JP2007262882A - Apparatus control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus control system strong against security, and correctly recognizing control data from a normal portable unit. <P>SOLUTION: The portable unit 10 transmits the control data generated on the basis of an ID code for specifying oneself and a timer code updated every time of the transmission. A master machine 20 outputs an operation command signal to a security device from a security control part 27 when determining that the ID code and the timer code included in the received control data are correct by an ID code comparing part 23 and a timer code comparing part 24. When the timer code is not correct, its timer code is stored in a comparing timer code storage part 26, and is compared with a this time-received timer code stored in its comparing timer code storage part in the next reception, to determine whether or not to be in the correct relationship. Thus, even if the portable unit side timer code largely advances, its code is determined as correct by reception of second time. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a device control system for vehicle devices such as a vehicle door lock, an immobilizer, a luggage case of a two-wheeled vehicle, a key cover, a security, and other various devices that are operated and controlled by remote control operations.

  As one aspect of a device control system using radio waves, there is a vehicle door lock control system for unlocking / locking a vehicle door lock. The vehicle door lock control system can be roughly classified into a manual type in which a user having a portable device (transmitter) needs to press an operation button switch provided on the portable device, and a portable device. There is an automatic type that is unlocked and locked automatically just by carrying it around. For example, a manual vehicle door lock control system transmits a predetermined code by depressing an operation button switch of a portable device. Then, since the base unit (receiver) mounted on the vehicle receives the code, predetermined processing (unlocking / locking the door lock, etc.) is executed in accordance with the reception.

  By the way, normally, an ID code for identifying and recognizing the portable device is added to the code so that the code (control data) issued from the portable device is received by another unrelated parent device and does not malfunction. I am doing so. By adding the ID code in this way, it is possible to suppress receiving a code from a different portable device and thereby causing a malfunction.

  However, if the ID code is stolen, illegally copying and creating the portable device and using the ID code may impersonate a legitimate user and control the parent device. That is, for example, the door lock may be unlocked and stolen. Therefore, a timing code whose data is different (updated) for each transmission is added to the code information, and when the master unit receives control data in which both the ID code and the timing code meet the conditions, It is determined that the command is from the command, and processing according to the command is executed.

  Here, there are the following methods for generating a conventional time code. For example, there is a code that increments or decrements a numerical value by N each time it is updated, and returns to an initial value when it reaches a predetermined value. For example, when N is increased by 1 and the initial value is set to 0 and the end value is set to 100, the value changes from 0 to 1 to 2 to.

  There is also a method in which a numerical table with random numerical values is prepared and the next data on the numerical table is used as a time code each time it is updated. For example, in the example of FIG. 1, an 8-bit numeric table is provided, and the bit position of the numeric table is increased every time updating is performed, and 3 → 8 → 2 → 6 → 9 → 5 → 1 → 7 is read. When the last bit (8 bits) of the numerical table is reached, it may be repeated after returning to the first bit of the numerical table, or it returns to the previous bit such as 7 → 1 → 5 → 9 → 6 → 2 → 8 → 3. You may set as follows.

  On the other hand, at the base unit side, the code sent from the portable device is received by the receiving unit, the received data is analyzed, the ID code and the time code are extracted, and whether the ID code and the time code are correct is determined. I do. That is, the previously received timing code is stored in the comparison timing code storage unit, and whether or not the stored previous timing code and the currently received timing code are in the relationship defined in the above-described timing code generation requirement. If there is a certain relationship, it is determined that the signal is from a legitimate portable device.

  Specifically, for example, in the case of the method in which the former time code generator is added or subtracted by N, if a time code increased or subtracted by N from the previously received numerical value is received, it is determined as a time code from a legitimate portable device. it can. In the case of the latter random code, the base unit also has the same numerical value table as the portable device, and when the numerical value received last time and the numerical value received this time are in the variable table, the regular portable device It can be determined that it is a time code from

  By the way, if the operation button switch is pressed on the portable device side at a position where the parent device cannot receive ("Karauchi"), the timekeeping code on the portable device advances by one, but the parent device does not receive a signal from the portable device Therefore, the comparative timing code remains the same. That is, the synchronization of the time code (comparison time code) between the portable device and the parent device is out of order. As a result, even if a signal from a legitimate portable device is received thereafter, the time code does not match, and the operation becomes impossible. Therefore, as a countermeasure for this, when the timing code received by the master unit is different from the timing code received at the previous time to a predetermined range, it is determined that the predetermined timing code has been received.

  In this case, it is possible to deal with “from home”, but when the allowable range is narrow, it is not possible to cope with “from home” more than a predetermined number of times, and when the allowable range is wide, there is a probability that the copied code matches. Has the problem of becoming high. Furthermore, if “Karauchi” is repeatedly performed a plurality of times, the time code between the portable device and the parent device increases greatly, which may also exceed the allowable range.

  In addition to unlocking / locking the door lock, there are immobilizers, which are one of anti-theft systems, as vehicle equipment that operates by remote control operation from a portable device. This immobilizer also needs to be securely set (locked with a door lock) when getting off, and when the authorized user gets on, it must be released so that the engine can be started. Cause problems.

  Further, as one of anti-theft systems for motorcycles, there is a security mechanism such as a lock by a wheel key or a handle lock. In addition, for the purpose of preventing theft and mischief, there is a type in which an engine key portion that is normally exposed is closed with a key cover that can be opened and closed when getting off the vehicle. In some such systems, a portable device is manually operated in order to operate a device (actuator) for opening and closing the lock and key cover.

  Furthermore, the device for the vehicle is not limited to the actuator incorporated in the vehicle described above, and there are devices that are installed independently of the vehicle. In other words, for example, when it is determined that there is an abnormality by monitoring the state of the vehicle such as approaching the vehicle, intruding into the vehicle interior, or whether there is unreliable vibration in the vehicle for theft prevention (security) Some systems issue an alarm or contact the user, and the same problem occurs when the monitoring start / release setting of such a system is set by a signal from a portable device.

  The present invention has been made in view of the above-described background, and the object of the present invention is to solve the above-described problem, and for other reasons, the time code of a regular portable device exceeds the allowable range. High security device control system that can determine that it is correct even if it has advanced, and that does not operate based on control data from a portable device that has been forged based on illegally copied data Is to provide.

  A device control system for achieving the above object includes a portable device that transmits control data, and a master device that outputs an operation command signal to the device based on the control data transmitted from the portable device, The portable device includes an ID code storage unit that stores an ID code that identifies the portable device, a time code generation unit that generates a time code that is updated each time it is transmitted, and the ID code stored in the ID code storage unit. A data generation unit that generates the control data based on the timing code generated by the timing code generation unit, wherein the master unit receives the control data, and the control received by the reception unit ID code determination means (corresponding to “ID code comparison unit” in the embodiment) for determining whether or not the ID code included in the data is a regular ID code; Comparison timing code storage means for storing a timing code included in the control data including the regular ID code received last time as a comparison timing code, a timing code included in the control data received this time, and the comparison A time code determination means (corresponding to a “time code comparison section” in the embodiment) that compares the comparison time code stored in the time code storage means and determines whether or not it is a correct time code; and the ID When both the code determination unit and the determination result of the time code determination unit are correct, the control unit (corresponding to the “security control unit” in the embodiment) is configured to control the device. Note that the control data transmitted from the portable device may be either automatically operated at regular intervals or transmitted based on a user's manual operation.

  Here, the control data is not limited to data including specific control contents, but also includes information (data) that specifies specific control contents as described in the embodiments. Corresponds to the control data. In short, any device may be used as long as desired control is performed on the basis of the reception of regular control data on the base unit that has received the control data.

  According to the present invention, the control data is updated each time the portable device is transmitted by adding the time code. Therefore, even if the control data is copied, the copied control data is used to Even if a control command is sent to the machine, there is a high probability that the timing code is judged to be incorrect. In addition, if control data is repeatedly transmitted from a legitimate portable device in a state where the parent device cannot be received, information related to the previous timing data stored on the parent device side (comparison timing data) is actually received. Since the relationship of the measured time data is not correct, the master unit does not perform the predetermined control even if the control data is from a regular portable device. However, at this time, the received timing data determined to be incorrect is stored in the comparison timing code storage unit, so that the next time control data is received from a legitimate portable device, the timing data becomes the correct relationship. A desired control operation can be performed.

  Preferably, a plurality of comparison timing code storage means are provided, and one comparison timing code storage means includes a timing code included in control data including a regular ID code, and the timing code determination means Is stored in the control data including the regular ID code, and is not correct in the time code determination means. As a result of the determination in the timing code determination means, the timing code included in the control data received this time is stored in the separate comparison timing code storage means. Even when there is a correct relationship, it is determined that the correct timing code has been received.

  In this way, if the received timekeeping data determined to be incorrect is false data or incorrect timekeeping data such as garbled due to noise etc., the correct timekeeping data received before that Therefore, it is determined that the correct time data has been received based on the correct comparative time data when the next normal time data is received without being affected by the erroneous data.

  Further, as a result of the determination in the time code determination means, when the time code included in the control data received this time is in a correct relationship with the comparison time code stored in the other comparison time code storage means, The comparison timing code stored in the other comparison timing code storage means may be a correct comparison timing code.

  In addition, in the case where the comparison timing code stored in the other comparison timing code storage means is not correct, a function for erasing the comparison timing code stored in the other comparison timing code storage means is provided. Good. By deleting the incorrect comparison timing code, it is possible to eliminate processing delays caused by unnecessary comparison processing. The determination that the comparison timing code is incorrect is, for example, directly so that the comparison timing code and the timing code included in the control data having the next regular ID code received are not in a correct relationship. And when a certain period of time has elapsed since the comparison timing code was received (stored in another comparison timing code storage means) In some cases, the determination is made indirectly such as In addition, erasure includes various modes such as deleting stored data itself, setting a flag or the like to prevent access, and updating with other data. Furthermore, when updating with another data, for example, it is preferable to update to a correct comparison timing code. Thereby, since the correct comparison timing code is stored in all the comparison timing code storage means after the update, when the timing code determination means next accesses the comparison timing code storage means for the determination process, Regardless of the data stored in any storage means, it is preferable because a correct comparison time code can be acquired at the first time.

  In order to achieve the above object, a device control system according to the present invention includes a portable device that transmits control data, and a parent that outputs an operation command signal to the device based on the control data transmitted from the portable device. The portable device is stored in the ID code storage means for storing the ID code for identifying itself, the time code generation means for generating the time code updated every time it is transmitted, and the ID code storage means Data generating means for generating the control data at regular intervals based on the ID code and the time code generated by the time code generating unit, and the master unit includes receiving means for receiving the control data , ID code determination means for determining whether or not the ID code included in the control data received by the reception means is a regular ID code, and the regular code received last time A time code storage means for storing a time code included in the control data including the ID code; a time measuring means for measuring an elapsed time since receiving the control data including the last regular ID code; and the time code storage means The time code stored last time and the time code for comparison are obtained from the elapsed time obtained by the time measuring means, and the time code for comparison is compared with the time code included in the control data received this time. And control for controlling the device when the determination results of the time code determination means for determining whether the current received code is correct, the ID code determination means, and the determination result of the time code determination means are both correct Means are provided.

  When the control data is transmitted from the portable device at regular intervals, if the parent device cannot receive the control data, the timing data on the portable device side greatly advances. Therefore, after that, when the master unit becomes ready to receive, the first control data is judged to be incorrect even if the control data from the legitimate portable device has a large difference between the timekeeping data on the parent device side and the portable device side. End up. Therefore, time measuring means is provided, the number of updates (number of control data sent from the portable device) is obtained from the elapsed time since the previous reception, the time measuring data emitted from the regular portable device is estimated, and this time received By determining whether or not the measured time data has a predetermined relationship, it can be determined that it is correct from the first reception.

  Further, on the premise of the above configuration, the portable device may have a function of outputting forced control data based on operation of an operation switch, and the transmission timing of the forced control data may be adjusted to the predetermined interval. . By matching the transmission timing of the forced control data with the transmission timing of the control data that is automatically transmitted, there is no shift in the timing data between the portable device and the parent device, and there is no need for complicated judgment processing. The forced control data can be recognized as correct by the time data estimation process based on the time measuring means on the machine side.

  Furthermore, the portable device is provided with an initial value generating means for generating an initial value of a time code, and the time code generating means adds the time code to the initial value generated by the initial value generating means. Then, the addition time code is calculated, and thereafter, a function to calculate the next addition time code by adding the updated time code to the addition time code is obtained. The addition time code included in the control data including the regular ID code is stored in the time code storage unit, and the addition time code stored in the time code storage unit and the addition time code received this time Comprising a comparison time code storage means for storing the difference as a comparison time code, the time code determination means, when receiving the control data including the regular ID code next time, And determining the difference between the addition time code included in the control data and the previously received addition time code stored in the time code storage unit, the difference and the elapsed time determined by the time measuring means, and the time It may be configured to determine whether or not the control data received this time is correct based on the data stored in the comparison time code storage unit.

  In this way, since the history of changes in the control data (time data) that is actually output changes as the initial value changes, even if the portable device is stolen, the update rule for the time data is difficult to decipher. Security.

  An apparatus targeted by the present invention is, for example, a vehicle security device whose operation is controlled by a remote control operation. That is, there are vehicle door locks, immobilizers, luggage cases for motorcycles, key covers, theft monitoring devices, and the like. Further, the present invention is not limited to these vehicles. For example, a device for controlling the unlocking / locking of a general house door lock with a remote controller, a device for opening / closing a door such as a house / garage (from a portable device) In addition to devices that automatically open and close based on signals, intrusion monitoring devices in a house or a predetermined site, etc., any device whose operation is controlled by remote control operation is included in the present invention.

  In the present invention, each time control data is transmitted, in a system that uses control data including a different updated timing code, the timing code determined to be incorrect is temporarily stored and held, and then the timing included in the received control data Since the function to compare the data and the data stored in the temporary storage is provided, the clock code transmitted from the legitimate portable device has advanced beyond the allowable range on the parent device side for other reasons. Even if it is, it can be determined that it is correct in the next reception. In addition, the control data from the portable device forged based on the illegally copied data is not updated because the time measurement data is not updated, and the same data is sent every time.

  FIG. 2 shows a first embodiment of a device control system according to the present invention. As shown in the figure, a portable device 10 having a transmission function and a master device 20 that performs security control such as opening / closing control on a door lock based on a signal transmitted from the portable device 10 are provided. The specific configuration is as follows.

  First, the portable device 10 includes an ID code storage unit 11 that stores an ID code for identifying itself, and a time code generation unit 12 that generates a time code in which data content is updated every transmission. The time code generator 12 prepares a plurality of numerical values, increments the state each time transmission processing is performed according to a predetermined rule, and outputs the next numerical value as a time code. Note that the plurality of numerical values may be numerical values arranged at random as shown in FIG. 1, for example, or may be consecutive numerical values. In the case of continuous numerical values, all the numerical values may be held, the initial value, the end value, and the number of steps are stored, and the corresponding numerical value is obtained by calculation each time, and the time code is also obtained. Good.

  Further, an operation switch button (not shown) is provided so as to be exposed on the surface of the portable device 10, and when the transmission instruction unit 13 detects that the operation switch button has been pressed, a transmission command is generated and transmitted. Part 14 is given. There may be one operation switch button or a plurality of operation switch buttons. In a plurality of cases, information indicating which switch is pressed is also sent to the data generation / transmission unit 14.

  The data generation / transmission unit 14 generates a code (control data) to be transmitted using the time measuring code. In other words, when a transmission command is received from the transmission instruction unit 13, the ID code stored in the ID code storage unit 11 is read out, and the time code generation unit 12 is requested to issue a time code. When receiving the issuance request, the time code generating unit 12 generates a time code composed of a numerical value (according to the predetermined rule described above) different from the numerical value issued last time, and returns it to the data generating / transmitting unit 14 as a response. Therefore, the data generation / transmission unit 14 adds a timing code to the acquired ID code, and generates control command data including other necessary data (such as operation contents specified by the operation button switch). It should be noted that the time code is assigned to the ID code can take various methods such as adding the time code after the ID code or generating the ID code and the time code by performing a predetermined calculation. . The data generation / transmission unit 14 transmits the generated code to be transmitted (control signal) via the transmission antenna 15. In addition, since the function of the portable device is basically the same as that of the conventional device, detailed description thereof is omitted.

  The base unit 20 includes a receiving unit 22 that receives a code (control data) from the portable device 10 captured via the receiving antenna 21. The receiving unit 22 analyzes the received code and extracts an ID code and a time code. That is, when the code generated by the portable device 10 is obtained by adding a time code after the ID code, each code can be easily separated and extracted based on the number of bits from the head. In addition, when arithmetic processing is performed, it can be obtained by performing reverse arithmetic processing.

  The ID code and the time code extracted by the receiving unit 22 as described above are given to the ID code comparing unit 23 and the time code comparing unit 24, respectively. Then, the ID code comparison unit 23 reads the ID code stored in the ID code storage unit 25, determines whether or not it matches the received ID code, and determines the determination result as the time code comparison unit 24 and the security control unit. 27. The ID code storage unit 23 stores the same code as the ID code stored in the ID code storage unit 11 of the corresponding portable device 10. Thereby, it can be determined whether or not the data is transmitted from the corresponding portable device 10.

  The time code comparison unit 24 compares the comparison time code stored in the comparison time code storage unit 26 with the time code received this time, and determines whether or not the time code is correct. This determination can be basically made by a method similar to the conventional method. That is, since the master code 20 has a known time code update rule in the time code generation unit 12 of the corresponding portable device 10, the time code received according to the update rule is stored in the comparative time code storage unit 26. It is determined whether or not the timing code is next to the previously received timing code or within a certain number of times.

  As an example, if the timing code is a value from 0 to 100, and increments by 1 each time it is updated, and then reaches 100, then the master unit 20 stores the timing code stored in it. For example, if it is within 10 from the received timing code, it is determined that they match (correct), and if they are different by 11 or more, it is determined that they do not match (incorrect).

  Then, the determination result is given to the security control unit 27. Thereby, in the security control unit 27, when the determination result of the ID code comparison unit 23 is “match” (correct) and the determination result of the time code comparison unit 24 is “correct”, the security control unit 27 It is determined that the control signal from the portable device 10 is received, and a predetermined control operation is performed. That is, for example, in the case of door lock opening / closing control, unlocking / locking is performed. Which processing is performed, for example, if it is incorporated in the received data (control signal), it should be followed, the current state is recognized, and the reverse (current is the solution). If it is locked, it can be locked).

  Here, in the present invention, the time code received this time acquired by the time code comparison unit 24 is determined by the comparison result of the ID code comparison unit 23 regardless of the determination result of the time code comparison unit 24. If there is, the time code received this time is stored in the comparative time code storage unit 26, and the stored content is updated. That is, when the determination result of the time code comparison unit 24 is “correct”, the received time code is stored in the comparison time code storage unit 26, so that it becomes a code one before the next time code to be received. Correct judgment processing can be performed.

  On the other hand, if the time code on the portable device 10 side has greatly advanced due to “Karauchi” or the like, the determination result in the time code comparison unit 24 is “incorrect”, and security control is performed based on this reception. Although the unit 27 does not operate, the timing code received this time is stored in the comparison timing code storage unit 26, so that the timing code of the code subsequently transmitted from the portable device 10 is determined to be correct. . Therefore, even in a situation where it is not possible to determine whether the code matches due to “Karauchi” of the regular portable device 10, it is possible to synchronize the timekeeping code of the portable device 10 and the parent device 20 by two operations of the transmission instruction unit. it can.

  On the other hand, even if data including an ID code and a timing code copied from a fake portable device created by illegally copying the code of the portable device 10 is transmitted, the same timing code is transmitted every time. Since the time code received at the same time is the same as the time code for comparison (previously received) stored in the comparative time code storage unit 26, the determination result of the time code comparison unit 24 is “incorrect”. The security control unit 27 does not operate.

  FIG. 3 shows the base unit 20 used in the second embodiment of the present invention. Since the portable device side is the same as that of the first embodiment, illustration and description thereof are omitted.

  As shown in FIG. 3, in the present embodiment, a plurality (two) of time code storage units for comparison are provided. In other words, the first comparison timing code storage unit 26a and the second comparison timing code storage unit 26b are provided. Then, when the comparison result in the ID code comparison unit 23 “matches”, the time code comparison unit 24a performs a comparison process with the time code stored in the first comparison time code storage unit 26a, and receives the time measurement received this time. Determine if the code is correct. That is, suppose that the first comparison timing code storage unit 26a stores and holds the timing code when it was received correctly last time, as in the comparison timing code storage unit 26 in the first embodiment. In this regard, the comparison determination process itself can be performed by the same processing algorithm as that of the time code comparison unit 24 in the first embodiment. That is, the update condition of the time code in the time code generation unit 12 of the corresponding portable device 10 is acquired (increment by 1 / phenomenon, random numerical sequence is selected in order, etc.), and whether or not the update condition is met. Judging.

  Then, the determination result of the time code comparison unit 24a is given to the security control unit 27. The security control unit 27 indicates that the output of the ID code comparison unit 23 is "match" (correct), and the output of the time code comparison unit 24a is If “correct”, perform desired security control. Furthermore, when the determination result is “correct”, the time code comparison unit 24a stores (updates) the time code received this time in the first comparison time code storage unit 26a.

  On the other hand, if the comparison result of the comparison timing code stored in the first comparison timing code storage unit 26a and the currently received timing code is “incorrect”, the received timing code is used as the second comparison timing code. Stored in the code storage unit 26b. Then, the next received timing code is compared with each timing code stored in each of the first and second comparison timing code storage units 26a and 26b, and the correct relationship with one of the two comparison timing codes ( If it is within a predetermined number of times from the stored comparison time code, it is determined that the received time code is correct.

  As a result, as in the first embodiment described in detail, even if the timekeeping code of the regular portable device 10 has advanced beyond the allowable range due to “Karauchi”, it is confirmed that it is normal by two transmission operations. The security control unit 27 performs control.

  In addition, if the data from the regular portable device 10 cannot be received as normal data due to noise or the like, the ID code can be recognized by chance, and the time code is incorrect (the numerical value exists as a regular time code). In the first embodiment, the “wrong timing code” that has been recognized is the comparative timing code storage unit 26. Will be stored. That is, the correct comparison timing code is updated to an incorrect comparison timing code.

  Then, even if the original normal timing code is received, it may be determined to be incorrect (even in this case, it is determined that it is correct in the next reception, so it can be used. ). Even in such a case, in the present embodiment, even if the “wrong timing code” is stored in the second comparison timing code storage unit 26b, the correct timing code received before that is the first comparison timing code. Since it is stored in the storage unit 26a, the next time it correctly receives the time code, it is determined to be correct by comparison with the comparison time code stored in the first comparison time code storage unit 26a.

  Further, in the comparison process in the second time code comparison unit 24a, if the received time code is determined to be correct, the target time code for comparison determined to be correct is left, and the other comparison code is used. Delete (initialize) the time code. At this time, the handling is performed when the comparison timing code stored in the second comparison timing code storage unit 26b is correct, but the first comparison timing code storage unit 26a is simply initialized (first method). Alternatively, the data in the second comparison timing code storage unit 26b may be transferred to the first comparison timing code storage unit 26a (second method).

  In the case of the first method, the time code comparison unit 24a accesses the first and second comparison time code storage units 26a and 26b when storing the received time code, and stores data in both. If so, a comparison process is performed with each. Then, if it is initialized (comparison timing code is not stored), it may be compared with one comparison timing code.

  In the case of the second method, first, the comparison time code is compared with the comparison time code stored in the first comparison time code storage unit 26a. It is possible to make a comparison with the comparative timing code stored in 26b. Even in the case of adopting the second method in this way, each comparison timing code stored in the first and second comparison timing code storage units 26a and 26b is not lightly weighted as in the first method. You may make it call and compare.

  More specifically, for example, when the stored timing code for comparison is “95”, it is determined that the timing codes are within 10, that is, from “96 to 100, 0 to 4”. If they do not match, 95 is stored as it is, and the received time code (for example, “32”) is stored, and when it is received next, “33 to 42” or “96 to 100, 0 to 4” is stored. If there is, it is determined that the timing codes match. Also, in this case, if it matches the comparative timing code based on “32”, the comparative timing code “95” is initialized, and if it matches the comparative timing code based on “95”, it is for comparison. The time code “32” is initialized.

  Furthermore, in the case where the timing code does not match any of the comparison timing codes even after the second reception, the processing of the timing code received this time to the comparison timing code storage unit storing the previously received timing code is performed. Is stored and updated. As a result, the time code received this time becomes the time code for comparison when the time code received next time is compared. Specifically, when the above-described second method is adopted, it is stored in the second comparison time code storage unit 26b. Further, when the first method is adopted, for example, it can be dealt with by making it possible to recognize a comparative timing code storage unit storing a timing code immediately before using a flag or the like.

  As another function, when a predetermined time has elapsed from the first reception when the time code is determined to be incorrect to the second time, a comparison code storing the time code determined as incorrect is stored. The time code storage unit (26a or 26b) may be initialized. In other words, in the case of a regular user, if the mobile device does not operate even if it is operated once, it is usually operated repeatedly several times, so if there is no next reception for a certain period of time, There is a possibility of fraudulent use, and in any case, there is a high possibility that it was an incorrect timing code. Therefore, by deleting (initializing) the comparative timing code based on the erroneous timing code, the processing time becomes longer by comparing with the erroneous comparison timing code, or the erroneous comparison timing code. It is possible to eliminate the possibility of misjudging as correct based on the above.

  In addition, instead of actively initializing in this way, the time from the last reception is measured, and the comparison clock that stores the comparison code that was determined to be incorrect last time only when the time is within a predetermined time. The code storage unit may be configured to be compared. As a result, when a predetermined period or more elapses, it is not subject to comparison (excluded from the access target), and processing delay due to useless access is eliminated. In the case of the first method described above, it is possible to determine a target for which access is prohibited by recognizing a comparative timing code storage unit that stores a timing code determined to be incorrect by a flag or the like. In the case of the second method, the second comparison time code storage unit 26b is excluded from the access target.

  That is, in the present embodiment, two comparative timing code storage units are prepared, and when the received timing codes do not match (determine that they are not correct), one storage unit stores the previously received timing code. What is necessary is just to memorize | store the timing code received this time in another memory | storage part, and the exchange in a memory | storage part is not a problem. If the time code does not match after that (it is not determined to be correct), the memory of the original time code is kept until the time is matched, and the time code received for the second time or later is used for comparison. Update as code.

  If they do not match, keep the currently stored timing code, store the received timing code, and the next received timing code (second timing code) matches one of the two timing codes. It is determined that the timekeeping codes coincide with each other.

  4 and 5 show a third embodiment of the present invention. In the present embodiment, it is assumed that the portable device 10 is an automatic transmission type and performs intermittent transmission. The operation that is the premise of the present embodiment will be described. Control data is transmitted from the portable device 10 at regular intervals (for example, 1 second). This control data is data generated by adding a timing code to at least the ID code, as in the above-described embodiments.

  On the other hand, the base unit 20 determines whether or not the control data has been received from the corresponding portable device 10, and if received, the portable device 10 and thus the user within a certain range from the vehicle (vehicle). It can be determined that it exists. Therefore, for example, when the control data related to this time is received without being received last time, it can be estimated that the user has entered a certain range and is approaching the vehicle. When the reception stops, it can be determined that the vehicle has gone out of a certain range (away from the vehicle). The presence / absence of reception may literally be simply received or may be discriminated based on whether or not the signal strength (electric field strength) of the received control data is equal to or higher than a certain threshold value. good.

  And the main | base station 20 performs predetermined | prescribed security control with approach / separation to a vehicle. That is, when the content of the security control is locking / unlocking of the door lock, the security control is unlocked when approaching within a certain range, and is locked when it is separated. In the case of a theft prevention monitoring device, the monitoring is canceled when approaching, and the monitoring is started when moving away. And the concrete apparatus structure for implement | achieving the said function is as follows.

  First, as shown in FIG. 4, the portable device 10 includes an intermittent transmission instruction unit 16 instead of the transmission instruction unit 13 in the first and second embodiments. The transmission instructing unit 13 is operated by pressing an external operation switch button as a trigger. The intermittent transmission instructing unit 16 generates and transmits data at regular time intervals (for example, 1 second) based on an internal timer (timer unit). A transmission command is given to the unit 14.

  On the other hand, the ID code storage unit 11, the time code generation unit 12, the data generation / transmission unit 14, and the like are the same as those in each of the above-described embodiments, and accordingly, according to the transmission instruction per second from the intermittent transmission instruction unit 16, The data generation / transmission unit 14 acquires the ID code and the time code from the ID code storage unit 11 and the time code generation unit 12, generates control data, and transmits the control data from the transmission antenna 15. As a result, control data is transmitted from the transmission antenna 15 at intervals of 1 second, and each control data has its time code updated one by one.

  On the other hand, in addition to the structure of 1st Embodiment, the main | base station 20 side is provided with the time measuring part 28. FIG. The time measuring unit 28 measures the elapsed time from when the previous ID code was normally received (previous reception). In other words, when the portable device 10 is of the automatic transmission type, the control code is constantly transmitted and the timing code is updated regardless of whether or not the reception is performed on the base unit 20 side. The time code when it is first received from the state in which it is not received is in a state of being greatly advanced with respect to the comparison time code stored in the comparative time code storage unit 26.

  Therefore, in the present embodiment, the time count from the previous reception is measured by the time measuring unit 28 to estimate the number of times the time code is updated in the portable device 10 and the comparison time code (estimated value) when received this time is obtained. The time code for comparison (estimated value) is compared with the time code received this time, and it is determined whether or not it is correct. Thereby, in the case of reception from the legitimate portable device 10, it can be determined that it is correct from the first reception.

  More specifically, it is as follows. First, the ID code and the time code included in the control data from the portable device 10 received by the receiving unit 22 via the receiving antenna 21 are extracted and provided to the ID code comparing unit 23 and the time code comparing unit 24b. The ID code comparison unit 23 compares the received ID code with the ID code stored in the ID code storage unit 25 and gives the determination result to the security control unit 27, as well as the time code comparison unit 24 b and the time measurement unit 28. Also give. Further, the previously received timing code is stored in the timing code storage unit 26 '. In the present embodiment, the time code stored in the time code storage unit 26 'is not used as it is as a comparison time code, and is therefore referred to as the time code storage unit 26'. The process is substantially the same as the comparative time code storage unit 26 in the first embodiment because the previously received time code is stored.

  When the timer 28 receives a “match (correct)” determination result from the ID code comparison unit 23, the timer 28 starts a timer and measures the time until the next determination result is received. The time code comparison unit 24b presupposes the coincidence of the ID codes and receives the received time code and a comparison time code estimated and calculated based on the last time code stored in the time code storage unit 26 ′. A comparison is made to determine whether the timekeeping code is correct.

  The determination as to whether or not the timekeeping code is correct is made by comparing the elapsed time (obtained from the timekeeping unit 28) from the time when it was last received to the time when it was received this time and the timekeeping code received last time stored in the timecode storage unit 26 '. A timekeeping code (estimated value) was generated, and when the comparative timekeeping code (estimated value) and the received timekeeping code were in the correct relationship, a normal timekeeping code was received.

  For example, when the transmission interval of the portable device 10 is 1 second, the timing code is a rolling code from 0 to 100, and is incremented by 1 each time it is updated. If the elapsed time from 2 hours 59 minutes (10799 seconds), the time code to be received at that time is obtained by adding the elapsed time (10799) to the time code (for example, “38”) in the time code storage unit. Then, the remainder (37) of the value obtained by dividing it by 100 is used as a comparative timing code.

  In this case, the rolling code is taken as an example. However, when the transmitter and the receiver use a random code format having a similar numerical table, a comparative timing code can be generated by the same method.

  For example, assuming that the numerical table is (2, 5, 1, 8, 4, 3), the previous time code stored in the time code storage unit 26 'is "1", and the elapsed time is 2 hours 59 If it is minutes (10799 seconds), the numerical value “1” is in the third position of the numerical value table because the numerical value table is composed of six numerical value tables. Therefore, the elapsed time (10799 seconds) is added to the position (3) of the numerical table indicated by the time code storage unit 26 ', and the remainder (2) obtained by dividing it by 6 stores the comparative time code. Indicates the position (second) from the beginning of the numerical table. That is, the comparative timing code in this case is “5”.

  The security control unit 27 performs desired control when the determination result of the time code comparison unit 24b ′ is correct. Regardless of the determination result in the time code comparison unit 24b, the time code received this time is stored in the time code storage unit 26 'to prepare for the next comparison determination process. The specific configuration, processing algorithm, and the like are the same as those in the first embodiment described above, and thus detailed description thereof is omitted.

  In the above-described embodiment, the timing code comparison unit 24b is provided with a function of calculating the comparison timing code from the previously received timing code stored in the comparison timing code storage unit 26. The present invention is not limited to this, and a means for calculating a comparative timing code may be provided separately.

  Of course, in the present invention, the portable device 10 in the first and second embodiments may be replaced with the automatic transmission type portable device (shown in FIG. 4) in the present embodiment. With such a configuration, the comparison result with the comparison timing code is usually incorrect when it is received first, but it is determined to be correct when received for the second time.

  6 and 7 show a fourth embodiment of the present invention. This embodiment is based on the third embodiment, and further has a data transmission function based on a user's manual operation, as in the first and second embodiments.

  That is, in addition to the automatic processing in the third embodiment described above, a manual operation by the user, that is, a forced operation by pressing an operation switch provided on the portable device 10 can be performed. In other words, on the premise that the radio wave (control data) from the portable device 10 is within a range that can be received by the parent device 20, control different from control based on automatic processing can be performed. Specifically, when the door is locked or the monitoring process is started while it is within a certain range, or when the automatic process is unlocked when a radio wave with a certain signal strength or higher is received. It is used when the unlocking is forcibly performed even when the signal intensity is below a certain level (outside a certain range).

  As a specific configuration, as shown in FIG. 6, the portable device 10 further includes a transmission instruction unit 13 in the portable device of the third embodiment. The transmission instruction unit 13 is the same as the transmission instruction unit 13 in the first and second embodiments. When the operation switch button is pressed, the transmission instruction unit 13 detects the operation switch button and sends a transmission command to the data generation / transmission unit 14. send. When the data generation / transmission unit 14 receives a transmission command from the transmission instruction unit 13, the data generation / transmission unit 14 generates control data including a manual code in addition to the ID code and the timing code, and transmits the control data at a predetermined timing.

  For example, as shown in FIG. 8A, when data is transmitted immediately according to the instruction from the transmission instruction unit, the transmission timing at regular intervals based on the transmission instruction from the intermittent transmission instruction unit 16 is shown. Is transmitted at a timing different from that of the master unit 20, and therefore, the generation of a comparative timing code based on the timing time on the base unit 20 side is out of order, causing a problem. Therefore, in the present embodiment, as shown in FIG. 8B, transmission is not performed immediately after a transmission instruction is issued, but data with a manual code is transmitted at the next intermittent transmission timing. When transmitting the control data to which the manual code is added, periodic transmission of control data based on a transmission instruction from the intermittent transmission instruction unit 16 is not performed. Other configurations and processing functions thereof are the same as those in the third embodiment described above, and detailed description thereof is omitted.

  On the other hand, as shown in FIG. 7, the base unit 20 is provided with a manual code detection unit 29 in the configuration of the base unit in the third embodiment. Then, the receiving unit 22 analyzes the received control data, and passes the extracted ID code and timing code to the ID code comparison unit 23 and the timing code comparison unit 24b, respectively, in the same manner as each of the embodiments described above. It is determined whether or not the control data received by the unit is from the legitimate portable device 10, and if it is correct, the security control unit 27 performs a desired control operation. Further, as described above, since the control data based on the manual operation is also transmitted from the portable device 10 at the same timing as the periodic transmission timing by the automatic processing by the instruction from the intermittent transmission instructing unit 16, Accurate determination processing can be performed by using the comparative timing code calculated based on the obtained elapsed time from the previous reception. The determination algorithm and the subsequent basic processing are the same as those in the third embodiment.

  In the present embodiment, when the manual code detection unit 29 detects that the received control data includes a manual code, the detection notification is given to the security control unit 27. That is, since the position where the manual code is added (bit position from the beginning of the control data, etc.) is known, the receiving unit 22 gives the data of the relevant part to the manual code detecting unit 29, and the manual code detecting unit 29 Then, it is determined whether or not the received data is a manual code.

  When the security control unit 27 does not acquire the manual code detection notification, the received control data is based on automatic processing that is periodically transmitted, and thus the same processing as in the third embodiment. I do. Further, when the detection notification is acquired, since it is a forced command signal by manual operation, the security control unit 27 performs processing according to the content of the forced command signal. Note that the content of the forced command signal can be defined by a manual code, for example. In addition, since another structure and an effect are the same as that of each above-mentioned embodiment, the same code | symbol is attached | subjected to a corresponding member and the detailed description is abbreviate | omitted.

  9 and 10 show a fifth embodiment of the present invention. The present embodiment is based on the third embodiment, and further includes an initial value generation unit 17 in the portable device 10, and the initial value generation unit 17 randomly generates an initial value of the timekeeping code of the portable device 10. Any value to be used.

  The time code generating unit 12 acquires the initial value of the time code from the initial value generating unit 17, and thereafter updates the time code every time data is transmitted (whenever there is a request from the data generation / transmission unit 14). Yes. That is, the time code generator 12 outputs the value generated by the initial value generator 17 first as a time code (time code A). The time code generated by the time code generator next is the sum of the time code A and the time code B generated by the time code generator itself using a rolling code (continuous number) or a numerical code table, and outputs the result as an added time code. When the time code generated by the time code generation unit becomes a predetermined value or a predetermined value or more, the addition time code is initialized, and an initial value is obtained from the initial value generation unit 17 to generate an addition time code.

  As a specific example, for example, the time code B is set to the rolling code method generation (0), the predetermined value for initializing the addition time code is 100, and when the first addition time code is output from the initial value generation unit The time code A (3) read and added to the time code B is output as the added time code (3). Next, when generating the time code, the time code 1 is added to the previously added time code (3) to output the time code (4). Further, since the time code B advances by one (2) for the next addition time code, (6) is obtained by adding it to the current addition calculation time code (4).

  By repeating the same, the addition output code becomes 3 → 4 → 6 → 9 → 13 → 18 → 24 → 31 → 39 → 48 → 58 → 69 → 81 → 94. Next to 94, 108 is 108, but since the predetermined value to be initialized is 100, the added time code and time code B are initialized and the initial value is newly read from the initial value generator 17 (for example, “8”). Repeat in the same way. As is clear from the specific examples of the numerical values described above, the difference value before and after the added output code is equivalent to the time code B, that is, the time code in each of the above embodiments.

  This state is shown in a flowchart in FIG. Note that the above example is based on the assumption that a rolling code is used, but the present invention can be similarly applied to a numerical table in which numerical values are randomly arranged as shown in FIG.

  On the other hand, as shown in FIG. 10, the base unit 20 is based on the configuration of the third embodiment, and further includes a comparison time code storage unit 26 that is read and written by the time code comparison unit 24c. Then, the time code comparing unit 24c stores the first time code received in the time code storage unit 26 'regardless of the received time code. Next, the difference between the time code received the second time and the time code previously received (read from the time code storage unit 26 ') is stored in the comparative time code storage unit 26, and the value of the time code storage unit 26' is updated. To do. Then, the difference between the time code received at the third time and the second time code stored in the time code storage unit 26 ′ is obtained and compared with the previously obtained difference stored in the comparison time code storage unit 26. Determine whether the relationship is correct.

  That is, since the number of updates of the timekeeping code on the portable device 10 side from the previous reception to the current reception is known based on the elapsed time from the previous reception measured by the timekeeping unit 28, the comparative timekeeping code storage unit By adding the number of times of update to the difference stored in 26, it is possible to obtain the increment of the added time code from the previous reception to the current reception. Therefore, by adding the increment related to the previously received timing code stored in the timing code storage unit 26 ', a normal timing code (added output code) to be received this time is calculated, and it is actually received. It can be determined whether or not there is a correct relationship depending on whether or not it matches. Of course, other specific methods can be used for the determination process. In addition, since another structure and an effect are the same as that of each above-mentioned embodiment, the same code | symbol is attached | subjected to a corresponding member and the detailed description is abbreviate | omitted.

  Further, according to the present embodiment, the initial value is updated at an appropriate timing, so that even if it is intended to analyze the code to be transmitted, the analysis becomes difficult due to the change in the initial value. In this measure, it is assumed that the timing code is received three times. However, the security mechanism control device of the normal intermittent transmission type performs the determination based on the two conditions of the determination based on the received code and the electric field strength. Therefore, the code itself has been received before the determination is made. Therefore, performing the determination by receiving a plurality of times without the user being particularly conscious does not affect the actual use.

  In the above-described embodiment, the third embodiment is basically used. However, it can be incorporated in the fourth embodiment.

It is a figure which shows an example of the update algorithm of a time code. It is a block diagram which shows the 1st Embodiment of this invention. It is a block diagram which shows the main | base station of the 2nd Embodiment of this invention. It is a block diagram which shows the portable device of the 3rd Embodiment of this invention. It is a block diagram which shows the main | base station of the 3rd Embodiment of this invention. It is a block diagram which shows the portable device of the 4th Embodiment of this invention. It is a block diagram which shows the main | base station of the 4th Embodiment of this invention. It is a block diagram explaining the effect | action of the 4th Embodiment of this invention. It is a block diagram which shows the portable device of the 5th Embodiment of this invention. It is a block diagram which shows the main | base station of the 5th Embodiment of this invention. It is a figure explaining the effect | action of the 5th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Portable device 11 ID code memory | storage part 12 Timing code production | generation part 13 Transmission instruction | indication part 14 Data generation transmission part 15 Transmission antenna 16 Intermittent transmission instruction | indication part 17 Initial value production | generation part 20 Parent | base_device 21 Reception antenna 22 Reception part 23 ID code comparison part 24 24a, 24b, 24c Timing code comparison unit 25 ID code storage unit 26 Comparison timing code storage unit 26a First comparison timing code storage unit 26b Second comparison timing code storage unit 26 'Timing code storage unit 27 Security control unit 28 Timekeeping Unit 29 Manual Code Detection Unit

Claims (3)

A portable device for sending control data;
Based on the control data sent from the portable device, comprising a master unit that outputs an operation command signal to the device,
The portable device includes an ID code storage unit that stores an ID code that identifies the portable device, a time code generation unit that generates a time code that is updated each time it is transmitted, and the ID code stored in the ID code storage unit. A data generation means for generating the control data at regular intervals based on the time code generated by the time code generation unit;
The master unit is a receiving means for receiving the control data;
ID code determination means for determining whether or not the ID code included in the control data received by the reception means is a regular ID code;
Time code storage means for storing a time code included in the control data including the regular ID code received last time;
A time measuring means for measuring an elapsed time since receiving the control data including the last regular ID code;
A comparison timing code is obtained from the previously received timing code stored in the timing code storage means and the elapsed time obtained by the timing means, and is included in the comparison timing code and the control data received this time. Time code determination means for comparing the time code and determining whether the current time code is correct or not,
A device control system comprising control means for controlling the device when both of the determination results of the ID code determination means and the time code determination means are correct. The portable device has a function of outputting forced control data based on operation of an operation switch,
The device control system according to claim 1, wherein a transmission timing of the forcible control data is adjusted to the predetermined interval. The portable device is provided with an initial value generating means for generating an initial value of a timing code,
The time code generation means calculates an addition time code by adding the time code to the initial value generated by the initial value generation means, and thereafter updates the time count code for the addition time code. It has a function to calculate the next addition timing code by adding the code,
The master unit stores the addition timing code included in the control data including the regular ID code received last time in the timing code storage unit,
A comparison time code storage means for storing a difference between the addition time code stored in the time code storage unit and the addition time code received this time as a comparison time code;
When the time code determination means receives control data including a regular ID code next time, the time count code included in the control data and the previously received time count stored in the time code storage unit are received. Determine the difference from the code, and determine whether the control data received this time is correct based on the difference, the elapsed time obtained by the timekeeping means, and the data stored in the comparative timekeeping code storage unit The device control system according to claim 1 or 2, wherein the device control system is configured to do so.

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