, 26 ... control unit, 31 ... receiving antenna, 32 ... matching unit, 33 ... bandpass filter, 34 ... tuner unit, 35 ... demodulator unit, 32a ... matching circuit, 32b ... switch SW, 36 ... low pass filter 37 ... Waveform shaping unit, 38 ... Comparator, 39 ... Control unit.

Claims (9)

A frequency prepared in advance between a portable device that is carried by a vehicle user and detects a preset external operation and transmits an authentication code unique to the vehicle and an in-vehicle device mounted on the vehicle. By performing wireless communication in one direction from the portable device side to the in-vehicle device side using any of a plurality of different communication channels, when the in-vehicle device receives the authentication code, the vehicle door lock / A keyless entry system that unlocks
The portable device is
When the external operation is detected after a preset special operation is performed, channel change information for instructing a change of a reception channel, which is the communication channel used for reception by the in-vehicle device, is added to the authentication code and transmitted. The information transmission process is performed, and after the information transmission process, the mobile side change process for changing the transmission channel, which is the communication channel used for transmission, is executed in accordance with a mobile side rule defined in advance.
The in-vehicle device is
A keyless entry, wherein when the channel change information is added to the authentication code received from the portable device, a vehicle side change process for changing the reception channel according to a predetermined vehicle side rule is performed. system.   The said portable machine performs the said information transmission process and the said portable side change process, whenever it detects the said external operation for the fixed time after the said special operation was made | formed. Keyless entry system. Both the transmission channel and the reception channel have the same type and the same number as the communication channel,
The mobile-side rule is defined to change the transmission channel in a predetermined order method,
3. The keyless entry system according to claim 1, wherein the vehicle-side rule is defined so as to change the reception channel in the order method. 4. The portable device executes the information transmission process by designating the reception channel of the same type as the transmission channel to be changed in the portable side change process in the channel change information,
3. The keyless entry system according to claim 1, wherein the vehicle-side rule is defined to be set in the reception channel specified by the channel change information. Unidirectional wireless communication to the vehicle-mounted device side using any one of a plurality of communication channels prepared in advance and being carried by a vehicle user and mounted on the vehicle. A portable device for communication,
Transmitting means for transmitting a radio signal in a transmission channel which is the communication channel used for transmission;
An authentication code transmission means for transmitting an authentication code unique to the vehicle via the transmission means when detecting a preset external operation;
When the external operation is detected after a special operation set in advance, the authentication code transmitting means transmits the channel change information instructing to change the reception channel used for reception by the in-vehicle device. A mobile side control means for executing a mobile side change process for changing the transmission channel according to a mobile side rule defined in advance after the information transmission process.
A portable device comprising:   The said portable side control means performs the said information transmission process and the said portable side change process, whenever it detects the said external operation for the fixed time after the said special operation was made | formed. The portable machine as described in. Both the transmission channel and the reception channel have the same type and the same number as the communication channel,
The portable device according to claim 5 or 6, wherein the portable-side rule is defined to change the transmission channel in a predetermined order method.   The said portable side control means performs the said information transmission process by designating the said reception channel of the same kind as the said transmission channel changed by the said portable side change process to the said channel change information. The portable device according to claim 6.   The portable device according to claim 5, wherein the special operation is re-insertion of a battery used in the portable device.

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