JP2006161507A - Radio control system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio control system for a vehicle which prevents a transmission method of transmission data from being easily deciphered even when the transmission data are intercepted repeatedly. <P>SOLUTION: The radio control system 1 for the vehicle comprises a control part 3b, a transmission pre-processing means 3c and a transmission high frequency part 3d on the side of a key 3. The control part 3b designates the change of transmission method of the transmission data D for every operation of a button 3a (i.e., for every transmission of the transmission data D), and outputs the transmission data D including identification information d3 identifying the method of transmission designated to be changed and button data d4 corresponding to the content of operation of the button 3a. The transmission pre-processing means 3c conducts transmission pre-processing of the transmission data D from the control part 3b based on the transmission method designated to be changed by the control part 3b. The transmission high frequency part 3d radio-transmits the transmission data D, which are pre-processed by the transmission pre-processing means 3c, to an in-vehicle unit 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle radio control system that controls an in-vehicle device of a predetermined vehicle based on transmission data from a portable radio device.

  As this type of vehicle radio control system, for example, there is a keyless entry system that controls a door locking / unlocking device (on-vehicle device) of a predetermined car by transmission data from a car key (portable radio).

  In this keyless entry system 100, as shown in FIG. 3, when the button 103a on the key 103 side is pressed, transmission data including button data corresponding to the operation content of the button 103a is output to the pre-transmission processing means 103c by the control unit 103b. Then, the transmission data is pre-transmission-processed by a fixed transmission scheme (modulation scheme, communication speed, data format and encryption scheme) set in advance by the transmission pre-processing means 103c, and pre-transmission-processed by the transmission high-frequency unit 103d. The transmitted data is wirelessly transmitted to the in-vehicle unit 107 side (vehicle side). Then, when the transmission data is received by the reception high-frequency unit 107a on the in-vehicle unit 107 side, the received transmission data is processed by the post-reception processing means 107b after reception by a fixed reception method set in advance. Data is extracted, and the in-vehicle device 105 is controlled by the control unit 107c based on the extracted button data.

  In this way, in the conventional vehicle radio control system, the transmission method of transmission data (modulation method, communication speed, data format, and encryption method) is fixed, so that the transmission data transmission method can be changed by repeatedly intercepting the transmission data. There were drawbacks in that it could be easily deciphered and illegally controlled on-board equipment.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle radio control system that can prevent transmission data transmission methods from being easily deciphered even if transmission data is repeatedly intercepted.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a vehicle radio control system for controlling an in-vehicle device of a predetermined vehicle by transmission data from a portable radio device, wherein the portable radio device side A first changing unit that changes and designates a transmission method for each transmission of transmission data; a pre-transmission processing unit that preprocesses the transmission data in a transmission method that is changed and designated by the first changing unit; and the transmission preprocessing unit. Transmitting means for transmitting the transmission data that has been pre-processed by the transmission means, and receiving on the vehicle side the receiving means for receiving the transmission data, and corresponding to the transmission method of the transmission data received by the receiving means. Second change means for changing and specifying the reception method, and post-reception processing for processing the transmission data received by the receiving means after reception in the reception method changed and specified by the second change means. Means and, in which a control means for controlling the vehicle equipment on the basis of the transmission data processed after receiving by the reception post-processing means.

  According to a second aspect of the present invention, the transmission method is a modulation method, a communication speed, a data format or / and an encryption method.

  According to a third aspect of the present invention, the transmission data has a header part, and identification information for identifying a transmission method of the transmission data is included in the header part. Based on the identification information included in the header part, the reception method is designated to be changed.

  According to a fourth aspect of the present invention, the transmission data includes a header part and an actual data part, and the transmission preprocessing means is fixed to the header part of the transmission data every time the transmission data is transmitted. Pre-transmission in the transmission method and pre-transmission in the transmission method designated by the first change means for the actual data portion of the transmission data, and the post-reception means receives the transmission data Each time, the header portion of the transmission data is processed after reception by a fixed reception method and the actual data portion of the transmission data is received by the reception method specified by the second changing means. It is something to process.

  According to a fifth aspect of the present invention, the first changing means specifies and changes the transmission method according to a predetermined order, or generates a random number and changes and specifies the transmission method according to the random number.

  According to a sixth aspect of the present invention, the in-vehicle device is a door locking / unlocking device that locks / unlocks the door of the vehicle.

  According to the first aspect of the present invention, since the transmission method of transmission data is changed every time transmission data is transmitted on the portable wireless device side, even if transmission data is repeatedly intercepted, the transmission method of transmission data is easy. Can be prevented from being illegally deciphered. In addition, since the reception method is changed on the vehicle side in accordance with the transmission method used for the transmission data, the transmission data can be appropriately received on the vehicle side even if the transmission method of the transmission data is changed for each transmission.

  According to the second aspect of the present invention, since the transmission method is a modulation method, a communication speed, a data format or / and an encryption method, it is difficult to intercept and decrypt transmission data.

  According to the third aspect of the present invention, the identification information for identifying the transmission method is included in the header portion of the transmission data. On the vehicle side, the reception method is based on the identification information included in the header portion of the transmission data. Since it is changed, it is possible to change the reception method corresponding to the transmission method by a simple method on the vehicle side.

  According to the fourth aspect of the present invention, since the transmission data is subjected to pre-transmission processing with a fixed transmission method every time, the header portion of the transmission data is received after receiving the header portion without depending on the identification information included in the header portion. Thus, even if the transmission unit identification information is included in the header part, the identification information can be appropriately extracted from the header part on the vehicle side.

  According to the fifth aspect of the present invention, when the transmission method is designated for change according to a predetermined order, the transmission method can be designated for each transmission by a simple method. Further, when the transmission method is generated and specified according to the random number, the transmission method can be changed and specified for each transmission by a method that is more difficult to intercept.

  According to the invention described in claim 6, since the in-vehicle device is a door locking / unlocking device that locks / unlocks the door of the car, transmission data is intercepted and decrypted to prevent the door of the car from being illegally locked / unlocked. it can.

  As shown in FIG. 1, the vehicle radio control system 1 of this embodiment includes a vehicle-mounted device (here, door locking / unlocking) of a predetermined vehicle based on transmission data D from a portable radio device (here, a car key with a radio function) 3. Device), and comprises a key 3 carried by the user and an in-vehicle unit 7 mounted on the vehicle and controlling the door locking / unlocking device 5 based on transmission data D from the key 3. .

  The key 3 includes a button 3a for remotely operating the door locking / unlocking device 5, and a transmission method (that is, modulation method, communication) of the transmission data D every time the button 3a is operated (that is, every time transmission data D is transmitted). Transmission data D including identification information d3 for identifying the transmission method specified for the change and button data d4 corresponding to the operation content of the button 3a. A control unit 3b that outputs to the pre-transmission processing means 3c, and a pre-transmission process that performs transmission pre-processing (ie, modulation, data formatting, and encryption) on the transmission data D from the control unit 3b by a transmission method specified by the control unit 3b. A processing unit 3c and a transmission high-frequency unit (transmission unit) 3d that wirelessly transmits the transmission data D pre-transmission processed by the transmission pre-processing unit 3c to the in-vehicle unit 7 are provided. That.

  For example, (a) the transmission unit D may be sequentially specified for each transmission of transmission data D according to a predetermined order, or (b) the transmission data D A random number may be generated for each transmission and changed according to the random number. As described in (a) above, the transmission method can be changed and designated for each transmission by a simple method. Moreover, if it carries out like said (b), a transmission system can be changed and designated for every transmission by the method which is hard to intercept.

  The pre-transmission processing means 3c, for example, an encoding unit 3e that performs predetermined data processing (data formatting and encryption here) on the transmission data D from the control unit 3b, and transmission data D processed by the encoding unit 3e. And a modulation unit 3f for modulation.

  The encoding unit 3e has transmission data D from the control unit 3b, for example, having a data configuration as shown in FIG. 2 (that is, a header part D1 and an actual data part D2, and the header part D1 includes a preamble d1 and a synchronization in order from the head side. The data format includes the signal d2 and the identification information d3 of the transmission method, and the actual data portion D2 includes the button data d4.

  At that time, the encoding unit 3e formats the header portion D1 with a preset fixed data format, and transmits the actual data portion D2 among a plurality of preset data formats. Each time data D is transmitted, the data is formatted in the data format specified by the control unit 3b. Thereby, the data format of the transmission data D is fixed (same) every time the transmission data D is transmitted in the header part D1, and is changed every time the transmission data D is transmitted in the actual data part D2.

  Here, the data format of the header portion D1 means, for example, the arrangement of each data of the header portion D1, the encoding method, the bit arrangement order method, and the like. The data format of the actual data portion D2 means, for example, the arrangement of each data in the actual data portion D2, the encoding method, the bit arrangement order, the interleaving and scrambling methods, and the like.

  In addition, the encoding unit 3e, for the actual data portion D2 of the transmission data D, among the plurality of preset encryption methods, the encryption method designated by the control unit 3b for each transmission of the transmission data D Encrypt with Thereby, the encryption method of the transmission data D is changed every time the transmission data D is transmitted.

  The modulation unit 3f modulates the header portion D1 of the transmission data D with a preset fixed modulation method and communication speed (that is, with a fixed modulation method and communication speed every time transmission data D is transmitted). For the actual data portion D2 of the transmission data D, among the preset modulation schemes and communication speeds, the modulation scheme and communication speed specified by the control section 3b for each transmission of the transmission data D are changed. Modulate with. Thereby, the modulation method of the transmission data D is fixed (same) every time transmission data D is transmitted in the header part D1, and is changed every time transmission data D is transmitted in the actual data part D2.

  By such processing in the transmission preprocessing means 3c, the transmission method of the header part D1 of the transmission data D is fixed (same) every time transmission is performed, and the transmission method of the actual data part D2 of the transmission data D is transmitted. Changed every time.

  The in-vehicle unit 7 is a reception high-frequency unit (reception means) 7a that receives transmission data D from the key 3 and a reception method in which the transmission data D received by the reception high-frequency unit 7a is specified by the control unit 7c described later. A post-reception processing means 7b that performs post-reception processing (ie, demodulation, data extraction, decryption, etc.) and a reception method (ie, demodulation) of transmission data D corresponding to the transmission method of transmission data D received by the reception high-frequency unit 7a The system, the communication speed, the data format, and the decryption method), and controls the door locking / unlocking device 5 based on the button data d4 included in the transmission data D processed after reception by the post-reception processing means 7b. And a control unit (second changing means, control means) 7c.

  The post-reception processing means 7b includes, for example, a demodulation unit 7d that demodulates the transmission data D received by the reception high-frequency unit 7a, and predetermined data processing (here, data extraction and encryption) on the transmission data D demodulated by the demodulation unit 7d. And a decoding unit 7e for decoding.

  The demodulator 7d corresponds to the fixed predetermined modulation scheme and communication speed set in advance for the header portion D1 of the transmission data D (that is, the fixed modulation scheme and communication speed used for the modulation of the header portion D1). Control unit 7c for each reception of transmission data D among a plurality of preset demodulation methods and a plurality of communication speeds, for real data portion D2 of transmission data D. The data is demodulated at the demodulation method and communication speed specified by the change (that is, the demodulation method and communication speed corresponding to the modulation method and communication speed used for modulation of the actual data portion D2).

  For the header part D1 of the transmission data D, the decoding unit 7e transmits data such as identification information d3 of the transmission method based on a predetermined fixed data format (data format used for the header part D1). For the actual data part D2 of the transmission data D, the data format (that is, the actual data part) designated by the control unit 7c for each reception of the transmission data D among a plurality of data formats set in advance. Data such as button data d4 is extracted based on the data format used for D2.

  In addition, the decoding unit 7e, for the actual data part D2 of the transmission data D, out of a plurality of preset decryption systems, the decryption system (c. That is, the decryption is performed by the decryption method corresponding to the encryption method used for the actual data portion D2.

  In this way, in the post-reception processing means 7b, for the header part D1 of the transmission data D, a predetermined fixed transmission method (that is, a reception method corresponding to the transmission method used for the header part D1) is set. For the actual data portion D2 of the transmission data D that has been processed after reception, the reception method specified by the control unit 7c every time the transmission data D is received (that is, corresponds to the transmission method used for the actual data portion D2). Is processed after reception.

  The control unit 7c changes and specifies the reception method of the transmission data D based on the transmission method identification information d3 extracted by the decoding unit 7e (that is, changes and specifies the reception method corresponding to the transmission method of the transmission data D). Then, the reception post-processing means 7b (that is, the demodulating unit 7d and the decoding unit 7e) uses the change-designated receiving method to process the post-reception processing (demodulation, data extraction and data extraction) of the actual data part D2 of the transmission data D as described above. Decrypt). And the control part 7c controls the door locking / unlocking apparatus 5 based on the button data d4 extracted by the decoding part 7e.

  Next, the operation of the vehicle radio control system 1 will be described.

  When the button 3a on the key 3 side is operated, the transmission unit (that is, each of the modulation method, communication speed, data format, and encryption method) of the transmission data D is changed and specified by the control unit 3b on the key 3 side. The transmission data D including the identification information d3 for identifying the transmission method and the button data d4 corresponding to the operation content of the button 3a is output from the control unit 3b to the pre-transmission processing means 3c.

  Then, by the transmission preprocessing means 3c, the transmission data D from the control unit 3b has, for example, a data structure as shown in FIG. 2 (that is, the header part D1 and the actual data part D2). The data is formatted into a data configuration including the preamble d1, the synchronization signal d2, and the identification information d3 of the transmission method, and the actual data portion D2 including the button data d4. At that time, the header part D1 is subjected to pre-transmission processing (data formatting and modulation) by a preset fixed transmission method (modulation method, communication speed and data format), and the actual data part D2 is Each time transmission data D is transmitted, pre-transmission processing (modulation, data formatting, and encryption) is performed by the transmission method (modulation method, communication speed, data format, and encryption method) specified by the control unit 3b.

  The transmission data D pre-transmission processed by the transmission pre-processing means 3c is wirelessly transmitted from the transmission high-frequency unit 3d to the in-vehicle unit 7 side (vehicle side).

  In this way, each time the key 3 is operated, the transmission data D including the transmission method identification information d3 in the header portion D1 and the button data d4 in the actual data portion D2 becomes the transmission method of the header portion D1. Is fixed every time transmission is performed, and the transmission method of the actual data portion D2 is changed every time transmission data D is transmitted, and is wirelessly transmitted from the key 3 to the in-vehicle unit 7 side.

  When the transmission data D is received by the reception high-frequency unit 7a on the in-vehicle unit 7, the post-reception processing unit 7b first performs post-reception processing on the header D1 of the transmission data D by a fixed reception method set in advance. (Extraction of identification information d3 of the demodulation and transmission method), and the control unit 7c changes and specifies the reception method of the transmission data D based on the extracted identification information d3 of the transmission method. The real data portion D2 of the transmission data D is then subjected to post-reception processing (demodulation, decryption and extraction of button data d4) by the change-designated reception method by the post-reception processing means 7b, and the control portion 7c extracts the data. The door locking / unlocking device 5 is controlled based on the button data d4. In this way, the door locking / unlocking device 5 is controlled by the transmission data D from the key 3.

  According to the vehicle radio control system 1 configured as described above, since the transmission method of the transmission data D is changed every time transmission data D is transmitted on the portable radio device (key 3) side, the transmission data D is repeatedly intercepted. Even if this is done, it is possible to prevent the transmission scheme of the transmission data D from being easily deciphered. Further, since the reception method is changed on the vehicle side (on-vehicle unit 7 side) corresponding to the transmission method used for the transmission data D, it is appropriate on the vehicle side even if the transmission method of the transmission data D is changed for each transmission. The transmission data D can be received.

  In order to illegally decode the transmission data D, it is necessary to prepare a number of receivers having different communication speeds from the modulation method and intercept them, and to determine the regularity of changes in the modulation method and communication speed. It is impossible to see through the format and encryption method, and since the data format and encryption method are changed every time, the decryption becomes very difficult.

  In addition, since the transmission method is a modulation method, a communication speed, a data format, and an encryption method, it is difficult to intercept and decrypt the transmission data D.

  Further, the identification information d3 for identifying the transmission method is included in the header portion D1 of the transmission data D, and on the vehicle side (on-vehicle unit 7 side), based on the identification information d3 included in the header portion D1 of the transmission data D. Since the reception method is changed, the reception method can be changed in correspondence with the transmission method by a simple method on the vehicle side (on-vehicle unit 7 side).

  In addition, since the header part D1 of the transmission data D is pre-transmission-processed by a fixed transmission method every time, the header part D1 can be processed after reception without depending on the identification information d3 included in the header part D1, Thus, even if the transmission part identification information d3 is included in the header part D1, the identification information d3 can be appropriately extracted from the header part D1 on the vehicle side (on-vehicle unit 7 side).

  Further, since the in-vehicle device 5 is a door locking / unlocking device that locks / unlocks the door of the car, it is possible to prevent the transmission data D from being intercepted and the door of the car being illegally locked / unlocked.

  In this embodiment, the modulation method, the communication speed, the data format, and the encryption method are specifically targeted as the transmission method. However, not all of these may be targeted, and one or more combinations of these may be targeted. Good.

1 is a schematic configuration diagram of a vehicle radio control system according to an embodiment of the present invention. It is a figure explaining the structure of the transmission data of the vehicle radio | wireless control system which concerns on embodiment of this invention. It is a structure schematic diagram of the conventional vehicle radio control system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle radio control system 3 Key 3b Control part (1st change means, control means)
3c Pre-transmission processing means 3d Transmission high-frequency unit 5 Door locking / unlocking device 7 On-vehicle unit 7a Reception high-frequency unit 7b Post-reception processing unit 7c Control unit (second changing unit, control unit)
D Transmission data D1 Header part D2 Real data part d1 Preamble d2 Synchronization signal d3 Identification information

Claims (6)

A vehicle radio control system for controlling an in-vehicle device of a predetermined car by transmission data from a portable radio device,
On the portable radio side,
First changing means for changing and specifying a transmission method for each transmission of the transmission data;
Pre-transmission processing means for pre-transmission processing of the transmission data by the transmission method designated by the first changing means;
Transmission means for transmitting the transmission data preprocessed by the transmission preprocessing means,
On the car side,
Receiving means for receiving the transmission data;
Second changing means for changing and specifying a receiving method in correspondence with the transmission method of the transmission data received by the receiving means;
Post-reception processing means for performing post-reception processing on the transmission data received by the reception means by the reception method specified by the second change means;
A vehicle radio control system comprising: control means for controlling the in-vehicle device based on the transmission data processed after reception by the post-reception processing means.   The vehicle radio control system according to claim 1, wherein the transmission method is a modulation method, a communication speed, a data format, and / or an encryption method. The transmission data has a header part, and identification information for identifying a transmission method of the transmission data is included in the header part,
3. The vehicle radio control system according to claim 1, wherein the second changing unit changes and specifies a reception method based on the identification information included in a header portion of the transmission data. The transmission data consists of a header part and a real data part,
For each transmission of the transmission data, the transmission preprocessing means performs pre-transmission processing on the header portion of the transmission data each time using a fixed transmission method and the first data for the actual data portion of the transmission data. Pre-transmission processing with the transmission method specified by the change means,
The reception post-processing means performs post-reception processing on the header portion of the transmission data by a fixed reception method every time the transmission data is received, and the second portion for the actual data portion of the transmission data. 4. The vehicle radio control system according to claim 3, wherein post-reception processing is performed by a reception method designated by the changing means.   5. The first change unit according to claim 1, wherein the first changing unit specifies to change the transmission method according to a predetermined order, or generates a random number and specifies to change according to the random number. The vehicle radio control system described.   6. The vehicle radio control system according to claim 1, wherein the in-vehicle device is a door locking / unlocking device that locks / unlocks the door of the vehicle.

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